general protection fault, probably for non-canonical address 0xdffffc000000005c: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x00000000000002e0-0x00000000000002e7] CPU: 0 PID: 5373 Comm: syz.2.1572 Not tainted 5.10.237-syzkaller-00309-g7e2543346ff7 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 RIP: 0010:__in6_dev_get include/net/addrconf.h:343 [inline] RIP: 0010:ip6_ignore_linkdown include/net/addrconf.h:434 [inline] RIP: 0010:find_match+0xa7/0xd60 net/ipv6/route.c:739 Code: 41 80 7c 05 00 00 74 08 4c 89 f7 e8 63 8c a9 fd 41 bc e0 02 00 00 4d 03 26 4c 89 e0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 e7 e8 3b 8c a9 fd 4d 8b 24 24 4d 85 e4 0f RSP: 0018:ffffc90000d8edb0 EFLAGS: 00010206 RAX: 000000000000005c RBX: 0000000000000003 RCX: dffffc0000000000 RDX: ffff888110bc4f00 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90000d8ee38 R08: ffffc90000d8f160 R09: ffffc90000d8f170 R10: fffff520001b1e4e R11: 1ffff920001b1e4a R12: 00000000000002e0 R13: 1ffff11022bd6604 R14: ffff888115eb3020 R15: 0000000000000000 FS: 00007fcd5c3b06c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000b63fe4 CR3: 0000000126f66000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rt6_nh_find_match+0xd9/0x140 net/ipv6/route.c:779 nexthop_for_each_fib6_nh+0xf6/0x1e0 net/ipv4/nexthop.c:602 __find_rr_leaf+0x50f/0x900 net/ipv6/route.c:820 find_rr_leaf net/ipv6/route.c:848 [inline] rt6_select net/ipv6/route.c:892 [inline] fib6_table_lookup+0x2f4/0x9f0 net/ipv6/route.c:2190 ip6_pol_route+0x145/0x1110 net/ipv6/route.c:2226 ip6_pol_route_output+0x51/0x80 net/ipv6/route.c:2475 pol_lookup_func include/net/ip6_fib.h:594 [inline] fib6_rule_lookup+0x2ef/0x560 net/ipv6/fib6_rules.c:120 ip6_route_output_flags_noref+0x248/0x2f0 net/ipv6/route.c:2507 ip6_route_output_flags+0x3c/0x200 net/ipv6/route.c:2520 ip6_route_output include/net/ip6_route.h:98 [inline] ip6_dst_lookup_tail+0x6d1/0x1210 net/ipv6/ip6_output.c:1090 ip6_dst_lookup_flow+0x49/0xc0 net/ipv6/ip6_output.c:1220 tcp_v6_connect+0x8be/0x1990 net/ipv6/tcp_ipv6.c:286 __inet_stream_connect+0x276/0xd70 net/ipv4/af_inet.c:671 tcp_sendmsg_fastopen+0x389/0x5c0 net/ipv4/tcp.c:1181 tcp_sendmsg_locked+0x3235/0x3750 net/ipv4/tcp.c:1223 tcp_sendmsg+0x2f/0x50 net/ipv4/tcp.c:1452 inet6_sendmsg+0xa5/0xc0 net/ipv6/af_inet6.c:663 sock_sendmsg_nosec net/socket.c:652 [inline] __sock_sendmsg net/socket.c:664 [inline] __sys_sendto+0x41d/0x580 net/socket.c:2006 __do_sys_sendto net/socket.c:2018 [inline] __se_sys_sendto net/socket.c:2014 [inline] __x64_sys_sendto+0xe5/0x100 net/socket.c:2014 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7fcd5dd47969 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:00007fcd5c3b0038 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007fcd5df6efa0 RCX: 00007fcd5dd47969 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004 RBP: 00007fcd5ddc9ab1 R08: 0000200000b63fe4 R09: 000000000000001c R10: 0000000020000004 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fcd5df6efa0 R15: 00007ffceefc6e78 Modules linked in: ---[ end trace 6d264dd9e1370a59 ]--- RIP: 0010:__in6_dev_get include/net/addrconf.h:343 [inline] RIP: 0010:ip6_ignore_linkdown include/net/addrconf.h:434 [inline] RIP: 0010:find_match+0xa7/0xd60 net/ipv6/route.c:739 Code: 41 80 7c 05 00 00 74 08 4c 89 f7 e8 63 8c a9 fd 41 bc e0 02 00 00 4d 03 26 4c 89 e0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 e7 e8 3b 8c a9 fd 4d 8b 24 24 4d 85 e4 0f RSP: 0018:ffffc90000d8edb0 EFLAGS: 00010206 RAX: 000000000000005c RBX: 0000000000000003 RCX: dffffc0000000000 RDX: ffff888110bc4f00 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90000d8ee38 R08: ffffc90000d8f160 R09: ffffc90000d8f170 R10: fffff520001b1e4e R11: 1ffff920001b1e4a R12: 00000000000002e0 R13: 1ffff11022bd6604 R14: ffff888115eb3020 R15: 0000000000000000 FS: 00007fcd5c3b06c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c2c13a7 CR3: 0000000126f66000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 41 80 7c 05 00 00 cmpb $0x0,0x0(%r13,%rax,1) 6: 74 08 je 0x10 8: 4c 89 f7 mov %r14,%rdi b: e8 63 8c a9 fd call 0xfda98c73 10: 41 bc e0 02 00 00 mov $0x2e0,%r12d 16: 4d 03 26 add (%r14),%r12 19: 4c 89 e0 mov %r12,%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: 4c 89 e7 mov %r12,%rdi 33: e8 3b 8c a9 fd call 0xfda98c73 38: 4d 8b 24 24 mov (%r12),%r12 3c: 4d 85 e4 test %r12,%r12 3f: 0f .byte 0xf