[Bug 51778] New: ws2_32:sock crashes due to a double free

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=51778

            Bug ID: 51778
           Summary: ws2_32:sock crashes due to a double free
           Product: Wine
           Version: unspecified
          Hardware: x86-64
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: winsock
          Assignee: wine-bugs at winehq.org
          Reporter: fgouget at codeweavers.com
      Distribution: ---

ws2_32:sock crashes due to a double free. This happens in all Wine builds
(win32 & wow*). In the report one usually sees a regular crash message:

sock.c:5599: Test marked todo: expected 1, got 0
Unhandled exception: page fault on execute access to 0x45455246, invalid
program stack in 32-bit code (0x45455246).
...

https://test.winehq.org/data/patterns.html#ws2_32:sock

But the tell-tale error is in the Wine logs ('Show full task log' in  the
TestBot):

free(): double free detected in tcache 2

A bisect shows that this started with the commit below:

commit 1eb56b20baefcdccaafbb622cadc71670c149e18
Author: Zebediah Figura <zfigura at codeweavers.com>
Date:   Tue Sep 14 01:02:48 2021 -0500

    ntdll: Explicitly return whether an async is complete in async_callback_t.

    Signed-off-by: Zebediah Figura <zfigura at codeweavers.com>
    Signed-off-by: Alexandre Julliard <julliard at winehq.org>

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