general protection fault, probably for non-canonical address 0xdffffc000000005b: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x00000000000002d8-0x00000000000002df] CPU: 1 PID: 5075 Comm: syz.7.1177 Not tainted 6.1.134-syzkaller-00012-g646380b087a5 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025 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+0xb7/0xf20 net/ipv6/route.c:781 Code: 7c 05 00 00 74 08 48 89 df e8 05 f0 63 fd 48 89 d8 bb d8 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 db ef 63 fd 48 8b 1b 48 85 db 0f 84 RSP: 0018:ffffc90000dcf0e0 EFLAGS: 00010202 RAX: 000000000000005b RBX: 00000000000002d8 RCX: dffffc0000000000 RDX: ffff888109ea2880 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90000dcf198 R08: ffffc90000dcf4c0 R09: ffffc90000dcf4d0 R10: 0000000000000000 R11: 1ffff920001b9eba R12: 0000000000000201 R13: 1ffff11023829dc4 R14: 0000000000000000 R15: 0000000000000002 FS: 00007f2f9958b6c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffdeda1ea28 CR3: 000000012e399000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rt6_nh_find_match+0xd9/0x140 net/ipv6/route.c:821 nexthop_for_each_fib6_nh+0x107/0x200 net/ipv4/nexthop.c:1243 __find_rr_leaf+0x50f/0x900 net/ipv6/route.c:862 find_rr_leaf net/ipv6/route.c:890 [inline] rt6_select net/ipv6/route.c:934 [inline] fib6_table_lookup+0x2c1/0x9a0 net/ipv6/route.c:2223 ip6_pol_route+0x14c/0x1110 net/ipv6/route.c:2259 ip6_pol_route_output+0x51/0x80 net/ipv6/route.c:2634 pol_lookup_func include/net/ip6_fib.h:589 [inline] fib6_rule_lookup+0x311/0x580 net/ipv6/fib6_rules.c:121 ip6_route_output_flags_noref+0x283/0x340 net/ipv6/route.c:2666 ip6_route_output_flags+0x3c/0x200 net/ipv6/route.c:2679 ip6_route_output include/net/ip6_route.h:98 [inline] ip6_dst_lookup_tail+0x194/0x1460 net/ipv6/ip6_output.c:1124 ip6_dst_lookup_flow+0x49/0xc0 net/ipv6/ip6_output.c:1255 ip6_datagram_dst_update+0x556/0xa50 net/ipv6/datagram.c:94 __ip6_datagram_connect+0xbeb/0x1150 net/ipv6/datagram.c:253 ip6_datagram_connect+0x2d/0x40 net/ipv6/datagram.c:277 inet_dgram_connect+0x212/0x450 net/ipv4/af_inet.c:583 __sys_connect_file net/socket.c:2001 [inline] __sys_connect+0x398/0x420 net/socket.c:2018 __do_sys_connect net/socket.c:2028 [inline] __se_sys_connect net/socket.c:2025 [inline] __x64_sys_connect+0x7a/0x90 net/socket.c:2025 x64_sys_call+0x88d/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:43 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f2f9878e969 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:00007f2f9958b038 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: ffffffffffffffda RBX: 00007f2f989b5fa0 RCX: 00007f2f9878e969 RDX: 000000000000001c RSI: 0000200000000080 RDI: 0000000000000005 RBP: 00007f2f98810ab1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f2f989b5fa0 R15: 00007fff14529d68 Modules linked in: ---[ end trace 0000000000000000 ]--- 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+0xb7/0xf20 net/ipv6/route.c:781 Code: 7c 05 00 00 74 08 48 89 df e8 05 f0 63 fd 48 89 d8 bb d8 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 db ef 63 fd 48 8b 1b 48 85 db 0f 84 RSP: 0018:ffffc90000dcf0e0 EFLAGS: 00010202 RAX: 000000000000005b RBX: 00000000000002d8 RCX: dffffc0000000000 RDX: ffff888109ea2880 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90000dcf198 R08: ffffc90000dcf4c0 R09: ffffc90000dcf4d0 R10: 0000000000000000 R11: 1ffff920001b9eba R12: 0000000000000201 R13: 1ffff11023829dc4 R14: 0000000000000000 R15: 0000000000000002 FS: 00007f2f9958b6c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f495ad80178 CR3: 000000012e399000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 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 05 f0 63 fd call 0xfd63f013 e: 48 89 d8 mov %rbx,%rax 11: bb d8 02 00 00 mov $0x2d8,%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 db ef 63 fd call 0xfd63f013 38: 48 8b 1b mov (%rbx),%rbx 3b: 48 85 db test %rbx,%rbx 3e: 0f .byte 0xf 3f: 84 .byte 0x84