general protection fault, probably for non-canonical address 0xdffffc000000005e: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x00000000000002f0-0x00000000000002f7]
CPU: 1 PID: 19391 Comm: syz.6.7841 Not tainted 5.15.185-syzkaller-00178-g5cf73bface18 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:__in6_dev_get include/net/addrconf.h:341 [inline]
RIP: 0010:ip6_ignore_linkdown include/net/addrconf.h:432 [inline]
RIP: 0010:find_match+0xb7/0xf20 net/ipv6/route.c:744
Code: 7c 05 00 00 74 08 48 89 df e8 45 30 87 fd 48 89 d8 bb f0 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 1b 30 87 fd 48 8b 1b 48 85 db 0f 84
RSP: 0018:ffffc90000ec6f40 EFLAGS: 00010202
RAX: 000000000000005e RBX: 00000000000002f0 RCX: dffffc0000000000
RDX: 0000000000000002 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000ec6ff8 R08: ffffc90000ec7320 R09: ffffc90000ec7330
R10: fffff520001d8e86 R11: 1ffff920001d8e82 R12: 0000000000000201
R13: 1ffff11027206a04 R14: 0000000000000000 R15: 0000000000000003
FS: 00007fc9cf26e6c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc9cf26df98 CR3: 0000000118f37000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 00000000000032e7 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
rt6_nh_find_match+0xd9/0x140 net/ipv6/route.c:784
nexthop_for_each_fib6_nh+0xf6/0x1e0 net/ipv4/nexthop.c:1242
__find_rr_leaf+0x50f/0x900 net/ipv6/route.c:825
find_rr_leaf net/ipv6/route.c:853 [inline]
rt6_select net/ipv6/route.c:897 [inline]
fib6_table_lookup+0x2f4/0x9f0 net/ipv6/route.c:2189
ip6_pol_route+0x145/0x1110 net/ipv6/route.c:2225
ip6_pol_route_output+0x51/0x80 net/ipv6/route.c:2601
pol_lookup_func include/net/ip6_fib.h:592 [inline]
fib6_rule_lookup+0x2ef/0x560 net/ipv6/fib6_rules.c:120
ip6_route_output_flags_noref+0x283/0x340 net/ipv6/route.c:2633
ip6_route_output_flags+0x3c/0x200 net/ipv6/route.c:2646
ip6_route_output include/net/ip6_route.h:98 [inline]
ip6_dst_lookup_tail+0x139/0x1370 net/ipv6/ip6_output.c:1102
ip6_dst_lookup_flow net/ipv6/ip6_output.c:1232 [inline]
ip6_sk_dst_lookup_flow+0x56e/0x820 net/ipv6/ip6_output.c:1270
udpv6_sendmsg+0x17d7/0x2670 net/ipv6/udp.c:1561
inet6_sendmsg+0xa5/0xc0 net/ipv6/af_inet6.c:660
sock_sendmsg_nosec net/socket.c:704 [inline]
__sock_sendmsg net/socket.c:716 [inline]
__sys_sendto+0x423/0x580 net/socket.c:2063
__do_sys_sendto net/socket.c:2075 [inline]
__se_sys_sendto net/socket.c:2071 [inline]
__x64_sys_sendto+0xe5/0x100 net/socket.c:2071
x64_sys_call+0x178/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:45
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fc9d0c26929
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:00007fc9cf26e038 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007fc9d0e4e080 RCX: 00007fc9d0c26929
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 00007fc9d0ca8b39 R08: 0000200000000300 R09: 000000000000001c
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007fc9d0e4e080 R15: 00007fff8a4f1398
</TASK>
Modules linked in:
---[ end trace cb42717fad4a0cad ]---
RIP: 0010:__in6_dev_get include/net/addrconf.h:341 [inline]
RIP: 0010:ip6_ignore_linkdown include/net/addrconf.h:432 [inline]
RIP: 0010:find_match+0xb7/0xf20 net/ipv6/route.c:744
Code: 7c 05 00 00 74 08 48 89 df e8 45 30 87 fd 48 89 d8 bb f0 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 1b 30 87 fd 48 8b 1b 48 85 db 0f 84
RSP: 0018:ffffc90000ec6f40 EFLAGS: 00010202
RAX: 000000000000005e RBX: 00000000000002f0 RCX: dffffc0000000000
RDX: 0000000000000002 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000ec6ff8 R08: ffffc90000ec7320 R09: ffffc90000ec7330
R10: fffff520001d8e86 R11: 1ffff920001d8e82 R12: 0000000000000201
R13: 1ffff11027206a04 R14: 0000000000000000 R15: 0000000000000003
FS: 00007fc9cf26e6c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b33e18ff8 CR3: 0000000118f37000 CR4: 00000000003506b0
----------------
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 45 30 87 fd call 0xfd873053
e: 48 89 d8 mov %rbx,%rax
11: bb f0 02 00 00 mov $0x2f0,%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 1b 30 87 fd call 0xfd873053
38: 48 8b 1b mov (%rbx),%rbx
3b: 48 85 db test %rbx,%rbx
3e: 0f .byte 0xf
3f: 84 .byte 0x84