[ 2123.2102941] panic: kernel diagnostic assertion "to_ticks >= 0" failed: file "/syzkaller/managers/netbsd/kernel/sys/kern/kern_timeout.c", line 335 
[ 2123.2203112] cpu1: Begin traceback...
[ 2123.2303312] vpanic() at netbsd:vpanic+0x214
[ 2123.2403518] _GLOBAL__sub_D_65535_0_cpu_configure() at netbsd:_GLOBAL__sub_D_65535_0_cpu_configure
[ 2123.2603888] callout_schedule_locked() at netbsd:callout_schedule_locked+0x25b
[ 2123.2704169] sleepq_block() at netbsd:sleepq_block+0x2e9
[ 2123.2904456] cv_timedwait_sig() at netbsd:cv_timedwait_sig+0x16f
[ 2123.3004650] sbwait() at netbsd:sbwait+0xa2
[ 2123.3104837] soreceive() at netbsd:soreceive+0x14ec
[ 2123.3205042] do_filereadv() at netbsd:do_filereadv+0x42e
[ 2123.3305231] sys___syscall() at netbsd:sys___syscall+0xe2
[ 2123.3405399] syscall() at netbsd:syscall+0x32e
[ 2123.3505942] --- syscall (number 198) ---
[ 2123.3505942] 7ad86f23f4aa:
[ 2123.3605887] cpu1: End traceback...

[ 2123.3605887] dumping to dev 4,1 (offset=0, size=0): not possible
[ 2123.3705992] 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