On an amd64 system running a 6.1 from November 2013 (yes, I need to update)
I got the following panic (manual OCR from screen photographs):
fatal protection fault in supervisor mode
trap type 4 code 0 rip ffffffff80100504 cs 8 rflags 10246 cr2 7f7ffffffe50
cpl8 rsp fffffe8055879670
kernel: protection fault trap, code=0
Stopped in pid 26911.26911 (mount) at netbsd:cpu_switchto+0xf4: wrmsr
db{4} bt
cpu_switchto() at netbsd:cpu_switchto+0xf4
kpreempt() at netbsd:kpreempt+0xe2
Xpreemtresume() at netbsd:Xpreemptresume+0x28
cpu_fsgs_zero() at netbsd:cpu_fsgs_zero+0x6a
setregs() at netbsd:setregs+0x7f
execve_runprog() at netbsd: execve_runprog+0x708
execve1() at netbsd: execve1+0x33
linux32_syscall() at netbsd:linux32_syscall+0xb9
db{4}> show registers
ds 1b0
es c878
fs 1b0
gs 1
rdi fffffe841978aa50
rsi fffffe806cb3d780
rbp fffffe80558796f0
rbx fffffe811d84c2c0
rdx fbcff3dd
rcx c0000102
rax fb50ffff
r8 0
r9 0
r10 0
r11 1
r12 fffffe806cb3d780
r13 fffffe811d84c2c0
r14 fffffe8055879d80
r15 0
rip ffffffff80100504 cpu_switchto+0xf4
cs 8
rflags 10246
rsp fffffe8055879670
ss 0
netbsd:cpu_switchto+0xf8 wrmsr
db{4}> reboot
After that, the machine was completely stuck, i.e., Ctrl-Alt-Esc didn't work.
I had to press reset.
