BTRFS info (device loop2): 0 blocks of free space at or bigger than bytes is
------------[ cut here ]------------
WARNING: CPU: 0 PID: 4277 at fs/btrfs/block-group.c:3688 do_chunk_alloc fs/btrfs/block-group.c:3688 [inline]
WARNING: CPU: 0 PID: 4277 at fs/btrfs/block-group.c:3688 btrfs_chunk_alloc+0xe47/0xff0 fs/btrfs/block-group.c:3930
Modules linked in:
CPU: 0 PID: 4277 Comm: kworker/u4:5 Not tainted 6.1.131-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Workqueue: events_unbound btrfs_async_reclaim_metadata_space
RIP: 0010:do_chunk_alloc fs/btrfs/block-group.c:3688 [inline]
RIP: 0010:btrfs_chunk_alloc+0xe47/0xff0 fs/btrfs/block-group.c:3930
Code: fd 48 c7 c7 e0 fb 51 8b 44 89 e6 e8 e3 e2 99 fd 0f 0b e9 02 fe ff ff e8 b7 cc d1 fd 48 c7 c7 e0 fb 51 8b 89 ee e8 c9 e2 99 fd <0f> 0b e9 0d fe ff ff e8 9d cc d1 fd 48 c7 c7 e0 fb 51 8b 44 89 e6
RSP: 0018:ffffc90003e079c8 EFLAGS: 00010246
RAX: 51b7e7ab4e862c00 RBX: ffff88806273c001 RCX: ffff88807e355940
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffffffffffffe4 R08: ffffffff8152c26e R09: fffff520007c0e99
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff888073ce4000
R13: dffffc0000000000 R14: ffff8880565fe000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055558f2655c8 CR3: 000000005c5e2000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 flush_space+0xa03/0xe60 fs/btrfs/space-info.c:766
 btrfs_async_reclaim_metadata_space+0x29b/0x340 fs/btrfs/space-info.c:1080
 process_one_work+0x917/0x1260 kernel/workqueue.c:2292
 worker_thread+0xa47/0x1200 kernel/workqueue.c:2439
 kthread+0x28d/0x320 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>