[Bug 1656065] Re: plugin-container (Chrome_ChildThr): segfault at 0 ip b76df673 sp b1efe9f0 error 6.

[daniel CURTIS]

** Description changed:

  Hello.
  
- Yesterday, after a couple of hours of using Firefox (mostly YouTube and
- other websites), web browser unexpectedly had been closed. Next, a
- dialog box related to the Mozilla Crash Reporter appeared - which
- contained a 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. By the way: yesterday an update for flash-plugin was also available
- (see: 1).
+ Some days ago, Firefox unexpectedly had 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
+ AppArmor and second plugin-container segfault. By the way: in the same
+ time an update for flash-plugin was also 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'. These directories are completely empty. However, system log
  files, such as '/var/log/kern.log' or '/var/log/syslog', contains an
- interesting entries. An example:
+ interesting entries:
  
- ---[ /var/log/kern.log:
+ ● /var/log/kern.log:
+ 
+ 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]
  
- There is also an AppArmor entry logged (concerning Firefox), but I don't
- know if it is related with plugin-container segfault. 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).
- Anyway, here is some informations about versions:
+ 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). Anyway, after adding one rule to a profile
+ everything seems to be okay:
+ 
+ owner @{PROC}/[0-9]*/task/* r,
+ 
+ But it's not the first time when AppArmor logs "@{PROC}/*/task/" issue
+ (see: 4). Here are some informations about versions:
  
  ● Firefox: 50.1.0
  ● Flash: 24.0.0.194ubuntu0.12.04.1
  ● Release: 12.04.5 LTS (via `lsb_release -a` command)
  ● Linux: 3.2.0-120-generic-pae (3.2.79) i686
  
  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
+ [4] https://lists.ubuntu.com/archives/apparmor/2016-December/010422.html

** Package changed: adobe-flashplugin (Ubuntu) => firefox (Ubuntu)

** Summary changed:

- plugin-container (Chrome_ChildThr): segfault at 0 ip b76df673 sp b1efe9f0 error 6.
+ Firefox and plugin-container (Chrome_ChildThr): segfault at 0 ip b76df673 sp b1efe9f0 error 6.

** Information type changed from Private to Public

** Tags added: firefox

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https://bugs.launchpad.net/bugs/1656065

Title:
  Firefox and plugin-container (Chrome_ChildThr): segfault at 0 ip
  b76df673 sp b1efe9f0 error 6.

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