panic: tcp_output Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *285543 50172 32767 0x10 0x4000000 1 syz-executor.4 437281 51881 32767 0x10 0x4000000 0 syz-executor.5 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8257e05d) at panic+0x177 sys/kern/subr_prf.c:198 tcp_output(ffff800000d1d348) at tcp_output+0x2cd2 sys/netinet/tcp_output.c:727 tcp_send(fffffd8065f82020,fffffd8070664500,0,fffffd80660bd000) at tcp_send+0xc4 sys/netinet/tcp_usrreq.c:944 sosend(fffffd8065f82020,0,ffff80002e490750,0,fffffd80660bd000,0) at sosend+0x62a pru_send sys/sys/protosw.h:331 [inline] sosend(fffffd8065f82020,0,ffff80002e490750,0,fffffd80660bd000,0) at sosend+0x62a sys/kern/uipc_socket.c:646 sendit(ffff800026204548,3,ffff80002e4908d0,0,ffff80002e4909c0) at sendit+0x65d sys/kern/uipc_syscalls.c:694 sys_sendmsg(ffff800026204548,ffff80002e490978,ffff80002e4909c0) at sys_sendmsg+0x198 sys/kern/uipc_syscalls.c:601 syscall(ffff80002e490a40) at syscall+0x4c3 mi_syscall sys/sys/syscall_mi.h:101 [inline] syscall(ffff80002e490a40) at syscall+0x4c3 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xd0039ac2c60, 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(ffffffff8257e05d) at panic+0x177 sys/kern/subr_prf.c:198 tcp_output(ffff800000d1d348) at tcp_output+0x2cd2 sys/netinet/tcp_output.c:727 tcp_send(fffffd8065f82020,fffffd8070664500,0,fffffd80660bd000) at tcp_send+0xc4 sys/netinet/tcp_usrreq.c:944 sosend(fffffd8065f82020,0,ffff80002e490750,0,fffffd80660bd000,0) at sosend+0x62a pru_send sys/sys/protosw.h:331 [inline] sosend(fffffd8065f82020,0,ffff80002e490750,0,fffffd80660bd000,0) at sosend+0x62a sys/kern/uipc_socket.c:646 sendit(ffff800026204548,3,ffff80002e4908d0,0,ffff80002e4909c0) at sendit+0x65d sys/kern/uipc_syscalls.c:694 sys_sendmsg(ffff800026204548,ffff80002e490978,ffff80002e4909c0) at sys_sendmsg+0x198 sys/kern/uipc_syscalls.c:601 syscall(ffff80002e490a40) at syscall+0x4c3 mi_syscall sys/sys/syscall_mi.h:101 [inline] syscall(ffff80002e490a40) at syscall+0x4c3 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xd0039ac2c60, count: -9 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff80002e4903b0 rbx 0xffff800020dd9b8f rdx 0xffff800000bd9c40 rcx 0 rax 0xffff800026204548 r8 0x101010101010101 r9 0x8080808080808080 r10 0xe696846f70e453cb r11 0xe03a03313ce0d4c4 r12 0xffff800020dd9990 r13 0 r14 0 r15 0x1 rip 0xffffffff824835f8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80002e4903a0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.4) pid=285543 stat=onproc flags process=10 proc=4000000 pri=32, usrpri=81, nice=20 forw=0xffffffffffffffff, list=0xffff8000ffff5cf0,0xffff800026430550 process=0xffff80002642d0b8 user=0xffff80002e48b000, vmspace=0xfffffd8070d47180 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 78662 52853 88283 32767 3 0x90 nanoslp syz-executor.7 78662 411619 88283 32767 3 0x4000090 fsleep syz-executor.7 50172 360441 29756 32767 2 0x10 syz-executor.4 *50172 285543 29756 32767 7 0x4000010 syz-executor.4 32204 166501 92189 32767 2 0x10 syz-executor.0 32204 222882 92189 32767 3 0x4000090 fsleep syz-executor.0 32204 387233 92189 32767 3 0x4000090 fsleep syz-executor.0 95447 174059 58170 32767 2 0x10 syz-executor.6 51881 392536 9152 32767 2 0x10 syz-executor.5 51881 414034 9152 32767 2 0x4000010 syz-executor.5 51881 437281 9152 32767 7 0x4000010 syz-executor.5 77351 243107 62817 32767 2 0x10 syz-executor.2 80052 103621 53156 32767 3 0x90 nanoslp syz-executor.1 80052 491138 53156 32767 3 0x4000090 ttyout syz-executor.1 80052 442908 53156 32767 3 0x4000090 ttyout syz-executor.1 80052 400731 53156 32767 3 0x4000090 ttyin syz-executor.1 80052 228714 53156 32767 3 0x4000090 ttyout syz-executor.1 80052 173211 53156 32767 3 0x4000090 ttyout syz-executor.1 29756 128378 30966 32767 3 0x90 nanoslp syz-executor.4 30966 325999 15171 0 3 0x82 wait syz-executor.4 94672 156731 15649 32767 3 0x90 nanoslp syz-executor.3 15649 381174 15171 0 3 0x82 wait syz-executor.3 88283 235770 51636 32767 3 0x90 nanoslp syz-executor.7 51636 163948 15171 0 3 0x82 wait syz-executor.7 92189 461043 10413 32767 3 0x90 nanoslp syz-executor.0 10413 39390 15171 0 3 0x82 wait syz-executor.0 68842 350529 0 0 3 0x14200 bored sosplice 58170 245934 83120 32767 3 0x90 nanoslp syz-executor.6 9152 203924 70962 32767 2 0x490 syz-executor.5 70962 338262 15171 0 3 0x82 wait syz-executor.5 83120 386912 15171 0 3 0x82 wait syz-executor.6 62817 431879 69091 32767 2 0x490 syz-executor.2 69091 212170 15171 0 3 0x82 wait syz-executor.2 53156 484918 55273 32767 3 0x90 nanoslp syz-executor.1 55273 464411 15171 0 3 0x82 wait syz-executor.1 15171 20255 79233 0 3 0x82 wait syz-fuzzer 15171 143924 79233 0 3 0x4000082 thrsleep syz-fuzzer 15171 110680 79233 0 3 0x4000082 thrsleep syz-fuzzer 15171 473815 79233 0 3 0x4000082 kqread syz-fuzzer 15171 363829 79233 0 3 0x4000082 thrsleep syz-fuzzer 15171 357164 79233 0 3 0x4000082 wait syz-fuzzer 15171 394925 79233 0 3 0x4000082 thrsleep syz-fuzzer 15171 486481 79233 0 3 0x4000082 wait syz-fuzzer 15171 159880 79233 0 3 0x4000082 thrsleep syz-fuzzer 15171 152101 79233 0 3 0x4000082 wait syz-fuzzer 15171 171424 79233 0 3 0x4000082 wait syz-fuzzer 15171 364848 79233 0 3 0x4000082 wait syz-fuzzer 15171 84468 79233 0 3 0x4000082 wait syz-fuzzer 15171 523788 79233 0 3 0x4000082 thrsleep syz-fuzzer 15171 151248 79233 0 3 0x4000082 wait syz-fuzzer 15171 73264 79233 0 3 0x4000082 thrsleep syz-fuzzer 79233 173209 89269 0 3 0x10008a sigsusp ksh 89269 217519 74470 0 3 0x9a kqread sshd 12516 349423 1 0 3 0x100083 ttyin getty 74470 348454 1 0 3 0x88 kqread sshd 93831 523971 3018 73 3 0x1100090 kqread syslogd 3018 283683 1 0 3 0x100082 netio syslogd 6885 347735 1 0 3 0x100080 kqread resolvd 92488 312056 81947 77 3 0x100092 kqread dhcpleased 53832 2623 81947 77 3 0x100092 kqread dhcpleased 81947 484717 1 0 3 0x80 kqread dhcpleased 39009 145314 0 0 3 0x14200 bored smr 28396 220240 0 0 2 0x14200 zerothread 15038 128837 0 0 3 0x14200 aiodoned aiodoned 46235 476436 0 0 3 0x14200 syncer update 85467 35537 0 0 3 0x14200 cleaner cleaner 18588 32804 0 0 3 0x14200 reaper reaper 21456 32719 0 0 3 0x14200 pgdaemon pagedaemon 34516 228701 0 0 3 0x14200 bored viomb 86675 31272 0 0 3 0x40014200 acpi0 acpi0 95362 301210 0 0 3 0x40014200 idle1 28846 232300 0 0 3 0x14200 bored softnet 37314 158963 0 0 3 0x14200 bored softnet 29027 354792 0 0 3 0x14200 bored softnet 48906 324793 0 0 3 0x14200 bored softnet 37007 412742 0 0 3 0x14200 bored systqmp 2129 333406 0 0 3 0x14200 bored systq 77653 249533 0 0 2 0x40014200 softclock 15406 300132 0 0 3 0x40014200 idle0 1 424618 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 50172 (syz-executor.4) thread 0xffff800026204548 (285543) exclusive rwlock netlock r = 0 (0xffffffff829ae840) #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 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10211 6412K 6419K 78643K 11333 0 pcb 13 12K 14K 78643K 17 0 rtable 240 6K 7K 78643K 1423 0 ifaddr 82 17K 17K 78643K 156 0 sysctl 3 1K 3K 78643K 7 0 counters 56 35K 35K 78643K 76 0 ioctlops 0 0K 2K 78643K 165 0 iov 0 0K 28K 78643K 2831 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1271 79K 79K 78643K 4157 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 140 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 3584 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 25 93K 113K 78643K 12820 0 sigio 0 0K 0K 78643K 409 0 proc 56 78K 115K 78643K 1692 0 subproc 104 6K 6K 78643K 234 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 979 0 in_multi 99 6K 7K 78643K 410 0 ether_multi 1 0K 0K 78643K 77 0 mrt 1 0K 0K 78643K 1 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 247 1102K 1102K 78643K 247 0 exec 0 0K 2K 78643K 3137 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 392 94K 117K 78643K 80762 0 UVM aobj 131 5K 5K 78643K 131 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 1 0K 0K 78643K 493 0 NDP 11 0K 2K 78643K 57 0 temp 126 4726K 4791K 78643K 44742 0 kqueue 19 28K 32K 78643K 4467 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 11130 0 11120 74 71 3 6 0 8 2 rtentry 112 238 0 125 4 0 4 4 0 8 0 unpcb 144 34779 0 34752 154 148 6 13 0 8 5 syncache 296 192 0 192 29 28 1 1 0 8 1 tcpqe 32 177 0 177 22 21 1 1 0 8 1 tcpcb 768 5348 0 5339 155 144 11 18 0 8 8 arp 120 42 0 24 1 0 1 1 0 8 0 ipq 40 9 0 8 5 4 1 1 0 8 0 ipqe 40 33 0 32 5 4 1 1 0 8 0 inpcb 368 11812 0 11799 169 159 10 14 0 8 7 ip6q 72 2 0 2 1 1 0 1 0 8 0 ip6af 40 6 0 6 1 1 0 1 0 8 0 nd6 48 67 0 40 1 0 1 1 0 8 0 kcovpl 48 18 0 10 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 941 0 477 30 1 29 30 0 8 0 art_table 32 942 0 477 4 0 4 4 0 8 0 art_node 16 237 0 134 1 0 1 1 0 8 0 sysvmsgpl 40 2 0 2 1 1 0 1 0 8 0 semapl 112 3582 0 3572 1 0 1 1 0 8 0 shmpl 112 128 0 0 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 19074 0 17615 92 0 92 92 0 8 0 ffsino 272 19074 0 17615 98 0 98 98 0 8 0 nchpl 144 36096 0 34456 63 0 63 63 0 8 0 uvmvnodes 80 5926 0 0 121 0 121 121 0 8 0 vnodes 216 5926 0 0 330 0 330 330 0 8 0 namei 1024 124259 0 124259 3 2 1 2 0 8 1 percpumem 16 50 0 10 1 0 1 1 0 8 0 kstatmem 264 42 0 20 2 0 2 2 0 8 0 scxspl 216 99855 0 99855 42 39 3 8 0 8 3 plimitpl 152 3360 0 3338 14 13 1 2 0 8 0 sigapl 424 13080 0 13025 8 1 7 7 0 8 0 futexpl 64 132707 0 132704 1 0 1 1 0 8 0 knotepl 120 1224 0 0 19 1 18 18 0 8 0 kqueuepl 216 7397 0 7383 76 75 1 14 0 8 0 pipepl 320 3401 0 3371 102 94 8 13 0 8 5 fdescpl 496 13062 0 13026 6 1 5 6 0 8 0 filepl 152 121443 0 121177 205 187 18 25 0 8 7 lockfpl 104 1394 0 1392 1 0 1 1 0 8 0 lockfspl 48 447 0 445 1 0 1 1 0 8 0 sessionpl 144 33 0 17 1 0 1 1 0 8 0 pgrppl 48 67 0 51 1 0 1 1 0 8 0 ucredpl 104 17818 0 17800 1 0 1 1 0 8 0 zombiepl 144 13026 0 13025 1 0 1 1 0 8 0 processpl 1064 13080 0 13025 4 0 4 4 0 8 0 procpl 672 40125 0 40044 34 26 8 9 0 8 1 sosppl 168 263 0 262 15 14 1 1 0 8 0 sockpl 488 58189 0 58138 1044 1030 14 46 0 8 7 mcl64k 65536 41 0 0 5 2 3 3 0 8 0 mcl16k 16384 33 0 0 4 1 3 3 0 8 0 mcl12k 12288 25 0 0 2 0 2 2 0 8 0 mcl9k 9216 17 0 0 2 0 2 2 0 8 0 mcl8k 8192 47 0 0 4 1 3 3 0 8 0 mcl4k 4096 65 0 0 5 0 5 5 0 8 0 mcl2k2 2112 7 0 0 1 0 1 1 0 8 0 mcl2k 2048 618 0 0 45 20 25 45 0 8 0 mtagpl 96 4 0 0 1 0 1 1 0 8 0 mbufpl 256 1881 0 0 105 0 105 105 0 8 0 bufpl 288 23416 0 17086 453 0 453 453 0 8 0 anonpl 24 2669106 0 2655795 224 126 98 107 0 186 0 amapchunkpl 152 241496 0 240807 117 86 31 42 0 158 0 amappl16 200 40993 0 40614 228 207 21 34 0 8 0 amappl15 192 3467 0 3459 1 0 1 1 0 8 0 amappl14 184 816 0 809 1 0 1 1 0 8 0 amappl13 176 156 0 153 1 0 1 1 0 8 0 amappl12 168 4185 0 4174 2 1 1 1 0 8 0 amappl11 160 1579 0 1562 1 0 1 1 0 8 0 amappl10 152 367 0 361 1 0 1 1 0 8 0 amappl9 144 2216 0 2207 1 0 1 1 0 8 0 amappl8 136 2131 0 1943 7 0 7 7 0 8 0 amappl7 128 1070 0 1047 1 0 1 1 0 8 0 amappl6 120 2018 0 1998 2 1 1 2 0 8 0 amappl5 112 13034 0 13011 1 0 1 1 0 8 0 amappl4 104 2791 0 2757 2 1 1 2 0 8 0 amappl3 96 44978 0 44910 2 0 2 2 0 8 0 amappl2 88 1422 0 1385 2 1 1 2 0 8 0 amappl1 80 327684 0 326942 33 16 17 19 0 8 0 amappl 88 79447 0 79247 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 72 130 0 0 3 0 3 3 0 8 0 uaddrrnd 24 13063 0 13027 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 13063 0 13027 1 0 1 1 0 8 0 vmmpekpl 168 111544 0 111474 4 0 4 4 0 8 0 vmmpepl 168 1294161 0 1291209 279 144 135 143 0 357 2 vmsppl 368 13062 0 13027 4 0 4 4 0 8 0 rwobjpl 56 331378 0 323804 134 24 110 111 0 8 0 pdppl 4096 26133 0 26054 369 288 81 89 0 8 2 pvpl 32 4941858 0 4923186 485 315 170 255 0 265 0 pmappl 248 13062 0 13027 3 0 3 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 1393 0 476 27 0 27 27 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp x86_ipi_db(ffffffff829b8ff0) 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_cmp8(1000,3c000) at __sanitizer_cov_trace_cmp8+0x11 kd_curproc sys/dev/kcov.c:574 [inline] __sanitizer_cov_trace_cmp8(1000,3c000) at __sanitizer_cov_trace_cmp8+0x11 sys/dev/kcov.c:207 uvm_map_lookup_entry(fffffd8070d47a20,3c000,ffff80002e529be8) at uvm_map_lookup_entry+0x159 sys/uvm/uvm_map.c:1578 uvmfault_lookup(ffff80002e529bc0,0) at uvmfault_lookup+0xea sys/uvm/uvm_fault.c:1771 uvm_fault_check(ffff80002e529bc0,ffff80002e529bf8,ffff80002e529c20) at uvm_fault_check+0x3a sys/uvm/uvm_fault.c:673 uvm_fault(fffffd8070d47a20,3c000,0,2) at uvm_fault+0xf2 sys/uvm/uvm_fault.c:601 kpageflttrap(ffff80002e529d50,3c0e0) at kpageflttrap+0x209 kerntrap(ffff80002e529d50) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyout() at copyout+0x53 syscall(ffff80002e52a1a0) at syscall+0x4c3 mi_syscall sys/sys/syscall_mi.h:101 [inline] syscall(ffff80002e52a1a0) at syscall+0x4c3 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xc34646daf50, count: 1 ddb{0}> trace x86_ipi_db(ffffffff829b8ff0) 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_cmp8(1000,3c000) at __sanitizer_cov_trace_cmp8+0x11 kd_curproc sys/dev/kcov.c:574 [inline] __sanitizer_cov_trace_cmp8(1000,3c000) at __sanitizer_cov_trace_cmp8+0x11 sys/dev/kcov.c:207 uvm_map_lookup_entry(fffffd8070d47a20,3c000,ffff80002e529be8) at uvm_map_lookup_entry+0x159 sys/uvm/uvm_map.c:1578 uvmfault_lookup(ffff80002e529bc0,0) at uvmfault_lookup+0xea sys/uvm/uvm_fault.c:1771 uvm_fault_check(ffff80002e529bc0,ffff80002e529bf8,ffff80002e529c20) at uvm_fault_check+0x3a sys/uvm/uvm_fault.c:673 uvm_fault(fffffd8070d47a20,3c000,0,2) at uvm_fault+0xf2 sys/uvm/uvm_fault.c:601 kpageflttrap(ffff80002e529d50,3c0e0) at kpageflttrap+0x209 kerntrap(ffff80002e529d50) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyout() at copyout+0x53 syscall(ffff80002e52a1a0) at syscall+0x4c3 mi_syscall sys/sys/syscall_mi.h:101 [inline] syscall(ffff80002e52a1a0) at syscall+0x4c3 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xc34646daf50, count: -14 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(ffffffff8257e05d) at panic+0x177 sys/kern/subr_prf.c:198 tcp_output(ffff800000d1d348) at tcp_output+0x2cd2 sys/netinet/tcp_output.c:727 tcp_send(fffffd8065f82020,fffffd8070664500,0,fffffd80660bd000) at tcp_send+0xc4 sys/netinet/tcp_usrreq.c:944 sosend(fffffd8065f82020,0,ffff80002e490750,0,fffffd80660bd000,0) at sosend+0x62a pru_send sys/sys/protosw.h:331 [inline] sosend(fffffd8065f82020,0,ffff80002e490750,0,fffffd80660bd000,0) at sosend+0x62a sys/kern/uipc_socket.c:646 sendit(ffff800026204548,3,ffff80002e4908d0,0,ffff80002e4909c0) at sendit+0x65d sys/kern/uipc_syscalls.c:694 sys_sendmsg(ffff800026204548,ffff80002e490978,ffff80002e4909c0) at sys_sendmsg+0x198 sys/kern/uipc_syscalls.c:601 syscall(ffff80002e490a40) at syscall+0x4c3 mi_syscall sys/sys/syscall_mi.h:101 [inline] syscall(ffff80002e490a40) at syscall+0x4c3 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xd0039ac2c60, count: 6 ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8257e05d) at panic+0x177 sys/kern/subr_prf.c:198 tcp_output(ffff800000d1d348) at tcp_output+0x2cd2 sys/netinet/tcp_output.c:727 tcp_send(fffffd8065f82020,fffffd8070664500,0,fffffd80660bd000) at tcp_send+0xc4 sys/netinet/tcp_usrreq.c:944 sosend(fffffd8065f82020,0,ffff80002e490750,0,fffffd80660bd000,0) at sosend+0x62a pru_send sys/sys/protosw.h:331 [inline] sosend(fffffd8065f82020,0,ffff80002e490750,0,fffffd80660bd000,0) at sosend+0x62a sys/kern/uipc_socket.c:646 sendit(ffff800026204548,3,ffff80002e4908d0,0,ffff80002e4909c0) at sendit+0x65d sys/kern/uipc_syscalls.c:694 sys_sendmsg(ffff800026204548,ffff80002e490978,ffff80002e4909c0) at sys_sendmsg+0x198 sys/kern/uipc_syscalls.c:601 syscall(ffff80002e490a40) at syscall+0x4c3 mi_syscall sys/sys/syscall_mi.h:101 [inline] syscall(ffff80002e490a40) at syscall+0x4c3 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xd0039ac2c60, count: -9