[Bug 55014] New: kernel32:comm crashes in WoW64 mode on Linux

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=55014

Bug ID: 55014
           Summary: kernel32:comm crashes in WoW64 mode on Linux
           Product: Wine
           Version: unspecified
          Hardware: x86-64
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: kernel32
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

kernel32:comm crashes in WoW64 mode on Linux:

comm.c:708: Found Com port COM1. Connected devices may disturb results
Unhandled exception: page fault on read access to 0x0000000000000000 in 64-bit
code (0x007f47b448083c).
[...]
=>0 0x007f47b448083c wait_for_event+0x1c(arg=<internal error>)
[/home/winetest/tools/testbot/var/wine-wow64/../wine/dlls/ntdll/unix/serial.c:945]
in ntdll.so (0000000000000000)
0x007f47b448083c wait_for_event+0x1c
[/home/winetest/tools/testbot/var/wine-wow64/../wine/dlls/ntdll/unix/serial.c:945]
in ntdll.so: mov (%rdi), %rdi
945        if (!server_get_unix_fd( commio->hDevice, FILE_READ_DATA |
FILE_WRITE_DATA, &fd, &needs_close, NULL, NULL ))

See https://test.winehq.org/data/patterns.html#kernel32:comm

The failure seems to only happen on the TestBot VMs, maybe because of QEmu,
particularly because it does not set the baud rate correctly.

A bisect shows that this failure started with the commit below:

commit b337c5b1a1757b2abbc90a7c6955d64242861ab9
Author: Alexandre Julliard 
Date:   Fri Jun 2 09:35:29 2023 +0200

ntdll: Use the default ABI for all functions on the Unix side.