Panic with 9.99.94

[John Klos <john%ziaspace.com@localhost>]

Hi, all,

While stress testing a new Ryzen 3900X with NetBSD from yesterday's 
sources (running pbulks, mostly), this happened:

[ 52610.574409] fatal protection fault in supervisor mode
[ 52610.574409] trap type 4 code 0 rip 0xffffffff80d4d8c5 cs 0x8 rflags 0x10282 cr2 0x6fa115e0ee00 ilevel 0 rsp 0xffffa805ce812da0
[ 52610.574409] curlwp 0xffffca42d6be5180 pid 7231.7231 lowest kstack 0xffffa805ce80e2c0
[ 52610.574409] panic: trap
[ 52610.574409] cpu23: Begin traceback...
[ 52610.574409] vpanic() at netbsd:vpanic+0x156
[ 52610.574409] panic() at netbsd:panic+0x3c
[ 52610.574409] trap() at netbsd:trap+0xb27
[ 52610.574409] --- trap (number 4) ---
[ 52610.574409] uvm_pagefree() at netbsd:uvm_pagefree+0x38d
[ 52610.574409] uvm_anfree() at netbsd:uvm_anfree+0x88
[ 52610.574409] amap_wipeout() at netbsd:amap_wipeout+0xa2
[ 52610.574409] uvm_unmap_detach() at netbsd:uvm_unmap_detach+0x56
[ 52610.574409] uvmspace_free() at netbsd:uvmspace_free+0xeb
[ 52610.574409] exit1() at netbsd:exit1+0x1b8
[ 52610.574409] sys_exit() at netbsd:sys_exit+0x39
[ 52610.574409] syscall() at netbsd:syscall+0x196
[ 52610.574409] --- syscall (number 1) ---
[ 52610.574409] netbsd:syscall+0x196:
[ 52610.574409] cpu23: End traceback...

[ 52610.574409] dumping to dev 168,2 (offset=188902, size=16753349):
[ 52610.574409] dump

dmesg with panic: https://klos.com/~john/ryzen_dmesg

Any ideas about what happened here?

John