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/1799672

Title:
  system freeze / segfault at 0 […] error 4 in libmozjs-60.so.0.0.0

Status in gnome-shell package in Ubuntu:
  Incomplete

Bug description:
  My system completely froze and I couldn't even switch to a TTY
  anymore. This is what the syslog said at the time of the freeze:

  Oct 24 12:01:02 x1cbn firefox-bin[14142]: message repeated 67 times: [ 
Unknown widget type: 95]
  Oct 24 12:01:23 x1cbn wpa_supplicant[1056]: wlp2s0: WPA: Group rekeying 
completed with 6c:70:9f:ef:7b:65 [GTK=TKIP]
  Oct 24 12:01:24 x1cbn firefox-bin[14142]: Unknown widget type: 95
  Oct 24 12:01:57 x1cbn kernel: [10808.537284] gnome-shell[2222]: segfault at 0 
ip 00007fb187753630 sp 00007ffcfb673358 error 4 in 
libmozjs-60.so.0.0.0[7fb1872a8000+709000]
  Oct 24 12:01:57 x1cbn kernel: [10808.537302] Code: 00 48 01 c0 5d c3 0f 1f 40 
00 48 8b 40 08 48 89 47 08 eb c4 66 0f 1f 44 00 00 55 48 89 e5 e8 d7 bf ff ff 
48 8b 40 10 5d c3 90 <48> 8b 07 48 8b 57 08 48 c1 e2 04 4c 8d 04 10 48 c1 fa 04 
eb 0e 0f 
  Oct 24 12:02:24 x1cbn kernel: [10836.176812] sysrq: SysRq : This sysrq 
operation is disabled.
  Oct 24 12:02:25 x1cbn kernel: [10836.436138] sysrq: SysRq : This sysrq 
operation is disabled.
  Oct 24 12:02:25 x1cbn kernel: [10836.697438] sysrq: SysRq : This sysrq 
operation is disabled.
  Oct 24 12:02:25 x1cbn kernel: [10836.907736] sysrq: SysRq : Emergency Sync
  Oct 24 12:02:25 x1cbn kernel: [10836.925197] Emergency Sync complete
  Oct 24 12:02:25 x1cbn kernel: [10837.073863] sysrq: SysRq : Emergency Remount 
R/O

  ProblemType: Bug
  DistroRelease: Ubuntu 18.10
  Package: gnome-shell 3.30.1-2ubuntu1
  Uname: Linux 4.18.8-041808-generic x86_64
  ApportVersion: 2.20.10-0ubuntu13
  Architecture: amd64
  CurrentDesktop: GNOME
  Date: Wed Oct 24 12:08:05 2018
  DisplayManager: gdm3
  InstallationDate: Installed on 2018-08-05 (80 days ago)
  InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 
(20180725)
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=de_DE.UTF-8
   SHELL=/usr/bin/fish
  SourcePackage: gnome-shell
  UpgradeStatus: Upgraded to cosmic on 2018-10-10 (14 days ago)

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