------------[ cut here ]------------
btrfs_abort_should_print_stack(__error)
WARNING: fs/btrfs/block-group.c:4208 at btrfs_chunk_alloc+0x10cc/0x1330, CPU#0: kworker/u9:4/3395
Modules linked in:
CPU: 0 UID: 0 PID: 3395 Comm: kworker/u9:4 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+0x10cc/0x1330
Code: 07 38 c1 0f 8c e9 ef ff ff 48 89 df e8 fd e7 f7 fd e9 dc ef ff ff e8 c3 4e 87 fd eb 10 e8 bc 4e 87 fd eb 09 e8 b5 4e 87 fd 90 <0f> 0b 90 44 89 f1 f7 d9 e9 38 fd ff ff 48 8b 4c 24 08 48 83 c1 5b
RSP: 0018:ffffc9002024f7b8 EFLAGS: 00010293
RAX: ffffffff8440681b RBX: 1ffff1103472f416 RCX: ffff88810f2d3c00
RDX: 0000000000000000 RSI: ffffffff9040d6c0 RDI: 00000000ffffffe4
RBP: ffff8881b1a40001 R08: ffff88810f2d3c00 R09: 0000000000000003
R10: 00000000fffffffb R11: 0000000000000000 R12: 1ffff1103472f416
R13: 00000000ffffffe4 R14: ffffffffffffffe4 R15: ffff8881163e6140
FS:  0000000000000000(0000) GS:ffff88818c4d4000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0820182ff8 CR3: 00000001092fc000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 flush_space+0x3df/0xde0
 do_async_reclaim_data_space+0x137/0x550
 btrfs_async_reclaim_data_space+0x41/0x90
 process_scheduled_works+0xc3d/0x1630
 worker_thread+0xa47/0xfb0
 kthread+0x38b/0x480
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
