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 31150 38690 0 0x1000010 0 1 syz-executor *250926 23793 0 0x14000 0x200 0 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(ffff8000015a3878,1,0) at witness_checkorder+0x122c sys/kern/subr_witness.c:854 rw_do_enter_read(ffff8000015a3860,0) at rw_do_enter_read+0x99 sys/kern/kern_rwlock.c:355 in6_hasmulti(fffffd806d5bbaf0,ffff8000015a3800) at in6_hasmulti+0x41 in6_lookupmulti sys/netinet6/in6.c:-1 [inline] in6_hasmulti(fffffd806d5bbaf0,ffff8000015a3800) at in6_hasmulti+0x41 sys/netinet6/in6.c:1150 ip6_output(fffffd806d5bba00,ffffffff839eee58,0,1,ffff80002a1feb10,0) at ip6_output+0x13bd sys/netinet6/ip6_output.c:507 mld6_sendpkt(ffff8000015b2a00,83,0) 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(ffff8000ffffef90) 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{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(ffff8000015a3878,1,0) at witness_checkorder+0x122c sys/kern/subr_witness.c:854 rw_do_enter_read(ffff8000015a3860,0) at rw_do_enter_read+0x99 sys/kern/kern_rwlock.c:355 in6_hasmulti(fffffd806d5bbaf0,ffff8000015a3800) at in6_hasmulti+0x41 in6_lookupmulti sys/netinet6/in6.c:-1 [inline] in6_hasmulti(fffffd806d5bbaf0,ffff8000015a3800) at in6_hasmulti+0x41 sys/netinet6/in6.c:1150 ip6_output(fffffd806d5bba00,ffffffff839eee58,0,1,ffff80002a1feb10,0) at ip6_output+0x13bd sys/netinet6/ip6_output.c:507 mld6_sendpkt(ffff8000015b2a00,83,0) 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(ffff8000ffffef90) at softclock_thread_mp+0x86 end trace frame: 0x0, count: -12 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff80002a1fe760 rbx 0xffffffff837e4e07 cpu_info_full_primary+0x2e07 rdx 0 rcx 0xffff8000ffffef90 rax 0xffffffff837e3ff0 cpu_info_full_primary+0x1ff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0xbf1f8445f0b9b83b r11 0xece0c66f1de94a5c r12 0xffffffff837e4c08 cpu_info_full_primary+0x2c08 r13 0 r14 0 r15 0x1 rip 0xffffffff810e0165 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80002a1fe750 ss 0 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (softclockmp) tid=250926 pid=23793 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=0xffff8000fffff228,0xffff8000ffffed08 process=0xffff8000ffff84d0 user=0xffff80002a1f9000, vmspace=0xffffffff83a0c438 estcpu=0, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 16158 374814 62301 0 2 0 syz-executor 16158 86732 62301 0 3 0x4000080 fsleep syz-executor 38690 31150 79984 0 7 0x1000010 syz-executor 38690 276858 79984 0 3 0x5000090 semwait syz-executor 473 418722 72451 0 2 0 syz-executor 473 288131 72451 0 3 0x4000080 fsleep syz-executor 27038 404371 41743 60929 2 0xc90 syz-executor 27038 189767 41743 60929 2 0x4000010 syz-executor 27038 464394 41743 60929 3 0x4000090 fsleep syz-executor 27038 382285 41743 60929 3 0x4000090 fsleep syz-executor 68829 273119 96588 0 2 0 syz-executor 68829 375277 96588 0 2 0x4000000 syz-executor 68829 490730 96588 0 3 0x4000000 inode syz-executor 68829 168230 96588 0 3 0x4000000 inode syz-executor 68829 202112 96588 0 3 0x4000080 fsleep syz-executor 84816 200595 67497 0 2 0xc80 syz-executor 84816 99148 67497 0 3 0x4000080 pipewr syz-executor 84816 449483 67497 0 3 0x4000080 kqsel syz-executor 84816 245067 67497 0 3 0x4000080 fsleep syz-executor 35829 236373 70981 60929 2 0x10 syz-executor 35829 81213 70981 60929 3 0x4000090 msgwait syz-executor 35829 24967 70981 60929 3 0x4000090 fsleep syz-executor 60345 308797 0 0 3 0x14280 nfsidl nfsio 15037 240230 0 0 3 0x14280 nfsidl nfsio 95442 444522 0 0 3 0x14280 nfsidl nfsio 91642 309929 0 0 3 0x14280 nfsidl nfsio 36015 266699 0 0 3 0x14280 nfsidl nfsio 32147 257838 0 0 3 0x14280 nfsidl nfsio 17626 188181 0 0 3 0x14280 nfsidl nfsio 12991 160200 0 0 3 0x14280 nfsidl nfsio 76840 389677 0 0 3 0x14280 nfsidl nfsio 14521 16461 0 0 3 0x14280 nfsidl nfsio 75385 50752 0 0 3 0x14280 nfsidl nfsio 33966 26832 0 0 3 0x14280 nfsidl nfsio 40559 349514 0 0 3 0x14280 nfsidl nfsio 47935 112852 0 0 3 0x14280 nfsidl nfsio 78357 498314 0 0 3 0x14280 nfsidl nfsio 99468 413561 0 0 3 0x14280 nfsidl nfsio 61095 330303 0 0 3 0x14280 nfsidl nfsio 49313 393690 0 0 3 0x14280 nfsidl nfsio 88502 228523 0 0 3 0x14280 nfsidl nfsio 90873 464779 0 0 3 0x14280 nfsidl nfsio 72451 303181 49045 0 3 0x82 nanoslp syz-executor 57632 110504 49045 0 2 0xc82 syz-executor 79984 23991 49045 0 3 0x82 nanoslp syz-executor 67497 423337 49045 0 3 0x82 nanoslp syz-executor 70981 214784 49045 0 2 0xc82 syz-executor 62301 72886 49045 0 3 0x82 nanoslp syz-executor 96588 311064 49045 0 2 0xc82 syz-executor 41743 320546 49045 0 2 0xc82 syz-executor 49045 460356 14095 0 3 0x82 kqread syz-executor 14095 430877 79276 0 3 0x10008a sigsusp ksh 79276 267992 56223 0 3 0x98 kqread sshd-session 56223 122759 31405 0 3 0x92 kqread sshd-session 97966 465898 1 0 3 0x100083 ttyin getty 31405 151955 1 0 3 0x88 kqread sshd 25165 434011 95606 74 3 0x1100092 bpf pflogd 95606 133807 1 0 3 0x80 sbwait pflogd 22939 340704 56133 73 3 0x1100090 kqread syslogd 56133 366409 1 0 3 0x100082 sbwait syslogd 50762 334523 1 0 3 0x100080 kqread resolvd 3938 249790 76872 77 3 0x100092 kqread dhcpleased 50196 137198 76872 77 3 0x100092 kqread dhcpleased 76872 156094 1 0 3 0x80 kqread dhcpleased 99363 7710 0 0 3 0x14200 bored smr 34141 227533 0 0 2 0x14200 zerothread 39748 130173 0 0 3 0x14200 aiodoned aiodoned 71579 40388 0 0 3 0x14200 syncer update 73234 228247 0 0 3 0x14200 cleaner cleaner 2540 241824 0 0 3 0x14200 reaper reaper 84441 224370 0 0 3 0x14200 pgdaemon pagedaemon 64474 237530 0 0 3 0x14200 bored viomb 13198 516353 0 0 3 0x40014200 acpi0 acpi0 17833 236857 0 0 3 0x40014200 idle1 67900 511649 0 0 3 0x14200 bored softnet1 69294 98489 0 0 3 0x14200 bored softnet0 7705 409159 0 0 3 0x14200 bored systqmp 75947 412537 0 0 3 0x14200 bored systq *23793 250926 0 0 7 0x14200 softclockmp 47537 101754 0 0 3 0x40014200 tmoslp softclock 11902 413895 0 0 3 0x40014200 idle0 1 130240 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 68829 (syz-executor) thread 0xffff800030bc62b8 (375277) exclusive rrwlock inode r = 0 (0xfffffd8076165c70) #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 68829 (syz-executor) thread 0xffff80003c494560 (168230) exclusive rrwlock inode r = 0 (0xfffffd8076165b48) #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 dofstatat+0xf2 sys/kern/vfs_syscalls.c:2086 #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 23793 (softclockmp) thread 0xffff8000ffffef90 (250926) exclusive rwlock maddr r = 0 (0xffff8000015a3878) #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{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11064 12217K 12255K 166960K 12186 0 pcb 21 12K 12K 166960K 26 0 rtable 237 6K 7K 166960K 353 0 pf 36 17K 18K 166960K 47 0 ifaddr 44 7K 7K 166960K 46 0 ifgroup 59 2K 2K 166960K 59 0 sysctl 1 1K 9K 166960K 5 0 counters 72 37K 37K 166960K 72 0 ioctlops 0 0K 4K 166960K 1485 0 iov 0 0K 2K 166960K 1 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1345 85K 85K 166960K 1383 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 4 0 VM map 2 1K 1K 166960K 2 0 sem 4 0K 0K 166960K 4 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 89K 166960K 157 0 proc 72 131K 147K 166960K 531 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 10 0 in_multi 99 7K 7K 166960K 99 0 ether_multi 1 0K 0K 166960K 1 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 43 201K 201K 166960K 43 0 exec 0 0K 1K 166960K 376 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 266 168K 178K 166960K 3380 0 UVM aobj 4 2K 2K 166960K 5 0 pinsyscall 43 86K 104K 166960K 1286 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 2 0K 0K 166960K 2 0 NDP 15 0K 1K 166960K 29 0 temp 39 8666K 8730K 166960K 4149 0 kqueue 21 29K 29K 166960K 31 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 35 0 31 1 0 1 1 0 8 0 rtentry 176 111 0 1 5 0 5 5 0 8 0 unpcb 144 45 0 26 1 0 1 1 0 8 0 syncache 336 4 0 4 1 0 1 1 0 8 1 tcpcb 736 15 0 9 1 0 1 1 0 8 0 arp 136 18 0 0 1 0 1 1 0 8 0 inpcb 328 89 0 75 2 0 2 2 0 8 0 nd6 152 24 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 18 0 0 1 0 1 1 0 8 0 pfstkey 128 18 0 0 1 0 1 1 0 8 0 pfstate 448 18 0 0 2 0 2 2 0 8 0 pfrule 1344 22 0 17 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 453 0 0 29 0 29 29 0 8 0 art_table 40 454 0 0 5 0 5 5 0 8 0 art_node 32 111 0 11 1 0 1 1 0 8 0 sysvmsgpl 40 1 0 1 1 0 1 1 0 8 1 semapl 112 2 0 0 1 0 1 1 0 8 0 shmpl 112 2 0 1 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1609 0 86 96 0 96 96 0 8 0 ffsino 296 1609 0 86 118 0 118 118 0 8 0 nchpl 144 1838 0 128 64 0 64 64 0 8 0 vnodes 216 1710 0 0 95 0 95 95 0 8 0 namei 1024 5777 0 5776 1 0 1 1 0 8 0 percpumem 16 51 0 0 1 0 1 1 0 8 0 kstatmem 264 28 0 0 2 0 2 2 0 8 0 scxspl 216 6265 0 6265 3 1 2 2 1 8 2 plimitpl 152 30 0 11 1 0 1 1 0 8 0 sigapl 424 486 0 418 9 0 9 9 0 8 0 knotepl 120 266 0 0 9 0 9 9 0 8 0 kqueuepl 224 26 0 11 1 0 1 1 0 8 0 pipepl 344 118 0 90 3 0 3 3 0 8 0 fdescpl 528 450 0 418 3 0 3 3 0 8 0 filepl 160 1792 0 1527 12 0 12 12 0 8 0 lockfpl 104 9 0 6 1 0 1 1 0 8 0 lockfspl 48 6 0 3 1 0 1 1 0 8 0 sessionpl 144 23 0 14 1 0 1 1 0 8 0 pgrppl 48 31 0 14 1 0 1 1 0 8 0 ucredpl 104 97 0 81 1 0 1 1 0 8 0 zombiepl 144 419 0 418 1 0 1 1 0 8 0 processpl 1232 486 0 418 6 0 6 6 0 8 0 procpl 664 529 0 446 7 0 7 7 0 8 0 sockpl 752 169 0 132 5 0 5 5 0 8 0 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 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 112 0 0 14 0 14 14 0 8 0 mcl2k 2048 21 0 0 3 0 3 3 0 8 0 mtagpl 96 4 0 0 1 0 1 1 0 8 0 mbufpl 256 138 0 0 9 0 9 9 0 8 0 bufpl 280 2484 0 131 169 0 169 169 0 8 0 anonpl 32 3935 0 0 32 0 32 32 0 246 0 amapchunkpl 152 9206 0 8639 22 0 22 22 0 158 0 amappl16 200 1981 0 1922 5 0 5 5 0 8 1 amappl15 192 4 0 4 1 1 0 1 0 8 0 amappl14 184 9 0 8 1 0 1 1 0 8 0 amappl13 176 425 0 423 1 0 1 1 0 8 0 amappl12 168 813 0 770 3 0 3 3 0 8 0 amappl11 160 4 0 3 1 0 1 1 0 8 0 amappl10 152 50 0 36 1 0 1 1 0 8 0 amappl9 144 250 0 250 1 0 1 1 0 8 1 amappl8 136 25 0 23 1 0 1 1 0 8 0 amappl7 128 81 0 80 1 0 1 1 0 8 0 amappl6 120 286 0 273 1 0 1 1 0 8 0 amappl5 112 78 0 68 1 0 1 1 0 8 0 amappl4 104 433 0 404 1 0 1 1 0 8 0 amappl3 96 1419 0 1312 4 1 3 3 0 8 0 amappl2 88 563 0 488 2 0 2 2 0 8 0 amappl1 80 9413 0 8816 15 0 15 15 0 8 1 amappl 88 2639 0 2451 5 0 5 5 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 4 0 1 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 5642 0 5610 2 0 2 2 0 8 0 vmmpepl 168 37231 0 35206 90 0 90 90 0 357 0 vmsppl 488 449 0 418 5 0 5 5 0 8 0 rwobjpl 80 13977 0 12896 24 0 24 24 0 8 0 pdppl 4096 908 0 836 96 18 78 84 0 8 6 pvpl 32 11313 0 0 92 0 92 92 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 112 265 0 20 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(ffff8000015a3878,1,0) at witness_checkorder+0x122c sys/kern/subr_witness.c:854 rw_do_enter_read(ffff8000015a3860,0) at rw_do_enter_read+0x99 sys/kern/kern_rwlock.c:355 in6_hasmulti(fffffd806d5bbaf0,ffff8000015a3800) at in6_hasmulti+0x41 in6_lookupmulti sys/netinet6/in6.c:-1 [inline] in6_hasmulti(fffffd806d5bbaf0,ffff8000015a3800) at in6_hasmulti+0x41 sys/netinet6/in6.c:1150 ip6_output(fffffd806d5bba00,ffffffff839eee58,0,1,ffff80002a1feb10,0) at ip6_output+0x13bd sys/netinet6/ip6_output.c:507 mld6_sendpkt(ffff8000015b2a00,83,0) 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(ffff8000ffffef90) at softclock_thread_mp+0x86 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 end of kernel end trace frame: 0x7d2d385e7580, 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: 0x7d2d385e7580, count: -3