[Pkg-xfce-devel] Bug#612504: Bug#612504: xfce4-session: Attempted suspend causes logout and segfault

[Yves-Alexis Perez]

On mer., 2011-02-09 at 10:54 -0500, Brandon Simmons wrote:
> On Wed, Feb 9, 2011 at 1:11 AM, Yves-Alexis Perez <corsac at debian.org> wrote:
> > On mar., 2011-02-08 at 18:56 -0500, Brandon Simmons wrote:
> >> As for the backtrace, I'll need some hints on how to do that. I
> >> re-built the 'xfce4-session' package with debugging symbols and
> >> attempted to get a backtrace of "xfce4-session-logout --suspend" per
> >> these instructions:
> >>
> >>     http://wiki.debian.org/HowToGetABacktrace
> >>
> >> but I was instantly logged out of my session. I also tried to dump a
> >> backtrace to a file using this trick:
> >
> > xfce4-session-logout doesn't segfaults, it's xfce4-session. Try to
> > attach it using gdb -p $(pid xfce4-session). You should do it from a
> > console or from ssh since when it'll be killed the session might be
> > frozen.
> 
> I had gdb running in a separate TTY with:
> 
>     $ gdb x-session-manager $(pidof x-session-manager)
> 
> And when I ran in TTY 7
> 
>     $ xfce4-session-logout --suspend
> 
> I got the message "Failed to receive a reply from the session
> manager".

I'd say this is because it was stuck in gdb on tty1.

>  However, after quitting gdb the system immediately suspended
> successfully (and when it came back up it went into suspend again,
> presumably because I had tried the suspend command above twice).

As xfce4-session had segfaulted but not yet quitted (stuck in gdb) its
children weren't killed and in particular the suspend order was
correctly processed. At least that's how I see it.
> 
> At this point suspend seems to be working normally for whatever
> reason. I'm sure it is unrelated to the debugging I just did, but I
> thought I would mention the process I went through, since I haven't
> done anything else with it in the meantime.

Do you mean that it now works even without any gdb debugging?
> 
> One final thing to mention: when suspend stopped working, I was asked
> for my password when I tried to suspend from the GUI logout screen;
> this never happened before. After entering it I was logged out.

That looks like a Consolekit/Policykit issue.
> 
> Anyway thanks for the help in trying to resolve this.

So what's the status right now?

Regards,
-- 
Yves-Alexis