[mimalloc-redirect] Redirect fails on Win11

[ovaar]

Hey!

I seem to have found an issue on a Windows 11 machine where mimalloc-redirect fails.
For many other systems it works just fine, perhaps a recent Windows update is the cause?

• Is there a way I can provide more information about the reason mimalloc-redirect fails?
• "minject.exe" --force --inplace is called to reorder mimalloc dlls for the executable

mimalloc git hash: 754a98de5e2912fddbeaf24830f982b4540992f1bab4a0a8796ee118e0752bda
Operating System: Windows 11 Pro 64-bit (10.0, Build 26200) (26100.ge_release.240331-1435)

# mimalloc conan msvc.profile
settings
  arch: x86_64
  build_type: Release
  compiler: msvc
  compiler.cppstd: 23
  compiler.runtime: dynamic
  compiler.runtime_type: Release
  compiler.version: 194
  os: Windows
options
  guarded: False
  override: True
  secure: False
  shared: True
  win_redirect: True

Mimalloc version: 224
Is redirected: NO
Memory state: 1
Disable env var: 1
Verbose env var: 3
Options enabled: show_errors=ON, verbose=ON, show_stats=ON
  
mimalloc: v2.2.4, release (built on Nov 17 2025, 09:39:13)
mimalloc: option 'show_errors': 0 
mimalloc: option 'show_stats': 0 
mimalloc: option 'verbose': 3 
mimalloc: option 'eager_commit': 1 
mimalloc: option 'arena_eager_commit': 2 
mimalloc: option 'purge_decommits': 1 
mimalloc: option 'allow_large_os_pages': 0 
mimalloc: option 'reserve_huge_os_pages': 0 
mimalloc: option 'reserve_huge_os_pages_at': -1 
mimalloc: option 'reserve_os_memory': 0 KiB
mimalloc: option 'deprecated_segment_cache': 0 
mimalloc: option 'deprecated_page_reset': 0 
mimalloc: option 'abandoned_page_purge': 0 
mimalloc: option 'deprecated_segment_reset': 0 
mimalloc: option 'eager_commit_delay': 1 
mimalloc: option 'purge_delay': 10 
mimalloc: option 'use_numa_nodes': 0 
mimalloc: option 'disallow_os_alloc': 0 
mimalloc: option 'os_tag': 100 
mimalloc: option 'max_errors': 32 
mimalloc: option 'max_warnings': 32 
mimalloc: option 'max_segment_reclaim': 10 
mimalloc: option 'destroy_on_exit': 0 
mimalloc: option 'arena_reserve': 1048576 KiB
mimalloc: option 'arena_purge_mult': 10 
mimalloc: option 'purge_extend_delay': 1 
mimalloc: option 'abandoned_reclaim_on_free': 0 
mimalloc: option 'disallow_arena_alloc': 0 
mimalloc: option 'retry_on_oom': 400 
mimalloc: option 'visit_abandoned': 0 
mimalloc: option 'guarded_min': 0 
mimalloc: option 'guarded_max': 1073741824 
mimalloc: option 'guarded_precise': 0 
mimalloc: option 'guarded_sample_rate': 0 
mimalloc: option 'guarded_sample_seed': 0 
mimalloc: option 'target_segments_per_thread': 0 
mimalloc: option 'generic_collect': 10000 
mimalloc: debug level : 0
mimalloc: secure level: 0
mimalloc: mem tracking: none
mimalloc: process init: 0x2221D9C000
mimalloc-redirect: warning: standard malloc is _not_ redirected! -- using regular malloc/free. (v1.3.3)
mimalloc: using 1 numa regions
mimalloc: reserved 1048576 KiB memory

[daanx]

Can you try to run with MIMALLOC_VERBOSE=3 ? That should give more info why the redirection failed. Thanks!

[ovaar]

I double-checked and these are the logs.
As you can see from the logs mimalloc: option 'verbose': 3, you can see that MIMALLOC_VERBOSE=3 was enabled.

[malkia]

Hi @ovaar! We are using mimalloc from the dev3 branch on Windows 11, and it works for us on half-dozen thousand machines (user & CI). I see that you are on 2.2.4 - maybe that version does not have the latest redirector - https://github.com/microsoft/mimalloc/tree/dev3/bin - AFAIK - pulling these redirectors and mInject should be backwards compatible with 2.2.4 - I've patched few months ago a branch that we have where 2.2.4 was still in use with latest redirect dlls from 3 and it worked, but I'll leave to @daanx to confirm

(Also I myself am on latest beta of Windows 26220.7271 and still works for me).