panic: pool_do_get: mbufpl free list modified: page 0xfffffd806d856000; item addr 0xfffffd806d856900; offset 0x0=0x0 != 0xbd1e397586cf1bde Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND * 62523 75777 0 0 0x4000000 0 syz-executor.1 103178 58184 0 0x2 0x4000000 1 syz-fuzzer db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff824994f0) at panic+0x164 sys/kern/subr_prf.c:218 pool_do_get(ffffffff828f8c38,2,ffff8000230ecf68) at pool_do_get+0x439 sys/kern/subr_pool.c:738 pool_get(ffffffff828f8c38,2) at pool_get+0xeb sys/kern/subr_pool.c:581 m_gethdr(2,2) at m_gethdr+0x4c sys/kern/uipc_mbuf.c:283 ip6_fragment(fffffd8068f75e00,28,11,500) at ip6_fragment+0xec sys/netinet6/ip6_output.c:810 ip6_output(fffffd8068f75e00,0,fffffd806f686510,0,0,fffffd806f6864a0) at ip6_output+0x1ba2 sys/netinet6/ip6_output.c:736 udp6_output(fffffd806f6864a0,fffffd8073ac7100,0,0) at udp6_output+0x36a sys/netinet6/udp6_output.c:236 sosend(fffffd80082c5370,0,ffff8000230ed490,0,0,8a) at sosend+0x671 sys/kern/uipc_socket.c:555 sendit(ffff800023fa8ec8,7,ffff8000230ed570,a,ffff8000230ed650) at sendit+0x52b sys/kern/uipc_syscalls.c:657 sys_sendto(ffff800023fa8ec8,ffff8000230ed608,ffff8000230ed650) at sys_sendto+0x80 sys/kern/uipc_syscalls.c:522 syscall(ffff8000230ed6d0) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000230ed6d0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x8d5ee1b4b10, count: 2 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 pool_do_get: mbufpl free list modified: page 0xfffffd806d856000; item addr 0xfffffd806d856900; offset 0x0=0x0 != 0xbd1e397586cf1bde ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff824994f0) at panic+0x164 sys/kern/subr_prf.c:218 pool_do_get(ffffffff828f8c38,2,ffff8000230ecf68) at pool_do_get+0x439 sys/kern/subr_pool.c:738 pool_get(ffffffff828f8c38,2) at pool_get+0xeb sys/kern/subr_pool.c:581 m_gethdr(2,2) at m_gethdr+0x4c sys/kern/uipc_mbuf.c:283 ip6_fragment(fffffd8068f75e00,28,11,500) at ip6_fragment+0xec sys/netinet6/ip6_output.c:810 ip6_output(fffffd8068f75e00,0,fffffd806f686510,0,0,fffffd806f6864a0) at ip6_output+0x1ba2 sys/netinet6/ip6_output.c:736 udp6_output(fffffd806f6864a0,fffffd8073ac7100,0,0) at udp6_output+0x36a sys/netinet6/udp6_output.c:236 sosend(fffffd80082c5370,0,ffff8000230ed490,0,0,8a) at sosend+0x671 sys/kern/uipc_socket.c:555 sendit(ffff800023fa8ec8,7,ffff8000230ed570,a,ffff8000230ed650) at sendit+0x52b sys/kern/uipc_syscalls.c:657 sys_sendto(ffff800023fa8ec8,ffff8000230ed608,ffff8000230ed650) at sys_sendto+0x80 sys/kern/uipc_syscalls.c:522 syscall(ffff8000230ed6d0) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000230ed6d0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x8d5ee1b4b10, count: -13 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff8000230ecdb0 rbx 0xffff8000230ece60 rdx 0x8b rcx 0x2 rax 0x1 r8 0xffffffff822ff92f kprintf+0x16f r9 0x1 r10 0x2 r11 0x37847cb0f1af76a5 r12 0x3000000008 r13 0xffff8000230ecdc0 r14 0x100 r15 0x1 rip 0xffffffff81f09538 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff8000230ecda0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.1) pid=62523 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800023fa8508,0xffffffff8292fce0 process=0xffff800020df0f90 user=0xffff8000230e8000, vmspace=0xfffffd807efff730 estcpu=36, cpticks=2, pctcpu=0.0 user=0, sys=2, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 75777 102912 21063 0 2 0 syz-executor.1 *75777 62523 21063 0 7 0x4000000 syz-executor.1 7477 116589 1 0 3 0x100083 ttyin getty 21063 231456 58184 0 3 0x82 nanosleep syz-executor.1 5086 252762 0 0 3 0x14200 bored sosplice 45067 73819 0 0 3 0x14280 nfsidl nfsio 21959 424915 0 0 3 0x14280 nfsidl nfsio 23125 45419 0 0 3 0x14280 nfsidl nfsio 70372 83885 0 0 3 0x14280 nfsidl nfsio 89747 385956 0 0 3 0x14280 nfsidl nfsio 59718 443353 0 0 3 0x14280 nfsidl nfsio 81687 247930 0 0 3 0x14280 nfsidl nfsio 60205 115935 0 0 3 0x14280 nfsidl nfsio 25030 41795 0 0 3 0x14280 nfsidl nfsio 88359 18098 0 0 3 0x14280 nfsidl nfsio 40873 314247 0 0 3 0x14280 nfsidl nfsio 16236 134663 0 0 3 0x14280 nfsidl nfsio 804 69896 0 0 3 0x14280 nfsidl nfsio 33068 355029 0 0 3 0x14280 nfsidl nfsio 26110 372521 0 0 3 0x14280 nfsidl nfsio 73570 137564 0 0 3 0x14280 nfsidl nfsio 21006 325619 0 0 3 0x14280 nfsidl nfsio 33382 53803 0 0 3 0x14280 nfsidl nfsio 71625 84506 0 0 3 0x14280 nfsidl nfsio 56760 66689 0 0 3 0x14280 nfsidl nfsio 33073 410066 58184 0 3 0x82 piperd syz-executor.0 58184 98664 5381 0 3 0x82 thrsleep syz-fuzzer 58184 362729 5381 0 3 0x4000082 nanosleep syz-fuzzer 58184 177586 5381 0 3 0x4000082 thrsleep syz-fuzzer 58184 252274 5381 0 3 0x4000082 thrsleep syz-fuzzer 58184 369693 5381 0 3 0x4000082 thrsleep syz-fuzzer 58184 103178 5381 0 7 0x4000002 syz-fuzzer 58184 80012 5381 0 3 0x4000082 thrsleep syz-fuzzer 58184 333425 5381 0 3 0x4000082 thrsleep syz-fuzzer 58184 74982 5381 0 3 0x4000082 kqread syz-fuzzer 58184 467284 5381 0 3 0x4000082 thrsleep syz-fuzzer 58184 383956 5381 0 3 0x4000082 thrsleep syz-fuzzer 5381 345366 20802 0 3 0x10008a pause ksh 20802 249825 95006 0 3 0x92 select sshd 95006 103217 1 0 3 0x80 select sshd 23703 25318 15599 74 3 0x100092 bpf pflogd 15599 68555 1 0 3 0x80 netio pflogd 71912 121436 64482 73 3 0x100090 kqread syslogd 64482 28173 1 0 3 0x100082 netio syslogd 22660 201624 1 77 3 0x100090 poll dhclient 32117 456822 1 0 3 0x80 poll dhclient 89298 297618 0 0 3 0x14200 bored smr 6137 356622 0 0 2 0x14200 zerothread 81413 191855 0 0 3 0x14200 aiodoned aiodoned 46042 462398 0 0 3 0x14200 syncer update 26072 302770 0 0 3 0x14200 cleaner cleaner 85886 402948 0 0 3 0x14200 reaper reaper 26985 470279 0 0 3 0x14200 pgdaemon pagedaemon 50882 490497 0 0 3 0x14200 bored crynlk 19660 253156 0 0 3 0x14200 bored crypto 71636 337065 0 0 3 0x40014200 acpi0 acpi0 61658 373814 0 0 3 0x40014200 idle1 13475 280382 0 0 3 0x14200 bored softnet 21243 33954 0 0 3 0x14200 bored systqmp 84842 467894 0 0 3 0x14200 bored systq 38557 148120 0 0 3 0x40014200 bored softclock 90196 167211 0 0 3 0x40014200 idle0 1 55364 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks CPU 0: exclusive mutex mbufpl r = 0 (0xffffffff828f8c48) #0 witness_lock+0x4c7 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4c7 sys/kern/subr_witness.c:1164 #1 mtx_enter_try+0x102 #2 mtx_enter+0x4b sys/kern/kern_lock.c:266 #3 pool_get+0xbf sys/kern/subr_pool.c:578 #4 m_gethdr+0x4c sys/kern/uipc_mbuf.c:283 #5 ip6_fragment+0xec sys/netinet6/ip6_output.c:810 #6 ip6_output+0x1ba2 sys/netinet6/ip6_output.c:736 #7 udp6_output+0x36a sys/netinet6/udp6_output.c:236 #8 sosend+0x671 sys/kern/uipc_socket.c:555 #9 sendit+0x52b sys/kern/uipc_syscalls.c:657 #10 sys_sendto+0x80 sys/kern/uipc_syscalls.c:522 #11 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] #11 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 #12 Xsyscall+0x128 Process 75777 (syz-executor.1) thread 0xffff800023fa8ec8 (62523) exclusive rwlock netlock r = 0 (0xffffffff82726938) #0 witness_lock+0x4c7 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4c7 sys/kern/subr_witness.c:1164 #1 solock+0x5a sys/kern/uipc_socket2.c:282 #2 sosend+0x559 sys/kern/uipc_socket.c:543 #3 sendit+0x52b sys/kern/uipc_syscalls.c:657 #4 sys_sendto+0x80 sys/kern/uipc_syscalls.c:522 #5 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] #5 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 #6 Xsyscall+0x128 exclusive mutex mbufpl r = 0 (0xffffffff828f8c48) #0 witness_lock+0x4c7 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4c7 sys/kern/subr_witness.c:1164 #1 mtx_enter_try+0x102 #2 mtx_enter+0x4b sys/kern/kern_lock.c:266 #3 pool_get+0xbf sys/kern/subr_pool.c:578 #4 m_gethdr+0x4c sys/kern/uipc_mbuf.c:283 #5 ip6_fragment+0xec sys/netinet6/ip6_output.c:810 #6 ip6_output+0x1ba2 sys/netinet6/ip6_output.c:736 #7 udp6_output+0x36a sys/netinet6/udp6_output.c:236 #8 sosend+0x671 sys/kern/uipc_socket.c:555 #9 sendit+0x52b sys/kern/uipc_syscalls.c:657 #10 sys_sendto+0x80 sys/kern/uipc_syscalls.c:522 #11 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] #11 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 #12 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 9512 6420K 6729K 78643K 11521 0 pcb 13 8K 8K 78643K 426 0 rtable 111 7K 9K 78643K 586 0 ifaddr 83 17K 17K 78643K 232 0 sysctl 2 0K 0K 78643K 2 0 counters 43 33K 34K 78643K 79 0 ioctlops 0 0K 4K 78643K 1594 0 iov 0 0K 16K 78643K 66 0 mount 1 1K 1K 78643K 1 0 vnodes 1214 76K 77K 78643K 1554 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 19 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 1K 78643K 203 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1824 197K 290K 78643K 13058 0 file desc 5 13K 25K 78643K 1176 0 sigio 0 0K 0K 78643K 63 0 proc 62 63K 95K 78643K 564 0 subproc 32 2K 2K 78643K 51 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 77 0 in_multi 101 4K 4K 78643K 223 0 ether_multi 1 0K 0K 78643K 17 0 mrt 0 0K 0K 78643K 5 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 55 254K 254K 78643K 55 0 exec 0 0K 1K 78643K 283 0 pagedep 1 8K 8K 78643K 1 0 inodedep 1 32K 32K 78643K 1 0 newblk 1 0K 0K 78643K 1 0 VM swap 7 26K 26K 78643K 7 0 UVM amap 119 22K 38K 78643K 4537 0 UVM aobj 57 6K 6K 78643K 63 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 97 0 NDP 11 0K 0K 78643K 44 0 temp 132 3872K 4426K 78643K 15577 0 kqueue 3 4K 22K 78643K 43 0 SYN cache 2 16K 16K 78643K 2 0 ddb{0}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle arp 64 11 0 2 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 84 0 82 1 0 1 1 0 8 0 rtentry 112 92 0 55 2 0 2 2 0 8 0 unpcb 120 3293 0 3279 1 0 1 1 0 8 0 syncache 264 6 0 6 2 2 0 1 0 8 0 tcpqe 32 462 0 462 2 2 0 1 0 8 0 tcpcb 544 208 0 199 3 2 1 2 0 8 0 ipq 40 275 0 275 5 4 1 1 0 8 1 ipqe 40 550 0 550 5 4 1 1 0 8 1 inpcb 296 3137 0 3126 6 4 2 2 0 8 1 rttmr 72 1 0 1 1 1 0 1 0 8 0 nd6 48 20 0 16 1 0 1 1 0 8 0 pkpcb 40 6 0 6 1 1 0 1 0 8 0 ppxss 1136 3 0 3 3 2 1 1 0 8 1 pfstscr 40 1 0 1 1 1 0 1 0 8 0 pffrag 232 4 0 4 3 3 0 1 0 482 0 pffrnode 88 4 0 4 3 3 0 1 0 8 0 pffrent 40 55 0 55 4 4 0 1 0 8 0 pfosfp 40 846 0 423 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pfrktable 1344 44 0 37 4 3 1 1 0 8 0 pfstitem 24 27 0 25 1 0 1 1 0 8 0 pfstkey 112 27 0 25 1 0 1 1 0 8 0 pfstate 328 26 0 24 2 1 1 2 0 8 0 pfrule 1360 37 0 31 2 1 1 2 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 357 0 183 13 2 11 13 0 8 0 art_table 32 359 0 183 2 0 2 2 0 8 0 art_node 16 86 0 56 1 0 1 1 0 8 0 sysvmsgpl 40 21 0 5 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 193 0 183 1 0 1 1 0 8 0 shmpl 112 60 0 6 2 0 2 2 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 2808 0 1406 89 0 89 89 0 8 0 ffsino 272 2808 0 1406 95 1 94 94 0 8 0 nchpl 144 4741 0 3145 60 0 60 60 0 8 0 uvmvnodes 72 3092 0 0 57 0 57 57 0 8 0 vnodes 208 3092 0 0 163 0 163 163 0 8 0 namei 1024 12278 0 12278 5 4 1 1 0 8 1 percpumem 16 50 0 18 1 0 1 1 0 8 0 vmpool 560 2 0 2 1 1 0 1 0 8 0 pfiaddrpl 120 17 0 11 4 3 1 1 0 8 0 scsiplug 64 2 0 2 2 1 1 1 0 8 1 scxspl 192 13109 0 13109 11 10 1 7 0 8 1 plimitpl 152 54 0 46 1 0 1 1 0 8 0 sigapl 424 1411 0 1359 6 0 6 6 0 8 0 futexpl 56 22194 0 22194 3 2 1 1 0 8 1 knotepl 112 181 0 162 2 0 2 2 0 8 1 kqueuepl 144 123 0 120 1 0 1 1 0 8 0 pipepl 304 221 0 211 3 2 1 2 0 8 0 fdescpl 496 1375 0 1359 3 0 3 3 0 8 0 filepl 152 11260 0 11153 7 2 5 6 0 8 0 lockfpl 104 176 0 175 1 0 1 1 0 8 0 lockfspl 48 58 0 57 1 0 1 1 0 8 0 sessionpl 112 21 0 10 1 0 1 1 0 8 0 pgrppl 48 32 0 21 1 0 1 1 0 8 0 ucredpl 96 606 0 597 1 0 1 1 0 8 0 zombiepl 144 1359 0 1359 4 3 1 1 0 8 1 processpl 992 1411 0 1359 8 1 7 7 0 8 0 procpl 624 3724 0 3661 6 0 6 6 0 8 0 srpgc 64 2 0 2 1 1 0 1 0 8 0 sosppl 128 9 0 9 5 4 1 1 0 8 1 sockpl 400 6548 0 6521 11 7 4 4 0 8 1 mcl64k 65536 264 0 0 33 8 25 33 0 8 0 mcl16k 16384 3 0 0 1 0 1 1 0 8 0 mcl12k 12288 12 0 0 2 0 2 2 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 9 0 0 2 0 2 2 0 8 0 mcl2k2 2112 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 256 0 0 31 0 31 31 0 8 0 mtagpl 96 38 0 0 1 0 1 1 0 8 0 mbufpl 256 446 0 0 23 0 23 23 0 8 0 mbufpl: pool(0xffffffff828f8c38:mbufpl): free list modified: page 0xfffffd806d856000; item ordinal 0; addr 0xfffffd806d856900 (p 0xfffffd806ddd6000); offset 0x0=0x0 pool(mbufpl): free list modified: page 0xfffffd806d856000; item ordinal 0; addr 0xfffffd806d856900 (p 0xfffffd806ddd6000); offset 0x0=0x0 mbufpl: pool(0xffffffff828f8c38:mbufpl): page inconsistency: page 0xfffffd806d856000; item ordinal 1; addr 0x1bc9314d09e38f7c bufpl 280 5081 0 134 354 0 354 354 0 8 0 anonpl 16 159378 0 141982 135 56 79 87 0 124 7 amapchunkpl 152 8325 0 8171 33 13 20 20 0 158 13 amappl16 192 6132 0 5165 101 52 49 59 0 8 0 amappl15 184 167 0 166 2 1 1 1 0 8 0 amappl14 176 790 0 783 1 0 1 1 0 8 0 amappl13 168 35 0 32 1 0 1 1 0 8 0 amappl12 160 6 0 4 1 0 1 1 0 8 0 amappl11 152 810 0 795 1 0 1 1 0 8 0 amappl10 144 189 0 184 1 0 1 1 0 8 0 amappl9 136 597 0 594 1 0 1 1 0 8 0 amappl8 128 586 0 555 3 1 2 2 0 8 0 amappl7 120 124 0 112 1 0 1 1 0 8 0 amappl6 112 779 0 775 2 1 1 1 0 8 0 amappl5 104 521 0 502 1 0 1 1 0 8 0 amappl4 96 1270 0 1243 1 0 1 1 0 8 0 amappl3 88 135 0 128 1 0 1 1 0 8 0 amappl2 80 10260 0 10186 2 0 2 2 0 8 0 amappl1 72 49280 0 48831 23 13 10 18 0 8 0 amappl 80 3958 0 3913 2 0 2 2 0 84 0 dma4096 4096 1 0 1 1 1 0 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 64 62 0 6 1 0 1 1 0 8 0 uaddrrnd 24 1377 0 1361 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1377 0 1361 1 0 1 1 0 8 0 vmmpekpl 168 14269 0 14229 2 0 2 2 0 8 0 vmmpepl 168 182611 0 180475 192 76 116 131 0 357 22 vmsppl 368 1376 0 1361 2 0 2 2 0 8 0 pdppl 4096 2761 0 2722 7 1 6 6 0 8 0 pvpl 32 453823 0 433077 286 98 188 205 0 265 18 pmappl 232 1376 0 1361 3 2 1 2 0 8 0 extentpl 40 53 0 36 1 0 1 1 0 8 0 phpool 112 331 0 28 9 0 9 9 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff824994f0) at panic+0x164 sys/kern/subr_prf.c:218 pool_do_get(ffffffff828f8c38,2,ffff8000230ecf68) at pool_do_get+0x439 sys/kern/subr_pool.c:738 pool_get(ffffffff828f8c38,2) at pool_get+0xeb sys/kern/subr_pool.c:581 m_gethdr(2,2) at m_gethdr+0x4c sys/kern/uipc_mbuf.c:283 ip6_fragment(fffffd8068f75e00,28,11,500) at ip6_fragment+0xec sys/netinet6/ip6_output.c:810 ip6_output(fffffd8068f75e00,0,fffffd806f686510,0,0,fffffd806f6864a0) at ip6_output+0x1ba2 sys/netinet6/ip6_output.c:736 udp6_output(fffffd806f6864a0,fffffd8073ac7100,0,0) at udp6_output+0x36a sys/netinet6/udp6_output.c:236 sosend(fffffd80082c5370,0,ffff8000230ed490,0,0,8a) at sosend+0x671 sys/kern/uipc_socket.c:555 sendit(ffff800023fa8ec8,7,ffff8000230ed570,a,ffff8000230ed650) at sendit+0x52b sys/kern/uipc_syscalls.c:657 sys_sendto(ffff800023fa8ec8,ffff8000230ed608,ffff8000230ed650) at sys_sendto+0x80 sys/kern/uipc_syscalls.c:522 syscall(ffff8000230ed6d0) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000230ed6d0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x8d5ee1b4b10, count: -13 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp x86_ipi_db(ffff800020d70ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:352 x86_ipi_handler() at x86_ipi_handler+0xc6 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23 end of kernel end trace frame: 0xc002ebaae8, count: 12 ddb{1}> trace x86_ipi_db(ffff800020d70ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:352 x86_ipi_handler() at x86_ipi_handler+0xc6 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23 end of kernel end trace frame: 0xc002ebaae8, count: -3