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Re: mm, vmscan: commit makes PAE kernel crash nightly (bisected)

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On 2017-01-24 Michal Hocko wrote:
> On Sun 22-01-17 18:45:59, Trevor Cordes wrote:
> [...]
> > Also, completely separate from your patch I ran mhocko's 4.9 tree
> > with mem=2G to see if lower ram amount would help, but it didn't.
> > Even with 2G the system oom and hung same as usual.  So far the
> > only thing that helps at all was the cgroup_disable=memory option,
> > which makes the problem disappear completely for me.  
> 
> OK, can we reduce the problem space slightly more and could you boot
> with kmem accounting enabled? cgroup.memory=nokmem,nosocket

I ran for 30 hours with cgroup.memory=nokmem,nosocket using vanilla
4.9.0+ and it oom'd during a big rdiff-backup at 9am.  My script was
able to reboot it before it hung.  Only one oom occurred before the
reboot, which is a bit odd, usually there is 5-50.  See attached
messages log (oom6).

So, still, only cgroup_disable=memory mitigates this bug (so far).  If
you need me to test cgroup.memory=nokmem,nosocket with your since-4.9
branch specifically, let me know and I'll add it to the to-test list.

On 2017-01-25 Michal Hocko wrote:
> On Wed 25-01-17 04:02:46, Trevor Cordes wrote:
> > OK, I patched & compiled mhocko's git tree from the other day
> > 4.9.0+. (To confirm, weird, but mhocko's git tree I'm using from a
> > couple of weeks ago shows the newest commit (git log) is
> > 69973b830859bc6529a7a0468ba0d80ee5117826 "Linux 4.9"?  Let me know
> > if I'm doing something wrong, see below.)  
> 
> My fault. I should have noted that you should use since-4.9 branch.

OK, I got it now, I'm retesting the runs I did (with/without the
various patches) on your git tree and will re-report the (correct)
results.  Will take a few days.  Thanks!

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Re: mm, vmscan: commit makes PAE kernel crash nightly (bisected) Michal Hocko <mhocko@kernel.org> - 2017-01-17 15:00 +0100
  Re: mm, vmscan: commit makes PAE kernel crash nightly (bisected) Mel Gorman <mgorman@techsingularity.net> - 2017-01-17 15:30 +0100
    Re: mm, vmscan: commit makes PAE kernel crash nightly (bisected) Michal Hocko <mhocko@kernel.org> - 2017-01-17 16:00 +0100
      Re: mm, vmscan: commit makes PAE kernel crash nightly (bisected) Trevor Cordes <trevor@tecnopolis.ca> - 2017-01-18 08:30 +0100
      Re: mm, vmscan: commit makes PAE kernel crash nightly (bisected) Mel Gorman <mgorman@techsingularity.net> - 2017-01-18 18:50 +0100
      Re: mm, vmscan: commit makes PAE kernel crash nightly (bisected) Mel Gorman <mgorman@techsingularity.net> - 2017-01-18 19:10 +0100
      Re: mm, vmscan: commit makes PAE kernel crash nightly (bisected) Trevor Cordes <trevor@tecnopolis.ca> - 2017-01-19 10:50 +0100
        Re: mm, vmscan: commit makes PAE kernel crash nightly (bisected) Michal Hocko <mhocko@kernel.org> - 2017-01-19 12:40 +0100
          Re: mm, vmscan: commit makes PAE kernel crash nightly (bisected) Trevor Cordes <trevor@tecnopolis.ca> - 2017-01-20 07:40 +0100
            Re: mm, vmscan: commit makes PAE kernel crash nightly (bisected) Mel Gorman <mgorman@techsingularity.net> - 2017-01-20 12:10 +0100
              Re: mm, vmscan: commit makes PAE kernel crash nightly (bisected) Mel Gorman <mgorman@techsingularity.net> - 2017-01-20 17:00 +0100
                Re: mm, vmscan: commit makes PAE kernel crash nightly (bisected) Mel Gorman <mgorman@techsingularity.net> - 2017-01-23 11:50 +0100
                Re: mm, vmscan: commit makes PAE kernel crash nightly (bisected) Mel Gorman <mgorman@techsingularity.net> - 2017-01-23 12:10 +0100
                Re: mm, vmscan: commit makes PAE kernel crash nightly (bisected) Michal Hocko <mhocko@kernel.org> - 2017-01-25 10:50 +0100
                Re: mm, vmscan: commit makes PAE kernel crash nightly (bisected) Michal Hocko <mhocko@kernel.org> - 2017-01-24 14:00 +0100
                Re: mm, vmscan: commit makes PAE kernel crash nightly (bisected) Trevor Cordes <trevor@tecnopolis.ca> - 2017-01-25 11:30 +0100
                Re: mm, vmscan: commit makes PAE kernel crash nightly (bisected) Michal Hocko <mhocko@kernel.org> - 2017-01-25 13:10 +0100
                Re: mm, vmscan: commit makes PAE kernel crash nightly (bisected) Trevor Cordes <trevor@tecnopolis.ca> - 2017-01-30 00:00 +0100
                Re: mm, vmscan: commit makes PAE kernel crash nightly (bisected) Michal Hocko <mhocko@kernel.org> - 2017-01-30 09:00 +0100
                Re: mm, vmscan: commit makes PAE kernel crash nightly (bisected) Mel Gorman <mgorman@techsingularity.net> - 2017-01-30 10:20 +0100
                Re: mm, vmscan: commit makes PAE kernel crash nightly (bisected) Michal Hocko <mhocko@kernel.org> - 2017-01-24 14:00 +0100
                Re: mm, vmscan: commit makes PAE kernel crash nightly (bisected) Trevor Cordes <trevor@tecnopolis.ca> - 2017-01-27 00:20 +0100
                Re: mm, vmscan: commit makes PAE kernel crash nightly (bisected) Michal Hocko <mhocko@kernel.org> - 2017-01-27 08:40 +0100
            Re: mm, vmscan: commit makes PAE kernel crash nightly (bisected) Michal Hocko <mhocko@kernel.org> - 2017-01-24 14:00 +0100

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