Oops: general protection fault, probably for non-canonical address 0xdffffc0000000007: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000038-0x000000000000003f]
CPU: 0 UID: 0 PID: 8828 Comm: syz.2.10548 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
RIP: 0010:rt_cache_valid net/ipv4/route.c:1582 [inline]
RIP: 0010:__mkroute_output net/ipv4/route.c:2650 [inline]
RIP: 0010:ip_route_output_key_hash_rcu+0x12ba/0x25d0 net/ipv4/route.c:2875
Code: c3 31 ff 89 c6 e8 26 0b ce f7 85 db 74 5b e8 dd 06 ce f7 eb 05 e8 d6 06 ce f7 4d 85 ff 74 36 49 8d 5f 3a 48 89 d8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 ff 10 00 00 0f b7 1b bf ff ff 00 00 89
RSP: 0018:ffffc900051e75e0 EFLAGS: 00010202
RAX: 0000000000000007 RBX: 0000000000000039 RCX: 0000000000080000
RDX: ffffc90010765000 RSI: 0000000000002361 RDI: 0000000000002362
RBP: 0000000080000000 R08: ffff88802d550000 R09: 0000000000000003
R10: 0000000000000005 R11: 0000000000000002 R12: dffffc0000000000
R13: 0000000000000000 R14: ffff88803a9bd658 R15: ffffffffffffffff
FS:  0000000000000000(0000) GS:ffff8881256f3000(0063) knlGS:00000000f5464b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 000000000c35740e CR3: 000000007d2e8000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 000000000000000e DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 ip_route_output_key_hash+0x18d/0x2a0 net/ipv4/route.c:2705
 __ip_route_output_key include/net/route.h:169 [inline]
 ip_route_output_flow+0x2a/0x150 net/ipv4/route.c:2932
 ip_route_output_key include/net/route.h:179 [inline]
 sctp_v4_get_dst+0x3f8/0x12b0 net/sctp/protocol.c:455
 sctp_transport_route+0x118/0x2f0 net/sctp/transport.c:448
 sctp_assoc_add_peer+0x650/0x13b0 net/sctp/associola.c:663
 sctp_connect_add_peer+0x1a0/0x210 net/sctp/socket.c:1155
 __sctp_connect+0x79c/0xdc0 net/sctp/socket.c:1218
 sctp_getsockopt_connectx3+0x227/0x360 net/sctp/socket.c:1422
 sctp_getsockopt+0x984/0xb90 net/sctp/socket.c:8174
 do_sock_getsockopt+0x2d3/0x3f0 net/socket.c:2383
 __sys_getsockopt net/socket.c:2412 [inline]
 __do_sys_getsockopt net/socket.c:2419 [inline]
 __se_sys_getsockopt net/socket.c:2416 [inline]
 __ia32_sys_getsockopt+0x1a4/0x240 net/socket.c:2416
 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
 __do_fast_syscall_32+0x1d2/0x540 arch/x86/entry/syscall_32.c:307
 do_fast_syscall_32+0x33/0x70 arch/x86/entry/syscall_32.c:332
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf7fe4539
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:00000000f546450c EFLAGS: 00000206 ORIG_RAX: 000000000000016d
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000000084
RDX: 000000000000006f RSI: 00000000800000c0 RDI: 0000000080000100
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:rt_cache_valid net/ipv4/route.c:1582 [inline]
RIP: 0010:__mkroute_output net/ipv4/route.c:2650 [inline]
RIP: 0010:ip_route_output_key_hash_rcu+0x12ba/0x25d0 net/ipv4/route.c:2875
Code: c3 31 ff 89 c6 e8 26 0b ce f7 85 db 74 5b e8 dd 06 ce f7 eb 05 e8 d6 06 ce f7 4d 85 ff 74 36 49 8d 5f 3a 48 89 d8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 ff 10 00 00 0f b7 1b bf ff ff 00 00 89
RSP: 0018:ffffc900051e75e0 EFLAGS: 00010202
RAX: 0000000000000007 RBX: 0000000000000039 RCX: 0000000000080000
RDX: ffffc90010765000 RSI: 0000000000002361 RDI: 0000000000002362
RBP: 0000000080000000 R08: ffff88802d550000 R09: 0000000000000003
R10: 0000000000000005 R11: 0000000000000002 R12: dffffc0000000000
R13: 0000000000000000 R14: ffff88803a9bd658 R15: ffffffffffffffff
FS:  0000000000000000(0000) GS:ffff8881256f3000(0063) knlGS:00000000f5464b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00000000800eb000 CR3: 000000007d2e8000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 000000000000000e DR6: 00000000ffff0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	c3                   	ret
   1:	31 ff                	xor    %edi,%edi
   3:	89 c6                	mov    %eax,%esi
   5:	e8 26 0b ce f7       	call   0xf7ce0b30
   a:	85 db                	test   %ebx,%ebx
   c:	74 5b                	je     0x69
   e:	e8 dd 06 ce f7       	call   0xf7ce06f0
  13:	eb 05                	jmp    0x1a
  15:	e8 d6 06 ce f7       	call   0xf7ce06f0
  1a:	4d 85 ff             	test   %r15,%r15
  1d:	74 36                	je     0x55
  1f:	49 8d 5f 3a          	lea    0x3a(%r15),%rbx
  23:	48 89 d8             	mov    %rbx,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 0f b6 04 20       	movzbl (%rax,%r12,1),%eax <-- trapping instruction
  2f:	84 c0                	test   %al,%al
  31:	0f 85 ff 10 00 00    	jne    0x1136
  37:	0f b7 1b             	movzwl (%rbx),%ebx
  3a:	bf ff ff 00 00       	mov    $0xffff,%edi
  3f:	89                   	.byte 0x89