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SubjectRe: [BUG] usb-storage: Error in queuecommand: us->srb = ffff88006a338480
On Thu, 30 Oct 2008 17:35:57 -0400
Brian Kysela <bkysela@gmail.com> wrote:

> On kernels ranging from 2.6.26 - 2.6.28-rc2

So 2.6.25 was OK?

> on an Intel P4 3.2GHz HT x86-64
> cpu, I am seeing a bug that occurs about half the time when copying ~300MB
> data from a usb flash drive (FAT) to hard drive (XFS). There are three
> possible outcomes, so far, when I hit the bug:
>
> (1) The copy process hangs, cpu wait hits 100% and load avg climbs until
> reboot;
> (2) The copy process hangs and then recovers and then one of:
> (a) the cpu wait & load avg both decline to normal; or
> (b) cpu wait hovers at 100% and the load avg slowly climbs until reboot;
> (3) Kernel bug reported and machine locks up.
>
> Result (1) is the most frequent. Result (3) happened only twice out of about 40
> tests. I lose the full traces, but here are two relevant lines that I see on
> screen before the machine locks up:
>
> kernel BUG at /home/brian/linux-2.6/block/elevator.c:841!
> invalid opcode: 0000 [#1] PREMPT SMP

It is unclear what kernel version produced that message, and that is
important information. In 2.6.28-rc2, block/elevator.c:841 is

void elv_dequeue_request(struct request_queue *q, struct request *rq)
{
-->> BUG_ON(list_empty(&rq->queuelist));
BUG_ON(ELV_ON_HASH(rq));

please confirm that I have the correct line there.


I assume that you're hitting a bug in the USB storage code and this is
triggering consistency-checking code in the block layer.

> When (1) or (2b) occurs I pull the usb drive to see what happens. In two cases
> (3) occurred, but more often I get this in /var/log/syslog:

The other things you saw were most likely a consequence of the
BUG_ON().



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