Re: iceweasel locking up under KDE, fine under Xfce

[Arthur Marsh <arthur.marsh@internode.on.net>]

Arthur Marsh wrote on 10/11/15 08:22:
> Arthur Marsh wrote on 10/11/15 07:49:
> > For the second time I'm seeing this bug:
> >
> > http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=804060
> >
> > some upgrade in the last few days did it, my local Debian mirror wasn't
> > updating and when I switched to an alternative had over 100 packages to
> > update.
> >
> > The problem could be related to using a Radeon3200HD onboard graphics
> > chip / vdpau.
> >
> > I'll try removing vdpau libraries and downgrading likely libraries and
> > am open to other suggesitons to try to isolate the cause.
> >
> > The only error I get in dmesg is:
> >
> > [  308.499736] kactivitymanage[4194]: segfault at 7f7a85b35cd0 ip
> > 000000302bc14291 sp 00007ffce281db78 error 4 in
> > libQt5Sql.so.5.5.1[302bc00000+3f000]
> > [ 1088.569088] kactivitymanage[4828]: segfault at 7fdfc616ecd0 ip
> > 000000302bc14291 sp 00007fff3a3658d8 error 4 in
> > libQt5Sql.so.5.5.1[302bc00000+3f000]
> >
> > Arthur.
>
> I moved the r600 vdpau libraries out the way and restarted X and kdm and
> the problem did not occur, however I'd still like to pinpoint the cause.
>
> Arthur.

After another try with no r600 vdpau library, KDE again locked up when 
starting iceweasel.

I had a look with gdb --pid on the pid's of iceweasel, kwin_x11 and 
plasmashell, which had the most cpu showing in top in a konsole window 
when the lockup occurred, and also for the Xorg process. All processes 
except iceweasel seemed to be stuck in poll or select.

iceweasel showed at the end of a bt full:

#60 0x00007f1828971680 in  ()
#61 0x0000000000000581 in  ()
#62 0x00007ffc63cdc970 in  ()
Python Exception <class 'OverflowError'> int too big to convert:
#63 0xffffffffffffffff in  ()#64 0x00007f18273f6740 in 
js::jit::DoSetPropFallbackInfo () at /usr/lib/iceweasel/libxul.so
#65 0x00007f180c951a60 in  ()
#66 0x00007f1801c1a9fc in  ()
#67 0x0000000000000881 in  ()
#68 0x00007ffc63cdc9d8 in  ()
#69 0x00007f17f3e9e980 in  ()
---Type <return> to continue, or q <return> to quit---
Python Exception <class 'OverflowError'> int too big to convert:
Python Exception <class 'OverflowError'> int too big to convert:
Python Exception <class 'OverflowError'> int too big to convert:
Python Exception <class 'OverflowError'> int too big to convert:
Python Exception <class 'OverflowError'> int too big to convert:
Python Exception <class 'OverflowError'> int too big to convert:
#70 0xffffffffffffffff in  ()#71 0xffffffffffffffff in  ()#72 
0xffffffffffffffff in  ()#73 0xffffffffffffffff in  ()#74 
0xffffffffffffffff in  ()#75 0xffffffffffffffff in  ()#76 
0x0000000000000000 in  ()

Any suggestions for further debugging welcome.

Arthur.