------------[ cut here ]------------
BTRFS: Transaction aborted (error -28)
WARNING: fs/btrfs/block-group.c:4182 at btrfs_chunk_alloc+0x101d/0x15e0, CPU#0: kworker/u9:62/13099
Modules linked in:
CPU: 0 UID: 0 PID: 13099 Comm: kworker/u9:62 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: 77 a7 af fd e9 6d 01 00 00 e8 4d bf 94 fd 84 c0 74 22 e8 64 a7 af fd e9 5a 01 00 00 e8 5a a7 af fd 48 8d 3d e3 62 24 0c 89 de <67> 48 0f b9 3a e9 b3 fc ff ff e8 02 b0 92 07 41 89 c6 31 ff 89 c6
RSP: 0018:ffffc90008347790 EFLAGS: 00010293
RAX: ffffffff84161a76 RBX: ffffffffffffffe4 RCX: ffff888119a50000
RDX: 0000000000000000 RSI: 00000000ffffffe4 RDI: ffffffff903a7d60
RBP: 0000000000000000 R08: ffff888119a50000 R09: 0000000000000003
R10: 00000000fffffffb R11: 0000000000000000 R12: 1ffff11037956116
R13: ffff888117caf958 R14: ffff88816e120001 R15: ffff8881159b1000
FS:  0000000000000000(0000) GS:ffff88818dc8c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fab26eb7d58 CR3: 0000000115fe6000 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>
