general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 1 PID: 3644 Comm: kworker/u5:3 Not tainted 6.1.0-rc3-syzkaller-00887-g0c9ef08a4d0f #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Workqueue: krxrpcd rxrpc_peer_keepalive_worker
RIP: 0010:ipv6_addr_v4mapped include/net/ipv6.h:749 [inline]
RIP: 0010:udpv6_sendmsg+0xd0a/0x2c70 net/ipv6/udp.c:1361
Code: 48 8b 85 98 fd ff ff 48 85 c0 0f 85 2a f8 ff ff e8 5b 46 5a f9 48 8b 95 c0 fd ff ff 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 0f 85 40 1e 00 00 48 8b 85 c0 fd ff ff 48 8d 78 08 48
RSP: 0018:ffffc90003f5f7d8 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: 000000000000001c RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff88226bc5 RDI: 0000000000000007
RBP: ffffc90003f5fa78 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff888020e26cc0
R13: ffff88806dcde93c R14: ffff888020e26cd2 R15: ffffc90003f5fb00
FS:  0000000000000000(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2eb21000 CR3: 000000005131e000 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_keepalive+0x3db/0x470 net/rxrpc/output.c:703
 rxrpc_peer_keepalive_dispatch net/rxrpc/peer_event.c:327 [inline]
 rxrpc_peer_keepalive_worker+0x7cd/0xc10 net/rxrpc/peer_event.c:391
 process_one_work+0x9bf/0x1710 kernel/workqueue.c:2289
 worker_thread+0x665/0x1080 kernel/workqueue.c:2436
 kthread+0x2e4/0x3a0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ipv6_addr_v4mapped include/net/ipv6.h:749 [inline]
RIP: 0010:udpv6_sendmsg+0xd0a/0x2c70 net/ipv6/udp.c:1361
Code: 48 8b 85 98 fd ff ff 48 85 c0 0f 85 2a f8 ff ff e8 5b 46 5a f9 48 8b 95 c0 fd ff ff 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 0f 85 40 1e 00 00 48 8b 85 c0 fd ff ff 48 8d 78 08 48
RSP: 0018:ffffc90003f5f7d8 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: 000000000000001c RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff88226bc5 RDI: 0000000000000007
RBP: ffffc90003f5fa78 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff888020e26cc0
R13: ffff88806dcde93c R14: ffff888020e26cd2 R15: ffffc90003f5fb00
FS:  0000000000000000(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2eb21000 CR3: 000000000bc8e000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	48 8b 85 98 fd ff ff 	mov    -0x268(%rbp),%rax
   7:	48 85 c0             	test   %rax,%rax
   a:	0f 85 2a f8 ff ff    	jne    0xfffff83a
  10:	e8 5b 46 5a f9       	callq  0xf95a4670
  15:	48 8b 95 c0 fd ff ff 	mov    -0x240(%rbp),%rdx
  1c:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  23:	fc ff df
  26:	48 c1 ea 03          	shr    $0x3,%rdx
* 2a:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1) <-- trapping instruction
  2e:	0f 85 40 1e 00 00    	jne    0x1e74
  34:	48 8b 85 c0 fd ff ff 	mov    -0x240(%rbp),%rax
  3b:	48 8d 78 08          	lea    0x8(%rax),%rdi
  3f:	48                   	rex.W