Thank you for taking the time to report this bug and helping to make
Ubuntu better. It sounds like some part of the system has crashed. To
help us find the cause of the crash please follow these steps:

1. Look in /var/crash for crash files and if found run:
    ubuntu-bug YOURFILE.crash
Then tell us the ID of the newly-created bug.

2. If step 1 failed then look at https://errors.ubuntu.com/user/ID where
ID is the content of file /var/lib/whoopsie/whoopsie-id on the machine.
Do you find any links to recent problems on that page? If so then please
send the links to us.

3. If step 2 also failed then apply the workaround from bug 994921,
reboot, reproduce the crash, and retry step 1.

Please take care to avoid attaching .crash files to bugs as we are
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risk for yourself.


** Changed in: gnome-shell (Ubuntu)
       Status: New => Incomplete

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to gnome-shell in Ubuntu.
https://bugs.launchpad.net/bugs/1801110

Title:
  gnome-shell crashes ending session upon DP monitor switch-away

Status in gnome-shell package in Ubuntu:
  Incomplete

Bug description:
  I have a DisplayPort switching arrangement consisting of a 4way DP
  switch that switches 2, daisy-chained DP monitors.

  Many times, but not always, when switching the displays away from this
  host, gnome-shell crashes. Later, switching back, I'm presented with
  the gdm login screen, previous session is gone.

  journal trace.


  Oct 31 14:26:17 u24b6-skull org.gnome.Shell.desktop[16220]: 
[16887:16887:1031/142617.735610:ERROR:gl_surface_presentation_helper.cc(237)] 
GetVSyncParametersIfAvailable() failed!
  Oct 31 14:26:17 u24b6-skull org.gnome.Shell.desktop[16220]: 
[16887:16887:1031/142617.828123:ERROR:gl_surface_presentation_helper.cc(237)] 
GetVSyncParametersIfAvailable() failed!
  Oct 31 14:26:17 u24b6-skull org.gnome.Shell.desktop[16220]: 
[16887:16887:1031/142617.829899:ERROR:gl_surface_presentation_helper.cc(237)] 
GetVSyncParametersIfAvailable() failed!
  Oct 31 14:26:17 u24b6-skull org.gnome.Shell.desktop[16220]: 
[16887:16887:1031/142617.844313:ERROR:gl_surface_presentation_helper.cc(237)] 
GetVSyncParametersIfAvailable() failed!
  Oct 31 14:26:19 u24b6-skull org.gnome.Shell.desktop[16220]: 
[16887:16887:1031/142619.936305:ERROR:sync_control_vsync_provider.cc(141)] 
Calculated bogus refresh interval=0.999619 s, l
  Oct 31 14:26:20 u24b6-skull org.gnome.Shell.desktop[16220]: 
[16887:16887:1031/142620.866151:ERROR:sync_control_vsync_provider.cc(141)] 
Calculated bogus refresh interval=1.00119 s, la
  Oct 31 14:26:21 u24b6-skull org.gnome.Shell.desktop[16220]: 
[16887:16887:1031/142621.876094:ERROR:sync_control_vsync_provider.cc(141)] 
Calculated bogus refresh interval=1.00083 s, la
  Oct 31 14:26:22 u24b6-skull org.gnome.Shell.desktop[16220]: 
[16887:16887:1031/142622.866910:ERROR:sync_control_vsync_provider.cc(141)] 
Calculated bogus refresh interval=1.00015 s, la
  Oct 31 14:26:23 u24b6-skull org.gnome.Shell.desktop[16220]: 
[16887:16887:1031/142623.866649:ERROR:sync_control_vsync_provider.cc(141)] 
Calculated bogus refresh interval=0.999805 s, l
  Oct 31 14:26:24 u24b6-skull org.gnome.Shell.desktop[16220]: 
[16887:16887:1031/142624.866857:ERROR:sync_control_vsync_provider.cc(141)] 
Calculated bogus refresh interval=1.00075 s, la
  Oct 31 14:26:25 u24b6-skull org.gnome.Shell.desktop[16220]: 
[16887:16887:1031/142625.867939:ERROR:sync_control_vsync_provider.cc(141)] 
Calculated bogus refresh interval=1.00054 s, la
  Oct 31 14:26:26 u24b6-skull org.gnome.Shell.desktop[16220]: 
[16887:16887:1031/142626.867620:ERROR:sync_control_vsync_provider.cc(141)] 
Calculated bogus refresh interval=0.999784 s, l
  Oct 31 14:26:27 u24b6-skull org.gnome.Shell.desktop[16220]: (EE)
  Oct 31 14:26:27 u24b6-skull org.gnome.Shell.desktop[16220]: (EE) Backtrace:
  Oct 31 14:26:27 u24b6-skull org.gnome.Shell.desktop[16220]: (EE) 0: 
/usr/bin/Xwayland (OsLookupColor+0x139) [0x561135c42c39]
  Oct 31 14:26:27 u24b6-skull org.gnome.Shell.desktop[16220]: (EE) 1: 
/lib/x86_64-linux-gnu/libpthread.so.0 (funlockfile+0x50) [0x7fd818e74e1f]
  Oct 31 14:26:27 u24b6-skull org.gnome.Shell.desktop[16220]: (EE) 2: 
/usr/bin/Xwayland (present_extension_init+0xce6) [0x561135bab416]
  Oct 31 14:26:27 u24b6-skull org.gnome.Shell.desktop[16220]: (EE) 3: 
/usr/bin/Xwayland (glamor_egl_fd_from_pixmap+0x390) [0x561135aed380]
  Oct 31 14:26:27 u24b6-skull org.gnome.Shell.desktop[16220]: (EE) 4: 
/usr/bin/Xwayland (glamor_egl_fd_from_pixmap+0x533) [0x561135aed6f3]
  Oct 31 14:26:27 u24b6-skull org.gnome.Shell.desktop[16220]: (EE) 5: 
/usr/bin/Xwayland (TimerSet+0x180) [0x561135c3c4b0]
  Oct 31 14:26:27 u24b6-skull org.gnome.Shell.desktop[16220]: (EE) 6: 
/usr/bin/Xwayland (TimerSet+0x1f8) [0x561135c3c578]
  Oct 31 14:26:27 u24b6-skull org.gnome.Shell.desktop[16220]: (EE) 7: 
/usr/bin/Xwayland (WaitForSomething+0x277) [0x561135c3c657]
  Oct 31 14:26:27 u24b6-skull org.gnome.Shell.desktop[16220]: (EE) 8: 
/usr/bin/Xwayland (SendErrorToClient+0x10c) [0x561135c0c95c]
  Oct 31 14:26:27 u24b6-skull org.gnome.Shell.desktop[16220]: (EE) 9: 
/usr/bin/Xwayland (InitFonts+0x3b6) [0x561135c10b36]
  Oct 31 14:26:27 u24b6-skull org.gnome.Shell.desktop[16220]: (EE) 10: 
/lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xeb) [0x7fd818c9c09b]
  Oct 31 14:26:27 u24b6-skull org.gnome.Shell.desktop[16220]: (EE) 11: 
/usr/bin/Xwayland (_start+0x2a) [0x561135ae21ea]
  Oct 31 14:26:27 u24b6-skull org.gnome.Shell.desktop[16220]: (EE)
  Oct 31 14:26:27 u24b6-skull org.gnome.Shell.desktop[16220]: (EE) Segmentation 
fault at address 0x0
  Oct 31 14:26:27 u24b6-skull org.gnome.Shell.desktop[16220]: (EE)
  Oct 31 14:26:27 u24b6-skull org.gnome.Shell.desktop[16220]: Fatal server 
error:
  Oct 31 14:26:27 u24b6-skull org.gnome.Shell.desktop[16220]: (EE) Caught 
signal 11 (Segmentation fault). Server aborting

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