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Subjectlibata badness
Hi all,

I'm running a raid5 array atop a few sata drives via a promise tx4
controller. The kernel is the official fedora lk 2.6.8-1, although I had
run a few different kernels (never entirely successfully) with this array
in the past.

In fact, this past weekend, I was getting oopses and panics (on lk, 2.6.9-rc3, 2.6.9-rc3-mm1, and 2.6.9-rc3 w/ Jeff Garzik's recent
libata patches) all of which happened when rebuilding a spare drive in the
array. Unfortunately, somehow my root filesystem (ext3) got blown away--
it was on a reliable scsi drive (no bad blocks; I checked afterwards), and
an adaptec aic7xxx host. The ram was good; I ran memtest86 on it. I'm
assuming this was caused by some major kernel corruption, originating from

I have since rebuilt my computer using an AMD Sempron (basically a Duron)
rather than a P4. Other than that (cpu + m/b), it's the same hardware.

The errors I got over the weekend are similar to the one I just captured
on my fresh fc2/lk2.6.8-1 install (at the same point; the spare disk had
begun rebuilding). It's attached below.

Anyway, I haven't been able to find any other reports of this, so I'm at a
loss about what to do. I hesitate to bring my array up at all now, for
fear of blowing it away. Any assistance would be greatly appriciated.

Thanks much,

---------- SNIP ----------
Unable to handle kernel paging request at virtual address 01000004
printing eip:
*pde = 00000000
Oops: 0000 [#1]
Modules linked in: raid5 xor sata_promise md5 ipv6 parport_pc lp parport
autofs4 sunrpc sk98lin sg joydev dm_mod uhci_hcd ehci_hcd button battery
asus_acpi ac ext3 jbd sata_via libata aic7xxx sd_mod scsi_mod
CPU: 0
EIP: 0060:[<229e4d8c>] Not tainted
EFLAGS: 00010206 (2.6.8-1.521)
EIP is at handle_stripe+0x29a/0x1407 [raid5]
eax: 00000001 ebx: 00000000 ecx: 00915cb8 edx: 21f7e1c0
esi: 1ccbd118 edi: 21f7e1c0 ebp: 01000000 esp: 1d300f28
ds: 007b es: 007b ss: 0068
Process md0_raid5 (pid: 2626, threadinfo=1d300000 task=1d317970)
Stack: 2283eb57 20db8000 21f7e1c0 21c30288 1ccbd204 20db8000 00000001
00000002 00000000 00000000 00000001 00000000 00000000 00000001
00000001 00000001 00000000 00000003 1ccbd0ac 21f7e1c0 1ccbd0ac
Call Trace:
[<2283eb57>] ata_scsi_queuecmd+0xbe/0xc7 [libata]
[<229e6b1c>] raid5d+0x1ce/0x2f8 [raid5]
[<0228f5d2>] md_thread+0x227/0x256
[<0211be05>] autoremove_wake_function+0x0/0x2d
[<0211be05>] autoremove_wake_function+0x0/0x2d
[<0228f3ab>] md_thread+0x0/0x256
[<021041d9>] kernel_thread_helper+0x5/0xb
Code: 8b 55 04 83 c1 08 8b 45 00 83 d3 00 39 da 72 0e 0f 87 e0 01
---------- SNIP ----------

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