[Bug 53099] New: wineserver (gcc -O0) crash when exiting LiLi USB Creator

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=53099

Bug ID: 53099
           Summary: wineserver (gcc -O0) crash when exiting LiLi USB
                    Creator
           Product: Wine
           Version: 7.10
          Hardware: x86-64
               URL: http://download.tuxfamily.org/lilicreator/stable/Linux
                    Live%20USB%20Creator%202.9.4.exe
                OS: Linux
            Status: NEW
          Keywords: download, regression, source
          Severity: critical
          Priority: P2
         Component: wineserver
          Assignee: [e-mail]
          Reporter: [e-mail]
   Regression SHA1: a61188bfa5bf20443b11f397d8ef6e7e5fd4bdf1
      Distribution: Ubuntu

Created attachment 72529
  --> https://bugs.winehq.org/attachment.cgi?id=72529
Wine 7.10 (gcc -O0) console output

When Wine is compiled with -O0 (no optimisation), wineserver crashes when
exiting the LinuxLive USB Creator. -O1, -O2 or -O3 optimisation doesn't
experience the crash.Tried with GCC 7 and 8.

[334632.437161] wineserver[471477]: segfault at aaaaaace ip 00000000566503c3 sp
00000000ffb530a0 error 4 in wineserver[56634000+99000]
[334632.437172] Code: 8d 90 38 6d fd ff 52 89 c3 e8 e9 ad fe ff 90 8b 5d fc c9
c3 55 89 e5 83 ec 08 e8 c7 cc fe ff 05 10 1a 08 00 8b 45 08 8b 40 28 <8b> 40 24
83 ec 08 ff 75 0c ff 75 08 ff d0 83 c4 10 90 c9 c3 55 89

gcc (Ubuntu 7.5.0-3ubuntu1~18.04) 7.5.0
gcc-8 (Ubuntu 8.4.0-1ubuntu1~18.04) 8.4.0

Bisect shows this started happening at

commit a61188bfa5bf20443b11f397d8ef6e7e5fd4bdf1
Author: Jacek Caban 
Date:   Fri Nov 27 18:13:59 2020 +0100

server: Use separated fd ops for unbound console input.

Signed-off-by: Jacek Caban 
    Signed-off-by: Alexandre Julliard