panic: ip6_getpcbopt: unexpected option
Stopped at db_enter+0x25: addq $0x8,%rsp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
* 53170 93167 60929 0x10 0x4000000 1 syz-executor
218787 89640 0 0x2 0 0 syz-executor
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff8352a2a4) at panic+0x1e5 sys/kern/subr_prf.c:198
ip6_getpcbopt(0,33,fffffc8066d22800) at ip6_getpcbopt+0x3e3
ip6_ctloutput(0,ffff800010fdd790,29,33,fffffc8066d22800) at ip6_ctloutput+0xfb2 sys/netinet6/ip6_output.c:1487
sogetopt(ffff800010fdd790,29,33,fffffc8066d22800) at sogetopt+0x128 sys/kern/uipc_socket.c:2074
sys_getsockopt(ffff800037b95a18,ffff800039f9c080,ffff800039f9bfd0) at sys_getsockopt+0x1ec sys/kern/uipc_syscalls.c:1263
syscall(ffff800039f9c080) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff800039f9c080) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xb2608ddeab0, count: 7
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: ip6_getpcbopt: unexpected option
ddb{1}> trace
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff8352a2a4) at panic+0x1e5 sys/kern/subr_prf.c:198
ip6_getpcbopt(0,33,fffffc8066d22800) at ip6_getpcbopt+0x3e3
ip6_ctloutput(0,ffff800010fdd790,29,33,fffffc8066d22800) at ip6_ctloutput+0xfb2 sys/netinet6/ip6_output.c:1487
sogetopt(ffff800010fdd790,29,33,fffffc8066d22800) at sogetopt+0x128 sys/kern/uipc_socket.c:2074
sys_getsockopt(ffff800037b95a18,ffff800039f9c080,ffff800039f9bfd0) at sys_getsockopt+0x1ec sys/kern/uipc_syscalls.c:1263
syscall(ffff800039f9c080) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff800039f9c080) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xb2608ddeab0, count: -8
ddb{1}> show registers
rdi 0
rsi 0x1
rbp 0xffff800039f9bce0
rbx 0xffff80002998ee07
rdx 0xffff8000015f7800
rcx 0xffff800037b95a18
rax 0xffff80002998dff0
r8 0x101010101010101
r9 0x8080808080808080
r10 0x2c9b2d56ee9789f5
r11 0x58765c778ce56287
r12 0xffff80002998ec08
r13 0
r14 0
r15 0x1
rip 0xffffffff81f4bd85 db_enter+0x25
cs 0x8
rflags 0x246
rsp 0xffff800039f9bcd0
ss 0x10
db_enter+0x25: addq $0x8,%rsp
ddb{1}> show proc
PROC (syz-executor) tid=53170 pid=93167 tcnt=3 stat=onproc
flags process=10<SUGID> proc=4000000<THREAD>
runpri=32, usrpri=86, slppri=32, nice=20
wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0
forw=0xffffffffffffffff, list=0xffff800037b94a88,0xffff807ffffeed20
process=0xffff807ffffe49c0 user=0xffff800039f97000, vmspace=0xfffffc806a197d78
estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=0, intr=1
ddb{1}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
75219 420817 45123 0 3 0x80 nanoslp syz-executor
75219 480064 45123 0 3 0x4000080 fsleep syz-executor
75219 272923 45123 0 3 0x4000080 fsleep syz-executor
75219 421704 45123 0 3 0x4000080 fsleep syz-executor
65100 314240 62573 0 3 0x80 nanoslp syz-executor
65100 489535 62573 0 3 0x4000080 rest syz-executor
65100 245073 62573 0 3 0x4000080 fsleep syz-executor
61327 468261 38559 0 3 0x80 nanoslp syz-executor
61327 190806 38559 0 3 0x4000080 kqsel syz-executor
61327 516358 38559 0 3 0x4000000 smrbar syz-executor
61327 74219 38559 0 3 0x4000080 fsleep syz-executor
85616 156938 34339 -1 3 0x90 nanoslp syz-executor
85616 232622 34339 -1 3 0x4000090 kqsel syz-executor
85616 60676 34339 -1 3 0x4000090 kqread syz-executor
85616 58870 34339 -1 3 0x4000090 fsleep syz-executor
22620 67053 62941 0 3 0x90 nanoslp syz-executor
22620 226391 62941 0 3 0x4000090 kqsel syz-executor
22620 85116 62941 0 3 0x4000090 fsleep syz-executor
93167 397777 72231 60929 2 0x10 syz-executor
*93167 53170 72231 60929 7 0x4000010 syz-executor
93167 483133 72231 60929 3 0x4000090 fsleep syz-executor
52794 195529 63028 0 3 0x80 nanoslp syz-executor
52794 129627 63028 0 3 0x4000088 kqread syz-executor
62941 474379 73067 0 3 0x82 nanoslp syz-executor
89640 218787 73067 0 7 0x2 syz-executor
34339 310721 73067 0 3 0x82 nanoslp syz-executor
38559 40515 73067 0 3 0x82 nanoslp syz-executor
72231 47433 73067 0 3 0x82 nanoslp syz-executor
45123 322378 73067 0 3 0x82 nanoslp syz-executor
63028 281054 73067 0 3 0x82 nanoslp syz-executor
62573 135368 73067 0 3 0x82 nanoslp syz-executor
73067 221280 66519 0 3 0x82 kqread syz-executor
66519 258259 3623 0 3 0x10008a sigsusp ksh
3623 141418 13839 0 3 0x98 kqread sshd-session
13839 9554 58140 0 3 0x92 kqread sshd-session
6151 100760 1 0 3 0x100083 ttyin getty
58140 258765 1 0 3 0x88 kqread sshd
42813 523001 860 74 3 0x1100092 bpf pflogd
860 263137 1 0 3 0x80 sbwait pflogd
77926 383386 19519 73 3 0x1100090 kqread syslogd
19519 376275 1 0 3 0x100082 sbwait syslogd
57349 360469 1 0 3 0x100080 kqread resolvd
7587 4691 39541 77 3 0x100092 kqread dhcpleased
99831 333198 39541 77 3 0x100092 kqread dhcpleased
39541 142635 1 0 3 0x80 kqread dhcpleased
13943 55241 0 0 3 0x14200 bored smr
78584 499027 0 0 3 0x14200 pgzero zerothread
30996 249660 0 0 3 0x14200 aiodoned aiodoned
60604 139724 0 0 3 0x14200 syncer update
62625 228562 0 0 3 0x14200 cleaner cleaner
23395 430782 0 0 3 0x14200 reaper reaper
92044 419186 0 0 3 0x14200 pgdaemon pagedaemon
30071 95501 0 0 3 0x14200 bored viomb
32502 77389 0 0 3 0x40014200 acpi0 acpi0
69188 390207 0 0 3 0x40014200 idle1
57457 181865 0 0 3 0x14200 bored softnet1
59796 494747 0 0 3 0x14200 bored softnet0
95367 91208 0 0 3 0x14200 bored systqmp
90322 244259 0 0 3 0x14200 bored systq
7483 212604 0 0 3 0x14200 tmoslp softclockmp
92857 502532 0 0 3 0x40014200 tmoslp softclock
40241 439826 0 0 3 0x40014200 idle0
1 423633 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{1}> show all locks
Process 61327 (syz-executor) thread 0xffff807ffffee2b0 (516358)
exclusive rwlock clonelk r = 0 (0xffffffff838d9328)
#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 if_clone_destroy+0x93 sys/net/if.c:-1
#3 ifioctl+0x59d sys/net/if.c:2160
#4 fifo_ioctl+0x12f sys/miscfs/fifofs/fifo_vnops.c:314
#5 VOP_IOCTL+0xac sys/kern/vfs_vops.c:264
#6 vn_ioctl+0xf8 sys/kern/vfs_vnops.c:537
#7 sys_ioctl+0x674 sys/kern/sys_generic.c:-1
#8 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#8 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783
#9 Xsyscall+0x128
Process 93167 (syz-executor) thread 0xffff800037b95a18 (53170)
exclusive rwlock netlock r = 0 (0xffffffff838d9420)
#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 sogetopt+0x105 sys/kern/uipc_socket.c:2074
#3 sys_getsockopt+0x1ec sys/kern/uipc_syscalls.c:1263
#4 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#4 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783
#5 Xsyscall+0x128
Process 89640 (syz-executor) thread 0xffff807ffffef4d8 (218787)
exclusive rrwlock inode r = 0 (0xfffffc806d7f10b8)
#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:3062
#10 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#10 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
#11 Xsyscall+0x128
exclusive rrwlock inode r = 0 (0xfffffc806aa9d8d0)
#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:576
#5 vfs_lookup+0x12b sys/kern/vfs_lookup.c:431
#6 namei+0x7c5 sys/kern/vfs_lookup.c:250
#7 domkdirat+0x8b sys/kern/vfs_syscalls.c:3047
#8 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#8 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
#9 Xsyscall+0x128
ddb{1}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 11097 12221K 12351K 166960K 12373 0
pcb 20 12K 12K 166960K 43 0
rtable 239 7K 7K 166960K 368 0
pf 35 17K 19K 166960K 60 0
ifaddr 44 7K 8K 166960K 55 0
ifgroup 55 2K 2K 166960K 74 0
sysctl 3 1K 9K 166960K 8 0
counters 70 37K 37K 166960K 84 0
ioctlops 0 0K 4K 166960K 1511 0
iov 0 0K 12K 166960K 3 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1298 82K 82K 166960K 1450 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 10 0K 0K 166960K 10 0
dirhash 12 2K 2K 166960K 12 0
ACPI 1692 195K 286K 166960K 12470 0
file desc 17 61K 81K 166960K 261 0
proc 71 115K 147K 166960K 560 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 1 0K 0K 166960K 15 0
in_multi 103 7K 7K 166960K 105 0
ether_multi 1 0K 0K 166960K 1 0
mrt 0 0K 0K 166960K 7 0
ISOFS mount 1 32K 32K 166960K 1 0
MSDOSFS mount 1 16K 16K 166960K 1 0
ttys 235 1049K 1049K 166960K 235 0
exec 0 0K 1K 166960K 399 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 254 160K 168K 166960K 4136 0
UVM aobj 9 2K 2K 166960K 9 0
pinsyscall 42 84K 96K 166960K 1420 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
ip6_options 0 0K 0K 166960K 5 0
NDP 12 0K 2K 166960K 33 0
temp 40 9115K 9178K 166960K 5351 0
kqueue 19 32K 32K 166960K 56 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 36 0 33 1 0 1 1 0 8 0
rtentry 176 118 0 8 6 0 6 6 0 8 0
unpcb 144 113 0 86 1 0 1 1 0 8 0
syncache 336 5 0 5 1 0 1 1 0 8 1
tcpcb 736 39 0 33 1 0 1 1 0 8 0
arp 136 19 0 1 1 0 1 1 0 8 0
inpcb 328 166 0 151 2 0 2 2 0 8 0
nd6 152 26 0 1 1 0 1 1 0 8 0
kcovpl 48 8 0 0 1 0 1 1 0 8 0
ppxss 1192 4 0 4 1 0 1 1 0 8 1
pppxif 1576 2 0 2 1 0 1 1 0 8 1
pfstscr 40 2 0 2 1 0 1 1 0 8 1
pffrag 232 1 0 1 1 0 1 1 0 482 1
pffrnode 88 1 0 1 1 0 1 1 0 8 1
pffrent 40 3 0 3 1 0 1 1 0 8 1
pfosfp 40 1428 0 1005 5 0 5 5 0 8 0
pfosfpen 112 1428 0 714 21 0 21 21 0 8 0
pfstlim 224 2 0 2 1 0 1 1 0 8 1
pfstitem 24 66 0 32 1 0 1 1 0 8 0
pfstkey 128 68 0 34 2 0 2 2 0 8 0
pfstate 448 67 0 33 8 0 8 8 0 8 3
pfrule 1360 23 0 18 2 1 1 2 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 487 0 34 30 0 30 30 0 8 0
art_table 40 488 0 34 5 0 5 5 0 8 0
art_node 32 118 0 18 1 0 1 1 0 8 0
sysvmsgpl 40 1 0 1 1 0 1 1 0 8 1
semapl 72 8 0 0 1 0 1 1 0 8 0
shmpl 112 6 0 0 1 0 1 1 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino2pl 256 1795 0 326 93 0 93 93 0 8 0
ffsino 296 1795 0 326 114 0 114 114 0 8 0
nchpl 144 2230 0 521 64 0 64 64 0 8 0
vnodes 216 1938 0 0 108 0 108 108 0 8 0
namei 1024 6982 0 6981 2 0 2 2 0 8 1
percpumem 16 57 0 7 1 0 1 1 0 8 0
kstatmem 264 37 0 10 3 0 3 3 0 8 1
scxspl 216 7577 0 7577 4 3 1 3 1 8 1
plimitpl 152 39 0 20 1 0 1 1 0 8 0
sigapl 424 579 0 532 6 0 6 6 0 8 0
knotepl 120 298 0 0 10 0 10 10 0 8 0
kqueuepl 224 110 0 91 3 0 3 3 0 8 1
pipepl 344 166 0 139 3 0 3 3 0 8 0
fdescpl 528 563 0 532 3 0 3 3 0 8 0
filepl 160 2647 0 2401 13 0 13 13 0 8 2
lockfpl 104 70 0 68 1 0 1 1 0 8 0
lockfspl 48 32 0 30 1 0 1 1 0 8 0
sessionpl 144 63 0 54 1 0 1 1 0 8 0
pgrppl 48 71 0 54 1 0 1 1 0 8 0
ucredpl 104 299 0 283 1 0 1 1 0 8 0
zombiepl 144 532 0 532 1 0 1 1 0 8 1
processpl 1232 579 0 532 5 0 5 5 0 8 0
procpl 664 790 0 727 6 0 6 6 0 8 0
sockpl 752 319 0 274 5 0 5 5 0 8 0
mcl64k 65536 3 0 0 1 0 1 1 0 8 0
mcl16k 16384 2 0 0 1 0 1 1 0 8 0
mcl8k 8192 2 0 0 1 0 1 1 0 8 0
mcl4k 4096 132 0 0 17 0 17 17 0 8 0
mcl2k2 2112 2 0 0 1 0 1 1 0 8 0
mcl2k 2048 13 0 0 2 0 2 2 0 8 0
mtagpl 96 4 0 0 1 0 1 1 0 8 0
mbufpl 256 176 0 0 11 0 11 11 0 8 0
bufpl 272 2703 0 109 173 0 173 173 0 8 0
anonpl 32 5466 0 0 45 0 45 45 0 115 0
amapchunkpl 152 12092 0 11553 25 0 25 25 0 158 3
amappl16 200 1828 0 1799 5 2 3 5 0 8 0
amappl15 192 2 0 2 1 1 0 1 0 8 0
amappl14 184 439 0 437 1 0 1 1 0 8 0
amappl13 176 145 0 133 1 0 1 1 0 8 0
amappl12 168 815 0 785 2 0 2 2 0 8 0
amappl11 160 2 0 2 1 1 0 1 0 8 0
amappl10 152 65 0 51 1 0 1 1 0 8 0
amappl9 144 279 0 279 1 1 0 1 0 8 0
amappl8 136 98 0 96 1 0 1 1 0 8 0
amappl7 128 149 0 136 1 0 1 1 0 8 0
amappl6 120 153 0 152 1 0 1 1 0 8 0
amappl5 112 125 0 114 1 0 1 1 0 8 0
amappl4 104 294 0 276 1 0 1 1 0 8 0
amappl3 96 2274 0 2148 4 0 4 4 0 8 0
amappl2 88 544 0 483 2 0 2 2 0 8 0
amappl1 80 10921 0 10321 14 0 14 14 0 8 1
amappl 88 3393 0 3212 5 0 5 5 0 92 0
uvmvnodes 80 101 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 8 0 0 1 0 1 1 0 8 0
uaddrrnd 24 563 0 532 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 563 0 532 1 0 1 1 0 8 0
vmmpekpl 168 6595 0 6560 2 0 2 2 0 8 0
vmmpepl 168 44581 0 42637 87 0 87 87 0 357 0
vmsppl 488 562 0 532 5 0 5 5 0 8 1
rwobjpl 80 15856 0 14796 24 1 23 24 0 8 0
pdppl 4096 1133 0 1064 91 20 71 79 0 8 2
pvpl 32 12432 0 0 101 0 101 101 0 265 0
pmappl 256 562 0 532 3 0 3 3 0 8 0
extentpl 40 45 0 27 1 0 1 1 0 8 0
phpool 112 444 0 23 13 0 13 13 0 8 0
ddb{1}> machine ddbcpu 0
Stopped at x86_ipi_db+0x27: addq $0x8,%rsp
x86_ipi_db(ffffffff83959ff0) 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(ffffffff83b24b80) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline]
__mp_lock(ffffffff83b24b80) at __mp_lock+0x192 sys/kern/kern_lock.c:173
__mp_acquire_count(ffffffff83b24b80,1) at __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1
sleep_finish(ffffffffffffffff,1) at sleep_finish+0x2d8 sys/kern/kern_synch.c:369
biowait(fffffc806a931cc8) at biowait+0xc6 sys/kern/vfs_bio.c:1110
bwrite(fffffc806a931cc8) at bwrite+0x359 sys/kern/vfs_bio.c:625
VOP_BWRITE(fffffc806a931cc8) at VOP_BWRITE+0x60 sys/kern/vfs_vops.c:648
ufs_direnter(fffffc806ab06550,fffffc80659f2888,ffff80002a34e440,ffff80002a34e770,fffffc806732a118) at ufs_direnter+0x7ac sys/ufs/ufs/ufs_lookup.c:833
ufs_mkdir(ffff80002a34e5e0) at ufs_mkdir+0x5d5 sys/ufs/ufs/ufs_vnops.c:1179
VOP_MKDIR(fffffc806ab06550,ffff80002a34e740,ffff80002a34e770,ffff80002a34e670) at VOP_MKDIR+0x101 sys/kern/vfs_vops.c:394
domkdirat(ffff807ffffef4d8,ffffff9c,7011df3dfd20,1ff) at domkdirat+0x179 sys/kern/vfs_syscalls.c:3062
syscall(ffff80002a34e8f0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80002a34e8f0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
end trace frame: 0xffff80002a34e970, count: 0
ddb{0}> trace
x86_ipi_db(ffffffff83959ff0) 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(ffffffff83b24b80) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline]
__mp_lock(ffffffff83b24b80) at __mp_lock+0x192 sys/kern/kern_lock.c:173
__mp_acquire_count(ffffffff83b24b80,1) at __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1
sleep_finish(ffffffffffffffff,1) at sleep_finish+0x2d8 sys/kern/kern_synch.c:369
biowait(fffffc806a931cc8) at biowait+0xc6 sys/kern/vfs_bio.c:1110
bwrite(fffffc806a931cc8) at bwrite+0x359 sys/kern/vfs_bio.c:625
VOP_BWRITE(fffffc806a931cc8) at VOP_BWRITE+0x60 sys/kern/vfs_vops.c:648
ufs_direnter(fffffc806ab06550,fffffc80659f2888,ffff80002a34e440,ffff80002a34e770,fffffc806732a118) at ufs_direnter+0x7ac sys/ufs/ufs/ufs_lookup.c:833
ufs_mkdir(ffff80002a34e5e0) at ufs_mkdir+0x5d5 sys/ufs/ufs/ufs_vnops.c:1179
VOP_MKDIR(fffffc806ab06550,ffff80002a34e740,ffff80002a34e770,ffff80002a34e670) at VOP_MKDIR+0x101 sys/kern/vfs_vops.c:394
domkdirat(ffff807ffffef4d8,ffffff9c,7011df3dfd20,1ff) at domkdirat+0x179 sys/kern/vfs_syscalls.c:3062
syscall(ffff80002a34e8f0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80002a34e8f0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7011df3dfdc0, count: -15
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(ffffffff8352a2a4) at panic+0x1e5 sys/kern/subr_prf.c:198
ip6_getpcbopt(0,33,fffffc8066d22800) at ip6_getpcbopt+0x3e3
ip6_ctloutput(0,ffff800010fdd790,29,33,fffffc8066d22800) at ip6_ctloutput+0xfb2 sys/netinet6/ip6_output.c:1487
sogetopt(ffff800010fdd790,29,33,fffffc8066d22800) at sogetopt+0x128 sys/kern/uipc_socket.c:2074
sys_getsockopt(ffff800037b95a18,ffff800039f9c080,ffff800039f9bfd0) at sys_getsockopt+0x1ec sys/kern/uipc_syscalls.c:1263
syscall(ffff800039f9c080) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff800039f9c080) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xb2608ddeab0, count: 7
ddb{1}> trace
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff8352a2a4) at panic+0x1e5 sys/kern/subr_prf.c:198
ip6_getpcbopt(0,33,fffffc8066d22800) at ip6_getpcbopt+0x3e3
ip6_ctloutput(0,ffff800010fdd790,29,33,fffffc8066d22800) at ip6_ctloutput+0xfb2 sys/netinet6/ip6_output.c:1487
sogetopt(ffff800010fdd790,29,33,fffffc8066d22800) at sogetopt+0x128 sys/kern/uipc_socket.c:2074
sys_getsockopt(ffff800037b95a18,ffff800039f9c080,ffff800039f9bfd0) at sys_getsockopt+0x1ec sys/kern/uipc_syscalls.c:1263
syscall(ffff800039f9c080) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff800039f9c080) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xb2608ddeab0, count: -8