panic: excl->share Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 314721 8962 0 0 0x4000000 0 syz-executor *309185 85367 0 0x14000 0x200 1 softclockmp db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833b5a1c) at panic+0x1e5 sys/kern/subr_prf.c:198 witness_checkorder(ffff800001585878,1,0) at witness_checkorder+0x122c sys/kern/subr_witness.c:854 rw_do_enter_read(ffff800001585860,0) at rw_do_enter_read+0x99 sys/kern/kern_rwlock.c:355 in6_hasmulti(fffffd8070448cf0,ffff800001585800) at in6_hasmulti+0x41 in6_lookupmulti sys/netinet6/in6.c:-1 [inline] in6_hasmulti(fffffd8070448cf0,ffff800001585800) at in6_hasmulti+0x41 sys/netinet6/in6.c:1150 ip6_output(fffffd8070448c00,ffffffff83987338,0,0,ffff80002a1fe3a0,0) at ip6_output+0x13bd sys/netinet6/ip6_output.c:507 mld6_sendpkt(ffff8000015a4180,83,0) 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(ffffffff83a152a8) at pffasttimo+0x184 sys/kern/uipc_domain.c:-1 timeout_run(ffffffff8383b068,ffffffff83a152a8) at timeout_run+0x159 sys/kern/kern_timeout.c:698 softclock_thread_run(ffffffff8383b068) at softclock_thread_run+0xe7 sys/kern/kern_timeout.c:842 softclock_thread_mp(ffff8000ffffe530) 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{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(ffffffff833b5a1c) at panic+0x1e5 sys/kern/subr_prf.c:198 witness_checkorder(ffff800001585878,1,0) at witness_checkorder+0x122c sys/kern/subr_witness.c:854 rw_do_enter_read(ffff800001585860,0) at rw_do_enter_read+0x99 sys/kern/kern_rwlock.c:355 in6_hasmulti(fffffd8070448cf0,ffff800001585800) at in6_hasmulti+0x41 in6_lookupmulti sys/netinet6/in6.c:-1 [inline] in6_hasmulti(fffffd8070448cf0,ffff800001585800) at in6_hasmulti+0x41 sys/netinet6/in6.c:1150 ip6_output(fffffd8070448c00,ffffffff83987338,0,0,ffff80002a1fe3a0,0) at ip6_output+0x13bd sys/netinet6/ip6_output.c:507 mld6_sendpkt(ffff8000015a4180,83,0) 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(ffffffff83a152a8) at pffasttimo+0x184 sys/kern/uipc_domain.c:-1 timeout_run(ffffffff8383b068,ffffffff83a152a8) at timeout_run+0x159 sys/kern/kern_timeout.c:698 softclock_thread_run(ffffffff8383b068) at softclock_thread_run+0xe7 sys/kern/kern_timeout.c:842 softclock_thread_mp(ffff8000ffffe530) at softclock_thread_mp+0x86 end trace frame: 0x0, count: -12 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff80002a1fdff0 rbx 0xffff8000299dee07 rdx 0 rcx 0xffff8000ffffe530 rax 0xffff8000299ddff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0xd561419f5cf29e03 r11 0x66688ee353d30fa3 r12 0xffff8000299dec08 r13 0 r14 0 r15 0x1 rip 0xffffffff817c1d35 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80002a1fdfe0 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (softclockmp) tid=309185 pid=85367 tcnt=1 stat=onproc flags process=14000 proc=200 runpri=50, usrpri=50, slppri=0, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000ffffea60,0xffff8000ffffe010 process=0xffff8000ffffa1b0 user=0xffff80002a1f9000, vmspace=0xffffffff838bee00 estcpu=0, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 63876 326134 16574 0 2 0 syz-executor 8962 24775 75914 0 2 0 syz-executor 8962 216177 75914 0 2 0x4000000 syz-executor 8962 328311 75914 0 3 0x4000080 fsleep syz-executor 8962 314721 75914 0 7 0x4000000 syz-executor 80027 479200 73340 0 2 0 syz-executor 80027 462371 73340 0 3 0x4000080 fsleep syz-executor 6110 438556 12304 0 2 0 syz-executor 6110 387331 12304 0 3 0x4000080 fsleep syz-executor 38065 58246 99629 0 2 0xc80 syz-executor 38065 237205 99629 0 3 0x4000080 fsleep syz-executor 38065 151312 99629 0 3 0x4000080 kqread syz-executor 38065 387051 99629 0 3 0x4000080 fsleep syz-executor 99629 323261 92441 0 2 0xc82 syz-executor 12304 243255 92441 0 2 0xc82 syz-executor 75914 206956 92441 0 2 0xc82 syz-executor 48997 328423 92441 0 2 0xc82 syz-executor 73340 277931 92441 0 2 0xc82 syz-executor 16574 465629 92441 0 2 0xc82 syz-executor 5280 209354 92441 0 2 0x2 syz-executor 53866 185600 92441 0 2 0xc82 syz-executor 92441 520813 42222 0 3 0x82 kqread syz-executor 42222 433404 76275 0 3 0x10008a sigsusp ksh 76275 347236 51584 0 3 0x98 kqread sshd-session 51584 247407 26968 0 3 0x92 kqread sshd-session 54435 158847 1 0 3 0x100083 ttyin getty 26968 9413 1 0 3 0x88 kqread sshd 92315 457746 42991 74 3 0x1100092 bpf pflogd 42991 4912 1 0 3 0x80 sbwait pflogd 86890 521941 22158 73 3 0x1100090 kqread syslogd 22158 82884 1 0 3 0x100082 sbwait syslogd 95873 477675 1 0 3 0x100080 kqread resolvd 49958 258021 65334 77 3 0x100092 kqread dhcpleased 78769 41034 65334 77 3 0x100092 kqread dhcpleased 65334 71158 1 0 3 0x80 kqread dhcpleased 28900 354890 0 0 3 0x14200 bored smr 73122 452248 0 0 3 0x14200 pgzero zerothread 38905 506622 0 0 3 0x14200 aiodoned aiodoned 6121 411982 0 0 3 0x14200 syncer update 17852 348744 0 0 3 0x14200 cleaner cleaner 34287 75227 0 0 3 0x14200 reaper reaper 83263 78159 0 0 3 0x14200 pgdaemon pagedaemon 57730 23523 0 0 3 0x14200 bored viomb 95652 426533 0 0 3 0x40014200 acpi0 acpi0 43786 433990 0 0 3 0x40014200 idle1 49691 199116 0 0 3 0x14200 bored softnet1 61426 325012 0 0 2 0x14200 softnet0 69316 517490 0 0 3 0x14200 smrbar systqmp 54072 444125 0 0 3 0x14200 bored systq *85367 309185 0 0 7 0x14200 softclockmp 48467 347172 0 0 3 0x40014200 tmoslp softclock 18836 54686 0 0 3 0x40014200 idle0 1 14161 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 5280 (syz-executor) thread 0xffff80002a262fa0 (209354) exclusive rrwlock inode r = 0 (0xfffffd8069ca2b50) #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 (0xfffffd8070457570) #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 Process 69316 (systqmp) thread 0xffff8000ffffe298 (517490) shared rwlock systqmp r = 0 (0xffffffff837bcb68) #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 Process 85367 (softclockmp) thread 0xffff8000ffffe530 (309185) exclusive rwlock maddr r = 0 (0xffff800001585878) #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 (0xffffffff83832e50) #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 (0xffffffff8383b008) #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{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11063 12152K 12297K 166960K 12337 0 pcb 18 12K 12K 166960K 37 0 rtable 233 8K 8K 166960K 386 0 pf 34 17K 82K 166960K 65 0 ifaddr 43 7K 8K 166960K 58 0 ifgroup 55 2K 2K 166960K 81 0 sysctl 2 1K 9K 166960K 6 0 counters 70 37K 37K 166960K 98 0 ioctlops 0 0K 4K 166960K 1512 0 iov 0 0K 4K 166960K 3 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1388 87K 88K 166960K 1511 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 4 0K 0K 166960K 4 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 89K 166960K 241 0 sigio 0 0K 0K 166960K 3 0 proc 72 115K 163K 166960K 553 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 8 0 in_multi 99 7K 7K 166960K 104 0 ether_multi 2 0K 0K 166960K 2 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 67 307K 307K 166960K 67 0 exec 0 0K 1K 166960K 417 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 250 168K 182K 166960K 4205 0 UVM aobj 5 4K 4K 166960K 5 0 pinsyscall 42 84K 105K 166960K 1368 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 10 0 NDP 12 0K 2K 166960K 36 0 temp 36 8666K 8734K 166960K 11938 0 kqueue 14 20K 30K 166960K 49 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 38 0 35 1 0 1 1 0 8 0 rtentry 176 117 0 15 6 0 6 6 0 8 0 unpcb 144 73 0 56 1 0 1 1 0 8 0 syncache 336 3 0 3 1 0 1 1 0 8 1 tcpcb 736 24 0 20 1 0 1 1 0 8 0 arp 136 18 0 0 1 0 1 1 0 8 0 inpcb 328 130 0 122 2 0 2 2 0 8 1 nd6 152 26 0 0 1 0 1 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1192 10 0 10 1 0 1 1 0 8 1 pppxif 1576 2 0 2 1 0 1 1 0 8 1 pffrag 232 3 0 0 1 0 1 1 0 482 0 pffrnode 88 3 0 0 1 0 1 1 0 8 0 pffrent 40 5 0 2 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 20 0 0 1 0 1 1 0 8 0 pfstkey 128 20 0 0 1 0 1 1 0 8 0 pfstate 448 20 0 0 3 0 3 3 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 256 502 0 47 31 0 31 31 0 8 1 art_table 40 503 0 47 6 0 6 6 0 8 0 art_node 32 116 0 23 1 0 1 1 0 8 0 semupl 112 1 0 1 1 0 1 1 0 8 1 semapl 112 2 0 0 1 0 1 1 0 8 0 shmpl 112 1 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1782 0 269 96 0 96 96 0 8 0 ffsino 296 1782 0 269 118 0 118 118 0 8 0 nchpl 144 2115 0 416 64 0 64 64 0 8 0 rtmask 32 4 0 4 1 0 1 1 0 8 1 vnodes 216 1972 0 0 110 0 110 110 0 8 0 namei 1024 6947 0 6946 1 0 1 1 0 8 0 percpumem 16 64 0 14 1 0 1 1 0 8 0 vcpupl 3968 1 0 0 1 0 1 1 0 8 0 vmpool 848 1 0 0 1 0 1 1 0 8 0 kstatmem 264 42 0 16 3 0 3 3 0 8 1 scxspl 216 9326 0 9326 3 2 1 2 1 8 1 plimitpl 152 72 0 55 1 0 1 1 0 8 0 sigapl 424 550 0 503 7 0 7 7 0 8 1 knotepl 120 307 0 0 10 0 10 10 0 8 0 kqueuepl 224 100 0 87 3 0 3 3 0 8 1 pipepl 344 142 0 115 5 0 5 5 0 8 2 fdescpl 528 534 0 503 3 0 3 3 0 8 0 filepl 160 2257 0 2032 12 0 12 12 0 8 0 lockfpl 104 57 0 54 1 0 1 1 0 8 0 lockfspl 48 28 0 25 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 104 161 0 147 1 0 1 1 0 8 0 zombiepl 144 505 0 503 1 0 1 1 0 8 0 processpl 1232 550 0 503 5 0 5 5 0 8 1 procpl 664 751 0 696 6 0 6 6 0 8 0 sockpl 752 245 0 217 5 0 5 5 0 8 1 mcl64k 65536 2 0 0 1 0 1 1 0 8 0 mcl16k 16384 6 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 133 0 0 17 0 17 17 0 8 0 mcl2k 2048 22 0 0 3 0 3 3 0 8 0 mtagpl 96 5 0 0 1 0 1 1 0 8 0 mbufpl 256 152 0 0 10 0 10 10 0 8 0 bufpl 280 3852 0 132 266 0 266 266 0 8 0 anonpl 32 7535 0 0 61 0 61 61 0 246 0 amapchunkpl 152 12488 0 11853 28 0 28 28 0 158 3 amappl16 200 2225 0 2203 14 0 14 14 0 8 5 amappl15 192 4 0 4 1 1 0 1 0 8 0 amappl14 184 8 0 8 1 1 0 1 0 8 0 amappl13 176 427 0 426 1 0 1 1 0 8 0 amappl12 168 891 0 848 3 0 3 3 0 8 0 amappl11 160 6 0 6 1 1 0 1 0 8 0 amappl10 152 47 0 33 1 0 1 1 0 8 0 amappl9 144 249 0 249 1 1 0 1 0 8 0 amappl8 136 33 0 31 1 0 1 1 0 8 0 amappl7 128 80 0 79 1 0 1 1 0 8 0 amappl6 120 281 0 266 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 1931 0 1836 4 1 3 3 0 8 0 amappl2 88 639 0 564 2 0 2 2 0 8 0 amappl1 80 9446 0 8854 15 0 15 15 0 8 1 amappl 88 3460 0 3288 5 0 5 5 0 92 0 uvmvnodes 80 104 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 24 534 0 503 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 534 0 503 1 0 1 1 0 8 0 vmmpekpl 168 6192 0 6157 2 0 2 2 0 8 0 vmmpepl 168 41714 0 39810 97 0 97 97 0 357 3 vmsppl 488 533 0 503 5 0 5 5 0 8 1 rwobjpl 80 14878 0 13846 27 0 27 27 0 8 0 pdppl 4096 1077 0 1007 95 23 72 83 0 8 2 pvpl 32 13835 0 0 113 1 112 112 0 265 0 pmappl 256 534 0 503 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 271 0 25 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff83878ff0) 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(ffffffff83970900) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83970900) at __mp_lock+0x192 sys/kern/kern_lock.c:173 doopenat(ffff8000fffe4028,ffffff9c,200000000140,10686,8,ffff80003c422550) at doopenat+0x345 sys/kern/vfs_syscalls.c:1138 syscall(ffff80003c422600) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c422600) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xfe301a98200, count: 8 ddb{0}> trace x86_ipi_db(ffffffff83878ff0) 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(ffffffff83970900) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83970900) at __mp_lock+0x192 sys/kern/kern_lock.c:173 doopenat(ffff8000fffe4028,ffffff9c,200000000140,10686,8,ffff80003c422550) at doopenat+0x345 sys/kern/vfs_syscalls.c:1138 syscall(ffff80003c422600) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c422600) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xfe301a98200, 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(ffffffff833b5a1c) at panic+0x1e5 sys/kern/subr_prf.c:198 witness_checkorder(ffff800001585878,1,0) at witness_checkorder+0x122c sys/kern/subr_witness.c:854 rw_do_enter_read(ffff800001585860,0) at rw_do_enter_read+0x99 sys/kern/kern_rwlock.c:355 in6_hasmulti(fffffd8070448cf0,ffff800001585800) at in6_hasmulti+0x41 in6_lookupmulti sys/netinet6/in6.c:-1 [inline] in6_hasmulti(fffffd8070448cf0,ffff800001585800) at in6_hasmulti+0x41 sys/netinet6/in6.c:1150 ip6_output(fffffd8070448c00,ffffffff83987338,0,0,ffff80002a1fe3a0,0) at ip6_output+0x13bd sys/netinet6/ip6_output.c:507 mld6_sendpkt(ffff8000015a4180,83,0) 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(ffffffff83a152a8) at pffasttimo+0x184 sys/kern/uipc_domain.c:-1 timeout_run(ffffffff8383b068,ffffffff83a152a8) at timeout_run+0x159 sys/kern/kern_timeout.c:698 softclock_thread_run(ffffffff8383b068) at softclock_thread_run+0xe7 sys/kern/kern_timeout.c:842 softclock_thread_mp(ffff8000ffffe530) at softclock_thread_mp+0x86 end trace frame: 0x0, count: 3 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833b5a1c) at panic+0x1e5 sys/kern/subr_prf.c:198 witness_checkorder(ffff800001585878,1,0) at witness_checkorder+0x122c sys/kern/subr_witness.c:854 rw_do_enter_read(ffff800001585860,0) at rw_do_enter_read+0x99 sys/kern/kern_rwlock.c:355 in6_hasmulti(fffffd8070448cf0,ffff800001585800) at in6_hasmulti+0x41 in6_lookupmulti sys/netinet6/in6.c:-1 [inline] in6_hasmulti(fffffd8070448cf0,ffff800001585800) at in6_hasmulti+0x41 sys/netinet6/in6.c:1150 ip6_output(fffffd8070448c00,ffffffff83987338,0,0,ffff80002a1fe3a0,0) at ip6_output+0x13bd sys/netinet6/ip6_output.c:507 mld6_sendpkt(ffff8000015a4180,83,0) 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(ffffffff83a152a8) at pffasttimo+0x184 sys/kern/uipc_domain.c:-1 timeout_run(ffffffff8383b068,ffffffff83a152a8) at timeout_run+0x159 sys/kern/kern_timeout.c:698 softclock_thread_run(ffffffff8383b068) at softclock_thread_run+0xe7 sys/kern/kern_timeout.c:842 softclock_thread_mp(ffff8000ffffe530) at softclock_thread_mp+0x86 end trace frame: 0x0, count: -12