Re: [BUG] BUG_ON in I/O scheduler, bugme # 288
Jens Axboe (axboe@suse.de)
Fri, 24 Jan 2003 08:50:01 +0100
On Thu, Jan 23 2003, Dave Olien wrote:
>
> Jens, Andrew
>
> The group here doing dbt2 workload measurements have hit a couple of
> problems APPARENTLY in the block I/O scheduler when doing write-intensive
> raw disk I/O through a DAC960 extremeraid 2000 controller.
> This wasn't a problem in 2.5.49. It has appeared since then.
>
> I've filed a bug on the OSDL bugme database. You can read it at:
>
> http://bugme.osdl.org/show_bug.cgi?id=288
>
> I've also put a more complete report in my web site:
>
> http://www.osdl.org/archive/dmo/deadline_bugon.
A request got on the fifo, but not in the sort tree. This is most likely
an alias. Ah yes I see it, it can happen when two requests are merged.
I'll be back with a fix for this soon.
--
Jens Axboe
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