panic: tcp_output Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *105831 65474 0 0 0x4000000 0 syz-executor.7 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(ffff800000d3f680) at tcp_output+0x2a72 sys/netinet/tcp_output.c:727 tcp_send(fffffd80754f7038,fffffd80628de500,0,fffffd80628de000) at tcp_send+0xc4 sys/netinet/tcp_usrreq.c:944 sosend(fffffd80754f7038,0,ffff80002e8f5630,0,fffffd80628de000,0) at sosend+0x62a pru_send sys/sys/protosw.h:331 [inline] sosend(fffffd80754f7038,0,ffff80002e8f5630,0,fffffd80628de000,0) at sosend+0x62a sys/kern/uipc_socket.c:646 sendit(ffff8000216fdce0,7,ffff80002e8f57b0,0,ffff80002e8f58b0) at sendit+0x64d sys/kern/uipc_syscalls.c:694 sys_sendmsg(ffff8000216fdce0,ffff80002e8f5858,ffff80002e8f58b0) at sys_sendmsg+0x198 sys/kern/uipc_syscalls.c:601 syscall(ffff80002e8f5920) at syscall+0x447 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xbe3503bcdb0, 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(ffff800000d3f680) at tcp_output+0x2a72 sys/netinet/tcp_output.c:727 tcp_send(fffffd80754f7038,fffffd80628de500,0,fffffd80628de000) at tcp_send+0xc4 sys/netinet/tcp_usrreq.c:944 sosend(fffffd80754f7038,0,ffff80002e8f5630,0,fffffd80628de000,0) at sosend+0x62a pru_send sys/sys/protosw.h:331 [inline] sosend(fffffd80754f7038,0,ffff80002e8f5630,0,fffffd80628de000,0) at sosend+0x62a sys/kern/uipc_socket.c:646 sendit(ffff8000216fdce0,7,ffff80002e8f57b0,0,ffff80002e8f58b0) at sendit+0x64d sys/kern/uipc_syscalls.c:694 sys_sendmsg(ffff8000216fdce0,ffff80002e8f5858,ffff80002e8f58b0) at sys_sendmsg+0x198 sys/kern/uipc_syscalls.c:601 syscall(ffff80002e8f5920) at syscall+0x447 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xbe3503bcdb0, count: -9 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff80002e8f52a0 rbx 0x68 rdx 0xffff800000cdff00 rcx 0 rax 0xffff8000216fdce0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x76b18f39019fedf r11 0x1656abca590352a5 r12 0 r13 0 r14 0 r15 0x1 rip 0xffffffff81685218 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80002e8f5290 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (syz-executor.7) pid=105831 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff80002178d270,0xffffffff82a18910 process=0xffff80002807d3d0 user=0xffff80002e8f0000, vmspace=0xfffffd806ce8c890 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 65474 42483 59693 0 2 0 syz-executor.7 65474 272602 59693 0 3 0x4000080 netcon2 syz-executor.7 *65474 105831 59693 0 7 0x4000000 syz-executor.7 86085 236672 29312 0 3 0x80 nanoslp syz-executor.6 86085 301977 29312 0 3 0x4000080 netcon2 syz-executor.6 86085 397954 29312 0 3 0x4000080 fsleep syz-executor.6 86085 247705 29312 0 3 0x4000080 fsleep syz-executor.6 7954 62192 48902 0 3 0x80 nanoslp syz-executor.2 7954 356644 48902 0 3 0x4000080 netcon2 syz-executor.2 7954 505076 48902 0 3 0x4000080 fsleep syz-executor.2 84975 237604 43151 0 2 0 syz-executor.3 84975 307756 43151 0 3 0x4000080 netcon2 syz-executor.3 84975 46597 43151 0 3 0x4000080 fsleep syz-executor.3 15293 214699 80046 0 3 0x80 nanoslp syz-executor.0 15293 37360 80046 0 3 0x4000080 netcon2 syz-executor.0 15293 199718 80046 0 3 0x4000080 fsleep syz-executor.0 79146 459226 28217 0 3 0x80 nanoslp syz-executor.5 79146 109739 28217 0 3 0x4000080 netcon2 syz-executor.5 79146 202403 28217 0 3 0x4000080 fsleep syz-executor.5 59693 412881 96366 0 3 0x82 nanoslp syz-executor.7 29312 81071 96366 0 3 0x82 nanoslp syz-executor.6 78659 445800 96366 0 3 0x82 nanoslp syz-executor.4 57574 74366 0 0 3 0x14200 acct acct 55177 176126 0 0 3 0x14280 nfsidl nfsio 63378 466693 0 0 3 0x14280 nfsidl nfsio 74629 40361 0 0 3 0x14280 nfsidl nfsio 31302 103868 0 0 3 0x14280 nfsidl nfsio 83211 295612 0 0 3 0x14280 nfsidl nfsio 84771 86416 0 0 3 0x14280 nfsidl nfsio 78981 182087 0 0 3 0x14280 nfsidl nfsio 18422 276322 0 0 3 0x14280 nfsidl nfsio 44417 256428 0 0 3 0x14280 nfsidl nfsio 68585 71463 0 0 3 0x14280 nfsidl nfsio 5709 197711 0 0 3 0x14280 nfsidl nfsio 77006 45600 0 0 3 0x14280 nfsidl nfsio 91964 254435 0 0 3 0x14280 nfsidl nfsio 59196 167784 0 0 3 0x14280 nfsidl nfsio 96012 258738 0 0 3 0x14280 nfsidl nfsio 91225 190436 0 0 3 0x14280 nfsidl nfsio 24494 98380 0 0 3 0x14280 nfsidl nfsio 18871 33420 0 0 3 0x14280 nfsidl nfsio 749 222846 0 0 3 0x14280 nfsidl nfsio 18890 269258 0 0 3 0x14280 nfsidl nfsio 43151 454824 96366 0 3 0x82 nanoslp syz-executor.3 52551 375469 0 0 3 0x14200 bored sosplice 28217 207973 96366 0 3 0x82 nanoslp syz-executor.5 62851 324642 96366 0 2 0x2 syz-executor.1 80046 47393 96366 0 3 0x82 nanoslp syz-executor.0 48902 159080 96366 0 3 0x82 nanoslp syz-executor.2 96366 26398 30885 0 3 0x82 wait syz-fuzzer 96366 315092 30885 0 3 0x4000082 thrsleep syz-fuzzer 96366 438852 30885 0 3 0x4000082 wait syz-fuzzer 96366 87669 30885 0 3 0x4000082 thrsleep syz-fuzzer 96366 269442 30885 0 3 0x4000082 wait syz-fuzzer 96366 92943 30885 0 3 0x4000082 thrsleep syz-fuzzer 96366 508527 30885 0 3 0x4000082 wait syz-fuzzer 96366 227654 30885 0 3 0x4000082 thrsleep syz-fuzzer 96366 9977 30885 0 3 0x4000082 thrsleep syz-fuzzer 96366 212650 30885 0 3 0x4000082 wait syz-fuzzer 96366 425621 30885 0 3 0x4000082 wait syz-fuzzer 96366 201808 30885 0 3 0x4000082 kqread syz-fuzzer 96366 1951 30885 0 3 0x4000082 wait syz-fuzzer 96366 36490 30885 0 3 0x4000082 wait syz-fuzzer 30885 376383 88536 0 3 0x10008a sigsusp ksh 88536 145912 18683 0 3 0x9a kqread sshd 78852 393944 1 0 3 0x100083 ttyin getty 18683 333171 1 0 3 0x88 kqread sshd 43178 71632 11372 73 3 0x1100090 kqread syslogd 11372 245977 1 0 3 0x100082 netio syslogd 56233 209921 1 0 3 0x100080 kqread resolvd 18178 444734 52420 77 3 0x100092 kqread dhcpleased 91116 151988 52420 77 3 0x100092 kqread dhcpleased 52420 316310 1 0 3 0x80 kqread dhcpleased 71137 470408 0 0 3 0x14200 bored smr 9170 99036 0 0 2 0x14200 zerothread 16446 488886 0 0 3 0x14200 aiodoned aiodoned 22337 514674 0 0 3 0x14200 syncer update 72011 307304 0 0 3 0x14200 cleaner cleaner 31735 253295 0 0 3 0x14200 reaper reaper 75783 439566 0 0 3 0x14200 pgdaemon pagedaemon 18968 75650 0 0 3 0x14200 bored viomb 14052 441339 0 0 3 0x40014200 acpi0 acpi0 59635 4089 0 0 3 0x14200 bored softnet 714 190746 0 0 3 0x14200 bored softnet 4620 331432 0 0 3 0x14200 bored softnet 26880 457320 0 0 3 0x14200 bored softnet 70651 312305 0 0 3 0x14200 bored systqmp 34104 509561 0 0 3 0x14200 bored systq 25146 507689 0 0 3 0x40014200 bored softclock 73322 437403 0 0 3 0x40014200 idle0 1 56469 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 10176 6404K 6662K 78643K 13804 0 pcb 14 14K 16K 78643K 1040 0 rtable 185 14K 16K 78643K 1324 0 ifaddr 91 19K 19K 78643K 1250 0 sysctl 2 0K 0K 78643K 2 0 counters 26 17K 17K 78643K 118 0 ioctlops 0 0K 4K 78643K 7224 0 iov 0 0K 12K 78643K 375 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1337 84K 84K 78643K 2192 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 17 0 VM map 2 0K 0K 78643K 2 0 sem 22 3K 4K 78643K 149 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 16 57K 73K 78643K 3804 0 sigio 0 0K 0K 78643K 30 0 proc 60 59K 75K 78643K 902 0 subproc 104 6K 6K 78643K 260 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 29 0 in_multi 73 5K 6K 78643K 320 0 ether_multi 1 0K 0K 78643K 4 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 91 413K 413K 78643K 91 0 exec 0 0K 2K 78643K 1190 0 pfkey data 0 0K 0K 78643K 3 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 299 283K 283K 78643K 21950 0 UVM aobj 28 2K 2K 78643K 37 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 55 0 NDP 12 0K 2K 78643K 88 0 temp 128 4718K 5742K 78643K 38044 0 kqueue 15 22K 30K 78643K 698 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 120 228 0 225 5 4 1 3 0 8 0 rtentry 112 337 0 270 4 0 4 4 0 8 0 unpcb 144 1350 0 1335 23 22 1 8 0 8 0 syncache 296 10 0 10 4 4 0 1 0 8 0 tcpqe 32 96 0 96 2 2 0 1 0 8 0 tcpcb 768 4274 0 4252 100 92 8 18 0 8 5 arp 88 42 0 34 1 0 1 1 0 8 0 ipq 40 3 0 3 1 1 0 1 0 8 0 ipqe 40 13 0 13 1 1 0 1 0 8 0 inpcb 336 6645 0 6624 75 68 7 13 0 8 5 nd6 48 101 0 86 1 0 1 1 0 8 0 pkpcb 40 7 0 7 2 2 0 1 0 8 0 kcovpl 48 20 0 12 1 0 1 1 0 8 0 ppxss 1160 73 0 73 1 1 0 1 0 8 0 pfstscr 40 77 0 76 1 0 1 1 0 8 0 pfosfp 40 1 0 0 1 0 1 1 0 8 0 pfosfpen 112 1 0 0 1 0 1 1 0 8 0 pfrktable 1344 92 0 79 5 3 2 2 0 8 0 pfanchor 1280 62 0 50 2 0 2 2 0 8 0 pftag 88 10 0 2 1 0 1 1 0 8 0 pfqueue 264 1 0 1 1 1 0 1 0 8 0 pfstitem 24 109 0 108 1 0 1 1 0 8 0 pfstkey 120 133 0 132 1 0 1 1 0 8 0 pfstate 336 68 0 67 1 0 1 1 0 8 0 pfrule 1360 2095 0 1652 38 1 37 37 0 8 0 art_heap8 4096 2 0 1 2 1 1 2 0 8 0 art_heap4 256 1556 0 1171 38 12 26 29 0 8 0 art_table 32 1558 0 1172 4 0 4 4 0 8 0 art_node 16 333 0 275 1 0 1 1 0 8 0 sysvmsgpl 40 47 0 14 2 1 1 1 0 8 0 semupl 112 3 0 3 1 1 0 1 0 8 0 semapl 112 135 0 115 1 0 1 1 0 8 0 shmpl 112 34 0 9 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 5674 0 4242 90 0 90 90 0 8 0 ffsino 240 5674 0 4242 85 0 85 85 0 8 0 nchpl 144 10981 0 9343 63 0 63 63 0 8 0 rtmask 32 3 0 3 1 1 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 37739 0 37738 3 2 1 2 0 8 0 vcpupl 2048 13 0 0 2 0 2 2 0 8 0 vmpool 536 13 0 0 1 0 1 1 0 8 0 pfiaddrpl 120 46 0 21 1 0 1 1 0 8 0 kstatmem 264 74 0 50 2 0 2 2 0 8 0 scxspl 216 32983 0 32983 9 8 1 8 0 8 1 plimitpl 152 171 0 157 1 0 1 1 0 8 0 sigapl 424 4092 0 4026 8 0 8 8 0 8 0 futexpl 64 39573 0 39567 1 0 1 1 0 8 0 knotepl 120 39497 0 39414 12 8 4 7 0 8 0 kqueuepl 184 1518 0 1506 11 10 1 4 0 8 0 pipepl 288 702 0 674 15 12 3 7 0 8 0 fdescpl 432 4054 0 4027 4 0 4 4 0 8 0 filepl 120 26813 0 26559 55 43 12 17 0 8 1 lockfpl 104 841 0 839 3 2 1 2 0 8 0 lockfspl 48 150 0 148 1 0 1 1 0 8 0 sessionpl 144 35 0 19 1 0 1 1 0 8 0 pgrppl 48 66 0 50 1 0 1 1 0 8 0 ucredpl 104 1462 0 1452 1 0 1 1 0 8 0 zombiepl 144 4027 0 4026 1 0 1 1 0 8 0 processpl 1000 4092 0 4026 10 1 9 9 0 8 0 procpl 672 9921 0 9829 18 10 8 9 0 8 0 sosppl 168 562 0 558 3 2 1 1 0 8 0 sockpl 456 8230 0 8191 182 170 12 42 0 8 7 mcl64k 65536 83 0 83 8 7 1 1 0 8 1 mcl16k 16384 30 0 30 10 9 1 1 0 8 1 mcl12k 12288 87 0 87 10 9 1 1 0 8 1 mcl9k 9216 31 0 31 11 11 0 1 0 8 0 mcl8k 8192 239 0 239 8 7 1 1 0 8 1 mcl4k 4096 379 0 379 4 3 1 1 0 8 1 mcl2k2 2112 93 0 93 11 10 1 1 0 8 1 mcl2k 2048 77959 0 77902 17 8 9 13 0 8 1 mtagpl 96 64 0 41 2 1 1 1 0 8 0 mbufpl 256 146727 0 146440 256 236 20 224 0 8 0 bufpl 288 8199 0 1798 458 0 458 458 0 8 0 anonpl 24 758313 0 741740 131 28 103 118 0 188 0 amapchunkpl 152 62543 0 61859 45 17 28 32 0 158 0 amappl16 200 11188 0 10620 68 37 31 41 0 8 0 amappl15 192 196 0 191 1 0 1 1 0 8 0 amappl14 184 38 0 34 1 0 1 1 0 8 0 amappl13 176 986 0 982 1 0 1 1 0 8 0 amappl12 168 641 0 635 1 0 1 1 0 8 0 amappl11 160 299 0 280 1 0 1 1 0 8 0 amappl10 152 870 0 861 1 0 1 1 0 8 0 amappl9 144 936 0 930 1 0 1 1 0 8 0 amappl8 136 1325 0 1251 3 0 3 3 0 8 0 amappl7 128 701 0 680 1 0 1 1 0 8 0 amappl6 120 711 0 699 2 1 1 2 0 8 0 amappl5 112 3914 0 3897 1 0 1 1 0 8 0 amappl4 104 1371 0 1344 2 1 1 2 0 8 0 amappl3 96 12052 0 11998 2 0 2 2 0 8 0 amappl2 88 1547 0 1512 2 0 2 2 0 8 0 amappl1 80 99797 0 99131 20 5 15 19 0 8 0 amappl 88 21250 0 21069 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 36 0 9 1 0 1 1 0 8 0 uaddrrnd 24 4067 0 4027 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 4067 0 4027 1 0 1 1 0 8 0 vmmpekpl 168 31462 0 31404 3 0 3 3 0 8 0 vmmpepl 168 394503 0 391899 195 73 122 137 0 357 3 vmsppl 272 4066 0 4027 5 2 3 3 0 8 0 rwobjpl 24 100767 0 93211 46 0 46 46 0 8 0 pdppl 4096 8140 0 8067 284 207 77 77 0 8 4 pvpl 32 1558503 0 1537554 331 155 176 253 0 265 4 pmappl 216 4066 0 4027 3 0 3 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 1405 0 577 29 4 25 29 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(ffff800000d3f680) at tcp_output+0x2a72 sys/netinet/tcp_output.c:727 tcp_send(fffffd80754f7038,fffffd80628de500,0,fffffd80628de000) at tcp_send+0xc4 sys/netinet/tcp_usrreq.c:944 sosend(fffffd80754f7038,0,ffff80002e8f5630,0,fffffd80628de000,0) at sosend+0x62a pru_send sys/sys/protosw.h:331 [inline] sosend(fffffd80754f7038,0,ffff80002e8f5630,0,fffffd80628de000,0) at sosend+0x62a sys/kern/uipc_socket.c:646 sendit(ffff8000216fdce0,7,ffff80002e8f57b0,0,ffff80002e8f58b0) at sendit+0x64d sys/kern/uipc_syscalls.c:694 sys_sendmsg(ffff8000216fdce0,ffff80002e8f5858,ffff80002e8f58b0) at sys_sendmsg+0x198 sys/kern/uipc_syscalls.c:601 syscall(ffff80002e8f5920) at syscall+0x447 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xbe3503bcdb0, 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(ffff800000d3f680) at tcp_output+0x2a72 sys/netinet/tcp_output.c:727 tcp_send(fffffd80754f7038,fffffd80628de500,0,fffffd80628de000) at tcp_send+0xc4 sys/netinet/tcp_usrreq.c:944 sosend(fffffd80754f7038,0,ffff80002e8f5630,0,fffffd80628de000,0) at sosend+0x62a pru_send sys/sys/protosw.h:331 [inline] sosend(fffffd80754f7038,0,ffff80002e8f5630,0,fffffd80628de000,0) at sosend+0x62a sys/kern/uipc_socket.c:646 sendit(ffff8000216fdce0,7,ffff80002e8f57b0,0,ffff80002e8f58b0) at sendit+0x64d sys/kern/uipc_syscalls.c:694 sys_sendmsg(ffff8000216fdce0,ffff80002e8f5858,ffff80002e8f58b0) at sys_sendmsg+0x198 sys/kern/uipc_syscalls.c:601 syscall(ffff80002e8f5920) at syscall+0x447 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xbe3503bcdb0, count: -9