panic: tcp_output Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *223149 47785 0 0 0x4000000 0 syz-executor.5 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff82550c9e) at panic+0x161 sys/kern/subr_prf.c:198 tcp_output(ffff800000f15968) at tcp_output+0x2a72 sys/netinet/tcp_output.c:727 tcp_send(fffffd8065846750,fffffd807ad98b00,fffffd807ad98100,fffffd807ad98300) at tcp_send+0xc4 sys/netinet/tcp_usrreq.c:944 sosend(fffffd8065846750,fffffd807ad98100,ffff8000264f1b40,0,fffffd807ad98300,0) at sosend+0x62a pru_send sys/sys/protosw.h:331 [inline] sosend(fffffd8065846750,fffffd807ad98100,ffff8000264f1b40,0,fffffd807ad98300,0) at sosend+0x62a sys/kern/uipc_socket.c:646 sendit(ffff8000217b5a48,3,ffff8000264f1cc0,0,ffff8000264f1dc0) at sendit+0x64d sys/kern/uipc_syscalls.c:694 sys_sendmsg(ffff8000217b5a48,ffff8000264f1d68,ffff8000264f1dc0) at sys_sendmsg+0x198 sys/kern/uipc_syscalls.c:601 syscall(ffff8000264f1e30) at syscall+0x447 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xb9f23a0b720, 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> ddb> set $lines = 0 ddb> set $maxwidth = 0 ddb> show panic *cpu0: tcp_output ddb> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff82550c9e) at panic+0x161 sys/kern/subr_prf.c:198 tcp_output(ffff800000f15968) at tcp_output+0x2a72 sys/netinet/tcp_output.c:727 tcp_send(fffffd8065846750,fffffd807ad98b00,fffffd807ad98100,fffffd807ad98300) at tcp_send+0xc4 sys/netinet/tcp_usrreq.c:944 sosend(fffffd8065846750,fffffd807ad98100,ffff8000264f1b40,0,fffffd807ad98300,0) at sosend+0x62a pru_send sys/sys/protosw.h:331 [inline] sosend(fffffd8065846750,fffffd807ad98100,ffff8000264f1b40,0,fffffd807ad98300,0) at sosend+0x62a sys/kern/uipc_socket.c:646 sendit(ffff8000217b5a48,3,ffff8000264f1cc0,0,ffff8000264f1dc0) at sendit+0x64d sys/kern/uipc_syscalls.c:694 sys_sendmsg(ffff8000217b5a48,ffff8000264f1d68,ffff8000264f1dc0) at sys_sendmsg+0x198 sys/kern/uipc_syscalls.c:601 syscall(ffff8000264f1e30) at syscall+0x447 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xb9f23a0b720, count: -9 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff8000264f17b0 rbx 0x7c rdx 0xffff800000bc34c0 rcx 0 rax 0xffff8000217b5a48 r8 0x101010101010101 r9 0x8080808080808080 r10 0xae7ed7f01a7d5ed2 r11 0x32d0c204e1208fe r12 0 r13 0 r14 0 r15 0x1 rip 0xffffffff81685218 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff8000264f17a0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (syz-executor.5) pid=223149 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=83, nice=20 forw=0xffffffffffffffff, list=0xffff8000217b4d28,0xffffffff82a18910 process=0xffff80002660c030 user=0xffff8000264ec000, vmspace=0xfffffd807db7cee0 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 47785 278471 6826 0 2 0 syz-executor.5 *47785 223149 6826 0 7 0x4000000 syz-executor.5 27635 462833 85990 0 2 0 syz-executor.3 27635 496835 85990 0 3 0x4000080 fsleep syz-executor.3 41157 342940 89447 0 3 0x80 nanoslp syz-executor.6 41157 210449 89447 0 3 0x4000080 netcon syz-executor.6 41157 135195 89447 0 3 0x4000080 fsleep syz-executor.6 41157 454749 89447 0 3 0x4000080 fsleep syz-executor.6 88998 29199 40707 0 2 0 syz-executor.2 88998 140120 40707 0 3 0x4000080 netcon syz-executor.2 67322 54645 66563 0 3 0x80 nanoslp syz-executor.7 67322 73381 66563 0 3 0x4000080 netcon syz-executor.7 67322 255087 66563 0 3 0x4000080 fsleep syz-executor.7 67322 109335 66563 0 3 0x4000080 fsleep syz-executor.7 68360 315515 49892 0 3 0x82 nanoslp syz-executor.1 85579 285386 49892 0 3 0x82 nanoslp syz-executor.0 28931 45288 49892 0 2 0x2 syz-executor.4 89447 344316 49892 0 3 0x82 nanoslp syz-executor.6 6826 173019 49892 0 3 0x82 nanoslp syz-executor.5 85990 430193 49892 0 3 0x82 nanoslp syz-executor.3 40707 8512 49892 0 3 0x82 nanoslp syz-executor.2 66563 281823 49892 0 3 0x82 nanoslp syz-executor.7 26250 495618 1 0 3 0x100083 ttyin getty 87333 257911 0 0 3 0x14200 acct acct 75099 34824 0 0 3 0x14280 nfsidl nfsio 2736 62442 0 0 3 0x14280 nfsidl nfsio 36115 37318 0 0 3 0x14280 nfsidl nfsio 57305 166293 0 0 3 0x14280 nfsidl nfsio 41834 87260 0 0 3 0x14280 nfsidl nfsio 95544 243945 0 0 3 0x14280 nfsidl nfsio 284 312544 0 0 3 0x14280 nfsidl nfsio 1985 169491 0 0 3 0x14280 nfsidl nfsio 73649 374192 0 0 3 0x14280 nfsidl nfsio 53568 59923 0 0 3 0x14280 nfsidl nfsio 1582 69485 0 0 3 0x14280 nfsidl nfsio 95744 256805 0 0 3 0x14280 nfsidl nfsio 69799 383966 0 0 3 0x14280 nfsidl nfsio 17288 72256 0 0 3 0x14280 nfsidl nfsio 75973 340162 0 0 3 0x14280 nfsidl nfsio 52022 346160 0 0 3 0x14280 nfsidl nfsio 41344 231015 0 0 3 0x14280 nfsidl nfsio 18303 518786 0 0 3 0x14280 nfsidl nfsio 16182 240264 0 0 3 0x14280 nfsidl nfsio 15623 205448 0 0 3 0x14280 nfsidl nfsio 56613 469496 0 0 3 0x14200 bored sosplice 49892 113926 52669 0 3 0x82 wait syz-fuzzer 49892 493602 52669 0 3 0x4000082 nanoslp syz-fuzzer 49892 315133 52669 0 3 0x4000082 wait syz-fuzzer 49892 320101 52669 0 3 0x4000082 thrsleep syz-fuzzer 49892 165485 52669 0 3 0x4000082 thrsleep syz-fuzzer 49892 50199 52669 0 3 0x4000082 kqread syz-fuzzer 49892 244776 52669 0 3 0x4000082 wait syz-fuzzer 49892 283984 52669 0 3 0x4000082 wait syz-fuzzer 49892 172788 52669 0 3 0x4000082 thrsleep syz-fuzzer 49892 435265 52669 0 3 0x4000082 wait syz-fuzzer 49892 39849 52669 0 3 0x4000082 wait syz-fuzzer 49892 421735 52669 0 3 0x4000082 wait syz-fuzzer 49892 364063 52669 0 3 0x4000082 wait syz-fuzzer 49892 101687 52669 0 3 0x4000082 thrsleep syz-fuzzer 49892 306512 52669 0 3 0x4000082 thrsleep syz-fuzzer 52669 475318 77294 0 3 0x10008a sigsusp ksh 77294 347031 61676 0 3 0x9a kqread sshd 61676 496040 1 0 3 0x88 kqread sshd 52280 352130 47153 73 3 0x1100090 kqread syslogd 47153 216443 1 0 3 0x100082 netio syslogd 35336 393457 1 0 3 0x100080 kqread resolvd 89725 4396 65966 77 3 0x100092 kqread dhcpleased 97781 218917 65966 77 3 0x100092 kqread dhcpleased 65966 269407 1 0 3 0x80 kqread dhcpleased 59570 268985 0 0 3 0x14200 bored smr 7639 108528 0 0 2 0x14200 zerothread 48547 285792 0 0 3 0x14200 aiodoned aiodoned 70676 246734 0 0 3 0x14200 syncer update 42990 306683 0 0 3 0x14200 cleaner cleaner 26870 136738 0 0 3 0x14200 reaper reaper 53067 303944 0 0 3 0x14200 pgdaemon pagedaemon 30161 489543 0 0 3 0x14200 bored viomb 57347 491847 0 0 3 0x40014200 acpi0 acpi0 99523 331484 0 0 3 0x14200 bored softnet 24811 493051 0 0 3 0x14200 bored softnet 8061 163670 0 0 3 0x14200 bored softnet 15555 404495 0 0 3 0x14200 bored softnet 92720 440510 0 0 3 0x14200 bored systqmp 37046 315267 0 0 3 0x14200 bored systq 53185 338038 0 0 3 0x40014200 bored softclock 91020 223204 0 0 3 0x40014200 idle0 1 389967 0 0 3 0x80082 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb> show all locks No such command ddb> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10214 6440K 8004K 78643K 69362 0 pcb 13 18K 22K 78643K 5230 0 rtable 220 12K 13K 78643K 6297 0 ifaddr 99 27K 30K 78643K 1800 0 sysctl 2 0K 2K 78643K 42 0 counters 27 17K 17K 78643K 370 0 ioctlops 0 0K 4K 78643K 6509 0 iov 0 0K 32K 78643K 3958 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1430 89K 90K 78643K 19174 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 305 0 VM map 2 0K 0K 78643K 2 0 sem 20 21K 41K 78643K 50 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 15 53K 73K 78643K 27577 0 sigio 0 0K 0K 78643K 599 0 proc 61 59K 75K 78643K 4049 0 subproc 104 6K 6K 78643K 1346 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 994 0 in_multi 81 5K 6K 78643K 1905 0 ether_multi 2 0K 0K 78643K 75 0 mrt 4 0K 0K 78643K 118 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 259 1155K 1155K 78643K 259 0 exec 0 0K 2K 78643K 7273 0 pfkey data 0 0K 0K 78643K 51 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 696 1942K 1947K 78643K 148745 0 UVM aobj 96 3K 4K 78643K 110 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 1076 0 NDP 14 0K 2K 78643K 541 0 temp 140 4718K 66415K 78643K 228756 0 kqueue 12 18K 26K 78643K 2031 0 SYN cache 2 20K 28K 78643K 3 0 ddb> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle rtpcb 120 2370 0 2367 37 36 1 5 0 8 0 rtentry 112 1659 0 1565 5 1 4 4 0 8 0 unpcb 144 19228 0 19208 210 209 1 10 0 8 0 syncache 296 141 0 141 32 31 1 1 0 8 1 tcpqe 32 444 0 444 15 14 1 1 0 8 1 tcpcb 768 8457 0 8445 308 303 5 18 0 8 3 arp 88 243 0 227 1 0 1 1 0 8 0 ipq 40 23 0 23 11 11 0 1 0 8 0 ipqe 40 142 0 142 11 11 0 1 0 8 0 inpcb 336 24412 0 24396 365 360 5 16 0 8 3 ip6q 72 14 0 14 6 6 0 1 0 8 0 ip6af 40 22 0 22 6 6 0 1 0 8 0 nd6 48 388 0 364 1 0 1 1 0 8 0 pkpcb 40 144 0 144 19 19 0 1 0 8 0 kcovpl 48 103 0 95 1 0 1 1 0 8 0 ppxss 1160 228 0 228 33 33 0 1 0 8 0 pfstscr 40 9 0 4 1 0 1 1 0 8 0 pfrktable 1344 353 0 353 2 2 0 1 0 8 0 pfanchor 1280 639 143 127 43 0 43 43 0 8 0 pftag 88 36 0 35 1 0 1 1 0 8 0 pfqueue 264 3 0 3 1 1 0 1 0 8 0 pfstitem 24 3 0 0 1 0 1 1 0 8 0 pfstkey 120 6 0 5 1 0 1 1 0 8 0 pfstate 336 6 0 3 1 0 1 1 0 8 0 pfrule 1360 110 0 110 3 3 0 1 0 8 0 rttmr 136 24 0 24 8 8 0 1 0 8 0 art_heap8 4096 14 0 12 12 10 2 3 0 8 0 art_heap4 256 7919 0 7480 82 50 32 34 0 8 0 art_table 32 7933 0 7492 7 2 5 5 0 8 0 art_node 16 1645 0 1563 1 0 1 1 0 8 0 sysvmsgpl 40 147 0 147 3 3 0 1 0 8 0 semapl 112 19 0 1 1 0 1 1 0 8 0 shmpl 112 107 0 17 3 0 3 3 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 37934 0 36408 96 0 96 96 0 8 0 ffsino 240 37934 0 36408 90 0 90 90 0 8 0 nchpl 144 73528 0 71870 64 1 63 64 0 8 0 rtmask 32 9 0 9 4 4 0 1 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 316052 0 316052 13 12 1 2 0 8 1 vcpupl 2048 281 0 0 36 0 36 36 0 8 0 vmpool 536 371 0 90 21 2 19 19 0 8 0 pfiaddrpl 120 111 0 111 2 2 0 1 0 8 0 kstatmem 264 544 0 516 4 1 3 3 0 8 0 scsiplug 72 19 0 19 7 7 0 1 0 8 0 scxspl 216 202659 0 202659 53 51 2 8 0 8 2 plimitpl 152 3445 0 3431 1 0 1 1 0 8 0 sigapl 424 27700 0 27634 8 0 8 8 0 8 0 futexpl 64 284017 0 284012 7 6 1 1 0 8 0 knotepl 120 351439 0 351359 135 130 5 15 0 8 2 kqueuepl 184 5485 0 5412 75 71 4 7 0 8 0 pipepl 288 5314 0 5285 122 118 4 11 0 8 1 fdescpl 432 27660 0 27634 4 0 4 4 0 8 0 filepl 120 214634 0 214312 273 261 12 17 0 8 1 lockfpl 104 7056 0 7053 15 14 1 2 0 8 0 lockfspl 48 1991 0 1988 1 0 1 1 0 8 0 sessionpl 144 124 0 108 1 0 1 1 0 8 0 pgrppl 48 338 0 322 1 0 1 1 0 8 0 ucredpl 104 26066 0 26056 1 0 1 1 0 8 0 zombiepl 144 27636 0 27634 2 1 1 1 0 8 0 processpl 1000 27700 0 27634 10 1 9 9 0 8 0 procpl 672 68693 0 68604 76 68 8 10 0 8 0 sosppl 168 291 0 290 44 43 1 1 0 8 0 sockpl 456 46169 0 46133 1127 1118 9 34 0 8 4 mcl64k 65536 1042 0 1042 63 62 1 1 0 8 1 mcl16k 16384 277 0 277 68 68 0 1 0 8 0 mcl12k 12288 929 0 929 67 66 1 1 0 8 1 mcl9k 9216 357 0 357 78 77 1 1 0 8 1 mcl8k 8192 1315 0 1315 66 65 1 1 0 8 1 mcl4k 4096 2706 0 2706 40 39 1 1 0 8 1 mcl2k2 2112 211 0 211 72 72 0 1 0 8 0 mcl2k 2048 125528 0 125465 67 56 11 24 0 8 0 mtagpl 96 6860 0 6269 56 40 16 19 0 8 0 mbufpl 256 375662 0 374872 875 821 54 417 0 8 0 bufpl 288 46440 0 40033 458 0 458 458 0 8 0 anonpl 24 5165382 0 5144601 450 307 143 164 0 188 0 amapchunkpl 152 432822 0 432036 174 141 33 46 0 158 1 amappl16 200 76347 0 75440 272 220 52 62 0 8 0 amappl15 192 3546 0 3537 1 0 1 1 0 8 0 amappl14 184 4132 0 4130 1 0 1 1 0 8 0 amappl13 176 4720 0 4718 1 0 1 1 0 8 0 amappl12 168 3482 0 3478 1 0 1 1 0 8 0 amappl11 160 3280 0 3264 1 0 1 1 0 8 0 amappl10 152 3598 0 3591 1 0 1 1 0 8 0 amappl9 144 5136 0 5131 1 0 1 1 0 8 0 amappl8 136 4543 0 4423 5 0 5 5 0 8 0 amappl7 128 2382 0 2361 1 0 1 1 0 8 0 amappl6 120 5464 0 5430 3 1 2 2 0 8 0 amappl5 112 21024 0 21005 1 0 1 1 0 8 0 amappl4 104 9579 0 9548 7 5 2 2 0 8 0 amappl3 96 85457 0 85393 2 0 2 2 0 8 0 amappl2 88 8243 0 8202 2 0 2 2 0 8 0 amappl1 80 673385 0 672746 26 11 15 19 0 8 0 amappl 88 145907 0 145608 11 3 8 8 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 72 109 0 14 2 0 2 2 0 8 0 uaddrrnd 24 28031 0 27724 2 0 2 2 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 28031 0 27724 2 0 2 2 0 8 0 vmmpekpl 168 178299 0 178206 5 0 5 5 0 8 0 vmmpepl 168 2689706 0 2686333 503 337 166 175 0 357 5 vmsppl 272 28030 0 27724 23 2 21 21 0 8 0 rwobjpl 24 633890 0 625769 57 6 51 51 0 8 0 pdppl 4096 56068 0 55729 1824 1479 345 345 0 8 6 pvpl 32 9789180 0 9769078 717 532 185 255 0 265 0 pmappl 216 28030 0 27724 18 0 18 18 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 4310 0 3147 51 17 34 37 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff82550c9e) at panic+0x161 sys/kern/subr_prf.c:198 tcp_output(ffff800000f15968) at tcp_output+0x2a72 sys/netinet/tcp_output.c:727 tcp_send(fffffd8065846750,fffffd807ad98b00,fffffd807ad98100,fffffd807ad98300) at tcp_send+0xc4 sys/netinet/tcp_usrreq.c:944 sosend(fffffd8065846750,fffffd807ad98100,ffff8000264f1b40,0,fffffd807ad98300,0) at sosend+0x62a pru_send sys/sys/protosw.h:331 [inline] sosend(fffffd8065846750,fffffd807ad98100,ffff8000264f1b40,0,fffffd807ad98300,0) at sosend+0x62a sys/kern/uipc_socket.c:646 sendit(ffff8000217b5a48,3,ffff8000264f1cc0,0,ffff8000264f1dc0) at sendit+0x64d sys/kern/uipc_syscalls.c:694 sys_sendmsg(ffff8000217b5a48,ffff8000264f1d68,ffff8000264f1dc0) at sys_sendmsg+0x198 sys/kern/uipc_syscalls.c:601 syscall(ffff8000264f1e30) at syscall+0x447 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xb9f23a0b720, count: -9 ddb> machine ddbcpu 1 No such command ddb> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff82550c9e) at panic+0x161 sys/kern/subr_prf.c:198 tcp_output(ffff800000f15968) at tcp_output+0x2a72 sys/netinet/tcp_output.c:727 tcp_send(fffffd8065846750,fffffd807ad98b00,fffffd807ad98100,fffffd807ad98300) at tcp_send+0xc4 sys/netinet/tcp_usrreq.c:944 sosend(fffffd8065846750,fffffd807ad98100,ffff8000264f1b40,0,fffffd807ad98300,0) at sosend+0x62a pru_send sys/sys/protosw.h:331 [inline] sosend(fffffd8065846750,fffffd807ad98100,ffff8000264f1b40,0,fffffd807ad98300,0) at sosend+0x62a sys/kern/uipc_socket.c:646 sendit(ffff8000217b5a48,3,ffff8000264f1cc0,0,ffff8000264f1dc0) at sendit+0x64d sys/kern/uipc_syscalls.c:694 sys_sendmsg(ffff8000217b5a48,ffff8000264f1d68,ffff8000264f1dc0) at sys_sendmsg+0x198 sys/kern/uipc_syscalls.c:601 syscall(ffff8000264f1e30) at syscall+0x447 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xb9f23a0b720, count: -9