panic: vput: ref cnt
Stopped at db_enter+0x18: addq $0x8,%rsp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
*307047 84887 0 0 0 0K syz-executor7760
79340 3092 0 0 0 1 syz-executor7760
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398
panic() at panic+0x15c sys/kern/subr_prf.c:207
vput(fffffd8076dcb268) at vput+0x14b sys/kern/vfs_subr.c:750
vn_close(fffffd8076dcb268,2,fffffd807f7c6ae0,ffff800020afe9e8) at vn_close+0xfb sys/kern/vfs_vnops.c:291
sys_acct(ffff800020afe9e8,ffff800020bc3988,ffff800020bc39f0) at sys_acct+0x15b sys/kern/kern_acct.c:134
syscall(ffff800020bc3a60) at syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline]
syscall(ffff800020bc3a60) at syscall+0x552 sys/arch/amd64/amd64/trap.c:555
Xsyscall(6,0,2,0,431bde82d7b634db,7f7fffff78b0) at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7fffff7910, count: 8
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{0}>
ddb{0}> set $lines = 0
ddb{0}> set $maxwidth = 0
ddb{0}> show panic
vput: ref cnt
ddb{0}> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398
panic() at panic+0x15c sys/kern/subr_prf.c:207
vput(fffffd8076dcb268) at vput+0x14b sys/kern/vfs_subr.c:750
vn_close(fffffd8076dcb268,2,fffffd807f7c6ae0,ffff800020afe9e8) at vn_close+0xfb sys/kern/vfs_vnops.c:291
sys_acct(ffff800020afe9e8,ffff800020bc3988,ffff800020bc39f0) at sys_acct+0x15b sys/kern/kern_acct.c:134
syscall(ffff800020bc3a60) at syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline]
syscall(ffff800020bc3a60) at syscall+0x552 sys/arch/amd64/amd64/trap.c:555
Xsyscall(6,0,2,0,431bde82d7b634db,7f7fffff78b0) at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7fffff7910, count: -7
ddb{0}> show registers
rdi 0
rsi 0x1
rbp 0xffff800020bc3700
rbx 0xffff800020bc37b0
rdx 0x8b
rcx 0x2
rax 0x1
r8 0xffffffff815a9073 kprintf+0x173
r9 0x1
r10 0x277b1cf6cdabbe2
r11 0xe9d34a32f11cd0f0
r12 0x3000000008
r13 0xffff800020bc3710
r14 0x100
r15 0x1
rip 0xffffffff81e595e8 db_enter+0x18
cs 0x8
rflags 0x246
rsp 0xffff800020bc36f0
ss 0x10
db_enter+0x18: addq $0x8,%rsp
ddb{0}> show proc
PROC (syz-executor7760) pid=307047 stat=onproc
flags process=0 proc=0
pri=32, usrpri=53, nice=20
forw=0xffffffffffffffff, list=0xffff800020afe008,0xffffffff8236fbe0
process=0xffff800020b7d180 user=0xffff800020bbe000, vmspace=0xfffffd807effe000
estcpu=12, cpticks=1, pctcpu=0.0
user=0, sys=1, intr=0
ddb{0}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
*84887 307047 5211 0 7 0 syz-executor7760
3092 79340 60010 0 7 0 syz-executor7760
3591 52504 0 0 3 0x14200 acct acct
60010 292771 79806 0 3 0x80 nanosleep syz-executor7760
5211 59744 79806 0 3 0x80 nanosleep syz-executor7760
79806 471208 93309 0 3 0x82 nanosleep syz-executor7760
93309 115215 35169 0 3 0x10008a pause ksh
35169 453254 44798 0 3 0x92 select sshd
27835 84376 1 0 3 0x100083 ttyin getty
44798 442806 1 0 3 0x80 select sshd
59938 160657 20544 74 3 0x100092 bpf pflogd
20544 458131 1 0 3 0x80 netio pflogd
43275 503730 75348 73 2 0x100090 syslogd
75348 354477 1 0 3 0x100082 netio syslogd
55480 396975 1 77 3 0x100090 poll dhclient
6226 429921 1 0 3 0x80 poll dhclient
65912 3220 0 0 3 0x14200 pgzero zerothread
16012 86214 0 0 3 0x14200 aiodoned aiodoned
13817 49093 0 0 3 0x14200 syncer update
77691 264412 0 0 3 0x14200 cleaner cleaner
65480 444097 0 0 3 0x14200 reaper reaper
13029 68349 0 0 3 0x14200 pgdaemon pagedaemon
62993 479602 0 0 3 0x14200 bored crynlk
62871 64701 0 0 3 0x14200 bored crypto
67644 376495 0 0 3 0x40014200 acpi0 acpi0
77362 139830 0 0 3 0x40014200 idle1
11434 508851 0 0 3 0x14200 bored softnet
69668 356425 0 0 3 0x14200 bored systqmp
54868 194131 0 0 3 0x14200 bored systq
9257 74611 0 0 3 0x40014200 bored softclock
20404 310548 0 0 3 0x40014200 idle0
96199 102066 0 0 3 0x14200 bored smr
1 49464 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{0}> show all locks
Process 84887 (syz-executor7760) thread 0xffff800020afe9e8 (307047)
exclusive rrwlock inode r = 0 (0xfffffd806d9ff3d8)
#0 witness_lock+0x52e sys/kern/subr_witness.c:1163
#1 rw_enter+0x46d sys/kern/kern_rwlock.c:306
#2 rrw_enter+0x4f sys/kern/kern_rwlock.c:435
#3 VOP_LOCK+0x4b sys/kern/vfs_vops.c:602
#4 vn_close+0xb9 vn_lock sys/kern/vfs_vnops.c:561 [inline]
#4 vn_close+0xb9 sys/kern/vfs_vnops.c:288
#5 sys_acct+0x15b sys/kern/kern_acct.c:134
#6 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline]
#6 syscall+0x552 sys/arch/amd64/amd64/trap.c:555
#7 Xsyscall+0x128
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff823822f8)
#0 witness_lock+0x52e sys/kern/subr_witness.c:1163
#1 __mp_acquire_count+0x51 sys/kern/kern_lock.c:227
#2 mi_switch+0x38f sys/kern/sched_bsd.c:441
#3 sleep_finish+0x113 sys/kern/kern_synch.c:373
#4 rw_enter+0x366 sys/kern/kern_rwlock.c:282
#5 rrw_enter+0x4f sys/kern/kern_rwlock.c:435
#6 VOP_LOCK+0x4b sys/kern/vfs_vops.c:602
#7 vn_close+0xb9 vn_lock sys/kern/vfs_vnops.c:561 [inline]
#7 vn_close+0xb9 sys/kern/vfs_vnops.c:288
#8 sys_acct+0x15b sys/kern/kern_acct.c:134
#9 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline]
#9 syscall+0x552 sys/arch/amd64/amd64/trap.c:555
#10 Xsyscall+0x128
ddb{0}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim
devbuf 9452 6383K 6384K 78643K 10539 0 0
pcb 13 8K 8K 78643K 13 0 0
rtable 61 2K 2K 78643K 126 0 0
ifaddr 25 7K 7K 78643K 26 0 0
counters 39 33K 33K 78643K 39 0 0
ioctlops 0 0K 4K 78643K 1467 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 1K 1K 78643K 2 0 0
sem 2 0K 0K 78643K 2 0 0
dirhash 12 2K 2K 78643K 12 0 0
ACPI 1808 196K 290K 78643K 12765 0 0
file desc 1 0K 0K 78643K 1 0 0
proc 52 50K 58K 78643K 334 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 179 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 66 3K 4K 78643K 825 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 4 0K 0K 78643K 4 0 0
temp 39 2732K 2796K 78643K 2004 0 0
SYN cache 2 16K 16K 78643K 2 0 0
ddb{0}> 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 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 29 0 19 1 0 1 1 0 8 0
syncache 264 5 0 5 2 1 1 1 0 8 1
tcpcb 544 8 0 5 1 0 1 1 0 8 0
inpcb 280 29 0 23 1 0 1 1 0 8 0
pfosfp 40 846 0 423 5 0 5 5 0 8 0
pfosfpen 112 1428 0 714 21 0 21 21 0 8 0
pfstitem 24 8 0 2 1 0 1 1 0 8 0
pfstkey 112 8 0 2 1 0 1 1 0 8 0
pfstate 328 8 0 2 1 0 1 1 0 8 0
pfrule 1360 21 0 16 2 1 1 2 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 97 0 0 7 0 7 7 0 8 0
art_table 32 98 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 1414 0 25 45 0 45 45 0 8 0
ffsino 272 1414 0 25 93 0 93 93 0 8 0
nchpl 144 1613 0 63 58 0 58 58 0 8 0
uvmvnodes 72 1424 0 0 26 0 26 26 0 8 0
vnodes 200 1424 0 0 75 0 75 75 0 8 0
namei 1024 3805 0 3805 2 1 1 1 0 8 1
percpumem 16 30 0 0 1 0 1 1 0 8 0
scxspl 192 2522 0 2522 8 7 1 6 0 8 1
plimitpl 152 14 0 8 1 0 1 1 0 8 0
sigapl 432 213 0 197 2 0 2 2 0 8 0
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 112 134 0 127 2 1 1 1 0 8 0
fdescpl 488 214 0 197 3 0 3 3 0 8 0
filepl 152 993 0 944 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 18 0 9 1 0 1 1 0 8 0
pgrppl 48 18 0 9 1 0 1 1 0 8 0
ucredpl 96 52 0 43 1 0 1 1 0 8 0
zombiepl 144 197 0 197 2 1 1 1 0 8 1
processpl 896 230 0 197 4 0 4 4 0 8 0
procpl 632 230 0 197 3 0 3 3 0 8 0
sockpl 384 73 0 55 2 0 2 2 0 8 0
mcl4k 4096 3 0 0 1 0 1 1 0 8 0
mcl2k 2048 86 0 0 9 0 9 9 0 8 0
mtagpl 80 1 0 0 1 0 1 1 0 8 0
mbufpl 256 105 0 0 6 0 6 6 0 8 0
bufpl 256 2177 0 276 119 0 119 119 0 8 0
anonpl 16 20274 0 18988 7 1 6 7 0 125 0
amapchunkpl 152 545 0 504 2 0 2 2 0 158 0
amappl16 192 91 0 81 1 0 1 1 0 8 0
amappl14 176 38 0 34 1 0 1 1 0 8 0
amappl12 160 10 0 10 2 1 1 1 0 8 1
amappl11 152 51 0 36 1 0 1 1 0 8 0
amappl10 144 56 0 54 1 0 1 1 0 8 0
amappl9 136 426 0 425 1 0 1 1 0 8 0
amappl8 128 100 0 96 1 0 1 1 0 8 0
amappl7 120 21 0 20 1 0 1 1 0 8 0
amappl6 112 47 0 42 1 0 1 1 0 8 0
amappl5 104 145 0 129 1 0 1 1 0 8 0
amappl4 96 466 0 442 1 0 1 1 0 8 0
amappl3 88 158 0 147 1 0 1 1 0 8 0
amappl2 80 770 0 712 2 0 2 2 0 8 0
amappl1 72 13806 0 13375 15 5 10 15 0 8 0
amappl 80 429 0 404 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 24 214 0 197 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 214 0 197 1 0 1 1 0 8 0
vmmpekpl 168 5628 0 5607 2 0 2 2 0 8 0
vmmpepl 168 29589 0 28653 51 10 41 47 0 357 0
vmsppl 368 213 0 197 2 0 2 2 0 8 0
pdppl 4096 436 0 394 6 0 6 6 0 8 0
pvpl 32 80908 0 77796 32 4 28 28 0 265 1
pmappl 232 213 0 197 1 0 1 1 0 8 0
extentpl 40 41 0 26 1 0 1 1 0 8 0
phpool 112 254 0 4 8 0 8 8 0 8 0