Issues

• 3.5.x Mimalloc can't run on win7 x64

  microsoft/mimalloc#1426 · Filter by author digitalgust opened on Oct 7, 2026
  3

• 3.5.1+: mi_free_size uses mi_free_small for small sizes with MI_PAGE_META_IS_ALIGNED, corrupting the heap when a larger block is freed with a small size

  microsoft/mimalloc#1423 · Filter by author isanych opened on Oct 2, 2026
  6

• Freed arena memory stays resident in an idle process; no targeted or size-threshold eager purge short of process-wide purge_delay=0

  microsoft/mimalloc#1422 · Filter by author psiha opened on Oct 1, 2026
  1

• Vendored mimalloc mi_prim_tls_slot() inline asm turns a TLS load into a store when compiled with GCC -masm=intel

  microsoft/mimalloc#1413 · Filter by author lpyu001 opened on Sep 22, 2026
  3

• malloc_normal.current / malloc_huge.current drifts when a thread rarely allocates and frees other threads' memory periodically

  microsoft/mimalloc#1410 · Filter by author molnsona opened on Sep 18, 2026
  4

• Mimalloc arena mi_heap_malloc_aligned has a hidden limit on max alignment of 64 KiB per allocation

  microsoft/mimalloc#1406 · Filter by author OscarTHZhang opened on Sep 16, 2026
  2

• Support official Rust FFI bindings

  microsoft/mimalloc#1405 · Filter by author OscarTHZhang opened on Sep 16, 2026
  1

• version 3.5.0 hangs at startup on Windows Server 2008 R2

  microsoft/mimalloc#1395 · Filter by author pepsi-piece opened on Sep 11, 2026
  3

• Faithful, performant tracking of committed memory and limit enforcement

  microsoft/mimalloc#1392 · Filter by author PerFuchs opened on Sep 3, 2026
  2

• Issues for thread exit and process exit on Windows

  microsoft/mimalloc#1377 · Filter by author Zoxc opened on Aug 28, 2026
  3

• Segfault in mi_arena_try_purge upon exit, same use case as in #1313

  microsoft/mimalloc#1367 · Filter by author MIvanchev opened on Aug 16, 2026
  7

• V3 perfomance charts

  microsoft/mimalloc#1335 · Filter by author oscardssmith opened on Jul 17, 2026
  1

• Use MEM_64K_PAGES?

  microsoft/mimalloc#1329 · Filter by author runewalsh opened on Jul 10, 2026
  1

• [Crash] mimalloc v3.3.1 crash on android in multi thread allocation

  microsoft/mimalloc#1288 · Filter by author p2kyc0ng opened on May 8, 2026
  8

• RSS regression: v3.1.5 → v3.3.0 shows +81% VmRSS on musl/Alpine (26 MB → 47 MB)

  microsoft/mimalloc#1282 · Filter by author justeff opened on Apr 23, 2026
  11

• LLM audit

  microsoft/mimalloc#1271 · Filter by author Zoxc opened on Apr 18, 2026
  11

• reducing tail latency of ram

  microsoft/mimalloc#1256 · Filter by author osevan opened on Apr 9, 2026

• VirusTotal classifies 2/69 mimalloc-redirect.dll (1.3.3)

  microsoft/mimalloc#1248 · Filter by author malkia opened on Mar 22, 2026
  3

• committed > reserved when preallocating huge pages

  microsoft/mimalloc#1236 · Filter by author sergei-dyshel opened on Feb 27, 2026
  2

• Porting mimalloc to Solo5

  microsoft/mimalloc#1234 · Filter by author omegametabroccolo opened on Feb 22, 2026

• Not able to prevent additional mmap-s beside reserved memory

  microsoft/mimalloc#1228 · Filter by author sergei-dyshel opened on Feb 12, 2026
  2

• Crash on startup with security appliance injecting another DLL

  microsoft/mimalloc#1221 · Filter by author gmnl opened on Feb 5, 2026
  5

• Are pre-mmaped arenas only used when allocating with a heap?

  microsoft/mimalloc#1218 · Filter by author ericr-eh opened on Feb 3, 2026
  10

• [Question] Clarification on heap thread-safety and arena usage for console port

  microsoft/mimalloc#1213 · Filter by author emrahsungu opened on Jan 29, 2026
  9

• Crash when tracking enabled

  microsoft/mimalloc#1211 · Filter by author davide-digennaro-nozomi opened on Jan 28, 2026
  1