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Grave bug when playing flash videos

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  Grave bug when playing flash videos Pétùr <peturvilj@gmail.com> - 2017-06-11 23:00 +0200
    Re: Grave bug when playing flash videos Darac Marjal <mailinglist@darac.org.uk> - 2017-06-12 11:10 +0200
      Re: Grave bug when playing flash videos Pétùr <peturvilj@gmail.com> - 2017-06-13 11:50 +0200
    Re: Grave bug when playing flash videos Pétùr <peturvilj@gmail.com> - 2017-06-13 23:10 +0200

#182085 — Grave bug when playing flash videos

I have a serious bug when using flashplayer in debian sid.

This bug freezes everything and I have to do a hard reboot. It happens
with flashplugin and pepperflash when I play a video with flash (both
tested with firefox and chromium). Today I am using pepperflash,
installed by the package browser-plugin-freshplayer-pepperflash.

The bug could occur after playing 2s or 2h. When I play a flash video, I
have ~50% chances to be affected.

I have some difficulties to see where it comes from. I need some help.

Here is the /var/log/debug for the time of the bug (occurred today at
21:25) :

https://hastebin.com/hupeqituji.sql

In /var/log/daemon.log I have some inconsistencies at 21:25:28
represented by:

^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@...

followed by:
Jun 11 21:25:28 punda systemd-modules-load[218]: Inserted module 'lp'
Jun 11 21:25:28 punda systemd-modules-load[218]: Inserted module 'ppdev'
Jun 11 21:25:28 punda systemd[1]: Starting Flush Journal to Persistent
Storage...
Jun 11 21:25:28 punda systemd[1]: Started Load/Save Random Seed.
Jun 11 21:25:28 punda systemd[1]: Started Flush Journal to Persistent
Storage.
Jun 11 21:25:28 punda systemd[1]: Started Create Static Device Nodes in
/dev.
Jun 11 21:25:28 punda systemd[1]: Starting udev Kernel Device Manager...
Jun 11 21:25:28 punda systemd[1]: Started udev Coldplug all Devices.
Jun 11 21:25:28 punda systemd[1]: Started Set the console keyboard layout.
Jun 11 21:25:28 punda systemd[1]: Reached target Local File Systems (Pre).

The same in syslog (a bunch of ^@^@^@^@^@^@^@^@^@^@^@^@^@^@...
 followed by the reboot informations).

Does someone have a idea?

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#182090

[Multipart message — attachments visible in raw view] — view raw

On Sun, Jun 11, 2017 at 10:50:17PM +0200, Pétùr wrote:
>I have a serious bug when using flashplayer in debian sid.
>
>This bug freezes everything and I have to do a hard reboot. It happens
>with flashplugin and pepperflash when I play a video with flash (both
>tested with firefox and chromium). Today I am using pepperflash,
>installed by the package browser-plugin-freshplayer-pepperflash.
>
>The bug could occur after playing 2s or 2h. When I play a flash video, I
>have ~50% chances to be affected.

Have you tried switching to a VT and back when this happens? There was a
bug in... I *think* it was something like opengl ... recently, whereby a
bunch of unrelated programs (chrome/chromium included) could freeze the
display. Switching away from X and back caused the display to refresh
and things would work again (for a time).

>
>I have some difficulties to see where it comes from. I need some help.
>
>Here is the /var/log/debug for the time of the bug (occurred today at
>21:25) :
>
>https://hastebin.com/hupeqituji.sql
>
>In /var/log/daemon.log I have some inconsistencies at 21:25:28
>represented by:
>
>^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@...

This is less's representation of null characters and is an artefact of
journaling file systems. Syslog has told the file system "I'm about to
write X bytes to /var/log/daemon.log" and then, at some point during the
writing of that, you've killed the power. During either fsck or mount
(depending on the file system), the journal is replayed - that is, there
is a log saying "X bytes were being writen to /var/log/daemon.log". Now,
most of those bytes never made it to the disk, but the record is still
there. So the file grows by X bytes of nothing. Now the file system is
consistent (the metadate, at least, the idea being that it's better to
have SOME of the file still there, rather than a broken filesystem)

>
>followed by:
>Jun 11 21:25:28 punda systemd-modules-load[218]: Inserted module 'lp'
>Jun 11 21:25:28 punda systemd-modules-load[218]: Inserted module 'ppdev'
>Jun 11 21:25:28 punda systemd[1]: Starting Flush Journal to Persistent
>Storage...
>Jun 11 21:25:28 punda systemd[1]: Started Load/Save Random Seed.
>Jun 11 21:25:28 punda systemd[1]: Started Flush Journal to Persistent
>Storage.
>Jun 11 21:25:28 punda systemd[1]: Started Create Static Device Nodes in
>/dev.
>Jun 11 21:25:28 punda systemd[1]: Starting udev Kernel Device Manager...
>Jun 11 21:25:28 punda systemd[1]: Started udev Coldplug all Devices.
>Jun 11 21:25:28 punda systemd[1]: Started Set the console keyboard layout.
>Jun 11 21:25:28 punda systemd[1]: Reached target Local File Systems (Pre).
>
>The same in syslog (a bunch of ^@^@^@^@^@^@^@^@^@^@^@^@^@^@...
> followed by the reboot informations).
>
>Does someone have a idea?
>

-- 
For more information, please reread.

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#182118

Le 12/06/2017 à 11:00, Darac Marjal a écrit :
> On Sun, Jun 11, 2017 at 10:50:17PM +0200, Pétùr wrote:
>> I have a serious bug when using flashplayer in debian sid.
>>
>> This bug freezes everything and I have to do a hard reboot. It happens
>> with flashplugin and pepperflash when I play a video with flash (both
>> tested with firefox and chromium). Today I am using pepperflash,
>> installed by the package browser-plugin-freshplayer-pepperflash.
>>
>> The bug could occur after playing 2s or 2h. When I play a flash video, I
>> have ~50% chances to be affected.
> 
> Have you tried switching to a VT and back when this happens? There was a
> bug in... I *think* it was something like opengl ... recently, whereby a
> bunch of unrelated programs (chrome/chromium included) could freeze the
> display. Switching away from X and back caused the display to refresh
> and things would work again (for a time).

Yes I tried to switch to TTY1 with Ctrl+Alt+F1 or to kill X server. The
freeze is global and nothing works at all except a hard, electrical, reboot.

>> In /var/log/daemon.log I have some inconsistencies at 21:25:28
>> represented by:
>>
>> ^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@...
> 
> This is less's representation of null characters and is an artefact of
> journaling file systems. Syslog has told the file system "I'm about to
> write X bytes to /var/log/daemon.log" and then, at some point during the
> writing of that, you've killed the power. During either fsck or mount
> (depending on the file system), the journal is replayed - that is, there
> is a log saying "X bytes were being writen to /var/log/daemon.log". Now,
> most of those bytes never made it to the disk, but the record is still
> there. So the file grows by X bytes of nothing. Now the file system is
> consistent (the metadate, at least, the idea being that it's better to
> have SOME of the file still there, rather than a broken filesystem)

Thanks for the explanation.

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#182169

Le 11/06/2017 à 22:50, Pétùr a écrit :
> 
> This bug freezes everything and I have to do a hard reboot. It happens
> with flashplugin and pepperflash when I play a video with flash (both
> tested with firefox and chromium). Today I am using pepperflash,
> installed by the package browser-plugin-freshplayer-pepperflash.

update to this bug: it happened twice today when waking up from sleep.
the computer was not playing flash videos before the sleep.

It seems the problem is unrelated to flash.

Does someone has a idea of where I can find relevant log to investigate
? /var/log/daemon/log /var/log/message /var/log/syslog do not give me
any clue.

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