panic: unix: lock not held
Stopped at db_enter+0x1c: addq $0x8,%rsp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
*215936 26110 0 0x8000002 0 0 syz-executor1534187535
db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437
panic(ffffffff82865988) at panic+0x165 sys/kern/subr_prf.c:198
rw_assert_wrlock(fffffd806ed125c8) at rw_assert_wrlock+0xb7 sys/kern/kern_rwlock.c:387
filt_soread(fffffd807474bbb8,0) at filt_soread+0x123 sys/kern/uipc_socket.c:2237
knote_locked(fffffd806ed126e0,0) at knote_locked+0x78 filter_event sys/kern/kern_event.c:778 [inline]
knote_locked(fffffd806ed126e0,0) at knote_locked+0x78 sys/kern/kern_event.c:1845
sowakeup(fffffd806ed125c0,fffffd806ed12670) at sowakeup+0x82 sys/kern/uipc_socket2.c:611
sorwakeup(fffffd806ed125c0) at sorwakeup+0xfb sys/kern/uipc_socket.c:1791
uipc_dgram_send(fffffd80760e8b88,fffffd806d281e00,fffffd806d281300,0) at uipc_dgram_send+0x1b7 sys/kern/uipc_usrreq.c:585
sosend(fffffd80760e8b88,fffffd806d281300,ffff80002a61ce48,0,0,0) at sosend+0x663
sendit(ffff80002a5d72a0,5,ffff80002a61cfc0,0,ffff80002a61d070) at sendit+0x555 sys/kern/uipc_syscalls.c:786
sys_sendmsg(ffff80002a5d72a0,ffff80002a61d120,ffff80002a61d070) at sys_sendmsg+0x19e sys/kern/uipc_syscalls.c:604
syscall(ffff80002a61d120) at syscall+0x538 sys/arch/amd64/amd64/trap.c:577
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x70c00c0ee8b0, count: 2
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
*cpu0: unix: lock not held
ddb> trace
db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437
panic(ffffffff82865988) at panic+0x165 sys/kern/subr_prf.c:198
rw_assert_wrlock(fffffd806ed125c8) at rw_assert_wrlock+0xb7 sys/kern/kern_rwlock.c:387
filt_soread(fffffd807474bbb8,0) at filt_soread+0x123 sys/kern/uipc_socket.c:2237
knote_locked(fffffd806ed126e0,0) at knote_locked+0x78 filter_event sys/kern/kern_event.c:778 [inline]
knote_locked(fffffd806ed126e0,0) at knote_locked+0x78 sys/kern/kern_event.c:1845
sowakeup(fffffd806ed125c0,fffffd806ed12670) at sowakeup+0x82 sys/kern/uipc_socket2.c:611
sorwakeup(fffffd806ed125c0) at sorwakeup+0xfb sys/kern/uipc_socket.c:1791
uipc_dgram_send(fffffd80760e8b88,fffffd806d281e00,fffffd806d281300,0) at uipc_dgram_send+0x1b7 sys/kern/uipc_usrreq.c:585
sosend(fffffd80760e8b88,fffffd806d281300,ffff80002a61ce48,0,0,0) at sosend+0x663
sendit(ffff80002a5d72a0,5,ffff80002a61cfc0,0,ffff80002a61d070) at sendit+0x555 sys/kern/uipc_syscalls.c:786
sys_sendmsg(ffff80002a5d72a0,ffff80002a61d120,ffff80002a61d070) at sys_sendmsg+0x19e sys/kern/uipc_syscalls.c:604
syscall(ffff80002a61d120) at syscall+0x538 sys/arch/amd64/amd64/trap.c:577
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x70c00c0ee8b0, count: -13
ddb> show registers
rdi 0
rsi 0x1
rbp 0xffff80002a61cab0
rbx 0xffffffff82ca5ff0 cpu_info_full_primary+0x1ff0
rdx 0x3fd
rcx 0
rax 0x1b
r8 0x101010101010101
r9 0x8080808080808080
r10 0x744e97e1a276d896
r11 0xb4281dedd6b4dbfa
r12 0
r13 0
r14 0
r15 0x1
rip 0xffffffff811a086c db_enter+0x1c
cs 0x8
rflags 0x246
rsp 0xffff80002a61caa0
ss 0x10
db_enter+0x1c: addq $0x8,%rsp
ddb> show proc
PROC (syz-executor1534187535) tid=215936 pid=26110 tcnt=1 stat=onproc
flags process=8000002<EXEC> proc=0
runpri=17, usrpri=52, slppri=17, nice=20
wchan=0x0, wmesg=, ps_single=0x0
forw=0xffffffffffffffff, list=0xffff80002a5d6008,0xffffffff82e14630
process=0xffff8000ffff69f0 user=0xffff80002a618000, vmspace=0xfffffd80074a2000
estcpu=2, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0
ddb> ps
PID TID PPID UID S FLAGS WAIT COMMAND
*26110 215936 35576 0 7 0x8000002 syz-executor1534187535
35576 240061 45440 0 3 0x810008a sigsusp ksh
45440 370183 15785 0 3 0x1800009a kqread sshd
45793 354489 1 0 3 0x18100083 ttyin getty
15785 213817 1 0 3 0x18000088 kqread sshd
41307 358715 29069 73 3 0x19100090 kqread syslogd
29069 184757 1 0 3 0x18100082 netio syslogd
16457 468889 1 0 3 0x18100080 kqread resolvd
61778 248055 38398 77 3 0x18100092 kqread dhcpleased
30627 512430 38398 77 3 0x18100092 kqread dhcpleased
38398 52547 1 0 3 0x18000080 kqread dhcpleased
97015 108940 0 0 3 0x14200 bored smr
66159 17835 0 0 3 0x14200 pgzero zerothread
86816 115960 0 0 3 0x14200 aiodoned aiodoned
92801 104633 0 0 3 0x14200 syncer update
26390 15979 0 0 3 0x14200 cleaner cleaner
11696 58498 0 0 3 0x14200 reaper reaper
22833 398391 0 0 3 0x14200 pgdaemon pagedaemon
54567 286057 0 0 3 0x14200 bored viomb
34170 417224 0 0 3 0x40014200 acpi0 acpi0
32243 264711 0 0 3 0x14200 bored softnet3
96098 372896 0 0 3 0x14200 bored softnet2
57812 400789 0 0 3 0x14200 bored softnet1
87376 31174 0 0 3 0x14200 bored softnet0
69130 52153 0 0 3 0x14200 bored systqmp
30157 406578 0 0 3 0x14200 bored systq
57599 69185 0 0 3 0x40014200 tmoslp softclock
6199 30174 0 0 3 0x40014200 idle0
1 213137 0 0 3 0x8000082 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
devbuf 10137 6382K 6413K 166960K 11215 0
pcb 15 10K 10K 166960K 15 0
rtable 58 1K 2K 166960K 112 0
pf 12 6K 6K 166960K 12 0
ifaddr 11 5K 5K 166960K 11 0
ifgroup 17 1K 1K 166960K 17 0
counters 22 16K 16K 166960K 22 0
ioctlops 0 0K 2K 166960K 21 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1259 79K 79K 166960K 1275 0
UFS quota 1 32K 32K 166960K 1 0
UFS mount 5 36K 36K 166960K 5 0
shm 2 1K 1K 166960K 2 0
VM map 2 1K 1K 166960K 2 0
sem 2 0K 0K 166960K 2 0
dirhash 12 2K 2K 166960K 12 0
ACPI 1697 195K 286K 166960K 12548 0
file desc 1 0K 0K 166960K 1 0
proc 55 58K 59K 166960K 246 0
NFS srvsock 1 0K 0K 166960K 1 0
NFS daemon 1 16K 16K 166960K 1 0
in_multi 11 0K 0K 166960K 11 0
ether_multi 1 0K 0K 166960K 1 0
ISOFS mount 1 32K 32K 166960K 1 0
MSDOSFS mount 1 16K 16K 166960K 1 0
ttys 25 122K 122K 166960K 25 0
exec 0 0K 1K 166960K 246 0
tdb 3 0K 0K 166960K 3 0
VM swap 8 62K 64K 166960K 10 0
UVM amap 94 4K 5K 166960K 2132 0
UVM aobj 3 2K 2K 166960K 3 0
pinsyscall 21 42K 48K 166960K 849 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
NDP 3 0K 0K 166960K 3 0
temp 1 6788K 6852K 166960K 3236 0
kqueue 12 18K 18K 166960K 25 0
SYN cache 2 16K 16K 166960K 2 0
ddb> show all pools
Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
rtpcb 120 21 0 18 1 0 1 1 0 8 0
rtentry 112 23 0 1 1 0 1 1 0 8 0
unpcb 144 36 0 21 1 0 1 1 0 8 0
syncache 336 5 0 5 1 0 1 1 0 8 1
tcpqe 32 18 0 18 1 0 1 1 0 8 1
tcpcb 808 8 0 5 1 0 1 1 0 8 0
arp 88 2 0 0 1 0 1 1 0 8 0
inpcb 360 26 0 20 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 1503 0 40 92 0 92 92 0 8 0
ffsino 240 1503 0 40 87 0 87 87 0 8 0
nchpl 144 1687 0 47 61 0 61 61 0 8 0
uvmvnodes 80 1512 0 0 31 0 31 31 0 8 0
vnodes 216 1512 0 0 84 0 84 84 0 8 0
namei 1024 4358 0 4358 1 0 1 1 0 8 1
kstatmem 264 6 0 0 1 0 1 1 0 8 0
scxspl 216 5178 0 5178 2 0 2 2 1 8 2
plimitpl 152 16 0 10 1 0 1 1 0 8 0
sigapl 424 311 0 282 4 0 4 4 0 8 0
knotepl 120 7366 0 7336 2 0 2 2 0 8 1
kqueuepl 184 21 0 13 1 0 1 1 0 8 0
pipepl 288 88 0 85 1 0 1 1 0 8 0
fdescpl 432 295 0 282 2 0 2 2 0 8 0
filepl 120 1139 0 1084 2 0 2 2 0 8 0
lockfpl 104 6 0 4 1 0 1 1 0 8 0
lockfspl 48 4 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 104 66 0 56 1 0 1 1 0 8 0
zombiepl 144 282 0 282 1 0 1 1 0 8 1
processpl 1072 311 0 282 3 0 3 3 0 8 0
procpl 680 311 0 282 3 0 3 3 0 8 0
sockpl 488 83 0 59 4 0 4 4 0 8 0
mcl8k 8192 4 0 4 1 0 1 1 0 8 1
mcl4k 4096 10 0 10 1 0 1 1 0 8 1
mcl2k 2048 12161 0 12121 26 12 14 26 0 8 8
mtagpl 96 4 0 4 1 0 1 1 0 8 1
mbufpl 256 20074 0 20025 15 4 11 15 0 8 7
bufpl 280 2474 0 89 171 0 171 171 0 8 0
anonpl 24 134257 0 132462 23 0 23 23 0 188 12
amapchunkpl 152 7439 0 7308 7 0 7 7 0 158 1
amappl16 200 3216 0 3215 4 0 4 4 0 8 3
amappl15 192 8 0 8 1 0 1 1 0 8 1
amappl14 184 97 0 88 1 0 1 1 0 8 0
amappl13 176 12 0 12 1 0 1 1 0 8 1
amappl12 168 794 0 782 1 0 1 1 0 8 0
amappl11 160 52 0 42 1 0 1 1 0 8 0
amappl10 152 16 0 16 1 0 1 1 0 8 1
amappl9 144 95 0 95 1 0 1 1 0 8 1
amappl8 136 21 0 19 1 0 1 1 0 8 0
amappl7 128 14 0 12 1 0 1 1 0 8 0
amappl6 120 162 0 151 1 0 1 1 0 8 0
amappl5 112 115 0 103 1 0 1 1 0 8 0
amappl4 104 389 0 362 1 0 1 1 0 8 0
amappl3 96 2484 0 2458 1 0 1 1 0 8 0
amappl2 88 575 0 525 2 0 2 2 0 8 0
amappl1 80 8800 0 8396 10 0 10 10 0 8 0
amappl 88 1828 0 1780 2 0 2 2 0 92 0
dma4096 4096 1 0 1 1 0 1 1 0 8 1
dma1024 1024 1 0 0 1 0 1 1 0 8 0
dma256 256 6 0 6 1 0 1 1 0 8 1
dma128 128 253 0 253 1 0 1 1 0 8 1
dma64 64 6 0 6 1 0 1 1 0 8 1
dma32 32 7 0 7 1 0 1 1 0 8 1
dma16 16 18 0 17 1 0 1 1 0 8 0
aobjpl 72 2 0 0 1 0 1 1 0 8 0
uaddrrnd 24 295 0 282 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 295 0 282 1 0 1 1 0 8 0
vmmpekpl 168 5627 0 5610 1 0 1 1 0 8 0
vmmpepl 168 32251 0 31353 46 0 46 46 0 357 1
vmsppl 352 294 0 282 2 0 2 2 0 8 0
rwobjpl 24 16955 0 14842 14 0 14 14 0 8 0
pdppl 4096 596 0 564 48 14 34 40 0 8 2
pvpl 32 226188 0 222145 50 0 50 50 0 265 14
pmappl 216 294 0 282 1 0 1 1 0 8 0
extentpl 40 56 0 38 1 0 1 1 0 8 0
phpool 112 290 0 30 8 0 8 8 0 8 0
ddb> machine ddbcpu 0
No such command
ddb> trace
db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437
panic(ffffffff82865988) at panic+0x165 sys/kern/subr_prf.c:198
rw_assert_wrlock(fffffd806ed125c8) at rw_assert_wrlock+0xb7 sys/kern/kern_rwlock.c:387
filt_soread(fffffd807474bbb8,0) at filt_soread+0x123 sys/kern/uipc_socket.c:2237
knote_locked(fffffd806ed126e0,0) at knote_locked+0x78 filter_event sys/kern/kern_event.c:778 [inline]
knote_locked(fffffd806ed126e0,0) at knote_locked+0x78 sys/kern/kern_event.c:1845
sowakeup(fffffd806ed125c0,fffffd806ed12670) at sowakeup+0x82 sys/kern/uipc_socket2.c:611
sorwakeup(fffffd806ed125c0) at sorwakeup+0xfb sys/kern/uipc_socket.c:1791
uipc_dgram_send(fffffd80760e8b88,fffffd806d281e00,fffffd806d281300,0) at uipc_dgram_send+0x1b7 sys/kern/uipc_usrreq.c:585
sosend(fffffd80760e8b88,fffffd806d281300,ffff80002a61ce48,0,0,0) at sosend+0x663
sendit(ffff80002a5d72a0,5,ffff80002a61cfc0,0,ffff80002a61d070) at sendit+0x555 sys/kern/uipc_syscalls.c:786
sys_sendmsg(ffff80002a5d72a0,ffff80002a61d120,ffff80002a61d070) at sys_sendmsg+0x19e sys/kern/uipc_syscalls.c:604
syscall(ffff80002a61d120) at syscall+0x538 sys/arch/amd64/amd64/trap.c:577
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x70c00c0ee8b0, count: -13
ddb> machine ddbcpu 1
No such command
ddb> trace
db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437
panic(ffffffff82865988) at panic+0x165 sys/kern/subr_prf.c:198
rw_assert_wrlock(fffffd806ed125c8) at rw_assert_wrlock+0xb7 sys/kern/kern_rwlock.c:387
filt_soread(fffffd807474bbb8,0) at filt_soread+0x123 sys/kern/uipc_socket.c:2237
knote_locked(fffffd806ed126e0,0) at knote_locked+0x78 filter_event sys/kern/kern_event.c:778 [inline]
knote_locked(fffffd806ed126e0,0) at knote_locked+0x78 sys/kern/kern_event.c:1845
sowakeup(fffffd806ed125c0,fffffd806ed12670) at sowakeup+0x82 sys/kern/uipc_socket2.c:611
sorwakeup(fffffd806ed125c0) at sorwakeup+0xfb sys/kern/uipc_socket.c:1791
uipc_dgram_send(fffffd80760e8b88,fffffd806d281e00,fffffd806d281300,0) at uipc_dgram_send+0x1b7 sys/kern/uipc_usrreq.c:585
sosend(fffffd80760e8b88,fffffd806d281300,ffff80002a61ce48,0,0,0) at sosend+0x663
sendit(ffff80002a5d72a0,5,ffff80002a61cfc0,0,ffff80002a61d070) at sendit+0x555 sys/kern/uipc_syscalls.c:786
sys_sendmsg(ffff80002a5d72a0,ffff80002a61d120,ffff80002a61d070) at sys_sendmsg+0x19e sys/kern/uipc_syscalls.c:604
syscall(ffff80002a61d120) at syscall+0x538 sys/arch/amd64/amd64/trap.c:577
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x70c00c0ee8b0, count: -13
ddb>