[ 2205.9027174] panic: kernel diagnostic assertion "(c->c_flags & CALLOUT_PENDING) == 0" failed: file "/syzkaller/managers/netbsd/kernel/sys/kern/kern_timeout.c", line 317 callout 0xffffbd8012e4bdd0: c_func (0xffffffff80fceecb) c_flags (0x102) destroyed from 0xffffffff80fcecbb
[ 2205.9261323] cpu1: Begin traceback...
[ 2205.9339399] vpanic() at netbsd:vpanic+0x214
[ 2205.9456453] _GLOBAL__sub_D_65535_0_cpu_configure() at netbsd:_GLOBAL__sub_D_65535_0_cpu_configure
[ 2205.9573552] callout_destroy() at netbsd:callout_destroy+0x118
[ 2205.9690621] itimerfree() at netbsd:itimerfree+0x16a
[ 2205.9807695] timers_free() at netbsd:timers_free+0x308
[ 2205.9885724] exit1() at netbsd:exit1+0x25b
[ 2205.9963785] sys_exit() at netbsd:sys_exit+0x6c
[ 2206.0080854] syscall() at netbsd:syscall+0x32e
[ 2206.0158900] --- syscall (number 1) ---
[ 2206.0197913] 7a486d6fe47a:
[ 2206.0236944] cpu1: End traceback...

[ 2206.0275976] dumping to dev 4,1 (offset=0, size=0): not possible
[ 2206.0315010] rebooting...
SeaBIOS (version 1.8.2-20190322_093631-google)
Total RAM Size = 0x00000001e0000000 = 7680 MiB
CPUs found: 2     Max CPUs supported: 2
found virtio-scsi at 0:3
virtio-scsi vendor='Google' product='PersistentDisk' rev='1' type=0 removable=0
virtio-scsi blksize=512 sectors=4194304 = 2048 MiB
drive 0x000f29c0: PCHS=0/0/0 translation=lba LCHS=520/128/63 s=4194304
Booting from Hard Disk 0...

>> NetBSD/x86 BIOS Boot, Revision 5.10 (Tue Jul 17 14:59:51 UTC 2018) (from NetBSD 8.0)
>> Memory: 639/3144640 k

     1. Boot normally
     2. Boot single user
     3. Disable ACPI
     4. Disable ACPI and SMP
     5. Drop to boot prompt