[Bug 1766875] [NEW] Firefox and plugin-container (Chrome_ChildThr): segfault at 0 ip, sp error 6 in plugin-container/libxul.so

SK 1766875 at bugs.launchpad.net
Wed Apr 25 13:40:26 UTC 2018

Public bug reported:

parent report :

from parent:
Hello Robie.

Unfortunately, this problem appeared again. Today, I have had Firefox
enabled with just two tabs: YouTube and Google Translate. Suddenly,
system start to slow down, disk diode was... red all the time, mouse
cursor moved slowly etc. After a couple of minutes, I managed to start
terminal and used '$ killall firefox' command, which helped -- system
started to work faster again, clicking e.g. on a file, opened Mousepad
almost immediately, in milliseconds etc.

Log files (such as '/var/log/syslog' or '/var/log/kern.log') contains:

✓ Sep 4 13:46:00 holycross kernel: [10194.439105] Chrome_~dThread[3599]: segfault at 0 ip b03f6b24 sp afaa1040 error 6 in libxul.so[afb73000+570f000]
✓ Sep 4 13:46:00 holycross kernel: [10195.084439] Chrome_~dThread[4040]: segfault at 0 ip b042fb24 sp afada040 error 6 in libxul.so[afbac000+570f000]

As we can see, there is a problem in 'libxul.so'. (See bug title.)
Firefox version: 55.0.2 (32-bit), e10s enabled (4. processes; changed
from 2. after update), four addons, no Flash. RAM memory checked with
memtest64 - no problems.

I will keep an eye on this, because of a couple of months without
problem. Maybe it was just an accident?

Thanks, best regards.

I can confirm this bug for 
> ii  firefox                           59.0.2+build1-0ubuntu0.16.04.3             amd64        Safe and easy web browser from Mozilla

at Ubuntu16.04.4 LTS.

# dmesg
[14428059.786531] Chrome_~dThread[20444]: segfault at 0 ip 00007f4c6ce2ac26 sp 00007f4c6af2eaf0 error 6 in libxul.so[7f4c6bff8000+580f000]
[14428067.756104] Chrome_~dThread[20745]: segfault at 0 ip 00007f1a0892ac26 sp 00007f1a06a2eaf0 error 6 in libxul.so[7f1a07af8000+580f000]
[14428067.756260] Chrome_~dThread[20829]: segfault at 0 ip 00007f5fe362ac26 sp 00007f5fe172eaf0 error 6 in libxul.so[7f5fe27f8000+580f000]

** Affects: firefox (Ubuntu)
     Importance: Undecided
         Status: New

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  Firefox and plugin-container (Chrome_ChildThr): segfault at 0 ip, sp
  error 6 in plugin-container/libxul.so

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