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
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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<EXEC> proc=4000000<THREAD>
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}>