Date: Sat, 20 Oct 2018 01:39:19 -0700 From: Mark Millard <marklmi@yahoo.com> To: Konstantin Belousov <kib@freebsd.org>, FreeBSD Current <freebsd-current@freebsd.org>, freebsd-stable@freebsd.org Subject: head -r338804 boots threadripper 1950X fine; head -r338810+ do not; -r338807 seems implicated Message-ID: <79973E2B-F5C4-4E7C-B92B-1C8D4441C7D1@yahoo.com>
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I attempted to jump from head -r334014 to -r339076 on a threadripper 1950X board and the boot fails. This is both native booting and under Hyper-V, same machine and root file system in both cases. It fails just after the FreeBSD/SMP lines, reporting "kernel trap 9 with interrupts disabled". It fails in pmap_force_invaldiate_cache_range at a clflusl (%rax) instruction that produces a "Fatal trap 9: general protection fault while in kernel mode". cpudid=0 apic id= 00 I used kernel.txz files from: https://artifact.ci.freebsd.org/snapshot/head/r*/amd64/amd64/ to narrow the range of kernel builds for working -> failing and got: -r338804 boots fine (no amd64 kernel builds between to try) -r338810+ fails (any that I tried, anyway) In that range is -r338807 : QUOTE Author: kib Date: Wed Sep 19 19:35:02 2018 New Revision: 338807 URL: https://svnweb.freebsd.org/changeset/base/338807 Log: Convert x86 cache invalidation functions to ifuncs. This simplifies the runtime logic and reduces the number of runtime-constant branches. Reviewed by: alc, markj Sponsored by: The FreeBSD Foundation Approved by: re (gjb) Differential revision: https://reviews.freebsd.org/D16736 Modified: head/sys/amd64/amd64/pmap.c head/sys/amd64/include/pmap.h head/sys/dev/drm2/drm_os_freebsd.c head/sys/dev/drm2/i915/intel_ringbuffer.c head/sys/i386/i386/pmap.c head/sys/i386/i386/vm_machdep.c head/sys/i386/include/pmap.h head/sys/x86/iommu/intel_utils.c END QUOTE There do seem to be changes associated with clflush(...) use. Looking at: https://svnweb.freebsd.org/base/head/sys/amd64/amd64/pmap.c?annotate=339432 it appears that pmap_force_invalidate_cache_range has not changed since -r338807. It seems that -r338806 and -r3388810 would be unlikely contributors. === Mark Millard marklmi at yahoo.com ( dsl-only.net went away in early 2018-Mar)
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