panic: excl->share Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 448387 51318 0 0x14000 0x200 0 reaper *361801 9091 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(ffff800001598878,1,0) at witness_checkorder+0x122c sys/kern/subr_witness.c:854 rw_do_enter_read(ffff800001598860,0) at rw_do_enter_read+0x99 sys/kern/kern_rwlock.c:355 in6_hasmulti(fffffd80764690f0,ffff800001598800) at in6_hasmulti+0x41 in6_lookupmulti sys/netinet6/in6.c:-1 [inline] in6_hasmulti(fffffd80764690f0,ffff800001598800) at in6_hasmulti+0x41 sys/netinet6/in6.c:1150 ip6_output(fffffd8076469000,ffffffff83987338,0,0,ffff80002a1fe840,0) at ip6_output+0x13bd sys/netinet6/ip6_output.c:507 mld6_sendpkt(ffff8000015a9580,83,0) 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(ffff8000ffffe298) 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(ffff800001598878,1,0) at witness_checkorder+0x122c sys/kern/subr_witness.c:854 rw_do_enter_read(ffff800001598860,0) at rw_do_enter_read+0x99 sys/kern/kern_rwlock.c:355 in6_hasmulti(fffffd80764690f0,ffff800001598800) at in6_hasmulti+0x41 in6_lookupmulti sys/netinet6/in6.c:-1 [inline] in6_hasmulti(fffffd80764690f0,ffff800001598800) at in6_hasmulti+0x41 sys/netinet6/in6.c:1150 ip6_output(fffffd8076469000,ffffffff83987338,0,0,ffff80002a1fe840,0) at ip6_output+0x13bd sys/netinet6/ip6_output.c:507 mld6_sendpkt(ffff8000015a9580,83,0) 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(ffff8000ffffe298) at softclock_thread_mp+0x86 end trace frame: 0x0, count: -12 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff80002a1fe490 rbx 0xffff8000299dee07 rdx 0 rcx 0xffff8000ffffe298 rax 0xffff8000299ddff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0xefea1618a9606c49 r11 0xbb9cb982aaadc1a1 r12 0xffff8000299dec08 r13 0 r14 0 r15 0x1 rip 0xffffffff817c1d35 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80002a1fe480 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (softclockmp) tid=361801 pid=9091 tcnt=1 stat=onproc flags process=14000 proc=200 runpri=0, usrpri=50, slppri=0, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000ffffea60,0xffff8000ffffe010 process=0xffff8000ffffa1b0 user=0xffff80002a1f9000, vmspace=0xffffffff838bee00 estcpu=0, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 7491 257343 53163 0 2 0 syz-executor 7491 178311 53163 0 3 0x4000000 netlock syz-executor 7491 204782 53163 0 3 0x4000080 fsleep syz-executor 83496 224784 43988 0 2 0 syz-executor 83496 317535 43988 0 2 0x4000080 syz-executor 83496 438054 43988 0 3 0x4000080 fsleep syz-executor 65702 87699 55976 0 2 0 syz-executor 65702 289283 55976 0 3 0x4000080 fsleep syz-executor 65702 102794 55976 0 3 0x4000080 fsleep syz-executor 71544 371731 1941 0 2 0xc80 syz-executor 71544 67871 1941 0 3 0x4000080 sbwait syz-executor 71544 214840 1941 0 3 0x4000080 fsleep syz-executor 71544 43314 1941 0 3 0x4000080 fsleep syz-executor 82324 51188 20336 60929 2 0xc90 syz-executor 82324 11765 20336 60929 3 0x4000090 msgwait syz-executor 82324 63993 20336 60929 3 0x4000090 fsleep syz-executor 1941 294357 64236 0 3 0x82 nanoslp syz-executor 2496 34769 19741 0 3 0x3000 suspend syz-executor 2496 135580 19741 0 2 0x4081000 syz-executor 2496 337603 19741 0 3 0x4081000 inode syz-executor 68337 490988 1 0 3 0x80 nanoslp init 20336 474272 64236 0 2 0x2 syz-executor 53806 136021 64236 0 3 0x82 wait syz-executor 43988 299755 64236 0 2 0x2 syz-executor 53163 487487 64236 0 3 0x82 nanoslp syz-executor 37751 464493 64236 0 2 0xc82 syz-executor 55976 57073 64236 0 3 0x82 nanoslp syz-executor 19741 31912 64236 0 2 0xc82 syz-executor 64236 347213 54885 0 3 0x82 kqread syz-executor 54885 316818 64383 0 3 0x10008a sigsusp ksh 64383 514056 14938 0 3 0x98 kqread sshd-session 14938 349811 87717 0 3 0x92 kqread sshd-session 87717 86683 1 0 3 0x88 kqread sshd 28453 125854 25152 74 3 0x1100092 bpf pflogd 25152 155623 1 0 3 0x80 sbwait pflogd 14943 523252 25026 73 3 0x1100090 kqread syslogd 25026 313792 1 0 3 0x100082 sbwait syslogd 35607 355194 1 0 3 0x100080 kqread resolvd 66979 357862 43286 77 3 0x100092 kqread dhcpleased 19264 117338 43286 77 3 0x100092 kqread dhcpleased 43286 480960 1 0 3 0x80 kqread dhcpleased 12077 261705 0 0 2 0x40014200 smr 17844 510362 0 0 3 0x14200 pgzero zerothread 16394 28944 0 0 3 0x14200 aiodoned aiodoned 21002 321279 0 0 3 0x14200 syncer update 38874 142664 0 0 3 0x14200 cleaner cleaner 51318 448387 0 0 7 0x14200 reaper 44309 261396 0 0 3 0x14200 pgdaemon pagedaemon 56692 263343 0 0 3 0x14200 bored viomb 48359 259964 0 0 3 0x40014200 acpi0 acpi0 78971 458419 0 0 3 0x40014200 idle1 64739 226788 0 0 3 0x14200 bored softnet1 35538 501074 0 0 3 0x14200 bored softnet0 24221 342361 0 0 3 0x14200 bored systqmp 79807 400879 0 0 3 0x14200 bored systq * 9091 361801 0 0 7 0x14200 softclockmp 49134 437431 0 0 3 0x40014200 tmoslp softclock 84584 443773 0 0 3 0x40014200 idle0 1 520768 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 2496 (syz-executor) thread 0xffff80003c3fc020 (135580) exclusive rrwlock inode r = 0 (0xfffffd806fa56a08) #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 2496 (syz-executor) thread 0xffff80003c3fc7e8 (337603) exclusive rrwlock inode r = 0 (0xfffffd806f1106d8) #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 vfs_lookup+0x11c sys/kern/vfs_lookup.c:-1 #6 namei+0x7ca sys/kern/vfs_lookup.c:250 #7 dorenameat+0x91 sys/kern/vfs_syscalls.c:2990 #8 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 #9 Xsyscall+0x128 Process 9091 (softclockmp) thread 0xffff8000ffffe298 (361801) exclusive rwlock maddr r = 0 (0xffff800001598878) #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 11058 12086K 12486K 166960K 12468 0 pcb 18 12K 12K 166960K 75 0 rtable 236 9K 10K 166960K 429 0 pf 32 17K 81K 166960K 85 0 ifaddr 40 7K 8K 166960K 70 0 ifgroup 51 2K 2K 166960K 95 0 sysctl 3 1K 9K 166960K 7 0 counters 68 36K 38K 166960K 124 0 ioctlops 0 0K 4K 166960K 1527 0 iov 0 0K 4K 166960K 4 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1337 84K 85K 166960K 1558 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 3 0 VM map 2 1K 1K 166960K 2 0 sem 11 0K 0K 166960K 14 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 106K 166960K 396 0 sigio 0 0K 0K 166960K 4 0 proc 63 99K 163K 166960K 577 0 subproc 72 4K 4K 166960K 81 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 61 0 in_multi 92 6K 7K 166960K 138 0 ether_multi 1 0K 0K 166960K 8 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 79 360K 360K 166960K 79 0 exec 0 0K 1K 166960K 403 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 253 156K 169K 166960K 5335 0 UVM aobj 12 8K 8K 166960K 13 0 pinsyscall 41 82K 108K 166960K 1557 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 1K 166960K 19 0 NDP 13 0K 2K 166960K 48 0 temp 46 8672K 8736K 166960K 9639 0 kqueue 15 24K 36K 166960K 80 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 50 0 47 1 0 1 1 0 8 0 rtentry 176 129 0 28 6 0 6 6 0 8 0 unpcb 144 132 0 113 2 0 2 2 0 8 1 syncache 336 8 0 8 1 0 1 1 0 8 1 tcpqe 32 2 0 2 1 0 1 1 0 8 1 tcpcb 736 101 0 91 4 0 4 4 0 8 3 arp 136 22 0 5 1 0 1 1 0 8 0 inpcb 328 390 0 375 7 1 6 7 0 8 4 nd6 152 27 0 6 1 0 1 1 0 8 0 kcovpl 48 9 0 1 1 0 1 1 0 8 0 ppxss 1192 24 0 24 1 0 1 1 0 8 1 pppxif 1576 2 0 2 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 29 0 0 1 0 1 1 0 8 0 pfstkey 128 29 0 0 1 0 1 1 0 8 0 pfstate 448 29 0 0 4 0 4 4 0 8 0 pfrule 1344 22 0 18 2 1 1 2 0 8 0 art_heap8 4096 3 0 0 3 0 3 3 0 8 0 art_heap4 256 513 0 102 29 0 29 29 0 8 1 art_table 40 516 0 102 5 0 5 5 0 8 0 art_node 32 129 0 37 1 0 1 1 0 8 0 semapl 112 11 0 2 1 0 1 1 0 8 0 shmpl 112 8 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 2007 0 496 95 0 95 95 0 8 0 ffsino 296 2007 0 496 117 0 117 117 0 8 0 nchpl 144 2541 0 834 64 0 64 64 0 8 0 rtmask 32 5 0 5 1 0 1 1 0 8 1 vnodes 216 2191 0 0 122 0 122 122 0 8 0 namei 1024 7875 0 7874 1 0 1 1 0 8 0 percpumem 16 77 0 28 1 0 1 1 0 8 0 vcpupl 3968 2 0 1 1 0 1 1 0 8 0 vmpool 848 2 0 1 1 0 1 1 0 8 0 kstatmem 264 58 0 34 3 0 3 3 0 8 1 scsiplug 72 1 0 1 1 0 1 1 0 8 1 scxspl 216 12600 0 12600 9 1 8 8 1 8 8 plimitpl 152 153 0 136 1 0 1 1 0 8 0 sigapl 424 700 0 652 7 0 7 7 0 8 1 knotepl 120 314 0 0 10 0 10 10 0 8 0 kqueuepl 224 123 0 110 2 0 2 2 0 8 1 pipepl 344 168 0 141 6 1 5 6 0 8 2 fdescpl 528 684 0 653 3 0 3 3 0 8 0 filepl 160 3006 0 2778 12 0 12 12 0 8 1 lockfpl 104 69 0 64 1 0 1 1 0 8 0 lockfspl 48 34 0 30 1 0 1 1 0 8 0 sessionpl 144 26 0 18 1 0 1 1 0 8 0 pgrppl 48 41 0 25 1 0 1 1 0 8 0 ucredpl 104 307 0 293 1 0 1 1 0 8 0 zombiepl 144 655 0 652 1 0 1 1 0 8 0 processpl 1232 700 0 652 5 0 5 5 0 8 1 procpl 664 1110 0 1049 6 0 6 6 0 8 0 sosppl 176 2 0 2 1 0 1 1 0 8 1 sockpl 752 581 0 544 11 1 10 11 0 8 6 mcl64k 65536 8 0 0 1 0 1 1 0 8 0 mcl16k 16384 11 0 0 2 0 2 2 0 8 0 mcl12k 12288 2 0 0 1 0 1 1 0 8 0 mcl9k 9216 3 0 0 1 0 1 1 0 8 0 mcl8k 8192 4 0 0 1 0 1 1 0 8 0 mcl4k 4096 124 0 0 16 0 16 16 0 8 0 mcl2k2 2112 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 24 0 0 3 0 3 3 0 8 0 mtagpl 96 5 0 0 1 0 1 1 0 8 0 mbufpl 256 178 0 0 12 0 12 12 0 8 0 bufpl 280 4968 0 131 346 0 346 346 0 8 0 anonpl 32 10529 0 0 85 0 85 85 0 246 0 amapchunkpl 152 16683 0 16006 29 0 29 29 0 158 1 amappl16 200 2995 0 2742 23 6 17 17 0 8 3 amappl15 192 16 0 16 1 1 0 1 0 8 0 amappl14 184 5 0 5 1 1 0 1 0 8 0 amappl13 176 438 0 437 1 0 1 1 0 8 0 amappl12 168 1054 0 1014 3 0 3 3 0 8 0 amappl11 160 35 0 34 1 0 1 1 0 8 0 amappl10 152 78 0 64 1 0 1 1 0 8 0 amappl9 144 251 0 251 1 1 0 1 0 8 0 amappl8 136 45 0 43 1 0 1 1 0 8 0 amappl7 128 114 0 113 1 0 1 1 0 8 0 amappl6 120 289 0 276 1 0 1 1 0 8 0 amappl5 112 142 0 132 1 0 1 1 0 8 0 amappl4 104 451 0 422 1 0 1 1 0 8 0 amappl3 96 2712 0 2615 4 1 3 3 0 8 0 amappl2 88 807 0 735 2 0 2 2 0 8 0 amappl1 80 10710 0 10139 15 1 14 15 0 8 0 amappl 88 4541 0 4361 5 0 5 5 0 92 0 uvmvnodes 80 107 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 1 1 1 0 8 1 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 12 0 1 1 0 1 1 0 8 0 uaddrrnd 24 684 0 653 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 684 0 653 1 0 1 1 0 8 0 vmmpekpl 168 7567 0 7523 3 0 3 3 0 8 0 vmmpepl 168 52026 0 49909 98 0 98 98 0 357 0 vmsppl 488 683 0 653 5 0 5 5 0 8 0 rwobjpl 80 17704 0 16455 27 0 27 27 0 8 0 pdppl 4096 1379 0 1309 98 24 74 85 0 8 4 pvpl 32 18998 0 0 154 0 154 154 0 265 0 pmappl 256 685 0 654 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 279 0 26 8 0 8 8 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 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x38 sys/dev/kcov.c:-1 __mp_lock(ffffffff83970900) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83970900) at __mp_lock+0x1a3 sys/kern/kern_lock.c:173 reaper(ffff8000ffffd9f8) at reaper+0x211 sys/kern/kern_exit.c:505 end trace frame: 0x0, count: 9 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 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x38 sys/dev/kcov.c:-1 __mp_lock(ffffffff83970900) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83970900) at __mp_lock+0x1a3 sys/kern/kern_lock.c:173 reaper(ffff8000ffffd9f8) at reaper+0x211 sys/kern/kern_exit.c:505 end trace frame: 0x0, count: -6 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(ffff800001598878,1,0) at witness_checkorder+0x122c sys/kern/subr_witness.c:854 rw_do_enter_read(ffff800001598860,0) at rw_do_enter_read+0x99 sys/kern/kern_rwlock.c:355 in6_hasmulti(fffffd80764690f0,ffff800001598800) at in6_hasmulti+0x41 in6_lookupmulti sys/netinet6/in6.c:-1 [inline] in6_hasmulti(fffffd80764690f0,ffff800001598800) at in6_hasmulti+0x41 sys/netinet6/in6.c:1150 ip6_output(fffffd8076469000,ffffffff83987338,0,0,ffff80002a1fe840,0) at ip6_output+0x13bd sys/netinet6/ip6_output.c:507 mld6_sendpkt(ffff8000015a9580,83,0) 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(ffff8000ffffe298) 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(ffff800001598878,1,0) at witness_checkorder+0x122c sys/kern/subr_witness.c:854 rw_do_enter_read(ffff800001598860,0) at rw_do_enter_read+0x99 sys/kern/kern_rwlock.c:355 in6_hasmulti(fffffd80764690f0,ffff800001598800) at in6_hasmulti+0x41 in6_lookupmulti sys/netinet6/in6.c:-1 [inline] in6_hasmulti(fffffd80764690f0,ffff800001598800) at in6_hasmulti+0x41 sys/netinet6/in6.c:1150 ip6_output(fffffd8076469000,ffffffff83987338,0,0,ffff80002a1fe840,0) at ip6_output+0x13bd sys/netinet6/ip6_output.c:507 mld6_sendpkt(ffff8000015a9580,83,0) 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(ffff8000ffffe298) at softclock_thread_mp+0x86 end trace frame: 0x0, count: -12