[ 818.5264961] panic: kernel diagnostic assertion "to_ticks >= 0" failed: file "/syzkaller/managers/netbsd/kernel/sys/kern/kern_timeout.c", line 335 
[ 818.5264961] cpu0: Begin traceback...
[ 818.5264961] vpanic() at netbsd:vpanic+0x214
[ 818.5264961] _GLOBAL__sub_D_65535_0_cpu_configure() at netbsd:_GLOBAL__sub_D_65535_0_cpu_configure
[ 818.5264961] callout_schedule_locked() at netbsd:callout_schedule_locked+0x25b
[ 818.5264961] sleepq_block() at netbsd:sleepq_block+0x2e9
[ 818.5264961] cv_timedwait_sig() at netbsd:cv_timedwait_sig+0x16f
[ 818.5264961] sbwait() at netbsd:sbwait+0xa2
[ 818.5264961] soreceive() at netbsd:soreceive+0x14ec
[ 818.5264961] do_sys_recvmsg_so() at netbsd:do_sys_recvmsg_so+0x39b
[ 818.5264961] do_sys_recvmsg() at netbsd:do_sys_recvmsg+0xb5
[ 818.5264961] sys_recvfrom() at netbsd:sys_recvfrom+0x179
[ 818.5264961] sys___syscall() at netbsd:sys___syscall+0xe2
[ 818.5264961] syscall() at netbsd:syscall+0x32e
[ 818.5264961] --- syscall (number 198) ---
[ 818.5264961] 705be3e3f4aa:
[ 818.5264961] cpu0: End traceback...

[ 818.5264961] dumping to dev 4,1 (offset=0, size=0): not possible
[ 818.5264961] 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