[sr-dev] SER crash : Segmentation fault

[Andrei Pelinescu-Onciul]

On Oct 12, 2009 at 10:54, inge <inge at legos.fr> wrote:
> A command issued by the FIFO can lead to a restart of how we see in the
> logs "messages" ?

If "kill" is sent over the fifo, you will see only one of the DBG()s:
"SIGTERM received, program terminates". Note that you will see it in the
log only if debug>4, or if you replace it with a LOG(L_CRIT, ...).

Andrei

> 
> Le lundi 12 octobre 2009 ?? 10:47 +0200, Andrei Pelinescu-Onciul a
> ??crit :
> > On Oct 12, 2009 at 09:57, inge <inge at legos.fr> wrote:
> > > Hello Andrei,
> > > 
> > > Thank for having replied.
> > > 
> > > SER runs as root user without anything in the config file concerning a
> > > "-u" option, even in a "ps aux", all the process are started without
> > > options.
> > > 
> > > We have checked and it seems that no one shoot the process at the time
> > > crash happened.
> > > 
> > > I attached to this email the /var/log/messages. As you will see, we just
> > > received a "signal 15".
> > 
> > If it would have been a process that crashed or exited (which would be
> > another bug), you would have in the log one of the following lines:
> > child process %d exited normally, status=
> > child process %d exited by a signal 
> > child process %d stopped by a  signal
> > 
> > After that you would have another line:
> > INFO: terminating due to SIGCHLD
> > 
> > (see main.c:506 , in handle_sigs()).
> > 
> > The log fragment you sent, shows that log messages with L_INFO are
> > printed (so debug>=L_INFO) => you should see one of the above lines.
> > 
> > If you don't see them the only explanation is that someone or some other
> > program sent a SIGTERM or SIGINT to it.
> > There is a message printed any time the main program gets a SIGTERM, but
> > its printed only on high debug levels. You could try either increasing
> > the debug level (,e.g. debug=5, but then you'll have a _lot_ logged) or
> > changing
> >  main.c:478: DBG("SIGTERM received, program terminates\n"); to
> >   LOG(L_CRIT, "SIGTERM received, program terminates\n"); 
> >   and main.c:476    DBG("INT received, program terminates\n");
> > to LOG(L_CRIT, "INT received, program terminates\n");.
> > 
> > This way if it happens a second time you'll at least see if the main
> > process was manually killed (which is the only explanation I can offer).
> > 
> > Andrei