BTRFS warning (device loop0): to be deleted qgroup 0/5 has non-zero numbers, data 1294336 meta prealloc 36864 meta pertrans 53248
BTRFS error (device loop0): failed to run delayed ref for logical 5259264 num_bytes 8192 type 178 action 1 ref_mod 1: -2
------------[ cut here ]------------
BTRFS: Transaction aborted (error -2)
WARNING: fs/btrfs/extent-tree.c:2192 at btrfs_run_delayed_refs+0x30b/0x3b0 fs/btrfs/extent-tree.c:2192, CPU#0: syz.0.0/5329
Modules linked in:
CPU: 0 UID: 0 PID: 5329 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:btrfs_run_delayed_refs+0x30e/0x3b0 fs/btrfs/extent-tree.c:2192
Code: 85 e4 75 07 e8 63 b2 e0 fd eb 7a e8 ac b6 c5 fd 84 c0 74 20 e8 53 b2 e0 fd eb 6a e8 4c b2 e0 fd 48 8d 3d 25 c0 35 0c 44 89 fe <67> 48 0f b9 3a e9 0b ff ff ff e8 e3 ec ca 07 41 89 c4 31 ff 89 c6
RSP: 0018:ffffc9000f8df658 EFLAGS: 00010287
RAX: ffffffff83e4fb04 RBX: ffff888047a8f000 RCX: 0000000000100000
RDX: ffffc90020001000 RSI: 00000000fffffffe RDI: ffffffff901abb30
RBP: 0000000000000000 R08: ffff888036f58000 R09: 0000000000000003
R10: 00000000fffffffb R11: 0000000000000002 R12: ffff888037090001
R13: ffff88801221c000 R14: dffffc0000000000 R15: 00000000fffffffe
FS:  00007f95f21f56c0(0000) GS:ffff88808ca58000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000000c5000 CR3: 00000000348ce000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 btrfs_commit_transaction+0x29a/0x31a0 fs/btrfs/transaction.c:2238
 btrfs_sync_file+0xdee/0x1260 fs/btrfs/file.c:1817
 generic_write_sync include/linux/fs.h:2640 [inline]
 btrfs_do_write_iter+0x72e/0x880 fs/btrfs/file.c:1468
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x61d/0xb90 fs/read_write.c:688
 ksys_write+0x150/0x270 fs/read_write.c:740
 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: 0033:0x7f95f5d9c799
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:00007f95f21f4fe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f95f6016090 RCX: 00007f95f5d9c799
RDX: 000000000000000e RSI: 0000200000000080 RDI: 000000000000000b
RBP: 00007f95f5e32c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f95f6016128 R14: 00007f95f6016090 R15: 00007ffd7ee8dab8
 </TASK>
----------------
Code disassembly (best guess):
   0:	85 e4                	test   %esp,%esp
   2:	75 07                	jne    0xb
   4:	e8 63 b2 e0 fd       	call   0xfde0b26c
   9:	eb 7a                	jmp    0x85
   b:	e8 ac b6 c5 fd       	call   0xfdc5b6bc
  10:	84 c0                	test   %al,%al
  12:	74 20                	je     0x34
  14:	e8 53 b2 e0 fd       	call   0xfde0b26c
  19:	eb 6a                	jmp    0x85
  1b:	e8 4c b2 e0 fd       	call   0xfde0b26c
  20:	48 8d 3d 25 c0 35 0c 	lea    0xc35c025(%rip),%rdi        # 0xc35c04c
  27:	44 89 fe             	mov    %r15d,%esi
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	e9 0b ff ff ff       	jmp    0xffffff3f
  34:	e8 e3 ec ca 07       	call   0x7caed1c
  39:	41 89 c4             	mov    %eax,%r12d
  3c:	31 ff                	xor    %edi,%edi
  3e:	89 c6                	mov    %eax,%esi