general protection fault, probably for non-canonical address 0xdffffc000000005b: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x00000000000002d8-0x00000000000002df]
CPU: 0 PID: 21152 Comm: syz.9.5285 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:__in6_dev_get include/net/addrconf.h:355 [inline]
RIP: 0010:ip6_ignore_linkdown include/net/addrconf.h:446 [inline]
RIP: 0010:find_match+0xb7/0xf20 net/ipv6/route.c:781
Code: 7c 05 00 00 74 08 48 89 df e8 55 e3 5f fd 48 89 d8 bb d8 02 00 00 48 03 18 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 48 89 df e8 2b e3 5f fd 48 8b 1b 48 85 db 0f 84
RSP: 0018:ffffc900053cf0c0 EFLAGS: 00010202
RAX: 000000000000005b RBX: 00000000000002d8 RCX: dffffc0000000000
RDX: ffff888130755100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900053cf178 R08: ffffc900053cf4a0 R09: ffffc900053cf4b0
R10: 0000000000000000 R11: 1ffff92000a79eb6 R12: 0000000000000201
R13: 1ffff11025e7ce24 R14: 0000000000000000 R15: 0000000000000003
FS: 00007fbce78376c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbce7836f98 CR3: 0000000110afe000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
rt6_nh_find_match+0xd9/0x140 net/ipv6/route.c:821
nexthop_for_each_fib6_nh+0x107/0x200 net/ipv4/nexthop.c:1243
__find_rr_leaf+0x50f/0x900 net/ipv6/route.c:862
find_rr_leaf net/ipv6/route.c:890 [inline]
rt6_select net/ipv6/route.c:934 [inline]
fib6_table_lookup+0x2c1/0x9a0 net/ipv6/route.c:2223
ip6_pol_route+0x14c/0x1110 net/ipv6/route.c:2259
ip6_pol_route_output+0x51/0x80 net/ipv6/route.c:2634
pol_lookup_func include/net/ip6_fib.h:589 [inline]
fib6_rule_lookup+0x311/0x580 net/ipv6/fib6_rules.c:121
ip6_route_output_flags_noref+0x283/0x340 net/ipv6/route.c:2666
ip6_route_output_flags+0x3c/0x200 net/ipv6/route.c:2679
ip6_route_output include/net/ip6_route.h:98 [inline]
ip6_dst_lookup_tail+0x194/0x1460 net/ipv6/ip6_output.c:1124
ip6_dst_lookup_flow+0x49/0xc0 net/ipv6/ip6_output.c:1255
ip6_datagram_dst_update+0x556/0xa50 net/ipv6/datagram.c:94
__ip6_datagram_connect+0xbeb/0x1150 net/ipv6/datagram.c:253
ip6_datagram_connect net/ipv6/datagram.c:277 [inline]
ip6_datagram_connect_v6_only+0x66/0xa0 net/ipv6/datagram.c:289
inet_dgram_connect+0x212/0x450 net/ipv4/af_inet.c:589
__sys_connect_file net/socket.c:2001 [inline]
__sys_connect+0x398/0x420 net/socket.c:2018
__do_sys_connect net/socket.c:2028 [inline]
__se_sys_connect net/socket.c:2025 [inline]
__x64_sys_connect+0x7a/0x90 net/socket.c:2025
x64_sys_call+0x88d/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:43
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fbce698eec9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fbce7837038 EFLAGS: 00000246 ORIG_RAX: 000000000000002a
RAX: ffffffffffffffda RBX: 00007fbce6be6090 RCX: 00007fbce698eec9
RDX: 000000000000001c RSI: 00002000000000c0 RDI: 0000000000000003
RBP: 00007fbce6a11f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fbce6be6128 R14: 00007fbce6be6090 R15: 00007fff7fe37908
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__in6_dev_get include/net/addrconf.h:355 [inline]
RIP: 0010:ip6_ignore_linkdown include/net/addrconf.h:446 [inline]
RIP: 0010:find_match+0xb7/0xf20 net/ipv6/route.c:781
Code: 7c 05 00 00 74 08 48 89 df e8 55 e3 5f fd 48 89 d8 bb d8 02 00 00 48 03 18 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 48 89 df e8 2b e3 5f fd 48 8b 1b 48 85 db 0f 84
RSP: 0018:ffffc900053cf0c0 EFLAGS: 00010202
RAX: 000000000000005b RBX: 00000000000002d8 RCX: dffffc0000000000
RDX: ffff888130755100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900053cf178 R08: ffffc900053cf4a0 R09: ffffc900053cf4b0
R10: 0000000000000000 R11: 1ffff92000a79eb6 R12: 0000000000000201
R13: 1ffff11025e7ce24 R14: 0000000000000000 R15: 0000000000000003
FS: 00007fbce78376c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000ffffffff CR3: 0000000110afe000 CR4: 00000000003506a0
----------------
Code disassembly (best guess):
0: 7c 05 jl 0x7
2: 00 00 add %al,(%rax)
4: 74 08 je 0xe
6: 48 89 df mov %rbx,%rdi
9: e8 55 e3 5f fd call 0xfd5fe363
e: 48 89 d8 mov %rbx,%rax
11: bb d8 02 00 00 mov $0x2d8,%ebx
16: 48 03 18 add (%rax),%rbx
19: 48 89 d8 mov %rbx,%rax
1c: 48 c1 e8 03 shr $0x3,%rax
20: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx
27: fc ff df
* 2a: 80 3c 08 00 cmpb $0x0,(%rax,%rcx,1) <-- trapping instruction
2e: 74 08 je 0x38
30: 48 89 df mov %rbx,%rdi
33: e8 2b e3 5f fd call 0xfd5fe363
38: 48 8b 1b mov (%rbx),%rbx
3b: 48 85 db test %rbx,%rbx
3e: 0f .byte 0xf
3f: 84 .byte 0x84