witness: shared lock of (rwlock) maddr while exclusively locked panic: excl->share Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 160743 88709 0 0 0 0 syz-executor *505685 23297 0 0x14000 0x200 1 softclockmp db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833b4a35) at panic+0x1e5 sys/kern/subr_prf.c:198 witness_checkorder(ffff800001588078,1,0) at witness_checkorder+0x122c sys/kern/subr_witness.c:854 rw_do_enter_read(ffff800001588060,0) at rw_do_enter_read+0x99 sys/kern/kern_rwlock.c:355 in6_hasmulti(fffffd806c8da7f0,ffff800001588000) at in6_hasmulti+0x41 in6_lookupmulti sys/netinet6/in6.c:-1 [inline] in6_hasmulti(fffffd806c8da7f0,ffff800001588000) at in6_hasmulti+0x41 sys/netinet6/in6.c:1150 ip6_output(fffffd806c8da700,ffffffff839eee58,0,0,ffff80002a1fe9e0,0) at ip6_output+0x13bd sys/netinet6/ip6_output.c:507 mld6_sendpkt(ffff800001551e00,83,0) 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(ffffffff83a15020) at pffasttimo+0x184 sys/kern/uipc_domain.c:-1 timeout_run(ffffffff83835dd8,ffffffff83a15020) at timeout_run+0x159 sys/kern/kern_timeout.c:698 softclock_thread_run(ffffffff83835dd8) at softclock_thread_run+0xe7 sys/kern/kern_timeout.c:842 softclock_thread_mp(ffff8000ffffe530) 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(ffffffff833b4a35) at panic+0x1e5 sys/kern/subr_prf.c:198 witness_checkorder(ffff800001588078,1,0) at witness_checkorder+0x122c sys/kern/subr_witness.c:854 rw_do_enter_read(ffff800001588060,0) at rw_do_enter_read+0x99 sys/kern/kern_rwlock.c:355 in6_hasmulti(fffffd806c8da7f0,ffff800001588000) at in6_hasmulti+0x41 in6_lookupmulti sys/netinet6/in6.c:-1 [inline] in6_hasmulti(fffffd806c8da7f0,ffff800001588000) at in6_hasmulti+0x41 sys/netinet6/in6.c:1150 ip6_output(fffffd806c8da700,ffffffff839eee58,0,0,ffff80002a1fe9e0,0) at ip6_output+0x13bd sys/netinet6/ip6_output.c:507 mld6_sendpkt(ffff800001551e00,83,0) 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(ffffffff83a15020) at pffasttimo+0x184 sys/kern/uipc_domain.c:-1 timeout_run(ffffffff83835dd8,ffffffff83a15020) at timeout_run+0x159 sys/kern/kern_timeout.c:698 softclock_thread_run(ffffffff83835dd8) at softclock_thread_run+0xe7 sys/kern/kern_timeout.c:842 softclock_thread_mp(ffff8000ffffe530) at softclock_thread_mp+0x86 end trace frame: 0x0, count: -12 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff80002a1fe630 rbx 0xffff8000299dee07 rdx 0 rcx 0xffff8000ffffe530 rax 0xffff8000299ddff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0xb052c5c20e83426e r11 0xdc54a320578959a0 r12 0xffff8000299dec08 r13 0 r14 0 r15 0x1 rip 0xffffffff810e0165 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80002a1fe620 ss 0 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (softclockmp) tid=505685 pid=23297 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=0xffff8000ffffe7c8,0xffff8000ffffe010 process=0xffff8000ffffa680 user=0xffff80002a1f9000, vmspace=0xffffffff83a0c438 estcpu=0, cpticks=2, pctcpu=0.0, user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 51201 402599 80012 0 2 0 syz-executor 51201 263611 80012 0 3 0x4000080 fsleep syz-executor 88709 160743 70284 0 7 0 syz-executor 88709 282232 70284 0 2 0x4000000 syz-executor 50141 37083 20014 0 2 0 syz-executor 50141 440058 20014 0 2 0x4000000 syz-executor 50141 104412 20014 0 3 0x4000000 inode syz-executor 44179 406656 43932 0 3 0x80 nanoslp syz-executor 44179 219429 43932 0 3 0x4000080 kqsel syz-executor 44179 396868 43932 0 3 0x4000080 fsleep syz-executor 62765 495352 1330 0 3 0x80 nanoslp syz-executor 62765 80854 1330 0 3 0x4000080 ttyretype syz-executor 62765 327508 1330 0 3 0x4000080 fsleep syz-executor 69069 148060 88142 0 2 0xc80 syz-executor 69069 503441 88142 0 3 0x4000080 kqsel syz-executor 69069 401099 88142 0 3 0x4000080 fsleep syz-executor 86559 69772 62179 0 3 0x3000 suspend syz-executor 86559 200483 62179 0 2 0x4081000 syz-executor 86559 126965 62179 0 3 0x4081000 inode syz-executor 87902 76929 0 0 3 0x14200 acct acct 43932 115973 25872 0 3 0x82 nanoslp syz-executor 70284 400259 25872 0 3 0x82 nanoslp syz-executor 1330 69664 25872 0 3 0x82 nanoslp syz-executor 62179 489069 25872 0 3 0x82 wait syz-executor 47270 203393 25872 0 2 0x2 syz-executor 88142 170863 25872 0 3 0x82 nanoslp syz-executor 20014 513191 25872 0 2 0xc82 syz-executor 80012 85863 25872 0 2 0xc82 syz-executor 25872 156098 1976 0 3 0x82 kqread syz-executor 1976 136291 34107 0 3 0x10008a sigsusp ksh 34107 498182 35539 0 3 0x98 kqread sshd-session 35539 169396 1672 0 3 0x92 kqread sshd-session 59512 522802 1 0 3 0x100083 ttyin getty 1672 445860 1 0 3 0x88 kqread sshd 2961 110829 59329 74 3 0x1100092 bpf pflogd 59329 82308 1 0 3 0x80 sbwait pflogd 46484 271387 30728 73 3 0x1100090 kqread syslogd 30728 194634 1 0 3 0x100082 sbwait syslogd 39548 38195 1 0 3 0x100080 kqread resolvd 3048 331022 84622 77 3 0x100092 kqread dhcpleased 27831 422124 84622 77 3 0x100092 kqread dhcpleased 84622 164870 1 0 3 0x80 kqread dhcpleased 12000 137523 0 0 3 0x14200 bored smr 25558 9605 0 0 3 0x14200 pgzero zerothread 59131 144840 0 0 3 0x14200 aiodoned aiodoned 78448 330905 0 0 3 0x14200 syncer update 57112 340334 0 0 3 0x14200 cleaner cleaner 33148 305617 0 0 3 0x14200 reaper reaper 61580 23037 0 0 3 0x14200 pgdaemon pagedaemon 3831 173703 0 0 3 0x14200 bored viomb 63619 127400 0 0 3 0x40014200 acpi0 acpi0 39602 109670 0 0 3 0x40014200 idle1 24153 198882 0 0 3 0x14200 bored softnet1 76741 446520 0 0 3 0x14200 bored softnet0 16511 486120 0 0 3 0x14200 bored systqmp 34828 357685 0 0 3 0x14200 bored systq *23297 505685 0 0 7 0x14200 softclockmp 30032 283954 0 0 3 0x40014200 tmoslp softclock 16568 57157 0 0 3 0x40014200 idle0 1 137253 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 50141 (syz-executor) thread 0xffff80002a2614d8 (440058) exclusive rrwlock inode r = 0 (0xfffffd806175fda0) #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 50141 (syz-executor) thread 0xffff80003c431a18 (104412) exclusive rrwlock inode r = 0 (0xfffffd8077bb3118) #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 uipc_bind+0x328 sys/kern/uipc_usrreq.c:371 #8 sys_bind+0x2f6 sys/kern/uipc_syscalls.c:190 #9 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #9 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #10 Xsyscall+0x128 Process 86559 (syz-executor) thread 0xffff80003c430a88 (200483) exclusive rrwlock inode r = 0 (0xfffffd806175f0e8) #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 23297 (softclockmp) thread 0xffff8000ffffe530 (505685) exclusive rwlock maddr r = 0 (0xffff800001588078) #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 (0xffffffff83891cc0) #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 (0xffffffff83835d78) #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 11087 12219K 12414K 166960K 12658 0 pcb 18 14K 15K 166960K 114 0 rtable 207 6K 7K 166960K 400 0 pf 32 17K 20K 166960K 76 0 ifaddr 39 6K 7K 166960K 66 0 ifgroup 51 2K 2K 166960K 98 0 sysctl 1 1K 9K 166960K 9 0 counters 68 36K 37K 166960K 108 0 ioctlops 0 0K 5K 166960K 1523 0 iov 0 0K 16K 166960K 10 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1373 86K 87K 166960K 1632 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 7 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 17 0 dirhash 12 2K 2K 166960K 15 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 106K 166960K 426 0 sigio 0 0K 0K 166960K 6 0 proc 71 115K 164K 166960K 553 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 15 0 in_multi 88 6K 7K 166960K 113 0 ether_multi 1 0K 0K 166960K 1 0 mrt 1 0K 0K 166960K 2 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 193 864K 864K 166960K 193 0 exec 0 0K 1K 166960K 395 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 251 175K 193K 166960K 5691 0 UVM aobj 8 2K 2K 166960K 9 0 pinsyscall 42 84K 100K 166960K 1563 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 24 0 NDP 11 0K 1K 166960K 40 0 temp 42 8667K 8734K 166960K 17027 0 kqueue 13 20K 29K 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 59 0 56 1 0 1 1 0 8 0 rtentry 176 121 0 30 6 0 6 6 0 8 0 unpcb 144 156 0 138 2 0 2 2 0 8 1 syncache 336 7 0 7 1 0 1 1 0 8 1 tcpqe 32 3 0 3 1 0 1 1 0 8 1 tcpcb 736 92 0 86 1 0 1 1 0 8 0 arp 136 18 0 2 1 0 1 1 0 8 0 inpcb 328 361 0 351 7 0 7 7 0 8 5 nd6 152 25 0 3 1 0 1 1 0 8 0 pkpcb 40 3 0 3 1 1 0 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1192 12 0 12 1 0 1 1 0 8 1 pppxif 1576 6 0 6 1 0 1 1 0 8 1 pffrag 232 5 0 3 1 0 1 1 0 482 0 pffrnode 88 5 0 3 1 0 1 1 0 8 0 pffrent 40 9 0 7 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 36 0 0 1 0 1 1 0 8 0 pfstkey 128 36 0 0 2 0 2 2 0 8 0 pfstate 448 36 0 0 4 0 4 4 0 8 0 pfrule 1344 22 0 17 2 1 1 2 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 510 0 109 29 1 28 29 0 8 1 art_table 40 512 0 109 5 0 5 5 0 8 0 art_node 32 120 0 38 1 0 1 1 0 8 0 sysvmsgpl 40 1 0 0 1 0 1 1 0 8 0 semapl 112 13 0 3 1 0 1 1 0 8 0 shmpl 112 6 0 1 1 0 1 1 0 8 0 dirhash 1024 19 0 2 3 0 3 3 0 8 0 dino2pl 256 2115 0 605 96 0 96 96 0 8 0 ffsino 296 2115 0 605 118 0 118 118 0 8 0 nchpl 144 2707 0 1006 64 0 64 64 0 8 0 vnodes 216 2358 0 0 131 0 131 131 0 8 0 namei 1024 8659 0 8658 1 0 1 1 0 8 0 percpumem 16 69 0 20 1 0 1 1 0 8 0 kstatmem 264 50 0 26 3 0 3 3 0 8 1 scxspl 216 11154 0 11154 3 2 1 2 1 8 1 plimitpl 152 137 0 115 1 0 1 1 0 8 0 sigapl 424 732 0 684 7 1 6 7 0 8 0 knotepl 120 502 0 0 16 0 16 16 0 8 0 kqueuepl 224 148 0 137 3 0 3 3 0 8 2 pipepl 344 134 0 107 3 0 3 3 0 8 0 fdescpl 528 715 0 684 3 0 3 3 0 8 0 filepl 160 3556 0 3335 14 0 14 14 0 8 4 lockfpl 104 101 0 99 1 0 1 1 0 8 0 lockfspl 48 45 0 43 1 0 1 1 0 8 0 sessionpl 144 26 0 17 1 0 1 1 0 8 0 pgrppl 48 37 0 20 1 0 1 1 0 8 0 ucredpl 104 459 0 446 1 0 1 1 0 8 0 zombiepl 144 685 0 684 1 0 1 1 0 8 0 processpl 1232 732 0 684 5 0 5 5 0 8 0 procpl 664 1204 0 1144 6 0 6 6 0 8 0 sosppl 176 1 0 1 1 0 1 1 0 8 1 sockpl 752 586 0 555 10 0 10 10 0 8 6 mcl64k 65536 2 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 4 0 0 1 0 1 1 0 8 0 mcl4k 4096 121 0 0 16 0 16 16 0 8 0 mcl2k 2048 32 0 0 4 0 4 4 0 8 0 mtagpl 96 12 0 0 1 0 1 1 0 8 0 mbufpl 256 170 0 0 11 0 11 11 0 8 0 bufpl 280 4272 0 131 296 0 296 296 0 8 0 anonpl 32 7959 0 0 65 0 65 65 0 246 0 amapchunkpl 152 17733 0 17211 28 0 28 28 0 158 7 amappl16 200 2303 0 2020 17 2 15 15 0 8 0 amappl15 192 7 0 7 1 1 0 1 0 8 0 amappl14 184 25 0 25 1 1 0 1 0 8 0 amappl13 176 427 0 426 1 0 1 1 0 8 0 amappl12 168 1155 0 1113 3 0 3 3 0 8 0 amappl11 160 3 0 3 1 1 0 1 0 8 0 amappl10 152 50 0 36 1 0 1 1 0 8 0 amappl9 144 255 0 255 1 1 0 1 0 8 0 amappl8 136 68 0 66 1 0 1 1 0 8 0 amappl7 128 93 0 92 1 0 1 1 0 8 0 amappl6 120 281 0 268 1 0 1 1 0 8 0 amappl5 112 75 0 64 1 0 1 1 0 8 0 amappl4 104 435 0 405 1 0 1 1 0 8 0 amappl3 96 2906 0 2810 4 1 3 3 0 8 0 amappl2 88 856 0 780 2 0 2 2 0 8 0 amappl1 80 11263 0 10668 14 0 14 14 0 8 0 amappl 88 4894 0 4721 5 0 5 5 0 92 0 uvmvnodes 80 108 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 128 253 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 8 0 1 1 0 1 1 0 8 0 uaddrrnd 24 715 0 684 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 715 0 684 1 0 1 1 0 8 0 vmmpekpl 168 7692 0 7658 2 0 2 2 0 8 0 vmmpepl 168 53645 0 51468 98 0 98 98 0 357 1 vmsppl 488 714 0 684 5 0 5 5 0 8 0 rwobjpl 80 17644 0 16345 27 0 27 27 0 8 0 pdppl 4096 1438 0 1368 100 28 72 84 0 8 2 pvpl 32 15779 0 0 129 1 128 128 0 265 0 pmappl 256 714 0 684 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 277 0 31 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff837e3ff0) 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: 0x7411c611f9c0, count: 12 ddb{0}> trace x86_ipi_db(ffffffff837e3ff0) 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: 0x7411c611f9c0, 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(ffffffff833b4a35) at panic+0x1e5 sys/kern/subr_prf.c:198 witness_checkorder(ffff800001588078,1,0) at witness_checkorder+0x122c sys/kern/subr_witness.c:854 rw_do_enter_read(ffff800001588060,0) at rw_do_enter_read+0x99 sys/kern/kern_rwlock.c:355 in6_hasmulti(fffffd806c8da7f0,ffff800001588000) at in6_hasmulti+0x41 in6_lookupmulti sys/netinet6/in6.c:-1 [inline] in6_hasmulti(fffffd806c8da7f0,ffff800001588000) at in6_hasmulti+0x41 sys/netinet6/in6.c:1150 ip6_output(fffffd806c8da700,ffffffff839eee58,0,0,ffff80002a1fe9e0,0) at ip6_output+0x13bd sys/netinet6/ip6_output.c:507 mld6_sendpkt(ffff800001551e00,83,0) 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(ffffffff83a15020) at pffasttimo+0x184 sys/kern/uipc_domain.c:-1 timeout_run(ffffffff83835dd8,ffffffff83a15020) at timeout_run+0x159 sys/kern/kern_timeout.c:698 softclock_thread_run(ffffffff83835dd8) at softclock_thread_run+0xe7 sys/kern/kern_timeout.c:842 softclock_thread_mp(ffff8000ffffe530) 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(ffffffff833b4a35) at panic+0x1e5 sys/kern/subr_prf.c:198 witness_checkorder(ffff800001588078,1,0) at witness_checkorder+0x122c sys/kern/subr_witness.c:854 rw_do_enter_read(ffff800001588060,0) at rw_do_enter_read+0x99 sys/kern/kern_rwlock.c:355 in6_hasmulti(fffffd806c8da7f0,ffff800001588000) at in6_hasmulti+0x41 in6_lookupmulti sys/netinet6/in6.c:-1 [inline] in6_hasmulti(fffffd806c8da7f0,ffff800001588000) at in6_hasmulti+0x41 sys/netinet6/in6.c:1150 ip6_output(fffffd806c8da700,ffffffff839eee58,0,0,ffff80002a1fe9e0,0) at ip6_output+0x13bd sys/netinet6/ip6_output.c:507 mld6_sendpkt(ffff800001551e00,83,0) 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(ffffffff83a15020) at pffasttimo+0x184 sys/kern/uipc_domain.c:-1 timeout_run(ffffffff83835dd8,ffffffff83a15020) at timeout_run+0x159 sys/kern/kern_timeout.c:698 softclock_thread_run(ffffffff83835dd8) at softclock_thread_run+0xe7 sys/kern/kern_timeout.c:842 softclock_thread_mp(ffff8000ffffe530) at softclock_thread_mp+0x86 end trace frame: 0x0, count: -12