Messages in this thread |  | | Date | Sun, 6 Jan 2013 19:37:18 -0500 | From | Dave Jones <> | Subject | Re: oops in copy_page_rep() |
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On Sat, Jan 05, 2013 at 07:57:39PM -0800, Linus Torvalds wrote: > Adding more people in case somebody else has any idea. Anybody? > > On Sat, Jan 5, 2013 at 7:22 AM, Dave Jones <davej@redhat.com> wrote: > > I have no idea what happened here, but this is the first time I've seen this one. > > This was running a tree pulled yesterday afternoon. > > > > BUG: unable to handle kernel paging request at ffff880100201000 > > This is %rsi, which is the source for the page copy: > > copy_user_highpage()-> > copy_user_page()-> > copy_page()-> > copy_page_rep > > I don't know exactly which copy_user_highpage() case this is from, the > call trace implies this *could* be a hugepage, and those functions do > copy pages individually in a loop too.
investigating the huge page theory a little further I'm a bit confused. The kernel on that machine has THP enabled, and the cpu supports it (an old amd64), but..
$ cat /sys/kernel/mm/hugepages/hugepages-2048kB/* 0 0 0 0 0 0
I was expecting at least one of those to be non-zero.
/sys/kernel/mm/transparent_hugepage/khugepaged/full_scans and pages_collapsed are both non-zero, so it's been busy doing _something_.
Is this expected behaviour ?
Dave
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