oops, 2.6.15.4 + qla1280+md+xfs+quota

[Chris Stromsoe <cbs@cts.ucla.edu>]

I have a 2.6.15.4 system that was running fine.  Internal drives are using 
the Fusion MPT driver.  I have two external JBODs with 12 disks each. 
Each JBOD has two channels, 6 disks per channel, and each channel is 
connected to a QLogic ISP 10160 controller.

Each of the JBODs is built as an md raid5 (md1 and md2).  Both raid5s are 
mirrored (md3).  I had an ext3 filesystem running fine.

I unmounted md3, ran "mkfs.xfs /dev/md3 && mount /dev/md3" and the system 
hung.  md is built in, qla1280 and xfs are both modules.  mount options in 
fstab are rw, quota, noatime -- possibly also noexec and nosuid, but I 
don't think they were enabled.  XFS is built with XFS quota support; I've 
tried also with and without generic quota support.  4K stacks are enabled, 
if that matters.  Full .config and dmesg output are at 
http://hashbrown.cts.ucla.edu/pub/oops-200602/ (config is with generic 
quota, dmesg has xfs loaded as a module and /dev/md3 mounted without quota 
set).

I added "defaults" and removed "quota" from fstab for /dev/md3 and 
was able to mount the partition normally.

It's not responsive to sysrq on the serial console. The last output 
(without generic quota) was:

XFS mounting filesystem md3
XFS quotacheck md3: Please wait.
Unable to handle kernel paging request at virtual address 00100178
 printing eip:
c0114f5a
*pde = 00000000
Oops: 0000 [#1]
SMP
Modules linked in: xfs e1000 bonding qla1280 st
CPU:    0
EIP:    0060:[<c0114f5a>]    Not tainted VLI
EFLAGS: 00010006   (2.6.15.4)
EIP is at do_page_fault+0x93/0x545
eax: eb7ac000   ebx: 00000001   ecx: 0000007b   edx: 00100100
esi: 000001ff   edi: c0114ec7   ebp: eb7ac0e8   esp: eb7ac094
ds: 007b   es: 007b   ss: 0068
Unable to handle kernel paging request at virtual address 00100178
 printing eip:
Unable to handle kernel paging request at virtual address 00100178
 printing eip:
Unable to handle kernel NULL pointer dereference at virtual address 
00000078
 printing eip:
Unable to handle kernel paging request at virtual address 00100178
 printing eip:
Unable to handle kernel paging request at virtual address 00100178
 printing eip:
Unable to handle kernel paging request at virtual address 00100178
 printing eip:
Unable to handle kernel paging request at virtual address bebaee76
 printing eip:
Unable to handle kernel paging request at virtual address 00100178
 printing eip:
Unable to handle kernel paging request at virtual address bebaee76
 printing eip:
Unable to handle kernel paging request at virtual address 00100178
 printing eip:
Unable to handle kernel paging request at virtual address 00100178
 printing eip:
Unable to handle kernel paging request at virtual address 00100178
 printing eip:
Unable to handle kernel paging request at virtual address 00100178
 printing eip:
Unable to handle kernel paging request at virtual address 00100178
 printing eip:
Unable to handle kernel paging request at virtual address 00100178
 printing eip:
Unable to handle kernel paging request at virtual address 00100178
 printing eip:


As soon as I mount the partition with quota in fstab, the machine hangs. 
The oops is not always the same.  During one test run, I saw a number of 
"BUG: soft lockup detected on CPU#0" errors.  The above oops is the only 
one I managed to capture.



-Chris
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