*** This bug is a duplicate of bug 1782984 ***
https://bugs.launchpad.net/bugs/1782984
** This bug is no longer a duplicate of bug 1886059
gnome-shell crashed with assertion failure "!xcb_xlib_threads_sequence_lost"
[xcb_io.c:260]
** This bug has been marked a duplicate of bug 1782984
Assertion `!xcb_xlib_threads_sequence_lost' failed with multiple applications
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https://bugs.launchpad.net/bugs/1877075
Title:
gnome-shell crashed at xcb_io.c:260: poll_for_event: Assertion
`!xcb_xlib_threads_sequence_lost'' failed
Status in Mutter:
Unknown
Status in mutter package in Ubuntu:
Fix Released
Status in mutter source package in Focal:
Fix Released
Status in mutter source package in Groovy:
Fix Released
Bug description:
[Impact]
This is the #1 crasher of gnome-shell in Ubuntu 20.04, though it's
duplicated across multiple problem reports according to locale:
https://errors.ubuntu.com/problem/4de3d315d9df1c9699bda54beafeeeea8d52053c
https://errors.ubuntu.com/problem/2251b638f7a6167772f922dc5916740522c5c22b
https://errors.ubuntu.com/problem/943838b8a80c1da4f8df584b7d2ad3a13361fdd7
https://errors.ubuntu.com/problem/4b78bc9730e8681f0c42fc2ecea14d03544394f0
[Test Case]
None known. The plan is to just continue monitoring crash reports.
Still, we are confident this is the fix because:
* The offending source code in libx11 tells us it is :) and
* The crash only started in Ubuntu with gnome-shell 3.34, which is the
exact release in which XInitThreads was removed from mutter.
[Regression Potential]
Low. We add a single function call that tells libX11 to enable thread
safety. This is the same as what we had in bionic, cosmic and disco,
so it's well tested.
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