[Desktop-packages] [Bug 1656065] Re: Firefox and plugin-container (Chrome_ChildThr): segfault at 0 ip b76df673 sp b1efe9f0 error 6 in plugin-container/libxul.so

2017-06-01 Thread Walter Garcia-Fontes 
My setup:
Ubuntu 17.04.
Firefox: 53.0.3+build1-0ubuntu0.17.04.2

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

Status in firefox package in Ubuntu:
  Confirmed

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

To manage notifications about this bug go to:
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[Desktop-packages] [Bug 1656065] Re: Firefox and plugin-container (Chrome_ChildThr): segfault at 0 ip b76df673 sp b1efe9f0 error 6 in plugin-container/libxul.so

2017-06-01 Thread Walter Garcia-Fontes 
I'm seeing a similar crash with this message:
[ 5486.157823] Chrome_ChildThr[20218]: segfault at 0 ip 7fa357e6ec10 sp 
7fa34c0fe7f0 error 6 in libxul.so[7fa3571c+401a000]

The page triggering this is:
http://www.lavanguardia.com

Just scrolling down the page I can reproduce this 100% of the times.

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You received this bug notification because you are a member of Desktop
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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 in plugin-container/libxul.so

Status in firefox package in Ubuntu:
  Confirmed

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

To manage notifications about this bug go to:
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[Desktop-packages] [Bug 1656065] Re: Firefox and plugin-container (Chrome_ChildThr): segfault at 0 ip b76df673 sp b1efe9f0 error 6 in plugin-container/libxul.so

2017-05-27 Thread daniel CURTIS 
Hello Thomas. Unfortunately, I can not give you a link to the website,
because it happens randomly. (But mostly during watching YouTube etc.) I
have to check this issue with AppArmor profile disabled or in a complain
mode. But it must wait for sometime. I will let you know, what will be
the result of this test.

And yes, I think you're right: Firefox seems to tolerate some of these
DENIED actions, vide "speech-dispatcher" and blocked "x" access. A
couple of weeks ago I've done a memory test with memtest86+ and
everything is OK.

Best regards.

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to firefox in Ubuntu.
https://bugs.launchpad.net/bugs/1656065

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

Status in firefox package in Ubuntu:
  Confirmed

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

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1656065/+subscriptions

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[Desktop-packages] [Bug 1656065] Re: Firefox and plugin-container (Chrome_ChildThr): segfault at 0 ip b76df673 sp b1efe9f0 error 6 in plugin-container/libxul.so

2017-05-24 Thread Thomas Mayer 
Could you add the http link you have visited when FF crashed? Maybe
someone can reproduce it.

Does your FF also crash with apparmor profile disabled?

My experience is that FF tolerates a lot of these apparmor-blocked
actions which are reported in syslog. These logged errors are not
necessarily the reason why FF crashed. But could, of course.

In your case, I would also check the system memory with mem86. Let it
run during a weekend and see what happens.

-- 
You received this bug notification because you are a member of Desktop
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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 in plugin-container/libxul.so

Status in firefox package in Ubuntu:
  Confirmed

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

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1656065/+subscriptions

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[Desktop-packages] [Bug 1656065] Re: Firefox and plugin-container (Chrome_ChildThr): segfault at 0 ip b76df673 sp b1efe9f0 error 6 in plugin-container/libxul.so

2017-05-24 Thread daniel CURTIS 
Hello.

The last two days were full of the plugin-container segfault. However,
today I noticed that pulseaudio and known alsa-sink issue (see;
)
are related with this problem also. During watch e.g. YT video (with
only one tab opened), suddenly, system is no responsive (with very, very
slow mouse motion), audio is jamming etc. After a couple of minutes I
can enable terminal and slowly run `$ killall firefox` command and check
log files.

And /var/log/syslog file contains plugin-container segfault and alsa-
sink entries. While /var/log/kern.log file contains only plugin-
container entry.

✓ kernel: [24658.609247] plugin-containe[4287]: segfault at 0 ip
800128a8 sp bfdc2430 error 6 in plugin-container[8000f000+1c000]

If it's about pulseaudio/alsa-sink -- log entries are very similar with
these mentioned in above link. There is, of course, a known message:

✓ Most likely this is a bug in the ALSA driver 'snd_hda_intel'. Please
report this issue to the ALSA developers. (...)

Very similar problem:
 Same things in my
case: "The video stops, the audio loops the last second or so, and I get
the following errors."

So, another day, another segfault.

-- 
You received this bug notification because you are a member of Desktop
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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 in plugin-container/libxul.so

Status in firefox package in Ubuntu:
  Confirmed

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

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1656065/+subscriptions

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[Desktop-packages] [Bug 1656065] Re: Firefox and plugin-container (Chrome_ChildThr): segfault at 0 ip b76df673 sp b1efe9f0 error 6 in plugin-container/libxul.so

2017-05-16 Thread daniel CURTIS 
Hi. During five days (since my last post - #5) there was about three,
four segfaults in plugin-container. As always with the same log entry:

✓ May 16 18:19:42 my_linux kernel: [ 3000.656624] plugin-containe[2771]:
segfault at 0 ip 800ee8a8 sp bfbeffe0 error 6 in plugin-
container[800eb000+1c000]

There is a fix needed. Best regards.

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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 in plugin-container/libxul.so

Status in firefox package in Ubuntu:
  Confirmed

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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