Messages in this thread |  | | Date | Mon, 16 Jun 2008 12:29:08 +0200 | From | Patrick McHardy <> | Subject | Re: 2.6.26-git: NULL pointer deref in __switch_to |
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Simon Holm Th������������������������ wrote: > fre, 13 06 2008 kl. 15:47 -0700, skrev Suresh Siddha: >> On Fri, Jun 13, 2008 at 11:24:01AM -0700, Vegard Nossum wrote: >>> On Fri, Jun 13, 2008 at 7:42 PM, Patrick McHardy <kaber@trash.net> wrote: >>>> I get this oops once a day, its apparently triggered by something >>>> run by cron, but the process is a different one each time. >>>> >>>> Kernel is -git from yesterday shortly before the -rc6 release >>>> (last commit is the usb-2.6 merge, the x86 patches are missing), >>>> .config is attached. >>>> >>>> I'll retry with current -git, but the patches that have gone in >>>> since I last updated don't look related. >>>> >>> Thanks for the report. >>> >>>> [62060.043009] BUG: unable to handle kernel NULL pointer dereference at >>>> 000001ff >>>> [62060.043009] IP: [<c0102a9b>] __switch_to+0x2f/0x118 >>>> [62060.043009] *pde = 00000000 >>>> [62060.043009] Oops: 0002 [#1] PREEMPT >> Patrick, Do you see any other error messages before this BUG stmt? Can you >> please provide the complete kernel log till the point of failure? >> > Suresh, I'm pretty sure this is the same problem that I reported two > weeks ago [1]. I suggested that you tried running lguest and reproduced > the problem locally, but I did not hear back from you. Now Patrick is > reporting the same problem and is also indicating that the problem is > correlated with his use of lguest, so I'd really like you to follow up > on this. > >> I have a theory for your problem and have appended a patch to test it. Can >> you please check if the appended patch fixes your problem. >> > At least for me, with this patch applied on top of -rc4 or -rc6+ the > problem still triggered after running an lguest guest for less than 30 > seconds (the guest didn't even finish the boot of an image of Ubuntu > with no X-server).
The patch also didn't fix the problem here, I got the same crash this morning. Unfortunately netconsole didn't log it, but its essentially the same as the one I posted.
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