panic: pool_do_get: mbufpl free list modified: page 0xfffffd806d6d6000; item addr 0xfffffd806d6d6700; offset 0x0=0x0 != 0x2943e482cb0b29ff Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 54868 32769 0 0 0 1 syz-executor.0 *168648 32769 0 0 0x4000000 0 syz-executor.0 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff824a00b6) at panic+0x164 sys/kern/subr_prf.c:218 pool_do_get(ffffffff828d47c8,2,ffff800021f02218) at pool_do_get+0x439 sys/kern/subr_pool.c:738 pool_get(ffffffff828d47c8,2) at pool_get+0xeb sys/kern/subr_pool.c:581 m_copym(fffffd80695f0100,0,3b9aca00,2) at m_copym+0x174 m_get sys/kern/uipc_mbuf.c:250 [inline] m_copym(fffffd80695f0100,0,3b9aca00,2) at m_copym+0x174 sys/kern/uipc_mbuf.c:667 ether_resolve(ffff80000017c2a8,fffffd80695f0100,fffffd806f6679c0,fffffd807addc0e0,ffff800021f023b8) at ether_resolve+0x49f sys/net/if_ethersubr.c:238 ether_output(ffff80000017c2a8,fffffd80695f0100,fffffd806f6679c0,fffffd807addc0e0) at ether_output+0x47 ether_encap sys/net/if_ethersubr.c:321 [inline] ether_output(ffff80000017c2a8,fffffd80695f0100,fffffd806f6679c0,fffffd807addc0e0) at ether_output+0x47 sys/net/if_ethersubr.c:350 ip_output(fffffd8069c01b00,0,fffffd806f6679b0,0,0,fffffd806f667940) at ip_output+0x12a2 sys/netinet/ip_output.c:509 udp_output(fffffd806f667940,fffffd8069c01b00,0,0) at udp_output+0x5af sys/netinet/udp_usrreq.c:1017 sosend(fffffd806ed08010,0,ffff800021f026e0,0,0,0) at sosend+0x671 sys/kern/uipc_socket.c:555 sendit(ffff8000ffff9168,6,ffff800021f027c0,0,ffff800021f028a0) at sendit+0x52b sys/kern/uipc_syscalls.c:657 sys_sendto(ffff8000ffff9168,ffff800021f02858,ffff800021f028a0) at sys_sendto+0x80 sys/kern/uipc_syscalls.c:522 syscall(ffff800021f02920) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800021f02920) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7128b2d8a30, count: 1 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 0xfffffd806d6d6000; item addr 0xfffffd806d6d6700; offset 0x0=0x0 != 0x2943e482cb0b29ff ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff824a00b6) at panic+0x164 sys/kern/subr_prf.c:218 pool_do_get(ffffffff828d47c8,2,ffff800021f02218) at pool_do_get+0x439 sys/kern/subr_pool.c:738 pool_get(ffffffff828d47c8,2) at pool_get+0xeb sys/kern/subr_pool.c:581 m_copym(fffffd80695f0100,0,3b9aca00,2) at m_copym+0x174 m_get sys/kern/uipc_mbuf.c:250 [inline] m_copym(fffffd80695f0100,0,3b9aca00,2) at m_copym+0x174 sys/kern/uipc_mbuf.c:667 ether_resolve(ffff80000017c2a8,fffffd80695f0100,fffffd806f6679c0,fffffd807addc0e0,ffff800021f023b8) at ether_resolve+0x49f sys/net/if_ethersubr.c:238 ether_output(ffff80000017c2a8,fffffd80695f0100,fffffd806f6679c0,fffffd807addc0e0) at ether_output+0x47 ether_encap sys/net/if_ethersubr.c:321 [inline] ether_output(ffff80000017c2a8,fffffd80695f0100,fffffd806f6679c0,fffffd807addc0e0) at ether_output+0x47 sys/net/if_ethersubr.c:350 ip_output(fffffd8069c01b00,0,fffffd806f6679b0,0,0,fffffd806f667940) at ip_output+0x12a2 sys/netinet/ip_output.c:509 udp_output(fffffd806f667940,fffffd8069c01b00,0,0) at udp_output+0x5af sys/netinet/udp_usrreq.c:1017 sosend(fffffd806ed08010,0,ffff800021f026e0,0,0,0) at sosend+0x671 sys/kern/uipc_socket.c:555 sendit(ffff8000ffff9168,6,ffff800021f027c0,0,ffff800021f028a0) at sendit+0x52b sys/kern/uipc_syscalls.c:657 sys_sendto(ffff8000ffff9168,ffff800021f02858,ffff800021f028a0) at sys_sendto+0x80 sys/kern/uipc_syscalls.c:522 syscall(ffff800021f02920) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800021f02920) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7128b2d8a30, count: -14 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff800021f02060 rbx 0xffff800021f02110 rdx 0x8b rcx 0x2 rax 0x1 r8 0xffff800021f02020 r9 0xffffffff8167b47f kprintf+0x16f r10 0x1 r11 0x58cf83a3afb21d26 r12 0x3000000008 r13 0xffff800021f02070 r14 0x100 r15 0x1 rip 0xffffffff8215e708 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800021f02050 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.0) pid=168648 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=71, nice=20 forw=0xffffffffffffffff, list=0xffff8000ffff8510,0xffffffff828c6de0 process=0xffff8000ffffb3b8 user=0xffff800021efd000, vmspace=0xfffffd806e903cf8 estcpu=36, cpticks=2, pctcpu=0.0 user=0, sys=2, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 32769 54868 9096 0 7 0 syz-executor.0 *32769 168648 9096 0 7 0x4000000 syz-executor.0 2206 183248 0 0 3 0x14200 acct acct 11637 292908 91051 0 3 0x82 nanosleep syz-executor.1 9096 457932 91051 0 3 0x82 nanosleep syz-executor.0 91051 166469 96997 0 3 0x82 thrsleep syz-fuzzer 91051 12981 96997 0 3 0x4000082 thrsleep syz-fuzzer 91051 110460 96997 0 3 0x4000082 thrsleep syz-fuzzer 91051 480376 96997 0 3 0x4000082 thrsleep syz-fuzzer 91051 248018 96997 0 3 0x4000082 thrsleep syz-fuzzer 91051 244939 96997 0 3 0x4000082 thrsleep syz-fuzzer 91051 289723 96997 0 3 0x4000082 kqread syz-fuzzer 91051 429006 96997 0 3 0x4000082 thrsleep syz-fuzzer 96997 57039 42157 0 3 0x10008a pause ksh 42157 44679 65787 0 3 0x92 select sshd 96972 162502 1 0 3 0x100083 ttyin getty 65787 139887 1 0 3 0x80 select sshd 74459 336494 79083 74 3 0x100092 bpf pflogd 79083 515839 1 0 3 0x80 netio pflogd 6617 145813 37486 73 3 0x100090 kqread syslogd 37486 360018 1 0 3 0x100082 netio syslogd 17261 471058 1 77 3 0x100090 poll dhclient 53754 82595 1 0 3 0x80 poll dhclient 62760 478114 0 0 3 0x14200 bored smr 33014 57307 0 0 2 0x14200 zerothread 52229 242857 0 0 3 0x14200 aiodoned aiodoned 44523 331073 0 0 3 0x14200 syncer update 26066 85112 0 0 3 0x14200 cleaner cleaner 50270 456050 0 0 3 0x14200 reaper reaper 35780 180214 0 0 3 0x14200 pgdaemon pagedaemon 97500 119923 0 0 3 0x14200 bored crynlk 79436 82154 0 0 3 0x14200 bored crypto 70184 41341 0 0 3 0x40014200 acpi0 acpi0 1025 303385 0 0 3 0x40014200 idle1 17216 66953 0 0 2 0x14200 softnet 9633 458634 0 0 3 0x14200 bored systqmp 65423 411961 0 0 3 0x14200 bored systq 89741 46590 0 0 2 0x40014200 softclock 91746 505628 0 0 3 0x40014200 idle0 1 292595 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 (0xffffffff828d47d8) #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_copym+0x174 m_get sys/kern/uipc_mbuf.c:250 [inline] #4 m_copym+0x174 sys/kern/uipc_mbuf.c:667 #5 ether_resolve+0x49f sys/net/if_ethersubr.c:238 #6 ether_output+0x47 ether_encap sys/net/if_ethersubr.c:321 [inline] #6 ether_output+0x47 sys/net/if_ethersubr.c:350 #7 ip_output+0x12a2 sys/netinet/ip_output.c:509 #8 udp_output+0x5af sys/netinet/udp_usrreq.c:1017 #9 sosend+0x671 sys/kern/uipc_socket.c:555 #10 sendit+0x52b sys/kern/uipc_syscalls.c:657 #11 sys_sendto+0x80 sys/kern/uipc_syscalls.c:522 #12 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] #12 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 #13 Xsyscall+0x128 Process 32769 (syz-executor.0) thread 0xffff8000ffff9168 (168648) exclusive rwlock netlock r = 0 (0xffffffff82780fa0) #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 (0xffffffff828d47d8) #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_copym+0x174 m_get sys/kern/uipc_mbuf.c:250 [inline] #4 m_copym+0x174 sys/kern/uipc_mbuf.c:667 #5 ether_resolve+0x49f sys/net/if_ethersubr.c:238 #6 ether_output+0x47 ether_encap sys/net/if_ethersubr.c:321 [inline] #6 ether_output+0x47 sys/net/if_ethersubr.c:350 #7 ip_output+0x12a2 sys/netinet/ip_output.c:509 #8 udp_output+0x5af sys/netinet/udp_usrreq.c:1017 #9 sosend+0x671 sys/kern/uipc_socket.c:555 #10 sendit+0x52b sys/kern/uipc_syscalls.c:657 #11 sys_sendto+0x80 sys/kern/uipc_syscalls.c:522 #12 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] #12 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 #13 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 9479 6526K 6727K 78643K 10677 0 pcb 13 8K 8K 78643K 35 0 rtable 115 5K 5K 78643K 283 0 ifaddr 46 11K 12K 78643K 71 0 sysctl 2 0K 0K 78643K 2 0 counters 43 33K 34K 78643K 45 0 ioctlops 0 0K 4K 78643K 1510 0 mount 1 1K 1K 78643K 1 0 vnodes 1222 77K 77K 78643K 1262 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 1K 78643K 2 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 30 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1824 197K 290K 78643K 13058 0 file desc 5 13K 25K 78643K 149 0 proc 60 63K 83K 78643K 444 0 subproc 32 2K 2K 78643K 34 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 7 0 in_multi 37 2K 2K 78643K 74 0 ether_multi 1 0K 0K 78643K 3 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 31 148K 148K 78643K 31 0 exec 0 0K 1K 78643K 212 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 159 26K 26K 78643K 1453 0 UVM aobj 3 2K 2K 78643K 3 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 8 0 NDP 6 0K 0K 78643K 13 0 temp 70 3862K 3926K 78643K 2968 0 kqueue 3 4K 8K 78643K 5 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 6 0 0 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 88 30 0 27 1 0 1 1 0 8 0 rtentry 112 50 0 5 2 0 2 2 0 8 0 unpcb 120 378 0 363 1 0 1 1 0 8 0 syncache 272 4 0 4 1 1 0 1 0 8 0 tcpqe 32 872 0 872 2 1 1 1 0 8 1 tcpcb 592 43 0 28 2 0 2 2 0 8 0 inpcb 296 175 0 166 2 0 2 2 0 8 1 nd6 48 9 0 2 1 0 1 1 0 8 0 pffrag 232 3 0 2 1 0 1 1 0 482 0 pffrnode 88 3 0 2 1 0 1 1 0 8 0 pffrent 40 43 0 4 1 0 1 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 15 0 13 1 0 1 1 0 8 0 pfstitem 24 27 0 0 1 0 1 1 0 8 0 pfstkey 112 27 0 0 1 0 1 1 0 8 0 pfstate 328 27 0 0 3 0 3 3 0 8 0 pfrule 1360 26 0 20 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 195 0 0 13 0 13 13 0 8 0 art_table 32 196 0 0 2 0 2 2 0 8 0 art_node 16 49 0 8 1 0 1 1 0 8 0 semupl 112 2 0 2 1 0 1 1 0 8 1 semapl 112 28 0 18 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1596 0 189 89 0 89 89 0 8 0 ffsino 272 1596 0 189 95 1 94 94 0 8 0 nchpl 144 2048 0 440 60 0 60 60 0 8 0 uvmvnodes 72 1668 0 0 31 0 31 31 0 8 0 vnodes 208 1668 0 0 88 0 88 88 0 8 0 namei 1024 5401 0 5401 2 1 1 1 0 8 1 percpumem 16 33 0 1 1 0 1 1 0 8 0 vmpool 560 2 0 2 1 0 1 1 0 8 1 pfiaddrpl 120 5 0 4 1 0 1 1 0 8 0 scxspl 200 5735 0 5735 8 1 7 7 0 8 7 plimitpl 152 22 0 14 1 0 1 1 0 8 0 sigapl 424 365 0 333 4 0 4 4 0 8 0 futexpl 56 1881 0 1881 1 0 1 1 0 8 1 knotepl 112 64 0 44 1 0 1 1 0 8 0 kqueuepl 152 22 0 20 1 0 1 1 0 8 0 pipepl 304 93 0 82 2 0 2 2 0 8 1 fdescpl 496 349 0 333 3 0 3 3 0 8 0 filepl 152 2144 0 2035 7 2 5 5 0 8 0 lockfpl 104 20 0 19 1 0 1 1 0 8 0 lockfspl 48 11 0 10 1 0 1 1 0 8 0 sessionpl 120 18 0 7 1 0 1 1 0 8 0 pgrppl 48 18 0 7 1 0 1 1 0 8 0 ucredpl 96 128 0 119 1 0 1 1 0 8 0 zombiepl 144 333 0 332 2 1 1 1 0 8 0 processpl 1008 365 0 332 5 0 5 5 0 8 0 procpl 632 635 0 594 5 1 4 4 0 8 0 srpgc 72 2 0 2 1 0 1 1 0 8 1 sockpl 400 583 0 556 4 0 4 4 0 8 1 mcl64k 65536 1 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 1 0 0 1 0 1 1 0 8 0 mcl4k 4096 5 0 0 1 0 1 1 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 249 0 0 31 0 31 31 0 8 1 mtagpl 96 6 0 0 1 0 1 1 0 8 0 mbufpl 256 264 0 0 16 0 16 16 0 8 0 mbufpl: pool(0xffffffff828d47c8:mbufpl): free list modified: page 0xfffffd806d6d6000; item ordinal 0; addr 0xfffffd806d6d6700 (p 0xfffffd806ed07000); offset 0x0=0x0 pool(mbufpl): free list modified: page 0xfffffd806d6d6000; item ordinal 0; addr 0xfffffd806d6d6700 (p 0xfffffd806ed07000); offset 0x0=0x0 mbufpl: pool(0xffffffff828d47c8:mbufpl): page inconsistency: page 0xfffffd806d6d6000; item ordinal 1; addr 0x8889cae86ea09882 bufpl 280 3443 0 126 237 0 237 237 0 8 0 anonpl 16 48928 0 30729 75 1 74 74 0 124 0 amapchunkpl 152 1982 0 1678 15 0 15 15 0 158 0 amappl16 192 1363 0 525 43 0 43 43 0 8 0 amappl15 184 1 0 0 1 0 1 1 0 8 0 amappl14 176 55 0 54 1 0 1 1 0 8 0 amappl13 168 89 0 84 1 0 1 1 0 8 0 amappl12 160 84 0 79 1 0 1 1 0 8 0 amappl11 152 112 0 95 1 0 1 1 0 8 0 amappl10 144 23 0 17 1 0 1 1 0 8 0 amappl9 136 367 0 366 1 0 1 1 0 8 0 amappl8 128 334 0 302 2 0 2 2 0 8 0 amappl7 120 118 0 105 1 0 1 1 0 8 0 amappl6 112 35 0 27 1 0 1 1 0 8 0 amappl5 104 133 0 119 1 0 1 1 0 8 0 amappl4 96 598 0 570 1 0 1 1 0 8 0 amappl3 88 238 0 224 1 0 1 1 0 8 0 amappl2 80 1850 0 1781 2 0 2 2 0 8 0 amappl1 72 18685 0 18244 23 12 11 18 0 8 1 amappl 80 937 0 857 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 2 0 0 1 0 1 1 0 8 0 uaddrrnd 24 351 0 335 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 351 0 335 1 0 1 1 0 8 0 vmmpekpl 168 6674 0 6643 2 0 2 2 0 8 0 vmmpepl 168 51000 0 48971 115 7 108 108 0 357 14 vmsppl 368 350 0 335 2 0 2 2 0 8 0 pdppl 4096 709 0 670 6 0 6 6 0 8 0 pvpl 32 164591 0 143203 177 2 175 175 0 265 1 pmappl 232 350 0 335 3 1 2 2 0 8 1 extentpl 40 53 0 36 1 0 1 1 0 8 0 phpool 112 270 0 6 8 0 8 8 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(ffffffff824a00b6) at panic+0x164 sys/kern/subr_prf.c:218 pool_do_get(ffffffff828d47c8,2,ffff800021f02218) at pool_do_get+0x439 sys/kern/subr_pool.c:738 pool_get(ffffffff828d47c8,2) at pool_get+0xeb sys/kern/subr_pool.c:581 m_copym(fffffd80695f0100,0,3b9aca00,2) at m_copym+0x174 m_get sys/kern/uipc_mbuf.c:250 [inline] m_copym(fffffd80695f0100,0,3b9aca00,2) at m_copym+0x174 sys/kern/uipc_mbuf.c:667 ether_resolve(ffff80000017c2a8,fffffd80695f0100,fffffd806f6679c0,fffffd807addc0e0,ffff800021f023b8) at ether_resolve+0x49f sys/net/if_ethersubr.c:238 ether_output(ffff80000017c2a8,fffffd80695f0100,fffffd806f6679c0,fffffd807addc0e0) at ether_output+0x47 ether_encap sys/net/if_ethersubr.c:321 [inline] ether_output(ffff80000017c2a8,fffffd80695f0100,fffffd806f6679c0,fffffd807addc0e0) at ether_output+0x47 sys/net/if_ethersubr.c:350 ip_output(fffffd8069c01b00,0,fffffd806f6679b0,0,0,fffffd806f667940) at ip_output+0x12a2 sys/netinet/ip_output.c:509 udp_output(fffffd806f667940,fffffd8069c01b00,0,0) at udp_output+0x5af sys/netinet/udp_usrreq.c:1017 sosend(fffffd806ed08010,0,ffff800021f026e0,0,0,0) at sosend+0x671 sys/kern/uipc_socket.c:555 sendit(ffff8000ffff9168,6,ffff800021f027c0,0,ffff800021f028a0) at sendit+0x52b sys/kern/uipc_syscalls.c:657 sys_sendto(ffff8000ffff9168,ffff800021f02858,ffff800021f028a0) at sys_sendto+0x80 sys/kern/uipc_syscalls.c:522 syscall(ffff800021f02920) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800021f02920) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7128b2d8a30, count: -14 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 userret(ffff8000ffff8510) at userret+0xba sys/kern/kern_sig.c:1870 syscall(ffff800020eee160) at syscall+0x55f mi_syscall_return sys/sys/syscall_mi.h:129 [inline] syscall(ffff800020eee160) at syscall+0x55f sys/arch/amd64/amd64/trap.c:592 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffee0e0, count: 9 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 userret(ffff8000ffff8510) at userret+0xba sys/kern/kern_sig.c:1870 syscall(ffff800020eee160) at syscall+0x55f mi_syscall_return sys/sys/syscall_mi.h:129 [inline] syscall(ffff800020eee160) at syscall+0x55f sys/arch/amd64/amd64/trap.c:592 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffee0e0, count: -6