On 21 November 2017 at 11:09, Richard Purdie < richard.pur...@linuxfoundation.org> wrote:
> > > o Issues with 4.13.10 host kernels booting kvm x86 guests on > > > Tumbleweed (Suse) and Fedora 26 (attempting to see if 4.13.12 > > > helps) > > > > Robert, can you test Fedora 26. It would help to have a defect open > > with steps to reproduce or > > something about the typical workflow/ build time/ day of the week/ > > phase of the moon. > > FWIW we have noticed that the choice of kernel timers seems to vary in > the x86_64 boots but not with a pattern that matches the hangs. Also of note is that last week the cluster was hitting this once in every nightly run, but after a complete reboot and kernel upgrade we haven't seen it so far. So either it's gone with the latest kernels, or it's a slow accumulation of non-movable memory that eventually breaks kvm (my money is on the latter). > > > o a perf build race (bug 12302) > > I'll take a look to: > > - see if I can duplicate the bug on a fast build host > > - check upstream to see if the bug is known/fixed > > - see if I can spot a race in the build rules. > > Sounds good, thanks! It looks and sounds like a classic makefile dependency bug, should be reproducible on demand with careful explicit target steps. The perf makefiles are not exactly easy to hack though... Ross
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