[ 461.3302971] panic: kernel diagnostic assertion "vp->v_type == VREG" failed: file "/syzkaller/managers/netbsd/kernel/sys/ufs/ufs/ufs_readwrite.c", line 292 
[ 461.3503600] cpu1: Begin traceback...
[ 461.3603998] vpanic() at netbsd:vpanic+0x214
[ 461.3704380] _GLOBAL__sub_D_65535_0_cpu_configure() at netbsd:_GLOBAL__sub_D_65535_0_cpu_configure
[ 461.3804725] ffs_write() at netbsd:ffs_write+0x6ba
[ 461.3905090] VOP_WRITE() at netbsd:VOP_WRITE+0x12c
[ 461.4005458] vn_write() at netbsd:vn_write+0x167
[ 461.4105828] dofilewrite() at netbsd:dofilewrite+0x1b7
[ 461.4206198] sys_write() at netbsd:sys_write+0x78
[ 461.4306568] sys___syscall() at netbsd:sys___syscall+0xe2
[ 461.4507326] syscall() at netbsd:syscall+0x32e
[ 461.4507326] --- syscall (number 198) ---
[ 461.4607704] 7af7eca3f4aa:
[ 461.4607704] cpu1: End traceback...

[ 461.4607704] dumping to dev 4,1 (offset=0, size=0): not possible
[ 461.4708197] rebooting...
SeaBIOS (version 1.8.2-20190204_181744-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