panic: tcp_output Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *169149 13125 0 0 0x4000000 1 syz-executor.2 306534 83548 0 0x14000 0x200 0 reaper db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8257e290) at panic+0x177 sys/kern/subr_prf.c:198 tcp_output(ffff800000c2e308) at tcp_output+0x2cd2 sys/netinet/tcp_output.c:727 tcp_send(fffffd806f2b23d8,fffffd80693b1800,0,fffffd806a83a800) at tcp_send+0xc4 sys/netinet/tcp_usrreq.c:953 sosend(fffffd806f2b23d8,0,ffff80002921c160,0,fffffd806a83a800,0) at sosend+0x62a pru_send sys/sys/protosw.h:331 [inline] sosend(fffffd806f2b23d8,0,ffff80002921c160,0,fffffd806a83a800,0) at sosend+0x62a sys/kern/uipc_socket.c:646 sendit(ffff80002d83fa50,6,ffff80002921c2e0,0,ffff80002921c3d0) at sendit+0x65d sys/kern/uipc_syscalls.c:694 sys_sendmsg(ffff80002d83fa50,ffff80002921c388,ffff80002921c3d0) at sys_sendmsg+0x198 sys/kern/uipc_syscalls.c:601 syscall(ffff80002921c450) at syscall+0x4c3 mi_syscall sys/sys/syscall_mi.h:101 [inline] syscall(ffff80002921c450) at syscall+0x4c3 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xaa31d184260, count: 6 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: tcp_output ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8257e290) at panic+0x177 sys/kern/subr_prf.c:198 tcp_output(ffff800000c2e308) at tcp_output+0x2cd2 sys/netinet/tcp_output.c:727 tcp_send(fffffd806f2b23d8,fffffd80693b1800,0,fffffd806a83a800) at tcp_send+0xc4 sys/netinet/tcp_usrreq.c:953 sosend(fffffd806f2b23d8,0,ffff80002921c160,0,fffffd806a83a800,0) at sosend+0x62a pru_send sys/sys/protosw.h:331 [inline] sosend(fffffd806f2b23d8,0,ffff80002921c160,0,fffffd806a83a800,0) at sosend+0x62a sys/kern/uipc_socket.c:646 sendit(ffff80002d83fa50,6,ffff80002921c2e0,0,ffff80002921c3d0) at sendit+0x65d sys/kern/uipc_syscalls.c:694 sys_sendmsg(ffff80002d83fa50,ffff80002921c388,ffff80002921c3d0) at sys_sendmsg+0x198 sys/kern/uipc_syscalls.c:601 syscall(ffff80002921c450) at syscall+0x4c3 mi_syscall sys/sys/syscall_mi.h:101 [inline] syscall(ffff80002921c450) at syscall+0x4c3 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xaa31d184260, count: -9 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff80002921bdc0 rbx 0xffff800020dd9b8f rdx 0xffff800000bf3640 rcx 0 rax 0xffff80002d83fa50 r8 0x101010101010101 r9 0x8080808080808080 r10 0xcb751690f8740131 r11 0x114ee97f85cebdd9 r12 0xffff800020dd9990 r13 0 r14 0 r15 0x1 rip 0xffffffff813a47e8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80002921bdb0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.2) pid=169149 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=81, nice=20 forw=0xffffffffffffffff, list=0xffff8000fffea2a0,0xffff80002d83fd00 process=0xffff8000ffff1d30 user=0xffff800029217000, vmspace=0xfffffd8066af1a30 estcpu=31, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 46539 499955 4546 0 2 0 syz-executor.3 57226 452446 51003 0 2 0 syz-executor.7 57226 78703 51003 0 2 0x4000000 syz-executor.7 20492 406091 89214 0 2 0 syz-executor.0 20492 295054 89214 0 3 0x4000080 fsleep syz-executor.0 11914 219111 89119 0 2 0 syz-executor.5 11914 427467 89119 0 3 0x4000080 fsleep syz-executor.5 13125 226456 38999 0 2 0 syz-executor.2 *13125 169149 38999 0 7 0x4000000 syz-executor.2 51003 231053 14827 0 3 0x82 nanoslp syz-executor.7 96909 104475 0 0 3 0x14280 nfsidl nfsio 52751 152621 0 0 3 0x14280 nfsidl nfsio 47117 250296 0 0 3 0x14280 nfsidl nfsio 3254 6889 0 0 3 0x14280 nfsidl nfsio 45402 459586 0 0 3 0x14280 nfsidl nfsio 14617 197378 0 0 3 0x14280 nfsidl nfsio 1933 35334 0 0 3 0x14280 nfsidl nfsio 14436 467512 0 0 3 0x14280 nfsidl nfsio 53933 175530 0 0 3 0x14280 nfsidl nfsio 88391 5286 0 0 3 0x14280 nfsidl nfsio 76495 289837 0 0 3 0x14280 nfsidl nfsio 68085 433575 0 0 3 0x14280 nfsidl nfsio 26994 347861 0 0 3 0x14280 nfsidl nfsio 20054 2539 0 0 3 0x14280 nfsidl nfsio 41160 110924 0 0 3 0x14280 nfsidl nfsio 65444 68347 0 0 3 0x14280 nfsidl nfsio 73543 452750 0 0 3 0x14280 nfsidl nfsio 74600 445892 0 0 3 0x14280 nfsidl nfsio 53288 306540 0 0 3 0x14280 nfsidl nfsio 79830 4156 0 0 3 0x14280 nfsidl nfsio 35044 437352 14827 0 3 0x82 nanoslp syz-executor.1 95321 171576 14827 0 3 0x82 nanoslp syz-executor.6 38999 129837 14827 0 3 0x82 nanoslp syz-executor.2 89119 94319 14827 0 3 0x82 nanoslp syz-executor.5 4546 217197 14827 0 3 0x82 nanoslp syz-executor.3 51088 473314 14827 0 3 0x82 nanoslp syz-executor.4 89214 195860 14827 0 3 0x82 nanoslp syz-executor.0 14827 475454 32496 0 3 0x82 wait syz-fuzzer 14827 520520 32496 0 3 0x4000082 thrsleep syz-fuzzer 14827 329217 32496 0 3 0x4000082 thrsleep syz-fuzzer 14827 414052 32496 0 3 0x4000082 wait syz-fuzzer 14827 159309 32496 0 3 0x4000082 thrsleep syz-fuzzer 14827 8685 32496 0 3 0x4000082 wait syz-fuzzer 14827 499113 32496 0 3 0x4000082 wait syz-fuzzer 14827 90548 32496 0 3 0x4000082 thrsleep syz-fuzzer 14827 62733 32496 0 3 0x4000082 thrsleep syz-fuzzer 14827 365447 32496 0 3 0x4000082 wait syz-fuzzer 14827 330078 32496 0 3 0x4000082 wait syz-fuzzer 14827 103575 32496 0 3 0x4000082 wait syz-fuzzer 14827 219779 32496 0 3 0x4000082 wait syz-fuzzer 14827 97942 32496 0 3 0x4000082 thrsleep syz-fuzzer 14827 441629 32496 0 3 0x4000082 thrsleep syz-fuzzer 14827 284283 32496 0 3 0x4000082 kqread syz-fuzzer 32496 391291 75015 0 3 0x10008a sigsusp ksh 75015 210188 81036 0 3 0x9a kqread sshd 36548 178546 1 0 3 0x100083 ttyin getty 81036 321924 1 0 3 0x88 kqread sshd 48019 157495 7682 74 3 0x1100092 bpf pflogd 7682 224189 1 0 3 0x80 netio pflogd 37584 99812 61429 73 3 0x1100090 kqread syslogd 61429 491550 1 0 3 0x100082 netio syslogd 12333 358506 1 0 3 0x100080 kqread resolvd 31556 158364 15520 77 3 0x100092 kqread dhcpleased 66065 74333 15520 77 3 0x100092 kqread dhcpleased 15520 389592 1 0 3 0x80 kqread dhcpleased 5870 376787 0 0 3 0x14200 bored smr 88094 233188 0 0 2 0x14200 zerothread 39648 435999 0 0 3 0x14200 aiodoned aiodoned 54863 479591 0 0 3 0x14200 syncer update 45959 416368 0 0 3 0x14200 cleaner cleaner 83548 306534 0 0 7 0x14200 reaper 36910 454683 0 0 3 0x14200 pgdaemon pagedaemon 9890 32972 0 0 3 0x14200 bored viomb 73325 46986 0 0 3 0x40014200 acpi0 acpi0 75403 357783 0 0 3 0x40014200 idle1 23892 234082 0 0 3 0x14200 bored softnet 90632 331403 0 0 3 0x14200 bored softnet 93798 40962 0 0 3 0x14200 bored softnet 92332 485898 0 0 3 0x14200 bored softnet 44473 521133 0 0 3 0x14200 bored systqmp 35805 309503 0 0 3 0x14200 bored systq 17135 438507 0 0 3 0x40014200 bored softclock 65699 73027 0 0 3 0x40014200 idle0 1 370590 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks CPU 0: exclusive mutex &uvm.fpageqlock r = 0 (0xffffffff82ae30b0) #0 witness_lock+0x44d #1 mtx_enter_try+0x100 #2 mtx_enter+0x4b sys/kern/kern_lock.c:266 #3 uvm_pmr_freepageq+0xcc sys/uvm/uvm_pmemrange.c:1333 #4 amap_wipeout+0x1ff sys/uvm/uvm_amap.c:523 #5 uvm_unmap_detach+0x7d sys/uvm/uvm_map.c:1351 #6 uvm_map_teardown+0x262 sys/uvm/uvm_map.c:2541 #7 uvmspace_free+0xa6 sys/uvm/uvm_map.c:3436 #8 reaper+0x19a sys/kern/kern_exit.c:448 #9 proc_trampoline+0x1c Process 13125 (syz-executor.2) thread 0xffff80002d83fa50 (169149) exclusive rwlock netlock r = 0 (0xffffffff8291b0b0) #0 witness_lock+0x44d #1 sosend+0x500 sys/kern/uipc_socket.c:632 #2 sendit+0x65d sys/kern/uipc_syscalls.c:694 #3 sys_sendmsg+0x198 sys/kern/uipc_syscalls.c:601 #4 syscall+0x4c3 mi_syscall sys/sys/syscall_mi.h:101 [inline] #4 syscall+0x4c3 sys/arch/amd64/amd64/trap.c:585 #5 Xsyscall+0x128 Process 83548 (reaper) thread 0xffff800021232fc8 (306534) exclusive kernel: protection fault trap, code=0 Faulted in DDB; continuing... ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10184 6474K 6732K 78643K 11767 0 pcb 13 11K 13K 78643K 49 0 rtable 188 6K 9K 78643K 444 0 ifaddr 83 16K 18K 78643K 232 0 sysctl 2 0K 0K 78643K 2 0 counters 56 35K 35K 78643K 82 0 ioctlops 0 0K 4K 78643K 1841 0 iov 0 0K 13K 78643K 27 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1339 84K 84K 78643K 1589 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 7 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 433 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 15 53K 89K 78643K 897 0 sigio 0 0K 0K 78643K 3 0 proc 70 91K 115K 78643K 571 0 subproc 104 6K 6K 78643K 117 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 656 0 in_multi 76 5K 6K 78643K 119 0 ether_multi 1 0K 0K 78643K 1 0 mrt 0 0K 0K 78643K 3 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 2K 78643K 809 0 tdb 3 0K 0K 78643K 3 0 pagedep 1 8K 8K 78643K 1 0 inodedep 1 32K 32K 78643K 1 0 newblk 1 0K 0K 78643K 1 0 VM swap 8 62K 62K 78643K 8 0 UVM amap 269 179K 180K 78643K 6532 0 UVM aobj 114 3K 3K 78643K 114 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 3 0 NDP 12 0K 2K 78643K 43 0 temp 97 4718K 4786K 78643K 7122 0 kqueue 12 18K 24K 78643K 64 0 SYN cache 2 16K 16K 78643K 2 0 ddb{1}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 22 0 0 1 0 1 1 0 8 0 rtpcb 120 80 0 77 2 0 2 2 0 8 1 rtentry 112 124 0 41 4 0 4 4 0 8 0 unpcb 144 216 0 193 2 1 1 2 0 8 0 syncache 296 4 0 4 1 1 0 1 0 8 0 tcpqe 32 146 0 146 1 1 0 1 0 8 0 tcpcb 768 534 0 497 19 11 8 18 0 8 4 arp 120 20 0 2 1 0 1 1 0 8 0 inpcb 368 761 0 745 17 10 7 13 0 8 5 nd6 48 28 0 10 1 0 1 1 0 8 0 pkpcb 40 5 0 5 2 1 1 1 0 8 1 kcovpl 48 9 0 1 1 0 1 1 0 8 0 ppxss 1256 10 0 10 1 1 0 1 0 8 0 pfstscr 40 10 0 8 2 1 1 1 0 8 0 pffrag 232 1 0 0 1 0 1 1 0 482 0 pffrnode 88 1 0 0 1 0 1 1 0 8 0 pffrent 40 4 0 3 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 pfrktable 1344 20 0 18 1 0 1 1 0 8 0 pfanchor 1280 10 0 2 1 0 1 1 0 8 0 pftag 88 1 0 1 1 1 0 1 0 8 0 pfstitem 24 39 0 20 1 0 1 1 0 8 0 pfstkey 120 49 0 30 2 1 1 2 0 8 0 pfstate 336 42 0 24 3 0 3 3 0 8 0 pfrule 1360 130 0 123 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 532 0 191 29 5 24 29 0 8 1 art_table 32 533 0 191 4 0 4 4 0 8 0 art_node 16 123 0 48 1 0 1 1 0 8 0 sysvmsgpl 40 1 0 0 1 0 1 1 0 8 0 semupl 112 4 0 4 1 1 0 1 0 8 0 semapl 112 431 0 421 1 0 1 1 0 8 0 shmpl 112 111 0 0 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 2446 0 1006 91 0 91 91 0 8 0 ffsino 272 2446 0 1006 97 0 97 97 0 8 0 nchpl 144 3628 0 1982 63 0 63 63 0 8 0 uvmvnodes 80 2739 0 0 56 0 56 56 0 8 0 vnodes 216 2739 0 0 153 0 153 153 0 8 0 namei 1024 11881 0 11881 3 2 1 2 0 8 1 percpumem 16 53 0 13 1 0 1 1 0 8 0 vcpupl 2048 6 0 0 1 0 1 1 0 8 0 vmpool 568 10 0 4 1 0 1 1 0 8 0 pfiaddrpl 120 7 0 5 1 0 1 1 0 8 0 kstatmem 264 50 0 26 2 0 2 2 0 8 0 scxspl 216 10980 0 10980 9 8 1 8 0 8 1 plimitpl 152 91 0 76 1 0 1 1 0 8 0 sigapl 424 1230 0 1162 10 2 8 8 0 8 0 futexpl 64 6604 0 6602 1 0 1 1 0 8 0 knotepl 120 245 0 0 8 0 8 8 0 8 0 kqueuepl 216 93 0 85 1 0 1 1 0 8 0 pipepl 320 194 0 166 7 1 6 6 0 8 3 fdescpl 496 1193 0 1165 5 1 4 5 0 8 0 filepl 152 5509 0 5252 21 5 16 20 0 8 6 lockfpl 104 70 0 68 1 0 1 1 0 8 0 lockfspl 48 35 0 33 1 0 1 1 0 8 0 sessionpl 144 25 0 8 1 0 1 1 0 8 0 pgrppl 48 25 0 8 1 0 1 1 0 8 0 ucredpl 104 649 0 637 1 0 1 1 0 8 0 zombiepl 144 1165 0 1162 1 0 1 1 0 8 0 processpl 1064 1230 0 1162 5 0 5 5 0 8 0 procpl 672 2438 0 2351 10 1 9 9 0 8 1 sockpl 488 1062 0 1020 26 16 10 21 0 8 4 mcl64k 65536 17 0 0 3 0 3 3 0 8 0 mcl16k 16384 7 0 0 1 0 1 1 0 8 0 mcl12k 12288 12 0 0 2 0 2 2 0 8 0 mcl9k 9216 8 0 0 1 0 1 1 0 8 0 mcl8k 8192 10 0 0 2 0 2 2 0 8 0 mcl4k 4096 17 0 0 3 0 3 3 0 8 0 mcl2k2 2112 3 0 0 1 0 1 1 0 8 0 mcl2k 2048 455 0 0 56 0 56 56 0 8 0 mtagpl 96 94 0 0 3 0 3 3 0 8 0 mbufpl 256 497 0 0 31 0 31 31 0 8 0 bufpl 288 4804 0 136 334 0 334 334 0 8 0 anonpl 24 208745 0 192936 120 14 106 116 0 186 1 amapchunkpl 152 16824 0 16098 35 3 32 32 0 158 2 amappl16 200 2995 0 2490 42 14 28 37 0 8 1 amappl15 192 296 0 283 1 0 1 1 0 8 0 amappl14 184 218 0 209 1 0 1 1 0 8 0 amappl13 176 312 0 307 1 0 1 1 0 8 0 amappl12 168 4 0 2 1 0 1 1 0 8 0 amappl11 160 93 0 74 1 0 1 1 0 8 0 amappl10 152 16 0 14 1 0 1 1 0 8 0 amappl9 144 693 0 687 1 0 1 1 0 8 0 amappl8 136 713 0 656 2 0 2 2 0 8 0 amappl7 128 227 0 207 1 0 1 1 0 8 0 amappl6 120 394 0 381 2 1 1 2 0 8 0 amappl5 112 669 0 654 1 0 1 1 0 8 0 amappl4 104 987 0 959 2 1 1 2 0 8 0 amappl3 96 2995 0 2943 2 0 2 2 0 8 0 amappl2 88 677 0 638 2 1 1 2 0 8 0 amappl1 80 30379 0 29737 21 5 16 20 0 8 1 amappl 88 6005 0 5834 5 0 5 5 0 92 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 72 113 0 0 3 0 3 3 0 8 0 uaddrrnd 24 1204 0 1170 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1204 0 1170 1 0 1 1 0 8 0 vmmpekpl 168 12257 0 12185 4 0 4 4 0 8 0 vmmpepl 168 116454 0 114025 135 7 128 128 0 357 14 vmsppl 368 1203 0 1170 5 1 4 4 0 8 0 rwobjpl 56 31903 0 27531 64 1 63 63 0 8 0 pdppl 4096 2415 0 2346 117 42 75 81 0 8 6 pvpl 32 510520 0 491393 259 27 232 258 0 265 63 pmappl 248 1203 0 1170 4 1 3 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 803 0 64 22 0 22 22 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp x86_ipi_db(ffffffff82977ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2f kd_curproc sys/dev/kcov.c:578 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2f sys/dev/kcov.c:148 mtx_leave(ffffffff82972000) at mtx_leave+0x24 sys/kern/kern_lock.c:357 msleep(ffffffff82b24830,ffffffff82972000,4,ffffffff82652e06,0) at msleep+0x142 sys/kern/kern_synch.c:234 reaper(ffff800021232fc8) at reaper+0xdb sys/kern/kern_exit.c:419 end trace frame: 0x0, count: 8 ddb{0}> trace x86_ipi_db(ffffffff82977ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2f kd_curproc sys/dev/kcov.c:578 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2f sys/dev/kcov.c:148 mtx_leave(ffffffff82972000) at mtx_leave+0x24 sys/kern/kern_lock.c:357 msleep(ffffffff82b24830,ffffffff82972000,4,ffffffff82652e06,0) at msleep+0x142 sys/kern/kern_synch.c:234 reaper(ffff800021232fc8) at reaper+0xdb sys/kern/kern_exit.c:419 end trace frame: 0x0, count: -7 ddb{0}> machine ddbcpu 1 Stopped at db_enter+0x18: addq $0x8,%rsp db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8257e290) at panic+0x177 sys/kern/subr_prf.c:198 tcp_output(ffff800000c2e308) at tcp_output+0x2cd2 sys/netinet/tcp_output.c:727 tcp_send(fffffd806f2b23d8,fffffd80693b1800,0,fffffd806a83a800) at tcp_send+0xc4 sys/netinet/tcp_usrreq.c:953 sosend(fffffd806f2b23d8,0,ffff80002921c160,0,fffffd806a83a800,0) at sosend+0x62a pru_send sys/sys/protosw.h:331 [inline] sosend(fffffd806f2b23d8,0,ffff80002921c160,0,fffffd806a83a800,0) at sosend+0x62a sys/kern/uipc_socket.c:646 sendit(ffff80002d83fa50,6,ffff80002921c2e0,0,ffff80002921c3d0) at sendit+0x65d sys/kern/uipc_syscalls.c:694 sys_sendmsg(ffff80002d83fa50,ffff80002921c388,ffff80002921c3d0) at sys_sendmsg+0x198 sys/kern/uipc_syscalls.c:601 syscall(ffff80002921c450) at syscall+0x4c3 mi_syscall sys/sys/syscall_mi.h:101 [inline] syscall(ffff80002921c450) at syscall+0x4c3 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xaa31d184260, count: 6 ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8257e290) at panic+0x177 sys/kern/subr_prf.c:198 tcp_output(ffff800000c2e308) at tcp_output+0x2cd2 sys/netinet/tcp_output.c:727 tcp_send(fffffd806f2b23d8,fffffd80693b1800,0,fffffd806a83a800) at tcp_send+0xc4 sys/netinet/tcp_usrreq.c:953 sosend(fffffd806f2b23d8,0,ffff80002921c160,0,fffffd806a83a800,0) at sosend+0x62a pru_send sys/sys/protosw.h:331 [inline] sosend(fffffd806f2b23d8,0,ffff80002921c160,0,fffffd806a83a800,0) at sosend+0x62a sys/kern/uipc_socket.c:646 sendit(ffff80002d83fa50,6,ffff80002921c2e0,0,ffff80002921c3d0) at sendit+0x65d sys/kern/uipc_syscalls.c:694 sys_sendmsg(ffff80002d83fa50,ffff80002921c388,ffff80002921c3d0) at sys_sendmsg+0x198 sys/kern/uipc_syscalls.c:601 syscall(ffff80002921c450) at syscall+0x4c3 mi_syscall sys/sys/syscall_mi.h:101 [inline] syscall(ffff80002921c450) at syscall+0x4c3 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xaa31d184260, count: -9