panic: malformed IPv4 option passed to ip_optcopy Stopped at db_enter+0xa: popq %rbp TID PID UID PRFLAGS PFLAGS CPU COMMAND 240244 90692 0 0x2 0 1 syz-executor7182 *221300 90692 0 0x2 0x4000000 0K syz-executor7182 db_enter() at db_enter+0xa sys/arch/amd64/amd64/db_interface.c:399 panic() at panic+0x147 sys/kern/subr_prf.c:208 ip_fragment(ffffff0005fe9000,ffff800000173290,ffffff006efd9700) at ip_fragment+0x5f4 ip_output(ffffff006f2d9000,ffffff006efd9700,ffffff0005fe9000,22,1000,e03a3044e0550017) at ip_output+0xc6c sys/netinet/ip_output.c:501 rip_output(0,9,ffffff006e6fd908,0) at rip_output+0x187 sys/netinet/raw_ip.c:293 rip_usrreq(1000,ffffff006e6fd908,0,ffffff006efd9700,0,e03a3044e0550017) at rip_usrreq+0x3ed sys/netinet/raw_ip.c:472 sosend(ffffff006e48d620,ffff800021119318,1000,ffff8000211193c0,0,e03a3044e0550017) at sosend+0x46a sys/kern/uipc_socket.c:513 dofilewritev(ffff8000210a4970,ffff8000211193c0,1000,ffff8000211193d8,62a2c369ff8) at dofilewritev+0x13e sys/kern/sys_generic.c:364 sys_write(40,ffff8000210a4970,0) at sys_write+0x6e sys/kern/sys_generic.c:283 syscall(0) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(0) at syscall+0x489 sys/arch/amd64/amd64/trap.c:583 Xsyscall(6,0,62a817bd4a0,0,62798b4a098,62798b4a090) at Xsyscall+0x128 end of kernel end trace frame: 0x62a2c36a020, count: 4 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{0}> ddb{0}> set $lines = 0 ddb{0}> show panic malformed IPv4 option passed to ip_optcopy ddb{0}> trace db_enter() at db_enter+0xa sys/arch/amd64/amd64/db_interface.c:399 panic() at panic+0x147 sys/kern/subr_prf.c:208 ip_fragment(ffffff0005fe9000,ffff800000173290,ffffff006efd9700) at ip_fragment+0x5f4 ip_output(ffffff006f2d9000,ffffff006efd9700,ffffff0005fe9000,22,1000,e03a3044e0550017) at ip_output+0xc6c sys/netinet/ip_output.c:501 rip_output(0,9,ffffff006e6fd908,0) at rip_output+0x187 sys/netinet/raw_ip.c:293 rip_usrreq(1000,ffffff006e6fd908,0,ffffff006efd9700,0,e03a3044e0550017) at rip_usrreq+0x3ed sys/netinet/raw_ip.c:472 sosend(ffffff006e48d620,ffff800021119318,1000,ffff8000211193c0,0,e03a3044e0550017) at sosend+0x46a sys/kern/uipc_socket.c:513 dofilewritev(ffff8000210a4970,ffff8000211193c0,1000,ffff8000211193d8,62a2c369ff8) at dofilewritev+0x13e sys/kern/sys_generic.c:364 sys_write(40,ffff8000210a4970,0) at sys_write+0x6e sys/kern/sys_generic.c:283 syscall(0) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(0) at syscall+0x489 sys/arch/amd64/amd64/trap.c:583 Xsyscall(6,0,62a817bd4a0,0,62798b4a098,62798b4a090) at Xsyscall+0x128 end of kernel end trace frame: 0x62a2c36a020, count: -11 ddb{0}> show registers rdi 0xffffffff81e20110 kprintf_mutex rsi 0x5 rbp 0xffff800021118f50 rbx 0xffff800021118ff0 rdx 0x3fd rcx 0 rax 0x1 r8 0xffff800021118f20 r9 0 r10 0 r11 0xffffffff8197d380 x86_bus_space_io_read_1 r12 0x3000000008 r13 0xffff800021118f60 r14 0x100 r15 0xffffffff81c38636 apollo_udma100_tim+0xd631 rip 0xffffffff8182d81a db_enter+0xa cs 0x8 rflags 0x202 rsp 0xffff800021118f50 ss 0x10 db_enter+0xa: popq %rbp ddb{0}> show proc PROC (syz-executor7182) pid=221300 stat=onproc flags process=2 proc=4000000 pri=51, usrpri=51, nice=20 forw=0xffffffffffffffff, list=0xffff8000210a4718,0xffffffff81ebabf8 process=0xffff8000210a7300 user=0xffff800021114000, vmspace=0xffffff007f124210 estcpu=1, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 90692 240244 75369 0 7 0x2 syz-executor7182 *90692 221300 75369 0 7 0x4000002 syz-executor7182 75369 163534 14015 0 3 0x10008a pause ksh 14015 59605 46217 0 3 0x92 select sshd 60858 311911 1 0 3 0x100083 ttyin getty 46217 482486 1 0 3 0x80 select sshd 51974 59267 85278 73 3 0x100090 kqread syslogd 85278 79216 1 0 3 0x100082 netio syslogd 93235 129952 1 77 3 0x100090 poll dhclient 90893 45340 1 0 3 0x80 poll dhclient 3626 353315 0 0 2 0x14200 zerothread 99632 49372 0 0 3 0x14200 aiodoned aiodoned 70051 189025 0 0 3 0x14200 syncer update 94447 403790 0 0 3 0x14200 cleaner cleaner 16158 308297 0 0 3 0x14200 reaper reaper 22042 3036 0 0 3 0x14200 pgdaemon pagedaemon 57722 253800 0 0 3 0x14200 bored crynlk 41276 504436 0 0 3 0x14200 bored crypto 41465 240531 0 0 3 0x40014200 acpi0 acpi0 92137 104984 0 0 3 0x40014200 idle1 78872 449395 0 0 3 0x14200 bored softnet 21325 166296 0 0 3 0x14200 bored systqmp 89258 51153 0 0 3 0x14200 bored systq 72343 398068 0 0 3 0x40014200 bored softclock 53696 477841 0 0 3 0x40014200 idle0 1 283596 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}>