[Bug 60561] New: Regression in 11.20: wine segfaults in ntdll.so at startup, even winecfg on a fresh prefix

[WineHQ Bugzilla]

http://bugs.winehq.org/show_bug.cgi?id=60561

            Bug ID: 60561
           Summary: Regression in 11.20: wine segfaults in ntdll.so at
                    startup, even winecfg on a fresh prefix
           Product: Wine
           Version: 11.20
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: critical
          Priority: P2
         Component: ntdll
          Assignee: [e-mail]
          Reporter: [e-mail]
  Target Milestone: ---
      Distribution: ---

Since Wine 11.20, every Wine process crashes immediately at startup with
SIGSEGV (exit code 139). This happens even with `winecfg` on a brand-new
prefix, so it is not application-specific. Wine 11.19 works fine on the
same system.

Tested (Kron4ek builds):
- wine-11.20-amd64              -> crash
- wine-11.20-amd64-wow64        -> crash
- wine-11.20-staging-amd64-wow64 -> crash
- wine-11.20-staging-tkg-amd64 / -wow64 -> crash
- wine-11.19-staging-tkg-amd64-wow64 -> works

Steps:
  WINEPREFIX=$HOME/test1120 wine winecfg

dmesg:
  wine64[33896]: segfault at 0 ip 000079249e879589 sp 00007ffe70302d70
  error 4 in ntdll.so[79589,79249e800000+a7000]

gdb backtrace (no symbols) crashes at ntdll.so+0x79589; stack contains
0x7ffe0000 / 0x7ffe1000 (KUSER_SHARED_DATA region), suggesting the crash
happens during early virtual memory setup.

System:
- Xubuntu 24.04, kernel 7.0.0-38-generic
- MacBook Air 2012, Intel i5-3427U (Ivy Bridge), Intel HD 4000, 8 GB RAM
- /dev/ntsync present

Also reproduced on a second machine:
- MacBook Pro Early 2015, Intel Core i5-5257U (Broadwell), 8 GB RAM
- Ubuntu 24.04, Xorg, kernel 7.0.0-38-generic
- wine-11.19-staging-tkg-amd64-wow64 -> works
- wine-11.20-staging-tkg-amd64-wow64 -> crash

I have not bisected yet, since building Wine on this machine is very slow,
but I can test patches or specific builds if needed.

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[Bug 60561] Regression in 11.20: wine segfaults in ntdll.so at startup, even winecfg on a fresh prefix

[WineHQ Bugzilla]

http://bugs.winehq.org/show_bug.cgi?id=60561

Hado <[e-mail]> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |regression

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