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 * 98431 31618 0 0 0x4000000 1K syz-executor 393062 14838 0 0 0 0 syz-executor 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(ffff800000c31078,1,0) at witness_checkorder+0x122c sys/kern/subr_witness.c:854 rw_do_enter_read(ffff800000c31060,0) at rw_do_enter_read+0x99 sys/kern/kern_rwlock.c:355 in6_hasmulti(fffffd807eb5d7f0,ffff800000c31000) at in6_hasmulti+0x41 in6_lookupmulti sys/netinet6/in6.c:-1 [inline] in6_hasmulti(fffffd807eb5d7f0,ffff800000c31000) at in6_hasmulti+0x41 sys/netinet6/in6.c:1150 ip6_output(fffffd807eb5d700,ffffffff839eee58,0,0,ffff80003c003f30,0) at ip6_output+0x13bd sys/netinet6/ip6_output.c:507 mld6_sendpkt(ffff8000015adf80,83,0) at mld6_sendpkt+0x385 sys/netinet6/mld6.c:499 mld6_start_listening(ffff8000015adf80,ffff800000c31000) at mld6_start_listening+0xe7 sys/netinet6/mld6.c:139 in6_addmulti(ffff80003c0042d8,ffff800000c31000,ffff80003c00434c) at in6_addmulti+0x3d7 sys/netinet6/in6.c:1084 in6_joingroup(ffff800000c31000,ffff80003c0042d8,ffff80003c00434c) at in6_joingroup+0x6c sys/netinet6/in6.c:-1 in6_update_ifa(ffff800000c31000,ffff80003c004520,0) at in6_update_ifa+0x1a86 sys/netinet6/in6.c:-1 in6_ioctl_change_ifaddr(8080691a,ffff80003c004520,ffff800000c31000) at in6_ioctl_change_ifaddr+0x64e sys/netinet6/in6.c:352 ifioctl(ffff800010fdd790,8080691a,ffff80003c004520,ffff8000fffe4028) at ifioctl+0x1714 pru_control sys/sys/protosw.h:353 [inline] ifioctl(ffff800010fdd790,8080691a,ffff80003c004520,ffff8000fffe4028) at ifioctl+0x1714 sys/net/if.c:2554 sys_ioctl(ffff8000fffe4028,ffff80003c004700,ffff80003c004650) at sys_ioctl+0x674 sys/kern/sys_generic.c:-1 end trace frame: 0xffff80003c0046f0, count: 0 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(ffff800000c31078,1,0) at witness_checkorder+0x122c sys/kern/subr_witness.c:854 rw_do_enter_read(ffff800000c31060,0) at rw_do_enter_read+0x99 sys/kern/kern_rwlock.c:355 in6_hasmulti(fffffd807eb5d7f0,ffff800000c31000) at in6_hasmulti+0x41 in6_lookupmulti sys/netinet6/in6.c:-1 [inline] in6_hasmulti(fffffd807eb5d7f0,ffff800000c31000) at in6_hasmulti+0x41 sys/netinet6/in6.c:1150 ip6_output(fffffd807eb5d700,ffffffff839eee58,0,0,ffff80003c003f30,0) at ip6_output+0x13bd sys/netinet6/ip6_output.c:507 mld6_sendpkt(ffff8000015adf80,83,0) at mld6_sendpkt+0x385 sys/netinet6/mld6.c:499 mld6_start_listening(ffff8000015adf80,ffff800000c31000) at mld6_start_listening+0xe7 sys/netinet6/mld6.c:139 in6_addmulti(ffff80003c0042d8,ffff800000c31000,ffff80003c00434c) at in6_addmulti+0x3d7 sys/netinet6/in6.c:1084 in6_joingroup(ffff800000c31000,ffff80003c0042d8,ffff80003c00434c) at in6_joingroup+0x6c sys/netinet6/in6.c:-1 in6_update_ifa(ffff800000c31000,ffff80003c004520,0) at in6_update_ifa+0x1a86 sys/netinet6/in6.c:-1 in6_ioctl_change_ifaddr(8080691a,ffff80003c004520,ffff800000c31000) at in6_ioctl_change_ifaddr+0x64e sys/netinet6/in6.c:352 ifioctl(ffff800010fdd790,8080691a,ffff80003c004520,ffff8000fffe4028) at ifioctl+0x1714 pru_control sys/sys/protosw.h:353 [inline] ifioctl(ffff800010fdd790,8080691a,ffff80003c004520,ffff8000fffe4028) at ifioctl+0x1714 sys/net/if.c:2554 sys_ioctl(ffff8000fffe4028,ffff80003c004700,ffff80003c004650) at sys_ioctl+0x674 sys/kern/sys_generic.c:-1 syscall(ffff80003c004700) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c004700) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x4864fbb1000, count: -16 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff80003c003b80 rbx 0xffff8000299dee07 rdx 0xffff800001589680 rcx 0xffff8000fffe4028 rax 0xffff8000299ddff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x49f9e5146bf56fa8 r11 0xaa01fa9d0da3a171 r12 0xffff8000299dec08 r13 0 r14 0 r15 0x1 rip 0xffffffff810e0165 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c003b70 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=98431 pid=31618 tcnt=2 stat=onproc flags process=0 proc=4000000 runpri=32, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000fffe5250,0xffffffff8393dc18 process=0xffff8000fffe8018 user=0xffff80003bfff000, vmspace=0xfffffd806c750208 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 50120 143835 23441 0 2 0 syz-executor 31618 309440 23221 0 2 0 syz-executor *31618 98431 23221 0 7 0x4000000 syz-executor 14838 393062 37147 0 7 0 syz-executor 14838 117483 37147 0 3 0x4000080 sbwait syz-executor 67035 384156 77598 0 2 0 syz-executor 67035 147658 77598 0 3 0x4000080 fsleep syz-executor 67035 289621 77598 0 3 0x4000080 fsleep syz-executor 73857 346046 17700 0 2 0 syz-executor 73857 190153 17700 0 3 0x4000080 fsleep syz-executor 79020 127524 92913 0 2 0 syz-executor 79020 58478 92913 0 3 0x4000080 fsleep syz-executor 81808 5254 44456 60929 2 0x10 syz-executor 81808 35538 44456 60929 3 0x4000090 fsleep syz-executor 67644 160273 75958 0 2 0 syz-executor 67644 199460 75958 0 2 0x4000000 syz-executor 23221 181230 37249 0 3 0x82 nanoslp syz-executor 44456 69743 37249 0 3 0x82 nanoslp syz-executor 23441 140445 37249 0 3 0x82 nanoslp syz-executor 77598 77893 37249 0 3 0x82 nanoslp syz-executor 37147 361858 37249 0 3 0x82 nanoslp syz-executor 75958 219063 37249 0 3 0x82 nanoslp syz-executor 17700 7833 37249 0 3 0x82 nanoslp syz-executor 92913 194535 37249 0 3 0x82 nanoslp syz-executor 37249 140288 63182 0 3 0x82 kqread syz-executor 63182 89067 88102 0 3 0x10008a sigsusp ksh 88102 294063 36759 0 3 0x98 kqread sshd-session 36759 125398 20314 0 3 0x92 kqread sshd-session 58784 252736 1 0 3 0x100083 ttyin getty 20314 349000 1 0 3 0x88 kqread sshd 59353 495041 63080 74 3 0x1100092 bpf pflogd 63080 199163 1 0 3 0x80 sbwait pflogd 58359 293744 25847 73 3 0x1100090 kqread syslogd 25847 70665 1 0 3 0x100082 sbwait syslogd 56283 185512 1 0 3 0x100080 kqread resolvd 13617 428965 55327 77 2 0x100092 dhcpleased 74150 431316 55327 77 3 0x100092 kqread dhcpleased 55327 93382 1 0 3 0x80 kqread dhcpleased 29673 69795 0 0 3 0x14200 pause smr 2759 337401 0 0 2 0x14200 zerothread 93198 386696 0 0 3 0x14200 aiodoned aiodoned 69007 427132 0 0 3 0x14200 syncer update 80856 37208 0 0 3 0x14200 cleaner cleaner 86368 38816 0 0 3 0x14200 reaper reaper 23678 284621 0 0 3 0x14200 pgdaemon pagedaemon 70209 28711 0 0 3 0x14200 bored viomb 43265 16133 0 0 3 0x40014200 acpi0 acpi0 11173 390797 0 0 3 0x40014200 idle1 8658 312762 0 0 3 0x14200 bored softnet1 45717 319168 0 0 3 0x14200 bored softnet0 88827 450968 0 0 3 0x14200 bored systqmp 72450 434320 0 0 3 0x14200 bored systq 84313 614 0 0 3 0x14200 tmoslp softclockmp 21197 297017 0 0 3 0x40014200 tmoslp softclock 43236 356791 0 0 3 0x40014200 idle0 1 60462 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 31618 (syz-executor) thread 0xffff8000fffe4028 (98431) exclusive rwlock maddr r = 0 (0xffff800000c31078) #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 in6_addmulti+0x28c in6_lookupmulti sys/netinet6/in6.c:-1 [inline] #2 in6_addmulti+0x28c sys/netinet6/in6.c:1068 #3 in6_joingroup+0x6c sys/netinet6/in6.c:-1 #4 in6_update_ifa+0x1a86 sys/netinet6/in6.c:-1 #5 in6_ioctl_change_ifaddr+0x64e sys/netinet6/in6.c:352 #6 ifioctl+0x1714 pru_control sys/sys/protosw.h:353 [inline] #6 ifioctl+0x1714 sys/net/if.c:2554 #7 sys_ioctl+0x674 sys/kern/sys_generic.c:-1 #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 exclusive 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_write+0x419 sys/kern/kern_rwlock.c:320 #2 in6_ioctl_change_ifaddr+0x10b sys/netinet6/in6.c:291 #3 ifioctl+0x1714 pru_control sys/sys/protosw.h:353 [inline] #3 ifioctl+0x1714 sys/net/if.c:2554 #4 sys_ioctl+0x674 sys/kern/sys_generic.c:-1 #5 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #5 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #6 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 1 (0xffffffff83902dc8) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 ifioctl+0x47f if_unit sys/net/if.c:-1 [inline] #1 ifioctl+0x47f sys/net/if.c:2195 #2 sys_ioctl+0x674 sys/kern/sys_generic.c:-1 #3 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #3 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #4 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11071 12343K 12343K 166960K 12178 0 pcb 21 12K 12K 166960K 30 0 rtable 237 6K 7K 166960K 351 0 pf 34 17K 18K 166960K 45 0 ifaddr 44 7K 7K 166960K 46 0 ifgroup 55 2K 2K 166960K 55 0 sysctl 3 1K 9K 166960K 7 0 counters 70 37K 37K 166960K 70 0 ioctlops 0 0K 4K 166960K 1485 0 iov 1 8K 8K 166960K 2 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1340 84K 84K 166960K 1371 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 1692 195K 286K 166960K 12470 0 file desc 18 65K 89K 166960K 157 0 proc 71 115K 180K 166960K 529 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 1 0 in_multi 101 7K 7K 166960K 107 0 ether_multi 2 0K 0K 166960K 4 0 mrt 1 0K 0K 166960K 1 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 49 228K 228K 166960K 49 0 exec 0 0K 1K 166960K 375 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 233 151K 161K 166960K 3330 0 UVM aobj 5 2K 2K 166960K 5 0 pinsyscall 43 86K 104K 166960K 1284 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 3 0 NDP 16 0K 1K 166960K 28 0 temp 34 8666K 8731K 166960K 5791 0 kqueue 15 24K 24K 166960K 25 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 34 0 30 1 0 1 1 0 8 0 rtentry 176 111 0 1 5 0 5 5 0 8 0 unpcb 144 50 0 28 1 0 1 1 0 8 0 syncache 336 3 0 3 1 0 1 1 0 8 1 tcpcb 736 15 0 11 1 0 1 1 0 8 0 arp 136 18 0 0 1 0 1 1 0 8 0 inpcb 328 83 0 72 2 0 2 2 0 8 1 nd6 152 24 0 0 1 0 1 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 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 19 0 0 1 0 1 1 0 8 0 pfstkey 128 19 0 0 1 0 1 1 0 8 0 pfstate 448 19 0 0 3 0 3 3 0 8 0 pfrule 1344 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 452 0 0 29 0 29 29 0 8 0 art_table 40 453 0 0 5 0 5 5 0 8 0 art_node 32 111 0 11 1 0 1 1 0 8 0 shmpl 112 2 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1592 0 78 95 0 95 95 0 8 0 ffsino 296 1592 0 78 117 0 117 117 0 8 0 nchpl 144 1808 0 113 64 0 64 64 0 8 0 vnodes 216 1687 0 0 94 0 94 94 0 8 0 namei 1024 5413 0 5413 1 0 1 1 0 8 1 percpumem 16 50 0 0 1 0 1 1 0 8 0 kstatmem 264 26 0 0 2 0 2 2 0 8 0 scxspl 216 6088 0 6088 4 2 2 3 1 8 2 plimitpl 152 30 0 12 1 0 1 1 0 8 0 sigapl 424 466 0 418 7 0 7 7 0 8 1 knotepl 120 525 0 0 16 0 16 16 0 8 0 kqueuepl 224 23 0 11 1 0 1 1 0 8 0 pipepl 344 118 0 91 3 0 3 3 0 8 0 fdescpl 528 450 0 418 3 0 3 3 0 8 0 filepl 160 1584 0 1361 10 0 10 10 0 8 0 lockfpl 104 10 0 8 1 0 1 1 0 8 0 lockfspl 48 6 0 4 1 0 1 1 0 8 0 sessionpl 144 22 0 13 1 0 1 1 0 8 0 pgrppl 48 30 0 13 1 0 1 1 0 8 0 ucredpl 104 89 0 74 1 0 1 1 0 8 0 zombiepl 144 418 0 418 1 0 1 1 0 8 1 processpl 1232 466 0 418 5 0 5 5 0 8 1 procpl 664 504 0 448 6 0 6 6 0 8 0 sockpl 752 168 0 130 4 0 4 4 0 8 0 mcl8k 8192 1 0 0 1 0 1 1 0 8 0 mcl4k 4096 116 0 0 15 0 15 15 0 8 0 mcl2k 2048 34 0 0 5 0 5 5 0 8 0 mtagpl 96 7 0 0 1 0 1 1 0 8 0 mbufpl 256 165 0 0 11 0 11 11 0 8 0 bufpl 280 2423 0 130 164 0 164 164 0 8 0 anonpl 32 3934 0 0 32 0 32 32 0 246 0 amapchunkpl 152 9198 0 8725 20 0 20 20 0 158 1 amappl16 200 2010 0 1991 5 1 4 5 0 8 3 amappl15 192 7 0 7 1 1 0 1 0 8 0 amappl14 184 8 0 8 1 1 0 1 0 8 0 amappl13 176 424 0 423 1 0 1 1 0 8 0 amappl12 168 806 0 763 3 0 3 3 0 8 0 amappl11 160 8 0 8 1 1 0 1 0 8 0 amappl10 152 50 0 36 1 0 1 1 0 8 0 amappl9 144 245 0 245 1 1 0 1 0 8 0 amappl8 136 33 0 31 1 0 1 1 0 8 0 amappl7 128 79 0 78 1 0 1 1 0 8 0 amappl6 120 369 0 356 1 0 1 1 0 8 0 amappl5 112 85 0 75 1 0 1 1 0 8 0 amappl4 104 411 0 384 1 0 1 1 0 8 0 amappl3 96 1384 0 1295 4 1 3 3 0 8 0 amappl2 88 562 0 484 2 0 2 2 0 8 0 amappl1 80 9097 0 8506 15 0 15 15 0 8 1 amappl 88 2603 0 2446 4 0 4 4 0 92 0 uvmvnodes 80 99 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 4 0 0 1 0 1 1 0 8 0 uaddrrnd 24 450 0 418 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 450 0 418 1 0 1 1 0 8 0 vmmpekpl 168 5448 0 5416 2 0 2 2 0 8 0 vmmpepl 168 36761 0 34845 87 0 87 87 0 357 3 vmsppl 488 449 0 418 5 0 5 5 0 8 1 rwobjpl 80 13710 0 12709 24 0 24 24 0 8 1 pdppl 4096 908 0 836 96 18 78 84 0 8 6 pvpl 32 11430 0 0 93 0 93 93 0 265 0 pmappl 256 449 0 418 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 268 0 20 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 __mp_lock(ffffffff83902bc0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83902bc0) at __mp_lock+0x192 sys/kern/kern_lock.c:173 softintr_dispatch(0) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:862 Xsoftclock() at Xsoftclock+0x27 end of kernel end trace frame: 0x7d1252b79b20, count: 8 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 __mp_lock(ffffffff83902bc0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83902bc0) at __mp_lock+0x192 sys/kern/kern_lock.c:173 softintr_dispatch(0) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:862 Xsoftclock() at Xsoftclock+0x27 end of kernel end trace frame: 0x7d1252b79b20, count: -7 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(ffff800000c31078,1,0) at witness_checkorder+0x122c sys/kern/subr_witness.c:854 rw_do_enter_read(ffff800000c31060,0) at rw_do_enter_read+0x99 sys/kern/kern_rwlock.c:355 in6_hasmulti(fffffd807eb5d7f0,ffff800000c31000) at in6_hasmulti+0x41 in6_lookupmulti sys/netinet6/in6.c:-1 [inline] in6_hasmulti(fffffd807eb5d7f0,ffff800000c31000) at in6_hasmulti+0x41 sys/netinet6/in6.c:1150 ip6_output(fffffd807eb5d700,ffffffff839eee58,0,0,ffff80003c003f30,0) at ip6_output+0x13bd sys/netinet6/ip6_output.c:507 mld6_sendpkt(ffff8000015adf80,83,0) at mld6_sendpkt+0x385 sys/netinet6/mld6.c:499 mld6_start_listening(ffff8000015adf80,ffff800000c31000) at mld6_start_listening+0xe7 sys/netinet6/mld6.c:139 in6_addmulti(ffff80003c0042d8,ffff800000c31000,ffff80003c00434c) at in6_addmulti+0x3d7 sys/netinet6/in6.c:1084 in6_joingroup(ffff800000c31000,ffff80003c0042d8,ffff80003c00434c) at in6_joingroup+0x6c sys/netinet6/in6.c:-1 in6_update_ifa(ffff800000c31000,ffff80003c004520,0) at in6_update_ifa+0x1a86 sys/netinet6/in6.c:-1 in6_ioctl_change_ifaddr(8080691a,ffff80003c004520,ffff800000c31000) at in6_ioctl_change_ifaddr+0x64e sys/netinet6/in6.c:352 ifioctl(ffff800010fdd790,8080691a,ffff80003c004520,ffff8000fffe4028) at ifioctl+0x1714 pru_control sys/sys/protosw.h:353 [inline] ifioctl(ffff800010fdd790,8080691a,ffff80003c004520,ffff8000fffe4028) at ifioctl+0x1714 sys/net/if.c:2554 sys_ioctl(ffff8000fffe4028,ffff80003c004700,ffff80003c004650) at sys_ioctl+0x674 sys/kern/sys_generic.c:-1 end trace frame: 0xffff80003c0046f0, count: 0 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(ffff800000c31078,1,0) at witness_checkorder+0x122c sys/kern/subr_witness.c:854 rw_do_enter_read(ffff800000c31060,0) at rw_do_enter_read+0x99 sys/kern/kern_rwlock.c:355 in6_hasmulti(fffffd807eb5d7f0,ffff800000c31000) at in6_hasmulti+0x41 in6_lookupmulti sys/netinet6/in6.c:-1 [inline] in6_hasmulti(fffffd807eb5d7f0,ffff800000c31000) at in6_hasmulti+0x41 sys/netinet6/in6.c:1150 ip6_output(fffffd807eb5d700,ffffffff839eee58,0,0,ffff80003c003f30,0) at ip6_output+0x13bd sys/netinet6/ip6_output.c:507 mld6_sendpkt(ffff8000015adf80,83,0) at mld6_sendpkt+0x385 sys/netinet6/mld6.c:499 mld6_start_listening(ffff8000015adf80,ffff800000c31000) at mld6_start_listening+0xe7 sys/netinet6/mld6.c:139 in6_addmulti(ffff80003c0042d8,ffff800000c31000,ffff80003c00434c) at in6_addmulti+0x3d7 sys/netinet6/in6.c:1084 in6_joingroup(ffff800000c31000,ffff80003c0042d8,ffff80003c00434c) at in6_joingroup+0x6c sys/netinet6/in6.c:-1 in6_update_ifa(ffff800000c31000,ffff80003c004520,0) at in6_update_ifa+0x1a86 sys/netinet6/in6.c:-1 in6_ioctl_change_ifaddr(8080691a,ffff80003c004520,ffff800000c31000) at in6_ioctl_change_ifaddr+0x64e sys/netinet6/in6.c:352 ifioctl(ffff800010fdd790,8080691a,ffff80003c004520,ffff8000fffe4028) at ifioctl+0x1714 pru_control sys/sys/protosw.h:353 [inline] ifioctl(ffff800010fdd790,8080691a,ffff80003c004520,ffff8000fffe4028) at ifioctl+0x1714 sys/net/if.c:2554 sys_ioctl(ffff8000fffe4028,ffff80003c004700,ffff80003c004650) at sys_ioctl+0x674 sys/kern/sys_generic.c:-1 syscall(ffff80003c004700) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c004700) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x4864fbb1000, count: -16