linux-kernel - Re: ppoll() stuck on POLLIN while TCP peer is sending

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Message-ID: <20130111093049.GL13304@suse.de>
Date:	Fri, 11 Jan 2013 09:30:49 +0000
From:	Mel Gorman <mgorman@...e.de>
To:	Eric Wong <normalperson@...t.net>
Cc:	linux-mm@...ck.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, Rik van Riel <riel@...hat.com>,
	Minchan Kim <minchan@...nel.org>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: ppoll() stuck on POLLIN while TCP peer is sending

On Fri, Jan 11, 2013 at 12:51:05AM +0000, Eric Wong wrote:
> Mel Gorman <mgorman@...e.de> wrote:
> > mm: compaction: Partially revert capture of suitable high-order page
> 
> <snip>
>  
> > Reported-by: Eric Wong <normalperson@...t.net>
> > Cc: stable@...r.kernel.org
> > Signed-off-by: Mel Gorman <mgorman@...e.de>
> 
> Thanks, my original use case and test works great after several hours!
> 
> Tested-by: Eric Wong <normalperson@...t.net>
> 

Thanks very much Eric. I've resent the patch to Andrew so it should make
its way to mainline. It'll fail to apply to 3.7-stable but I should get
a notification from Greg when that happens and fix it up.

> Unfortunately, I also hit a new bug in 3.8 (not in 3.7.x).  based on Eric
> Dumazet's observations, sk_stream_wait_memory may be to blame.
> Fortunately this is easier to reproduce (I've cc-ed participants
> on this thread already): <20130111004915.GA15415@...r.yhbt.net>

It looks like the relevant fix for this has already been written by Eric
Dumazet and picked up by David Miller.

-- 
Mel Gorman
SUSE Labs
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