linux-kernel - Re: [RFC][PATCH] Fix lock inversion aio_kick

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Date:	Thu, 09 Nov 2006 14:51:59 -0800
From:	Zach Brown <zach.brown@...cle.com>
To:	Jeff Moyer <jmoyer@...hat.com>
CC:	Benjamin LaHaise <bcrl@...ck.org>, linux-kernel@...r.kernel.org,
	linux-aio@...ck.org, Arjan van de Ven <arjan@...radead.org>
Subject: Re: [RFC][PATCH] Fix lock inversion aio_kick_handler()


> Zach> > Doh.  Unfortunately, this patch isn't entirely correct as it
> Zach> could race with > __put_ioctx() which sets ioctx->mm = NULL.
> 
> Zach> Aha, yeah, that's what I was missing.  Thanks.
> 
> Zach> > Something like the following should do the trick:
> 
> Zach> Cool, I'll respin and send it out.
> 
> Did you ever resend this patch, Zach?

Sadly, no.  I vaguely remember thinking that the refcounting was pretty
messed up in these paths and that more than just this patch was needed.
 I don't remember the details.

Maybe I should take a look again :/.

> current kernels.  I'm still running into the lockdep warnings.

When doing what?  Working with that IO_CMD_EPOLL_WAIT patch?

- z
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