BTRFS error (device loop0): failed to run delayed ref for logical 5259264 num_bytes 4096 type 176 action 1 ref_mod 1: -28
------------[ cut here ]------------
btrfs_abort_should_print_stack(__error)
WARNING: fs/btrfs/extent-tree.c:2248 at btrfs_run_delayed_refs+0x292/0x2a0 fs/btrfs/extent-tree.c:2248, CPU#0: kworker/u4:5/133
Modules linked in:
CPU: 0 UID: 0 PID: 133 Comm: kworker/u4:5 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_metadata_space
RIP: 0010:btrfs_run_delayed_refs+0x292/0x2a0 fs/btrfs/extent-tree.c:2248
Code: c1 38 c1 0f 8c ea fd ff ff 4c 89 ef e8 67 22 2b fe e9 dd fd ff ff e8 7d df bb fd eb 10 e8 76 df bb fd eb 09 e8 6f df bb fd 90 <0f> 0b 90 44 89 e9 f7 d9 e9 71 ff ff ff 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc900015777e0 EFLAGS: 00010293
RAX: ffffffff840b33c1 RBX: ffff8880443362f0 RCX: ffff888032d92580
RDX: 0000000000000000 RSI: ffffffff8f1b9050 RDI: 00000000ffffffe4
RBP: 0000000000000001 R08: ffff888032d92580 R09: 0000000000000003
R10: 00000000fffffffb R11: 0000000000000000 R12: ffff888012e1a000
R13: 00000000ffffffe4 R14: 00000000ffffffe4 R15: 0000000000120000
FS:  0000000000000000(0000) GS:ffff88808c534000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f038561f148 CR3: 0000000012b54000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 flush_space+0x56d/0xde0 fs/btrfs/space-info.c:-1
 do_async_reclaim_metadata_space+0x3e8/0x940 fs/btrfs/space-info.c:1211
 btrfs_async_reclaim_metadata_space+0x89/0xe0 fs/btrfs/space-info.c:1278
 process_one_work kernel/workqueue.c:3322 [inline]
 process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3405
 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3486
 kthread+0x388/0x470 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>