Antwort: Re: No core dump on dbus-daemon crash

[Jean-Pierre.Bogler at continental-corporation.com]

> User-vs-root or other core dump size limits?
> 
> http://www.akadia.com/services/ora_enable_core.html

Thank you Rick. I think the trick is the setuid, about which Simon wrote, 
in combination with ulimit settings. 
The system is started by systemd. I know that RLIMIT_CORE can be 
configured in the unit files, but I think 
the configuration will have no effect, because of the setuid. 

I think a solution could be to remove the user from the policy and add it 
to the unit file. What do you think?


Rick Mann <rmann at latencyzero.com> schrieb am 16.03.2015 19:05:18:

> Von: Rick Mann <rmann at latencyzero.com>
> An: Jean-Pierre.Bogler at continental-corporation.com, 
> Kopie: dbus at lists.freedesktop.org
> Datum: 16.03.2015 19:05
> Betreff: Re: No core dump on dbus-daemon crash
> 
> User-vs-root or other core dump size limits?
> 
> http://www.akadia.com/services/ora_enable_core.html
> 
> 
> > On Mar 16, 2015, at 09:43 , Jean-Pierre.Bogler at continental-
> corporation.com wrote:
> > 
> > Hello! 
> > 
> > I'm currently hunting a bug where the dbus-daemon (version 1.6.4) 
> sporadically is killed 
> > by a SIGSEGV during system start. Unfortunately, I don't get a 
> core dump when the daemon 
> > is started by the user "messagebus". 
> > 
> > root at imx6x-std:~# echo "/tmp/core" > /proc/sys/kernel/core_pattern 
> > root at imx6x-std:~# dbus-daemon --address=unix:path=/tmp/bla1 --
> config-file=/etc/d 
> > bus-1/system1.conf --nopidfile --fork 
> > root at imx6x-std:~# busybox ps | grep dbus-daemon | head -n 1 
> >  2504 messagebus 2548 S    dbus-daemon --address=unix:path=/tmp/
> bla1 --config-f 
> > root at imx6x-std:~# kill -SEGV 2504 
> > root at imx6x-std:~# ls /tmp/core* 
> > ls: /tmp/core*: No such file or directory 
> > 
> > If I remove "<user>messagebus</user>" from the system(1).conf. The
> crash dumps are written! 
> > Does someone have an idea why it doesn't work with user "messagebus"? 
> > 
> > Best regards 
> > Jean-Pierre 
> > _______________________________________________
> > dbus mailing list
> > dbus at lists.freedesktop.org
> > http://lists.freedesktop.org/mailman/listinfo/dbus
> 
> 
> -- 
> Rick Mann
> rmann at latencyzero.com
> 
> 
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