general protection fault, probably for non-canonical address 0xdffffc0000000020: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000100-0x0000000000000107] CPU: 1 PID: 8675 Comm: syz.3.2407 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:__rt6_device_match net/ipv6/route.c:473 [inline] RIP: 0010:__rt6_nh_dev_match+0x121/0x220 net/ipv6/route.c:497 Code: 74 08 48 89 df e8 4f aa a9 fd 48 8b 1b 31 ff 44 89 fe e8 32 be 6f fd 45 85 ff 74 40 48 81 c3 00 01 00 00 48 89 d8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 ce 00 00 00 8b 1b 89 df 44 89 fe e8 d6 RSP: 0018:ffffc90000df6578 EFLAGS: 00010202 RAX: 0000000000000020 RBX: 0000000000000100 RCX: 0000000000000002 RDX: ffff8881287b13c0 RSI: 000000000000000d RDI: 0000000000000000 RBP: ffffc90000df65b8 R08: dffffc0000000000 R09: ffffc90000df6720 R10: fffff520001bece8 R11: 1ffff920001bece4 R12: dffffc0000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 000000000000000d FS: 00007fc906bc96c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 0000000126426000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: nexthop_for_each_fib6_nh+0xf6/0x1e0 net/ipv4/nexthop.c:602 rt6_nh_dev_match net/ipv6/route.c:517 [inline] rt6_device_match net/ipv6/route.c:546 [inline] ip6_pol_route_lookup+0x5bb/0x17d0 net/ipv6/route.c:1220 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 rt6_lookup+0x116/0x1d0 net/ipv6/route.c:1279 ip6_tnl_link_config+0x443/0x9c0 net/ipv6/ip6_tunnel.c:1507 ip6_tnl_dev_init+0x46e/0x640 net/ipv6/ip6_tunnel.c:1937 register_netdevice+0x351/0x13c0 net/core/dev.c:9986 ip6_tnl_create2+0xc2/0x360 net/ipv6/ip6_tunnel.c:290 ip6_tnl_newlink+0x391/0x710 net/ipv6/ip6_tunnel.c:2080 __rtnl_newlink net/core/rtnetlink.c:3482 [inline] rtnl_newlink+0x11bd/0x1640 net/core/rtnetlink.c:3530 rtnetlink_rcv_msg+0x9db/0xb90 net/core/rtnetlink.c:5610 netlink_rcv_skb+0x1e0/0x430 net/netlink/af_netlink.c:2485 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:5628 netlink_unicast_kernel net/netlink/af_netlink.c:1307 [inline] netlink_unicast+0x87c/0xa40 net/netlink/af_netlink.c:1333 netlink_sendmsg+0x88d/0xb30 net/netlink/af_netlink.c:1901 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_sendmsg net/socket.c:2459 [inline] __do_sys_sendmsg net/socket.c:2468 [inline] __se_sys_sendmsg net/socket.c:2466 [inline] __x64_sys_sendmsg+0x1e2/0x2a0 net/socket.c:2466 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7fc9085a2969 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:00007fc906bc9038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fc9087ca160 RCX: 00007fc9085a2969 RDX: 0000000000000000 RSI: 0000200000000000 RDI: 0000000000000005 RBP: 00007fc908624ab1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fc9087ca160 R15: 00007ffc50f5b918 Modules linked in: ---[ end trace 5f852ca734ace620 ]--- RIP: 0010:__rt6_device_match net/ipv6/route.c:473 [inline] RIP: 0010:__rt6_nh_dev_match+0x121/0x220 net/ipv6/route.c:497 Code: 74 08 48 89 df e8 4f aa a9 fd 48 8b 1b 31 ff 44 89 fe e8 32 be 6f fd 45 85 ff 74 40 48 81 c3 00 01 00 00 48 89 d8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 ce 00 00 00 8b 1b 89 df 44 89 fe e8 d6 RSP: 0018:ffffc90000df6578 EFLAGS: 00010202 RAX: 0000000000000020 RBX: 0000000000000100 RCX: 0000000000000002 RDX: ffff8881287b13c0 RSI: 000000000000000d RDI: 0000000000000000 RBP: ffffc90000df65b8 R08: dffffc0000000000 R09: ffffc90000df6720 R10: fffff520001bece8 R11: 1ffff920001bece4 R12: dffffc0000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 000000000000000d FS: 00007fc906bc96c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 0000000126426000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 74 08 je 0xa 2: 48 89 df mov %rbx,%rdi 5: e8 4f aa a9 fd call 0xfda9aa59 a: 48 8b 1b mov (%rbx),%rbx d: 31 ff xor %edi,%edi f: 44 89 fe mov %r15d,%esi 12: e8 32 be 6f fd call 0xfd6fbe49 17: 45 85 ff test %r15d,%r15d 1a: 74 40 je 0x5c 1c: 48 81 c3 00 01 00 00 add $0x100,%rbx 23: 48 89 d8 mov %rbx,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 0f b6 04 20 movzbl (%rax,%r12,1),%eax <-- trapping instruction 2f: 84 c0 test %al,%al 31: 0f 85 ce 00 00 00 jne 0x105 37: 8b 1b mov (%rbx),%ebx 39: 89 df mov %ebx,%edi 3b: 44 89 fe mov %r15d,%esi 3e: e8 .byte 0xe8 3f: d6 (bad)