> > > > 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 ([email protected])
