[Bug 49463] New: wineserver segfaulting on exit

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=49463

Bug ID: 49463
           Summary: wineserver segfaulting on exit
           Product: Wine-staging
           Version: unspecified
          Hardware: x86
                OS: Linux
            Status: NEW
          Keywords: regression
          Severity: normal
          Priority: P2
         Component: -unknown
          Assignee: [e-mail]
          Reporter: [e-mail]
                CC: [e-mail], [e-mail]
      Distribution: ---

I don't see anything unusual in the terminal, but my systemd journal is full of
these whenever wineserver quits:
kernel: wineserver[1140]: segfault at 0 ip 0000000000000000 sp 00000000ffb4794c
error 14 in wineserver[5f9a7000+7000]
kernel: Code: Bad RIP value.

To reproduce the problem run 'winecfg' then close the window by clicking <OK>.

This is after today's rebase, 
https://github.com/wine-staging/wine-staging/commit/37fc290f7786687b95a90b58...

wine-5.11-179-g13b2587d4f (Staging) on Arch Linux