Re: What am I doing wrong? submit_bio() suddenly stops working...

[Ted Ts'o]

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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