login: 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 371271 51103 0 0 0x4000000 1 syz-executor *468342 93919 0 0x14000 0x200 0 softnet0 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(fffffd806d300ff0,ffff800000c31000) at in6_hasmulti+0x41 in6_lookupmulti sys/netinet6/in6.c:-1 [inline] in6_hasmulti(fffffd806d300ff0,ffff800000c31000) at in6_hasmulti+0x41 sys/netinet6/in6.c:1150 ip6_output(fffffd806d300f00,ffffffff839eee58,0,0,ffff80002a2109d0,0) at ip6_output+0x13bd sys/netinet6/ip6_output.c:507 mld6_sendpkt(ffff8000015c8080,84,ffff80002a210a68) at mld6_sendpkt+0x385 sys/netinet6/mld6.c:499 mld6_stop_listening(ffff8000015c8080,ffff800000c31000) at mld6_stop_listening+0x125 sys/netinet6/mld6.c:168 in6_delmulti(ffff8000015c8080) at in6_delmulti+0xb1 sys/netinet6/in6.c:1118 in6_purgeaddr(ffff80000159c400) at in6_purgeaddr+0x1d5 in6_leavegroup sys/netinet6/in6.c:1181 [inline] in6_purgeaddr(ffff80000159c400) at in6_purgeaddr+0x1d5 sys/netinet6/in6.c:916 nd6_expire(0) at nd6_expire+0x111 sys/netinet6/nd6.c:-1 taskq_thread(ffff80000002c000) at taskq_thread+0x157 sys/kern/kern_task.c:446 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{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(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(fffffd806d300ff0,ffff800000c31000) at in6_hasmulti+0x41 in6_lookupmulti sys/netinet6/in6.c:-1 [inline] in6_hasmulti(fffffd806d300ff0,ffff800000c31000) at in6_hasmulti+0x41 sys/netinet6/in6.c:1150 ip6_output(fffffd806d300f00,ffffffff839eee58,0,0,ffff80002a2109d0,0) at ip6_output+0x13bd sys/netinet6/ip6_output.c:507 mld6_sendpkt(ffff8000015c8080,84,ffff80002a210a68) at mld6_sendpkt+0x385 sys/netinet6/mld6.c:499 mld6_stop_listening(ffff8000015c8080,ffff800000c31000) at mld6_stop_listening+0x125 sys/netinet6/mld6.c:168 in6_delmulti(ffff8000015c8080) at in6_delmulti+0xb1 sys/netinet6/in6.c:1118 in6_purgeaddr(ffff80000159c400) at in6_purgeaddr+0x1d5 in6_leavegroup sys/netinet6/in6.c:1181 [inline] in6_purgeaddr(ffff80000159c400) at in6_purgeaddr+0x1d5 sys/netinet6/in6.c:916 nd6_expire(0) at nd6_expire+0x111 sys/netinet6/nd6.c:-1 taskq_thread(ffff80000002c000) at taskq_thread+0x157 sys/kern/kern_task.c:446 end trace frame: 0x0, count: -12 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff80002a210620 rbx 0xffffffff837e4e07 cpu_info_full_primary+0x2e07 rdx 0 rcx 0xffff8000ffffecf8 rax 0xffffffff837e3ff0 cpu_info_full_primary+0x1ff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x58cd73f75144fcf2 r11 0x52ebaffc4b5e40fa r12 0xffffffff837e4c08 cpu_info_full_primary+0x2c08 r13 0 r14 0 r15 0x1 rip 0xffffffff810e0165 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80002a210610 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (softnet0) tid=468342 pid=93919 tcnt=1 stat=onproc flags process=14000 proc=200 runpri=32, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000ffffe7c8,0xffff8000ffffefa0 process=0xffff8000ffff8000 user=0xffff80002a20b000, vmspace=0xffffffff83a0c438 estcpu=0, cpticks=4, pctcpu=0.0, user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 72975 480754 99846 0 2 0 syz-executor 72975 106205 99846 0 3 0x4000080 fsleep syz-executor 67124 154216 29921 0 2 0 syz-executor 67124 435857 29921 0 3 0x4000080 fsleep syz-executor 67124 409737 29921 0 3 0x4000080 fsleep syz-executor 92384 50432 47498 0 2 0 syz-executor 92384 148391 47498 0 2 0x4000000 syz-executor 92384 406398 47498 0 2 0x4000000 syz-executor 51103 70768 96391 0 2 0 syz-executor 51103 371271 96391 0 7 0x4000000 syz-executor 85343 347180 19060 0 3 0x80 nanoslp syz-executor 85343 139171 19060 0 3 0x4000080 msgwait syz-executor 85343 29782 19060 0 3 0x4000080 fsleep syz-executor 52934 49587 45671 0 2 0xc80 syz-executor 52934 13623 45671 0 3 0x4000080 msgwait syz-executor 52934 86901 45671 0 3 0x4000080 fsleep syz-executor 70000 158862 52545 0 2 0xc80 syz-executor 70000 433713 52545 0 3 0x4000080 pipewr syz-executor 70000 159922 52545 0 3 0x4000080 fsleep syz-executor 90875 9299 3603 0 3 0x3000 suspend syz-executor 90875 254974 3603 0 2 0x4081000 syz-executor 90875 357447 3603 0 3 0x4081000 fltagain2 syz-executor 90875 24290 3603 0 3 0x4081000 pipecl syz-executor 90875 246842 3603 0 3 0x4081000 inode syz-executor 81245 347334 1 0 3 0x100083 ttyin getty 19060 265315 16957 0 3 0x82 nanoslp syz-executor 45671 168563 16957 0 2 0xc82 syz-executor 29921 225194 16957 0 3 0x82 nanoslp syz-executor 3603 63811 16957 0 2 0xc82 syz-executor 99846 32328 16957 0 3 0x82 nanoslp syz-executor 96391 80306 16957 0 3 0x82 nanoslp syz-executor 47498 251564 16957 0 2 0xc82 syz-executor 52545 408884 16957 0 2 0xc82 syz-executor 16957 151010 36986 0 3 0x82 kqread syz-executor 36986 292692 54891 0 3 0x10008a sigsusp ksh 54891 66565 24291 0 3 0x98 kqread sshd-session 24291 93337 82467 0 3 0x92 kqread sshd-session 82467 52418 1 0 3 0x88 kqread sshd 13300 338639 93128 74 3 0x1100092 bpf pflogd 93128 21119 1 0 3 0x80 sbwait pflogd 66508 518146 71933 73 3 0x1100090 kqread syslogd 71933 445831 1 0 3 0x100082 sbwait syslogd 70619 142685 1 0 3 0x100080 kqread resolvd 85100 76500 70847 77 3 0x100092 kqread dhcpleased 52029 156354 70847 77 3 0x100092 kqread dhcpleased 70847 216975 1 0 3 0x80 kqread dhcpleased 95053 317096 0 0 3 0x14200 bored smr 14411 120997 0 0 2 0x14200 zerothread 20036 13503 0 0 3 0x14200 aiodoned aiodoned 89747 313934 0 0 2 0x14e00 update 64387 121165 0 0 3 0x14200 cleaner cleaner 7180 225909 0 0 3 0x14200 reaper reaper 78659 339828 0 0 3 0x14200 pgdaemon pagedaemon 70043 218342 0 0 3 0x14200 bored viomb 92121 366823 0 0 3 0x40014200 acpi0 acpi0 69255 48664 0 0 3 0x40014200 idle1 65171 270131 0 0 3 0x14200 bored softnet1 *93919 468342 0 0 7 0x14200 softnet0 45907 504604 0 0 2 0x14200 systqmp 46291 523423 0 0 3 0x14200 bored systq 14263 15802 0 0 3 0x14200 tmoslp softclockmp 95973 148405 0 0 3 0x40014200 tmoslp softclock 42802 395687 0 0 3 0x40014200 idle0 1 295152 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 90875 (syz-executor) thread 0xffff8000fffead18 (254974) exclusive rrwlock inode r = 0 (0xfffffd806c6beb48) #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 90875 (syz-executor) thread 0xffff80002a28ba08 (246842) exclusive rrwlock inode r = 0 (0xfffffd806fe0a1e0) #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 domknodat+0xb4 sys/kern/vfs_syscalls.c:1592 #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 93919 (softnet0) thread 0xffff8000ffffecf8 (468342) 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_delmulti+0x9d sys/netinet6/in6.c:1116 #3 in6_purgeaddr+0x1d5 in6_leavegroup sys/netinet6/in6.c:1181 [inline] #3 in6_purgeaddr+0x1d5 sys/netinet6/in6.c:916 #4 nd6_expire+0x111 sys/netinet6/nd6.c:-1 #5 taskq_thread+0x157 sys/kern/kern_task.c:446 #6 proc_trampoline+0x10 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 nd6_expire+0x2e sys/netinet6/nd6.c:467 #3 taskq_thread+0x157 sys/kern/kern_task.c:446 #4 proc_trampoline+0x10 shared rwlock softnet0 r = 0 (0xffff80000002c078) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 taskq_thread+0x12a sys/kern/kern_task.c:442 #2 proc_trampoline+0x10 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11094 12278K 12411K 166960K 12358 0 pcb 18 12K 12K 166960K 39 0 rtable 213 6K 7K 166960K 376 0 pf 33 17K 18K 166960K 51 0 ifaddr 40 7K 8K 166960K 49 0 ifgroup 51 2K 2K 166960K 59 0 sysctl 1 1K 9K 166960K 6 0 counters 68 36K 37K 166960K 74 0 ioctlops 0 0K 4K 166960K 1497 0 iov 0 0K 12K 166960K 4 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1343 84K 85K 166960K 1438 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 6 0K 0K 166960K 7 0 dirhash 12 2K 2K 166960K 21 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 232K 166960K 273 0 sigio 1 0K 0K 166960K 1 0 proc 72 115K 164K 166960K 541 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 18 0 in_multi 89 6K 7K 166960K 113 0 ether_multi 2 0K 0K 166960K 3 0 mrt 2 0K 0K 166960K 2 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 223 996K 996K 166960K 223 0 exec 0 0K 1K 166960K 389 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 269 177K 180K 166960K 4024 0 UVM aobj 37 2K 2K 166960K 37 0 pinsyscall 43 86K 102K 166960K 1380 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 2 0 NDP 11 0K 2K 166960K 31 0 temp 44 8667K 8733K 166960K 6333 0 kqueue 15 21K 28K 166960K 47 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 43 0 40 1 0 1 1 0 8 0 rtentry 176 113 0 18 6 0 6 6 0 8 0 unpcb 144 87 0 67 2 0 2 2 0 8 1 syncache 336 4 0 4 1 0 1 1 0 8 1 tcpqe 32 2 0 2 1 0 1 1 0 8 1 tcpcb 736 33 0 28 1 0 1 1 0 8 0 arp 136 18 0 4 1 0 1 1 0 8 0 inpcb 328 151 0 140 2 0 2 2 0 8 0 nd6 152 24 0 3 1 0 1 1 0 8 0 pkpcb 40 1 0 1 1 0 1 1 0 8 1 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1192 2 0 2 1 0 1 1 0 8 1 pfstscr 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 21 0 0 1 0 1 1 0 8 0 pfstkey 128 21 0 0 1 0 1 1 0 8 0 pfstate 448 20 0 0 3 0 3 3 0 8 0 pfrule 1344 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 458 0 54 29 0 29 29 0 8 2 art_table 40 460 0 54 5 0 5 5 0 8 0 art_node 32 113 0 28 1 0 1 1 0 8 0 sysvmsgpl 40 1 0 1 1 0 1 1 0 8 1 semupl 112 2 0 2 1 0 1 1 0 8 1 semapl 112 5 0 1 1 0 1 1 0 8 0 shmpl 112 34 0 0 1 0 1 1 0 8 0 dirhash 1024 23 0 6 3 0 3 3 0 8 0 dino2pl 256 1769 0 252 96 0 96 96 0 8 0 ffsino 296 1769 0 252 118 0 118 118 0 8 0 nchpl 144 2169 0 461 64 0 64 64 0 8 0 vnodes 216 1902 0 0 106 0 106 106 0 8 0 namei 1024 7061 0 7060 1 0 1 1 0 8 0 percpumem 16 52 0 3 1 0 1 1 0 8 0 kstatmem 264 30 0 6 2 0 2 2 0 8 0 scsiplug 72 1 0 1 1 0 1 1 0 8 1 scxspl 216 8418 0 8418 3 1 2 2 1 8 2 plimitpl 152 78 0 58 1 0 1 1 0 8 0 sigapl 424 557 0 509 7 0 7 7 0 8 1 knotepl 120 514 0 0 16 0 16 16 0 8 0 kqueuepl 224 122 0 111 5 0 5 5 0 8 4 pipepl 344 128 0 98 3 0 3 3 0 8 0 fdescpl 528 541 0 509 3 0 3 3 0 8 0 filepl 160 2612 0 2309 15 0 15 15 0 8 2 lockfpl 104 55 0 51 1 0 1 1 0 8 0 lockfspl 48 25 0 22 1 0 1 1 0 8 0 sessionpl 144 24 0 15 1 0 1 1 0 8 0 pgrppl 48 32 0 15 1 0 1 1 0 8 0 ucredpl 104 407 0 394 1 0 1 1 0 8 0 zombiepl 144 510 0 509 1 0 1 1 0 8 0 processpl 1232 557 0 509 5 0 5 5 0 8 0 procpl 664 771 0 707 6 0 6 6 0 8 0 sockpl 752 284 0 250 5 0 5 5 0 8 1 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 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 120 0 0 15 0 15 15 0 8 0 mcl2k 2048 31 0 0 4 0 4 4 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 203 0 0 13 0 13 13 0 8 0 bufpl 280 3327 0 131 229 0 229 229 0 8 0 anonpl 32 8503 0 0 69 0 69 69 0 246 0 amapchunkpl 152 12172 0 11560 29 0 29 29 0 158 3 amappl16 200 2236 0 2020 14 2 12 12 0 8 0 amappl15 192 8 0 8 1 1 0 1 0 8 0 amappl14 184 33 0 33 1 1 0 1 0 8 0 amappl13 176 433 0 432 1 0 1 1 0 8 0 amappl12 168 950 0 907 3 0 3 3 0 8 0 amappl11 160 7 0 7 1 1 0 1 0 8 0 amappl10 152 53 0 39 1 0 1 1 0 8 0 amappl9 144 266 0 266 1 1 0 1 0 8 0 amappl8 136 38 0 36 1 0 1 1 0 8 0 amappl7 128 80 0 79 1 0 1 1 0 8 0 amappl6 120 276 0 263 1 0 1 1 0 8 0 amappl5 112 72 0 62 1 0 1 1 0 8 0 amappl4 104 423 0 393 1 0 1 1 0 8 0 amappl3 96 1991 0 1887 3 0 3 3 0 8 0 amappl2 88 658 0 580 2 0 2 2 0 8 0 amappl1 80 9946 0 9340 15 0 15 15 0 8 0 amappl 88 3265 0 3077 5 0 5 5 0 92 0 uvmvnodes 80 106 0 0 3 0 3 3 0 8 0 dma16384 16384 1 0 1 1 0 1 1 0 8 1 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 36 0 0 1 0 1 1 0 8 0 uaddrrnd 24 541 0 509 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 541 0 509 1 0 1 1 0 8 0 vmmpekpl 168 6329 0 6289 3 0 3 3 0 8 0 vmmpepl 168 42655 0 40472 95 0 95 95 0 357 0 vmsppl 488 540 0 509 5 0 5 5 0 8 1 rwobjpl 80 15230 0 13943 27 0 27 27 0 8 0 pdppl 4096 1090 0 1018 98 26 72 84 0 8 0 pvpl 32 16154 0 0 131 0 131 131 0 265 0 pmappl 256 540 0 509 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 276 0 28 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(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(fffffd806d300ff0,ffff800000c31000) at in6_hasmulti+0x41 in6_lookupmulti sys/netinet6/in6.c:-1 [inline] in6_hasmulti(fffffd806d300ff0,ffff800000c31000) at in6_hasmulti+0x41 sys/netinet6/in6.c:1150 ip6_output(fffffd806d300f00,ffffffff839eee58,0,0,ffff80002a2109d0,0) at ip6_output+0x13bd sys/netinet6/ip6_output.c:507 mld6_sendpkt(ffff8000015c8080,84,ffff80002a210a68) at mld6_sendpkt+0x385 sys/netinet6/mld6.c:499 mld6_stop_listening(ffff8000015c8080,ffff800000c31000) at mld6_stop_listening+0x125 sys/netinet6/mld6.c:168 in6_delmulti(ffff8000015c8080) at in6_delmulti+0xb1 sys/netinet6/in6.c:1118 in6_purgeaddr(ffff80000159c400) at in6_purgeaddr+0x1d5 in6_leavegroup sys/netinet6/in6.c:1181 [inline] in6_purgeaddr(ffff80000159c400) at in6_purgeaddr+0x1d5 sys/netinet6/in6.c:916 nd6_expire(0) at nd6_expire+0x111 sys/netinet6/nd6.c:-1 taskq_thread(ffff80000002c000) at taskq_thread+0x157 sys/kern/kern_task.c:446 end trace frame: 0x0, count: -12 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 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc syscall(ffff80003c495c10) at syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline] syscall(ffff80003c495c10) at syscall+0xaf4 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x22f6e8d2aa0, 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 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc syscall(ffff80003c495c10) at syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline] syscall(ffff80003c495c10) at syscall+0xaf4 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x22f6e8d2aa0, count: -6