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> Date: Wed, 26 Jan 2011 16:55:45 +0000
> From: <email address hidden>
> To: <email address hidden>
> Subject: [Bug 579858] Re: umount segfault on shutdown when unmounting autofs	mountpoint
> 
> ** Branch linked: lp:ubuntu/util-linux
> 
> -- 
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> ubuntu-10.04.2.
> https://bugs.launchpad.net/bugs/579858
> 
> Title:
>   umount segfault on shutdown when unmounting autofs mountpoint
> 
> Status in “util-linux” package in Ubuntu:
>   Fix Released
> Status in “util-linux” source package in Lucid:
>   Fix Committed
> Status in “util-linux” source package in Maverick:
>   Triaged
> Status in “util-linux” source package in Natty:
>   Fix Released
> 
> Bug description:
>   Binary package hint: autofs5
> 
>   After I started using autofs5 in lucid I got filesystem checks on every boot up on my seperated /boot and /home partitions. They were not cleanly unmounted.
>   I tried to research why:
>   On shutdown /etc/init.d/umountfs calls umount to unmount filesystems it reads from /proc/mounts. Several Vars are created by the script and unmounted then. I modified the script to get the vars content.
> 
>   PROTECTED_MOUNTS rootfs / rootfs rw 0 0 none /sys sysfs rw,nosuid,nodev,noexec,relatime 0 0 none /proc proc rw,nosuid,nodev,noexec,relatime 0 0 none /dev devtmpfs rw,relatime,size=1988516k,nr_inodes=497129,mode=755 0 0 none /dev/pts devpts rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000 0 0 /dev/mapper/lvm_vg-root / ext4 rw,noatime,errors=remount-ro,barrier=1,data=ordered 0 0
>   WEAK_MTPTS /sys/kernel/security /sys/kernel/debug /sys/fs/fuse/connections
>   REG_MTPTS  /home/flo/.gvfs /mnt/autofs /boot /home
>   TMPFS_MTPTS /tmp
> 
>   The problematic line is REG_MTPTS. The call to umount finally looks like this:
>   fstab-decode umount -f -v -r -d $REG_MTPTS
>   which expands to (in my case)
>   fstab-decode umount -f -v -r -d  /home/flo/.gvfs /mnt/autofs /boot /home
> 
>   When hiding plymouth screen at shutdown, I got a glimpse on a Segfault
>   message, after the umounting outputs.
> 
>   The segfault occurs when trying to unmount /mnt/autofs, so /boot and
>   /home never get unmounted and are unclean on next boot. So thats the
>   reason for the symptom.
> 
>   I further tried to unmount /mnt/autofs with gdb to trace the problem.
>   The segfault happens in strlen and is 100% reproducable. See the
>   output file attached.
> 
>   When i stop the autofs daemon before trying to unmount /mnt/autofs,
>   everything is fine, since the daemon removes the mountpoint anyways
>   when exiting.
> 
>   So there may be two problems/solutions:
>   First: Why does umount segfault?
>   And: Is autofs not correctly stoped by upstart, and isn't that the real problem/solution? If autofs daemon would be stopped before executing umountfs, it wouldn't try to unmount the autofs mountpoint.
> 
>   Additional attachments: output of: cat /proc/mounts, auto.* files
> 
>   ProblemType: Bug
>   DistroRelease: Ubuntu 10.04
>   Package: autofs5 (not installed)
>   ProcVersionSignature: Ubuntu 2.6.32-22.33-generic 2.6.32.11+drm33.2
>   Uname: Linux 2.6.32-22-generic x86_64
>   Architecture: amd64
>   Date: Thu May 13 10:40:16 2010
>   ProcEnviron:
>    PATH=(custom, user)
>    LANG=en_US.utf8
>    SHELL=/bin/bash
>   SourcePackage: autofs5
> 
>