linux-kernel - Re: What am I doing wrong? submit

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Message-ID: <20101021212934.GI3127@thunk.org>
Date:	Thu, 21 Oct 2010 17:29:34 -0400
From:	Ted Ts'o <tytso@....edu>
To:	Jens Axboe <axboe@...nel.dk>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>
Subject: Re: What am I doing wrong?  submit_bio() suddenly stops working...

On Thu, Oct 21, 2010 at 07:46:15PM +0200, Jens Axboe wrote:
> By the sound of things, if I were you I'd turn on the mem and slab
> debugging to catch use-before-init and use-after-free. Mysterious hangs
> in the IO sub system are usually caused by such bugs. And the regular
> debugging aids, just to see if that produces anything of interest.

I've tried turning on slub_debug=FZP, and that didn't turn up
anything.

Looking at the traces, it looks like the queue gets plugged near the
end, but then I don't see an unplug timer event.  I'm not sure what
could cuase that, though...

						- Ted
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