Messages in this thread | | | Date | Fri, 28 Dec 2012 14:43:24 +0100 | From | Zlatko Calusic <> | Subject | Re: BUG: unable to handle kernel NULL pointer dereference at 0000000000000500 |
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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
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