[ 3804.6385101] panic: kernel diagnostic assertion "(c->c_flags & CALLOUT_PENDING) == 0" failed: file "/syzkaller/managers/netbsd/kernel/sys/kern/kern_timeout.c", line 317 callout 0xffffc70012efb770: c_func (0xffffffff80facf72) c_flags (0x102) destroyed from 0xffffffff80face3f
[ 3804.6718974] cpu1: Begin traceback...
[ 3804.6830277] vpanic() at netbsd:vpanic+0x214
[ 3804.6941588] _GLOBAL__sub_D_65535_0_cpu_configure() at netbsd:_GLOBAL__sub_D_65535_0_cpu_configure
[ 3804.7052899] callout_destroy() at netbsd:callout_destroy+0x118
[ 3804.7275460] itimerfree() at netbsd:itimerfree+0x102
[ 3804.7386740] timers_free() at netbsd:timers_free+0x2ef
[ 3804.7498040] exit1() at netbsd:exit1+0x28f
[ 3804.7609352] sys_exit() at netbsd:sys_exit+0x6c
[ 3804.7720655] syscall() at netbsd:syscall+0x32e
[ 3804.7720655] --- syscall (number 1) ---
[ 3804.7831930] 75b86f2fe47a:
[ 3804.7831930] cpu1: End traceback...

[ 3804.7943209] dumping to dev 4,1 (offset=0, size=0): not possible
[ 3804.7943209] 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