witness: userret: returning with the following locks held:
shared rwlock netlock r = 0 (0xffffffff83874a10)
#0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5bb sys/kern/subr_witness.c:1160
#1 rw_do_enter_read+0x36e sys/kern/kern_rwlock.c:397
#2 sysctl_file+0x17e6 sys/kern/kern_sysctl.c:1769
#3 kern_sysctl+0x251 sys/kern/kern_sysctl.c:526
#4 sys_sysctl+0x3f2 sys/kern/kern_sysctl.c:-1
#5 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#5 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:579
#6 Xsyscall+0x128
panic: witness_warn
Stopped at db_enter+0x25: addq $0x8,%rsp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
123902 17890 0 0 0 1 syz-executor
*141253 18844 -1 0x10 0x4000000 0 syz-executor
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff8338bf48) at panic+0x1e5 sys/kern/subr_prf.c:198
witness_warn(2,0,ffffffff83344572) at witness_warn+0x850 witness_debugger sys/kern/subr_witness.c:2576 [inline]
witness_warn(2,0,ffffffff83344572) at witness_warn+0x850 sys/kern/subr_witness.c:1485
userret(ffff80002a297730) at userret+0x3a4 sys/kern/kern_sig.c:2227
syscall(ffff800031be8ff0) at syscall+0x9c0 mi_syscall_return sys/sys/syscall_mi.h:203 [inline]
syscall(ffff800031be8ff0) at syscall+0x9c0 sys/arch/amd64/amd64/trap.c:600
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xf4a7ff5e0d0, count: 9
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
*cpu0: witness_warn
ddb{0}> trace
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff8338bf48) at panic+0x1e5 sys/kern/subr_prf.c:198
witness_warn(2,0,ffffffff83344572) at witness_warn+0x850 witness_debugger sys/kern/subr_witness.c:2576 [inline]
witness_warn(2,0,ffffffff83344572) at witness_warn+0x850 sys/kern/subr_witness.c:1485
userret(ffff80002a297730) at userret+0x3a4 sys/kern/kern_sig.c:2227
syscall(ffff800031be8ff0) at syscall+0x9c0 mi_syscall_return sys/sys/syscall_mi.h:203 [inline]
syscall(ffff800031be8ff0) at syscall+0x9c0 sys/arch/amd64/amd64/trap.c:600
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xf4a7ff5e0d0, count: -6
ddb{0}> show registers
rdi 0
rsi 0x1
rbp 0xffff800031be8d20
rbx 0xffffffff8382fdd7 cpu_info_full_primary+0x2dd7
rdx 0
rcx 0xffff80002a297730
rax 0xffffffff8382eff0 cpu_info_full_primary+0x1ff0
r8 0x101010101010101
r9 0x8080808080808080
r10 0x80834aced26c7964
r11 0x8d06f12c95ef7384
r12 0xffffffff8382fbd8 cpu_info_full_primary+0x2bd8
r13 0
r14 0
r15 0x1
rip 0xffffffff82907a95 db_enter+0x25
cs 0x8
rflags 0x246
rsp 0xffff800031be8d10
ss 0x10
db_enter+0x25: addq $0x8,%rsp
ddb{0}> show proc
PROC (syz-executor) tid=141253 pid=18844 tcnt=3 stat=onproc
flags process=10<SUGID> proc=4000000<THREAD>
runpri=36, usrpri=86, slppri=36, nice=20
wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0
forw=0xffffffffffffffff, list=0xffff80002a297210,0xffff80002a296030
process=0xffff80003980c9d0 user=0xffff800031be4000, vmspace=0xfffffd806ef1b3c8
estcpu=36, cpticks=4, pctcpu=0.0, user=0, sys=4, intr=0
ddb{0}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
17890 123902 76318 0 7 0 syz-executor
17890 125655 76318 0 3 0x4000080 kqpoll syz-executor
24172 188892 58690 0 2 0 syz-executor
75926 244377 64693 0 2 0 syz-executor
75926 94827 64693 0 3 0x4000080 fsleep syz-executor
18844 89536 46241 -1 2 0x10 syz-executor
*18844 141253 46241 -1 7 0x4000010 syz-executor
18844 417377 46241 -1 3 0x4000010 netlock syz-executor
50417 19011 86025 0 3 0x80 nanoslp syz-executor
50417 449734 86025 0 3 0x4000080 pipewr syz-executor
50417 15638 86025 0 3 0x4000080 fsleep syz-executor
47918 109077 0 0 3 0x14200 acct acct
2641 15989 0 0 3 0x14200 bored sosplice
76318 474500 80849 0 3 0x82 nanoslp syz-executor
69296 149342 80849 0 3 0x82 wait syz-executor
71801 248907 80849 0 3 0x82 nanoslp syz-executor
86025 228355 80849 0 2 0xc82 syz-executor
64693 166329 80849 0 3 0x82 nanoslp syz-executor
58690 323793 80849 0 2 0x2 syz-executor
46241 38562 80849 0 3 0x82 nanoslp syz-executor
46604 371669 80849 0 2 0x2 syz-executor
80849 230487 63154 0 3 0x82 kqread syz-executor
63154 453753 28242 0 3 0x10008a sigsusp ksh
28242 213386 63702 0 3 0x98 kqread sshd-session
63702 187514 4123 0 3 0x92 kqread sshd-session
24396 508045 1 0 3 0x100083 ttyin getty
4123 356854 1 0 3 0x88 kqread sshd
63124 34306 75346 74 3 0x1100092 bpf pflogd
75346 63371 1 0 3 0x80 sbwait pflogd
89559 22684 86476 73 3 0x1100090 kqread syslogd
86476 21952 1 0 3 0x100082 sbwait syslogd
6781 283166 1 0 3 0x100080 kqread resolvd
22977 202823 6673 77 3 0x100092 kqread dhcpleased
85454 214895 6673 77 3 0x100092 kqread dhcpleased
6673 471082 1 0 3 0x80 kqread dhcpleased
84079 166359 0 0 3 0x14200 bored smr
22581 427085 0 0 2 0x14200 zerothread
8738 385588 0 0 3 0x14200 aiodoned aiodoned
18464 424292 0 0 3 0x14200 syncer update
36458 516115 0 0 3 0x14200 cleaner cleaner
45315 210400 0 0 3 0x14200 reaper reaper
23967 212962 0 0 3 0x14200 pgdaemon pagedaemon
97939 212823 0 0 3 0x14200 bored viomb
82795 189424 0 0 3 0x40014200 acpi0 acpi0
40815 229027 0 0 3 0x40014200 idle1
21002 128392 0 0 3 0x14200 bored softnet3
4896 215203 0 0 3 0x14200 bored softnet2
23600 329379 0 0 3 0x14200 bored softnet1
56584 414078 0 0 3 0x14200 bored softnet0
37159 83162 0 0 3 0x14200 bored systqmp
26723 32489 0 0 3 0x14200 bored systq
11588 379876 0 0 3 0x14200 netlock softclockmp
94686 13340 0 0 2 0x40014200 softclock
45625 41555 0 0 3 0x40014200 idle0
1 212727 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{0}> show all locks
Process 18844 (syz-executor) thread 0xffff80002a297730 (141253)
shared rwlock netlock r = 0 (0xffffffff83874a10)
#0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5bb sys/kern/subr_witness.c:1160
#1 rw_do_enter_read+0x36e sys/kern/kern_rwlock.c:397
#2 sysctl_file+0x17e6 sys/kern/kern_sysctl.c:1769
#3 kern_sysctl+0x251 sys/kern/kern_sysctl.c:526
#4 sys_sysctl+0x3f2 sys/kern/kern_sysctl.c:-1
#5 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#5 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:579
#6 Xsyscall+0x128
Process 11588 (softclockmp) thread 0xffff8000ffffe290 (379876)
shared rwlock timeout r = 0 (0xffffffff8384f5e8)
#0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5bb sys/kern/subr_witness.c:1160
#1 timeout_run+0x115 sys/kern/kern_timeout.c:690
#2 softclock_thread_run+0xec sys/kern/kern_timeout.c:838
#3 softclock_thread_mp+0x8f sys/kern/kern_timeout.c:873
#4 proc_trampoline+0x10
ddb{0}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 10227 11367K 11376K 166960K 11987 0
pcb 18 12K 12K 166960K 61 0
rtable 168 6K 7K 166960K 393 0
pf 36 18K 21K 166960K 81 0
ifaddr 32 4K 7K 166960K 60 0
ifgroup 55 2K 2K 166960K 90 0
sysctl 3 1K 9K 166960K 9 0
counters 68 36K 37K 166960K 96 0
ioctlops 0 0K 4K 166960K 1538 0
iov 0 0K 12K 166960K 16 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1435 90K 91K 166960K 1757 0
UFS quota 1 32K 32K 166960K 1 0
UFS mount 5 36K 36K 166960K 5 0
shm 2 1K 5K 166960K 5 0
VM map 2 1K 1K 166960K 2 0
sem 10 0K 0K 166960K 13 0
dirhash 12 2K 2K 166960K 15 0
ACPI 1692 195K 286K 166960K 12470 0
file desc 18 65K 106K 166960K 469 0
sigio 0 0K 0K 166960K 5 0
proc 72 91K 128K 166960K 579 0
subproc 72 4K 4K 166960K 72 0
NFS srvsock 1 0K 0K 166960K 1 0
NFS daemon 1 16K 16K 166960K 1 0
ip_moptions 0 0K 0K 166960K 33 0
in_multi 64 4K 7K 166960K 119 0
ether_multi 1 0K 0K 166960K 5 0
mrt 2 0K 0K 166960K 4 0
ISOFS mount 1 32K 32K 166960K 1 0
MSDOSFS mount 1 16K 16K 166960K 1 0
ttys 97 440K 440K 166960K 97 0
exec 0 0K 1K 166960K 399 0
fusefs mount 1 32K 32K 166960K 1 0
tdb 3 0K 0K 166960K 3 0
VM swap 8 62K 64K 166960K 10 0
UVM amap 247 160K 169K 166960K 5923 0
UVM aobj 10 2K 2K 166960K 10 0
pinsyscall 43 86K 101K 166960K 1540 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
ip6_options 0 0K 0K 166960K 13 0
NDP 12 0K 1K 166960K 41 0
temp 76 8696K 8768K 166960K 17317 0
kqueue 13 20K 30K 166960K 77 0
SYN cache 2 16K 16K 166960K 2 0
ddb{0}> show all pools
Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
plcache 128 26 0 0 1 0 1 1 0 8 0
rtpcb 120 53 0 48 1 0 1 1 0 8 0
rtentry 176 120 0 47 5 0 5 5 0 8 0
unpcb 144 519 0 501 6 0 6 6 0 8 5
syncache 336 3 0 3 1 1 0 1 0 8 0
tcpcb 808 72 0 66 1 0 1 1 0 8 0
arp 128 21 0 9 1 0 1 1 0 8 0
inpcb 328 309 0 298 4 0 4 4 0 8 2
nd6 144 26 0 10 1 0 1 1 0 8 0
pkpcb 40 4 0 4 1 0 1 1 0 8 1
kcovpl 48 8 0 0 1 0 1 1 0 8 0
mppekey 1024 1 0 1 1 0 1 1 0 8 1
ppxss 1192 9 0 9 1 0 1 1 0 8 1
pppxif 1504 2 0 2 1 0 1 1 0 8 1
pfstscr 40 2 0 1 1 0 1 1 0 8 0
pffrag 232 2 0 0 1 0 1 1 0 482 0
pffrnode 88 2 0 0 1 0 1 1 0 8 0
pffrent 40 4 0 2 1 0 1 1 0 8 0
pfosfp 40 1428 0 1005 5 0 5 5 0 8 0
pfosfpen 112 1428 0 714 21 0 21 21 0 8 0
pfrktable 1344 1 0 1 1 0 1 1 0 8 1
pftag 88 1 0 1 1 0 1 1 0 8 1
pfstitem 24 42 0 0 1 0 1 1 0 8 0
pfstkey 128 44 0 2 2 0 2 2 0 8 0
pfstate 384 42 0 1 5 0 5 5 0 8 0
pfrule 1344 36 0 27 2 1 1 2 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 475 0 162 29 2 27 29 0 8 3
art_table 32 476 0 162 4 0 4 4 0 8 0
art_node 16 119 0 54 1 0 1 1 0 8 0
sysvmsgpl 40 39 0 35 1 0 1 1 0 8 0
semupl 112 1 0 1 1 0 1 1 0 8 1
semapl 112 10 0 2 1 0 1 1 0 8 0
shmpl 112 7 0 0 1 0 1 1 0 8 0
dirhash 1024 19 0 2 3 0 3 3 0 8 0
dino2pl 256 2172 0 666 95 0 95 95 0 8 0
ffsino 288 2172 0 666 109 0 109 109 0 8 0
nchpl 144 2802 0 1114 64 0 64 64 0 8 0
uvmvnodes 80 2542 0 0 52 0 52 52 0 8 0
vnodes 216 2542 0 0 142 0 142 142 0 8 0
namei 1024 8985 0 8985 2 1 1 2 0 8 1
percpumem 16 63 0 14 1 0 1 1 0 8 0
kstatmem 264 50 0 22 3 0 3 3 0 8 1
scsiplug 72 2 0 2 1 0 1 1 0 8 1
scxspl 216 9067 0 9067 10 2 8 8 1 8 8
plimitpl 152 59 0 42 1 0 1 1 0 8 0
sigapl 424 762 0 710 7 1 6 7 0 8 0
knotepl 120 522 0 0 16 0 16 16 0 8 0
kqueuepl 224 173 0 163 5 4 1 5 0 8 0
pipepl 336 196 0 168 8 0 8 8 0 8 5
fdescpl 520 742 0 710 3 0 3 3 0 8 0
filepl 160 3872 0 3648 16 0 16 16 0 8 5
lockfpl 104 94 0 92 1 0 1 1 0 8 0
lockfspl 48 44 0 42 1 0 1 1 0 8 0
sessionpl 144 22 0 13 1 0 1 1 0 8 0
pgrppl 48 33 0 16 1 0 1 1 0 8 0
ucredpl 104 329 0 313 1 0 1 1 0 8 0
zombiepl 144 713 0 710 1 0 1 1 0 8 0
processpl 1240 762 0 710 5 0 5 5 0 8 0
procpl 656 1325 0 1267 6 0 6 6 0 8 0
srpgc 96 6 0 6 1 0 1 1 0 8 1
sosppl 168 1 0 1 1 0 1 1 0 8 1
sockpl 728 902 0 866 21 9 12 16 0 8 8
mcl64k 65536 4 0 0 1 0 1 1 0 8 0
mcl16k 16384 1 0 0 1 0 1 1 0 8 0
mcl12k 12288 1 0 0 1 0 1 1 0 8 0
mcl8k 8192 3 0 0 1 0 1 1 0 8 0
mcl4k 4096 107 0 0 14 0 14 14 0 8 0
mcl2k 2048 78 0 0 10 0 10 10 0 8 0
mtagpl 96 110 0 0 3 0 3 3 0 8 0
mbufpl 256 1244 0 0 78 0 78 78 0 8 0
bufpl 280 2932 0 126 201 0 201 201 0 8 0
anonpl 32 7630 0 0 62 0 62 62 0 246 0
amapchunkpl 152 18344 0 17831 27 0 27 27 0 158 6
amappl16 200 2613 0 2581 18 3 15 15 0 8 12
amappl15 192 5 0 5 1 1 0 1 0 8 0
amappl14 184 114 0 102 1 0 1 1 0 8 0
amappl13 176 9 0 9 1 1 0 1 0 8 0
amappl12 168 1375 0 1344 4 1 3 3 0 8 0
amappl11 160 53 0 39 1 0 1 1 0 8 0
amappl10 152 50 0 50 1 1 0 1 0 8 0
amappl9 144 251 0 251 1 1 0 1 0 8 0
amappl8 136 21 0 19 1 0 1 1 0 8 0
amappl7 128 115 0 103 1 0 1 1 0 8 0
amappl6 120 176 0 173 1 0 1 1 0 8 0
amappl5 112 124 0 113 1 0 1 1 0 8 0
amappl4 104 309 0 289 1 0 1 1 0 8 0
amappl3 96 3463 0 3345 4 0 4 4 0 8 0
amappl2 88 638 0 576 2 0 2 2 0 8 0
amappl1 80 9416 0 8807 15 1 14 15 0 8 1
amappl 88 5209 0 5037 5 0 5 5 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 72 9 0 0 1 0 1 1 0 8 0
uaddrrnd 24 742 0 710 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 742 0 710 1 0 1 1 0 8 0
vmmpekpl 168 7760 0 7718 3 0 3 3 0 8 0
vmmpepl 168 52618 0 50578 101 0 101 101 0 357 9
vmsppl 480 741 0 710 5 1 4 5 0 8 0
rwobjpl 72 18885 0 15384 66 0 66 66 0 8 2
pdppl 4096 1491 0 1420 95 24 71 83 0 8 0
pvpl 32 15196 0 0 123 0 123 123 0 265 0
pmappl 256 741 0 710 3 0 3 3 0 8 0
extentpl 40 45 0 27 1 0 1 1 0 8 0
phpool 112 456 0 30 13 0 13 13 0 8 0
ddb{0}> machine ddbcpu 0
Invalid cpu 0
ddb{0}> trace
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff8338bf48) at panic+0x1e5 sys/kern/subr_prf.c:198
witness_warn(2,0,ffffffff83344572) at witness_warn+0x850 witness_debugger sys/kern/subr_witness.c:2576 [inline]
witness_warn(2,0,ffffffff83344572) at witness_warn+0x850 sys/kern/subr_witness.c:1485
userret(ffff80002a297730) at userret+0x3a4 sys/kern/kern_sig.c:2227
syscall(ffff800031be8ff0) at syscall+0x9c0 mi_syscall_return sys/sys/syscall_mi.h:203 [inline]
syscall(ffff800031be8ff0) at syscall+0x9c0 sys/arch/amd64/amd64/trap.c:600
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xf4a7ff5e0d0, count: -6
ddb{0}> machine ddbcpu 1