------------[ cut here ]------------
BTRFS: Transaction aborted (error -28)
WARNING: fs/btrfs/block-group.c:4175 at do_chunk_alloc fs/btrfs/block-group.c:4175 [inline], CPU#0: kworker/u4:4/51
WARNING: fs/btrfs/block-group.c:4175 at btrfs_chunk_alloc+0x101d/0x15e0 fs/btrfs/block-group.c:4416, CPU#0: kworker/u4:4/51
Modules linked in:
CPU: 0 UID: 0 PID: 51 Comm: kworker/u4:4 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
Workqueue: events_unbound btrfs_async_reclaim_data_space
RIP: 0010:do_chunk_alloc fs/btrfs/block-group.c:4175 [inline]
RIP: 0010:btrfs_chunk_alloc+0x101f/0x15e0 fs/btrfs/block-group.c:4416
Code: 57 01 ae fd e9 6d 01 00 00 e8 1d 0b 93 fd 84 c0 74 22 e8 44 01 ae fd e9 5a 01 00 00 e8 3a 01 ae fd 48 8d 3d 23 e5 22 0c 89 de <67> 48 0f b9 3a e9 b3 fc ff ff e8 82 57 93 07 41 89 c6 31 ff 89 c6
RSP: 0018:ffffc90000acf790 EFLAGS: 00010293
RAX: ffffffff8417d2f6 RBX: ffffffffffffffe4 RCX: ffff88801cf44a00
RDX: 0000000000000000 RSI: 00000000ffffffe4 RDI: ffffffff903ab820
RBP: 0000000000000000 R08: ffff88801cf44a00 R09: 0000000000000003
R10: 00000000fffffffb R11: 0000000000000000 R12: 1ffff11008615116
R13: ffff888013346060 R14: ffff888042ce0001 R15: ffff888042d68800
FS:  0000000000000000(0000) GS:ffff88808c87e000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f38aa7f5008 CR3: 0000000012fc4000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 flush_space+0x3fb/0xe20 fs/btrfs/space-info.c:908
 do_async_reclaim_data_space+0x145/0x520 fs/btrfs/space-info.c:1448
 btrfs_async_reclaim_data_space+0x41/0x90 fs/btrfs/space-info.c:1512
 process_one_work kernel/workqueue.c:3314 [inline]
 process_scheduled_works+0xb5d/0x1860 kernel/workqueue.c:3397
 worker_thread+0xa53/0xfc0 kernel/workqueue.c:3478
 kthread+0x389/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
----------------
Code disassembly (best guess):
   0:	57                   	push   %rdi
   1:	01 ae fd e9 6d 01    	add    %ebp,0x16de9fd(%rsi)
   7:	00 00                	add    %al,(%rax)
   9:	e8 1d 0b 93 fd       	call   0xfd930b2b
   e:	84 c0                	test   %al,%al
  10:	74 22                	je     0x34
  12:	e8 44 01 ae fd       	call   0xfdae015b
  17:	e9 5a 01 00 00       	jmp    0x176
  1c:	e8 3a 01 ae fd       	call   0xfdae015b
  21:	48 8d 3d 23 e5 22 0c 	lea    0xc22e523(%rip),%rdi        # 0xc22e54b
  28:	89 de                	mov    %ebx,%esi
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	e9 b3 fc ff ff       	jmp    0xfffffce7
  34:	e8 82 57 93 07       	call   0x79357bb
  39:	41 89 c6             	mov    %eax,%r14d
  3c:	31 ff                	xor    %edi,%edi
  3e:	89 c6                	mov    %eax,%esi