login: [  27.8614774] panic: kernel diagnostic assertion "c->c_magic == CALLOUT_MAGIC" failed: file "/syzkaller/managers/netbsd/kernel/sys/kern/kern_timeout.c", line 474 
[  27.8614774] cpu1: Begin traceback...
[  27.8726055] vpanic() at netbsd:vpanic+0x214
[  27.8726055] _GLOBAL__sub_D_65535_0_cpu_configure() at netbsd:_GLOBAL__sub_D_65535_0_cpu_configure
[  27.8837321] callout_halt() at netbsd:callout_halt+0x327
[  27.8948606] timer_settime() at netbsd:timer_settime+0x41c
[  27.9059919] dosetitimer() at netbsd:dosetitimer+0x3eb
[  27.9171188] sys___setitimer50() at netbsd:sys___setitimer50+0x127
[  27.9282482] sys___syscall() at netbsd:sys___syscall+0xe2
[  27.9505052] syscall() at netbsd:syscall+0x30e
[  27.9505052] --- syscall (number 198) ---
[  27.9616329] 769cb1e3f4aa:
[  27.9616329] cpu1: End traceback...

[  27.9616329] dumping to dev 4,1 (offset=0, size=0): not possible
[  27.9727606] rebooting...
SeaBIOS (version 1.8.2-20181029_212248-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 0x000f2a00: 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