*** This bug is a duplicate of bug 1782984 ***
https://bugs.launchpad.net/bugs/1782984
** This bug has been marked a duplicate of bug 1782984
PCManFM freezes with Assertion `!xcb_xlib_threads_sequence_lost' failed when
clicking on a file or folder in 18.04
** Bug watch removed: Claws
** Also affects: libx11 (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1808710
Title:
!xcb_xlib_threads_sequence_lost
Apparently it's a bug in libx11, which persisted for a long time but
became much more likely with an update in libxcb.
Please see the still open merge request/patch at
https://gitlab.freedesktop.org/xorg/lib/libx11/-/merge_requests/34
Further reading:
This bug report (as it turned out now, it's
Code::Blocks is affected too. I keep losing unsaved work.
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https://bugs.launchpad.net/bugs/1808710
Title:
!xcb_xlib_threads_sequence_lost error with GTK2
I have the same problem with audacious, on UbuntuStudio 18.04
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https://bugs.launchpad.net/bugs/1808710
Title:
!xcb_xlib_threads_sequence_lost error with
I have the same problem with eboard 1.1.3 on Debian Buster. The program
build is quite old (2016), hence it seems that the problem is with some
high-level library.
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** Description changed:
- GTK2 applications randomly crash or freeze with same error. See attached
- files.
+ GTK2 applications randomly crash or freeze with error like:
+
+ [xcb] Unknown sequence number while processing queue
+ [xcb] Most likely this is a multi-threaded client and XInitThreads
Looks like there's an upstream bug against Claws Mail, too:
https://www.thewildbeast.co.uk/claws-mail/bugzilla/show_bug.cgi?id=4203
** Bug watch added: Claws Mail bugzilla #4203
http://www.thewildbeast.co.uk/claws-mail/bugzilla/show_bug.cgi?id=4203
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Unfortunately, setting LIBGL_DRI3_DISABLE to true did not help to bypass
the bug.
On the other hand, the bug does not manifest itself if there is only one
active CPU core. The number of active CPU cores can be controlled by
'maxcpus' kernel parameter: add 'maxcpus=1' to
GRUB_CMDLINE_LINUX_DEFAULT
Apparently, same bug for Audacious media player: https://redmine
.audacious-media-player.org/issues/798 .
Also, Freecad users have encountered the similar error and managed to
bypass is by setting LIBGL_DRI3_DISABLE environment variable to true
before running Freecad:
** Description changed:
- Some gkt2 applications randomly crash with same error. See attached
+ GTK2 applications randomly crash or freeze with same error. See attached
files.
** Changed in: gtk+2.0 (Ubuntu)
Importance: Undecided => Critical
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** Summary changed:
- !xcb_xlib_threads_sequence_lost error
+ !xcb_xlib_threads_sequence_lost error with GTK2 applications
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Related pcmanfm bug
https://bugs.launchpad.net/ubuntu/+source/pcmanfm/+bug/1782984
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https://bugs.launchpad.net/bugs/1808710
Title:
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: gtk+2.0 (Ubuntu)
Status: New => Confirmed
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** Description changed:
- Several applications randomly crash with same error. See attached files.
+ Some gkt2 applications randomly crash with same error. See attached
+ files.
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** Attachment added: "_usr_bin_gpicview.1000.crash"
https://bugs.launchpad.net/ubuntu/+source/freecad/+bug/1808710/+attachment/522/+files/_usr_bin_gpicview.1000.crash
** Package changed: freecad (Ubuntu) => gtk+2.0 (Ubuntu)
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