Date: Sun, 11 Nov 2001 20:45:58 -0800 From: John Merryweather Cooper <john_m_cooper@yahoo.com> To: Joe Clarke <marcus@marcuscom.com> Cc: freebsd-stable@freebsd.org Subject: Re: Problem with Gnome apps crashing on -stable Message-ID: <20011111204558.C717@johncoop.MSHOME> In-Reply-To: <20011111230137.V59304-100000@shumai.marcuscom.com>; from marcus@marcuscom.com on Sun, Nov 11, 2001 at 20:12:04 -0800 References: <20011111230137.V59304-100000@shumai.marcuscom.com>
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On 2001.11.11 20:12 Joe Clarke wrote:
> I'm seeing something strange with certain Gnome apps on -stable. At
> first
> it was just happening with nautilus, so I ignored it. Now, the same
> thing
> happens with balsa. I've been trying to track down the problem, but I
> need some help. When I open my home directory in nautilus (which has
> a
> lot of files), I noticed this on my console:
>
> sigreturn: eflags 0x10296
>
> Then a core dump on signal 6. The eflags value is different each
> time.
> This message comes from machdep.c in the kernel. It seems to indicate
> that the user process is trying to set eflags and (eflags & PSL_VM) is
> not
> true. My first question is, what exactly is eflags? Is this caused
> by
> someone not saving context correctly?
>
> Now, when this happens, the SIGABRT is caused by uthread_kern.c which
> is
> evident in my .gnomerc-errors file:
>
> Fatal error 'Thread has returned from sigreturn or longjmp' at line ?
> in
> file /usr/src/lib/libc_r/uthread/uthread_kern.c (errno = ?)
> Abort trap - core dumped
>
> The relevant code from uthread_kern.c seems to be:
>
> /*
> * Ensure the process signal mask is set
> * correctly:
> */
> _thread_run->ctx.uc.uc_sigmask =
> _process_sigmask;
> sigreturn(&_thread_run->ctx.uc);
> #endif
> break;
> }
> /* This point should not be reached. */
> PANIC("Thread has returned from sigreturn or longjmp");
>
> Line 607 was changed three weeks ago from:
>
> _thread_sys_sigreturn(&_thread_run->ctx.uc);
>
> to what you see above. I'm not sure this has any bearing on the
> problem,
> though. Balsa 1.2.3 has started doing the same thing at times. I
> have
> -stable cvsup'd and compiled from yesterday (11/10/2001), and all the
> latest components having anything to do with gnome.
>
> Like I said, I'd love to track this down, but I need some guidance as
> I'm
> not that familiar with kernel threading. Thanks.
>
> Joe
>
I've seen this too. I would add that I've even seen it happen
spontaneously (while xscreensaver has the root window) with the result
that the whole X window session comes crashing down. I'm also
consistently seeing warning being issued concurrent with the eflags
discussed above relating to calls to free() for blocks that are already
freed.
A wild guess is that something isn't quite right in ORBit/oaf?
--
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