Oops: general protection fault, probably for non-canonical address 0xdffffc0000000018: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x00000000000000c0-0x00000000000000c7] CPU: 0 UID: 0 PID: 14733 Comm: syz.2.2405 Not tainted 6.15.0-rc4-syzkaller-00189-g2bfcee565c3a #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+0x136/0x15d0 net/ipv6/route.c:781 Code: 48 c1 ea 03 80 3c 02 00 0f 85 ac 11 00 00 48 b8 00 00 00 00 00 fc ff df 4d 8b 7d 00 49 8d bf c0 00 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 93 11 00 00 4d 8b bf c0 00 00 00 e8 84 12 50 01 RSP: 0018:ffffc9000b986ba0 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: 0000000000000002 RCX: ffffc9000bda9000 RDX: 0000000000000018 RSI: ffffffff8a1c83bf RDI: 00000000000000c0 RBP: ffffc9000b986ca8 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff888141b36737 R13: ffff888141b36720 R14: 1ffff92001730d83 R15: 0000000000000000 FS: 00007fb84a7d16c0(0000) GS:ffff8881249e1000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00002000000084c0 CR3: 000000002b15d000 CR4: 00000000003526f0 DR0: 0000000000000007 DR1: 0000000000000002 DR2: 0000000000000008 DR3: 1000000100000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rt6_nh_find_match+0xfa/0x1a0 net/ipv6/route.c:821 nexthop_for_each_fib6_nh+0x165/0x4a0 net/ipv4/nexthop.c:1515 __find_rr_leaf+0x6e5/0xe00 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+0x57c/0xa30 net/ipv6/route.c:2230 ip6_pol_route+0x1cc/0x1230 net/ipv6/route.c:2266 pol_lookup_func include/net/ip6_fib.h:616 [inline] fib6_rule_lookup+0x386/0x720 net/ipv6/fib6_rules.c:125 ip6_route_output_flags_noref net/ipv6/route.c:2674 [inline] ip6_route_output_flags+0x1d0/0x640 net/ipv6/route.c:2686 ip6_route_output include/net/ip6_route.h:93 [inline] ip6_dst_lookup_tail.constprop.0+0xa52/0x2140 net/ipv6/ip6_output.c:1128 ip6_dst_lookup_flow+0x99/0x1d0 net/ipv6/ip6_output.c:1259 sctp_v6_get_dst+0x6a2/0x2050 net/sctp/ipv6.c:326 sctp_transport_route+0x12f/0x350 net/sctp/transport.c:457 sctp_assoc_add_peer+0x741/0x1550 net/sctp/associola.c:663 sctp_connect_new_asoc+0x208/0x790 net/sctp/socket.c:1100 sctp_sendmsg_new_asoc net/sctp/socket.c:1694 [inline] sctp_sendmsg+0x15f9/0x1ee0 net/sctp/socket.c:2005 inet_sendmsg+0x119/0x140 net/ipv4/af_inet.c:851 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg net/socket.c:727 [inline] ____sys_sendmsg+0x973/0xc70 net/socket.c:2566 ___sys_sendmsg+0x134/0x1d0 net/socket.c:2620 __sys_sendmmsg+0x200/0x420 net/socket.c:2709 __do_sys_sendmmsg net/socket.c:2736 [inline] __se_sys_sendmmsg net/socket.c:2733 [inline] __x64_sys_sendmmsg+0x9c/0x100 net/socket.c:2733 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fb84998e969 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:00007fb84a7d1038 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 00007fb849bb5fa0 RCX: 00007fb84998e969 RDX: 0000000000000002 RSI: 0000200000000bc0 RDI: 0000000000000005 RBP: 00007fb849a10ab1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000024040040 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fb849bb5fa0 R15: 00007ffd5a7c0988 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+0x136/0x15d0 net/ipv6/route.c:781 Code: 48 c1 ea 03 80 3c 02 00 0f 85 ac 11 00 00 48 b8 00 00 00 00 00 fc ff df 4d 8b 7d 00 49 8d bf c0 00 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 93 11 00 00 4d 8b bf c0 00 00 00 e8 84 12 50 01 RSP: 0018:ffffc9000b986ba0 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: 0000000000000002 RCX: ffffc9000bda9000 RDX: 0000000000000018 RSI: ffffffff8a1c83bf RDI: 00000000000000c0 RBP: ffffc9000b986ca8 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff888141b36737 R13: ffff888141b36720 R14: 1ffff92001730d83 R15: 0000000000000000 FS: 00007fb84a7d16c0(0000) GS:ffff888124ae1000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c44d6dc CR3: 000000002b15d000 CR4: 00000000003526f0 DR0: 0000000000000007 DR1: 0000000000000002 DR2: 0000000000000008 DR3: 1000000100000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 48 c1 ea 03 shr $0x3,%rdx 4: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) 8: 0f 85 ac 11 00 00 jne 0x11ba e: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 15: fc ff df 18: 4d 8b 7d 00 mov 0x0(%r13),%r15 1c: 49 8d bf c0 00 00 00 lea 0xc0(%r15),%rdi 23: 48 89 fa mov %rdi,%rdx 26: 48 c1 ea 03 shr $0x3,%rdx * 2a: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction 2e: 0f 85 93 11 00 00 jne 0x11c7 34: 4d 8b bf c0 00 00 00 mov 0xc0(%r15),%r15 3b: e8 84 12 50 01 call 0x15012c4