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 *524117 87295 0 0x2 0 0K ifconfig 114531 27284 0 0 0 1 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(ffff800001592878,1,0) at witness_checkorder+0x122c sys/kern/subr_witness.c:854 rw_do_enter_read(ffff800001592860,0) at rw_do_enter_read+0x99 sys/kern/kern_rwlock.c:355 in6_hasmulti(fffffd807ea87df0,ffff800001592800) at in6_hasmulti+0x41 in6_lookupmulti sys/netinet6/in6.c:-1 [inline] in6_hasmulti(fffffd807ea87df0,ffff800001592800) at in6_hasmulti+0x41 sys/netinet6/in6.c:1150 ip6_output(fffffd807ea87d00,ffffffff839eee58,0,1,ffff8000347d1260,0) at ip6_output+0x13bd sys/netinet6/ip6_output.c:507 mld6_sendpkt(ffff8000015b7780,83,0) at mld6_sendpkt+0x385 sys/netinet6/mld6.c:499 mld6_start_listening(ffff8000015b7780,ffff800001592800) at mld6_start_listening+0xe7 sys/netinet6/mld6.c:139 in6_addmulti(ffff8000347d1608,ffff800001592800,ffff8000347d167c) at in6_addmulti+0x3d7 sys/netinet6/in6.c:1084 in6_joingroup(ffff800001592800,ffff8000347d1608,ffff8000347d167c) at in6_joingroup+0x6c sys/netinet6/in6.c:-1 in6_update_ifa(ffff800001592800,ffff8000347d1700,0) at in6_update_ifa+0x1a86 sys/netinet6/in6.c:-1 in6_ifattach_linklocal(ffff800001592800,0) at in6_ifattach_linklocal+0x33b sys/netinet6/in6_ifattach.c:266 in6_ifattach(ffff800001592800) at in6_ifattach+0x2d0 sys/netinet6/in6_ifattach.c:384 ifioctl(ffff8000015afa88,801169ab,ffff8000347d18f0,ffff8000fffef770) at ifioctl+0x1b13 sys/net/if.c:2218 end trace frame: 0xffff8000347d19f0, 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{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic *cpu0: excl->share ddb{0}> 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(ffff800001592878,1,0) at witness_checkorder+0x122c sys/kern/subr_witness.c:854 rw_do_enter_read(ffff800001592860,0) at rw_do_enter_read+0x99 sys/kern/kern_rwlock.c:355 in6_hasmulti(fffffd807ea87df0,ffff800001592800) at in6_hasmulti+0x41 in6_lookupmulti sys/netinet6/in6.c:-1 [inline] in6_hasmulti(fffffd807ea87df0,ffff800001592800) at in6_hasmulti+0x41 sys/netinet6/in6.c:1150 ip6_output(fffffd807ea87d00,ffffffff839eee58,0,1,ffff8000347d1260,0) at ip6_output+0x13bd sys/netinet6/ip6_output.c:507 mld6_sendpkt(ffff8000015b7780,83,0) at mld6_sendpkt+0x385 sys/netinet6/mld6.c:499 mld6_start_listening(ffff8000015b7780,ffff800001592800) at mld6_start_listening+0xe7 sys/netinet6/mld6.c:139 in6_addmulti(ffff8000347d1608,ffff800001592800,ffff8000347d167c) at in6_addmulti+0x3d7 sys/netinet6/in6.c:1084 in6_joingroup(ffff800001592800,ffff8000347d1608,ffff8000347d167c) at in6_joingroup+0x6c sys/netinet6/in6.c:-1 in6_update_ifa(ffff800001592800,ffff8000347d1700,0) at in6_update_ifa+0x1a86 sys/netinet6/in6.c:-1 in6_ifattach_linklocal(ffff800001592800,0) at in6_ifattach_linklocal+0x33b sys/netinet6/in6_ifattach.c:266 in6_ifattach(ffff800001592800) at in6_ifattach+0x2d0 sys/netinet6/in6_ifattach.c:384 ifioctl(ffff8000015afa88,801169ab,ffff8000347d18f0,ffff8000fffef770) at ifioctl+0x1b13 sys/net/if.c:2218 sys_ioctl(ffff8000fffef770,ffff8000347d1ad0,ffff8000347d1a20) at sys_ioctl+0x674 sys/kern/sys_generic.c:-1 syscall(ffff8000347d1ad0) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff8000347d1ad0) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x780cf7256600, count: -17 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff8000347d0eb0 rbx 0xffffffff837e4e07 cpu_info_full_primary+0x2e07 rdx 0 rcx 0xffff8000fffef770 rax 0xffffffff837e3ff0 cpu_info_full_primary+0x1ff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x177b09a5d8041704 r11 0x8d2752185262859c r12 0xffffffff837e4c08 cpu_info_full_primary+0x2c08 r13 0 r14 0 r15 0x1 rip 0xffffffff810e0165 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff8000347d0ea0 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (ifconfig) tid=524117 pid=87295 tcnt=1 stat=onproc flags process=2 proc=0 runpri=55, usrpri=55, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000fffef4d8,0xffffffff8393dc18 process=0xffff80002a3bf038 user=0xffff8000347cc000, vmspace=0xfffffd806c791b90 estcpu=15, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND *87295 524117 44659 0 7 0x2 ifconfig 27284 114531 22342 0 7 0 syz-executor 44659 425111 523 0 3 0x10008a sigsusp sh 38253 82791 59205 0 3 0x3000 suspend syz-executor 38253 456880 59205 0 2 0x4081000 syz-executor 3149 29888 56492 -1 2 0x10 syz-executor 3149 348534 56492 -1 3 0x4000090 fsleep syz-executor 3149 325206 56492 -1 3 0x4000090 fsleep syz-executor 11987 407931 16874 0 2 0 syz-executor 11987 34049 16874 0 2 0x4000000 syz-executor 13295 269612 83328 0 2 0 syz-executor 13295 181819 83328 0 3 0x4000080 fsleep syz-executor 13295 58245 83328 0 3 0x4000080 fsleep syz-executor 69871 81548 33424 0 2 0 syz-executor 69871 242486 33424 0 3 0x4000080 fsleep syz-executor 69871 181653 33424 0 3 0x4000080 fsleep syz-executor 59205 93140 34262 0 3 0x82 nanoslp syz-executor 50384 29457 34262 0 3 0x2 biowait syz-executor 83328 277854 34262 0 3 0x82 nanoslp syz-executor 22342 61099 34262 0 3 0x82 nanoslp syz-executor 523 151037 34262 0 3 0x82 wait syz-executor 16874 49159 34262 0 3 0x82 nanoslp syz-executor 33424 393597 34262 0 3 0x82 nanoslp syz-executor 56492 276364 34262 0 3 0x82 nanoslp syz-executor 34262 54317 50664 0 3 0x82 kqread syz-executor 50664 361825 19244 0 3 0x10008a sigsusp ksh 19244 292676 55471 0 3 0x98 kqread sshd-session 55471 221924 8818 0 3 0x92 kqread sshd-session 12375 283875 1 0 3 0x100083 ttyin getty 8818 61609 1 0 3 0x88 kqread sshd 74327 436003 41788 74 3 0x1100092 bpf pflogd 41788 254134 1 0 3 0x80 sbwait pflogd 32483 108811 52166 73 3 0x1100090 kqread syslogd 52166 140275 1 0 3 0x100082 sbwait syslogd 64844 393982 1 0 3 0x100080 kqread resolvd 77007 363920 45102 77 3 0x100092 kqread dhcpleased 71502 278858 45102 77 3 0x100092 kqread dhcpleased 45102 128684 1 0 3 0x80 kqread dhcpleased 79294 479128 0 0 3 0x14200 bored smr 63245 266321 0 0 2 0x14200 zerothread 56638 307534 0 0 3 0x14200 aiodoned aiodoned 97696 104644 0 0 3 0x14200 syncer update 44386 130321 0 0 3 0x14200 cleaner cleaner 77896 17600 0 0 3 0x14200 reaper reaper 82654 392531 0 0 3 0x14200 pgdaemon pagedaemon 60012 162961 0 0 3 0x14200 bored viomb 27036 409469 0 0 3 0x40014200 acpi0 acpi0 30932 420250 0 0 3 0x40014200 idle1 12376 322267 0 0 3 0x14200 bored softnet1 20320 470458 0 0 3 0x14200 bored softnet0 57743 192852 0 0 3 0x14200 bored systqmp 4538 400570 0 0 3 0x14200 bored systq 58877 154158 0 0 3 0x14200 tmoslp softclockmp 29913 369579 0 0 3 0x40014200 tmoslp softclock 68180 486073 0 0 3 0x40014200 idle0 1 228903 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 87295 (ifconfig) thread 0xffff8000fffef770 (524117) exclusive rwlock maddr r = 0 (0xffff800001592878) #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_ifattach_linklocal+0x33b sys/netinet6/in6_ifattach.c:266 #6 in6_ifattach+0x2d0 sys/netinet6/in6_ifattach.c:384 #7 ifioctl+0x1b13 sys/net/if.c:2218 #8 sys_ioctl+0x674 sys/kern/sys_generic.c:-1 #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 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 ifioctl+0x1a9a sys/net/if.c:2208 #3 sys_ioctl+0x674 sys/kern/sys_generic.c:-1 #4 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #4 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #5 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (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 Process 50384 (syz-executor) thread 0xffff8000fffeefa8 (29457) exclusive rrwlock inode r = 0 (0xfffffd806c633330) #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 ufs_ihashins+0x4f ufs_ihash sys/ufs/ufs/ufs_ihash.c:-1 [inline] #4 ufs_ihashins+0x4f sys/ufs/ufs/ufs_ihash.c:159 #5 ffs_vget+0x187 sys/ufs/ffs/ffs_vfsops.c:1232 #6 ffs_inode_alloc+0x279 sys/ufs/ffs/ffs_alloc.c:393 #7 ufs_mkdir+0xfc sys/ufs/ufs/ufs_vnops.c:1112 #8 VOP_MKDIR+0x101 sys/kern/vfs_vops.c:394 #9 domkdirat+0x179 sys/kern/vfs_syscalls.c:3113 #10 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #10 syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 #11 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806d3a60d8) #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 domkdirat+0x8b sys/kern/vfs_syscalls.c:3098 #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 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11058 12105K 12113K 166960K 12150 0 pcb 18 12K 12K 166960K 22 0 rtable 225 6K 6K 166960K 335 0 pf 34 17K 18K 166960K 45 0 ifaddr 42 7K 7K 166960K 44 0 ifgroup 55 2K 2K 166960K 55 0 sysctl 1 1K 9K 166960K 5 0 counters 70 37K 37K 166960K 70 0 ioctlops 0 0K 4K 166960K 1483 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1339 84K 84K 166960K 1367 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 4 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 93K 166960K 141 0 proc 78 131K 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 in_multi 91 6K 6K 166960K 91 0 ether_multi 1 0K 0K 166960K 1 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 43 201K 201K 166960K 43 0 exec 0 0K 1K 166960K 371 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 238 176K 185K 166960K 3232 0 UVM aobj 3 2K 2K 166960K 3 0 pinsyscall 43 86K 104K 166960K 1260 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 NDP 12 0K 1K 166960K 26 0 temp 34 8666K 8730K 166960K 4032 0 kqueue 13 20K 20K 166960K 22 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 34 0 31 1 0 1 1 0 8 0 rtentry 176 105 0 1 5 0 5 5 0 8 0 unpcb 144 34 0 17 1 0 1 1 0 8 0 syncache 336 3 0 3 1 0 1 1 0 8 1 sackhl 24 1 0 1 1 1 0 1 0 8 0 tcpcb 736 8 0 4 1 0 1 1 0 8 0 arp 136 18 0 0 1 0 1 1 0 8 0 inpcb 328 71 0 62 1 0 1 1 0 8 0 nd6 152 22 0 0 1 0 1 1 0 8 0 kcovpl 48 8 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 15 0 0 1 0 1 1 0 8 0 pfstkey 128 15 0 0 1 0 1 1 0 8 0 pfstate 448 15 0 0 2 0 2 2 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 256 437 0 0 28 0 28 28 0 8 0 art_table 40 438 0 0 5 0 5 5 0 8 0 art_node 32 105 0 10 1 0 1 1 0 8 0 semapl 112 1 0 1 1 0 1 1 0 8 1 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1576 0 62 95 0 95 95 0 8 0 ffsino 296 1576 0 62 117 0 117 117 0 8 0 nchpl 144 1776 0 76 64 0 64 64 0 8 0 vnodes 216 1664 0 0 93 0 93 93 0 8 0 namei 1024 5305 0 5304 1 0 1 1 0 8 0 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 5970 0 5969 3 1 2 2 1 8 1 plimitpl 152 27 0 10 1 0 1 1 0 8 0 sigapl 424 449 0 401 7 0 7 7 0 8 0 knotepl 120 55 0 0 2 0 2 2 0 8 0 kqueuepl 224 18 0 9 1 0 1 1 0 8 0 pipepl 344 118 0 91 3 0 3 3 0 8 0 fdescpl 528 433 0 401 3 0 3 3 0 8 0 filepl 160 1521 0 1306 10 0 10 10 0 8 0 lockfpl 104 6 0 4 1 0 1 1 0 8 0 lockfspl 48 4 0 2 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 85 0 71 1 0 1 1 0 8 0 zombiepl 144 402 0 401 1 0 1 1 0 8 0 processpl 1232 449 0 401 5 0 5 5 0 8 1 procpl 664 469 0 413 6 0 6 6 0 8 1 sockpl 752 139 0 110 4 0 4 4 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 119 0 0 15 0 15 15 0 8 0 mcl2k 2048 30 0 0 4 0 4 4 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 190 0 0 12 0 12 12 0 8 0 bufpl 280 2384 0 130 161 0 161 161 0 8 0 anonpl 32 3912 0 0 32 0 32 32 0 246 0 amapchunkpl 152 8945 0 8473 20 0 20 20 0 158 0 amappl16 200 1923 0 1906 5 0 5 5 0 8 4 amappl15 192 66 0 66 1 1 0 1 0 8 0 amappl14 184 4 0 4 1 1 0 1 0 8 0 amappl13 176 421 0 418 1 0 1 1 0 8 0 amappl12 168 786 0 744 3 0 3 3 0 8 0 amappl11 160 24 0 24 1 1 0 1 0 8 0 amappl10 152 63 0 49 1 0 1 1 0 8 0 amappl9 144 251 0 250 1 0 1 1 0 8 0 amappl8 136 31 0 29 1 0 1 1 0 8 0 amappl7 128 119 0 117 1 0 1 1 0 8 0 amappl6 120 274 0 259 1 0 1 1 0 8 0 amappl5 112 76 0 66 1 0 1 1 0 8 0 amappl4 104 426 0 397 1 0 1 1 0 8 0 amappl3 96 1325 0 1237 4 1 3 3 0 8 0 amappl2 88 544 0 471 2 0 2 2 0 8 0 amappl1 80 9007 0 8414 14 0 14 14 0 8 0 amappl 88 2511 0 2353 4 0 4 4 0 92 0 uvmvnodes 80 98 0 0 2 0 2 2 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 2 0 0 1 0 1 1 0 8 0 uaddrrnd 24 433 0 401 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 433 0 401 1 0 1 1 0 8 0 vmmpekpl 168 5338 0 5306 2 0 2 2 0 8 0 vmmpepl 168 35890 0 34027 86 0 86 86 0 357 2 vmsppl 488 432 0 401 5 0 5 5 0 8 0 rwobjpl 80 13407 0 12401 24 1 23 24 0 8 1 pdppl 4096 874 0 802 98 20 78 86 0 8 6 pvpl 32 9813 0 0 80 0 80 80 0 265 0 pmappl 256 432 0 401 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 268 0 22 8 0 8 8 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(ffffffff833b4a35) at panic+0x1e5 sys/kern/subr_prf.c:198 witness_checkorder(ffff800001592878,1,0) at witness_checkorder+0x122c sys/kern/subr_witness.c:854 rw_do_enter_read(ffff800001592860,0) at rw_do_enter_read+0x99 sys/kern/kern_rwlock.c:355 in6_hasmulti(fffffd807ea87df0,ffff800001592800) at in6_hasmulti+0x41 in6_lookupmulti sys/netinet6/in6.c:-1 [inline] in6_hasmulti(fffffd807ea87df0,ffff800001592800) at in6_hasmulti+0x41 sys/netinet6/in6.c:1150 ip6_output(fffffd807ea87d00,ffffffff839eee58,0,1,ffff8000347d1260,0) at ip6_output+0x13bd sys/netinet6/ip6_output.c:507 mld6_sendpkt(ffff8000015b7780,83,0) at mld6_sendpkt+0x385 sys/netinet6/mld6.c:499 mld6_start_listening(ffff8000015b7780,ffff800001592800) at mld6_start_listening+0xe7 sys/netinet6/mld6.c:139 in6_addmulti(ffff8000347d1608,ffff800001592800,ffff8000347d167c) at in6_addmulti+0x3d7 sys/netinet6/in6.c:1084 in6_joingroup(ffff800001592800,ffff8000347d1608,ffff8000347d167c) at in6_joingroup+0x6c sys/netinet6/in6.c:-1 in6_update_ifa(ffff800001592800,ffff8000347d1700,0) at in6_update_ifa+0x1a86 sys/netinet6/in6.c:-1 in6_ifattach_linklocal(ffff800001592800,0) at in6_ifattach_linklocal+0x33b sys/netinet6/in6_ifattach.c:266 in6_ifattach(ffff800001592800) at in6_ifattach+0x2d0 sys/netinet6/in6_ifattach.c:384 ifioctl(ffff8000015afa88,801169ab,ffff8000347d18f0,ffff8000fffef770) at ifioctl+0x1b13 sys/net/if.c:2218 sys_ioctl(ffff8000fffef770,ffff8000347d1ad0,ffff8000347d1a20) at sys_ioctl+0x674 sys/kern/sys_generic.c:-1 syscall(ffff8000347d1ad0) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff8000347d1ad0) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x780cf7256600, count: -17 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffff8000299ddff0) 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 syscall(ffff80002fbc5460) at syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline] syscall(ffff80002fbc5460) at syscall+0xaf4 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x73e544521c60, count: 9 ddb{1}> trace x86_ipi_db(ffff8000299ddff0) 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 syscall(ffff80002fbc5460) at syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline] syscall(ffff80002fbc5460) at syscall+0xaf4 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x73e544521c60, count: -6