panic: malformed IPv4 option passed to ip_optcopy
Stopped at db_enter+0x18: addq $0x8,%rsp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
123635 75505 65534 0x10 0 0 syz-executor1
*226698 75505 65534 0x10 0x4000000 1K syz-executor1
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:399
panic() at panic+0x147 sys/kern/subr_prf.c:208
ip_fragment(1bf09d7bddaf0fc4,ffffff007bba98d9,ffff800000173290) at ip_fragment+0x625
ip_output(c19e57b3da0d05c2,ffffff006f3077a8,ffffff007bba9800,0,ffffff0072921600,ffffff006f308c00) at ip_output+0xc8d sys/netinet/ip_output.c:501
udp_output(d8afe98cb231a183,1400,ffffff006f308c00,0) at udp_output+0x45a sys/netinet/udp_usrreq.c:1004
sosend(86f0f0bbf9823549,ffffff0060e209e0,ffff800021173aa0,ffff800021173b50,1000,0) at sosend+0x477 sys/kern/uipc_socket.c:513
dofilewritev(e5e9c263a844d4d1,ffff800021063c38,ffff800021173b50,1000,ffff800021173b68) at dofilewritev+0x148 sys/kern/sys_generic.c:364
sys_write(9058e0c4b8085251,40,ffff800021063c38) at sys_write+0x7b sys/kern/sys_generic.c:283
syscall(9c5728472fd5ca24) at syscall+0x473 mi_syscall sys/sys/syscall_mi.h:99 [inline]
syscall(9c5728472fd5ca24) at syscall+0x473 sys/arch/amd64/amd64/trap.c:583
Xsyscall(6,0,c,0,3,84fb3fa0010) at Xsyscall+0x128
end of kernel
end trace frame: 0x851dd524e60, 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 sys/arch/amd64/amd64/db_interface.c:399
panic() at panic+0x147 sys/kern/subr_prf.c:208
ip_fragment(1bf09d7bddaf0fc4,ffffff007bba98d9,ffff800000173290) at ip_fragment+0x625
ip_output(c19e57b3da0d05c2,ffffff006f3077a8,ffffff007bba9800,0,ffffff0072921600,ffffff006f308c00) at ip_output+0xc8d sys/netinet/ip_output.c:501
udp_output(d8afe98cb231a183,1400,ffffff006f308c00,0) at udp_output+0x45a sys/netinet/udp_usrreq.c:1004
sosend(86f0f0bbf9823549,ffffff0060e209e0,ffff800021173aa0,ffff800021173b50,1000,0) at sosend+0x477 sys/kern/uipc_socket.c:513
dofilewritev(e5e9c263a844d4d1,ffff800021063c38,ffff800021173b50,1000,ffff800021173b68) at dofilewritev+0x148 sys/kern/sys_generic.c:364
sys_write(9058e0c4b8085251,40,ffff800021063c38) at sys_write+0x7b sys/kern/sys_generic.c:283
syscall(9c5728472fd5ca24) at syscall+0x473 mi_syscall sys/sys/syscall_mi.h:99 [inline]
syscall(9c5728472fd5ca24) at syscall+0x473 sys/arch/amd64/amd64/trap.c:583
Xsyscall(6,0,c,0,3,84fb3fa0010) at Xsyscall+0x128
end of kernel
end trace frame: 0x851dd524e60, count: -10
ddb{1}> show registers
rdi 0xffffffff81ee5310 kprintf_mutex
rsi 0xffffffff810e80d7 db_enter+0x17
rbp 0xffff8000211736d0
rbx 0xffff800021173770
rdx 0xffff8000042e1000
rcx 0x1128 __ALIGN_SIZE+0x128
rax 0xffff8000042e1000
r8 0xffff8000211736a0
r9 0
r10 0xf009ccde4b4313aa
r11 0xac71b710d7b62e02
r12 0x3000000008
r13 0xffff8000211736e0
r14 0x100
r15 0xffffffff81c5f925 apollo_udma100_tim+0x10a1d
rip 0xffffffff810e80d8 db_enter+0x18
cs 0x8
rflags 0x246
rsp 0xffff8000211736c0
ss 0x10
db_enter+0x18: addq $0x8,%rsp
ddb{1}> show proc
PROC (syz-executor1) pid=226698 stat=onproc
flags process=10<SUGID> proc=4000000<THREAD>
pri=82, usrpri=82, nice=20
forw=0xffffffffffffffff, list=0xffff800021063080,0xffffffff81faceb8
process=0xffff800021065708 user=0xffff80002116e000, vmspace=0xffffff0065929008
estcpu=36, cpticks=0, pctcpu=0.0
user=0, sys=0, intr=0
ddb{1}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
75505 123635 9638 65534 7 0x10 syz-executor1
*75505 226698 9638 65534 7 0x4000010 syz-executor1
58604 265974 65271 65534 3 0x90 nanosleep syz-executor0
65271 415458 34279 0 3 0x82 wait syz-executor0
9638 47581 74813 65534 3 0x90 nanosleep syz-executor1
74813 402669 34279 0 3 0x82 wait syz-executor1
22653 411489 0 0 3 0x14200 bored sosplice
34279 45717 15189 0 3 0x82 thrsleep syz-fuzzer
34279 203960 15189 0 3 0x4000082 nanosleep syz-fuzzer
34279 156358 15189 0 3 0x4000082 thrsleep syz-fuzzer
34279 66392 15189 0 3 0x4000082 kqread syz-fuzzer
34279 108689 15189 0 3 0x4000082 thrsleep syz-fuzzer
34279 322386 15189 0 3 0x4000082 thrsleep syz-fuzzer
34279 110487 15189 0 3 0x4000082 thrsleep syz-fuzzer
34279 149887 15189 0 3 0x4000082 nanosleep syz-fuzzer
34279 249301 15189 0 3 0x4000082 thrsleep syz-fuzzer
34279 248173 15189 0 3 0x4000082 thrsleep syz-fuzzer
15189 66236 5757 0 3 0x10008a pause ksh
5757 199756 25597 0 3 0x92 select sshd
84718 61443 1 0 3 0x100083 ttyin getty
25597 132968 1 0 3 0x80 select sshd
34304 312781 57208 73 3 0x100090 kqread syslogd
57208 444004 1 0 3 0x100082 netio syslogd
86330 80200 1 77 3 0x100090 poll dhclient
4973 212195 1 0 3 0x80 poll dhclient
66081 231968 0 0 3 0x14200 pgzero zerothread
36978 247489 0 0 3 0x14200 aiodoned aiodoned
33685 397606 0 0 3 0x14200 syncer update
82776 364826 0 0 3 0x14200 cleaner cleaner
51927 322886 0 0 3 0x14200 reaper reaper
30957 241733 0 0 3 0x14200 pgdaemon pagedaemon
90721 421712 0 0 3 0x14200 bored crynlk
25512 112588 0 0 3 0x14200 bored crypto
6164 479840 0 0 3 0x40014200 acpi0 acpi0
5340 150822 0 0 3 0x40014200 idle1
19922 143071 0 0 3 0x14200 bored softnet
10766 370305 0 0 3 0x14200 bored systqmp
71759 17003 0 0 3 0x14200 bored systq
69960 122144 0 0 3 0x40014200 bored softclock
87861 504135 0 0 3 0x40014200 idle0
1 28346 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper