leakhunt/templates/snapshot.ps1
acbot 57b5e43d0e Initial commit — leak-hunt project complete
Five bugs identified and patched in retail Asheron's Call client:
- v3b: palette refcount over-increment (3-byte NOP at two sites)
- v5: RenderSurface PurgeResource no-op stub (vtable slot 2 thunk)
- v11: two dangling-pointer crash guards (NULL-check + reorder)
- v14: CEnvCell::Destroy ClipPlaneList leak (18-byte JMP to cleanup thunk)
- v22: unpacker stale-pointer SEH guard (whole-function __try/__except)

All five ship in leakfix.dll (117 KB, SHA d282f23c…) which is loaded
by acclient.exe at process start via PE import table patching by
tools/install_leakfix.py.

Controlled 15-client fleet soak: unpatched control died at 26h with
palette exhaustion; all 14 patched clients survived past that point
and reached ≥5-day uptime.

Residual ~15 MB/h growth traced to d3d9.dll's internal slab allocator
(260KB surface backing buffers retained after Release). See REPORT.md
§10 for the full investigation; conclusion is that it's unfixable from
outside d3d9.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
2026-05-23 21:07:58 +02:00

26 lines
680 B
PowerShell

# Take one UMDH stack-tagged heap snapshot of a running process.
#
# Requirements:
# - gflags /i acclient.exe +ust (one-time, registry-set)
# - _NT_SYMBOL_PATH pointing at acclient.pdb directory
# - umdh.exe on PATH (Windows Debugging Tools)
param(
[Parameter(Mandatory=$true)][int]$ProcessId,
[Parameter(Mandatory=$true)][string]$Out
)
$ErrorActionPreference = "Stop"
if (-not $env:_NT_SYMBOL_PATH) {
Write-Warning "_NT_SYMBOL_PATH not set — symbols may not resolve"
}
& umdh.exe -p:$ProcessId -f:$Out
if (-not (Test-Path $Out)) {
throw "umdh produced no output at $Out"
}
$size = (Get-Item $Out).Length
Write-Host "snapshot: $Out ($size bytes)"