BTRFS info (device loop0): using free space tree
BTRFS info (device loop0): enabling ssd optimizations
BTRFS info (device loop0): auto enabling async discard
BTRFS info (device loop0): checking UUID tree
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: 4169 Comm: syz-executor.0 Not tainted 6.1.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
RIP: 0010:empty_backref_cache fs/btrfs/send.c:1384 [inline]
RIP: 0010:btrfs_ioctl_send+0x11ff/0x5950 fs/btrfs/send.c:8317
Code: 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 a8 18 00 00 48 8b bd c0 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 93 18 00 00 49 bd 00 00 00 00 00 fc ff df 49 39
RSP: 0018:ffffc90004cef8d8 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffff88807a8b2940 RCX: 0000000000000001
RDX: 0000000000000000 RSI: ffffffff896b7fc0 RDI: 0000000000000000
RBP: ffff88807a8b2800 R08: 0000000000000000 R09: ffff88807db346ab
R10: ffffed100fb668d5 R11: 0000000000000000 R12: ffff88807a8b29c0
R13: ffffed100f516528 R14: 1ffff1100f516532 R15: ffff88807a8b2998
FS:  00007fdc2ae16700(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fdc2a0db228 CR3: 0000000072a95000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 _btrfs_ioctl_send+0x1ee/0x280 fs/btrfs/ioctl.c:4343
 btrfs_ioctl+0x2df1/0x5650 fs/btrfs/ioctl.c:4634
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl fs/ioctl.c:856 [inline]
 __x64_sys_ioctl+0x123/0x190 fs/ioctl.c:856
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fdc2a08c0d9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 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:00007fdc2ae16168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fdc2a1abf80 RCX: 00007fdc2a08c0d9
RDX: 0000000020000040 RSI: 0000000040489426 RDI: 0000000000000003
RBP: 00007fdc2a0e7ae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fffde71751f R14: 00007fdc2ae16300 R15: 0000000000022000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:empty_backref_cache fs/btrfs/send.c:1384 [inline]
RIP: 0010:btrfs_ioctl_send+0x11ff/0x5950 fs/btrfs/send.c:8317
Code: 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 a8 18 00 00 48 8b bd c0 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 93 18 00 00 49 bd 00 00 00 00 00 fc ff df 49 39
RSP: 0018:ffffc90004cef8d8 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffff88807a8b2940 RCX: 0000000000000001
RDX: 0000000000000000 RSI: ffffffff896b7fc0 RDI: 0000000000000000
RBP: ffff88807a8b2800 R08: 0000000000000000 R09: ffff88807db346ab
R10: ffffed100fb668d5 R11: 0000000000000000 R12: ffff88807a8b29c0
R13: ffffed100f516528 R14: 1ffff1100f516532 R15: ffff88807a8b2998
FS:  00007fdc2ae16700(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000557e14f03120 CR3: 0000000072a95000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess), 4 bytes skipped:
   0:	48 c1 ea 03          	shr    $0x3,%rdx
   4:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1)
   8:	0f 85 a8 18 00 00    	jne    0x18b6
   e:	48 8b bd c0 01 00 00 	mov    0x1c0(%rbp),%rdi
  15:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  1c:	fc ff df
  1f:	48 89 fa             	mov    %rdi,%rdx
  22:	48 c1 ea 03          	shr    $0x3,%rdx
* 26:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1) <-- trapping instruction
  2a:	0f 85 93 18 00 00    	jne    0x18c3
  30:	49 bd 00 00 00 00 00 	movabs $0xdffffc0000000000,%r13
  37:	fc ff df
  3a:	49                   	rex.WB
  3b:	39                   	.byte 0x39