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Re: port-amd64/52596 (Another netbsd-8 panic)

The following reply was made to PR port-amd64/52596; it has been noted by GNATS.

From: Dominik Bialy <>
Cc: Dominik Bialy <>,
Subject: Re: port-amd64/52596 (Another netbsd-8 panic)
Date: Mon, 9 Oct 2017 14:37:47 +0200

 On Mon, Oct 09, 2017 at 10:13:34AM +0000, wrote:
 > On Mon, Oct 09, 2017 at 10:01:47AM +0200, Dominik Bialy wrote:
 > > Current sysctls are:
 > > 
 > > yenn# sysctl machdep.xsave_features
 > > machdep.xsave_features = 0
 > > yenn# sysctl machdep.fpu_save
 > > machdep.fpu_save = 1
 > > 
 > > I'll try applying the patch today and building the kernel.
 > sorry, I misread the code, it shouldn't make a functional difference
 > either way.
 > do you have a coredump in /var/crash?
 > can you:
 > gunzip netbsd.3.core.gz
 > gunzip netbsd.3.gz
 > crash -M netbsd.3.core -N netbsd.3
 > crash> dmesg
 > (only to confirm it died at the same spot)
 > crash> examine x86_xsave_features
 > crash> bt
 I found one coredump from Sep 23 (sources were
 dated around Sep 15.)
 fatal privileged instruction fault in supervisor mode
 trap type 0 code 0 rip 0xffffffff80224a52 cs 0x8 rflags 0x10016 cr2 0x75ba90c36d60 ilevel 0x8 rsp 0xfffffe804057
 curlwp 0xfffffe81318c2720 pid 391.2 lowest kstack 0xfffffe80405792c0
 panic: trap
 cpu1: Begin traceback...
 vpanic() at netbsd:vpanic+0x140
 snprintf() at netbsd:snprintf
 startlwp() at netbsd:startlwp
 alltraps() at netbsd:alltraps+0x96
 fpudna() at netbsd:fpudna+0x61
 cpu1: End traceback...
 dumping to dev 18,1 (offset=132519, size=1032011):
 crash> examine x86_xsave_features
 x86_xsave_features:     160b78a0
 crash> bt
 vpanic() at vpanic+0x149
 snprintf() at snprintf
 startlwp() at startlwp
 calltrap() at calltrap+0x11
 fpudna() at fpudna+0x61

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