Bug#589088: libgnomevfs2-0: gnome-vfs-daemon segfault causes gnome session to hang during login

[Jon Jackson]

On Wed, Jul 21, 2010 at 2:32 PM, Jon Jackson <jsjweb at familyjackson.net>wrote:

>
>
> On Mon, Jul 19, 2010 at 12:29 PM, Josselin Mouette <joss at debian.org>wrote:
>
>> Le mercredi 14 juillet 2010 à 15:55 -0400, Jonathan Jackson a écrit :
>> > On a Debian Lenny installation that has performed well for 6+ months,
>> gnome sessions now hang during logon for all
>> > system users. This is after the desktop background and panels appear,
>> but before any desktop icons or panel
>> > icons/menus are visible.  KDE sessions are fine.
>> >
>> > the last entry in ~/.xsession errors is "Initializing gnome-mount
>> extension"
>> >
>> > /var/log/messages indicates the following errors coinciding with the
>> session hang:
>> >
>> > Jul 14 15:27:39 genova kernel: [  661.024456] gnome-vfs-daemo[15293]:
>> segfault at 0 ip 00007fc8584ceaf2 sp 00007fffc43cc3f8 error 4 in
>> libc-2.7.so[7fc858454000+14a000]
>> [etc.]
>>
>> Thanks for your report.
>>
>> Unfortunately we need a backtrace of the crash to understand what is
>> happening. See http://wiki.debian.org/HowToGetABacktrace
>>
>>
> Ok, so I've generated a trace following the instructions on the wiki page,
> thanks.
>
> $ gdb /usr/lib/gnome-vfs-2.0/gnome-vfs-daemon
> GNU gdb 6.8-debian
> Copyright (C) 2008 Free Software Foundation, Inc.
> License GPLv3+: GNU GPL version 3 or later <
> http://gnu.org/licenses/gpl.html>
> This is free software: you are free to change and redistribute it.
> There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
> and "show warranty" for details.
> This GDB was configured as "x86_64-linux-gnu"...
> (gdb) set pagination 0
> (gdb) run
> Starting program: /usr/lib/gnome-vfs-2.0/gnome-vfs-daemon
> [Thread debugging using libthread_db enabled]
> [New Thread 0x7fa61029f6e0 (LWP 22354)]
>
> (process:22354): libgnomevfs-CRITICAL **:
> gnome_vfs_get_uri_from_local_path: assertion `g_path_is_absolute
> (local_full_path)' failed
>
> (process:22354): libgnomevfs-CRITICAL **:
> gnome_vfs_get_uri_from_local_path: assertion `g_path_is_absolute
> (local_full_path)' failed
>
> Program received signal SIGSEGV, Segmentation fault.
> [Switching to Thread 0x7fa61029f6e0 (LWP 22354)]
> 0x00007fa60ea8caf2 in strcmp () from /lib/libc.so.6
> (gdb) bt
> #0  0x00007fa60ea8caf2 in strcmp () from /lib/libc.so.6
> #1  0x000000000040e530 in
> _gnome_vfs_volume_monitor_find_mtab_volume_by_activation_uri
> (volume_monitor=<value optimized out>, activation_uri=0x0) at
> gnome-vfs-volume-monitor.c:673
> #2  0x000000000040cc2c in update_fstab_drives
> (volume_monitor_daemon=0x19f3280) at gnome-vfs-volume-monitor-daemon.c:708
> #3  0x000000000040df2e in gnome_vfs_volume_monitor_daemon_init
> (volume_monitor_daemon=0x19f3280) at gnome-vfs-volume-monitor-daemon.c:191
> #4  0x00007fa60f275fa5 in g_type_create_instance () from
> /usr/lib/libgobject-2.0.so.0
> #5  0x00007fa60f25a7ab in ?? () from /usr/lib/libgobject-2.0.so.0
> #6  0x00007fa60f25b5d2 in g_object_newv () from
> /usr/lib/libgobject-2.0.so.0
> #7  0x00007fa60f25c327 in g_object_new_valist () from
> /usr/lib/libgobject-2.0.so.0
> #8  0x00007fa60f25c46c in g_object_new () from /usr/lib/libgobject-2.0.so.0
> #9  0x000000000040f071 in _gnome_vfs_get_volume_monitor_internal (create=1)
> at gnome-vfs-volume-monitor.c:446
> #10 0x0000000000407b6e in main (argc=<value optimized out>, argv=<value
> optimized out>) at vfs-daemon.c:945
>
>
>
I've followed this up based on 'clue' given by
(_gnome_vfs_volume_monitor_find_mtab_volume_by_activation_uri ) and found
this has been also been reported in Ubuntu
https://bugs.launchpad.net/ubuntu/+source/gnome-vfs2/+bug/85477
and upstream
https://bugzilla.gnome.org/show_bug.cgi?id=408553

And it appears to be related to parsing /etc/fstab

Looking at my /etc/fstab for anything unusual, I had an entry

UUID=A86EF81A6EF7DECE windows   ntfs    noauto,user,umask=227 0 0

which is valid in the sense that I mounted the file system without problems
cd /mnt
sudo mount windows

however the mount point is not a proper full path. Changing the mount point
to /mnt/windows fixes the segfault in gnome-vfs-daemon and gnome sessions
are working again. I'll post a comment also upstream

Thanks for recommending a backtrace as this was key to finding a solution,
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