[dm-devel] Re: [2.6.23 PATCH 07/18] dm io: fix panic on large request
Patrick McHardy
kaber at trash.net
Tue Jul 17 17:50:17 UTC 2007
Jun'ichi Nomura wrote:
>>>From: "Jun'ichi Nomura" <j-nomura at ce.jp.nec.com>
>>>
>>>bio_alloc_bioset() will return NULL if 'num_vecs' is too large.
>>>Use bio_get_nr_vecs() to get estimation of maximum number.
>>>
>>>Signed-off-by: "Jun'ichi Nomura" <j-nomura at ce.jp.nec.com>
>>>Signed-off-by: Alasdair G Kergon <agk at redhat.com>
>>>
>>
>>This patch reproducibly oopses my box:
>
>
> Thanks for the report.
> But I'm not sure how the patch is related to the oops.
>
> The stack trace shows the oops occurred in dm-crypt,
> which doesn't use the part of the code modified by the patch
> (dm-io).
I tried reverting the individual patches until it stopped oopsing,
it may have been by luck. I'll try if I can break it again by
reverting the revert.
> Are you using other dm modules such as dm-multipath, dm-mirror
> or dm-snapshot?
> If so, can you take the output of 'dmsetup table' and 'dmsetup ls'?
No other modules.
> Do you have a reliable way to reproduce the oops which I can try?
"/etc/init.d/cryptdisk start" (debian) on a luks partition triggered
it for me.
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