[cairo-bugs] [Bug 98883] BadAccess errors in ShmAttach due to thread races with XNextRequest() usage in cairo-xlib-surface-shm.c

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98883

--- Comment #6 from Daniel van Vugt <daniel.van.vugt at canonical.com> ---
Created attachment 139297
  --> https://bugs.freedesktop.org/attachment.cgi?id=139297&action=edit
Handle-XShmAttach-failures-v1.patch

I found myself amongst this code in the process of trying to fix a crash in the
Ubuntu 18.04 graphical installer (https://launchpad.net/bugs/1751252).

Here's a patch to fix that, and hopefully this bug too.

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