general protection fault, probably for non-canonical address 0xdffffc000000004c: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000260-0x0000000000000267] CPU: 0 PID: 1466 Comm: syz-executor.1 Not tainted 5.11.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:ip6_ignore_linkdown include/net/addrconf.h:407 [inline] RIP: 0010:find_match.part.0+0xcc/0xc60 net/ipv6/route.c:755 Code: f9 0f b6 45 c0 84 c0 0f 84 30 04 00 00 e8 7c a0 c0 f9 49 8d bf 60 02 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e 88 06 00 00 45 8b bf 60 02 00 RSP: 0018:ffffc9000193f000 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: ffff8880126546a0 RCX: ffffc9000af1a000 RDX: 000000000000004c RSI: ffffffff87b237a4 RDI: 0000000000000260 RBP: ffffc9000193f070 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff87b23c07 R11: 0000000000000000 R12: 0000000000000003 R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000000 FS: 00007f9a60cd2700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2df23000 CR3: 000000002dbdc000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: find_match net/ipv6/route.c:842 [inline] __find_rr_leaf+0x17f/0xd10 net/ipv6/route.c:843 find_rr_leaf net/ipv6/route.c:864 [inline] rt6_select net/ipv6/route.c:908 [inline] fib6_table_lookup+0x5b3/0xa20 net/ipv6/route.c:2195 ip6_pol_route+0x1e1/0x11c0 net/ipv6/route.c:2231 pol_lookup_func include/net/ip6_fib.h:579 [inline] fib6_rule_lookup+0x111/0x6f0 net/ipv6/fib6_rules.c:115 ip6_route_output_flags_noref+0x2e2/0x380 net/ipv6/route.c:2512 ip6_route_output_flags+0x8b/0x310 net/ipv6/route.c:2525 ip6_route_output include/net/ip6_route.h:98 [inline] ip6_dst_lookup_tail+0xb6e/0x1740 net/ipv6/ip6_output.c:1064 ip6_dst_lookup_flow+0x8c/0x1d0 net/ipv6/ip6_output.c:1194 ip6_sk_dst_lookup_flow+0x598/0x9d0 net/ipv6/ip6_output.c:1232 udpv6_sendmsg+0x18f0/0x2c40 net/ipv6/udp.c:1507 inet6_sendmsg+0x99/0xe0 net/ipv6/af_inet6.c:642 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:672 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2348 ___sys_sendmsg+0xf3/0x170 net/socket.c:2402 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2435 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x465ef9 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f9a60cd2188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000465ef9 RDX: 0000000000000000 RSI: 0000000020000040 RDI: 0000000000000004 RBP: 00000000004bcd1c R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007ffee84e345f R14: 00007f9a60cd2300 R15: 0000000000022000 Modules linked in: ---[ end trace 9bdbb7afd2098aaf ]--- RIP: 0010:ip6_ignore_linkdown include/net/addrconf.h:407 [inline] RIP: 0010:find_match.part.0+0xcc/0xc60 net/ipv6/route.c:755 Code: f9 0f b6 45 c0 84 c0 0f 84 30 04 00 00 e8 7c a0 c0 f9 49 8d bf 60 02 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e 88 06 00 00 45 8b bf 60 02 00 RSP: 0018:ffffc9000193f000 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: ffff8880126546a0 RCX: ffffc9000af1a000 RDX: 000000000000004c RSI: ffffffff87b237a4 RDI: 0000000000000260 RBP: ffffc9000193f070 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff87b23c07 R11: 0000000000000000 R12: 0000000000000003 R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000000 FS: 00007f9a60cd2700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000053b198 CR3: 000000002dbdc000 CR4: 00000000001506e0 DR0: 0000000000000436 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600