New subject: [Bug 668878] Kernel crash when trying to mount extended partition with reiserfs option

2 Feb 2011

      https://bugzilla.novell.com/show_bug.cgi?id=668878

https://bugzilla.novell.com/show_bug.cgi?id=668878#c0

           Summary: Kernel crash when trying to mount extended partition
                    with reiserfs option
    Classification: openSUSE
           Product: openSUSE 11.4
           Version: Milestone 6 of 6
          Platform: Other
        OS/Version: Other
            Status: NEW
          Severity: Minor
          Priority: P5 - None
         Component: Kernel
        AssignedTo: jeffm@novell.com
        ReportedBy: trenn@novell.com
         QAContact: qa@suse.de
          Found By: Development
           Blocker: ---

I run into this when trying to run our auto-installation on 11.4.
It's an ugly script trying to mount all partitions from /proc/partitions
unconditionally:
------------
DISKS=$(cat /proc/partitions | awk '{print $4}' | \
    grep -v name | grep -v '^$' | grep -v loop | grep '[0-9]')
ROOT=$(mount | grep ' / ' | cut -d ' ' -f 1)
for partition in ${DISKS} ; do
    partition=/dev/${partition}
    if [ -b ${partition} ] && [ ${partition} != ${ROOT} ] ; then
        if mount -v ${partition} /mnt ; then
            if [ -f /etc/SuSE-release ] && [ -f /mnt/etc/motd ] ; then
                replace_motd /mnt/etc/motd
            fi
            umount /mnt &> /dev/null
        fi
        sleep 1
    fi
done
------------

The crash happens when trying to mount /dev/sda3 (Extended Partition) with
reiserfs. Other tries like vfat, due to no -t option given survive:
mount -v /dev/sda3 /mnt
mount: you didn't specify a filesystem type for /dev/sda3
       I will try all types mentioned in /etc/filesystems or /proc/filesystems
Trying vfat
Trying hfs
Trying minix
Trying reiserfs
-> crash

So I can reproduce the issue doing:
mount -t reiserfs /dev/sda3 /mnt

fdisk -l /dev/sda
..
/dev/sda3         4289355   976768064   486239355   85  Linux extended
/dev/sda5         4289418    23856461     9783522   83  Linux
..

I can workaround the issue and clean up the script.
Still I thought it's worth reporting, the crash does not happen on SLES 11 SP1.
Unfortunately there is no backtrace in the serial logs, a kdump kernel gets
booted, but on the machine I tested kdump does not work as expected, possibly
due to IOMMU being used (bug#668872).

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[Bug 668878] New: Kernel crash when trying to mount extended partition with reiserfs option

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