Oops: general protection fault, probably for non-canonical address 0xdffffc0000000018: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x00000000000000c0-0x00000000000000c7] CPU: 1 UID: 0 PID: 14674 Comm: syz.5.1996 Not tainted 6.15.0-rc3-syzkaller-00342-g5bc1018675ec #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025 RIP: 0010:__in6_dev_get include/net/addrconf.h:347 [inline] RIP: 0010:ip6_ignore_linkdown include/net/addrconf.h:443 [inline] RIP: 0010:find_match+0xa3/0xc90 net/ipv6/route.c:781 Code: 00 00 00 00 00 fc ff df 42 80 7c 25 00 00 74 08 48 89 df e8 4f 02 18 f8 48 89 d8 bb c0 00 00 00 48 03 18 48 89 d8 48 c1 e8 03 <42> 80 3c 20 00 74 08 48 89 df e8 2e 02 18 f8 48 8b 1b e8 36 13 47 RSP: 0018:ffffc90004a2f250 EFLAGS: 00010206 RAX: 0000000000000018 RBX: 00000000000000c0 RCX: 0000000000000002 RDX: ffff88802b729e00 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 1ffff11004c18e64 R08: ffffc90004a2f5e0 R09: ffffc90004a2f5f0 R10: ffffc90004a2f440 R11: ffffffff8a078900 R12: dffffc0000000000 R13: 0000000000000003 R14: 1ffff11004c18e66 R15: ffff8880260c7337 FS: 00007fad9ddb46c0(0000) GS:ffff888126202000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b33b1aff8 CR3: 000000004b762000 CR4: 00000000003526f0 DR0: 0000000000000007 DR1: 0000000000000002 DR2: 0000000000000008 DR3: 1000000100000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rt6_nh_find_match+0xd9/0x150 net/ipv6/route.c:821 nexthop_for_each_fib6_nh+0x1c6/0x400 net/ipv4/nexthop.c:1515 __find_rr_leaf+0x461/0x6d0 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+0x39f/0xa80 net/ipv6/route.c:2230 ip6_pol_route+0x222/0x1180 net/ipv6/route.c:2266 pol_lookup_func include/net/ip6_fib.h:616 [inline] fib6_rule_lookup+0x348/0x6f0 net/ipv6/fib6_rules.c:125 ip6_route_output_flags_noref net/ipv6/route.c:2674 [inline] ip6_route_output_flags+0x364/0x5d0 net/ipv6/route.c:2686 ip6_route_output include/net/ip6_route.h:93 [inline] ip6_dst_lookup_tail+0x1ae/0x1500 net/ipv6/ip6_output.c:1128 ip6_dst_lookup_flow+0x47/0xe0 net/ipv6/ip6_output.c:1259 ip6_datagram_dst_update+0x758/0xcb0 net/ipv6/datagram.c:96 __ip6_datagram_connect+0xbd1/0x1150 net/ipv6/datagram.c:255 l2tp_ip6_connect+0x17c/0x450 net/l2tp/l2tp_ip6.c:420 __sys_connect_file net/socket.c:2038 [inline] __sys_connect+0x313/0x440 net/socket.c:2057 __do_sys_connect net/socket.c:2063 [inline] __se_sys_connect net/socket.c:2060 [inline] __x64_sys_connect+0x7a/0x90 net/socket.c:2060 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fad9ff8e969 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:00007fad9ddb4038 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: ffffffffffffffda RBX: 00007fada01b6160 RCX: 00007fad9ff8e969 RDX: 0000000000000020 RSI: 0000200000000f40 RDI: 0000000000000005 RBP: 00007fada0010ab1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fada01b6160 R15: 00007ffe902d6b08 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__in6_dev_get include/net/addrconf.h:347 [inline] RIP: 0010:ip6_ignore_linkdown include/net/addrconf.h:443 [inline] RIP: 0010:find_match+0xa3/0xc90 net/ipv6/route.c:781 Code: 00 00 00 00 00 fc ff df 42 80 7c 25 00 00 74 08 48 89 df e8 4f 02 18 f8 48 89 d8 bb c0 00 00 00 48 03 18 48 89 d8 48 c1 e8 03 <42> 80 3c 20 00 74 08 48 89 df e8 2e 02 18 f8 48 8b 1b e8 36 13 47 RSP: 0018:ffffc90004a2f250 EFLAGS: 00010206 RAX: 0000000000000018 RBX: 00000000000000c0 RCX: 0000000000000002 RDX: ffff88802b729e00 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 1ffff11004c18e64 R08: ffffc90004a2f5e0 R09: ffffc90004a2f5f0 R10: ffffc90004a2f440 R11: ffffffff8a078900 R12: dffffc0000000000 R13: 0000000000000003 R14: 1ffff11004c18e66 R15: ffff8880260c7337 FS: 00007fad9ddb46c0(0000) GS:ffff888126202000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fad9d991d58 CR3: 000000004b762000 CR4: 00000000003526f0 DR0: 0000000000000007 DR1: 0000000000000002 DR2: 0000000000000008 DR3: 1000000100000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess), 7 bytes skipped: 0: df 42 80 filds -0x80(%rdx) 3: 7c 25 jl 0x2a 5: 00 00 add %al,(%rax) 7: 74 08 je 0x11 9: 48 89 df mov %rbx,%rdi c: e8 4f 02 18 f8 call 0xf8180260 11: 48 89 d8 mov %rbx,%rax 14: bb c0 00 00 00 mov $0xc0,%ebx 19: 48 03 18 add (%rax),%rbx 1c: 48 89 d8 mov %rbx,%rax 1f: 48 c1 e8 03 shr $0x3,%rax * 23: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) <-- trapping instruction 28: 74 08 je 0x32 2a: 48 89 df mov %rbx,%rdi 2d: e8 2e 02 18 f8 call 0xf8180260 32: 48 8b 1b mov (%rbx),%rbx 35: e8 .byte 0xe8 36: 36 ss 37: 13 .byte 0x13 38: 47 rex.RXB