netbsd boot error: panic: taKgeB 2:lunt0x <Grogl: P_ssistch,Di8:, 1indiock hxed

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit: 85bd237a dm: Simplify list eviction code
git tree: netbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=14de477ae00000
kernel config: https://syzkaller.appspot.com/x/.config?x=824b23e1f4b6c76b
dashboard link: https://syzkaller.appspot.com/bug?extid=dc028f1e70b0b80ee0ec
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+dc028f...@syzkaller.appspotmail.com

[ 1.4718635] sd0 at scsibus0panic: taKgeB 2:lunt0x <Grogl:
P_ssistch,Di8:, 1indiock hxed
[
1.5145[5 cpu1: B3g n t: cebric..i[
1.5145353] ng a geometry
[ 1.5145353] sd0: 8192 MB, 8192 cyl, 64 head, 32 sec, 512 bytes/sect x
16777216 sectors
[ 1.5284718] sd0: fabricating a geometry
[ 1.53178[ ] 1p5ni78) atsd0: async, 8-bit transfers, tagged queueing
[ 1.5415992] netbsd:vpanic+0x2aa
[ 1.5516243] snprintf() at netbsd:snprintf
[ 1.5816653] lockdebug_abort1() at netbsd:lockdebug_abort1+0x16e
sys/kern/subr_lockdebug.c:799
[ 1.6016932] lockdebug_barrier() at netbsd:lockdebug_barrier+0x157
sys/kern/subr_lockdebug.c:673
[ 1.6117055] mi_switch() at netbsd:mi_switch+0xbf
sys/kern/kern_synch.c:532
[ 1.6117055] idle_loop() at netbsd:idle_loop+0x4bf x86_curlwp
sys/arch/amd64/compile/obj/GENERIC_SYZKALLER/./machine/cpu.h:79 [inline]
[ 1.6117055] idle_loop() at netbsd:idle_loop+0x4bf sys/kern/kern_idle.c:99
[ 1.6117055] cpu_hatch() at netbsd:cpu_hatch+0x3a7
sys/arch/x86/x86/cpu.c:970
[ 1.6117055] cpu1: End traceback...
[ 1.6117055] fatal breakpoint trap in supervisor mode
[ 1.6117055] trap type 1 code 0 rip 0xffffffff8021ddbd cs 0x8 rflags
0x282 cr2 0 ilevel 0x8 rsp 0xffffd000a57c6d30
[ 1.6117055] curlwp 0xffff84aae7c58100 pid 0.20 lowest kstack
0xffffd000a57c32c0
Stopped in pid 0.20 (system) at netbsd:breakpoint+0x5: leave
db{1}>


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[Maxime Villard]

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