login: panic: tcp_output Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *179592 27489 0 0 0x4000000 0 syz-executor.0 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8255003c) at panic+0x161 sys/kern/subr_prf.c:198 tcp_output(ffff800000bbfb00) at tcp_output+0x2a72 sys/netinet/tcp_output.c:727 tcp_send(fffffd807a312808,fffffd8075830800,fffffd8075830a00,fffffd8075830c00) at tcp_send+0xc4 sys/netinet/tcp_usrreq.c:953 sosend(fffffd807a312808,fffffd8075830a00,ffff80002176b560,0,fffffd8075830c00,0) at sosend+0x62a pru_send sys/sys/protosw.h:331 [inline] sosend(fffffd807a312808,fffffd8075830a00,ffff80002176b560,0,fffffd8075830c00,0) at sosend+0x62a sys/kern/uipc_socket.c:646 sendit(ffff8000216f0fc0,3,ffff80002176b6e0,0,ffff80002176b7e0) at sendit+0x64d sys/kern/uipc_syscalls.c:694 sys_sendmsg(ffff8000216f0fc0,ffff80002176b788,ffff80002176b7e0) at sys_sendmsg+0x198 sys/kern/uipc_syscalls.c:601 syscall(ffff80002176b850) at syscall+0x447 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x2a139a870d0, 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(ffffffff8255003c) at panic+0x161 sys/kern/subr_prf.c:198 tcp_output(ffff800000bbfb00) at tcp_output+0x2a72 sys/netinet/tcp_output.c:727 tcp_send(fffffd807a312808,fffffd8075830800,fffffd8075830a00,fffffd8075830c00) at tcp_send+0xc4 sys/netinet/tcp_usrreq.c:953 sosend(fffffd807a312808,fffffd8075830a00,ffff80002176b560,0,fffffd8075830c00,0) at sosend+0x62a pru_send sys/sys/protosw.h:331 [inline] sosend(fffffd807a312808,fffffd8075830a00,ffff80002176b560,0,fffffd8075830c00,0) at sosend+0x62a sys/kern/uipc_socket.c:646 sendit(ffff8000216f0fc0,3,ffff80002176b6e0,0,ffff80002176b7e0) at sendit+0x64d sys/kern/uipc_syscalls.c:694 sys_sendmsg(ffff8000216f0fc0,ffff80002176b788,ffff80002176b7e0) at sys_sendmsg+0x198 sys/kern/uipc_syscalls.c:601 syscall(ffff80002176b850) at syscall+0x447 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x2a139a870d0, count: -9 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff80002176b1d0 rbx 0x68 rdx 0xffff800000d32440 rcx 0 rax 0xffff8000216f0fc0 r8 0x101010101010101 r9 0x8080808080808080 r10 0xcd80d7cc7798373f r11 0x6584e2be20f38f69 r12 0 r13 0 r14 0 r15 0x1 rip 0xffffffff81aa3258 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80002176b1c0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (syz-executor.0) pid=179592 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=84, nice=20 forw=0xffffffffffffffff, list=0xffff8000216f0d20,0xffffffff829b1c28 process=0xffff80002e8eec00 user=0xffff800021766000, vmspace=0xfffffd805b91d780 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 27489 370016 9444 0 2 0 syz-executor.0 *27489 179592 9444 0 7 0x4000000 syz-executor.0 1214 199539 93014 0 2 0 syz-executor.7 1214 441570 93014 0 3 0x4000080 fsleep syz-executor.7 31514 168492 46097 0 2 0 syz-executor.5 31514 85177 46097 0 3 0x4000080 fsleep syz-executor.5 61798 326734 51963 0 2 0 syz-executor.1 61798 19949 51963 0 3 0x4000080 rest syz-executor.1 61798 153476 51963 0 3 0x4000080 fsleep syz-executor.1 23753 7487 12714 0 2 0x2 syz-executor.3 50051 255903 12714 0 3 0x82 nanoslp syz-executor.6 40212 204429 1 0 3 0x100083 ttyin getty 46097 31301 12714 0 3 0x82 nanoslp syz-executor.5 51963 242745 12714 0 3 0x82 nanoslp syz-executor.1 9444 306805 12714 0 3 0x82 nanoslp syz-executor.0 79442 315470 12714 0 3 0x82 piperd syz-executor.4 51858 160222 12714 0 3 0x82 nanoslp syz-executor.2 93014 368921 12714 0 3 0x82 nanoslp syz-executor.7 51203 177970 0 0 3 0x14280 nfsidl nfsio 1616 308701 0 0 3 0x14280 nfsidl nfsio 65357 438353 0 0 3 0x14280 nfsidl nfsio 99020 409930 0 0 3 0x14280 nfsidl nfsio 546 182024 0 0 3 0x14280 nfsidl nfsio 57386 262806 0 0 3 0x14280 nfsidl nfsio 17026 474134 0 0 3 0x14280 nfsidl nfsio 44768 1305 0 0 3 0x14280 nfsidl nfsio 91383 326735 0 0 3 0x14280 nfsidl nfsio 31482 478241 0 0 3 0x14280 nfsidl nfsio 19087 387470 0 0 3 0x14280 nfsidl nfsio 71118 360251 0 0 3 0x14280 nfsidl nfsio 80850 430307 0 0 3 0x14280 nfsidl nfsio 86945 289254 0 0 3 0x14280 nfsidl nfsio 48461 174476 0 0 3 0x14280 nfsidl nfsio 97101 448632 0 0 3 0x14280 nfsidl nfsio 6690 404634 0 0 3 0x14280 nfsidl nfsio 66535 321563 0 0 3 0x14280 nfsidl nfsio 43115 456255 0 0 3 0x14280 nfsidl nfsio 30566 255560 0 0 3 0x14280 nfsidl nfsio 59726 450387 0 0 3 0x14200 bored sosplice 12714 256899 51250 0 3 0x82 thrsleep syz-fuzzer 12714 17486 51250 0 3 0x4000082 nanoslp syz-fuzzer 12714 122826 51250 0 3 0x4000082 thrsleep syz-fuzzer 12714 202157 51250 0 3 0x4000082 wait syz-fuzzer 12714 402870 51250 0 3 0x4000082 wait syz-fuzzer 12714 521532 51250 0 3 0x4000082 thrsleep syz-fuzzer 12714 329951 51250 0 3 0x4000082 wait syz-fuzzer 12714 416508 51250 0 3 0x4000082 kqread syz-fuzzer 12714 129656 51250 0 3 0x4000082 thrsleep syz-fuzzer 12714 153765 51250 0 3 0x4000082 wait syz-fuzzer 12714 311345 51250 0 3 0x4000082 wait syz-fuzzer 12714 391914 51250 0 3 0x4000082 wait syz-fuzzer 12714 502488 51250 0 3 0x4000082 wait syz-fuzzer 12714 235427 51250 0 3 0x4000082 wait syz-fuzzer 51250 469667 98531 0 3 0x10008a sigsusp ksh 98531 260972 38097 0 3 0x9a kqread sshd 38097 476926 1 0 3 0x88 kqread sshd 20064 171386 35106 73 3 0x1100090 kqread syslogd 35106 166978 1 0 3 0x100082 netio syslogd 15072 258708 1 0 3 0x100080 kqread resolvd 97862 321054 16102 77 3 0x100092 kqread dhcpleased 47514 91059 16102 77 3 0x100092 kqread dhcpleased 16102 188215 1 0 3 0x80 kqread dhcpleased 13571 506894 0 0 3 0x14200 bored smr 58183 97543 0 0 2 0x14200 zerothread 37333 135074 0 0 3 0x14200 aiodoned aiodoned 95108 204040 0 0 3 0x14200 syncer update 10484 339845 0 0 3 0x14200 cleaner cleaner 8953 429269 0 0 3 0x14200 reaper reaper 46925 29860 0 0 3 0x14200 pgdaemon pagedaemon 33444 459209 0 0 3 0x14200 bored viomb 65847 211095 0 0 3 0x40014200 acpi0 acpi0 9667 411245 0 0 3 0x14200 bored softnet 28982 133698 0 0 3 0x14200 bored softnet 35934 174289 0 0 3 0x14200 bored softnet 5657 197781 0 0 3 0x14200 bored softnet 80130 147522 0 0 3 0x14200 bored systqmp 61663 259449 0 0 3 0x14200 bored systq 49549 428369 0 0 3 0x40014200 bored softclock 85715 520914 0 0 3 0x40014200 idle0 1 133430 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 10235 7150K 7803K 78643K 29344 0 pcb 13 22K 27K 78643K 2641 0 rtable 298 29K 29K 78643K 4007 0 ifaddr 133 33K 36K 78643K 2047 0 sysctl 3 1K 1K 78643K 9 0 counters 28 17K 17K 78643K 290 0 ioctlops 0 0K 4K 78643K 3888 0 iov 0 0K 28K 78643K 1834 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1442 90K 91K 78643K 8477 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 115 0 VM map 2 0K 0K 78643K 2 0 sem 20 5K 10K 78643K 41 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 14 49K 69K 78643K 13938 0 sigio 0 0K 0K 78643K 218 0 proc 62 59K 75K 78643K 2589 0 subproc 104 6K 7K 78643K 830 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 402 0 in_multi 100 6K 7K 78643K 946 0 ether_multi 1 0K 0K 78643K 56 0 mrt 1 0K 0K 78643K 73 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 229 1023K 1023K 78643K 229 0 exec 0 0K 2K 78643K 3868 0 pfkey data 0 0K 0K 78643K 11 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 527 1272K 1282K 78643K 77924 0 UVM aobj 131 4K 4K 78643K 142 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 618 0 NDP 19 0K 2K 78643K 405 0 temp 154 4719K 66415K 78643K 117515 0 kqueue 12 18K 28K 78643K 1285 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 1032 0 1029 14 13 1 3 0 8 0 rtentry 112 1083 0 977 5 1 4 4 0 8 0 unpcb 144 11756 0 11743 94 85 9 10 0 8 8 syncache 296 150 0 150 19 19 0 1 0 8 0 tcpqe 32 155 0 155 12 12 0 1 0 8 0 tcpcb 768 33044 0 33016 1012 1001 11 57 0 8 8 arp 88 182 0 164 1 0 1 1 0 8 0 ipq 40 12 0 12 7 7 0 1 0 8 0 ipqe 40 32 0 32 7 7 0 1 0 8 0 inpcb 336 41655 0 41643 432 422 10 24 0 8 8 ip6q 72 4 0 4 1 1 0 1 0 8 0 ip6af 40 7 0 7 1 1 0 1 0 8 0 nd6 48 223 0 195 1 0 1 1 0 8 0 pkpcb 40 24 0 24 7 7 0 1 0 8 0 kcovpl 48 62 0 54 1 0 1 1 0 8 0 ppxss 1160 153 0 153 20 19 1 1 0 8 1 pfstscr 40 41 0 31 1 0 1 1 0 8 0 pfosfp 40 41 0 38 1 0 1 1 0 8 0 pfosfpen 112 41 0 36 1 0 1 1 0 8 0 pfrke_plain 168 5 0 4 2 1 1 1 0 8 0 pfrktable 1344 427 0 404 10 8 2 3 0 8 0 pfanchor 1280 503 0 128 32 0 32 32 0 8 0 pftag 88 19 0 13 2 1 1 1 0 8 0 pfqueue 264 139 0 139 2 2 0 1 0 8 0 pfstitem 24 37 0 21 1 0 1 1 0 8 0 pfstkey 120 164 0 155 1 0 1 1 0 8 0 pfstate 336 89 0 80 1 0 1 1 0 8 0 pfrule 1360 785 0 663 14 3 11 11 0 8 0 rttmr 136 20 0 20 8 8 0 1 0 8 0 art_heap8 4096 2 0 1 2 1 1 2 0 8 0 art_heap4 256 4531 0 4059 66 36 30 30 0 8 0 art_table 32 4533 0 4060 4 0 4 4 0 8 0 art_node 16 1068 0 975 1 0 1 1 0 8 0 sysvmsgpl 40 27 0 11 1 0 1 1 0 8 0 semupl 112 6 0 6 2 2 0 1 0 8 0 semapl 112 20 0 2 1 0 1 1 0 8 0 shmpl 112 139 0 11 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 20416 0 18951 92 0 92 92 0 8 0 ffsino 240 20416 0 18951 87 0 87 87 0 8 0 nchpl 144 39229 0 37595 63 0 63 63 0 8 0 rtmask 32 21 0 20 4 3 1 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 140521 0 140520 7 6 1 2 0 8 0 vcpupl 2048 352 0 0 44 0 44 44 0 8 0 vmpool 536 459 0 107 25 1 24 24 0 8 0 pfiaddrpl 120 242 0 161 8 5 3 3 0 8 0 kstatmem 264 526 0 492 3 0 3 3 0 8 0 scsiplug 72 15 0 15 4 4 0 1 0 8 0 scxspl 216 119881 0 119881 31 30 1 8 0 8 1 plimitpl 152 2487 0 2473 1 0 1 1 0 8 0 sigapl 424 14140 0 14076 8 0 8 8 0 8 0 futexpl 64 160988 0 160985 4 3 1 1 0 8 0 knotepl 120 265649 0 265568 123 114 9 17 0 8 4 kqueuepl 184 2624 0 2616 23 22 1 4 0 8 0 pipepl 288 2220 0 2192 44 41 3 7 0 8 0 fdescpl 432 14102 0 14077 4 0 4 4 0 8 0 filepl 120 120094 0 119851 159 143 16 19 0 8 6 lockfpl 104 3365 0 3363 6 5 1 2 0 8 0 lockfspl 48 1050 0 1048 1 0 1 1 0 8 0 sessionpl 144 82 0 66 1 0 1 1 0 8 0 pgrppl 48 362 0 346 1 0 1 1 0 8 0 ucredpl 104 13461 0 13451 1 0 1 1 0 8 0 zombiepl 144 14078 0 14076 2 1 1 1 0 8 0 processpl 1000 14140 0 14076 10 1 9 9 0 8 0 procpl 672 36672 0 36590 37 29 8 10 0 8 0 sosppl 168 102 0 101 15 14 1 1 0 8 0 sockpl 456 54718 0 54686 1082 1067 15 46 0 8 8 mcl64k 65536 524 0 520 21 20 1 2 0 8 0 mcl16k 16384 165 0 165 34 33 1 1 0 8 1 mcl12k 12288 436 0 436 29 28 1 1 0 8 1 mcl9k 9216 186 0 186 27 26 1 1 0 8 1 mcl8k 8192 935 0 935 24 23 1 1 0 8 1 mcl4k 4096 1818 0 1818 17 16 1 3 0 8 1 mcl2k2 2112 125 0 125 26 25 1 1 0 8 1 mcl2k 2048 99336 0 99275 44 35 9 18 0 8 1 mtagpl 96 2132 0 1878 18 11 7 11 0 8 0 mbufpl 256 282533 0 282084 103 67 36 55 0 8 0 bufpl 288 27252 0 20851 458 0 458 458 0 8 0 anonpl 24 2733645 0 2715071 352 217 135 154 0 188 2 amapchunkpl 152 268794 0 268014 128 90 38 44 0 158 1 amappl16 200 41809 0 41021 178 132 46 55 0 8 0 amappl15 192 2760 0 2753 1 0 1 1 0 8 0 amappl14 184 2106 0 2098 1 0 1 1 0 8 0 amappl13 176 1702 0 1701 1 0 1 1 0 8 0 amappl12 168 2176 0 2170 1 0 1 1 0 8 0 amappl11 160 2034 0 2016 1 0 1 1 0 8 0 amappl10 152 2584 0 2580 2 1 1 1 0 8 0 amappl9 144 2473 0 2469 1 0 1 1 0 8 0 amappl8 136 2175 0 2068 4 0 4 4 0 8 0 amappl7 128 816 0 795 1 0 1 1 0 8 0 amappl6 120 2506 0 2485 2 1 1 2 0 8 0 amappl5 112 11063 0 11051 1 0 1 1 0 8 0 amappl4 104 7016 0 6984 3 2 1 2 0 8 0 amappl3 96 43009 0 42958 2 0 2 2 0 8 0 amappl2 88 3957 0 3915 2 0 2 2 0 8 0 amappl1 80 345826 0 345215 21 6 15 19 0 8 0 amappl 88 76057 0 75822 6 0 6 6 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 72 141 0 11 3 0 3 3 0 8 0 uaddrrnd 24 14561 0 14184 3 0 3 3 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 14561 0 14184 3 0 3 3 0 8 0 vmmpekpl 168 93407 0 93313 6 1 5 5 0 8 0 vmmpepl 168 1387120 0 1383825 371 193 178 190 0 357 16 vmsppl 272 14560 0 14184 27 1 26 26 0 8 0 rwobjpl 24 336144 0 328217 54 5 49 50 0 8 0 pdppl 4096 29128 0 28720 1091 675 416 416 0 8 8 pvpl 32 5258037 0 5239391 541 353 188 240 0 265 0 pmappl 216 14560 0 14184 22 0 22 22 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 2614 0 1381 36 0 36 36 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(ffffffff8255003c) at panic+0x161 sys/kern/subr_prf.c:198 tcp_output(ffff800000bbfb00) at tcp_output+0x2a72 sys/netinet/tcp_output.c:727 tcp_send(fffffd807a312808,fffffd8075830800,fffffd8075830a00,fffffd8075830c00) at tcp_send+0xc4 sys/netinet/tcp_usrreq.c:953 sosend(fffffd807a312808,fffffd8075830a00,ffff80002176b560,0,fffffd8075830c00,0) at sosend+0x62a pru_send sys/sys/protosw.h:331 [inline] sosend(fffffd807a312808,fffffd8075830a00,ffff80002176b560,0,fffffd8075830c00,0) at sosend+0x62a sys/kern/uipc_socket.c:646 sendit(ffff8000216f0fc0,3,ffff80002176b6e0,0,ffff80002176b7e0) at sendit+0x64d sys/kern/uipc_syscalls.c:694 sys_sendmsg(ffff8000216f0fc0,ffff80002176b788,ffff80002176b7e0) at sys_sendmsg+0x198 sys/kern/uipc_syscalls.c:601 syscall(ffff80002176b850) at syscall+0x447 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x2a139a870d0, 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(ffffffff8255003c) at panic+0x161 sys/kern/subr_prf.c:198 tcp_output(ffff800000bbfb00) at tcp_output+0x2a72 sys/netinet/tcp_output.c:727 tcp_send(fffffd807a312808,fffffd8075830800,fffffd8075830a00,fffffd8075830c00) at tcp_send+0xc4 sys/netinet/tcp_usrreq.c:953 sosend(fffffd807a312808,fffffd8075830a00,ffff80002176b560,0,fffffd8075830c00,0) at sosend+0x62a pru_send sys/sys/protosw.h:331 [inline] sosend(fffffd807a312808,fffffd8075830a00,ffff80002176b560,0,fffffd8075830c00,0) at sosend+0x62a sys/kern/uipc_socket.c:646 sendit(ffff8000216f0fc0,3,ffff80002176b6e0,0,ffff80002176b7e0) at sendit+0x64d sys/kern/uipc_syscalls.c:694 sys_sendmsg(ffff8000216f0fc0,ffff80002176b788,ffff80002176b7e0) at sys_sendmsg+0x198 sys/kern/uipc_syscalls.c:601 syscall(ffff80002176b850) at syscall+0x447 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x2a139a870d0, count: -9