panic: vput: v_writecount != 0
Stopped at db_enter+0x18: addq $0x8,%rsp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398
panic() at panic+0x15c sys/kern/subr_prf.c:212
vput(fffffd803c54b968) at vput+0x187 sys/kern/vfs_subr.c:759
vn_closefile(fffffd8036164620,ffff8000ffff4778) at vn_closefile+0x15b sys/kern/vfs_vnops.c:589
fdrop(fffffd8036164620,ffff8000ffff4778) at fdrop+0xc9 sys/kern/kern_descrip.c:1269
closef(fffffd8036164620,ffff8000ffff4778) at closef+0x118 sys/kern/kern_descrip.c:1253
fdfree(ffff8000ffff4778) at fdfree+0xf7 sys/kern/kern_descrip.c:1185
exit1(ffff8000ffff4778,0,1) at exit1+0x32f sys/kern/kern_exit.c:196
sys_exit(ffff8000ffff4778,ffff80001497ad70,ffff80001497ade0) at sys_exit+0x17 sys/kern/kern_exit.c:94
syscall(ffff80001497ae40) at syscall+0x508
Xsyscall(6,1,9c38304f000,1,7f7ffffcf5b8,0) at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7ffffcf530, count: 4
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>
ddb> set $lines = 0
ddb> set $maxwidth = 0
ddb> show panic
vput: v_writecount != 0
ddb> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398
panic() at panic+0x15c sys/kern/subr_prf.c:212
vput(fffffd803c54b968) at vput+0x187 sys/kern/vfs_subr.c:759
vn_closefile(fffffd8036164620,ffff8000ffff4778) at vn_closefile+0x15b sys/kern/vfs_vnops.c:589
fdrop(fffffd8036164620,ffff8000ffff4778) at fdrop+0xc9 sys/kern/kern_descrip.c:1269
closef(fffffd8036164620,ffff8000ffff4778) at closef+0x118 sys/kern/kern_descrip.c:1253
fdfree(ffff8000ffff4778) at fdfree+0xf7 sys/kern/kern_descrip.c:1185
exit1(ffff8000ffff4778,0,1) at exit1+0x32f sys/kern/kern_exit.c:196
sys_exit(ffff8000ffff4778,ffff80001497ad70,ffff80001497ade0) at sys_exit+0x17 sys/kern/kern_exit.c:94
syscall(ffff80001497ae40) at syscall+0x508
Xsyscall(6,1,9c38304f000,1,7f7ffffcf5b8,0) at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7ffffcf530, count: -11
ddb> show registers
rdi 0
rsi 0x1
rbp 0xffff80001497aa60
rbx 0xffff80001497ab10
rdx 0x2
rcx 0x1
rax 0x1
r8 0xffff80001497aa20
r9 0x1
r10 0x664fd4b721e44895
r11 0xf56480a474f879e4
r12 0x3000000008
r13 0xffff80001497aa70
r14 0x100
r15 0x1
rip 0xffffffff8125b5f8 db_enter+0x18
cs 0x8
rflags 0x246
rsp 0xffff80001497aa50
ss 0x10
db_enter+0x18: addq $0x8,%rsp
ddb> show proc
PROC (syz-executor7698) pid=26392 stat=onproc
flags process=100a<EXEC,EXITING,SINGLEEXIT> proc=2000<WEXIT>
pri=32, usrpri=51, nice=20
forw=0xffffffffffffffff, list=0xffff8000ffff5158,0xffffffff822c3340
process=0xffff800014942018 user=0xffff800014975000, vmspace=0xfffffd803f014110
estcpu=1, cpticks=2, pctcpu=0.17
user=0, sys=2, intr=0
ddb> ps
PID TID PPID UID S FLAGS WAIT COMMAND
73377 257695 64921 0 3 0x10008a pause ksh
64921 447245 93482 0 3 0x92 select sshd
49959 197825 1 0 3 0x100083 ttyin getty
93482 71649 1 0 3 0x80 select sshd
64105 281332 79172 73 2 0x100090 syslogd
79172 151659 1 0 3 0x100082 netio syslogd
76126 399401 1 77 3 0x100090 poll dhclient
1099 97417 1 0 3 0x80 poll dhclient
58472 449 0 0 2 0x14200 zerothread
37070 99317 0 0 3 0x14200 aiodoned aiodoned
59478 72147 0 0 3 0x14200 syncer update
23860 494830 0 0 3 0x14200 cleaner cleaner
87394 42790 0 0 3 0x14200 reaper reaper
78351 261454 0 0 3 0x14200 pgdaemon pagedaemon
62103 412180 0 0 3 0x14200 bored crynlk
82040 126227 0 0 3 0x14200 bored crypto
49473 301178 0 0 3 0x40014200 acpi0 acpi0
18939 518880 0 0 3 0x14200 bored softnet
1055 49461 0 0 3 0x14200 bored systqmp
86508 155873 0 0 3 0x14200 bored systq
37191 156076 0 0 2 0x40014200 softclock
54492 451475 0 0 3 0x40014200 idle0
30700 267962 0 0 3 0x14200 bored smr
1 385230 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb> show all locks
No such command
ddb> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim
devbuf 9428 6307K 6309K 78643K 10523 0 0
pcb 13 8K 8K 78643K 13 0 0
rtable 61 1K 2K 78643K 115 0 0
ifaddr 21 7K 7K 78643K 21 0 0
counters 19 16K 16K 78643K 19 0 0
ioctlops 0 0K 2K 78643K 13 0 0
mount 1 1K 1K 78643K 1 0 0
vnodes 1181 74K 74K 78643K 1186 0 0
UFS quota 1 32K 32K 78643K 1 0 0
UFS mount 5 36K 36K 78643K 5 0 0
shm 2 1K 1K 78643K 2 0 0
VM map 2 0K 0K 78643K 2 0 0
sem 2 0K 0K 78643K 2 0 0
dirhash 12 2K 2K 78643K 12 0 0
ACPI 1793 195K 288K 78643K 12645 0 0
file desc 1 0K 0K 78643K 1 0 0
proc 40 30K 38K 78643K 257 0 0
NFS srvsock 1 0K 0K 78643K 1 0 0
NFS daemon 1 16K 16K 78643K 1 0 0
in_multi 11 0K 0K 78643K 11 0 0
ether_multi 1 0K 0K 78643K 1 0 0
ISOFS mount 1 32K 32K 78643K 1 0 0
MSDOSFS mount 1 16K 16K 78643K 1 0 0
ttys 18 79K 79K 78643K 18 0 0
exec 0 0K 1K 78643K 152 0 0
pagedep 1 8K 8K 78643K 1 0 0
inodedep 1 32K 32K 78643K 1 0 0
newblk 1 0K 0K 78643K 1 0 0
VM swap 7 26K 26K 78643K 7 0 0
UVM amap 61 3K 3K 78643K 709 0 0
UVM aobj 2 2K 2K 78643K 2 0 0
memdesc 1 4K 4K 78643K 1 0 0
crypto data 1 1K 1K 78643K 1 0 0
NDP 3 0K 0K 78643K 3 0 0
temp 30 2707K 2771K 78643K 1715 0 0
SYN cache 2 16K 16K 78643K 2 0 0
ddb> 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
rtpcb 80 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 264 5 0 5 1 0 1 1 0 8 1
tcpcb 544 8 0 5 1 0 1 1 0 8 0
inpcb 280 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
dino1pl 128 1393 0 17 45 0 45 45 0 8 0
ffsino 240 1393 0 17 81 0 81 81 0 8 0
nchpl 144 1578 0 43 57 0 57 57 0 8 0
uvmvnodes 72 1402 0 0 26 0 26 26 0 8 0
vnodes 200 1402 0 0 74 0 74 74 0 8 0
namei 1024 3371 0 3371 2 1 1 1 0 8 1
scxspl 192 18766 0 18766 8 7 1 6 0 8 1
plimitpl 152 13 0 8 1 0 1 1 0 8 0
sigapl 432 176 0 166 2 0 2 2 0 8 0
futexpl 56 7 0 7 1 0 1 1 0 8 1
knotepl 112 5 0 0 1 0 1 1 0 8 0
kqueuepl 104 1 0 0 1 0 1 1 0 8 0
pipepl 112 118 0 111 2 1 1 1 0 8 0
fdescpl 424 177 0 166 2 0 2 2 0 8 0
filepl 120 842 0 798 2 0 2 2 0 8 0
lockfpl 104 6 0 6 1 1 0 1 0 8 0
lockfspl 48 3 0 3 1 1 0 1 0 8 0
sessionpl 112 17 0 9 1 0 1 1 0 8 0
pgrppl 48 17 0 9 1 0 1 1 0 8 0
ucredpl 96 47 0 40 1 0 1 1 0 8 0
zombiepl 144 167 0 166 2 1 1 1 0 8 0
processpl 864 191 0 166 4 0 4 4 0 8 0
procpl 632 197 0 172 3 0 3 3 0 8 0
sockpl 384 64 0 48 2 0 2 2 0 8 0
mcl4k 4096 10 0 10 1 0 1 1 0 8 1
mcl2k 2048 6105 0 6070 8 2 6 8 0 8 1
mtagpl 80 2 0 2 1 1 0 1 0 8 0
mbufpl 256 10426 0 10380 7 3 4 6 0 8 0
bufpl 256 10270 0 5372 624 0 624 624 0 8 315
anonpl 16 22051 0 16769 24 2 22 22 0 62 0
amapchunkpl 152 503 0 441 3 0 3 3 0 158 0
amappl16 192 320 0 73 13 0 13 13 0 8 0
amappl14 176 36 0 32 1 0 1 1 0 8 0
amappl12 160 4 0 4 1 1 0 1 0 8 0
amappl11 152 40 0 29 1 0 1 1 0 8 0
amappl10 144 45 0 45 2 1 1 1 0 8 1
amappl9 136 389 0 388 1 0 1 1 0 8 0
amappl8 128 84 0 79 1 0 1 1 0 8 0
amappl7 120 15 0 14 1 0 1 1 0 8 0
amappl6 112 41 0 37 1 0 1 1 0 8 0
amappl5 104 138 0 129 1 0 1 1 0 8 0
amappl4 96 399 0 378 1 0 1 1 0 8 0
amappl3 88 147 0 136 1 0 1 1 0 8 0
amappl2 80 694 0 638 3 1 2 2 0 8 0
amappl1 72 12164 0 11763 16 6 10 16 0 8 0
amappl 80 371 0 345 1 0 1 1 0 84 0
dma4096 4096 1 0 1 1 1 0 1 0 8 0
dma256 256 6 0 6 1 1 0 1 0 8 0
dma64 64 259 0 259 1 1 0 1 0 8 0
dma32 32 7 0 7 1 1 0 1 0 8 0
dma16 16 17 0 17 1 1 0 1 0 8 0
aobjpl 64 1 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 5342 0 5327 1 0 1 1 0 8 0
vmmpepl 168 26052 0 25007 64 18 46 48 0 357 0
vmsppl 272 176 0 166 1 0 1 1 0 8 0
pdppl 4096 360 0 332 5 0 5 5 0 8 0
pvpl 32 75499 0 68609 61 5 56 56 0 265 0
pmappl 200 176 0 166 1 0 1 1 0 8 0
extentpl 40 41 0 26 1 0 1 1 0 8 0
phpool 112 742 0 8 21 0 21 21 0 8 0
ddb>