general protection fault, probably for non-canonical address 0xdffffc000000005e: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x00000000000002f0-0x00000000000002f7] CPU: 0 PID: 28401 Comm: syz.1.7534 Tainted: G W 5.15.185-syzkaller-00207-g32c443bd6d40 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:__in6_dev_get include/net/addrconf.h:341 [inline] RIP: 0010:ip6_ignore_linkdown include/net/addrconf.h:432 [inline] RIP: 0010:find_match+0xb7/0xf20 net/ipv6/route.c:744 Code: 7c 05 00 00 74 08 48 89 df e8 45 35 87 fd 48 89 d8 bb f0 02 00 00 48 03 18 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 48 89 df e8 1b 35 87 fd 48 8b 1b 48 85 db 0f 84 RSP: 0018:ffffc90000bb7100 EFLAGS: 00010202 RAX: 000000000000005e RBX: 00000000000002f0 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90000bb71b8 R08: ffffc90000bb74e0 R09: ffffc90000bb74f0 R10: fffff52000176ebe R11: 1ffff92000176eba R12: 0000000000000201 R13: 1ffff11023cf7ca4 R14: 0000000000000000 R15: 0000000000000003 FS: 0000555572a8b500(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000c7c030 CR3: 0000000118ede000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000004144 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Call Trace: rt6_nh_find_match+0xd9/0x140 net/ipv6/route.c:784 nexthop_for_each_fib6_nh+0xf6/0x1e0 net/ipv4/nexthop.c:1242 __find_rr_leaf+0x50f/0x900 net/ipv6/route.c:825 find_rr_leaf net/ipv6/route.c:853 [inline] rt6_select net/ipv6/route.c:897 [inline] fib6_table_lookup+0x2f4/0x9f0 net/ipv6/route.c:2189 ip6_pol_route+0x145/0x1110 net/ipv6/route.c:2225 ip6_pol_route_output+0x51/0x80 net/ipv6/route.c:2601 pol_lookup_func include/net/ip6_fib.h:592 [inline] fib6_rule_lookup+0x2ef/0x560 net/ipv6/fib6_rules.c:120 ip6_route_output_flags_noref+0x283/0x340 net/ipv6/route.c:2633 ip6_route_output_flags+0x3c/0x200 net/ipv6/route.c:2646 ip6_dst_lookup_tail+0x591/0x1370 net/ipv6/ip6_output.c:1129 ip6_dst_lookup_flow+0x49/0xc0 net/ipv6/ip6_output.c:1232 ip6_datagram_dst_update+0x54c/0xa20 net/ipv6/datagram.c:89 ip6_datagram_release_cb+0x201/0x2b0 net/ipv6/datagram.c:130 release_sock+0xb3/0x1b0 net/core/sock.c:3288 udpv6_destroy_sock+0xd2/0x220 net/ipv6/udp.c:1658 sk_common_release+0x6e/0x310 net/core/sock.c:3467 udp_lib_close+0x15/0x20 include/net/udp.h:212 inet_release+0x183/0x200 net/ipv4/af_inet.c:432 inet6_release+0x57/0x70 net/ipv6/af_inet6.c:489 __sock_release net/socket.c:649 [inline] sock_close+0xe0/0x270 net/socket.c:1336 __fput+0x20b/0x8b0 fs/file_table.c:311 ____fput+0x15/0x20 fs/file_table.c:339 task_work_run+0x127/0x190 kernel/task_work.c:188 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop+0xd0/0xe0 kernel/entry/common.c:181 exit_to_user_mode_prepare+0x5a/0xa0 kernel/entry/common.c:214 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline] syscall_exit_to_user_mode+0x1a/0x30 kernel/entry/common.c:307 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f8c66105929 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:00007ffc5e16d7b8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: 0000000000000000 RBX: 00007f8c6632eba0 RCX: 00007f8c66105929 RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 RBP: 00007f8c6632eba0 R08: 00000000000001b0 R09: 000000185e16daaf R10: 00000000003ffc2c R11: 0000000000000246 R12: 0000000000164148 R13: 00007ffc5e16d8b0 R14: ffffffffffffffff R15: 00007ffc5e16d8d0 Modules linked in: ---[ end trace f9422110735b3843 ]--- RIP: 0010:__in6_dev_get include/net/addrconf.h:341 [inline] RIP: 0010:ip6_ignore_linkdown include/net/addrconf.h:432 [inline] RIP: 0010:find_match+0xb7/0xf20 net/ipv6/route.c:744 Code: 7c 05 00 00 74 08 48 89 df e8 45 35 87 fd 48 89 d8 bb f0 02 00 00 48 03 18 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 48 89 df e8 1b 35 87 fd 48 8b 1b 48 85 db 0f 84 RSP: 0018:ffffc90000bb7100 EFLAGS: 00010202 RAX: 000000000000005e RBX: 00000000000002f0 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90000bb71b8 R08: ffffc90000bb74e0 R09: ffffc90000bb74f0 R10: fffff52000176ebe R11: 1ffff92000176eba R12: 0000000000000201 R13: 1ffff11023cf7ca4 R14: 0000000000000000 R15: 0000000000000003 FS: 0000555572a8b500(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000c7c030 CR3: 0000000118ede000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000004144 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 7c 05 jl 0x7 2: 00 00 add %al,(%rax) 4: 74 08 je 0xe 6: 48 89 df mov %rbx,%rdi 9: e8 45 35 87 fd call 0xfd873553 e: 48 89 d8 mov %rbx,%rax 11: bb f0 02 00 00 mov $0x2f0,%ebx 16: 48 03 18 add (%rax),%rbx 19: 48 89 d8 mov %rbx,%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: 48 89 df mov %rbx,%rdi 33: e8 1b 35 87 fd call 0xfd873553 38: 48 8b 1b mov (%rbx),%rbx 3b: 48 85 db test %rbx,%rbx 3e: 0f .byte 0xf 3f: 84 .byte 0x84