login: [  60.9898598] panic: kernel diagnostic assertion "mutex_owned(pipe->pipe_lock)" failed: file "/syzkaller/managers/netbsd/kernel/sys/kern/sys_pipe.c", line 371 
[  60.9898598] cpu0: Begin traceback...
[  60.9898598] vpanic() at netbsd:vpanic+0x214
[  61.0011960] _GLOBAL__sub_D_65535_0_cpu_configure() at netbsd:_GLOBAL__sub_D_65535_0_cpu_configure
[  61.0125323] pipelock() at netbsd:pipelock+0xb0
[  61.0238685] pipe_write() at netbsd:pipe_write+0x99
[  61.0359948] dofilewrite() at netbsd:dofilewrite+0x1b7
[  61.0474204] sys_write() at netbsd:sys_write+0x78
[  61.0585615] sys___syscall() at netbsd:sys___syscall+0xe2
[  61.0703864] syscall() at netbsd:syscall+0x32e
[  61.0805530] --- syscall (number 198) ---
[  61.0805530] 75563f43f4aa:
[  61.0932678] cpu0: End traceback...

[  61.0932678] dumping to dev 4,1 (offset=0, size=0): not possible
[  61.0932678] 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