* Hard lockup with ata_piix 2.6.21.1: strange traceback, too
@ 2007-06-20 21:12 Mark Lord
2007-06-21 4:29 ` Tejun Heo
0 siblings, 1 reply; 2+ messages in thread
From: Mark Lord @ 2007-06-20 21:12 UTC (permalink / raw)
To: Tejun Heo, Jeff Garzik, Alan Cox, IDE/ATA development list
Hi guys,
I'm debugging a system here based on ICH7/ata_piix.
When we hot-pull a drive, it locks up solid.
That's fine, but I'd like to find/fix the lockup.
So as part of poking around, I rebuilt the kernel with frame pointers,
and inserted a WARN_ON(1) into ata_busy_sleep() to see who was calling it
just before things locked up.
Here's the result: http://rtr.ca/libata.png
Can anyone here make sense of that traceback??
Are we *really* recursing inside the EH code?
Thanks
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: Hard lockup with ata_piix 2.6.21.1: strange traceback, too
2007-06-20 21:12 Hard lockup with ata_piix 2.6.21.1: strange traceback, too Mark Lord
@ 2007-06-21 4:29 ` Tejun Heo
0 siblings, 0 replies; 2+ messages in thread
From: Tejun Heo @ 2007-06-21 4:29 UTC (permalink / raw)
To: Mark Lord; +Cc: Jeff Garzik, Alan Cox, IDE/ATA development list
Mark Lord wrote:
> Hi guys,
>
> I'm debugging a system here based on ICH7/ata_piix.
> When we hot-pull a drive, it locks up solid.
> That's fine, but I'd like to find/fix the lockup.
>
> So as part of poking around, I rebuilt the kernel with frame pointers,
> and inserted a WARN_ON(1) into ata_busy_sleep() to see who was calling it
> just before things locked up.
> Here's the result: http://rtr.ca/libata.png
>
> Can anyone here make sense of that traceback??
> Are we *really* recursing inside the EH code?
It looks like SCSI EH -> piix_sata_error_handler -> ata_eh_recover ->
ata_std_softreset -> ata_std_prereset -> ata_busy_sleep with lots of
bogus entries inbetween.
--
tejun
^ permalink raw reply [flat|nested] 2+ messages in thread
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2007-06-20 21:12 Hard lockup with ata_piix 2.6.21.1: strange traceback, too Mark Lord
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