[ 617.4207062] panic: kernel diagnostic assertion "usec >= 0 && usec < 1000000" failed: file "/syzkaller/managers/netbsd/kernel/sys/kern/subr_time.c", line 101 
[ 617.4207062] cpu1: Begin traceback...
[ 617.4318399] vpanic() at netbsd:vpanic+0x214
[ 617.4318399] _GLOBAL__sub_D_65535_0_cpu_configure() at netbsd:_GLOBAL__sub_D_65535_0_cpu_configure
[ 617.4540953] tvtohz() at netbsd:tvtohz+0x167
[ 617.4652238] tstohz() at netbsd:tstohz+0xa7
[ 617.4763495] nanosleep1() at netbsd:nanosleep1+0x1f4
[ 617.4874797] sys_clock_nanosleep() at netbsd:sys_clock_nanosleep+0x10d
[ 617.4986103] sys___syscall() at netbsd:sys___syscall+0xe2
[ 617.5097366] syscall() at netbsd:syscall+0x32e
[ 617.5208674] --- syscall (number 198) ---
[ 617.5208674] 7c796103f4aa:
[ 617.5319966] cpu1: End traceback...

[ 617.5319966] dumping to dev 4,1 (offset=0, size=0): not possible
[ 617.5431223] rebooting...
SeaBIOS (version 1.8.2-20190122_225043-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