------------[ cut here ]------------
BTRFS: Transaction aborted (error -28)
WARNING: fs/btrfs/block-group.c:4105 at btrfs_chunk_alloc+0x101d/0x15e0, CPU#0: kworker/u10:0/27
Modules linked in:
CPU: 0 UID: 0 PID: 27 Comm: kworker/u10:0 Not tainted syzkaller #0 PREEMPT(full) 
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_metadata_space
RIP: 0010:btrfs_chunk_alloc+0x101f/0x15e0
Code: 77 61 b3 fd e9 6d 01 00 00 e8 5d 75 98 fd 84 c0 74 22 e8 64 61 b3 fd e9 5a 01 00 00 e8 5a 61 b3 fd 48 8d 3d 43 f2 08 0c 89 de <67> 48 0f b9 3a e9 b3 fc ff ff e8 92 ab 9b 07 41 89 c6 31 ff 89 c6
RSP: 0018:ffffc90000a276f0 EFLAGS: 00010293
RAX: ffffffff84123c56 RBX: ffffffffffffffe4 RCX: ffff8881604dba80
RDX: 0000000000000000 RSI: 00000000ffffffe4 RDI: ffffffff901b2ea0
RBP: 0000000000000000 R08: ffff8881604dba80 R09: 0000000000000003
R10: 00000000fffffffb R11: 0000000000000000 R12: 1ffff11023c9d416
R13: ffff8881b5afc9a0 R14: ffff888113bec001 R15: ffff88816feb4800
FS:  0000000000000000(0000) GS:ffff88818de63000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1a68a7f000 CR3: 000000017406e000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 flush_space+0x353/0xd80
 do_async_reclaim_metadata_space+0x3fc/0x960
 btrfs_async_reclaim_metadata_space+0x89/0xe0
 process_scheduled_works+0xb02/0x1830
 worker_thread+0xa50/0xfc0
 kthread+0x388/0x470
 ret_from_fork+0x51e/0xb90
 ret_from_fork_asm+0x1a/0x30
 </TASK>
