Kernel panic with mdadm 3.1.4 on Ubuntu Lucid 64-bit

Hi all,

I am seeing an occassional kernel panic when running "mdadm -S
/dev/md0" to stop a RAID 5 array that is syncing. The
/var/log/messages snip-it is below. My system is a VMware Ubuntu 10.04
(Lucid) 64-bit VM, with mdadm 3.1.4 instead of the stock version in
Ubuntu. I have no additional mdadm nor kernel patches.

I have 11 virtual hard drives in my VM, and I am using 9 as active
drives and 2 as spares. Chunk size is 64K.

The issue is tough to duplicate but if I create the md array, and then
mdadm -S it, and then recreate it again, and do this sequence in rapid
succession, I can sometimes make this kernel panic happen.

Dec 18 14:08:33 localhost kernel: [ 1077.948456] mdadm D
0000000000000000 0 12873 12872 0x00000000
Dec 18 14:08:33 localhost kernel: [ 1077.948463] ffff880052201a68
0000000000000082 0000000000015bc0 0000000000015bc0
Dec 18 14:08:33 localhost kernel: [ 1077.948469] ffff8800418a1a98
ffff880052201fd8 0000000000015bc0 ffff8800418a16e0
Dec 18 14:08:33 localhost kernel: [ 1077.948473] 0000000000015bc0
ffff880052201fd8 0000000000015bc0 ffff8800418a1a98
Dec 18 14:08:33 localhost kernel: [ 1077.948478] Call Trace:
Dec 18 14:08:33 localhost kernel: [ 1077.948504] []
schedule_timeout+0x22d/0x300
Dec 18 14:08:33 localhost kernel: [ 1077.948510] []
wait_for_common+0xd6/0x180
Dec 18 14:08:33 localhost kernel: [ 1077.948518] []
? ifind_fast+0x58/0xb0
Dec 18 14:08:33 localhost kernel: [ 1077.948529] []
? default_wake_function+0x0/0x20
Dec 18 14:08:33 localhost kernel: [ 1077.948542] []
? sysfs_drop_dentry+0x139/0x160
Dec 18 14:08:33 localhost kernel: [ 1077.948548] []
wait_for_completion+0x1d/0x20
Dec 18 14:08:33 localhost kernel: [ 1077.948553] []
sysfs_addrm_finish+0x118/0x150
Dec 18 14:08:33 localhost kernel: [ 1077.948578] []
sysfs_hash_and_remove+0x5b/0x80
Dec 18 14:08:33 localhost kernel: [ 1077.948583] []
sysfs_remove_group+0x5f/0x100
Dec 18 14:08:33 localhost kernel: [ 1077.948596] []
stop+0x61/0x80 [raid456]
Dec 18 14:08:33 localhost kernel: [ 1077.948607] []
do_md_stop+0xdd/0x560
Dec 18 14:08:33 localhost kernel: [ 1077.948620] []
? apparmor_capable+0x31/0xa0
Dec 18 14:08:33 localhost kernel: [ 1077.948626] []
md_ioctl+0x514/0x7f0
Dec 18 14:08:33 localhost kernel: [ 1077.948630] []
? default_wake_function+0x12/0x20
Dec 18 14:08:33 localhost kernel: [ 1077.948636] []
? find_get_page+0x1e/0xa0
Dec 18 14:08:33 localhost kernel: [ 1077.948640] []
? filemap_fault+0x8b/0x450
Dec 18 14:08:33 localhost kernel: [ 1077.948646] []
? mem_cgroup_update_mapped_file_stat+0x2d/0x90
Dec 18 14:08:33 localhost kernel: [ 1077.948652] []
__blkdev_driver_ioctl+0x27/0x80
Dec 18 14:08:33 localhost kernel: [ 1077.948656] []
blkdev_ioctl+0x1ed/0x6f0
Dec 18 14:08:33 localhost kernel: [ 1077.948661] []
block_ioctl+0x3c/0x40
Dec 18 14:08:33 localhost kernel: [ 1077.948667] []
vfs_ioctl+0x22/0xa0
Dec 18 14:08:33 localhost kernel: [ 1077.948671] []
do_vfs_ioctl+0x81/0x410
Dec 18 14:08:33 localhost kernel: [ 1077.948676] []
? do_page_fault+0x153/0x3b0
Dec 18 14:08:33 localhost kernel: [ 1077.948680] []
sys_ioctl+0x81/0xa0
Dec 18 14:08:33 localhost kernel: [ 1077.948687] []
system_call_fastpath+0x16/0x1b


Thank you in advance for any guidance!
-Tommy
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