login: panic: tcp_output: template len != hdrlen - optlen Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *333341 80752 0 0x12 0 0 sshd db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff821b9b34) at panic+0x15c sys/kern/subr_prf.c:207 tcp_output(ffff8000009e5320) at tcp_output+0x2ac0 tcp_setpersist sys/netinet/tcp_output.c:1130 [inline] tcp_output(ffff8000009e5320) at tcp_output+0x2ac0 sys/netinet/tcp_output.c:333 tcp_usrreq(fffffd805d8f5188,9,fffffd805c895800,0,0,ffff8000ffff4010) at tcp_usrreq+0xa54 sosend(fffffd805d8f5188,0,ffff80001d360b58,0,0,80) at sosend+0x669 sys/kern/uipc_socket.c:524 dofilewritev(ffff8000ffff4010,4,ffff80001d360b58,0,ffff80001d360c40) at dofilewritev+0x1ac sys/kern/sys_generic.c:364 sys_write(ffff8000ffff4010,ffff80001d360bf0,ffff80001d360c40) at sys_write+0x83 sys/kern/sys_generic.c:284 syscall(ffff80001d360cc0) at syscall+0x507 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffef450, 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 tcp_output: template len != hdrlen - optlen ddb> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff821b9b34) at panic+0x15c sys/kern/subr_prf.c:207 tcp_output(ffff8000009e5320) at tcp_output+0x2ac0 tcp_setpersist sys/netinet/tcp_output.c:1130 [inline] tcp_output(ffff8000009e5320) at tcp_output+0x2ac0 sys/netinet/tcp_output.c:333 tcp_usrreq(fffffd805d8f5188,9,fffffd805c895800,0,0,ffff8000ffff4010) at tcp_usrreq+0xa54 sosend(fffffd805d8f5188,0,ffff80001d360b58,0,0,80) at sosend+0x669 sys/kern/uipc_socket.c:524 dofilewritev(ffff8000ffff4010,4,ffff80001d360b58,0,ffff80001d360c40) at dofilewritev+0x1ac sys/kern/sys_generic.c:364 sys_write(ffff8000ffff4010,ffff80001d360bf0,ffff80001d360c40) at sys_write+0x83 sys/kern/sys_generic.c:284 syscall(ffff80001d360cc0) at syscall+0x507 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffef450, count: -9 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff80001d3606c0 rbx 0xffff80001d360770 rdx 0x2 rcx 0x1 rax 0x1 r8 0xffff80001d360680 r9 0x1 r10 0xe059a93d10f60ea4 r11 0x4d592239506e39ee r12 0x3000000008 r13 0xffff80001d3606d0 r14 0x100 r15 0x1 rip 0xffffffff81f1cb68 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80001d3606b0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (sshd) pid=333341 stat=onproc flags process=12 proc=0 pri=50, usrpri=50, nice=20 forw=0xffffffffffffffff, list=0xffff8000ffff4288,0xffffffff82565148 process=0xffff80001d3937f0 user=0xffff80001d35b000, vmspace=0xfffffd806bc12bb0 estcpu=2, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND *80752 333341 39386 0 7 0x12 sshd 82795 427414 1 0 3 0x100083 ttyin getty 39386 9935 1 0 3 0x80 select sshd 12958 131369 92641 73 3 0x100090 kqread syslogd 92641 165646 1 0 3 0x100082 netio syslogd 55420 118221 1 77 3 0x100090 poll dhclient 41046 98745 1 0 3 0x80 poll dhclient 94772 404166 0 0 2 0x14200 zerothread 58963 511834 0 0 3 0x14200 aiodoned aiodoned 33201 477716 0 0 3 0x14200 syncer update 12435 508931 0 0 3 0x14200 cleaner cleaner 27995 190056 0 0 3 0x14200 reaper reaper 56364 89615 0 0 3 0x14200 pgdaemon pagedaemon 30588 301934 0 0 3 0x14200 bored crynlk 90553 301687 0 0 3 0x14200 bored crypto 98229 222371 0 0 3 0x40014200 acpi0 acpi0 29796 3553 0 0 3 0x14200 bored softnet 35833 114400 0 0 3 0x14200 bored systqmp 9980 516762 0 0 3 0x14200 bored systq 8028 349213 0 0 3 0x40014200 bored softclock 894 357888 0 0 3 0x40014200 idle0 10541 42386 0 0 3 0x14200 bored smr 1 35244 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 9438 6318K 6320K 78643K 10539 0 pcb 13 8K 8K 78643K 13 0 rtable 63 1K 2K 78643K 161 0 ifaddr 24 7K 9K 78643K 33 0 counters 19 16K 16K 78643K 19 0 ioctlops 0 0K 2K 78643K 14 0 mount 1 1K 1K 78643K 1 0 vnodes 1180 74K 74K 78643K 1185 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 1K 78643K 2 0 VM map 2 0K 0K 78643K 2 0 sem 2 0K 0K 78643K 2 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1794 195K 288K 78643K 12646 0 file desc 1 0K 12K 78643K 18 0 proc 47 38K 54K 78643K 318 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 in_multi 11 0K 1K 78643K 22 0 ether_multi 1 0K 0K 78643K 1 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 18 79K 79K 78643K 18 0 exec 0 0K 1K 78643K 171 0 pagedep 1 8K 8K 78643K 1 0 inodedep 1 32K 32K 78643K 1 0 newblk 1 0K 0K 78643K 1 0 VM swap 7 26K 26K 78643K 7 0 UVM amap 55 2K 12K 78643K 862 0 UVM aobj 2 2K 2K 78643K 2 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 NDP 3 0K 0K 78643K 6 0 temp 21 3011K 3077K 78643K 3063 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 arp 64 4 0 2 1 0 1 1 0 8 0 rtpcb 80 17 0 15 1 0 1 1 0 8 0 rtentry 112 34 0 11 1 0 1 1 0 8 0 unpcb 120 27 0 19 1 0 1 1 0 8 0 syncache 264 5 0 5 1 0 1 1 0 8 1 tcpqe 32 6 0 6 1 1 0 1 0 8 0 tcpcb 544 8 0 5 1 0 1 1 0 8 0 inpcb 280 27 0 21 1 0 1 1 0 8 0 nd6 48 2 0 2 1 0 1 1 0 8 1 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 167 0 47 11 0 11 11 0 8 2 art_table 32 168 0 47 2 0 2 2 0 8 0 art_node 16 33 0 12 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 1415 0 24 46 0 46 46 0 8 1 ffsino 240 1415 0 24 83 0 83 83 0 8 0 nchpl 144 1643 0 55 60 0 60 60 0 8 0 uvmvnodes 72 1424 0 0 26 0 26 26 0 8 0 vnodes 208 1424 0 0 75 0 75 75 0 8 0 namei 1024 3878 0 3878 1 0 1 1 0 8 1 scxspl 192 4025 0 4025 1 0 1 1 0 8 1 plimitpl 152 14 0 10 1 0 1 1 0 8 0 sigapl 432 197 0 189 2 0 2 2 0 8 0 knotepl 112 39 0 34 1 0 1 1 0 8 0 kqueuepl 104 2 0 1 1 0 1 1 0 8 0 pipepl 128 134 0 132 1 0 1 1 0 8 0 fdescpl 424 198 0 189 2 0 2 2 0 8 0 filepl 120 1001 0 963 2 0 2 2 0 8 0 lockfpl 104 5 0 4 1 0 1 1 0 8 0 lockfspl 48 3 0 2 1 0 1 1 0 8 0 sessionpl 112 18 0 11 1 0 1 1 0 8 0 pgrppl 48 18 0 11 1 0 1 1 0 8 0 ucredpl 96 47 0 41 1 0 1 1 0 8 0 zombiepl 144 189 0 189 1 0 1 1 0 8 1 processpl 872 212 0 189 4 0 4 4 0 8 0 procpl 632 218 0 195 3 0 3 3 0 8 0 sockpl 384 71 0 55 2 0 2 2 0 8 0 mcl4k 4096 10 0 10 1 0 1 1 0 8 1 mcl2k 2048 5482 0 5448 8 3 5 8 0 8 0 mtagpl 80 2 0 2 1 1 0 1 0 8 0 mbufpl 256 9525 0 9483 9 2 7 7 0 8 3 bufpl 280 5846 0 1326 323 0 323 323 0 8 0 anonpl 16 20441 0 19353 14 1 13 13 0 107 6 amapchunkpl 152 722 0 689 5 0 5 5 0 158 3 amappl16 192 91 0 90 2 0 2 2 0 8 1 amappl15 184 50 0 46 1 0 1 1 0 8 0 amappl14 176 24 0 24 1 0 1 1 0 8 1 amappl12 160 11 0 11 1 0 1 1 0 8 1 amappl11 152 45 0 34 1 0 1 1 0 8 0 amappl10 144 8 0 8 1 0 1 1 0 8 1 amappl9 136 389 0 388 1 0 1 1 0 8 0 amappl8 128 86 0 82 1 0 1 1 0 8 0 amappl7 120 86 0 78 1 0 1 1 0 8 0 amappl6 112 60 0 58 1 0 1 1 0 8 0 amappl5 104 142 0 134 1 0 1 1 0 8 0 amappl4 96 429 0 403 1 0 1 1 0 8 0 amappl3 88 126 0 119 1 0 1 1 0 8 0 amappl2 80 848 0 798 3 0 3 3 0 8 1 amappl1 72 13744 0 13395 26 9 17 20 0 8 8 amappl 80 421 0 404 1 0 1 1 0 84 0 dma4096 4096 1 0 1 1 1 0 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 64 1 0 0 1 0 1 1 0 8 0 uaddrrnd 24 198 0 189 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 198 0 189 1 0 1 1 0 8 0 vmmpekpl 168 6067 0 6054 1 0 1 1 0 8 0 vmmpepl 168 29683 0 28981 82 4 78 78 0 357 43 vmsppl 272 197 0 189 1 0 1 1 0 8 0 pdppl 4096 402 0 378 5 0 5 5 0 8 0 pvpl 32 103833 0 101222 113 0 113 113 0 265 87 pmappl 200 197 0 189 1 0 1 1 0 8 0 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 126 0 7 4 0 4 4 0 8 0 ddb>