Oops: general protection fault, probably for non-canonical address 0xdffffc0000000018: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x00000000000000c0-0x00000000000000c7] CPU: 0 UID: 0 PID: 14813 Comm: syz.1.2572 Not tainted 6.15.0-rc3-syzkaller-00032-ga79be02bba5c #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 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+0xae/0xc10 net/ipv6/route.c:781 Code: 08 48 89 df e8 03 1f 69 f7 4c 89 64 24 40 48 89 d8 bb c0 00 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 d4 1e 69 f7 4c 8b 23 e8 bc 81 66 01 RSP: 0018:ffffc90003656ca0 EFLAGS: 00010206 RAX: 0000000000000018 RBX: 00000000000000c0 RCX: dffffc0000000000 RDX: ffff88802c0c8000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffff88803045c520 R08: ffffffff8ac1460f R09: ffffc90003657070 R10: ffffc90003656ea0 R11: ffffffff8ac14450 R12: ffffc90003657070 R13: ffff88803045c537 R14: 1ffff1100608b8a6 R15: 1ffff1100608b8a4 FS: 00007fd55fa6c6c0(0000) GS:ffff888124fcf000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c3065a4 CR3: 0000000032082000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 000000000000000e DR6: 00000000ffff0ff0 DR7: 0000000000000400 Call Trace: rt6_nh_find_match+0xde/0x150 net/ipv6/route.c:821 nexthop_for_each_fib6_nh+0x1d0/0x410 net/ipv4/nexthop.c:1515 __find_rr_leaf+0x596/0x8f0 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+0x410/0xbf0 net/ipv6/route.c:2230 ip6_pol_route+0x26d/0x15f0 net/ipv6/route.c:2266 pol_lookup_func include/net/ip6_fib.h:616 [inline] fib6_rule_lookup+0x3c4/0x7a0 net/ipv6/fib6_rules.c:125 ip6_route_output_flags_noref net/ipv6/route.c:2674 [inline] ip6_route_output_flags+0x38e/0x610 net/ipv6/route.c:2686 ip6_route_output include/net/ip6_route.h:93 [inline] ip6_dst_lookup_tail+0x1b5/0x1510 net/ipv6/ip6_output.c:1128 ip6_dst_lookup_flow+0xbb/0x180 net/ipv6/ip6_output.c:1259 sctp_v6_get_dst+0x7a8/0x1e30 net/sctp/ipv6.c:326 sctp_transport_route+0x12c/0x2e0 net/sctp/transport.c:457 sctp_assoc_add_peer+0x611/0x1360 net/sctp/associola.c:663 sctp_connect_new_asoc+0x361/0x700 net/sctp/socket.c:1100 sctp_sendmsg_new_asoc net/sctp/socket.c:1694 [inline] sctp_sendmsg+0x2009/0x3620 net/sctp/socket.c:2005 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg+0x1a6/0x270 net/socket.c:727 __sys_sendto+0x365/0x4c0 net/socket.c:2180 __do_sys_sendto net/socket.c:2187 [inline] __se_sys_sendto net/socket.c:2183 [inline] __x64_sys_sendto+0xde/0x100 net/socket.c:2183 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf3/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fd55eb8e969 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:00007fd55fa6c038 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007fd55edb5fa0 RCX: 00007fd55eb8e969 RDX: 000000000000fee4 RSI: 0000200000847fff RDI: 0000000000000003 RBP: 00007fd55ec10ab1 R08: 000020000005ffe4 R09: 000000000000001c R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fd55edb5fa0 R15: 00007ffe78d73668 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+0xae/0xc10 net/ipv6/route.c:781 Code: 08 48 89 df e8 03 1f 69 f7 4c 89 64 24 40 48 89 d8 bb c0 00 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 d4 1e 69 f7 4c 8b 23 e8 bc 81 66 01 RSP: 0018:ffffc90003656ca0 EFLAGS: 00010206 RAX: 0000000000000018 RBX: 00000000000000c0 RCX: dffffc0000000000 RDX: ffff88802c0c8000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffff88803045c520 R08: ffffffff8ac1460f R09: ffffc90003657070 R10: ffffc90003656ea0 R11: ffffffff8ac14450 R12: ffffc90003657070 R13: ffff88803045c537 R14: 1ffff1100608b8a6 R15: 1ffff1100608b8a4 FS: 00007fd55fa6c6c0(0000) GS:ffff888124fcf000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00002000001ab000 CR3: 0000000032082000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 000000000000000e DR6: 00000000ffff0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 08 48 89 or %cl,-0x77(%rax) 3: df e8 fucomip %st(0),%st 5: 03 1f add (%rdi),%ebx 7: 69 f7 4c 89 64 24 imul $0x2464894c,%edi,%esi d: 40 rex e: 48 89 d8 mov %rbx,%rax 11: bb c0 00 00 00 mov $0xc0,%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 d4 1e 69 f7 call 0xf7691f0c 38: 4c 8b 23 mov (%rbx),%r12 3b: e8 bc 81 66 01 call 0x16681fc