linux-ext4 - Re: Null pointer deref in do_aio

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Date:	Fri, 10 Feb 2012 13:06:32 -0500
From:	Jeff Moyer <jmoyer@...hat.com>
To:	Sage Weil <sage@...dream.net>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: Null pointer deref in do_aio_submit

Sage Weil <sage@...dream.net> writes:

> I hit the following under a reasonable simple aio workload:
>
>  - reasonably heavy load
>  - lots of threads doing buffered io to random files
>  - one thread submitting O_DIRECT aio to a single file (journal), all 
>    sequential (wrapping), 100MB
>  - probably somewhere between 1 and 50 aios outstanding at any point in 
>    time.
>
> The kernel was v3.2 mainline, plus unrelated btrfs and ceph patches.
>
> Is this a known issue?  Any other information that would be helpful?

I don't know for sure, but could you test with the following commit?
69e4747ee9727d660b88d7e1efe0f4afcb35db1b

Also, I'll note that it looks like you are doing O_SYNC + O_DIRECT AIO.
I'm curious to know what apps use that particular combination.  Is this
just a test case, or do you have an app which does this in production?

Cheers,
Jeff
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