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

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.

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