witness: shared lpaock of (rwlock) mnaddr while excluisively locked
c: excl->share
Stopped at db_enter+0x25: addq $0x8,%rsp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
113507 74319 0 0 0 0 syz-executor
*216979 44066 0 0x14000 0x200 1 softclockmp
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff833b5a1c) at panic+0x1e5 sys/kern/subr_prf.c:198
witness_checkorder(ffff80000159d878,1,0) at witness_checkorder+0x122c sys/kern/subr_witness.c:854
rw_do_enter_read(ffff80000159d860,0) at rw_do_enter_read+0x99 sys/kern/kern_rwlock.c:355
in6_hasmulti(fffffd806c8a65f0,ffff80000159d800) at in6_hasmulti+0x41 in6_lookupmulti sys/netinet6/in6.c:-1 [inline]
in6_hasmulti(fffffd806c8a65f0,ffff80000159d800) at in6_hasmulti+0x41 sys/netinet6/in6.c:1150
ip6_output(fffffd806c8a6500,ffffffff83987338,0,0,ffff80002a1fde60,0) at ip6_output+0x13bd sys/netinet6/ip6_output.c:507
mld6_sendpkt(ffff800001544900,83,0) at mld6_sendpkt+0x385 sys/netinet6/mld6.c:499
mld6_fasttimo() at mld6_fasttimo+0x16d mld6_checktimer sys/netinet6/mld6.c:395 [inline]
mld6_fasttimo() at mld6_fasttimo+0x16d sys/netinet6/mld6.c:369
pffasttimo(ffffffff83a152a8) at pffasttimo+0x184 sys/kern/uipc_domain.c:-1
timeout_run(ffffffff8383b068,ffffffff83a152a8) at timeout_run+0x159 sys/kern/kern_timeout.c:698
softclock_thread_run(ffffffff8383b068) at softclock_thread_run+0xe7 sys/kern/kern_timeout.c:842
softclock_thread_mp(ffff8000fffff228) at softclock_thread_mp+0x86
end trace frame: 0x0, count: 3
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
*cpu1: excl->share
ddb{1}> trace
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff833b5a1c) at panic+0x1e5 sys/kern/subr_prf.c:198
witness_checkorder(ffff80000159d878,1,0) at witness_checkorder+0x122c sys/kern/subr_witness.c:854
rw_do_enter_read(ffff80000159d860,0) at rw_do_enter_read+0x99 sys/kern/kern_rwlock.c:355
in6_hasmulti(fffffd806c8a65f0,ffff80000159d800) at in6_hasmulti+0x41 in6_lookupmulti sys/netinet6/in6.c:-1 [inline]
in6_hasmulti(fffffd806c8a65f0,ffff80000159d800) at in6_hasmulti+0x41 sys/netinet6/in6.c:1150
ip6_output(fffffd806c8a6500,ffffffff83987338,0,0,ffff80002a1fde60,0) at ip6_output+0x13bd sys/netinet6/ip6_output.c:507
mld6_sendpkt(ffff800001544900,83,0) at mld6_sendpkt+0x385 sys/netinet6/mld6.c:499
mld6_fasttimo() at mld6_fasttimo+0x16d mld6_checktimer sys/netinet6/mld6.c:395 [inline]
mld6_fasttimo() at mld6_fasttimo+0x16d sys/netinet6/mld6.c:369
pffasttimo(ffffffff83a152a8) at pffasttimo+0x184 sys/kern/uipc_domain.c:-1
timeout_run(ffffffff8383b068,ffffffff83a152a8) at timeout_run+0x159 sys/kern/kern_timeout.c:698
softclock_thread_run(ffffffff8383b068) at softclock_thread_run+0xe7 sys/kern/kern_timeout.c:842
softclock_thread_mp(ffff8000fffff228) at softclock_thread_mp+0x86
end trace frame: 0x0, count: -12
ddb{1}> show registers
rdi 0
rsi 0x1
rbp 0xffff80002a1fdab0
rbx 0xffff8000299dee07
rdx 0
rcx 0xffff8000fffff228
rax 0xffff8000299ddff0
r8 0x101010101010101
r9 0x8080808080808080
r10 0x714bbca09060ddb7
r11 0x7eb5d9844cac5137
r12 0xffff8000299dec08
r13 0
r14 0
r15 0x1
rip 0xffffffff817c1d35 db_enter+0x25
cs 0x8
rflags 0x246
rsp 0xffff80002a1fdaa0
ss 0x10
db_enter+0x25: addq $0x8,%rsp
ddb{1}> show proc
PROC (softclockmp) tid=216979 pid=44066 tcnt=1 stat=onproc
flags process=14000<NOZOMBIE,SYSTEM> proc=200<SYSTEM>
runpri=0, usrpri=50, slppri=0, nice=20
wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0
forw=0xffffffffffffffff, list=0xffff8000fffff4c0,0xffff8000ffffefa0
process=0xffff8000ffff9ce0 user=0xffff80002a1f9000, vmspace=0xffffffff838bee00
estcpu=0, cpticks=1, pctcpu=0.0, user=0, sys=0, intr=0
ddb{1}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
74319 113507 12589 0 7 0 syz-executor
74319 431682 12589 0 2 0x4000000 syz-executor
88264 523968 48705 0 2 0 syz-executor
88264 235594 48705 0 3 0x4000080 fsleep syz-executor
88264 351013 48705 0 3 0x4000080 fsleep syz-executor
88264 454173 48705 0 3 0x4000080 fsleep syz-executor
71173 320187 80375 0 2 0x2 syz-executor
26841 434496 26303 -1 2 0xc90 syz-executor
26841 211954 26303 -1 3 0x4000090 fsleep syz-executor
26841 316325 26303 -1 3 0x4000090 kqsel syz-executor
26841 191509 26303 -1 3 0x4000090 fsleep syz-executor
2597 483921 90008 0 2 0 syz-executor
2597 449356 90008 0 2 0x4000000 syz-executor
2597 329250 90008 0 2 0x4000000 syz-executor
2597 376323 90008 0 3 0x4000080 fsleep syz-executor
21523 175597 40448 0 2 0 syz-executor
21523 10280 40448 0 3 0x4000080 fsleep syz-executor
49033 197917 74906 0 2 0xc80 syz-executor
49033 477275 74906 0 2 0x4000000 syz-executor
49033 329123 74906 0 3 0x4000080 fsleep syz-executor
41825 522823 0 0 3 0x14280 nfsidl nfsio
10796 329838 0 0 3 0x14280 nfsidl nfsio
5187 88301 0 0 3 0x14280 nfsidl nfsio
81934 34660 0 0 3 0x14280 nfsidl nfsio
57368 238704 0 0 3 0x14280 nfsidl nfsio
34599 303354 0 0 3 0x14280 nfsidl nfsio
87114 115372 0 0 3 0x14280 nfsidl nfsio
47802 346335 0 0 3 0x14280 nfsidl nfsio
81551 306486 0 0 3 0x14280 nfsidl nfsio
52649 241194 0 0 3 0x14280 nfsidl nfsio
74186 495796 0 0 3 0x14280 nfsidl nfsio
58912 310979 0 0 3 0x14280 nfsidl nfsio
73407 171574 0 0 3 0x14280 nfsidl nfsio
51073 476933 0 0 3 0x14280 nfsidl nfsio
96192 366420 0 0 3 0x14280 nfsidl nfsio
67300 167365 0 0 3 0x14280 nfsidl nfsio
66967 25830 0 0 3 0x14280 nfsidl nfsio
43323 289836 0 0 3 0x14280 nfsidl nfsio
18226 224490 0 0 3 0x14280 nfsidl nfsio
43076 455214 0 0 3 0x14280 nfsidl nfsio
48705 45454 80375 0 3 0x82 nanoslp syz-executor
12589 440609 80375 0 2 0xc82 syz-executor
74906 49062 80375 0 2 0xc82 syz-executor
5517 339540 80375 0 3 0x82 nanoslp syz-executor
26303 343996 80375 0 3 0x82 nanoslp syz-executor
40448 261588 80375 0 2 0xc82 syz-executor
90008 322375 80375 0 3 0x82 nanoslp syz-executor
80375 65100 36960 0 3 0x82 kqread syz-executor
36960 34869 19207 0 3 0x10008a sigsusp ksh
19207 38226 70190 0 3 0x98 kqread sshd-session
70190 468986 55488 0 3 0x92 kqread sshd-session
52334 261563 1 0 3 0x100083 ttyopn getty
55488 157318 1 0 3 0x88 kqread sshd
8592 86621 89027 74 3 0x1100092 bpf pflogd
89027 390715 1 0 3 0x80 sbwait pflogd
30745 236783 36013 73 3 0x1100090 kqread syslogd
36013 119647 1 0 3 0x100082 sbwait syslogd
12849 201380 1 0 3 0x100080 kqread resolvd
34960 54996 65203 77 3 0x100092 kqread dhcpleased
11487 229380 65203 77 3 0x100092 kqread dhcpleased
65203 82018 1 0 3 0x80 kqread dhcpleased
87006 231446 0 0 3 0x14200 bored smr
74423 127992 0 0 2 0x14200 zerothread
54966 228089 0 0 3 0x14200 aiodoned aiodoned
21166 109415 0 0 3 0x14200 syncer update
32391 100340 0 0 3 0x14200 cleaner cleaner
17699 489195 0 0 3 0x14200 reaper reaper
25933 320039 0 0 3 0x14200 pgdaemon pagedaemon
95969 158396 0 0 3 0x14200 bored viomb
52701 365363 0 0 3 0x40014200 acpi0 acpi0
57279 523093 0 0 3 0x40014200 idle1
48604 283463 0 0 3 0x14200 bored softnet1
32588 331574 0 0 3 0x14200 bored softnet0
43824 262652 0 0 3 0x14200 smrbar systqmp
61702 445877 0 0 3 0x14200 bored systq
*44066 216979 0 0 7 0x14200 softclockmp
68834 40751 0 0 3 0x40014200 tmoslp softclock
50049 208414 0 0 3 0x40014200 idle0
1 338342 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{1}> show all locks
Process 49033 (syz-executor) thread 0xffff80003c4cefc8 (477275)
exclusive rrwlock inode r = 0 (0xfffffd8068d77d98)
#0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320
#2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621
#3 VOP_LOCK+0xbd sys/kern/vfs_vops.c:527
#4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570
#5 vn_write+0x18f sys/kern/vfs_vnops.c:405
#6 dofilewritev+0x242 sys/kern/sys_generic.c:380
#7 sys_write+0xa2 sys/kern/sys_generic.c:300
#8 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#8 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775
#9 Xsyscall+0x128
Process 43824 (systqmp) thread 0xffff8000ffffe530 (262652)
shared rwlock systqmp r = 0 (0xffffffff837bcb68)
#0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1 taskq_thread+0x12a sys/kern/kern_task.c:442
#2 proc_trampoline+0x10
Process 44066 (softclockmp) thread 0xffff8000fffff228 (216979)
exclusive rwlock maddr r = 0 (0xffff80000159d878)
#0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320
#2 mld6_fasttimo+0x8c mld6_checktimer sys/netinet6/mld6.c:-1 [inline]
#2 mld6_fasttimo+0x8c sys/netinet6/mld6.c:369
#3 pffasttimo+0x184 sys/kern/uipc_domain.c:-1
#4 timeout_run+0x159 sys/kern/kern_timeout.c:698
#5 softclock_thread_run+0xe7 sys/kern/kern_timeout.c:842
#6 softclock_thread_mp+0x86
#7 proc_trampoline+0x10
shared rwlock netlock r = 0 (0xffffffff83832e50)
#0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1 rw_do_enter_read+0x3e8 sys/kern/kern_rwlock.c:413
#2 mld6_fasttimo+0x5f sys/netinet6/mld6.c:-1
#3 pffasttimo+0x184 sys/kern/uipc_domain.c:-1
#4 timeout_run+0x159 sys/kern/kern_timeout.c:698
#5 softclock_thread_run+0xe7 sys/kern/kern_timeout.c:842
#6 softclock_thread_mp+0x86
#7 proc_trampoline+0x10
shared rwlock timeout r = 0 (0xffffffff8383b008)
#0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1 timeout_run+0x131 sys/kern/kern_timeout.c:694
#2 softclock_thread_run+0xe7 sys/kern/kern_timeout.c:842
#3 softclock_thread_mp+0x86
#4 proc_trampoline+0x10
ddb{1}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 11072 12105K 12515K 166960K 13129 0
pcb 18 14K 16K 166960K 175 0
rtable 179 9K 9K 166960K 533 0
pf 30 16K 18K 166960K 90 0
ifaddr 31 5K 7K 166960K 74 0
ifgroup 47 2K 2K 166960K 109 0
sysctl 3 1K 9K 166960K 9 0
counters 66 36K 37K 166960K 130 0
ioctlops 0 0K 4K 166960K 1539 0
iov 0 0K 12K 166960K 27 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1397 88K 89K 166960K 1953 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 12 0K 0K 166960K 82 0
dirhash 12 2K 2K 166960K 18 0
ACPI 1692 195K 286K 166960K 12470 0
file desc 17 61K 236K 166960K 630 0
sigio 0 0K 0K 166960K 79 0
proc 72 115K 212K 166960K 600 0
subproc 72 4K 4K 166960K 90 0
NFS srvsock 1 0K 0K 166960K 1 0
NFS daemon 1 16K 16K 166960K 1 0
ip_moptions 0 0K 0K 166960K 79 0
in_multi 63 4K 7K 166960K 121 0
ether_multi 2 0K 0K 166960K 7 0
mrt 1 0K 0K 166960K 8 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 527 0
fusefs mount 1 32K 32K 166960K 1 0
pfkey data 0 0K 0K 166960K 2 0
tdb 3 0K 0K 166960K 3 0
VM swap 8 62K 64K 166960K 10 0
UVM amap 258 159K 173K 166960K 7608 0
UVM aobj 22 4K 4K 166960K 23 0
pinsyscall 42 84K 104K 166960K 1825 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
ip6_options 1 0K 0K 166960K 27 0
NDP 10 0K 2K 166960K 50 0
temp 61 8675K 8741K 166960K 33488 0
kqueue 14 22K 28K 166960K 115 0
SYN cache 2 16K 16K 166960K 2 0
ddb{1}> 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 66 0 62 1 0 1 1 0 8 0
rtentry 176 128 0 61 6 0 6 6 0 8 0
unpcb 144 397 0 380 7 3 4 4 0 8 3
syncache 336 6 0 6 3 2 1 1 0 8 1
tcpcb 736 139 0 133 2 0 2 2 0 8 0
arp 136 20 0 8 1 0 1 1 0 8 0
inpcb 328 597 0 584 9 6 3 7 0 8 1
nd6 152 27 0 12 1 0 1 1 0 8 0
pkpcb 40 4 0 4 2 1 1 1 0 8 1
kcovpl 48 9 0 2 1 0 1 1 0 8 0
ppxss 1192 24 0 24 1 0 1 1 0 8 1
pppxif 1576 1 0 1 1 0 1 1 0 8 1
pffrag 232 1 0 0 1 0 1 1 0 482 0
pffrnode 88 1 0 0 1 0 1 1 0 8 0
pffrent 40 1 0 0 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
pfstitem 24 63 0 3 1 0 1 1 0 8 0
pfstkey 128 63 0 3 2 0 2 2 0 8 0
pfstate 448 63 0 3 7 0 7 7 0 8 0
pfrule 1344 21 0 15 2 0 2 2 0 8 0
rttmr 136 2 0 2 1 1 0 1 0 8 0
art_heap8 4096 3 0 1 3 0 3 3 0 8 1
art_heap4 256 542 0 254 29 4 25 29 0 8 1
art_table 40 545 0 255 5 0 5 5 0 8 0
art_node 32 128 0 67 1 0 1 1 0 8 0
sysvmsgpl 40 9 0 7 1 0 1 1 0 8 0
semapl 112 80 0 70 1 0 1 1 0 8 0
shmpl 112 20 0 1 1 0 1 1 0 8 0
dirhash 1024 21 0 4 3 0 3 3 0 8 0
dino2pl 256 2472 0 962 95 0 95 95 0 8 0
ffsino 296 2472 0 962 117 0 117 117 0 8 0
nchpl 144 3301 0 1596 64 0 64 64 0 8 0
rtmask 32 8 0 8 3 2 1 1 0 8 1
vnodes 216 2965 0 0 165 0 165 165 0 8 0
namei 1024 10788 0 10788 1 0 1 1 0 8 1
percpumem 16 80 0 32 1 0 1 1 0 8 0
kstatmem 264 68 0 44 3 0 3 3 0 8 1
scsiplug 72 5 0 5 1 1 0 1 0 8 0
scxspl 216 12243 0 12243 11 10 1 8 1 8 1
plimitpl 152 159 0 141 1 0 1 1 0 8 0
sigapl 424 957 0 890 9 1 8 8 0 8 0
knotepl 120 550 0 0 17 0 17 17 0 8 0
kqueuepl 224 280 0 269 8 3 5 5 0 8 4
pipepl 344 172 0 145 3 0 3 3 0 8 0
fdescpl 528 921 0 890 3 0 3 3 0 8 0
filepl 160 5031 0 4805 18 3 15 15 0 8 4
lockfpl 104 148 0 145 1 0 1 1 0 8 0
lockfspl 48 69 0 66 1 0 1 1 0 8 0
sessionpl 144 26 0 17 1 0 1 1 0 8 0
pgrppl 48 44 0 27 1 0 1 1 0 8 0
ucredpl 104 732 0 717 1 0 1 1 0 8 0
zombiepl 144 891 0 890 1 0 1 1 0 8 0
processpl 1232 957 0 890 7 1 6 6 0 8 0
procpl 664 1788 0 1708 8 0 8 8 0 8 0
sosppl 176 2 0 2 1 1 0 1 0 8 0
sockpl 752 1082 0 1048 17 6 11 11 0 8 7
mcl64k 65536 17 0 0 3 0 3 3 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
mcl9k 9216 2 0 0 1 0 1 1 0 8 0
mcl8k 8192 5 0 0 1 0 1 1 0 8 0
mcl4k 4096 116 0 0 15 0 15 15 0 8 0
mcl2k 2048 57 0 0 8 0 8 8 0 8 0
mtagpl 96 13 0 0 1 0 1 1 0 8 0
mbufpl 256 1174 0 0 74 0 74 74 0 8 0
bufpl 280 4265 0 140 295 0 295 295 0 8 0
anonpl 32 8404 0 0 68 0 68 68 0 246 0
amapchunkpl 152 24811 0 24232 44 14 30 35 0 158 7
amappl16 200 2949 0 2915 18 14 4 14 0 8 1
amappl15 192 31 0 31 1 1 0 1 0 8 0
amappl14 184 5 0 5 1 1 0 1 0 8 0
amappl13 176 450 0 449 1 0 1 1 0 8 0
amappl12 168 1306 0 1264 3 0 3 3 0 8 0
amappl11 160 4 0 4 1 1 0 1 0 8 0
amappl10 152 56 0 42 1 0 1 1 0 8 0
amappl9 144 249 0 249 1 1 0 1 0 8 0
amappl8 136 25 0 23 1 0 1 1 0 8 0
amappl7 128 92 0 91 1 0 1 1 0 8 0
amappl6 120 297 0 284 1 0 1 1 0 8 0
amappl5 112 74 0 64 1 0 1 1 0 8 0
amappl4 104 451 0 421 1 0 1 1 0 8 0
amappl3 96 4156 0 4058 4 1 3 3 0 8 0
amappl2 88 1056 0 981 2 0 2 2 0 8 0
amappl1 80 12230 0 11644 14 0 14 14 0 8 0
amappl 88 6741 0 6561 5 0 5 5 0 92 0
uvmvnodes 80 113 0 0 3 0 3 3 0 8 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 128 254 0 254 2 2 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 19 0 18 1 0 1 1 0 8 0
aobjpl 72 22 0 1 1 0 1 1 0 8 0
uaddrrnd 24 921 0 890 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 921 0 890 1 0 1 1 0 8 0
vmmpekpl 168 9521 0 9475 3 0 3 3 0 8 0
vmmpepl 168 65793 0 63862 97 5 92 95 0 357 4
vmsppl 488 920 0 890 5 0 5 5 0 8 0
rwobjpl 80 20712 0 19642 26 2 24 26 0 8 0
pdppl 4096 1849 0 1780 117 44 73 87 0 8 4
pvpl 32 14369 0 0 117 1 116 116 0 265 0
pmappl 256 920 0 890 3 0 3 3 0 8 0
extentpl 40 45 0 27 1 0 1 1 0 8 0
phpool 112 368 0 52 10 0 10 10 0 8 0
ddb{1}> machine ddbcpu 0
Stopped at x86_ipi_db+0x27: addq $0x8,%rsp
x86_ipi_db(ffffffff83878ff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394
x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27
end of kernel
end trace frame: 0x7dabd3172580, count: 12
ddb{0}> trace
x86_ipi_db(ffffffff83878ff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394
x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27
end of kernel
end trace frame: 0x7dabd3172580, count: -3
ddb{0}> machine ddbcpu 1
Stopped at db_enter+0x25: addq $0x8,%rsp
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff833b5a1c) at panic+0x1e5 sys/kern/subr_prf.c:198
witness_checkorder(ffff80000159d878,1,0) at witness_checkorder+0x122c sys/kern/subr_witness.c:854
rw_do_enter_read(ffff80000159d860,0) at rw_do_enter_read+0x99 sys/kern/kern_rwlock.c:355
in6_hasmulti(fffffd806c8a65f0,ffff80000159d800) at in6_hasmulti+0x41 in6_lookupmulti sys/netinet6/in6.c:-1 [inline]
in6_hasmulti(fffffd806c8a65f0,ffff80000159d800) at in6_hasmulti+0x41 sys/netinet6/in6.c:1150
ip6_output(fffffd806c8a6500,ffffffff83987338,0,0,ffff80002a1fde60,0) at ip6_output+0x13bd sys/netinet6/ip6_output.c:507
mld6_sendpkt(ffff800001544900,83,0) at mld6_sendpkt+0x385 sys/netinet6/mld6.c:499
mld6_fasttimo() at mld6_fasttimo+0x16d mld6_checktimer sys/netinet6/mld6.c:395 [inline]
mld6_fasttimo() at mld6_fasttimo+0x16d sys/netinet6/mld6.c:369
pffasttimo(ffffffff83a152a8) at pffasttimo+0x184 sys/kern/uipc_domain.c:-1
timeout_run(ffffffff8383b068,ffffffff83a152a8) at timeout_run+0x159 sys/kern/kern_timeout.c:698
softclock_thread_run(ffffffff8383b068) at softclock_thread_run+0xe7 sys/kern/kern_timeout.c:842
softclock_thread_mp(ffff8000fffff228) at softclock_thread_mp+0x86
end trace frame: 0x0, count: 3
ddb{1}> trace
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff833b5a1c) at panic+0x1e5 sys/kern/subr_prf.c:198
witness_checkorder(ffff80000159d878,1,0) at witness_checkorder+0x122c sys/kern/subr_witness.c:854
rw_do_enter_read(ffff80000159d860,0) at rw_do_enter_read+0x99 sys/kern/kern_rwlock.c:355
in6_hasmulti(fffffd806c8a65f0,ffff80000159d800) at in6_hasmulti+0x41 in6_lookupmulti sys/netinet6/in6.c:-1 [inline]
in6_hasmulti(fffffd806c8a65f0,ffff80000159d800) at in6_hasmulti+0x41 sys/netinet6/in6.c:1150
ip6_output(fffffd806c8a6500,ffffffff83987338,0,0,ffff80002a1fde60,0) at ip6_output+0x13bd sys/netinet6/ip6_output.c:507
mld6_sendpkt(ffff800001544900,83,0) at mld6_sendpkt+0x385 sys/netinet6/mld6.c:499
mld6_fasttimo() at mld6_fasttimo+0x16d mld6_checktimer sys/netinet6/mld6.c:395 [inline]
mld6_fasttimo() at mld6_fasttimo+0x16d sys/netinet6/mld6.c:369
pffasttimo(ffffffff83a152a8) at pffasttimo+0x184 sys/kern/uipc_domain.c:-1
timeout_run(ffffffff8383b068,ffffffff83a152a8) at timeout_run+0x159 sys/kern/kern_timeout.c:698
softclock_thread_run(ffffffff8383b068) at softclock_thread_run+0xe7 sys/kern/kern_timeout.c:842
softclock_thread_mp(ffff8000fffff228) at softclock_thread_mp+0x86
end trace frame: 0x0, count: -12