general protection fault, probably for non-canonical address 0xdffffc0000000009: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000048-0x000000000000004f]
CPU: 1 PID: 11052 Comm: syz-executor.3 Not tainted 6.1.0-rc4-syzkaller-01033-gb548b17a93fd #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
RIP: 0010:udpv6_sendmsg+0xe7a/0x2c70 net/ipv6/udp.c:1433
Code: ff ff ff 48 83 c0 08 48 89 85 68 fd ff ff 48 8b 85 c0 fd ff ff 48 8d 78 4e 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 48 89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 d0 1b 00 00
RSP: 0018:ffffc9000324f208 EFLAGS: 00010207
RAX: dffffc0000000000 RBX: 000000000000001c RCX: ffffc90005aa1000
RDX: 0000000000000009 RSI: ffffffff88225844 RDI: 000000000000004e
RBP: ffffc9000324f4a8 R08: 0000000000000003 R09: 0000000000000000
R10: 000000000000214e R11: 0000000000000000 R12: ffff888078d51d00
R13: 000000000000214e R14: ffff888078d51d12 R15: ffffc9000324f538
FS:  00007f8e8ca9a700(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2e831000 CR3: 000000001cf0e000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 do_udp_sendmsg net/rxrpc/output.c:27 [inline]
 do_udp_sendmsg net/rxrpc/output.c:21 [inline]
 rxrpc_send_data_packet+0x1e02/0x24b0 net/rxrpc/output.c:485
 rxrpc_queue_packet net/rxrpc/sendmsg.c:264 [inline]
 rxrpc_send_data+0xc10/0x2870 net/rxrpc/sendmsg.c:411
 rxrpc_do_sendmsg+0xb2f/0x1200 net/rxrpc/sendmsg.c:733
 rxrpc_sendmsg+0x1c4/0x650 net/rxrpc/af_rxrpc.c:561
 sock_sendmsg_nosec net/socket.c:714 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:734
 ____sys_sendmsg+0x334/0x8c0 net/socket.c:2476
 ___sys_sendmsg+0x110/0x1b0 net/socket.c:2530
 __sys_sendmmsg+0x18b/0x460 net/socket.c:2616
 __do_sys_sendmmsg net/socket.c:2645 [inline]
 __se_sys_sendmmsg net/socket.c:2642 [inline]
 __x64_sys_sendmmsg+0x99/0x100 net/socket.c:2642
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f8e8bc8b639
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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f8e8ca9a168 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007f8e8bdabf80 RCX: 00007f8e8bc8b639
RDX: 040000000000028c RSI: 0000000020005c00 RDI: 0000000000000004
RBP: 00007f8e8bce67e1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc939e4e0f R14: 00007f8e8ca9a300 R15: 0000000000022000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess), 2 bytes skipped:
   0:	ff 48 83             	decl   -0x7d(%rax)
   3:	c0 08 48             	rorb   $0x48,(%rax)
   6:	89 85 68 fd ff ff    	mov    %eax,-0x298(%rbp)
   c:	48 8b 85 c0 fd ff ff 	mov    -0x240(%rbp),%rax
  13:	48 8d 78 4e          	lea    0x4e(%rax),%rdi
  17:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  1e:	fc ff df
  21:	48 89 fa             	mov    %rdi,%rdx
  24:	48 c1 ea 03          	shr    $0x3,%rdx
* 28:	0f b6 04 02          	movzbl (%rdx,%rax,1),%eax <-- trapping instruction
  2c:	48 89 fa             	mov    %rdi,%rdx
  2f:	83 e2 07             	and    $0x7,%edx
  32:	38 d0                	cmp    %dl,%al
  34:	7f 08                	jg     0x3e
  36:	84 c0                	test   %al,%al
  38:	0f 85 d0 1b 00 00    	jne    0x1c0e