------------[ cut here ]------------
BTRFS: Transaction aborted (error -28)
WARNING: fs/btrfs/block-group.c:4182 at btrfs_chunk_alloc+0x101d/0x15e0, CPU#1: kworker/u10:5/82
Modules linked in:
CPU: 1 UID: 0 PID: 82 Comm: kworker/u10:5 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Workqueue: events_unbound btrfs_async_reclaim_data_space
RIP: 0010:btrfs_chunk_alloc+0x101f/0x15e0
Code: 37 d4 af fd e9 6d 01 00 00 e8 2d f7 94 fd 84 c0 74 22 e8 24 d4 af fd e9 5a 01 00 00 e8 1a d4 af fd 48 8d 3d 93 84 24 0c 89 de <67> 48 0f b9 3a e9 b3 fc ff ff e8 e2 fa 91 07 41 89 c6 31 ff 89 c6
RSP: 0018:ffffc9000273f790 EFLAGS: 00010293
RAX: ffffffff8415cf96 RBX: ffffffffffffffe4 RCX: ffff8881692a8000
RDX: 0000000000000000 RSI: 00000000ffffffe4 RDI: ffffffff903a5430
RBP: 0000000000000000 R08: ffff8881692a8000 R09: 0000000000000003
R10: 00000000fffffffb R11: 0000000000000000 R12: 1ffff11021bed916
R13: ffff8881b8b9c930 R14: ffff888110a38001 R15: ffff8881b9b47800
FS:  0000000000000000(0000) GS:ffff8882a9293000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6aa07bd000 CR3: 0000000169990000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 flush_space+0x3fb/0xe20
 do_async_reclaim_data_space+0x145/0x520
 btrfs_async_reclaim_data_space+0x41/0x90
 process_scheduled_works+0xb5d/0x1860
 worker_thread+0xa53/0xfc0
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
