Re: Xorg crashes detected by ABRT

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On Thu, Oct 23, 2014 at 02:54:38AM -0400, Jakub Filak wrote:
> Hi folks,
> 
> I ported the ABRT kernel oops detector to journald some time ago, because of
> NoDefaultSyslog change.
> 
> I wanted to do the same with the ABRT Xorg stack trace detector (just because I
> do not like the current implementation and it is possible now [2]), but
> I am not able to trigger the Xorg's stack trace dumper. I tried a couple of
> signals, but all my efforts led to a core dump file caught by the ABRT core
> dump hook.
> 
> I thought I have the 'NoTrapSignals' option set to 'true', but 'grep
> NoTrapSignals -r /etc/ /usr/share/X11/' returns no results.
> 
> Does Xorg handle the fatal signals on its own (it seems it does [3])?

yes, see OsSighandler() and OsInit(). 
http://cgit.freedesktop.org/xorg/xserver/tree/os/osinit.c
the signal handler calls xorg_backtrace() and eventually abort()

Cheers,
   Peter


> If so, how can I trigger it?
> 
> Otherwise, I would love to remove the ABRT Xorg stack trace detector from
> Fedora.
> 
> 
> 
> Regards,
> Jakub
> 
> 1: http://fedoraproject.org/wiki/Changes/NoDefaultSyslog
> 2: http://who-t.blogspot.cz/2014/03/viewing-xorglog-with-journalctl.html
> 3: https://bugzilla.redhat.com/show_bug.cgi?id=1035508#c1
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