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xfwm4 killed with SIGTRAP from glib in clientSendConfigureNotify client.c:699 calling XSendEvent().

Summary

xfwm4 killed with SIGTRAP from glib in clientSendConfigureNotify client.c:699 calling XSendEvent().

Context

  • Xubuntu 20.04, up-to-date, no heavy configuration tweaking or special software installed, no PPA (initially). Machine seems sane, no mysterious crashes.

Path followed

  • xfwm4 crashes (and is automatically restarted) about once a week. (By the way, after xfwm4 restart, all windows get moved to the right and bottom by the thickness of left and top decorations in the style used.)
  • I logged in on /dev/tty1 and there started gdb which ran fxwm4 --replace.
  • Installed Ubuntu PPA for dbgsym packages and xfwm4-dbgsym.
  • This time, crash happened after machine (a laptop) woke from suspend-to-ram. Other crash conditions exist.
  • X session was reachable but could not focus any window, so I guessed xfwm4 was frozen.
  • Indeed on /dev/tty1 gdb was available. Captured stack trace and core dump.
  • Stack trace is attached: gdb_xfwm4_02_bt.txt
  • Core dump available, just ask.