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: 7065 Comm: syz.6.1922 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:ffffc90001516c10 EFLAGS: 00010206 RAX: 000000000000005c RBX: 0000000000000003 RCX: dffffc0000000000 RDX: ffff888110a213c0 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90001516c98 R08: ffffc90001516fc0 R09: ffffc90001516fd0 R10: fffff520002a2e1a R11: 1ffff920002a2e16 R12: 00000000000002e0 R13: 1ffff11023da45c4 R14: ffff88811ed22e20 R15: 0000000000000000 FS: 00007f2b8f9ad6c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000001880 CR3: 000000010fab4000 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_action net/ipv6/fib6_rules.c:232 [inline] fib6_rule_action+0x1c7/0x710 net/ipv6/fib6_rules.c:270 fib_rules_lookup+0x489/0x8d0 net/core/fib_rules.c:318 fib6_rule_lookup+0x179/0x560 net/ipv6/fib6_rules.c:107 ip6_route_output_flags_noref+0x248/0x2f0 net/ipv6/route.c:2507 ip6_route_output_flags+0x3c/0x200 net/ipv6/route.c:2520 ip6_dst_lookup_tail+0x1b9/0x1210 net/ipv6/ip6_output.c:1117 ip6_dst_lookup_flow+0x49/0xc0 net/ipv6/ip6_output.c:1220 rawv6_sendmsg+0xbf0/0x16b0 net/ipv6/raw.c:933 inet_sendmsg+0xa5/0xc0 net/ipv4/af_inet.c:830 sock_sendmsg_nosec net/socket.c:652 [inline] __sock_sendmsg net/socket.c:664 [inline] ____sys_sendmsg+0x5a2/0x8c0 net/socket.c:2376 ___sys_sendmsg+0x1f0/0x260 net/socket.c:2430 __sys_sendmmsg+0x273/0x450 net/socket.c:2516 __do_sys_sendmmsg net/socket.c:2545 [inline] __se_sys_sendmmsg net/socket.c:2542 [inline] __x64_sys_sendmmsg+0xa0/0xb0 net/socket.c:2542 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f2b91365969 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:00007f2b8f9ad038 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 00007f2b9158d080 RCX: 00007f2b91365969 RDX: 0000000000000001 RSI: 0000200000001880 RDI: 0000000000000005 RBP: 00007f2b913e7ab1 R08: 0000000000000000 R09: 0000000000000000 R10: 000000004400c840 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f2b9158d080 R15: 00007ffef6480d58 Modules linked in: ---[ end trace 657d13b5f4084c5e ]--- 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:ffffc90001516c10 EFLAGS: 00010206 ---------------- 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