Warning: Permanently added '10.128.0.163' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program panic: malformed IPv4 option passed to ip_optcopy Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 198720 94493 0 0 0 0 syz-executor5461 *149272 94493 0 0 0x4000000 1K syz-executor5461 db_enter() at db_enter+0x18 panic() at panic+0x147 ip_fragment(cf5c07fbf8856990,ffffff007f1433d9,ffff800000173290) at ip_fragment+ 0x625 ip_output(17d5a39689666dd0,ffffff006f307460,ffffff007f143300,0,ffffff006f016800 ,ffffff006f308c00) at ip_output+0xc8d udp_output(cf5c07fbf81f54fa,1400,ffffff006f308c00,0) at udp_output+0x45a sosend(58a7126b623f4bbc,ffffff006e4af260,ffff8000210e72c8,ffff8000210e7400,1000 ,0) at sosend+0x477 dofilewritev(c5a2f71672af20b5,0,3,ffff8000210b4bc8,ffff8000210e7400) at dofilew ritev+0x148 sys_writev(fbe5352a4b0548a4,790,ffff8000210b4bc8) at sys_writev+0xdb syscall(2d7fac4b52467d04) at syscall+0x473 Xsyscall(6,0,10aec53c4a0,0,1083f18e108,1083f18e100) at Xsyscall+0x128 end of kernel end trace frame: 0x10afe8803d0, count: 5 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{1}> ddb{1}> set $lines = 0 ddb{1}> show panic malformed IPv4 option passed to ip_optcopy ddb{1}> trace db_enter() at db_enter+0x18 panic() at panic+0x147 ip_fragment(cf5c07fbf8856990,ffffff007f1433d9,ffff800000173290) at ip_fragment+0x625 ip_output(17d5a39689666dd0,ffffff006f307460,ffffff007f143300,0,ffffff006f016800,ffffff006f308c00) at ip_output+0xc8d udp_output(cf5c07fbf81f54fa,1400,ffffff006f308c00,0) at udp_output+0x45a sosend(58a7126b623f4bbc,ffffff006e4af260,ffff8000210e72c8,ffff8000210e7400,1000,0) at sosend+0x477 dofilewritev(c5a2f71672af20b5,0,3,ffff8000210b4bc8,ffff8000210e7400) at dofilewritev+0x148 sys_writev(fbe5352a4b0548a4,790,ffff8000210b4bc8) at sys_writev+0xdb syscall(2d7fac4b52467d04) at syscall+0x473 Xsyscall(6,0,10aec53c4a0,0,1083f18e108,1083f18e100) at Xsyscall+0x128 end of kernel end trace frame: 0x10afe8803d0, count: -10 ddb{1}> show registers rdi 0xffffffff81edbb38 kprintf_mutex rsi 0x5 rbp 0xffff8000210e6ef0 rbx 0xffff8000210e6f90 rdx 0x3fd rcx 0 rax 0x1 r8 0xffff8000210e6ec0 r9 0 r10 0x8989983e3d4cbb6c r11 0x1ecd66cd6e111d7c r12 0x3000000008 r13 0xffff8000210e6f00 r14 0x100 r15 0xffffffff81c5e947 substchar+0x10fc3 rip 0xffffffff811bca38 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff8000210e6ee0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor5461) pid=149272 stat=onproc flags process=0 proc=4000000 pri=51, usrpri=51, nice=20 forw=0xffffffffffffffff, list=0xffff8000210b4e20,0xffffffff81f734e0 process=0xffff80002109a018 user=0xffff8000210e2000, vmspace=0xffffff007f123528 estcpu=1, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 94493 198720 43260 0 7 0 syz-executor5461 94493 162239 43260 0 3 0x4000080 fsleep syz-executor5461 94493 394784 43260 0 3 0x4000080 fsleep syz-executor5461 *94493 149272 43260 0 7 0x4000000 syz-executor5461 43260 274301 75395 0 3 0x82 nanosleep syz-executor5461 75395 450220 64241 0 3 0x10008a pause ksh 64241 303646 48657 0 3 0x92 select sshd 79547 114943 1 0 3 0x100083 ttyin getty 48657 227558 1 0 3 0x80 select sshd 96995 62829 52889 73 3 0x100090 kqread syslogd 52889 195501 1 0 3 0x100082 netio syslogd 54315 463431 1 77 3 0x100090 poll dhclient 73361 215428 1 0 3 0x80 poll dhclient 86678 514671 0 0 3 0x14200 pgzero zerothread 42358 218261 0 0 3 0x14200 aiodoned aiodoned 49820 313607 0 0 3 0x14200 syncer update 37386 150931 0 0 3 0x14200 cleaner cleaner 99507 369069 0 0 3 0x14200 reaper reaper 71626 455578 0 0 3 0x14200 pgdaemon pagedaemon 5952 290225 0 0 3 0x14200 bored crynlk 45274 204849 0 0 3 0x14200 bored crypto 64538 202509 0 0 3 0x40014200 acpi0 acpi0 65675 191149 0 0 3 0x40014200 idle1 54482 144785 0 0 3 0x14200 bored softnet 35473 495950 0 0 3 0x14200 bored systqmp 50658 228535 0 0 3 0x14200 bored systq 16489 118424 0 0 3 0x40014200 bored softclock 47302 104405 0 0 3 0x40014200 idle0 1 106821 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}>