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333\n",{"_205":328,"_207":329,"_209":226},752214,"view",{"_205":328,"_207":329,"_209":235},{"_205":328,"_207":329,"_209":244},{"_205":328,"_207":329,"_209":252},{"_205":328,"_207":329,"_209":260},{"_205":328,"_207":329,"_209":132},{"_205":328,"_207":329,"_209":31},{"_205":337,"_207":329,"_209":31},731578,"github.com",[340,341,342,343,344,345,346,347,348,349,350,351,352,353,354,355,356,357,358,359,360,361,362,363,364,365,366,367,368,369,370,371,372,373],{"_186":193,"_194":412,"_196":464,"_198":465,"_200":466,"_202":-5,"_204":338},{"_186":193,"_194":454,"_196":455,"_198":456,"_200":463,"_202":-5,"_204":338},{"_186":193,"_194":416,"_196":417,"_198":418,"_200":461,"_202":-5,"_204":338},{"_186":193,"_194":454,"_196":455,"_198":456,"_200":460,"_202":-5,"_204":338},{"_186":193,"_194":454,"_196":455,"_198":456,"_200":459,"_202":-5,"_204":338},{"_186":193,"_194":454,"_196":455,"_198":456,"_200":458,"_202":-5,"_204":338},{"_186":193,"_194":454,"_196":455,"_198":456,"_200":457,"_202":-5,"_204":338},{"_186":193,"_194":416,"_196":417,"_198":418,"_200":453,"_202":-5,"_204":338},{"_186":193,"_194":416,"_196":417,"_198":418,"_200":452,"_202":-5,"_204":338},{"_186":193,"_194":416,"_196":417,"_198":418,"_200":450,"_202":-5,"_204":338},{"_186":193,"_194":446,"_196":447,"_198":448,"_200":449,"_202":-5,"_204":338},{"_186":193,"_194":443,"_196":444,"_198":436,"_200":445,"_202":-5,"_204":338},{"_186":193,"_194":439,"_196":440,"_198":441,"_200":442,"_202":-5,"_204":338},{"_186":193,"_194":434,"_196":435,"_198":436,"_200":437,"_202":-5,"_204":338},{"_186":193,"_194":421,"_196":422,"_198":423,"_200":432,"_202":-5,"_204":338},{"_186":193,"_194":421,"_196":422,"_198":423,"_200":431,"_202":-5,"_204":338},{"_186":193,"_194":421,"_196":422,"_198":423,"_200":430,"_202":-5,"_204":338},{"_186":193,"_194":421,"_196":422,"_198":423,"_200":429,"_202":-5,"_204":338},{"_186":193,"_194":421,"_196":422,"_198":423,"_200":428,"_202":-5,"_204":338},{"_186":193,"_194":421,"_196":422,"_198":423,"_200":427,"_202":-5,"_204":338},{"_186":193,"_194":421,"_196":422,"_198":423,"_200":426,"_202":-5,"_204":338},{"_186":193,"_194":421,"_196":422,"_198":423,"_200":424,"_202":-5,"_204":338},{"_186":193,"_194":416,"_196":417,"_198":418,"_200":419,"_202":-5,"_204":338},{"_186":193,"_194":412,"_196":413,"_198":414,"_200":415,"_202":-5,"_204":338},{"_186":193,"_194":409,"_196":410,"_198":397,"_200":411,"_202":-5,"_204":338},{"_186":193,"_194":405,"_196":406,"_198":407,"_200":408,"_202":-5,"_204":338},{"_186":193,"_194":402,"_196":403,"_198":397,"_200":404,"_202":-5,"_204":338},{"_186":193,"_194":399,"_196":400,"_198":397,"_200":401,"_202":-5,"_204":338},{"_186":193,"_194":395,"_196":396,"_198":397,"_200":398,"_202":-5,"_204":338},{"_186":193,"_194":390,"_196":391,"_198":392,"_200":393,"_202":394,"_204":338},{"_186":193,"_194":385,"_196":386,"_198":387,"_200":388,"_202":389,"_204":338},{"_186":193,"_194":382,"_196":383,"_198":376,"_200":384,"_202":-5,"_204":338},{"_186":193,"_194":379,"_196":380,"_198":376,"_200":381,"_202":-5,"_204":338},{"_186":193,"_194":374,"_196":375,"_198":376,"_200":377,"_202":-5,"_204":338},"https://github.com/pleriche/FastMM5/tree/fd1d4899478b10b6fa113d47fc900112563523ef/Demos","FastMM5/Demos at fd1d4899478b10b6fa113d47fc900112563523ef · pleriche/FastMM5 · GitHub","Total lines: 263\n",{"_205":378,"_207":329,"_209":260},414883,"https://github.com/pleriche/FastMM5/tree/fd1d4899478b10b6fa113d47fc900112563523ef/BorlndMM%20DLL","FastMM5/BorlndMM DLL at fd1d4899478b10b6fa113d47fc900112563523ef · pleriche/FastMM5 · GitHub",{"_205":378,"_207":329,"_209":132},"https://github.com/pleriche/FastMM5/tree/fd1d4899478b10b6fa113d47fc900112563523ef/FullDebugMode%20DLL","FastMM5/FullDebugMode DLL at fd1d4899478b10b6fa113d47fc900112563523ef · pleriche/FastMM5 · GitHub",{"_205":378,"_207":329,"_209":31},"https://github.com/pleriche/FastMM5/issues/39","Documentation ? · Issue #39 · pleriche/FastMM5","19 Sept 2023 — How to use FastMM5 in C++ Builder? Via the BorlndMM.dll library. I have added additional exports in order to allow the application to access the ...Read more",{"_205":310,"_207":208,"_209":218},1695131329,"https://github.com/pleriche/FastMM5/issues/47","FastMM5 and FireMonkey · Issue #47 · pleriche ...","16 Feb 2024 — Hallo, I have a simple FMX-projecz (Win32) and try to use FastMM5 but it doesn't report leaks. Under VCL all works fine.",{"_205":310,"_207":208,"_209":226},1708075236,"https://github.com/pleriche/FastMM5/issues","Issues · pleriche/FastMM5","FastMM is a fast replacement memory manager for Embarcadero Delphi applications that scales well across multiple threads and CPU cores, is not prone to ...",{"_205":310,"_207":208,"_209":235},"https://github.com/pleriche/FastMM5/blob/master/FullDebugMode%20DLL/FastMM_FullDebugMode.dpr","FastMM_FullDebugMode.dpr",{"_205":310,"_207":208,"_209":244},"https://github.com/pleriche/FastMM5/blob/master/FastMM5.pas","FastMM5/FastMM5.pas at master · pleriche/FastMM5",{"_205":310,"_207":208,"_209":252},"https://github.com/pleriche/FastMM5/releases","Releases · pleriche/FastMM5","29 Dec 2024 — FastMM is a fast replacement memory manager for Embarcadero Delphi applications that scales well across multiple threads and CPU cores, ...",{"_205":310,"_207":208,"_209":260},"https://github.com/pleriche/FastMM5/blob/master/Demos/Memory%20Manager%20Sharing/ShareMem/TestLibrary.dpr","TestLibrary.dpr",{"_205":310,"_207":208,"_209":132},"https://github.com/pleriche/FastMM5","pleriche/FastMM5","FastMM is a fast replacement memory manager for Embarcadero Delphi applications that scales well across multiple threads and CPU cores.Read more",{"_205":310,"_207":208,"_209":31},"https://github.com/pleriche/FastMM5/issues/69","Question: interest in additional reproducible fixes from GPT-assisted review? · Issue #69 · pleriche/FastMM5 · GitHub","Total lines: 282\n",{"_205":420,"_207":329,"_209":31},602970,"https://github.com/pleriche/FastMM5/blob/fd1d4899478b10b6fa113d47fc900112563523ef/FastMM5.pas","FastMM5/FastMM5.pas at fd1d4899478b10b6fa113d47fc900112563523ef · pleriche/FastMM5 · GitHub","Total lines: 3863\n",{"_205":425,"_207":329,"_209":226},921522,{"_205":425,"_207":329,"_209":235},{"_205":425,"_207":329,"_209":244},{"_205":425,"_207":329,"_209":252},{"_205":425,"_207":329,"_209":260},{"_205":425,"_207":329,"_209":132},{"_205":425,"_207":329,"_209":31},{"_205":433,"_207":329,"_209":31},973468,"https://github.com/pleriche/FastMM5/commit/7502679fde48886084bf64ea7a5bcbb370d84e32","Fix the UTF-16 to UTF-8 conversion of surrogate pair characters. (Tha… · pleriche/FastMM5@7502679 · GitHub","Total lines: 286\n",{"_205":438,"_207":329,"_209":252},949241,"https://github.com/pleriche/FastMM5/commit/1dad84bd8fd694e0a3725625086d1cc099e67ba0","Fix a potential A/V (instead of an EOutOfMemory exception) in debug m… · pleriche/FastMM5@1dad84b · GitHub","Total lines: 284\n",{"_205":438,"_207":329,"_209":260},"https://github.com/pleriche/FastMM5/commit/88e58e3311def59c52e7bb51b45648aa8ead7d5f","Fix a potential failure of AllocMem to actually zero-fill the returne… · pleriche/FastMM5@88e58e3 · GitHub",{"_205":438,"_207":329,"_209":132},"https://github.com/pleriche/FastMM5/commit/fd1d4899478b10b6fa113d47fc900112563523ef","Add thread safety to the event log text file. (Thanks to Jan Ryšavý.) · pleriche/FastMM5@fd1d489 · GitHub","Total lines: 1178\n",{"_205":438,"_207":329,"_209":31},{"_205":451,"_207":329,"_209":226},459258,{"_205":451,"_207":329,"_209":235},{"_205":451,"_207":329,"_209":244},"https://github.com/pleriche/FastMM5/commits/master","Commits · pleriche/FastMM5 · GitHub","Total lines: 663\n",{"_205":451,"_207":329,"_209":252},{"_205":451,"_207":329,"_209":260},{"_205":451,"_207":329,"_209":132},{"_205":451,"_207":329,"_209":31},{"_205":462,"_207":329,"_209":260},729783,{"_205":462,"_207":329,"_209":132},"GitHub - pleriche/FastMM5: FastMM is a fast replacement memory manager for Embarcadero Delphi applications that scales well across multiple threads and CPU cores, is not prone to memory fragmentation, and supports shared memory without the use of external .DLL files. · GitHub","Total lines: 445\n",{"_205":462,"_207":329,"_209":31},{"_475":567,"_488":-5,"_477":568,"_479":569,"_141":570,"_492":571,"_480":572,"_495":-5,"_186":496,"_497":573,"_499":-5,"_128":500,"_501":-5,"_502":-5},{"_475":556,"_488":-5,"_477":557,"_479":558,"_141":559,"_492":560,"_480":561,"_495":-5,"_186":496,"_497":562,"_499":-5,"_128":500,"_501":-5,"_502":-5},{"_475":487,"_488":-5,"_477":547,"_479":548,"_141":549,"_492":550,"_480":494,"_495":-5,"_186":496,"_497":551,"_499":-5,"_128":500,"_501":-5,"_502":-5},{"_475":487,"_488":-5,"_477":538,"_479":539,"_141":540,"_492":541,"_480":494,"_495":-5,"_186":496,"_497":542,"_499":-5,"_128":500,"_501":-5,"_502":-5},{"_475":525,"_488":-5,"_477":526,"_479":527,"_141":528,"_492":529,"_480":530,"_495":-5,"_186":496,"_497":531,"_499":-5,"_128":500,"_501":-5,"_502":-5},{"_475":511,"_488":-5,"_477":512,"_479":513,"_141":514,"_492":515,"_480":516,"_495":-5,"_186":496,"_497":517,"_499":-5,"_128":500,"_501":-5,"_502":-5},{"_475":487,"_488":-5,"_477":489,"_479":490,"_141":491,"_492":493,"_480":494,"_495":-5,"_186":496,"_497":498,"_499":-5,"_128":500,"_501":-5,"_502":-5},{"_475":476,"_477":478,"_479":478,"_480":286,"_186":481,"_482":483,"_484":15},"matched_text"," ","start_idx",45760,"end_idx","alt","sources_footnote","sources",[485],"has_images",{"_196":416,"_194":416,"_204":486},"GitHub","citeturn729783view0","prefix",40523,40545,[412],"refs",[],"([GitHub](https://github.com/pleriche/FastMM5))","prompt_text","grouped_webpages","items",[503],"fallback_items","done","error","style",{"_196":412,"_194":412,"_204":486,"_202":-5,"_198":-5,"_504":-5,"_505":506,"_492":507,"_508":-5,"_509":-5},"attribution_segments","supporting_websites",[],[510],"hue","attributions",{"_205":31,"_207":329,"_209":31},"citeturn414883view0turn414883view1",39903,39941,[379,382],[],"([GitHub](https://github.com/pleriche/FastMM5/tree/fd1d4899478b10b6fa113d47fc900112563523ef/FullDebugMode%20DLL))",[518],{"_196":382,"_194":382,"_204":486,"_202":-5,"_198":-5,"_504":-5,"_505":519,"_492":520,"_508":-5,"_509":-5},[524],[521,522],{"_205":523,"_207":329,"_209":31},{"_205":523,"_207":329,"_209":132},13,{"_196":379,"_194":379,"_202":-5,"_198":-5,"_204":486},"citeturn459258view0turn949241view0",2088,2126,[446,454],[],"([GitHub](https://github.com/pleriche/FastMM5/commits/master))",[532],{"_196":454,"_194":454,"_204":486,"_202":-5,"_198":-5,"_504":-5,"_505":533,"_492":534,"_508":-5,"_509":-5},[537],[535,536],{"_205":132,"_207":329,"_209":31},{"_205":260,"_207":329,"_209":31},{"_196":446,"_194":446,"_202":-5,"_198":-5,"_204":486},1771,1793,[412],[],[543],{"_196":412,"_194":412,"_204":486,"_202":-5,"_198":-5,"_504":-5,"_505":544,"_492":545,"_508":-5,"_509":-5},[],[546],{"_205":31,"_207":329,"_209":31},1497,1519,[412],[],[552],{"_196":412,"_194":412,"_204":486,"_202":-5,"_198":-5,"_504":-5,"_505":553,"_492":554,"_508":-5,"_509":-5},[],[555],{"_205":31,"_207":329,"_209":31},"citeturn973468view0",997,1019,[421],[],"([GitHub](https://github.com/pleriche/FastMM5/blob/fd1d4899478b10b6fa113d47fc900112563523ef/FastMM5.pas))",[563],{"_196":421,"_194":421,"_204":486,"_202":-5,"_198":-5,"_504":-5,"_505":564,"_492":565,"_508":-5,"_509":-5},[],[566],{"_205":244,"_207":329,"_209":31},"citeturn602970view0",541,563,[416],[],"([GitHub](https://github.com/pleriche/FastMM5/issues/69))",[574],{"_196":416,"_194":416,"_204":486,"_202":-5,"_198":-5,"_504":-5,"_505":575,"_492":576,"_508":-5,"_509":-5},[],[577],{"_205":305,"_207":329,"_209":31},"content_type","parts",[581],"# Review facts\n\nReviewed repository: `pleriche/FastMM5`.\n\nReviewed branch: `master`.\n\nReviewed current HEAD: `fd1d4899478b10b6fa113d47fc900112563523ef`.\n\nReview date/time: April 28, 2026, approximately 09:22 CDT / America-Chicago.\n\nAuthor note considered: issue #69 says the author fixed the UTF-8 issue and added thread safety for the event log, and notes that `FastMM_WalkBlocks` and `FastMM_CurrentAllocationGroup` concerns are by design. The issue also references PRs/fixes for debug `AllocMem` zero-fill and debug size overflow checks. citeturn602970view0\n\nTooling/access method:\n- GitHub web UI and raw-source access.\n- Downloaded current `FastMM5.pas` for local static inspection.\n- Local tools: `grep`, `sed`, `nl`, `wc`, `sha256sum`, manual code tracing.\n- Current downloaded file: `FastMM5.pas`, 11,074 lines, SHA-256 `01e6ead40c2c49bddbf3c0d64bdb40c75838b927b5963c20e438856a7e5b80b5`.\n- GitHub’s current blob page also shows `FastMM5.pas` at commit `fd1d489`, 11,074 lines / 429 KB. citeturn973468view0\n\nFull repository availability: partially. I could inspect the GitHub root, `FastMM5.pas`, README-visible metadata, and top-level DLL/demo directories via GitHub. I could not obtain a full local clone: `git clone` failed in the container due DNS resolution failure for `github.com`, and I was not able to download the full archive locally. The repository root visibly contains `FastMM5.pas`, `README.md`, `Demos`, `BorlndMM DLL`, `FullDebugMode DLL`, and related folders/files. citeturn729783view0\n\nBuild/test status: I was not able to build or run Delphi/Windows tests. This is a static audit only. The README states the supported compiler/platform scope as Delphi XE3+ on Windows 32-bit and 64-bit; I did not have that toolchain in the container. citeturn729783view0\n\nImportant HEAD delta since the previous review: the current commit history shows the Apr 28, 2026 fixes for debug `AllocMem`, debug `ReallocMem` near `Max(NativeInt)`, UTF-8 surrogate-pair conversion, and event-log thread safety; the current HEAD commit is the event-log thread-safety commit. citeturn459258view0turn949241view0\n\nBottom line: the author’s fixes did address the previously reported debug `AllocMem` header bug, the `Max(NativeInt)` debug `ReallocMem` in-place overflow path, the UTF-8 four-byte prefix bug, and the main `LogEvent` event-log handle race. I still found three concrete residual issues, two in diagnostic/debug modes and one incompleteness in the event-log locking change.\n\n---\n\n# Findings\n\n## Finding 1: `FastMM_FreeMem_EraseBeforeFree` overwrites allocator free-list metadata before validating that the block is still allocated\n\nSeverity: High.\n\nConfidence: Confirmed.\n\nAffected files/functions:\n`FastMM5.pas`\n\nRelevant functions/lines from current HEAD:\n\n```pascal\n7936 function FastMM_FreeMem_EraseBeforeFree(APointer: Pointer): Integer;\n7937 begin\n7938 if APointer <> nil then\n7939 FillChar(APointer^, FastMM_BlockMaximumUserBytes(APointer), CDebugFillByteFreedBlock);\n7940\n7941 Result := FastMM_FreeMem(APointer);\n7942 end;\n```\n\nInstalled by erase-freed mode:\n\n```pascal\n10583 if EraseFreedBlockContentCounter <= 0 then\n10584 LMemoryManager.FreeMem := FastMM_FreeMem\n10585 else\n10586 LMemoryManager.FreeMem := FastMM_FreeMem_EraseBeforeFree;\n```\n\nEnabled via:\n\n```pascal\n10822 procedure FastMM_BeginEraseFreedBlockContent;\n10824 AtomicIncrement(EraseFreedBlockContentCounter);\n10825 FastMM_SetNormalOrDebugMemoryManager;\n10826 end;\n```\n\n`FastMM_BlockMaximumUserBytes` accepts a pointer and derives the block size from the block header, but does not require the block to be currently allocated. Small-block free-list metadata is stored in the user area of freed blocks:\n\n```pascal\n6571 {Frees a small block. The first pointer inside the block will be set to the\n6572 current first free block of the span.}\n...\n6659 SetBlockIsFreeFlag(APSmallBlock);\n6662 PPointer(APSmallBlock)^ := LOldFirstFreeBlock;\n6663 APSmallBlockManager.FirstFreeBlock := APSmallBlock;\n```\n\nBug category:\nAllocator metadata corruption in diagnostic erase-freed-content mode; invalid-free hardening failure; double-free corruption.\n\nDetailed description:\n`FastMM_FreeMem_EraseBeforeFree` writes the freed-pattern bytes into the block’s user area before calling the real `FastMM_FreeMem`.\n\nThat is safe only if `APointer` currently points to a live allocated block. It is unsafe if the pointer is already freed.\n\nFor small blocks, a freed block’s first pointer-sized word is no longer user data. It is allocator metadata: the next pointer in the small-block free list. On a double free under erase-freed mode, the wrapper executes first and overwrites that next pointer with `$80808080...` before the real free path gets a chance to detect/report the invalid free. The allocator’s internal free list is already poisoned.\n\nThe intended invariant is: once a block has been freed, the allocator owns the user area for free-list metadata. Diagnostic fill code must not write into a block unless the allocator has first established that the block is currently allocated.\n\nExecution scenario:\nSingle thread is sufficient.\n\nThread A:\n1. Calls `FastMM_BeginEraseFreedBlockContent`.\n2. Allocates a small block: `P := GetMemory(64)`.\n3. Frees it: `FreeMemory(P)`.\n4. The erase wrapper fills the live block, then real `FastMM_FreeMem` frees it.\n5. The small-block free path marks the block free and writes the free-list next pointer into `PPointer(P)^`.\n6. Bug trigger: `FreeMemory(P)` again.\n7. `FastMM_FreeMem_EraseBeforeFree` runs before validation.\n8. It calls `FastMM_BlockMaximumUserBytes(P)` and then `FillChar(P^, ..., $80)`.\n9. This overwrites `PPointer(P)^`, the free-list link.\n10. Only after that does `FastMM_FreeMem(P)` run and attempt to detect/report the invalid free.\n11. The free-list is already corrupt.\n12. A later allocation from the same size class may load `$8080808080808080` as the next free-block pointer, causing access violation, invalid pointer use, or further heap corruption.\n\nWhy existing code does not prevent it:\nThe wrapper does not check `CBlockIsFreeFlag` or any other “currently allocated” state before filling. The real `FastMM_FreeMem` validation happens too late. Small-block free-list metadata intentionally lives in the user area of freed blocks, so overwriting the user area of an already freed block is allocator metadata corruption, not harmless debug fill.\n\nImpact:\nA double free under `FastMM_BeginEraseFreedBlockContent` can corrupt the allocator before the allocator reports the double free. This is especially bad because erase-freed mode is a diagnostic/safety mode; it should make use-after-free easier to catch, not turn an invalid second free into free-list poisoning.\n\nPossible user-visible effects:\n- Access violation on a later allocation of the same small size.\n- Heap metadata corruption.\n- Misleading invalid pointer reports after the true fault site.\n- Rare production-only failure if erase-freed mode is enabled in a diagnostic build.\n- Corruption that survives the double-free diagnostic path.\n\nReproduction test:\n\nTest goal:\nShow that a double free in erase-freed-content mode corrupts the small-block free list before invalid-free handling.\n\nRequired platform/compiler/configuration:\nWindows, Delphi XE3+, FastMM5 current HEAD, normal mode with `FastMM_BeginEraseFreedBlockContent`.\n\nMinimal Delphi/Object Pascal test program:\n\n```pascal\nprogram EraseFreedDoubleFreeCorruptsFreeList;\n\n{$APPTYPE CONSOLE}\n\nuses\n System.SysUtils,\n FastMM5;\n\nconst\n Size = 64;\n\nvar\n P, A, B: Pointer;\n\nbegin\n FastMM_BeginEraseFreedBlockContent;\n try\n P := GetMemory(Size);\n if P = nil then\n raise Exception.Create('Initial allocation failed');\n\n FreeMemory(P);\n\n try\n // This is intentionally invalid. The bug is that the erase wrapper\n // corrupts allocator metadata before FastMM_FreeMem can diagnose it.\n FreeMemory(P);\n Writeln('Second free returned without exception');\n except\n on E: Exception do\n Writeln('Second free raised: ', E.ClassName, ': ', E.Message);\n end;\n\n // These allocations are likely to reuse the corrupted free-list path.\n A := GetMemory(Size);\n B := GetMemory(Size);\n\n Writeln('A=', NativeUInt(A), ' B=', NativeUInt(B));\n\n if A <> nil then\n FreeMemory(A);\n if B <> nil then\n FreeMemory(B);\n finally\n FastMM_EndEraseFreedBlockContent;\n end;\nend.\n```\n\nThread count:\nSingle-threaded.\n\nAllocation/free/realloc pattern:\nAllocate one small block, free it, double-free it, then allocate same-size blocks again.\n\nSynchronization barriers:\nNone required.\n\nExpected failure mode:\nDepending on exact small-block span/free-list state, the second or later allocation may crash, return an invalid pointer, trigger a FastMM invalid pointer event, or corrupt internal state. The deterministic evidence is that the second free overwrites `PPointer(P)^`, which is allocator free-list metadata after the first free.\n\nHow to detect failure:\n- Run under debugger and break on AV / FastMM invalid pointer event.\n- Instrument the small-block free-list next pointer before and after the second free; it changes to the freed fill pattern before the real free path validates the pointer.\n- Loop the test thousands of times if the immediate crash does not occur due size-class state.\n\nRun mode:\nRun once with instrumentation; otherwise run as a stress loop.\n\nDebug/full-debug options:\nNot necessary. This is normal erase-freed-content mode, not debug mode.\n\nProposed fix:\nDo not fill until the block is known to be an allocated block. The minimal fix is to validate the block header before `FillChar` and delegate invalid or already-free pointers to `FastMM_FreeMem` without touching memory.\n\nPatch sketch:\n\n```pascal\nfunction FastMM_FreeMem_EraseBeforeFree(APointer: Pointer): Integer;\nvar\n LBlockStatus: Word;\nbegin\n if APointer <> nil then\n begin\n LBlockStatus := PBlockStatusFlags(APointer)[-1];\n\n {Do not write into the user area of an already freed block. In a freed\n small block the user area contains allocator free-list metadata.}\n if (LBlockStatus and CBlockIsFreeFlag) = 0 then\n begin\n {Optional stronger validation: only fill recognized allocated block types.\n Otherwise let the real FreeMem path report invalid pointers unchanged.}\n if ((LBlockStatus and CIsSmallBlockFlag) <> 0)\n or ((LBlockStatus and (not CHasDebugInfoFlag)) = CIsMediumBlockFlag)\n or ((LBlockStatus and (not CHasDebugInfoFlag)) = CIsLargeBlockFlag)\n or (LBlockStatus = CIsDebugBlockFlag) then\n begin\n FillChar(APointer^, FastMM_BlockMaximumUserBytes(APointer), CDebugFillByteFreedBlock);\n end;\n end;\n end;\n\n Result := FastMM_FreeMem(APointer);\nend;\n```\n\nBetter fix:\nMove erase-before-free into the validated per-type free paths:\n- Validate that the pointer belongs to a live allocated small/medium/large/debug block.\n- Fill only after validation and before metadata transition.\n- For small and medium blocks, do this while following the same manager-lock discipline as normal free.\n- Never fill blocks already marked free or pending-free.\n\nWhy the fix is correct:\nIt preserves the invariant that user-area debug filling only occurs while the block is still user-owned. Freed blocks remain allocator-owned and their embedded links are not touched.\n\nFast path performance:\nOnly affects erase-freed diagnostic mode. Normal allocator performance is unchanged.\n\nPublic behavior/compatibility:\nInvalid double-free diagnostics become safer. Correct user code sees no behavior change except possibly slightly different timing of fill relative to metadata transitions.\n\nAlternative fixes and tradeoffs:\n- Minimal header check in wrapper: low-risk and quick, but still duplicates classification logic.\n- Integrated per-type fill: more invasive, but best correctness because the real free path already knows the block type and lock state.\n\nNew assertions/invariants:\nAdd an assertion before diagnostic fill:\n\n```pascal\nAssert((PBlockStatusFlags(APointer)[-1] and CBlockIsFreeFlag) = 0);\n```\n\nRegression tests:\n- Double-free small block with erase-freed mode enabled.\n- Double-free medium block with erase-freed mode enabled.\n- Double-free large block with erase-freed mode enabled.\n- Invalid pointer free with erase-freed mode enabled.\n- Cross-thread double-free stress where one thread frees and another erroneously frees again.\n\nRisk of fix:\nLow for the minimal guard. The more invasive integrated free-path fix has medium risk because it touches allocator hot paths, although only diagnostic mode behavior should change.\n\n---\n\n## Finding 2: Debug-mode allocation paths still accept negative sizes and can corrupt debug metadata\n\nSeverity: High if debug/full-debug mode is expected to harden invalid API calls; otherwise Medium.\n\nConfidence: Confirmed.\n\nAffected files/functions:\n`FastMM5.pas`\n\nRelevant functions/lines from current HEAD:\n\n```pascal\n8052 function FastMM_DebugGetMem_GetDebugBlock(ASize: NativeInt; AFillBlockWithDebugPattern: Boolean): Pointer;\n8056 LStackTraceDepth := DebugMode_StackTrace_EntryCount;\n8058 {Allocate the block with space for the header and footer}\n8059 Result := FastMM_GetMem(ASize + CDebugBlockHeaderSize + CalculateDebugBlockFooterSize(LStackTraceDepth));\n...\n8064 PFastMM_DebugBlockHeader(Result).UserSize := ASize;\n...\n8082 if AFillBlockWithDebugPattern then\n8083 FillAllocatedDebugBlockWithDebugPattern(Result);\n```\n\nFooter pointer derives from signed `UserSize`:\n\n```pascal\n1797 function TFastMM_DebugBlockHeader.DebugFooterPtr: PFastMM_DebugBlockFooter;\n1799 begin\n1800 Result := @PByte(@Self)[UserSize + CDebugBlockHeaderSize];\n1801 end;\n```\n\nDebug fill uses `UserSize` as a byte count/offset:\n\n```pascal\n4218 procedure FillAllocatedDebugBlockWithDebugPattern(APDebugBlockHeader: PFastMM_DebugBlockHeader);\n...\n4223 LByteOffset := APDebugBlockHeader.UserSize;\n...\n4242 Dec(LByteOffset, 2);\n4243 PWord(@LPUserArea[LByteOffset])^ := CWordDebugFillPattern;\n...\n4251 LPUserArea[0] := CDebugFillByteAllocatedBlock;\n```\n\nDebug `ReallocMem` current in-place condition was improved for large positive overflow, but negative sizes still pass:\n\n```pascal\n4512 LAvailableSpace := FastMM_BlockMaximumUserBytes(LPActualBlock);\n4513 LDebugFooterSize := CalculateDebugBlockFooterSize(LPActualBlock.StackTraceEntryCount);\n4514 if (LAvailableSpace - CDebugBlockHeaderSize - LDebugFooterSize) >= ANewSize then\n...\n4526 LPActualBlock.UserSize := ANewSize;\n...\n4529 LPNewFooter := LPActualBlock.DebugFooterPtr;\n4530 System.Move(LPOldFooter^, LPNewFooter^, LDebugFooterSize);\n```\n\nBug category:\nSigned-size validation bug; debug metadata corruption; invalid `GetMem`/`AllocMem`/`ReallocMem` handling.\n\nDetailed description:\nThe recent `ReallocMem(Max(NativeInt))` fix changed the in-place check from an overflowing addition to a subtraction-based check. That addresses a real large-positive overflow path. It does not address negative sizes.\n\n`NativeInt` allocation sizes can be negative at the API boundary. A robust allocator should reject negative sizes or delegate them to the normal allocator behavior without creating a debug block whose `UserSize` is negative.\n\nCurrent debug mode does this:\n\n```pascal\nFastMM_GetMem(ASize + debug_overhead)\n```\n\nFor `ASize = -1`, the requested actual size becomes a small positive allocation. The block is allocated, then the debug header records `UserSize := -1`. Debug footer placement and debug fill logic then use the negative size to compute addresses before the intended user area.\n\nFor `ReallocMem(P, -1)` on an existing debug block, the current in-place test is trivially true because any non-negative available space is `>= -1`. The code updates `UserSize` to a negative value and moves the footer to an address derived from that negative size.\n\nThe intended invariant is: every debug block must have `UserSize >= 0`, and the debug footer must lie after the user area and inside the real allocated block. Current HEAD still violates this invariant for negative sizes.\n\nExecution scenario A: negative debug `GetMem`\n\nThread A:\n1. Calls `FastMM_EnterDebugMode`.\n2. Calls `GetMem(-1)` or `FastMM_DebugGetMem(-1)`.\n3. `FastMM_DebugGetMem_GetDebugBlock` computes a small positive internal allocation size.\n4. Normal allocator returns a valid internal block.\n5. Debug header stores `UserSize := -1`.\n6. `DebugFooterPtr` points before the expected footer location.\n7. Fill/checksum/footer code writes based on the negative size.\n8. Later scan/free/realloc sees corrupted debug metadata or raises an AV.\n\nExecution scenario B: negative debug `ReallocMem`\n\nThread A:\n1. Calls `FastMM_EnterDebugMode`.\n2. Allocates `P := GetMemory(32)`.\n3. Calls `ReallocMemory(P, -1)`.\n4. In `FastMM_ReallocMem_ReallocDebugBlock`, line 4514 evaluates true because the right-hand side is negative.\n5. The existing debug block is modified in place.\n6. `UserSize := -1`.\n7. `LPNewFooter := LPActualBlock.DebugFooterPtr` points before the correct footer region.\n8. `System.Move` copies footer data into the wrong location.\n9. The old valid block has now been corrupted by a failed/invalid resize request.\n\nWhy existing code does not prevent it:\nThere is no shared checked helper for “user size + debug overhead”. The current fix handles one positive overflow scenario in `FastMM_ReallocMem_ReallocDebugBlock`, but `FastMM_DebugGetMem_GetDebugBlock` still performs unchecked signed addition and no `ASize < 0` test. `FastMM_ReallocMem_ReallocDebugBlock` also does no `ANewSize < 0` test before modifying the existing block.\n\nImpact:\nDebug/full-debug mode can corrupt its own metadata for invalid negative allocation sizes. This undermines the diagnostic mode most users rely on for memory corruption investigation.\n\nPossible user-visible effects:\n- Access violation in debug allocation/free/realloc.\n- False memory corruption reports.\n- Silent corruption of debug headers/footers.\n- Old block corrupted by an invalid `ReallocMem` request that should have failed without modifying it.\n\nReproduction test:\n\nTest goal:\nShow that negative sizes are not rejected before debug metadata is created/modified.\n\nRequired platform/compiler/configuration:\nWindows, Delphi XE3+, current FastMM5, debug mode enabled.\n\nMinimal Delphi/Object Pascal test program:\n\n```pascal\nprogram DebugNegativeSizeStillCorrupts;\n\n{$APPTYPE CONSOLE}\n\nuses\n System.SysUtils,\n FastMM5;\n\nvar\n P, Q: Pointer;\n\nbegin\n FastMM_EnterDebugMode;\n try\n P := FastMM_DebugGetMem(-1);\n\n if P <> nil then\n begin\n Writeln('BUG: negative debug GetMem returned non-nil');\n\n try\n FastMM_ScanDebugBlocksForCorruption(1000);\n except\n on E: Exception do\n Writeln('Corruption detected after GetMem(-1): ', E.ClassName, ': ', E.Message);\n end;\n\n try\n FastMM_DebugFreeMem(P);\n except\n on E: Exception do\n Writeln('Free of negative-size debug block raised: ', E.ClassName, ': ', E.Message);\n end;\n end\n else\n Writeln('OK: negative debug GetMem rejected');\n\n Q := GetMemory(32);\n if Q = nil then\n raise Exception.Create('Initial debug allocation failed');\n\n try\n P := ReallocMemory(Q, -1);\n\n if P <> nil then\n begin\n Writeln('BUG: negative debug ReallocMem returned non-nil');\n FreeMemory(P);\n end\n else\n begin\n Writeln('Negative ReallocMem returned nil; verifying old pointer still valid');\n FreeMemory(Q);\n end;\n except\n on E: Exception do\n Writeln('BUG likely reproduced by ReallocMem(-1): ', E.ClassName, ': ', E.Message);\n end;\n finally\n FastMM_ExitDebugMode;\n end;\nend.\n```\n\nThread count:\nSingle-threaded.\n\nAllocation/free/realloc pattern:\nOne negative debug allocation; one valid debug allocation followed by negative reallocation.\n\nSynchronization barriers:\nNone.\n\nExpected failure mode:\nCurrent code can return a non-nil pointer for `GetMem(-1)` in debug mode, corrupt debug metadata, raise AV, or report corruption during scan/free. `ReallocMem(P, -1)` can corrupt the existing block before failing or reporting.\n\nHow to detect failure:\n- Assert that all negative-size allocation APIs return nil/failure.\n- Assert that an old block remains valid after invalid negative `ReallocMem`.\n- Run `FastMM_ScanDebugBlocksForCorruption`.\n\nRun mode:\nSingle deterministic test plus boundary-size regression suite.\n\nDebug/full-debug options:\n`FastMM_EnterDebugMode` required. Full-debug support DLL optional.\n\nProposed fix:\nAdd a single checked debug-size helper and use it everywhere debug overhead is added or compared.\n\nPatch sketch:\n\n```pascal\nfunction TryCalculateDebugActualSize(AUserSize: NativeInt;\n AStackTraceDepth: Byte; out AActualSize: NativeInt): Boolean; inline;\nvar\n LOverhead: NativeInt;\nbegin\n if AUserSize < 0 then\n Exit(False);\n\n LOverhead := CDebugBlockHeaderSize + CalculateDebugBlockFooterSize(AStackTraceDepth);\n\n if AUserSize > High(NativeInt) - LOverhead then\n Exit(False);\n\n AActualSize := AUserSize + LOverhead;\n Result := True;\nend;\n```\n\nUse in `FastMM_DebugGetMem_GetDebugBlock`:\n\n```pascal\nif not TryCalculateDebugActualSize(ASize, LStackTraceDepth, LActualSize) then\n Exit(nil);\n\nResult := FastMM_GetMem(LActualSize);\n```\n\nUse in `FastMM_ReallocMem_ReallocDebugBlock` before modifying the old block:\n\n```pascal\nif not TryCalculateDebugActualSize(ANewSize,\n LPActualBlock.StackTraceEntryCount, LNewActualSize) then\n Exit(nil);\n\nif LAvailableSpace >= LNewActualSize then\nbegin\n ...\nend\nelse\nbegin\n Result := FastMM_GetMem(LNewActualSize);\n ...\nend;\n```\n\nAlso guard `FastMM_DebugAllocMem` and non-debug-to-debug `FastMM_DebugReallocMem` paths so `FillChar` and `System.Move` are never called with a negative count derived from the user request.\n\nWhy the fix is correct:\nIt restores the invariant that debug `UserSize` is non-negative and representable with debug overhead. It also preserves standard `ReallocMem` failure semantics: an invalid resize request must not corrupt the old block.\n\nFast path performance:\nOnly debug-mode paths are affected. The checks are negligible relative to stack capture, footer initialization, and corruption scanning.\n\nPublic behavior/compatibility:\nInvalid negative debug allocations now fail cleanly. Valid allocation behavior is unchanged.\n\nAlternative fixes and tradeoffs:\n- Add local `ASize < 0` and overflow checks at each call site. This is easier but error-prone.\n- A shared helper is preferable because debug header/footer overhead must be computed consistently.\n\nNew assertions/invariants:\nAdd assertions after debug block setup:\n\n```pascal\nAssert(PFastMM_DebugBlockHeader(Result).UserSize >= 0);\nAssert(NativeUInt(PFastMM_DebugBlockHeader(Result).DebugFooterPtr) >\n NativeUInt(Result));\n```\n\nRegression tests:\n- `FastMM_DebugGetMem(-1)`.\n- `FastMM_DebugAllocMem(-1)`.\n- `FastMM_DebugReallocMem(P, -1)`.\n- `FastMM_DebugReallocMem(P, High(NativeInt))`.\n- Boundary tests around `High(NativeInt) - debug_overhead`.\n- Verify old pointer remains valid after invalid `ReallocMem`.\n\nRisk of fix:\nLow. The only behavior change is for invalid inputs that currently corrupt debug metadata.\n\n---\n\n## Finding 3: Event-log locking is incomplete: leak-check open/close paths still access the shared event-log handle without `EventLogLocked`\n\nSeverity: Medium.\n\nConfidence: Confirmed for missing synchronization; Medium-to-High for practical impact depending on whether final leak checking can overlap with other threads.\n\nAffected files/functions:\n`FastMM5.pas`\n\nThe current HEAD added event-log state and lock:\n\n```pascal\n1772 EventLogFilename: array[0..MAX_PATH - 1] of WideChar;\n1775 EventLogFileHandle: THandle;\n1776 EventLogLocked: Integer; //1 = Locked, 0 = Not locked.\n```\n\n```pascal\n3711 procedure LockEventLog;\n3713 while AtomicCmpExchange(EventLogLocked, 1, 0) <> 0 do\n3714 OS_AllowOtherThreadToRun;\n3715 end;\n\n3717 procedure UnlockEventLog;\n3719 EventLogLocked := 0;\n3720 end;\n```\n\nMain `LogEvent` file logging is now locked:\n\n```pascal\n3850 if AEventType in FastMM_LogToFileEvents then\n3851 begin\n3852 LockEventLog;\n3853 try\n3854 LEventLogFileWasOpen := EventLogFileIsOpen;\n3856 if LEventLogFileWasOpen or OpenEventLogFile then\n3857 AppendTextFile(EventLogFileHandle, LPLogHeaderStart, CharCount(LPBuffer, @LTextBuffer));\n3859 if not LEventLogFileWasOpen then\n3860 CloseEventLogFile;\n3861 finally\n3862 UnlockEventLog;\n3863 end;\n3864 end;\n```\n\nBut leak-check pre-open and final close are not locked:\n\n```pascal\n9961 {If leak detail is logged to file, then open the log file once and close it after all leaks have been logged.}\n9962 if mmetUnexpectedMemoryLeakDetail in FastMM_LogToFileEvents then\n9963 OpenEventLogFile;\n```\n\n```pascal\n10076 {The event log file would have been opened when the first leak was detected.}\n10077 CloseEventLogFile;\n```\n\nBug category:\nIncomplete synchronization; diagnostic logging race; shutdown/finalization race.\n\nDetailed description:\nThe new `EventLogLocked` discipline serializes most direct event-log handle access: ordinary `LogEvent`, message-box close, filename set, default filename set, and delete file. However, leak checking still calls `OpenEventLogFile` and `CloseEventLogFile` directly.\n\nThat violates the newly established invariant: every read/write/close/open of `EventLogFileHandle` should occur under `EventLogLocked`.\n\nThe direct leak-check calls matter because leak reporting can produce many `LogEvent` calls, and finalization/shutdown is exactly where other threads can still be misbehaving in real applications. If a worker thread logs a corruption/double-free event while the main finalization thread is doing leak checking, the locked logger can still race with the unlocked leak-check open/close.\n\nExecution scenario:\n\nThread A: main thread during finalization/leak check\n1. Enters leak checking.\n2. Sees `mmetUnexpectedMemoryLeakDetail in FastMM_LogToFileEvents`.\n3. Calls `OpenEventLogFile` at line 9963 without `EventLogLocked`.\n4. Later calls `CloseEventLogFile` at line 10077 without `EventLogLocked`.\n\nThread B: still-running worker thread or late diagnostic path\n1. Enters `LogEvent`.\n2. Acquires `EventLogLocked`.\n3. Reads `EventLogFileHandle` and proceeds to append or conditionally close.\n4. Thread A concurrently opens or closes the same global handle without taking the lock.\n\nPossible interleavings:\n- Thread A closes the file handle while Thread B is appending.\n- Thread B opens/closes based on stale `LEventLogFileWasOpen` while Thread A has independently changed the handle.\n- Thread A opens the file once for leak detail, but Thread B observes/interferes with that lifecycle.\n- `FastMM_SetEventLogFilename` is locked but can still race with the unlocked leak-check open/close if called concurrently.\n\nWhy existing code does not prevent it:\n`OpenEventLogFile` and `CloseEventLogFile` themselves do not acquire the lock. They are helper functions operating directly on `EventLogFileHandle`. The current patch placed locks around most callers, but not these two leak-check callers.\n\nImpact:\nThe original event-log race is mostly fixed, but not fully. Remaining impact is concentrated in leak checking and finalization:\n- Missing or malformed leak-detail log entries.\n- Close-while-write race.\n- Writes to invalid/stale/reopened handle.\n- Rare shutdown diagnostic corruption.\n- Confusing or incomplete memory-leak reports.\n\nReproduction test:\n\nTest goal:\nForce concurrent leak-detail logging and normal diagnostic logging.\n\nRequired platform/compiler/configuration:\nWindows, Delphi XE3+, current FastMM5, debug mode helpful but not strictly required. Enable file logging for `mmetUnexpectedMemoryLeakDetail` and at least one frequent diagnostic event, for example debug double-free events.\n\nPseudocode:\n\n```pascal\nprogram EventLogLeakCheckRace;\n\n{$APPTYPE CONSOLE}\n\nuses\n System.SysUtils,\n System.Classes,\n FastMM5;\n\nvar\n Stop: Boolean = False;\n\nprocedure Worker;\nvar\n P: Pointer;\nbegin\n while not Stop do\n begin\n P := GetMemory(64);\n FreeMemory(P);\n\n try\n // Intentional diagnostic event.\n FreeMemory(P);\n except\n end;\n end;\nend;\n\nbegin\n FastMM_SetEventLogFilename('FastMM-leak-log-race.log');\n\n FastMM_LogToFileEvents := FastMM_LogToFileEvents\n + [mmetUnexpectedMemoryLeakDetail, mmetDebugBlockDoubleFree];\n\n FastMM_MessageBoxEvents := [];\n FastMM_OutputDebugStringEvents := [];\n\n FastMM_EnterDebugMode;\n\n // Start worker threads and intentionally leave them running too late.\n // Also intentionally leak some memory so leak detail logging opens the file.\n\n GetMemory(1024); // intentional leak\n\n // Let finalization perform leak checking while worker still logs.\n // In an instrumented build, insert Sleep calls around lines 9963, 10077,\n // and inside LogEvent's locked append path to widen the window.\nend.\n```\n\nThread count:\nAt least 2; use 16–64 worker threads for stress.\n\nAllocation/free/realloc pattern:\nIntentional leaked blocks plus repeated diagnostic logging events.\n\nSynchronization barriers:\nFor deterministic reproduction, instrument:\n- sleep after line 9963,\n- sleep before line 10077,\n- sleep between `EventLogFileIsOpen` and `AppendTextFile` inside locked `LogEvent`.\n\nExpected failure mode:\nLost/malformed log entries or failed writes. With instrumentation, it should be possible to observe `CloseEventLogFile` running concurrently with locked append.\n\nHow to detect failure:\n- Count expected diagnostic events versus parsed log entries.\n- Instrument `OS_WriteFile` failures.\n- Add an assertion that `OpenEventLogFile`/`CloseEventLogFile` are only called while `EventLogLocked = 1`, then run leak checking.\n\nRun mode:\nStress loop; repeated process startup/shutdown is best.\n\nDebug/full-debug options:\nDebug mode helps create high-frequency diagnostic events.\n\nProposed fix:\nMake `OpenEventLogFile` and `CloseEventLogFile` private helpers with an explicit “must hold `EventLogLocked`” contract, and add locked wrappers for external call sites.\n\nPatch sketch:\n\n```pascal\nprocedure OpenEventLogFileWithLock;\nbegin\n LockEventLog;\n try\n OpenEventLogFile;\n finally\n UnlockEventLog;\n end;\nend;\n\nprocedure CloseEventLogFileWithLock;\nbegin\n LockEventLog;\n try\n CloseEventLogFile;\n finally\n UnlockEventLog;\n end;\nend;\n```\n\nThen change:\n\n```pascal\nif mmetUnexpectedMemoryLeakDetail in FastMM_LogToFileEvents then\n OpenEventLogFile;\n```\n\nto:\n\n```pascal\nif mmetUnexpectedMemoryLeakDetail in FastMM_LogToFileEvents then\n OpenEventLogFileWithLock;\n```\n\nand:\n\n```pascal\nCloseEventLogFile;\n```\n\nto:\n\n```pascal\nCloseEventLogFileWithLock;\n```\n\nDo not hold `EventLogLocked` across the entire leak walk. `LogEvent` also takes the lock; holding it across leak enumeration would either deadlock or serialize too much. Only the brief open/close calls should be locked.\n\nWhy the fix is correct:\nIt makes all global handle open/close/write operations follow one lock discipline. No thread can close or replace the handle while another thread is appending.\n\nFast path performance:\nNo allocator fast-path impact. Leak checking is already slow/diagnostic.\n\nPublic behavior/compatibility:\nNo public API change.\n\nAlternative fixes:\nRemove the leak-check pre-open optimization and let every leak-detail `LogEvent` open/write/close through the already locked path. This is simpler but may be slower and produces many open/close calls.\n\nNew assertions/invariants:\nAdd an internal debug assertion:\n\n```pascal\nAssert(EventLogLocked <> 0);\n```\n\ninside raw `OpenEventLogFile` and `CloseEventLogFile`, or split them into `OpenEventLogFileLocked`/`CloseEventLogFileLocked` to make the contract explicit.\n\nRegression tests:\n- Leak-detail logging with many leaked blocks.\n- Concurrent diagnostic logging during leak check.\n- Concurrent `FastMM_SetEventLogFilename` during leak check.\n- Instrumented assertion that all raw event-log handle access happens under `EventLogLocked`.\n\nRisk of fix:\nLow. Main risk is accidentally holding `EventLogLocked` while calling code that logs again. Keep the lock narrowly scoped to raw handle open/close/write.\n\n---\n\n# Synchronization map\n\n## Shared global state\n\nAllocator state:\n- `SmallBlockTypeLookup`.\n- `SmallBlockManagers`.\n- `MediumBlockManagers`.\n- `LargeBlockManagers`.\n- Pending-free lists in small/medium/large managers.\n- Memory accounting: `MemoryUsageCurrent`, `MemoryUsageLimit`, `MemoryUsageLimitGraceAmount`.\n\nInstallation/lifecycle:\n- `UnitCurrentlyInitialized`.\n- `CurrentInstallationState`.\n- `PreviousMemoryManager`.\n- `InstalledMemoryManager`.\n- `SettingMemoryManager`.\n\nDebug/diagnostic mode:\n- `DebugModeCounter`.\n- `EraseAllocatedBlockContentCounter`.\n- `EraseFreedBlockContentCounter`.\n- `MinimumBlockAlignmentCounter`.\n- `DebugMode_StackTrace_EntryCount`.\n- Debug support DLL handle and function pointers.\n- `FastMM_LastAllocationNumber`.\n- `FastMM_DebugBreakAllocationNumber`.\n- `FastMM_CurrentAllocationGroup` remains global; per issue #69/author note, this is treated as by design, not as a bug.\n\nDiagnostics/logging:\n- `EventLogFilename`.\n- `EventLogFileHandle`.\n- `EventLogLocked` added in current HEAD.\n- `FastMM_LogToFileEvents`, `FastMM_MessageBoxEvents`, `FastMM_OutputDebugStringEvents`.\n- Event message templates and text-file encoding.\n- Expected-memory-leak registry and lock.\n\nSharing:\n- Sharing file-mapping object name/handle and shared memory-manager state.\n\n## Thread-local state\n\nI did not find allocator-owned TLS caches in `FastMM5.pas`. Thread identity is sampled through OS thread ID calls and stored in debug metadata. Cross-thread frees are handled through manager pending-free mechanisms, not through per-thread destructors.\n\n## Locks\n\n- Small-block manager lock: `SmallBlockManagerLocked`.\n- Medium-block manager lock: `MediumBlockManagerLocked`.\n- Large-block manager lock: `LargeBlockManagerLocked`.\n- Memory-manager installation lock: `SettingMemoryManager`.\n- Expected-memory-leak list lock: `ExpectedMemoryLeaksListLocked`.\n- Event-log lock: `EventLogLocked`.\n\n## Atomics\n\n- `AtomicCmpExchange` for spin locks and lock-free pending-free pushes.\n- `AtomicExchange` for draining pending-free lists and opportunistic lock acquisition.\n- `AtomicIncrement` / `AtomicDecrement` for counters and memory accounting.\n- ABA-counter style packed values for sequential feed offsets.\n- Pending-free list operations use atomic pointer exchange/compare-exchange.\n\n## Inferred lock ordering\n\n- Small-block free uses the small manager lock. If a span becomes empty and must be returned to the medium allocator, the small lock is released before medium freeing, avoiding a direct small-then-medium deadlock in that path.\n- Medium allocator operations use the medium manager lock.\n- Large allocator list operations use the large manager lock and release it before OS virtual-free operations.\n- `FastMM_WalkBlocks` can hold medium-manager locks and then attempt small-manager locks with timeouts. The author notes related concerns are by design; I therefore do not classify this as a bug, but callback restrictions should remain explicit.\n- `EventLogLocked` is independent and should be held only around raw event-log handle/filename access. It should not be held across allocator walks, user callbacks, message boxes, or code that can recursively log.\n\n## Initialization/finalization lifecycle\n\n- Initialization installs the memory manager, sets default event-log filename, initializes arenas/managers, and prepares debug/diagnostic state.\n- Finalization processes pending frees, optionally performs leak checking, finalizes debug support/sharing, uninstalls the memory manager, and frees internal memory.\n- Finalization still appears to assume application threads are not concurrently using the allocator. The leak-check event-log path currently violates the new event-log lock discipline if concurrent diagnostics occur during shutdown.\n\n## Areas where the synchronization model is unclear or intentionally global\n\n- Whether public logging configuration sets/templates may be mutated concurrently with logging.\n- Whether `FastMM_TextFileEncoding` is startup-only or may be changed while the log file is open.\n- Whether mode transitions such as `FastMM_EnterDebugMode`, `FastMM_BeginEraseFreedBlockContent`, and alignment changes are expected to be externally serialized.\n- `FastMM_CurrentAllocationGroup` is global by design per the author note, but that should be documented as process-global diagnostic state, not per-thread state.\n- `FastMM_WalkBlocks` callback rules should explicitly say whether callbacks may allocate/free/log or recursively walk.\n\n---\n\n# Test plan\n\n## Immediate regression tests for this HEAD\n\n1. **Erase-freed double-free metadata test**\n - Enable `FastMM_BeginEraseFreedBlockContent`.\n - Allocate/free/double-free small, medium, and large blocks.\n - Verify invalid-free diagnostics do not corrupt subsequent allocations.\n - Instrument small free-list next pointers for deterministic detection.\n\n2. **Debug negative-size tests**\n - `FastMM_DebugGetMem(-1)`.\n - `FastMM_DebugAllocMem(-1)`.\n - `FastMM_DebugReallocMem(P, -1)`.\n - Verify nil/failure and old pointer validity.\n - Run with and without full-debug support DLL.\n\n3. **Prior fixed bug regression tests**\n - Debug `AllocMem` near medium/large threshold returns all zeros.\n - Debug `ReallocMem(P, High(NativeInt))` fails without modifying old block.\n - UTF-16 surrogate-pair conversion emits UTF-8 first byte `$F0..$F4`, not `$E0..`.\n - Multi-threaded normal `LogEvent` file logging with concurrent message-box close path and filename changes.\n\n4. **Leak-check event-log locking test**\n - Enable `mmetUnexpectedMemoryLeakDetail` file logging.\n - Intentionally leak blocks.\n - Concurrently generate diagnostic log events from worker threads during shutdown/leak check.\n - Add assertions that raw `OpenEventLogFile`/`CloseEventLogFile` are lock-protected.\n\n## Core allocator correctness\n\n- Allocate/free all sizes from 0 through the maximum small-block size.\n- Boundary tests around every small-size class.\n- Medium boundaries around bin spacing transitions.\n- Large allocation thresholds and 64 KiB granularity edges.\n- `GetMem`, `FreeMem`, `AllocMem`, `ReallocMem` zero, shrink, grow, same-size, and impossible-size behavior.\n- Alignment tests under default, 16-byte, 32-byte, and 64-byte minimum alignment.\n\n## Multi-thread allocate/free\n\n- Thread counts: 1, 2, 4, 8, 16, 32, 64, 128.\n- Allocation distributions:\n - tiny-heavy,\n - medium-heavy,\n - large bursts,\n - mixed Pareto/Zipf,\n - boundary-biased.\n- Oversubscribe CPU cores and also run pinned-affinity variants.\n\n## Cross-thread free\n\n- Producer threads allocate; consumer threads free.\n- Ring-buffer handoff with sequence barriers.\n- Random delayed free queues to stress pending-free stacks.\n- Verify no leaks, corruption, or memory-usage drift.\n\n## Realloc stress\n\n- Random grow/shrink.\n- Cross class transitions:\n - small → medium,\n - medium → small,\n - medium → large,\n - large → medium,\n - debug header/footer overhead boundaries.\n- Allocation-failure injection for large reallocs; verify old pointer remains valid.\n\n## Initialization/finalization\n\n- Repeated process startup/shutdown.\n- DLL load/unload using `BorlndMM DLL` and memory-sharing demos.\n- Manual `FastMM_Initialize`/`FastMM_Finalize` if automatic install is disabled.\n- Finalization with pending frees.\n- Negative stress: finalization while worker threads are still active, to document failure modes or add guards.\n\n## Debug/full-debug modes\n\nRun the full suite under:\n- normal mode,\n- `FastMM_EnterDebugMode`,\n- full-debug DLL present,\n- full-debug DLL absent,\n- erase-allocated mode,\n- erase-freed mode,\n- corruption-scan-before-every-operation mode.\n\nThe repository includes separate `FullDebugMode DLL` and `BorlndMM DLL` project directories, so these should be included in the Windows/Delphi matrix. citeturn414883view0turn414883view1\n\n## Memory pressure\n\n- Set low `FastMM_SetMemoryUsageLimit` values.\n- Force OS allocation failure.\n- Exercise emergency-reserve logic on 32-bit.\n- Verify graceful failure and no metadata mutation on failed allocation/reallocation.\n\n## Long-running soak\n\n- 12–72 hour mixed allocation stress.\n- Periodic `FastMM_WalkBlocks`.\n- Periodic `FastMM_GetUsageSummary`.\n- Periodic debug-block scans.\n- Intentional sacrificial corruptions to verify diagnostics remain operational.\n\n## Platform/compiler matrix\n\nThe README states Delphi XE3+ and Windows 32-bit/64-bit support, so at minimum: citeturn729783view0\n- Delphi XE3-era compiler if available.\n- Current Delphi 32-bit Windows.\n- Current Delphi 64-bit Windows.\n- Debug and release compiler settings.\n- `PurePascal` enabled where supported.\n- Arena counts 5 through 16.\n- Full-debug DLL static/dynamic configurations.\n- Memory-manager sharing DLL cases.\n\n---\n\n# Areas reviewed with no concrete issue found\n\n- **Prior debug `AllocMem` zero-fill bug:** fixed. Current code uses `PFastMM_DebugBlockHeader(Result)[-1].StackTraceEntryCount`, which correctly refers to the debug header before the user pointer.\n- **Prior `ReallocMem(Max(NativeInt))` debug in-place overflow path:** materially fixed for the large-positive overflow case by using subtraction in the in-place capacity check.\n- **Prior UTF-8 surrogate-pair prefix bug:** fixed. Current code emits `$F0` for four-byte sequences, not `$E0`.\n- **Main event-log file write path:** fixed for ordinary `LogEvent` append/open/close and message-box close path. The remaining problem is the leak-check pre-open/final close path.\n- **Small/medium/large pending-free stack model:** I did not find a concrete supported-use ABA or lost-node bug in the current static pass.\n- **Expected-memory-leak registry:** still appears lock-protected and uses direct OS allocation rather than allocator recursion.\n- **Core normal-mode small/medium/large allocation paths:** no new confirmed valid-use race or metadata corruption bug found in this pass.\n\n---\n\n# Needs further investigation\n\n1. **Mode transition linearizability.** \n Functions such as `FastMM_EnterDebugMode` and erase/alignment mode changes mutate global counters and reinstall memory-manager function pointers. They appear intended as externally controlled diagnostic transitions, not high-frequency concurrent operations. A concurrent caller may observe a mode counter changed before all corresponding function pointers/support-library state has fully transitioned. This needs a documented contract or serialization rule.\n\n2. **Public logging configuration mutation.** \n Event sets, templates, and text-file encoding remain mutable public globals. If they are startup-only, document that. If runtime mutation is supported, they need a clearer lock discipline with event logging.\n\n3. **`FastMM_GetEventLogFilename`.** \n Current code returns a pointer to the global filename buffer. Concurrent readers can observe partial updates if another thread calls `FastMM_SetEventLogFilename`. This is probably a public-API contract issue rather than a core allocator bug.\n\n4. **`ConvertUTF16toUTF8` reads a 32-bit value for surrogate detection.** \n The current call sites seem to have sufficient buffer slack/termination, so I am not reporting this as a bug. Still, a unit test for one-code-unit trailing high surrogate and exact buffer-boundary cases would be useful.\n\n5. **Weak-memory-ordering future support.** \n The supported scope is Windows x86/x64. If ARM or other weakly ordered targets are ever supported, plain unlock writes such as `EventLogLocked := 0` and other spin-lock releases need explicit release semantics.\n\n6. **`FastMM_WalkBlocks` callback restrictions.** \n The author says the concerns are by design. I agree they should not be treated as bugs if the intended contract is “callbacks must not reenter allocator operations.” That contract should be made explicit in comments/docs.\n\n7. **`FastMM_CurrentAllocationGroup`.** \n Also noted by the author as by design. It remains process-global diagnostic state; documentation should make clear it is not thread-local attribution.\n\n---\n\n# Final risk assessment\n\nThe current HEAD is materially better than the previously reviewed commit. The author’s fixes addressed the largest previously reported diagnostic issues: debug `AllocMem` zeroing, `Max(NativeInt)` debug `ReallocMem`, UTF-8 surrogate-pair conversion, and the main event-log handle race.\n\nI did not find a new confirmed supported-use corruption bug in the core small/medium/large allocator fast paths. The highest remaining risks are in diagnostic/hardening modes:\n\n1. **Erase-freed-content mode writes before validation.** \n This is the most serious remaining concrete issue. A double free can poison allocator free-list metadata before invalid-free handling runs.\n\n2. **Debug-mode size validation remains incomplete for negative sizes.** \n The large-positive overflow case was fixed, but a uniform checked debug-size helper is still needed.\n\n3. **Event-log locking is almost, but not fully, applied.** \n Leak-check open/close paths still bypass `EventLogLocked`.\n\nMost valuable next engineering actions:\n- Fix `FastMM_FreeMem_EraseBeforeFree` so it never writes into already freed or unrecognized blocks.\n- Add a shared checked helper for debug actual-size calculation and reject negative sizes before touching metadata.\n- Lock leak-check event-log open/close paths or remove the pre-open optimization.\n- Add regression tests for the three findings above.\n- Document runtime mutability/threading contracts for `FastMM_WalkBlocks`, allocation groups, logging configuration, and mode transitions.","role","assistant","name",{"_586":587},"real_author","tool:web","485f03e3-1ef2-4467-9180-dc35a5cc10a8",{"_582":623,"_584":624,"_133":625},1777386151.1218631,{"_578":45,"_579":622},{"_147":593,"_594":595,"_596":60,"_597":60,"_598":260,"_149":150,"_151":152,"_153":154,"_155":156,"_157":158,"_159":160,"_161":146,"_162":146,"_163":164,"_599":600,"_601":602,"_603":604,"_605":606,"_170":607},[608],"debug_sonic_thread_id","thread_69f0c21b2880832da5e62e4927bd0184","hide_inline_actions","disable_turn_actions","chime_version","reasoning_status","is_reasoning","reasoning_title","Auditing debug support library and memory handling","classifier_response","default","reasoning_start_time",1777386002.452996,"36ad4ee3-448d-41de-b9ac-5b6c2fccf96a",{"_186":187,"_188":338,"_190":609},[610,611,612,613,614],{"_186":193,"_194":615,"_196":315,"_198":326,"_200":621,"_202":-5,"_204":338},{"_186":193,"_194":615,"_196":315,"_198":326,"_200":620,"_202":-5,"_204":338},{"_186":193,"_194":615,"_196":315,"_198":326,"_200":619,"_202":-5,"_204":338},{"_186":193,"_194":615,"_196":315,"_198":326,"_200":618,"_202":-5,"_204":338},{"_186":193,"_194":615,"_196":315,"_198":326,"_200":616,"_202":-5,"_204":338},"https://github.com/pleriche/FastMM5/raw/refs/heads/master/FastMM5.pas",{"_205":617,"_207":329,"_209":244},193767,{"_205":617,"_207":329,"_209":252},{"_205":617,"_207":329,"_209":260},{"_205":617,"_207":329,"_209":132},{"_205":617,"_207":329,"_209":31},[286],"tool","web.run",{"_586":626},"tool:web.run","ebfc1554-e65e-4b96-a6eb-eb2ca41bf893",{"_582":583,"_584":-5,"_133":638},1777386204.27501,{"_578":45,"_579":636},{"_170":633,"_153":154,"_161":146,"_598":260,"_634":60,"_635":132,"_596":60,"_597":60,"_155":156,"_157":158,"_159":160},"commentary","d8086108-ba7c-4d27-9a9e-e31920e3bf11","is_thinking_preamble_message","preamble_version",[637],"HEAD is now `fd1d4899478b10b6fa113d47fc900112563523ef`, with the Apr 28 fixes present. 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Chat history

Bug Audit FastMM5 HEAD