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

Mel Gorman
2013-01-11T09:30:53Z

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