[lkml]   [2012]   [Dec]   [28]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: 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?

 \ /
  Last update: 2012-12-28 15:21    [W:0.317 / U:0.008 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site