[tor-bugs] #25962 [Applications/Tor Browser]: Tor Browser crash: [xcb] Unknown sequence number while processing queue

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#25962: Tor Browser crash: [xcb] Unknown sequence number while processing queue
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     Reporter:  cypherpunks               |      Owner:  tbb-team
         Type:  defect                    |     Status:  new
     Priority:  Medium                    |  Milestone:
    Component:  Applications/Tor Browser  |    Version:
     Severity:  Normal                    |   Keywords:  tbb-crash
Actual Points:                            |  Parent ID:
       Points:                            |   Reviewer:
      Sponsor:                            |
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 Happened after I switched to Lubuntu (latest LTS, latest Tor Browser alpha
 64),

 {{{
 [notice] Have tried resolving or connecting to address '[scrubbed]' at 3
 different places. Giving up.
 [xcb] Unknown sequence number while processing queue
 [xcb] Most likely this is a multi-threaded client and XInitThreads has not
 been called
 [xcb] Aborting, sorry about that.
 firefox: ../../src/xcb_io.c:259: poll_for_event: Assertion
 `!xcb_xlib_threads_sequence_lost' failed.
 [Child 4116] WARNING: pipe error (3): Connection reset by peer: file
 /var/tmp/build/firefox-
 90e16dd25b6e/ipc/chromium/src/chrome/common/ipc_channel_posix.cc, line 322
 [Child 4116] ###!!! ABORT: Aborting on channel error.: file /var/tmp/build
 /firefox-90e16dd25b6e/ipc/glue/MessageChannel.cpp, line 2152
 [Child 4116] ###!!! ABORT: Aborting on channel error.: file /var/tmp/build
 /firefox-90e16dd25b6e/ipc/glue/MessageChannel.cpp, line 2152
 [notice] Owning controller connection has closed -- exiting now.
 [notice] Catching signal TERM, exiting cleanly.
 ./start-tor-browser: line 372:  4023 Aborted                 (core dumped)
 TOR_CONTROL_PASSWD=${TOR_CONTROL_PASSWD} ./firefox --class "Tor Browser"
 -profile TorBrowser/Data/Browser/profile.default "${@}" < /dev/null
 }}}

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/25962>
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