Messages in this thread | | | Date | Fri, 5 Dec 2014 14:04:07 -0500 | From | Chris Mason <> | Subject | Re: frequent lockups in 3.18rc4 |
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On Fri, Dec 5, 2014 at 1:38 PM, Linus Torvalds <torvalds@linux-foundation.org> wrote: > On Fri, Dec 5, 2014 at 9:15 AM, Dave Jones <davej@redhat.com> wrote: >> >> A bisect later, and I landed on a kernel that ran for a day, before >> spewing NMI messages, recovering, and then.. >> >> >> https://urldefense.proofpoint.com/v1/url?u=http://codemonkey.org.uk/junk/log.txt&k=ZVNjlDMF0FElm4dQtryO4A%3D%3D%0A&r=6%2FL0lzzDhu0Y1hL9xm%2BQyA%3D%3D%0A&m=APfD8%2BRkGVsO9UHnH6Oo05Zuoh90VyaaF71AycsnLbQ%3D%0A&s=de71b34f3a7da1c7b8f12dcd760c271657f9f7e2a93b4d2e296b2c687cee5157 > > I have to admit I'm seeing absolutely nothing sensible in there. > > Call it bad, and see if bisection ends up slowly -oh so slowly - > pointing to some direction. Because I don't think it's the hardware, > considering that apparently 3.16 is solid. And the spews themselves > are so incomprehensible that I'm not seeing any pattern what-so-ever.
I went back through all of the traces Dave has posted in this thread. This one looks like vm debugging is on:
http://marc.info/?l=linux-kernel&m=141632237304726&w=2
Another had a function call from CONFIG_DEBUG_PAGEALLOC:
http://marc.info/?l=linux-kernel&m=141701248210949&w=2
So one idea is that our allocation/freeing of pages is dramatically more expensive and we're hitting a strange edge condition. Maybe we're even faulting on a readonly page from a horrible place?
[83246.925234] end_request: I/O error, dev sda, sector 0
Ext3/4 shouldn't be doing IO to sector zero. Something is stomping on ram?
-chris
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