linux-kernel - Re: [BUG 2.6.30+] e100 sometimes causes oops during resume

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Message-Id: <200909230151.36678.rjw@sisk.pl>
Date:	Wed, 23 Sep 2009 01:51:36 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Karol Lewandowski <karol.k.lewandowski@...il.com>
Cc:	david.graham@...el.com,
	"e1000-devel@...ts.sourceforge.net" 
	<e1000-devel@...ts.sourceforge.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [BUG 2.6.30+] e100 sometimes causes oops during resume

On Wednesday 23 September 2009, Karol Lewandowski wrote:
> On Fri, Sep 18, 2009 at 12:27:37AM +0200, Rafael J. Wysocki wrote:
> > On Thursday 17 September 2009, Graham, David wrote:
> > > Rafael J. Wysocki wrote:
> > > > I guess the driver releases its DMA buffer during suspend and attempts to
> > > > allocate it back on resume, which is not really smart (if that really is the
> > > > case).
> 
> > > Yes, we free a 70KB block (0x80 by 0x230 bytes) on suspend and 
> > > reallocate on resume, and so that's an Order 5 request. It looks 
> > > symmetric, and hasn't changed for years. I don't think we are leaking 
> > > memory, which points back to that the memory is too fragmented to 
> > > satisfy the request.
> > > 
> > > I also concur that Rafael's commit 6905b1f1 shouldn't change the logic 
> > > in the driver for systems with e100 (like yours Karol) that could 
> > > already sleep, and I don't see anything else in the driver that looks to 
> > > be relevant. I'm expecting that your test result without commit 6905b1f1 
> > > will still show the problem.
> > > 
> > > So I wonder if this new issue may be triggered by some other change in 
> > > the memory subsystem ?
> 
> > I think so.  There have been reports about order 2 allocations failing for
> > 2.6.31, so it looks like newer kernels are more likely to expose such problems.
> > 
> > Adding linux-mm to the CC list.
> 
> I've hit this bug 2 times since my last email.  Is there anything I
> could do?
> 
> Maybe I should revert following commits (chosen somewhat randomly)?
> 
> 1. 49255c619fbd482d704289b5eb2795f8e3b7ff2e
> 
> 2. dd5d241ea955006122d76af88af87de73fec25b4 - alters changes made by
> commit above
> 
> Any ideas?

You can try that IMO.

Best,
Rafael
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