[Bug 52213] Thread crashes when pthread_exit is called in a SIGQUIT handler

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=52213

Rémi Bernon <rbernon at codeweavers.com> changed:

           What    |Removed                     |Added
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                 CC|                            |rbernon at codeweavers.com

--- Comment #12 from Rémi Bernon <rbernon at codeweavers.com> ---
Although there's possibly some stack smashing happening, I believe the main
issue that makes pthread_exit fail to unwind is that it loses track of the
stack pointer in the syscall frame, as we don't have .cfi instructions there
and as we're overwriting all the registers and swapping stack pointers.

I think we could let pthread unwind the unix-side stack, by making sure the
.cfi instructions point to the unix-side frames only. I implemented such a
change and sent it to the M-L as
<https://source.winehq.org/patches/data/225920>,
<https://source.winehq.org/patches/data/225921>,
<https://source.winehq.org/patches/data/225922>, and
<https://source.winehq.org/patches/data/225923>. Somehow what libunwind really
(and only) needs is to find %rip, although I'm not completely sure why is that.

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