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

[jnns]

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)

[Daniel van Vugt (vanvugt)]

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 unable to process them as file attachments. It would also be a security risk for yourself.

[Launchpad Janitor (janitor)]

[Expired for gnome-shell (Ubuntu) because there has been no activity for 60 days.]