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Date: Fri, 28 Dec 2012 14:43:24 +0100 From: Zlatko Calusic <zlatko.calusic@...on.hr> To: Zhouping Liu <zliu@...hat.com> CC: linux-mm@...ck.org, linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>, Johannes Weiner <jweiner@...hat.com>, mgorman@...e.de, hughd@...gle.com, Andrea Arcangeli <aarcange@...hat.com>, Hillf Danton <dhillf@...il.com>, sedat.dilek@...il.com Subject: Re: BUG: unable to handle kernel NULL pointer dereference at 0000000000000500 On 28.12.2012 10:01, Zhouping Liu wrote: > On 12/28/2012 10:45 AM, Zhouping Liu wrote: >>> Thank you for the report Zhouping! >>> >>> Would you be so kind to test the following patch and report results? >>> Apply the patch to the latest mainline. >> Hello Zlatko, >> >> I have tested the below patch(applied it on mainline directly), >> but IMO, I'd like to say it maybe don't fix the issue completely. > > Hi Zlatko, > > I re-tested it on another machine, which has 60+ Gb RAM and 4 numa nodes, > without your patch, it's easy to reproduce the 'NULL pointer' error, > after applying your patch, I couldn't reproduce the issue any more. > > depending on the above, it implied that your patch fixed the issue. > Yes, that's exactly what I expected. Just wanted to doublecheck this time. Live and learn. ;) > but in my last mail, I tested it on two machines, which caused hung task > with your patch, > so I'm confusing is it your patch block some oom-killer performance? if > it's not, your patch is good for me. > From what I know, the patch shouldn't have much influence on the oom killer, if any. But, as all those subsystems are closely interconnected, both oom & vmscan code is mm after all, there could be some interference. Is the hung-task issue repeatable? -- Zlatko -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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