panic: kernel diagnostic assertio

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 9c1a3717ded9 Use MAKEDEV_PARTITIONS=16 to create fewer par..
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=10ceba12580000
kernel config: https://syzkaller.appspot.com/x/.config?x=7058272de1526588
dashboard link: https://syzkaller.appspot.com/bug?extid=fcf0bb9f501e6b8eecb0

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

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/4f52efa2641a/disk-9c1a3717.raw.xz
bsd.gdb: https://storage.googleapis.com/syzbot-assets/f949cde36873/bsd-9c1a3717.gdb.xz
kernel image: https://storage.googleapis.com/syzbot-assets/2a5382e48f8a/kernel-9c1a3717.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+fcf0bb...@syzkaller.appspotmail.com

panic: kernel diagnostic assertio
n "info->rti_ifa->ifa_ifp != NULL
" failed: file "/syzkaller/manage
rs/multicore/kernel/sys/net/route
.c", line 993
Starting stack trace...
panic(ffffffff8339d6d3) at panic+0x1d0 sys/kern/subr_prf.c:229
__assert(ffffffff833de5b3,ffffffff833659a0,3e1,ffffffff8331651d) at __assert+0x29 sys/kern/subr_prf.c:-1
rtrequest(1,ffff80002a2f0508,0,ffff80002a2f0470,0) at rtrequest+0xe63 sys/net/route.c:1089
rtm_output(ffff800001545000,ffff80002a2f05a8,ffff80002a2f0508,0,0) at rtm_output+0x93d sys/net/rtsock.c:953
route_output(fffffd8065cbd600,ffff8000016964e8) at route_output+0x9ef sys/net/rtsock.c:858
route_send(ffff8000016964e8,fffffd8065cbd600,0,0) at route_send+0xd7 sys/net/rtsock.c:322
sosend(ffff8000016964e8,0,ffff80002a2f0758,0,0,8) at sosend+0x804 sys/kern/uipc_socket.c:-1
sendit(ffff80002a28f770,7,ffff80002a2f0850,8,ffff80002a2f0900) at sendit+0x5a5 sys/kern/uipc_syscalls.c:785
sys_sendto(ffff80002a28f770,ffff80002a2f09b0,ffff80002a2f0900) at sys_sendto+0x8d sys/kern/uipc_syscalls.c:563
syscall(ffff80002a2f09b0) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80002a2f09b0) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:765
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x44e22ab2730, count: 246
End of stack trace.


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