Perhaps Invalid was a little harsh. But, for example Apparmor isn't
enforcing on Firefox by defualt, so it seems that you've done things on
your system that you haven't detailed here. So we don't have fulls steps
to reproduce the problem, so this report is at best Incomplete at the
moment, and it isn't clear that your problem is due to a bug rather than
something as a consequence of how you have your system configured.
I appreciate the problem may be hard to reproduce, but it'd be a start
to describe how you've configured a system such that it _could_ happen.
** Changed in: firefox (Ubuntu)
Status: Invalid => Incomplete
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https://bugs.launchpad.net/bugs/1656065
Title:
Firefox and plugin-container (Chrome_ChildThr): segfault at 0 ip, sp
error 6 in plugin-container/libxul.so
Status in firefox package in Ubuntu:
Incomplete
Bug description:
Hello.
Some days ago, Firefox unexpectedly has been closed after a couple of
hours (mostly viewed: YouTube and some other websites). Next, a dialog
box related to the Mozilla Crash Reporter appeared - with message,
that reporter is disabled (which I did earlier via 'about:config' and
*datareporting.healthreport.service.enabled* key set to _false_) and
no crash report is available even via 'about:crashes' etc.
After this situation two entries appeared in the log files: first
related to the AppArmor and second: plugin-container segfault. By the
way: in the same time there was an update for flash-plugin available
(see: 1).
Anyway, 'LastCrash' file (which can be found in
~/.mozilla/firefox/Crash Reports/ directory) contains only:
1484142985. Just like all the others files in this directory. There
are also two folders called: 'events' and 'pending'. But they are
completely empty. However, system log files, such as
'/var/log/kern.log' or '/var/log/syslog', contains an interesting
entries:
● Jan 11 14:56:25 t4 kernel: [ 4161.295639] type=1400
audit(1484142985.517:46): apparmor="DENIED" operation="open"
parent=2818 profile="/usr/lib/firefox/firefox{,*[^s][^h]}"
name="/proc/2818/task/" pid=3253 comm="firefox" requested_mask="r"
denied_mask="r" fsuid=1000 ouid=1000
● Jan 11 14:56:25 t4 kernel: [ 4161.540727] Chrome_ChildThr[2890]:
segfault at 0 ip b76df673 sp b1efe9f0 error 6 in plugin-
container[b76d8000+42000]
As we know, thanks to the plugin-container, plugins are separated from
the browser process, making it more stable, right? So now if a plugin
crashes, Firefox should remains unharmed. It looks like this is a
known problem (see: 2, 3).
By the way; on Moday, 16 January, Firefox has been closed again - no
action from my side. Log files contain the same entries as above:
● Jan 16 16:39:35 t4 kernel: [14373.711834] type=1400
audit(1484581175.931:48): apparmor="DENIED" operation="open"
parent=2532 profile="/usr/lib/firefox/firefox{,*[^s][^h]}"
name="/proc/2532/task/" pid=3389 comm="firefox" requested_mask="r"
denied_mask="r" fsuid=1000 ouid=1000
● Jan 16 16:39:36 t4 kernel: [14373.934394] Chrome_ChildThr[3041]:
segfault at 0 ip b76f8673 sp b1efe9f0 error 6 in plugin-
container[b76f1000+42000]
Anyway, after adding these two rules to the Firefox profile,
everything seems to be OK and there is not DENIED message for
"/proc/*/task/" entry anymore (so the first issue is solved):
owner @{PROC}/[0-9]*/task/ r,
owner @{PROC}/[0-9]*/task/* r,
NOTE: This problem occurs when adobe-flash plugin is not activated and
is permanently disabled and also when is used/enabled. Here are some
informations about versions etc.:
● Firefox: 50.1.0
● Flash: 24.0.0.194ubuntu0.12.04.1
● Linux: 3.2.0-120-generic-pae (3.2.79) i686
● AppArmor: 2.7.102-0ubuntu3.10
● Release: 12.04.5 LTS (via `lsb_release -a` command)
Best regards.
_____________
[1] https://lists.ubuntu.com/archives/precise-changes/2017-January/026047.html
[2] https://bugzilla.mozilla.org/show_bug.cgi?id=1205199
[3] https://bugzilla.redhat.com/show_bug.cgi?id=1253086
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