BTRFS warning (device loop0): to be deleted qgroup 0/5 has non-zero numbers, data 0 meta prealloc 0 meta pertrans 8192
------------[ cut here ]------------
BTRFS: Transaction aborted (error -2)
WARNING: fs/btrfs/extent-tree.c:3105 at do_free_extent_accounting fs/btrfs/extent-tree.c:3105 [inline], CPU#0: syz.0.0/5324
WARNING: fs/btrfs/extent-tree.c:3105 at __btrfs_free_extent+0x3a28/0x4350 fs/btrfs/extent-tree.c:3474, CPU#0: syz.0.0/5324
Modules linked in:
CPU: 0 UID: 0 PID: 5324 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:do_free_extent_accounting fs/btrfs/extent-tree.c:3105 [inline]
RIP: 0010:__btrfs_free_extent+0x3a2b/0x4350 fs/btrfs/extent-tree.c:3474
Code: c0 05 00 00 e8 96 16 c4 fd 84 c0 0f 84 f3 00 00 00 e8 39 0d df fd e9 a9 05 00 00 e8 2f 0d df fd 48 8d 3d 58 15 34 0c 44 89 ee <67> 48 0f b9 3a e9 af e2 ff ff e8 16 0d df fd eb 05 e8 0f 0d df fd
RSP: 0018:ffffc9000e617400 EFLAGS: 00010283
RAX: ffffffff83e68f01 RBX: ffff888046defbf0 RCX: 0000000000100000
RDX: ffffc90020001000 RSI: 00000000fffffffe RDI: ffffffff901aa460
RBP: ffffc9000e6175b0 R08: ffff888037588000 R09: 0000000000000003
R10: 00000000fffffffb R11: 0000000000000002 R12: ffff888040638f20
R13: 00000000fffffffe R14: 0000000000000000 R15: ffff888041794001
FS:  00007fc4cbc7d6c0(0000) GS:ffff88808ca5b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc4caef59e0 CR3: 0000000023ee0000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 run_one_delayed_ref fs/btrfs/extent-tree.c:-1 [inline]
 btrfs_run_delayed_refs_for_head fs/btrfs/extent-tree.c:2003 [inline]
 __btrfs_run_delayed_refs+0x15e7/0x4240 fs/btrfs/extent-tree.c:2078
 btrfs_run_delayed_refs+0xe6/0x3b0 fs/btrfs/extent-tree.c:2190
 btrfs_commit_transaction+0xfb6/0x31a0 fs/btrfs/transaction.c:2457
 btrfs_ioctl_set_fslabel+0x375/0x4f0 fs/btrfs/ioctl.c:4050
 btrfs_ioctl+0x9f2/0xd00 fs/btrfs/ioctl.c:5121
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc4cad9c629
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fc4cbc7d028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fc4cb016090 RCX: 00007fc4cad9c629
RDX: 0000200000000140 RSI: 0000000041009432 RDI: 000000000000000c
RBP: 00007fc4cae32b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc4cb016128 R14: 00007fc4cb016090 R15: 00007ffddb1b3a48
 </TASK>
----------------
Code disassembly (best guess), 2 bytes skipped:
   0:	00 00                	add    %al,(%rax)
   2:	e8 96 16 c4 fd       	call   0xfdc4169d
   7:	84 c0                	test   %al,%al
   9:	0f 84 f3 00 00 00    	je     0x102
   f:	e8 39 0d df fd       	call   0xfddf0d4d
  14:	e9 a9 05 00 00       	jmp    0x5c2
  19:	e8 2f 0d df fd       	call   0xfddf0d4d
  1e:	48 8d 3d 58 15 34 0c 	lea    0xc341558(%rip),%rdi        # 0xc34157d
  25:	44 89 ee             	mov    %r13d,%esi
* 28:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2d:	e9 af e2 ff ff       	jmp    0xffffe2e1
  32:	e8 16 0d df fd       	call   0xfddf0d4d
  37:	eb 05                	jmp    0x3e
  39:	e8 0f 0d df fd       	call   0xfddf0d4d