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: 7545 Comm: syz.9.1872 Tainted: G W 5.10.239-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 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 53 fb a7 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 2b fb a7 fd 4d 8b 24 24 4d 85 e4 0f RSP: 0018:ffffc90000b26b70 EFLAGS: 00010206 RAX: 000000000000005c RBX: 0000000000000002 RCX: dffffc0000000000 RDX: ffff88810c0f13c0 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90000b26bf8 R08: ffffc90000b26f20 R09: ffffc90000b26f30 R10: fffff52000164e06 R11: 1ffff92000164e02 R12: 00000000000002e0 R13: 1ffff11022cfbd64 R14: ffff8881167deb20 R15: 0000000000000000 FS: 00007fe4911046c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000010000 CR3: 000000011fc8c000 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_input+0x56/0x80 net/ipv6/route.c:2284 pol_lookup_func include/net/ip6_fib.h:594 [inline] fib6_rule_lookup+0x2ef/0x560 net/ipv6/fib6_rules.c:120 ip6_route_input_lookup net/ipv6/route.c:2296 [inline] ip6_route_input+0x58b/0x780 net/ipv6/route.c:2465 ip6_rcv_finish_core net/ipv6/ip6_input.c:67 [inline] ip6_list_rcv_finish net/ipv6/ip6_input.c:131 [inline] ip6_sublist_rcv+0x633/0xe60 net/ipv6/ip6_input.c:311 ipv6_list_rcv+0x3dd/0x430 net/ipv6/ip6_input.c:346 __netif_receive_skb_list_ptype net/core/dev.c:5445 [inline] __netif_receive_skb_list_core+0x574/0x740 net/core/dev.c:5493 __netif_receive_skb_list net/core/dev.c:5545 [inline] netif_receive_skb_list_internal+0x7d2/0xa60 net/core/dev.c:5655 gro_normal_list net/core/dev.c:5809 [inline] napi_complete_done+0x36f/0x770 net/core/dev.c:6558 napi_complete include/linux/netdevice.h:499 [inline] tun_get_user+0x2447/0x3090 drivers/net/tun.c:2005 tun_chr_write_iter+0x1bf/0x270 drivers/net/tun.c:2059 call_write_iter include/linux/fs.h:2066 [inline] new_sync_write fs/read_write.c:518 [inline] vfs_write+0x725/0xd60 fs/read_write.c:605 ksys_write+0x140/0x240 fs/read_write.c:658 __do_sys_write fs/read_write.c:670 [inline] __se_sys_write fs/read_write.c:667 [inline] __x64_sys_write+0x7b/0x90 fs/read_write.c:667 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7fe492a9b9a9 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:00007fe491104038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fe492cc2fa0 RCX: 00007fe492a9b9a9 RDX: 000000000000fdef RSI: 0000200000000440 RDI: 0000000000000003 RBP: 00007fe492b1dd69 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fe492cc2fa0 R15: 00007fff1f7e2518 Modules linked in: ---[ end trace 8beb5f72a7da7214 ]--- 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 53 fb a7 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 2b fb a7 fd 4d 8b 24 24 4d 85 e4 0f RSP: 0018:ffffc90000b26b70 EFLAGS: 00010206 RAX: 000000000000005c RBX: 0000000000000002 RCX: dffffc0000000000 RDX: ffff88810c0f13c0 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90000b26bf8 R08: ffffc90000b26f20 R09: ffffc90000b26f30 R10: fffff52000164e06 R11: 1ffff92000164e02 R12: 00000000000002e0 R13: 1ffff11022cfbd64 R14: ffff8881167deb20 R15: 0000000000000000 FS: 00007fe4911046c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000010000 CR3: 000000011fc8c000 CR4: 00000000003506b0 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 53 fb a7 fd call 0xfda7fb63 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 2b fb a7 fd call 0xfda7fb63 38: 4d 8b 24 24 mov (%r12),%r12 3c: 4d 85 e4 test %r12,%r12 3f: 0f .byte 0xf