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: 29337 Comm: syz.6.6019 Not tainted 6.15.0-rc6-syzkaller-00052-g9f35e33144ae #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 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 5f b4 12 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 3e b4 12 f8 48 8b 1b e8 e6 17 47 RSP: 0018:ffffc90004e26e50 EFLAGS: 00010206 RAX: 0000000000000018 RBX: 00000000000000c0 RCX: 0000000000000002 RDX: ffff8880338e8000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 1ffff1100db136a4 R08: ffffc90004e271e0 R09: ffffc90004e271f0 R10: ffffc90004e27040 R11: ffffffff8a0f3450 R12: dffffc0000000000 R13: 0000000000000003 R14: 1ffff1100db136a6 R15: ffff88806d89b537 FS: 0000000000000000(0000) GS:ffff8881260c7000(0063) knlGS:00000000f5024b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 000000008005ffe4 CR3: 00000000121fe000 CR4: 00000000003526f0 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 sctp_v6_get_dst+0x7cc/0x1bc0 net/sctp/ipv6.c:326 sctp_transport_route+0x118/0x2f0 net/sctp/transport.c:457 sctp_assoc_add_peer+0x657/0x13b0 net/sctp/associola.c:663 sctp_connect_new_asoc+0x30a/0x690 net/sctp/socket.c:1100 sctp_sendmsg_new_asoc net/sctp/socket.c:1694 [inline] sctp_sendmsg+0x155c/0x2810 net/sctp/socket.c:2005 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg+0x19c/0x270 net/socket.c:727 __sys_sendto+0x3bd/0x520 net/socket.c:2180 __do_sys_sendto net/socket.c:2187 [inline] __se_sys_sendto net/socket.c:2183 [inline] __ia32_sys_sendto+0xdd/0x100 net/socket.c:2183 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline] __do_fast_syscall_32+0xb4/0x110 arch/x86/entry/syscall_32.c:306 do_fast_syscall_32+0x34/0x80 arch/x86/entry/syscall_32.c:331 entry_SYSENTER_compat_after_hwframe+0x84/0x8e RIP: 0023:0xf7f44539 Code: 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 RSP: 002b:00000000f502455c EFLAGS: 00000206 ORIG_RAX: 0000000000000171 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000080847fff RDX: 0000000000034000 RSI: 0000000000000000 RDI: 000000008005ffe4 RBP: 000000000000001c R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 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 5f b4 12 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 3e b4 12 f8 48 8b 1b e8 e6 17 47 RSP: 0018:ffffc90004e26e50 EFLAGS: 00010206 RAX: 0000000000000018 RBX: 00000000000000c0 RCX: 0000000000000002 RDX: ffff8880338e8000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 1ffff1100db136a4 R08: ffffc90004e271e0 R09: ffffc90004e271f0 R10: ffffc90004e27040 R11: ffffffff8a0f3450 R12: dffffc0000000000 R13: 0000000000000003 R14: 1ffff1100db136a6 R15: ffff88806d89b537 FS: 0000000000000000(0000) GS:ffff8881260c7000(0063) knlGS:00000000f5024b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 0000000080140018 CR3: 00000000121fe000 CR4: 00000000003526f0 ---------------- 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 5f b4 12 f8 call 0xf812b470 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 3e b4 12 f8 call 0xf812b470 32: 48 8b 1b mov (%rbx),%rbx 35: e8 .byte 0xe8 36: e6 17 out %al,$0x17 38: 47 rex.RXB