[ 238.9659836] panic: kernel diagnostic assertion "mutex_owned(pipe->pipe_lock)" failed: file "/syzkaller/managers/netbsd/kernel/sys/kern/sys_pipe.c", line 371 
[
 [2 3283.89.990930330300]0 ] WcARpNuI0N:G :B eSgPiLn  NtOraT ceLObWaEckRE.D. .O
[
 238.9903300] N SYSCALL 0v p-a1n82i1c3()5 57a8t4  EXIT 93705n0e0tb0 s7d
[ 
23[8 .239890.93930003]30 :0]vp WaAnRiNcI+0NxG:21 S4
P
[ 238.9903300] L NOT LOWERED ON TRAP EXIT 6 0
[ 238.[9 9230833.09090] 33W0AR0N] IN_GG:L OSBAPLL_ _NsOTub _LODW_E6R55E3D 5_O0N_ cTRpuA_P cEoXnfIiT gu6 re0
(
[ [2 32388.9.9990033303000]]  ) WAatR NING: SPL NOnT eLtObsWEd:RE_DGL OOBNA TL_R_AsP uEbX_DI_T6 565 305
[
 [2 23388..99990033330000] ] _W0A_RcNpIu_NGc:on SfPiLg uNrOe
T[ 238.9903300]  LOWERED ON SYSCALL 0 -1812055816 EXIT 93fe3800 7
[ 238.9903300] pipelock() at netbsd:pipelock+0xb0
[ 238.9903300] pipe_write() at netbsd:pipe_write+0x99
[ 238.9903300] do_filewritev() at netbsd:do_filewritev+0x438
[ 238[. 92930383.0909]03 s3y00s]__ W_AsRysNcINaGll: (S)P Lat  NOT LOWERED nOeNtb TsRdA:Ps yEsX__IT_s y6s 0c
a
[ [ 22383.89.999030333000]0 ]l lWA+0RNxeI2N[
 
238.9903300] G: SPL NOT LOWERED ON TRAP EXIT 6 0
[ 238.99033[0 02]3 W8.AR9N90IN3G3:0 0]SP Ls ysNcOaTl lL(O)WE atR ED ON TRAP EXIT 6n 0et
[[  23283.89.9990033330000]] b WsAdR:NsIysNGc:a llSP+0Lx N3O2eT[
 
[2 382.3989.0939030330]0 0 ]L O--WE-R EsyD scOaN llSY S(CnAumLLb er0  -119680)2 5-0-4-
0[
 238.9903300]  EXIT 0 77c
2
[ 238.9903300] 5b583f4aa:
[ 238.9903300] cpu0: End traceback...

[ 238.9903300] dumping to dev 4,1 (offset=0, size=0): not possible
[ 238.9903300] 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