netbsd boot error: panic: OCKgEBU2: Mut0x eroog:em _swststent8i s, 1> dck eix[ 11.ADDR cpu1[ 1.ADDR] : Begin traceback...

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit: 582fab2b Remove trailing whitespace.
git tree: netbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=16c6e77ae00000
kernel config: https://syzkaller.appspot.com/x/.config?x=6e4d6bd2b8e377a2
dashboard link: https://syzkaller.appspot.com/bug?extid=35aeef250ee9d957537d
compiler: g++ (Ubuntu 5.4.0-6ubuntu1~16.04.12) 5.4.0 20160609

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+35aeef...@syzkaller.appspotmail.com

[ 1.7593166] sd0 at scsibus0panic: OCKgEBU2: Mut0x eroog:em _swststent8i
s, 1> dck eix
[ 11.0000455 cpu1[ 1.8090145] : Begin traceback...
[ 1.8228631] sd0: fabricating a geometry
[ 1.8228631] sd0: 8192 MB, 8192 cyl, 64 head, 32 sec, 512 bytes/sect x
16777216 sectors
[ 1.8415570] sd0: fabricating a geometrv[ 1.8415570] panic() at
netbsd:vpanic+0x241 sys/kern/subr_prf.c:336
[ 1.8677208] sd0: async, 8-bit transfers, tagged queueing
[ 1.9088545] snprintf() at netbsd:snprintf
[ 1.9088545] lockdebug_more() at netbsd:lockdebug_more
[ 1.9088545] lockdebug_barrier() at netbsd:lockdebug_barrier+0xfe
sys/kern/subr_lockdebug.c:684
[ 1.9088545] mi_switch() at netbsd:mi_switch+0xfb
sys/kern/kern_synch.c:532
[ 1.9088545] idle_loop() at netbsd:idle_loop+0x34a x86_curlwp
sys/arch/amd64/compile/obj/GENERIC_SYZKALLER/./machine/cpu.h:79 [inline]
[ 1.9088545] idle_loop() at netbsd:idle_loop+0x34a sys/kern/kern_idle.c:99
[ 1.9088545] cpu_hatch() at netbsd:cpu_hatch+0x270
sys/arch/x86/x86/cpu.c:980
[ 1.9088545] Bad frame pointer: 0xffffbb800f738100
[ 1.9088545] cpu1: End traceback...
[ 1.9088545] fatal breakpoint trap in supervisor mode
[ 1.9088545] trap type 1 code 0 rip 0xffffffff8021ccb5 cs 0x8 rflags
0x246 cr2 0 ilevel 0x8 rsp 0xffffbb816db37b50
[ 1.9088545] curlwp 0xffffbb800f738100 pid 0.20 lowest kstack
0xffffbb816db302c0
Stopped in pid 0.20 (system) at netbsd:breakpoint+0x5: leave
db{1}>


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