BTRFS info (device loop7): block group 1048576 has 4194304 bytes, 4096 used 0 pinned 0 reserved 0 delalloc 0 super 0 zone_unusable (4190208 bytes available) 
BTRFS info (device loop7): block group has cluster?: no
BTRFS info (device loop7): 0 free space entries at or bigger than 4096 bytes
BTRFS info (device loop7): 4190208 bytes available across all block groups
------------[ cut here ]------------
BTRFS: Transaction aborted (error -28)
WARNING: CPU: 0 PID: 1104 at fs/btrfs/block-group.c:3947 do_chunk_alloc fs/btrfs/block-group.c:3947 [inline]
WARNING: CPU: 0 PID: 1104 at fs/btrfs/block-group.c:3947 btrfs_chunk_alloc+0xe42/0xfe0 fs/btrfs/block-group.c:4189
Modules linked in:
CPU: 0 PID: 1104 Comm: kworker/u4:7 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
Workqueue: events_unbound btrfs_async_reclaim_data_space
RIP: 0010:do_chunk_alloc fs/btrfs/block-group.c:3947 [inline]
RIP: 0010:btrfs_chunk_alloc+0xe42/0xfe0 fs/btrfs/block-group.c:4189
Code: c7 40 f7 ee 8a 89 ee e8 4c fc b7 fd 0f 0b 4c 89 fb e9 2f fe ff ff e8 cd 7e ed fd 48 c7 c7 40 f7 ee 8a 44 89 f6 e8 2e fc b7 fd <0f> 0b 4c 89 fb e9 7c fe ff ff e8 af 7e ed fd 48 c7 c7 40 f7 ee 8a
RSP: 0018:ffffc9000492f918 EFLAGS: 00010246
RAX: 5b314f762e37c100 RBX: ffff888025430001 RCX: ffff888023899e00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000002
RBP: 0000000000000000 R08: ffffc9000492f527 R09: 1ffff92000925ea4
R10: dffffc0000000000 R11: fffff52000925ea5 R12: ffff88807a380000
R13: dffffc0000000000 R14: ffffffffffffffe4 R15: ffff88802e015800
FS:  0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000193000 CR3: 0000000025017000 CR4: 00000000003506f0
Call Trace:
 <TASK>
 flush_space+0x516/0xd10 fs/btrfs/space-info.c:764
 btrfs_async_reclaim_data_space+0x12a/0x530 fs/btrfs/space-info.c:1283
 process_one_work kernel/workqueue.c:2634 [inline]
 process_scheduled_works+0xa45/0x15b0 kernel/workqueue.c:2711
 worker_thread+0xa55/0xfc0 kernel/workqueue.c:2792
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 </TASK>