Messages in this thread | | | Subject | Re: [BISECTED]: Kernel panic (was: Linux 5.7-rc2) | From | Giovanni Gherdovich <> | Date | Wed, 22 Apr 2020 16:49:10 +0200 |
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On Wed, 2020-04-22 at 09:12 -0500, Dave Kleikamp wrote: > On 4/22/20 4:02 AM, Giovanni Gherdovich wrote: > > Linus, Peter: > > > > the panic seen by Harald Arnesen (and Dave Kleikamp) is unrelated to > > virtualization, and happens on all machines that have a CPU with less than 4 > > physical cores. It's a very serious (and very stupid) bug in the original > > version of my code and is fixed by patch 2/4 "x86, sched: Account for CPUs > > with less than 4 cores in freq. invariance" in the series > > > > https://lore.kernel.org/lkml/20200416054745.740-1-ggherdovich@suse.cz > > > > Harald, Dave: > > > > for peace of mind, can you please share the output of > > > > turbostat --interval 1 sleep 0 > > This is a Lenovo T410. > > turbostat version 20.03.20 - Len Brown <lenb@kernel.org> > CPUID(0): GenuineIntel 0xb CPUID levels; 0x80000008 xlevels; family:model:stepping 0x6:25:5 (6:37:5) > [...] > cpu0: MSR_TURBO_RATIO_LIMIT: 0x00001416 > 20 * 133.3 = 2666.6 MHz max turbo 2 active cores > 22 * 133.3 = 2933.3 MHz max turbo 1 active cores
2 cores/ 4 threads, reported 4C turbo frequency of zero (i.e. bits 31:24 in MSR_TURBO_RATIO_LIMIT). This is consistent with all other occurrences of this bug that have been reported.
Thanks Dave for your reply.
Giovanni
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