panic: tcp_output Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND * 9905 72710 0 0 0x4000000 0 syz-executor.0 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8254ebcf) at panic+0x161 sys/kern/subr_prf.c:198 tcp_output(ffff800000cdf018) at tcp_output+0x2a72 sys/netinet/tcp_output.c:727 tcp_send(fffffd806a612278,fffffd806655e000,fffffd806655eb00,fffffd806655e200) at tcp_send+0xc4 sys/netinet/tcp_usrreq.c:953 sosend(fffffd806a612278,fffffd806655eb00,ffff80002e901b80,0,fffffd806655e200,0) at sosend+0x62a pru_send sys/sys/protosw.h:331 [inline] sosend(fffffd806a612278,fffffd806655eb00,ffff80002e901b80,0,fffffd806655e200,0) at sosend+0x62a sys/kern/uipc_socket.c:646 sendit(ffff80002179a2a8,3,ffff80002e901d00,0,ffff80002e901e00) at sendit+0x64d sys/kern/uipc_syscalls.c:694 sys_sendmsg(ffff80002179a2a8,ffff80002e901da8,ffff80002e901e00) at sys_sendmsg+0x198 sys/kern/uipc_syscalls.c:601 syscall(ffff80002e901e70) at syscall+0x447 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x77775dd6350, 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(ffffffff8254ebcf) at panic+0x161 sys/kern/subr_prf.c:198 tcp_output(ffff800000cdf018) at tcp_output+0x2a72 sys/netinet/tcp_output.c:727 tcp_send(fffffd806a612278,fffffd806655e000,fffffd806655eb00,fffffd806655e200) at tcp_send+0xc4 sys/netinet/tcp_usrreq.c:953 sosend(fffffd806a612278,fffffd806655eb00,ffff80002e901b80,0,fffffd806655e200,0) at sosend+0x62a pru_send sys/sys/protosw.h:331 [inline] sosend(fffffd806a612278,fffffd806655eb00,ffff80002e901b80,0,fffffd806655e200,0) at sosend+0x62a sys/kern/uipc_socket.c:646 sendit(ffff80002179a2a8,3,ffff80002e901d00,0,ffff80002e901e00) at sendit+0x64d sys/kern/uipc_syscalls.c:694 sys_sendmsg(ffff80002179a2a8,ffff80002e901da8,ffff80002e901e00) at sys_sendmsg+0x198 sys/kern/uipc_syscalls.c:601 syscall(ffff80002e901e70) at syscall+0x447 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x77775dd6350, count: -9 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff80002e9017f0 rbx 0x68 rdx 0xffff800000bc3a00 rcx 0 rax 0xffff80002179a2a8 r8 0x101010101010101 r9 0x8080808080808080 r10 0x9ebbccf4b9fd36ca r11 0xd94415c7214bfb30 r12 0 r13 0 r14 0 r15 0x1 rip 0xffffffff82298ac8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80002e9017e0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (syz-executor.0) pid=9905 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff80002179ba48,0xffffffff829fae78 process=0xffff80002179c028 user=0xffff80002e8fc000, vmspace=0xfffffd807b56d330 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 95005 474513 47552 0 2 0 syz-executor.6 95005 519796 47552 0 3 0x4000080 fsleep syz-executor.6 72710 103600 27963 0 2 0 syz-executor.0 *72710 9905 27963 0 7 0x4000000 syz-executor.0 96483 65785 30483 0 2 0 syz-executor.7 96483 167057 30483 0 3 0x4000080 fsleep syz-executor.7 68997 65256 22489 0 2 0x2 syz-executor.5 53684 112507 22489 0 3 0x82 nanoslp syz-executor.4 47552 179725 22489 0 3 0x82 nanoslp syz-executor.6 80406 120790 0 0 3 0x14200 bored sosplice 30483 435735 22489 0 3 0x82 nanoslp syz-executor.7 36487 441522 22489 0 2 0x2 syz-executor.3 68063 174071 22489 0 2 0x2 syz-executor.1 46637 309378 22489 0 3 0x82 nanoslp syz-executor.2 27963 70961 22489 0 3 0x82 nanoslp syz-executor.0 22489 111021 33136 0 3 0x82 thrsleep syz-fuzzer 22489 476867 33136 0 3 0x4000082 nanoslp syz-fuzzer 22489 523039 33136 0 3 0x4000082 wait syz-fuzzer 22489 281628 33136 0 3 0x4000082 kqread syz-fuzzer 22489 322981 33136 0 3 0x4000082 thrsleep syz-fuzzer 22489 238634 33136 0 3 0x4000082 wait syz-fuzzer 22489 390782 33136 0 3 0x4000082 wait syz-fuzzer 22489 419839 33136 0 3 0x4000082 thrsleep syz-fuzzer 22489 242990 33136 0 3 0x4000082 thrsleep syz-fuzzer 22489 122114 33136 0 3 0x4000082 wait syz-fuzzer 22489 184709 33136 0 3 0x4000082 wait syz-fuzzer 22489 351889 33136 0 3 0x4000082 wait syz-fuzzer 22489 383806 33136 0 3 0x4000082 wait syz-fuzzer 22489 492976 33136 0 3 0x4000082 wait syz-fuzzer 33136 231022 74553 0 3 0x10008a sigsusp ksh 74553 205512 33373 0 3 0x9a kqread sshd 77013 213630 1 0 3 0x100083 ttyin getty 33373 220182 1 0 3 0x88 kqread sshd 6922 257291 71612 73 3 0x1100090 kqread syslogd 71612 460768 1 0 3 0x100082 netio syslogd 94252 479944 1 0 3 0x100080 kqread resolvd 11891 237982 99675 77 3 0x100092 kqread dhcpleased 83964 420361 99675 77 3 0x100092 kqread dhcpleased 99675 271023 1 0 3 0x80 kqread dhcpleased 27442 517540 0 0 3 0x14200 bored smr 40488 466465 0 0 2 0x14200 zerothread 4920 320651 0 0 3 0x14200 aiodoned aiodoned 32450 81924 0 0 3 0x14200 syncer update 37391 315989 0 0 3 0x14200 cleaner cleaner 92259 340790 0 0 3 0x14200 reaper reaper 61942 393433 0 0 3 0x14200 pgdaemon pagedaemon 37793 95839 0 0 3 0x14200 bored viomb 51136 345645 0 0 3 0x40014200 acpi0 acpi0 66674 377075 0 0 3 0x14200 bored softnet 12701 181319 0 0 3 0x14200 bored softnet 99851 471055 0 0 3 0x14200 bored softnet 99920 467366 0 0 3 0x14200 bored softnet 30214 487523 0 0 3 0x14200 bored systqmp 59622 517437 0 0 3 0x14200 bored systq 66921 373730 0 0 3 0x40014200 bored softclock 41741 418758 0 0 3 0x40014200 idle0 1 18260 0 0 3 0x82 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 10188 6406K 7113K 78643K 17289 0 pcb 14 13K 14K 78643K 366 0 rtable 199 11K 11K 78643K 751 0 ifaddr 90 19K 19K 78643K 579 0 sysctl 2 0K 2K 78643K 7 0 counters 26 17K 17K 78643K 52 0 ioctlops 0 0K 4K 78643K 651 0 iov 0 0K 16K 78643K 356 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1395 87K 88K 78643K 3071 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 23 0 VM map 2 0K 0K 78643K 2 0 sem 12 0K 0K 78643K 65 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 13 45K 65K 78643K 1947 0 proc 58 59K 75K 78643K 719 0 subproc 104 6K 6K 78643K 195 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 44 0 in_multi 81 5K 7K 78643K 248 0 ether_multi 1 0K 0K 78643K 30 0 mrt 0 0K 0K 78643K 10 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 163 731K 731K 78643K 163 0 exec 0 0K 2K 78643K 1167 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 275 263K 264K 78643K 11628 0 UVM aobj 23 2K 2K 78643K 23 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 15 0 NDP 12 0K 2K 78643K 69 0 temp 128 4718K 4846K 78643K 23546 0 kqueue 12 18K 22K 78643K 114 0 SYN cache 2 16K 16K 78643K 2 0 ddb> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle rtpcb 120 113 0 110 1 0 1 1 0 8 0 rtentry 112 197 0 115 4 0 4 4 0 8 0 unpcb 144 1087 0 1074 19 16 3 6 0 8 2 syncache 296 15 0 15 4 4 0 1 0 8 0 tcpqe 32 47 0 47 3 3 0 1 0 8 0 tcpcb 768 1462 0 1428 39 34 5 25 0 8 1 arp 88 32 0 18 1 0 1 1 0 8 0 inpcb 336 3330 0 3316 38 31 7 16 0 8 5 nd6 48 48 0 28 1 0 1 1 0 8 0 pkpcb 40 10 0 10 2 2 0 1 0 8 0 kcovpl 48 15 0 7 1 0 1 1 0 8 0 ppxss 1160 8 0 8 2 2 0 1 0 8 0 pfrktable 1344 39 0 32 1 0 1 1 0 8 0 pfanchor 1280 16 0 9 1 0 1 1 0 8 0 pftag 88 20 0 18 1 0 1 1 0 8 0 pfrule 1360 288 0 269 2 0 2 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 882 0 517 34 10 24 29 0 8 0 art_table 32 883 0 517 4 0 4 4 0 8 0 art_node 16 196 0 124 1 0 1 1 0 8 0 sysvmsgpl 40 6 0 4 1 0 1 1 0 8 0 semapl 112 63 0 53 1 0 1 1 0 8 0 shmpl 112 20 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 4173 0 2737 91 0 91 91 0 8 0 ffsino 240 4173 0 2737 86 0 86 86 0 8 0 nchpl 144 6784 0 5156 63 0 63 63 0 8 0 uvmvnodes 80 5647 0 0 116 0 116 116 0 8 0 vnodes 216 5647 0 0 314 0 314 314 0 8 0 namei 1024 25139 0 25138 2 1 1 2 0 8 0 vcpupl 2048 55 0 0 7 0 7 7 0 8 0 vmpool 536 55 0 0 4 0 4 4 0 8 0 pfiaddrpl 120 17 0 9 1 0 1 1 0 8 0 kstatmem 264 76 0 52 2 0 2 2 0 8 0 scxspl 216 18947 0 18947 11 10 1 8 0 8 1 plimitpl 152 413 0 399 1 0 1 1 0 8 0 sigapl 424 2221 0 2178 6 0 6 6 0 8 0 futexpl 64 22816 0 22814 1 0 1 1 0 8 0 knotepl 120 23928 0 23848 15 11 4 8 0 8 1 kqueuepl 184 612 0 603 9 8 1 4 0 8 0 pipepl 288 370 0 342 8 1 7 7 0 8 4 fdescpl 432 2204 0 2180 4 0 4 4 0 8 0 filepl 120 16524 0 16283 29 17 12 17 0 8 4 lockfpl 104 645 0 643 3 2 1 2 0 8 0 lockfspl 48 183 0 181 1 0 1 1 0 8 0 sessionpl 144 30 0 14 1 0 1 1 0 8 0 pgrppl 48 98 0 82 1 0 1 1 0 8 0 ucredpl 104 1597 0 1587 1 0 1 1 0 8 0 zombiepl 144 2180 0 2178 1 0 1 1 0 8 0 processpl 1000 2221 0 2178 7 1 6 6 0 8 0 procpl 672 4886 0 4827 13 6 7 8 0 8 1 sosppl 168 16 0 16 3 3 0 1 0 8 0 sockpl 456 4540 0 4510 100 90 10 35 0 8 5 mcl64k 65536 260 0 260 1 0 1 1 0 8 1 mcl16k 16384 9 0 9 4 4 0 1 0 8 0 mcl12k 12288 43 0 43 4 4 0 1 0 8 0 mcl9k 9216 20 0 20 5 5 0 1 0 8 0 mcl8k 8192 110 0 110 3 2 1 1 0 8 1 mcl4k 4096 252 0 252 2 1 1 1 0 8 1 mcl2k2 2112 22 0 22 5 4 1 1 0 8 1 mcl2k 2048 71553 0 71382 38 15 23 23 0 8 0 mtagpl 96 1373 0 668 23 5 18 18 0 8 0 mbufpl 256 130339 0 129430 70 11 59 59 0 8 0 bufpl 288 6487 0 141 454 0 454 454 0 8 0 anonpl 24 374057 0 360014 103 5 98 101 0 188 0 amapchunkpl 152 33071 0 32520 42 17 25 37 0 158 0 amappl16 200 4619 0 4035 36 4 32 33 0 8 1 amappl15 192 487 0 481 1 0 1 1 0 8 0 amappl14 184 457 0 452 1 0 1 1 0 8 0 amappl13 176 660 0 657 1 0 1 1 0 8 0 amappl12 168 529 0 523 1 0 1 1 0 8 0 amappl11 160 180 0 165 1 0 1 1 0 8 0 amappl10 152 29 0 23 1 0 1 1 0 8 0 amappl9 144 490 0 481 1 0 1 1 0 8 0 amappl8 136 656 0 598 3 1 2 3 0 8 0 amappl7 128 152 0 133 1 0 1 1 0 8 0 amappl6 120 232 0 215 2 1 1 2 0 8 0 amappl5 112 1421 0 1411 1 0 1 1 0 8 0 amappl4 104 1413 0 1385 2 1 1 2 0 8 0 amappl3 96 6446 0 6403 2 0 2 2 0 8 0 amappl2 88 1121 0 1085 2 1 1 2 0 8 0 amappl1 80 54958 0 54381 19 4 15 19 0 8 1 amappl 88 10986 0 10838 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 22 0 0 1 0 1 1 0 8 0 uaddrrnd 24 2259 0 2180 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2259 0 2180 1 0 1 1 0 8 0 vmmpekpl 168 19467 0 19414 3 0 3 3 0 8 0 vmmpepl 168 215563 0 213196 144 21 123 134 0 357 5 vmsppl 272 2258 0 2180 7 1 6 6 0 8 0 rwobjpl 24 56623 0 49434 44 0 44 44 0 8 0 pdppl 4096 4524 0 4415 275 156 119 119 0 8 10 pvpl 32 850824 0 832849 242 77 165 239 0 265 0 pmappl 216 2258 0 2180 5 0 5 5 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 1129 0 235 26 0 26 26 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(ffffffff8254ebcf) at panic+0x161 sys/kern/subr_prf.c:198 tcp_output(ffff800000cdf018) at tcp_output+0x2a72 sys/netinet/tcp_output.c:727 tcp_send(fffffd806a612278,fffffd806655e000,fffffd806655eb00,fffffd806655e200) at tcp_send+0xc4 sys/netinet/tcp_usrreq.c:953 sosend(fffffd806a612278,fffffd806655eb00,ffff80002e901b80,0,fffffd806655e200,0) at sosend+0x62a pru_send sys/sys/protosw.h:331 [inline] sosend(fffffd806a612278,fffffd806655eb00,ffff80002e901b80,0,fffffd806655e200,0) at sosend+0x62a sys/kern/uipc_socket.c:646 sendit(ffff80002179a2a8,3,ffff80002e901d00,0,ffff80002e901e00) at sendit+0x64d sys/kern/uipc_syscalls.c:694 sys_sendmsg(ffff80002179a2a8,ffff80002e901da8,ffff80002e901e00) at sys_sendmsg+0x198 sys/kern/uipc_syscalls.c:601 syscall(ffff80002e901e70) at syscall+0x447 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x77775dd6350, 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(ffffffff8254ebcf) at panic+0x161 sys/kern/subr_prf.c:198 tcp_output(ffff800000cdf018) at tcp_output+0x2a72 sys/netinet/tcp_output.c:727 tcp_send(fffffd806a612278,fffffd806655e000,fffffd806655eb00,fffffd806655e200) at tcp_send+0xc4 sys/netinet/tcp_usrreq.c:953 sosend(fffffd806a612278,fffffd806655eb00,ffff80002e901b80,0,fffffd806655e200,0) at sosend+0x62a pru_send sys/sys/protosw.h:331 [inline] sosend(fffffd806a612278,fffffd806655eb00,ffff80002e901b80,0,fffffd806655e200,0) at sosend+0x62a sys/kern/uipc_socket.c:646 sendit(ffff80002179a2a8,3,ffff80002e901d00,0,ffff80002e901e00) at sendit+0x64d sys/kern/uipc_syscalls.c:694 sys_sendmsg(ffff80002179a2a8,ffff80002e901da8,ffff80002e901e00) at sys_sendmsg+0x198 sys/kern/uipc_syscalls.c:601 syscall(ffff80002e901e70) at syscall+0x447 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x77775dd6350, count: -9