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 * 69285 61319 0 0x2 0 0K ifconfig 168223 97685 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(ffff8000015a9878,1,0) at witness_checkorder+0x122c sys/kern/subr_witness.c:854 rw_do_enter_read(ffff8000015a9860,0) at rw_do_enter_read+0x99 sys/kern/kern_rwlock.c:355 in6_hasmulti(fffffd806c41ebf0,ffff8000015a9800) at in6_hasmulti+0x41 in6_lookupmulti sys/netinet6/in6.c:-1 [inline] in6_hasmulti(fffffd806c41ebf0,ffff8000015a9800) at in6_hasmulti+0x41 sys/netinet6/in6.c:1150 ip6_output(fffffd806c41eb00,ffffffff839eee58,0,1,ffff8000347e0390,0) at ip6_output+0x13bd sys/netinet6/ip6_output.c:507 mld6_sendpkt(ffff800001606980,83,0) at mld6_sendpkt+0x385 sys/netinet6/mld6.c:499 mld6_start_listening(ffff800001606980,ffff8000015a9800) at mld6_start_listening+0xe7 sys/netinet6/mld6.c:139 in6_addmulti(ffff8000347e0738,ffff8000015a9800,ffff8000347e07ac) at in6_addmulti+0x3d7 sys/netinet6/in6.c:1084 in6_joingroup(ffff8000015a9800,ffff8000347e0738,ffff8000347e07ac) at in6_joingroup+0x6c sys/netinet6/in6.c:-1 in6_update_ifa(ffff8000015a9800,ffff8000347e0830,0) at in6_update_ifa+0x1a86 sys/netinet6/in6.c:-1 in6_ifattach_linklocal(ffff8000015a9800,0) at in6_ifattach_linklocal+0x33b sys/netinet6/in6_ifattach.c:266 in6_ifattach(ffff8000015a9800) at in6_ifattach+0x2d0 sys/netinet6/in6_ifattach.c:384 ifioctl(ffff800001634c48,801169ab,ffff8000347e0a20,ffff80003c4b0030) at ifioctl+0x1b13 sys/net/if.c:2218 end trace frame: 0xffff8000347e0b20, 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(ffff8000015a9878,1,0) at witness_checkorder+0x122c sys/kern/subr_witness.c:854 rw_do_enter_read(ffff8000015a9860,0) at rw_do_enter_read+0x99 sys/kern/kern_rwlock.c:355 in6_hasmulti(fffffd806c41ebf0,ffff8000015a9800) at in6_hasmulti+0x41 in6_lookupmulti sys/netinet6/in6.c:-1 [inline] in6_hasmulti(fffffd806c41ebf0,ffff8000015a9800) at in6_hasmulti+0x41 sys/netinet6/in6.c:1150 ip6_output(fffffd806c41eb00,ffffffff839eee58,0,1,ffff8000347e0390,0) at ip6_output+0x13bd sys/netinet6/ip6_output.c:507 mld6_sendpkt(ffff800001606980,83,0) at mld6_sendpkt+0x385 sys/netinet6/mld6.c:499 mld6_start_listening(ffff800001606980,ffff8000015a9800) at mld6_start_listening+0xe7 sys/netinet6/mld6.c:139 in6_addmulti(ffff8000347e0738,ffff8000015a9800,ffff8000347e07ac) at in6_addmulti+0x3d7 sys/netinet6/in6.c:1084 in6_joingroup(ffff8000015a9800,ffff8000347e0738,ffff8000347e07ac) at in6_joingroup+0x6c sys/netinet6/in6.c:-1 in6_update_ifa(ffff8000015a9800,ffff8000347e0830,0) at in6_update_ifa+0x1a86 sys/netinet6/in6.c:-1 in6_ifattach_linklocal(ffff8000015a9800,0) at in6_ifattach_linklocal+0x33b sys/netinet6/in6_ifattach.c:266 in6_ifattach(ffff8000015a9800) at in6_ifattach+0x2d0 sys/netinet6/in6_ifattach.c:384 ifioctl(ffff800001634c48,801169ab,ffff8000347e0a20,ffff80003c4b0030) at ifioctl+0x1b13 sys/net/if.c:2218 sys_ioctl(ffff80003c4b0030,ffff8000347e0c00,ffff8000347e0b50) at sys_ioctl+0x674 sys/kern/sys_generic.c:-1 syscall(ffff8000347e0c00) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff8000347e0c00) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7a3a30dce430, count: -17 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff8000347dffe0 rbx 0xffffffff837e4e07 cpu_info_full_primary+0x2e07 rdx 0 rcx 0xffff80003c4b0030 rax 0xffffffff837e3ff0 cpu_info_full_primary+0x1ff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0xe6239828fb6b3b7c r11 0xf8d0f0d5357943bc r12 0xffffffff837e4c08 cpu_info_full_primary+0x2c08 r13 0 r14 0 r15 0x1 rip 0xffffffff810e0165 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff8000347dffd0 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (ifconfig) tid=69285 pid=61319 tcnt=1 stat=onproc flags process=2 proc=0 runpri=50, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003c4b0d28,0xffffffff8393dc18 process=0xffff8000fffde6b0 user=0xffff8000347db000, vmspace=0xfffffd805fc16b98 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND *61319 69285 40143 0 7 0x2 ifconfig 40143 170725 7743 0 3 0x10008a sigsusp sh 99729 39883 27237 0 2 0 syz-executor 76037 366869 51837 0 2 0x10 syz-executor 76037 246267 51837 0 3 0x4000090 fsleep syz-executor 97685 168223 42871 0 7 0 syz-executor 97685 49465 42871 0 3 0x4000080 nanoslp syz-executor 7743 423988 62998 0 3 0x82 wait syz-executor 48695 148007 0 0 3 0x14200 acct acct 3795 433396 0 0 3 0x14280 nfsidl nfsio 16988 145490 0 0 3 0x14280 nfsidl nfsio 60715 443109 0 0 3 0x14280 nfsidl nfsio 2144 238937 0 0 3 0x14280 nfsidl nfsio 70462 36313 0 0 3 0x14280 nfsidl nfsio 41114 249406 0 0 3 0x14280 nfsidl nfsio 80026 79222 0 0 3 0x14280 nfsidl nfsio 397 139243 0 0 3 0x14280 nfsidl nfsio 30840 364199 0 0 3 0x14280 nfsidl nfsio 51759 319536 0 0 3 0x14280 nfsidl nfsio 8917 458008 0 0 3 0x14280 nfsidl nfsio 13299 268446 0 0 3 0x14280 nfsidl nfsio 98687 504902 0 0 3 0x14280 nfsidl nfsio 35611 164745 0 0 3 0x14280 nfsidl nfsio 74756 257248 0 0 3 0x14280 nfsidl nfsio 41992 490145 0 0 3 0x14280 nfsidl nfsio 77694 250991 0 0 3 0x14280 nfsidl nfsio 77685 454847 0 0 3 0x14280 nfsidl nfsio 23797 275810 0 0 3 0x14280 nfsidl nfsio 55847 463858 0 0 3 0x14280 nfsidl nfsio 94812 317657 62998 0 3 0x82 wait syz-executor 24809 469614 62998 0 3 0x82 piperd syz-executor 88434 347409 62998 0 3 0x82 piperd syz-executor 51837 9175 62998 0 3 0x82 nanoslp syz-executor 27237 88231 62998 0 3 0x82 nanoslp syz-executor 62389 345387 62998 0 3 0x82 piperd syz-executor 42871 209701 62998 0 3 0x82 nanoslp syz-executor 62998 207942 50284 0 2 0x2 syz-executor 50284 122877 73695 0 3 0x10008a sigsusp ksh 73695 49156 31028 0 3 0x98 kqread sshd-session 31028 156618 77069 0 3 0x92 kqread sshd-session 59282 153301 1 0 3 0x100083 ttyin getty 77069 464565 1 0 3 0x88 kqread sshd 25735 451286 3549 74 3 0x1100092 bpf pflogd 3549 253003 1 0 3 0x80 sbwait pflogd 83139 361179 58463 73 3 0x1100090 kqread syslogd 58463 227112 1 0 3 0x100082 sbwait syslogd 29954 131340 1 0 3 0x100080 kqread resolvd 68403 28802 8717 77 3 0x100092 kqread dhcpleased 48740 297040 8717 77 3 0x100092 kqread dhcpleased 8717 240494 1 0 3 0x80 kqread dhcpleased 89040 450507 0 0 3 0x14200 bored smr 33427 451919 0 0 2 0x14200 zerothread 95529 302530 0 0 3 0x14200 aiodoned aiodoned 36372 338523 0 0 3 0x14200 syncer update 99560 317139 0 0 3 0x14200 cleaner cleaner 80665 332894 0 0 3 0x14200 reaper reaper 90958 502279 0 0 3 0x14200 pgdaemon pagedaemon 92140 304395 0 0 3 0x14200 bored viomb 87735 79215 0 0 3 0x40014200 acpi0 acpi0 15964 282037 0 0 3 0x40014200 idle1 81343 58031 0 0 3 0x14200 bored softnet1 59496 430288 0 0 3 0x14200 bored softnet0 86090 94403 0 0 3 0x14200 bored systqmp 75491 350522 0 0 3 0x14200 bored systq 22096 145662 0 0 3 0x14200 tmoslp softclockmp 26880 295703 0 0 3 0x40014200 tmoslp softclock 82848 456727 0 0 3 0x40014200 idle0 1 430894 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 61319 (ifconfig) thread 0xffff80003c4b0030 (69285) exclusive rwlock maddr r = 0 (0xffff8000015a9878) #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 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11097 12107K 13540K 166960K 13388 0 pcb 18 14K 17K 166960K 260 0 rtable 240 11K 11K 166960K 483 0 pf 37 18K 81K 166960K 117 0 ifaddr 43 7K 8K 166960K 84 0 ifgroup 59 2K 2K 166960K 130 0 sysctl 3 1K 9K 166960K 11 0 counters 72 37K 38K 166960K 164 0 ioctlops 0 0K 4K 166960K 1774 0 iov 0 0K 24K 166960K 35 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1456 92K 92K 166960K 2112 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 123 0 dirhash 12 2K 2K 166960K 18 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 16 57K 236K 166960K 882 0 sigio 0 0K 0K 166960K 21 0 proc 79 131K 164K 166960K 638 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 234 0 in_multi 91 6K 7K 166960K 144 0 ether_multi 1 0K 0K 166960K 12 0 mrt 2 0K 0K 166960K 7 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 229 1023K 1023K 166960K 229 0 exec 0 0K 1K 166960K 503 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 216 159K 173K 166960K 9488 0 UVM aobj 21 6K 8K 166960K 25 0 pinsyscall 41 82K 100K 166960K 2057 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 39 0 NDP 13 0K 2K 166960K 56 0 temp 80 8680K 8750K 166960K 43742 0 kqueue 13 20K 29K 166960K 180 0 SYN cache 2 8K 16K 166960K 3 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 120 128 0 125 2 0 2 2 0 8 1 rtentry 176 133 0 34 6 0 6 6 0 8 0 unpcb 144 422 0 405 2 1 1 2 0 8 0 syncache 336 7 0 7 3 2 1 1 0 8 1 tcpqe 32 3 0 3 2 1 1 1 0 8 1 tcpcb 736 163 0 156 2 1 1 2 0 8 0 arp 136 22 0 4 1 0 1 1 0 8 0 inpcb 328 896 0 884 14 7 7 7 0 8 5 nd6 152 26 0 3 1 0 1 1 0 8 0 pkpcb 40 7 0 7 2 1 1 1 0 8 1 kcovpl 48 9 0 1 1 0 1 1 0 8 0 ppxss 1192 38 0 38 1 0 1 1 0 8 1 pppxif 1576 4 0 4 2 1 1 1 0 8 1 pfstscr 40 1 0 1 1 0 1 1 0 8 1 pffrag 232 25 0 17 1 0 1 1 0 482 0 pffrnode 88 6 0 1 1 0 1 1 0 8 0 pffrent 40 45 0 37 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 pftag 88 1 0 0 1 0 1 1 0 8 0 pfstitem 24 51 0 22 1 0 1 1 0 8 0 pfstkey 128 53 0 24 2 0 2 2 0 8 0 pfstate 448 52 0 23 4 0 4 4 0 8 0 pfrule 1344 26 0 20 2 0 2 2 0 8 0 rttmr 136 1 0 0 1 0 1 1 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 533 0 103 31 1 30 31 0 8 0 art_table 40 535 0 103 5 0 5 5 0 8 0 art_node 32 132 0 42 1 0 1 1 0 8 0 sysvmsgpl 40 9 0 5 1 0 1 1 0 8 0 semapl 112 121 0 111 1 0 1 1 0 8 0 shmpl 112 18 0 2 1 0 1 1 0 8 0 dirhash 1024 21 0 4 3 0 3 3 0 8 0 dino2pl 256 2896 0 1395 96 0 96 96 0 8 0 ffsino 296 2896 0 1395 117 0 117 117 0 8 0 nchpl 144 4196 0 2498 64 0 64 64 0 8 0 rtmask 32 11 0 11 2 1 1 1 0 8 1 vnodes 216 3483 0 0 194 0 194 194 0 8 0 namei 1024 13723 0 13723 2 1 1 2 0 8 1 percpumem 16 97 0 46 1 0 1 1 0 8 0 vcpupl 3968 2 0 0 1 0 1 1 0 8 0 vmpool 848 4 0 2 1 0 1 1 0 8 0 kstatmem 264 82 0 52 4 1 3 3 0 8 0 scsiplug 72 2 0 2 2 2 0 1 0 8 0 scxspl 216 21453 0 21453 10 9 1 8 1 8 1 plimitpl 152 387 0 370 1 0 1 1 0 8 0 sigapl 424 1203 0 1136 8 0 8 8 0 8 0 knotepl 120 557 0 0 17 0 17 17 0 8 0 kqueuepl 224 285 0 276 2 0 2 2 0 8 1 pipepl 344 259 0 232 9 6 3 9 0 8 0 fdescpl 528 1166 0 1136 3 0 3 3 0 8 0 filepl 160 6758 0 6545 17 3 14 16 0 8 4 lockfpl 104 272 0 270 1 0 1 1 0 8 0 lockfspl 48 113 0 111 1 0 1 1 0 8 0 sessionpl 144 25 0 16 1 0 1 1 0 8 0 pgrppl 48 86 0 69 1 0 1 1 0 8 0 ucredpl 104 840 0 826 1 0 1 1 0 8 0 zombiepl 144 1137 0 1136 1 0 1 1 0 8 0 processpl 1232 1203 0 1136 7 1 6 6 0 8 0 procpl 664 2374 0 2305 8 0 8 8 0 8 1 sosppl 176 12 0 12 3 2 1 1 0 8 1 sockpl 752 1535 0 1503 18 8 10 11 0 8 5 mcl64k 65536 9 0 0 2 0 2 2 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 4 0 0 1 0 1 1 0 8 0 mcl4k 4096 114 0 0 15 0 15 15 0 8 0 mcl2k 2048 40 0 0 5 0 5 5 0 8 0 mtagpl 96 33 0 0 1 0 1 1 0 8 0 mbufpl 256 244 0 0 16 0 16 16 0 8 0 bufpl 280 8247 0 2111 439 0 439 439 0 8 0 anonpl 32 9684 0 0 78 0 78 78 0 246 0 amapchunkpl 152 30681 0 30286 34 8 26 28 0 158 6 amappl16 200 5049 0 5018 34 20 14 22 0 8 8 amappl15 192 4 0 4 1 1 0 1 0 8 0 amappl14 184 10 0 10 1 1 0 1 0 8 0 amappl13 176 449 0 447 1 0 1 1 0 8 0 amappl12 168 1544 0 1504 3 0 3 3 0 8 0 amappl11 160 7 0 7 2 2 0 1 0 8 0 amappl10 152 48 0 34 1 0 1 1 0 8 0 amappl9 144 247 0 246 1 0 1 1 0 8 0 amappl8 136 32 0 29 1 0 1 1 0 8 0 amappl7 128 88 0 86 1 0 1 1 0 8 0 amappl6 120 295 0 279 1 0 1 1 0 8 0 amappl5 112 78 0 67 1 0 1 1 0 8 0 amappl4 104 436 0 407 1 0 1 1 0 8 0 amappl3 96 5426 0 5350 4 1 3 3 0 8 0 amappl2 88 1295 0 1221 2 0 2 2 0 8 0 amappl1 80 12727 0 12131 14 0 14 14 0 8 0 amappl 88 8596 0 8458 5 0 5 5 0 92 0 uvmvnodes 80 124 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 8 0 8 2 2 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 18 0 17 1 0 1 1 0 8 0 aobjpl 72 24 0 4 1 0 1 1 0 8 0 uaddrrnd 24 1166 0 1136 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1166 0 1136 1 0 1 1 0 8 0 vmmpekpl 168 11012 0 10967 3 0 3 3 0 8 0 vmmpepl 168 81094 0 79310 103 4 99 102 0 357 5 vmsppl 488 1165 0 1136 6 1 5 5 0 8 0 rwobjpl 80 24706 0 23645 32 3 29 30 0 8 0 pdppl 4096 2348 0 2278 107 31 76 82 0 8 6 pvpl 32 17905 0 0 147 2 145 145 0 265 0 pmappl 256 1169 0 1138 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 297 0 39 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(ffff8000015a9878,1,0) at witness_checkorder+0x122c sys/kern/subr_witness.c:854 rw_do_enter_read(ffff8000015a9860,0) at rw_do_enter_read+0x99 sys/kern/kern_rwlock.c:355 in6_hasmulti(fffffd806c41ebf0,ffff8000015a9800) at in6_hasmulti+0x41 in6_lookupmulti sys/netinet6/in6.c:-1 [inline] in6_hasmulti(fffffd806c41ebf0,ffff8000015a9800) at in6_hasmulti+0x41 sys/netinet6/in6.c:1150 ip6_output(fffffd806c41eb00,ffffffff839eee58,0,1,ffff8000347e0390,0) at ip6_output+0x13bd sys/netinet6/ip6_output.c:507 mld6_sendpkt(ffff800001606980,83,0) at mld6_sendpkt+0x385 sys/netinet6/mld6.c:499 mld6_start_listening(ffff800001606980,ffff8000015a9800) at mld6_start_listening+0xe7 sys/netinet6/mld6.c:139 in6_addmulti(ffff8000347e0738,ffff8000015a9800,ffff8000347e07ac) at in6_addmulti+0x3d7 sys/netinet6/in6.c:1084 in6_joingroup(ffff8000015a9800,ffff8000347e0738,ffff8000347e07ac) at in6_joingroup+0x6c sys/netinet6/in6.c:-1 in6_update_ifa(ffff8000015a9800,ffff8000347e0830,0) at in6_update_ifa+0x1a86 sys/netinet6/in6.c:-1 in6_ifattach_linklocal(ffff8000015a9800,0) at in6_ifattach_linklocal+0x33b sys/netinet6/in6_ifattach.c:266 in6_ifattach(ffff8000015a9800) at in6_ifattach+0x2d0 sys/netinet6/in6_ifattach.c:384 ifioctl(ffff800001634c48,801169ab,ffff8000347e0a20,ffff80003c4b0030) at ifioctl+0x1b13 sys/net/if.c:2218 sys_ioctl(ffff80003c4b0030,ffff8000347e0c00,ffff8000347e0b50) at sys_ioctl+0x674 sys/kern/sys_generic.c:-1 syscall(ffff8000347e0c00) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff8000347e0c00) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7a3a30dce430, 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 end of kernel end trace frame: 0x76067a8fb9d0, count: 12 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 end of kernel end trace frame: 0x76067a8fb9d0, count: -3