Warning: Permanently added '10.128.0.153' (ECDSA) to the list of known hosts.
executing program
vrele: bad writecount: 0xfffffd806e5c54e8, type VCHR, use 0, write 1, hold 0,
tag VT_UFS, ino 2676, on dev 4, 0 flags 0x180, effnlink 1, nlink 1
mode 020620, owner 0, group 4, size 0
panic: vrele: v_writecount != 0
Stopped at db_enter+0x18: addq $0x8,%rsp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
162917 41558 0 0x2 0 0 syz-executor0898
*361815 41558 0 0x2 0x4000000 1K syz-executor0898
db_enter() at db_enter+0x18
panic(ffffffff82460f22) at panic+0x15e
vrele(fffffd806e5c54e8) at vrele+0x197
ptmioctl(5100,40287401,ffff800021250740,3,ffff8000ffff7cf0) at ptmioctl+0x5b9
VOP_IOCTL(fffffd806e6f8050,40287401,ffff800021250740,3,fffffd807f7b7b40,ffff8000ffff7cf0) at VOP_IOCTL+0x9a
vn_ioctl(fffffd807b79dc78,40287401,ffff800021250740,ffff8000ffff7cf0) at vn_ioctl+0xba
sys_ioctl(ffff8000ffff7cf0,ffff800021250850,ffff8000212508a0) at sys_ioctl+0x4b0
syscall(ffff800021250920) at syscall+0x4a1
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x2a22d1d7fd0, count: 6
https://www.openbsd.org/ddb.html describes the minimum info required in bug
reports. Insufficient info makes it difficult to find and fix bugs.
ddb{1}>
ddb{1}> set $lines = 0
ddb{1}> set $maxwidth = 0
ddb{1}> show panic
vrele: v_writecount != 0
ddb{1}> trace
db_enter() at db_enter+0x18
panic(ffffffff82460f22) at panic+0x15e
vrele(fffffd806e5c54e8) at vrele+0x197
ptmioctl(5100,40287401,ffff800021250740,3,ffff8000ffff7cf0) at ptmioctl+0x5b9
VOP_IOCTL(fffffd806e6f8050,40287401,ffff800021250740,3,fffffd807f7b7b40,ffff8000ffff7cf0) at VOP_IOCTL+0x9a
vn_ioctl(fffffd807b79dc78,40287401,ffff800021250740,ffff8000ffff7cf0) at vn_ioctl+0xba
sys_ioctl(ffff8000ffff7cf0,ffff800021250850,ffff8000212508a0) at sys_ioctl+0x4b0
syscall(ffff800021250920) at syscall+0x4a1
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x2a22d1d7fd0, count: -9
ddb{1}> show registers
rdi 0
rsi 0x1
rbp 0xffff800021250180
rbx 0xffff800021250190
rdx 0x8b
rcx 0x2
rax 0x1
r8 0xffffffff81ea78f5 kprintf+0x145
r9 0x1
r10 0x24c6537b6a726167
r11 0x4f7add1104960cee
r12 0x3000000008
r13 0xffff800021250230
r14 0x100
r15 0x1
rip 0xffffffff8184d248 db_enter+0x18
cs 0x8
rflags 0x246
rsp 0xffff800021250170
ss 0x10
db_enter+0x18: addq $0x8,%rsp
ddb{1}> show proc
PROC (syz-executor0898) pid=361815 stat=onproc
flags process=2<EXEC,8ORPHAN> proc=4000000<THREAD>
pri=50, usrpri=50, nice=20
forw=0xffffffffffffffff, list=0xffff8000ffff67f0,0xffffffff828cbbd0
process=0xffff8000ffff9520 user=0xffff80002124b000, vmspace=0xfffffd806ea45458
estcpu=0, cpticks=2, pctcpu=0.0
user=0, sys=2, intr=0
ddb{1}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
41558 162917 26770 0 7 0x2 syz-executor0898
41558 176978 26770 0 3 0x4000082 fsleep syz-executor0898
*41558 361815 26770 0 7 0x4000002 syz-executor0898
26770 206913 69901 0 3 0x10008a sigsusp ksh
69901 65485 27615 0 3 0x92 select sshd
66141 47352 1 0 3 0x100083 ttyin getty
27615 395321 1 0 3 0x80 select sshd
71210 257144 87974 73 3 0x100090 kqread syslogd
87974 206453 1 0 3 0x100082 netio syslogd
34860 478508 1 77 3 0x100090 poll dhclient
88871 444608 1 0 3 0x80 poll dhclient
10406 488320 0 0 3 0x14200 bored smr
96161 496832 0 0 2 0x14200 zerothread
49572 240212 0 0 3 0x14200 aiodoned aiodoned
86001 471820 0 0 3 0x14200 syncer update
63143 34852 0 0 3 0x14200 cleaner cleaner
32942 119743 0 0 3 0x14200 reaper reaper
47710 263905 0 0 3 0x14200 pgdaemon pagedaemon
85920 24403 0 0 3 0x14200 bored crynlk
26557 33589 0 0 3 0x14200 bored crypto
10689 162877 0 0 3 0x14200 bored viomb
71004 328316 0 0 3 0x40014200 acpi0 acpi0
22594 481885 0 0 3 0x40014200 idle1
14040 415138 0 0 3 0x14200 bored softnet
39898 33435 0 0 3 0x14200 bored systqmp
40810 381885 0 0 3 0x14200 bored systq
49451 225234 0 0 3 0x40014200 bored softclock
25224 47189 0 0 3 0x40014200 idle0
1 291222 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{1}> show all locks
Process 41558 (syz-executor0898) thread 0xffff8000ffff7cf0 (361815)
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff828cdd98)
#0 witness_lock+0x4b0
#1 vn_ioctl+0x40
#2 sys_ioctl+0x4b0
#3 syscall+0x4a1
#4 Xsyscall+0x128
ddb{1}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 9471 6345K 6345K 78643K 10561 0
pcb 13 8K 8K 78643K 13 0
rtable 61 2K 2K 78643K 117 0
ifaddr 24 7K 7K 78643K 24 0
counters 40 33K 33K 78643K 40 0
ioctlops 0 0K 2K 78643K 13 0
mount 1 1K 1K 78643K 1 0
vnodes 1182 74K 74K 78643K 1187 0
UFS quota 1 32K 32K 78643K 1 0
UFS mount 5 36K 36K 78643K 5 0
shm 2 1K 1K 78643K 2 0
VM map 2 1K 1K 78643K 2 0
sem 2 0K 0K 78643K 2 0
dirhash 12 2K 2K 78643K 12 0
ACPI 1697 195K 286K 78643K 12598 0
file desc 1 0K 0K 78643K 1 0
proc 47 50K 58K 78643K 284 0
NFS srvsock 1 0K 0K 78643K 1 0
NFS daemon 1 16K 16K 78643K 1 0
in_multi 11 0K 0K 78643K 11 0
ether_multi 1 0K 0K 78643K 1 0
ISOFS mount 1 32K 32K 78643K 1 0
MSDOSFS mount 1 16K 16K 78643K 1 0
ttys 31 148K 148K 78643K 31 0
exec 0 0K 2K 78643K 261 0
pagedep 1 8K 8K 78643K 1 0
inodedep 1 32K 32K 78643K 1 0
newblk 1 0K 0K 78643K 1 0
VM swap 7 26K 26K 78643K 7 0
UVM amap 34 1K 2K 78643K 512 0
UVM aobj 3 2K 2K 78643K 3 0
memdesc 1 4K 4K 78643K 1 0
crypto data 1 1K 1K 78643K 1 0
NDP 3 0K 0K 78643K 3 0
temp 18 3969K 4033K 78643K 1442 0
kqueue 2 2K 2K 78643K 2 0
SYN cache 2 16K 16K 78643K 2 0
ddb{1}> show all pools
Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
arp 64 2 0 0 1 0 1 1 0 8 0
plcache 128 20 0 0 1 0 1 1 0 8 0
rtpcb 120 15 0 13 1 0 1 1 0 8 0
rtentry 112 23 0 1 1 0 1 1 0 8 0
unpcb 120 27 0 19 1 0 1 1 0 8 0
syncache 296 5 0 5 2 1 1 1 0 8 1
tcpcb 736 8 0 5 1 0 1 1 0 8 0
inpcb 304 22 0 16 1 0 1 1 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 96 0 0 6 0 6 6 0 8 0
art_table 32 97 0 0 1 0 1 1 0 8 0
art_node 16 22 0 2 1 0 1 1 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino2pl 256 1389 0 15 86 0 86 86 0 8 0
ffsino 272 1389 0 15 92 0 92 92 0 8 0
nchpl 144 1563 0 31 57 0 57 57 0 8 0
uvmvnodes 72 1398 0 0 26 0 26 26 0 8 0
vnodes 224 1398 0 0 83 0 83 83 0 8 0
namei 1024 3497 0 3497 2 1 1 1 0 8 1
percpumem 16 31 0 0 1 0 1 1 0 8 0
scxspl 216 3330 0 3330 2 1 1 2 0 8 1
plimitpl 152 15 0 9 1 0 1 1 0 8 0
sigapl 424 193 0 166 4 0 4 4 0 8 0
futexpl 56 1 0 0 1 0 1 1 0 8 0
knotepl 112 5 0 0 1 0 1 1 0 8 0
kqueuepl 168 1 0 0 1 0 1 1 0 8 0
pipepl 336 57 0 53 2 1 1 1 0 8 0
fdescpl 496 177 0 166 2 0 2 2 0 8 0
filepl 152 827 0 781 2 0 2 2 0 8 0
lockfpl 104 5 0 4 1 0 1 1 0 8 0
lockfspl 48 3 0 2 1 0 1 1 0 8 0
sessionpl 144 17 0 9 1 0 1 1 0 8 0
pgrppl 48 17 0 9 1 0 1 1 0 8 0
ucredpl 96 63 0 56 1 0 1 1 0 8 0
zombiepl 144 166 0 166 2 1 1 1 0 8 1
processpl 1080 193 0 166 3 1 2 3 0 8 0
procpl 672 195 0 166 3 0 3 3 0 8 0
sockpl 432 64 0 48 2 0 2 2 0 8 0
mcl4k 4096 2 0 0 1 0 1 1 0 8 0
mcl2k 2048 80 0 0 10 0 10 10 0 8 0
mtagpl 96 1 0 0 1 0 1 1 0 8 0
mbufpl 256 95 0 0 6 0 6 6 0 8 0
bufpl 280 1923 0 104 130 0 130 130 0 8 0
anonpl 24 18196 0 17031 11 3 8 10 0 186 0
amapchunkpl 152 472 0 433 3 1 2 3 0 158 0
amappl16 200 67 0 62 1 0 1 1 0 8 0
amappl15 192 1 0 0 1 0 1 1 0 8 0
amappl14 184 22 0 19 1 0 1 1 0 8 0
amappl13 176 12 0 11 2 1 1 1 0 8 0
amappl12 168 9 0 9 1 1 0 1 0 8 0
amappl11 160 41 0 32 1 0 1 1 0 8 0
amappl10 152 8 0 6 1 0 1 1 0 8 0
amappl9 144 231 0 231 2 1 1 1 0 8 1
amappl8 136 56 0 54 1 0 1 1 0 8 0
amappl7 128 183 0 182 1 0 1 1 0 8 0
amappl6 120 52 0 46 1 0 1 1 0 8 0
amappl5 112 319 0 305 1 0 1 1 0 8 0
amappl4 104 246 0 225 1 0 1 1 0 8 0
amappl3 96 91 0 84 1 0 1 1 0 8 0
amappl2 88 749 0 696 2 0 2 2 0 8 0
amappl1 80 12811 0 12404 16 5 11 16 0 8 0
amappl 88 350 0 330 1 0 1 1 0 92 0
dma4096 4096 1 0 1 1 1 0 1 0 8 0
dma1024 1024 1 0 0 1 0 1 1 0 8 0
dma256 256 6 0 6 1 1 0 1 0 8 0
dma128 128 253 0 253 1 1 0 1 0 8 0
dma64 64 6 0 6 1 1 0 1 0 8 0
dma32 32 7 0 7 1 1 0 1 0 8 0
dma16 16 18 0 17 1 0 1 1 0 8 0
aobjpl 64 2 0 0 1 0 1 1 0 8 0
uaddrrnd 24 177 0 166 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 177 0 166 1 0 1 1 0 8 0
vmmpekpl 168 5288 0 5274 1 0 1 1 0 8 0
vmmpepl 168 26505 0 25713 47 11 36 44 0 357 1
vmsppl 368 176 0 166 2 0 2 2 0 8 0
rwobjpl 56 7029 0 6504 12 4 8 12 0 8 0
pdppl 4096 361 0 332 42 13 29 35 0 8 0
pvpl 32 72581 0 69753 31 4 27 27 0 265 2
pmappl 232 176 0 166 1 0 1 1 0 8 0
extentpl 40 58 0 40 1 0 1 1 0 8 0
phpool 112 257 0 17 7 0 7 7 0 8 0
ddb{1}> machine ddbcpu 0
Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp
x86_ipi_db(ffffffff826feff0) at x86_ipi_db+0x1a
x86_ipi_handler() at x86_ipi_handler+0xb7
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23
__mp_lock(ffffffff828cdb90) at __mp_lock+0x129
softintr_dispatch(0) at softintr_dispatch+0x4e
Xsoftclock() at Xsoftclock+0x1f
end of kernel
end trace frame: 0x7f7fffff3fc0, count: 9
ddb{0}> trace
x86_ipi_db(ffffffff826feff0) at x86_ipi_db+0x1a
x86_ipi_handler() at x86_ipi_handler+0xb7
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23
__mp_lock(ffffffff828cdb90) at __mp_lock+0x129
softintr_dispatch(0) at softintr_dispatch+0x4e
Xsoftclock() at Xsoftclock+0x1f
end of kernel
end trace frame: 0x7f7fffff3fc0, count: -6
ddb{0}> machine ddbcpu 1
Stopped at db_enter+0x18: addq $0x8,%rsp
db_enter() at db_enter+0x18
panic(ffffffff82460f22) at panic+0x15e
vrele(fffffd806e5c54e8) at vrele+0x197
ptmioctl(5100,40287401,ffff800021250740,3,ffff8000ffff7cf0) at ptmioctl+0x5b9
VOP_IOCTL(fffffd806e6f8050,40287401,ffff800021250740,3,fffffd807f7b7b40,ffff8000ffff7cf0) at VOP_IOCTL+0x9a
vn_ioctl(fffffd807b79dc78,40287401,ffff800021250740,ffff8000ffff7cf0) at vn_ioctl+0xba
sys_ioctl(ffff8000ffff7cf0,ffff800021250850,ffff8000212508a0) at sys_ioctl+0x4b0
syscall(ffff800021250920) at syscall+0x4a1
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x2a22d1d7fd0, count: 6
ddb{1}> trace
db_enter() at db_enter+0x18
panic(ffffffff82460f22) at panic+0x15e
vrele(fffffd806e5c54e8) at vrele+0x197
ptmioctl(5100,40287401,ffff800021250740,3,ffff8000ffff7cf0) at ptmioctl+0x5b9
VOP_IOCTL(fffffd806e6f8050,40287401,ffff800021250740,3,fffffd807f7b7b40,ffff8000ffff7cf0) at VOP_IOCTL+0x9a
vn_ioctl(fffffd807b79dc78,40287401,ffff800021250740,ffff8000ffff7cf0) at vn_ioctl+0xba
sys_ioctl(ffff8000ffff7cf0,ffff800021250850,ffff8000212508a0) at sys_ioctl+0x4b0
syscall(ffff800021250920) at syscall+0x4a1
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x2a22d1d7fd0, count: -9
ddb{1}>