On Mon, 2006-10-23 at 18:11 +0200, Allard Hoeve wrote: > Dear LVM maintainers, > > (JFS maintainer CC'ed because of crash on LVM + JFS) > > Today I encountered a kernel oops while resizing one of our logical volumes. > Others at the office have encountered this oops before, but until now I haven't > had the chance to get to the oops message itself. > > A short description of the machine: > > * The machine is a Dell PowerEdge 2850 (megaraid_mbox 4e/Di SCSI) > * There are 6 disks in a RAID5 setup (one large logical disk) > * The machine had medium load overall > * The machine had low load on the partition to be resized > > Output of lsmod and lspci -vv attached. > > Description of the setup: > > * The machine was running a vanilla Linux 2.6.17.8 > * The machine was running Debian Sarge (lvm2 2.01.04-5) > * 80% of the RAID5 array covered by LVM2 > * One volume group > * Five logical volumes > > About the crash: > > * I was using lvextend -L +100G /dev/srv/home > * Oops happend during resize > * The partition in question had a JFS filesystem > * Resizing the largest logical volume > * Resizing from 150 to 250 GB > * Partition was mounted read/write (online) > * Two other resizes had finished succesfully happened before > the kernel oops occurred It looks like lbmRead() (jfs) called submit_bio() where bio->bi_bdev is NULL. I don't know how this can be happening, and it doesn't look like anything I've seen before. I didn't see any lv's that appear to be an external journal, so I'm assuming the partition has an internal journal. > After a reboot: > > * Second attempt at lvresize succeeded after reboot > * mount -o remount,resize of filesystem succeeded > > It seems like this bug is only triggered on consecutive resize attempts, but I > cannot confirm this. I'll look a bit closer to see if I can find any way multiple resizes might lead to a null bdev somewhere. > Output of vgs and lvs attached (unfortunately only of the new situation) > > The oops itself: > > See attached file. Please note the NULL pointer and memory allocation function > references. > > I hope this information is complete. If you require any more information about > this, please don't hesitate to contact me. If you do, please CC me, I'm not on > any of the LVS lists. > > Thanks for your time, > > > Sincerely, > > Allard Hoeve -- David Kleikamp IBM Linux Technology Center _______________________________________________ linux-lvm mailing list linux-lvm@redhat.com https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
