Messages in this thread | | | Date | Wed, 13 Jul 2016 10:21:27 +0300 (EEST) | From | Meelis Roos <> | Subject | Re: 4.7-rc6: NMI in intel_idle on HP Proliant G6 |
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> > > > On HP Proliant DL360 G6, Debian unstable 4.6 kernel runs fine but > > > > selfcompiled 4.7-rc6 and 4.7-rc7 sometimes crash with NMI from > > > > intel_idle. Sometimes it boots fine. With intel_idle disabled, it has > > > > booted successful so far in 2 tries, one with rc6 and one with rc7. > > > > > > More testing shows it can NMI on acpi_idle too, not just intel_idle. > > > > > > > Screenshot with some backtrace: > > > > http://kodu.ut.ee/~mroos/intel-idle-NMI.png > > > > > > http://kodu.ut.ee/~mroos/acpi-idle-NMI.png > > > > There were almost no changes in the ACPI idle driver between 4.6 and > > 4.7-rc, so the reason is somewhere else. > > > > Have you tried any earlier 4.7-rc? > > I tried selfcompiled 4.6.0 now with the same conf that 4.7-rc's have and > after multiple tries I got the same NMI out of 4.6 too, from kernfs > lookup (that seems to just a random victim). > > So this is not a 4.7 regression and probably not idle-releated.
Confirmed this is about IOMMU+DMAR, I'm continuing in another reply thread with other CC-s to not bother linux-pm people with it.
-- Meelis Roos (mroos@linux.ee)
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