protection_fault: rtable_match

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Aug 13, 2026, 12:27:29 AM (5 days ago) Aug 13
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Hello,

syzbot found the following issue on:

HEAD commit: a63ea9f8f0de relayd: check imsg_compose_event return values
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=13f4f479580000
kernel config: https://syzkaller.appspot.com/x/.config?x=1bc15e68cd2a49e5
dashboard link: https://syzkaller.appspot.com/bug?extid=e0a469273c54c8d6914a

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/57958ba56e2e/disk-a63ea9f8.raw.xz
bsd.gdb: https://storage.googleapis.com/syzbot-assets/7f107ce0d70c/bsd-a63ea9f8.gdb.xz
kernel image: https://storage.googleapis.com/syzbot-assets/85f02cf70c09/kernel-a63ea9f8.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+e0a469...@syzkaller.appspotmail.com

kernel: protection fault trap, code=0
Stopped at rtable_match+0xd8: movl 0x28(%r15),%r14d
ddb>
ddb> set $lines = 0
ddb> set $maxwidth = 0
ddb> show panic
the kernel did not panic
ddb> show kasan
No such command
ddb> trace
rtable_match(18,ffff800001621860,0) at rtable_match+0xd8 satoaddr sys/net/rtable.c:917 [inline]
rtable_match(18,ffff800001621860,0) at rtable_match+0xd8 sys/net/rtable.c:496
rtm_output(ffff800001621800,ffff80003c9198c8,ffff80003c919820,3f,18) at rtm_output+0x18e sys/net/rtsock.c:924
route_output(ffffef806e0e4500,ffff80000166c8d0) at route_output+0xa6a sys/net/rtsock.c:862
route_send(ffff80000166c8d0,ffffef806e0e4500,0,0) at route_send+0xd7 sys/net/rtsock.c:322
sosend(ffff80000166c8d0,0,ffff80003c919a78,0,0,408) at sosend+0x804 sys/kern/uipc_socket.c:-1
sendit(ffff80002a75b4d8,4,ffff80003c919b70,408,ffff80003c919c10) at sendit+0x5a5 sys/kern/uipc_syscalls.c:785
sys_sendto(ffff80002a75b4d8,ffff80003c919cc0,ffff80003c919c10) at sys_sendto+0x8d sys/kern/uipc_syscalls.c:563
syscall(ffff80003c919cc0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline]
syscall(ffff80003c919cc0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x2c11920c0d0, count: -9
ddb> show registers
rdi 0x798e263a
rsi 0x18
rbp 0xffff80003c919770
rbx 0
rdx 0xffff8000015e7200
rcx 0x18
rax 0xffff80000161de00
r8 0x18
r9 0x408
r10 0xe91874e6487d711c
r11 0xf7034df980967a4a
r12 0xffff800001621860
r13 0x798e263a
r14 0x18
r15 0x300000000000016
rip 0xffffffff81bf4808 rtable_match+0xd8
cs 0x8
rflags 0x10202 __ALIGN_SIZE+0xf202
rsp 0xffff80003c919710
ss 0x10
rtable_match+0xd8: movl 0x28(%r15),%r14d
ddb> show proc
PROC (syz-executor) tid=59013 pid=45851 tcnt=2 stat=onproc
flags process=0 proc=4000000<THREAD>
runpri=32, usrpri=50, slppri=32, nice=20
wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0
forw=0xffffffffffffffff, list=0xffff80002a75a2b0,0xffffffff83a85a60
process=0xffff800045ff9b18 user=0xffff80003c914000, vmspace=0xffffef806dae0188
estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0
ddb> ps
PID TID PPID UID S PRLAGS PFLAGS WAIT COMMAND
45851 122505 10475 0 2 0 0 syz-executor
*45851 59013 10475 0 7 0 0x4000000 syz-executor
25348 413607 82211 0 2 0 0 syz-executor
25348 515177 82211 0 3 0 0x4000080 fsleep syz-executor
25348 515421 82211 0 3 0 0x4000080 fsleep syz-executor
59644 488514 48172 0 2 0 0 syz-executor
59644 124162 48172 0 3 0 0x4000080 fsleep syz-executor
2974 53006 30634 0 2 0 0 syz-executor
2974 221474 30634 0 3 0 0x4000080 nanoslp syz-executor
56062 260759 30467 0 2 0 0 syz-executor
56062 324182 30467 0 3 0 0x4000080 fsleep syz-executor
54080 87369 72372 0 2 0 0 syz-executor
54080 135568 72372 0 3 0 0x4000080 bell syz-executor
54080 60871 72372 0 2 0 0x4000000 syz-executor
31214 383309 16200 0 2 0 0 syz-executor
31214 117030 16200 0 3 0 0x4000080 fsleep syz-executor
37951 334696 1 0 3 0x100003 0x80 ttyin getty
16200 36452 13051 0 3 0x2 0x80 nanoslp syz-executor
57995 129565 0 0 3 0x14000 0x200 acct acct
72372 56657 13051 0 3 0x2 0x80 nanoslp syz-executor
48172 428662 13051 0 3 0x2 0x80 nanoslp syz-executor
40615 502049 13051 0 3 0x2 0x80 nanoslp syz-executor
30467 42855 13051 0 3 0x2 0x80 nanoslp syz-executor
10475 71068 13051 0 3 0x2 0x80 nanoslp syz-executor
82211 520459 13051 0 3 0x2 0x80 nanoslp syz-executor
30634 53206 13051 0 3 0x2 0x80 nanoslp syz-executor
13051 295631 12836 0 3 0x2 0x80 kqread syz-executor
12836 441951 34683 0 3 0x100002 0x88 sigsusp ksh
34683 490761 81424 0 3 0x10 0x88 kqread sshd-session
81424 386338 42682 0 3 0x12 0x80 kqread sshd-session
42682 72297 1 0 3 0 0x88 kqread sshd
72125 412049 99803 73 3 0x1100010 0x80 kqread syslogd
99803 130371 1 0 3 0x100002 0x80 sbwait syslogd
65041 427929 1 0 3 0x100000 0x80 kqread resolvd
96953 63835 51599 77 3 0x100012 0x80 kqread dhcpleased
79993 519198 51599 77 3 0x100012 0x80 kqread dhcpleased
51599 201373 1 0 3 0 0x80 kqread dhcpleased
94550 446973 0 0 3 0x14000 0x200 bored smr
13246 231933 0 0 2 0x14000 0x200 zerothread
74813 393848 0 0 3 0x14000 0x200 aiodoned aiodoned
43086 170648 0 0 3 0x14000 0x200 syncer update
59579 108041 0 0 3 0x14000 0x200 cleaner cleaner
3562 44119 0 0 3 0x14000 0x200 reaper reaper
29895 319904 0 0 3 0x14000 0x200 pgdaemon pagedaemon
27382 351948 0 0 3 0x14000 0x200 bored viomb
85179 193296 0 0 3 0x14000 0x40000200 acpi0 acpi0
1489 492281 0 0 3 0x14000 0x200 bored softnet0
68217 514390 0 0 3 0x14000 0x200 bored systqmp
12740 98212 0 0 3 0x14000 0x200 bored systq
90414 309328 0 0 3 0x14000 0x40000200 tmoslp softclock
28205 351891 0 0 3 0x14000 0x40000200 idle0
1 387994 0 0 3 0x2 0x80 wait init
0 0 -1 0 3 0x10000 0x200 scheduler swapper
ddb> show all locks
No such command
ddb> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 11092 12242K 12574K 166960K 13109 0
pcb 17 12K 12K 166960K 80 0
rtable 238 8K 9K 166960K 457 0
pf 34 13K 20K 166960K 88 0
ifaddr 40 6K 8K 166960K 62 0
ifgroup 54 2K 2K 166960K 88 0
sysctl 4 1K 9K 166960K 10 0
counters 34 17K 18K 166960K 49 0
ioctlops 0 0K 4K 166960K 86 0
iov 0 0K 16K 166960K 16 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1328 84K 84K 166960K 1792 0
UFS quota 1 32K 32K 166960K 1 0
UFS mount 5 36K 36K 166960K 5 0
shm 2 1K 5K 166960K 10 0
VM map 2 1K 1K 166960K 2 0
sem 12 0K 0K 166960K 23 0
dirhash 12 2K 2K 166960K 15 0
ACPI 1734 201K 291K 166960K 11964 0
file desc 18 65K 93K 166960K 435 0
sigio 0 0K 0K 166960K 2 0
proc 64 67K 100K 166960K 572 0
subproc 72 4K 4K 166960K 81 0
NFS srvsock 1 0K 0K 166960K 1 0
NFS daemon 1 16K 16K 166960K 1 0
ip_moptions 0 0K 0K 166960K 33 0
in_multi 88 5K 6K 166960K 125 0
ether_multi 1 0K 0K 166960K 2 0
mrt 2 0K 0K 166960K 15 0
ISOFS mount 1 32K 32K 166960K 1 0
MSDOSFS mount 1 16K 16K 166960K 1 0
ttys 325 1447K 1447K 166960K 325 0
exec 0 0K 1K 166960K 398 0
fusefs mount 1 32K 32K 166960K 1 0
tdb 3 0K 0K 166960K 3 0
VM swap 8 62K 64K 166960K 10 0
UVM amap 226 168K 168K 166960K 5328 0
UVM aobj 80 5K 5K 166960K 83 0
pinsyscall 39 78K 97K 166960K 1569 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
ip6_options 0 0K 0K 166960K 22 0
NDP 12 0K 2K 166960K 39 0
temp 40 9107K 9171K 166960K 7036 0
kqueue 14 22K 31K 166960K 96 0
SYN cache 2 16K 16K 166960K 2 0
ddb> show all pools
Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
rtpcb 120 166 0 162 3 2 1 3 0 8 0
rtentry 136 130 0 28 4 0 4 4 0 8 0
unpcb 144 174 0 158 1 0 1 1 0 8 0
syncache 336 6 0 6 2 1 1 1 0 8 1
tcpcb 736 132 0 128 4 3 1 4 0 8 0
arp 96 22 0 4 1 0 1 1 0 8 0
ipq 40 2 0 0 1 0 1 1 0 8 0
ipqe 40 3 0 1 1 0 1 1 0 8 0
inpcb 328 336 0 325 5 3 2 4 0 8 1
nd6 112 28 0 6 1 0 1 1 0 8 0
kcovpl 48 9 0 1 1 0 1 1 0 8 0
ppxss 1072 9 0 9 2 1 1 1 0 8 1
pppxif 1416 3 0 3 1 1 0 1 0 8 0
pfstscr 40 4 0 2 1 0 1 1 0 8 0
pfrktable 1344 7 0 7 1 0 1 1 0 8 1
pfanchor 1288 4 0 2 2 1 1 1 0 8 0
pftag 88 2 0 0 1 0 1 1 0 8 0
pfqueue 320 1 0 1 1 1 0 1 0 8 0
pfstitem 24 2 0 0 1 0 1 1 0 8 0
pfstkey 128 4 0 2 1 0 1 1 0 8 0
pfstate 384 2 0 1 1 0 1 1 0 8 0
pfrule 1360 5 0 5 1 0 1 1 0 8 1
rttmr 136 2 0 2 2 1 1 1 0 8 1
art_heap8 4096 2 0 0 2 0 2 2 0 8 0
art_heap4 256 520 0 100 30 3 27 29 0 8 0
art_table 40 522 0 100 5 0 5 5 0 8 0
art_node 32 130 0 38 1 0 1 1 0 8 0
sysvmsgpl 40 8 0 5 1 0 1 1 0 8 0
semupl 112 1 0 1 1 0 1 1 0 8 1
semapl 72 20 0 10 1 0 1 1 0 8 0
shmpl 112 80 0 3 3 0 3 3 0 8 0
dirhash 1024 19 0 2 3 0 3 3 0 8 0
dino2pl 256 2141 0 679 92 0 92 92 0 8 0
ffsino 256 2141 0 679 92 0 92 92 0 8 0
nchpl 144 2761 0 1059 64 0 64 64 0 8 0
rtmask 32 2 0 2 1 1 0 1 0 8 0
vnodes 216 2493 0 0 139 0 139 139 0 8 0
namei 1024 9028 0 9028 3 2 1 2 0 8 1
pfiaddrpl 120 3 0 3 1 1 0 1 0 8 0
kstatmem 264 43 0 18 2 0 2 2 0 8 0
scsiplug 72 1 0 1 1 0 1 1 0 8 1
scxspl 216 12913 0 12913 4 3 1 4 1 8 1
plimitpl 152 155 0 138 1 0 1 1 0 8 0
sigapl 424 731 0 687 6 0 6 6 0 8 0
knotepl 120 13695 0 13597 17 7 10 15 0 8 7
kqueuepl 184 231 0 219 5 2 3 3 0 8 2
pipepl 304 249 0 222 8 5 3 8 0 8 0
fdescpl 448 717 0 687 5 1 4 5 0 8 0
filepl 120 4134 0 3911 16 7 9 15 0 8 1
lockfpl 104 125 0 122 1 0 1 1 0 8 0
lockfspl 48 57 0 54 1 0 1 1 0 8 0
sessionpl 144 99 0 91 1 0 1 1 0 8 0
pgrppl 48 109 0 93 1 0 1 1 0 8 0
ucredpl 104 799 0 787 1 0 1 1 0 8 0
zombiepl 144 688 0 687 1 0 1 1 0 8 0
processpl 1152 731 0 687 4 0 4 4 0 8 0
procpl 664 1137 0 1084 5 0 5 5 0 8 0
sockpl 552 691 0 660 8 4 4 7 0 8 1
mcl64k 65536 46 0 46 2 1 1 1 0 8 1
mcl16k 16384 4 0 4 1 1 0 1 0 8 0
mcl8k 8192 7 0 7 1 1 0 1 0 8 0
mcl4k 4096 2923 0 2870 14 6 8 13 0 8 0
mcl2k 2048 405 0 403 2 0 2 2 0 8 1
mextrefs 64 183 0 182 1 0 1 1 0 8 0
mtagpl 96 5 0 4 1 0 1 1 0 8 0
mbufpl 256 7254 0 7103 18 4 14 16 0 8 1
bufpl 272 4947 0 103 323 0 323 323 0 8 0
anonpl 24 133346 0 128561 61 0 61 61 0 187 12
amapchunkpl 152 16621 0 16036 27 1 26 26 0 158 3
amappl16 200 2712 0 2689 23 7 16 23 0 8 8
amappl15 192 5 0 5 1 1 0 1 0 8 0
amappl14 184 459 0 458 1 0 1 1 0 8 0
amappl13 176 122 0 111 1 0 1 1 0 8 0
amappl12 168 966 0 936 2 0 2 2 0 8 0
amappl11 160 8 0 8 1 1 0 1 0 8 0
amappl10 152 90 0 80 1 0 1 1 0 8 0
amappl9 144 273 0 273 1 1 0 1 0 8 0
amappl8 136 113 0 112 1 0 1 1 0 8 0
amappl7 128 148 0 135 1 0 1 1 0 8 0
amappl6 120 159 0 157 1 0 1 1 0 8 0
amappl5 112 91 0 83 1 0 1 1 0 8 0
amappl4 104 268 0 250 1 0 1 1 0 8 0
amappl3 96 3012 0 2918 3 0 3 3 0 8 0
amappl2 88 842 0 770 2 0 2 2 0 8 0
amappl1 80 11410 0 10854 14 2 12 14 0 8 0
amappl 88 4570 0 4408 5 0 5 5 0 92 0
uvmvnodes 80 101 0 0 3 0 3 3 0 8 0
dma16384 16384 1 0 1 1 1 0 1 0 8 0
dma4096 4096 1 0 1 1 1 0 1 0 8 0
dma1024 1024 2 0 1 1 0 1 1 0 8 0
dma256 256 8 0 8 2 1 1 1 0 8 1
dma128 128 254 0 254 2 1 1 1 0 8 1
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 19 0 18 1 0 1 1 0 8 0
aobjpl 72 82 0 3 2 0 2 2 0 8 0
uaddrrnd 24 717 0 687 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 717 0 687 1 0 1 1 0 8 0
vmmpekpl 168 7800 0 7757 4 1 3 3 0 8 0
vmmpepl 168 54591 0 52755 99 1 98 99 0 357 12
vmsppl 368 716 0 687 4 1 3 4 0 8 0
rwobjpl 40 18165 0 17136 15 0 15 15 0 8 0
pdppl 4096 1440 0 1374 98 32 66 80 0 8 0
pvpl 32 338901 0 327072 135 1 134 135 0 265 30
pmappl 216 716 0 687 3 0 3 3 0 8 0
extentpl 40 46 0 28 1 0 1 1 0 8 0
phpool 112 702 0 59 19 0 19 19 0 8 0
ddb> machine ddbcpu 0
No such command
ddb> trace
rtable_match(18,ffff800001621860,0) at rtable_match+0xd8 satoaddr sys/net/rtable.c:917 [inline]
rtable_match(18,ffff800001621860,0) at rtable_match+0xd8 sys/net/rtable.c:496
rtm_output(ffff800001621800,ffff80003c9198c8,ffff80003c919820,3f,18) at rtm_output+0x18e sys/net/rtsock.c:924
route_output(ffffef806e0e4500,ffff80000166c8d0) at route_output+0xa6a sys/net/rtsock.c:862
route_send(ffff80000166c8d0,ffffef806e0e4500,0,0) at route_send+0xd7 sys/net/rtsock.c:322
sosend(ffff80000166c8d0,0,ffff80003c919a78,0,0,408) at sosend+0x804 sys/kern/uipc_socket.c:-1
sendit(ffff80002a75b4d8,4,ffff80003c919b70,408,ffff80003c919c10) at sendit+0x5a5 sys/kern/uipc_syscalls.c:785
sys_sendto(ffff80002a75b4d8,ffff80003c919cc0,ffff80003c919c10) at sys_sendto+0x8d sys/kern/uipc_syscalls.c:563
syscall(ffff80003c919cc0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline]
syscall(ffff80003c919cc0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x2c11920c0d0, count: -9
ddb> machine ddbcpu 1
No such command
ddb> trace
rtable_match(18,ffff800001621860,0) at rtable_match+0xd8 satoaddr sys/net/rtable.c:917 [inline]
rtable_match(18,ffff800001621860,0) at rtable_match+0xd8 sys/net/rtable.c:496
rtm_output(ffff800001621800,ffff80003c9198c8,ffff80003c919820,3f,18) at rtm_output+0x18e sys/net/rtsock.c:924
route_output(ffffef806e0e4500,ffff80000166c8d0) at route_output+0xa6a sys/net/rtsock.c:862
route_send(ffff80000166c8d0,ffffef806e0e4500,0,0) at route_send+0xd7 sys/net/rtsock.c:322
sosend(ffff80000166c8d0,0,ffff80003c919a78,0,0,408) at sosend+0x804 sys/kern/uipc_socket.c:-1
sendit(ffff80002a75b4d8,4,ffff80003c919b70,408,ffff80003c919c10) at sendit+0x5a5 sys/kern/uipc_syscalls.c:785
sys_sendto(ffff80002a75b4d8,ffff80003c919cc0,ffff80003c919c10) at sys_sendto+0x8d sys/kern/uipc_syscalls.c:563
syscall(ffff80003c919cc0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline]
syscall(ffff80003c919cc0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x2c11920c0d0, count: -9


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