BTRFS info (device loop0): block group 1048576 has 4194304 bytes, 4096 used 0 pinned 0 reserved 0 delalloc 0 super 0 zone_unusable (4190208 bytes available) [readonly]
BTRFS info (device loop0): block group has cluster?: no
BTRFS info (device loop0): 0 free space entries at or bigger than 4096 bytes
BTRFS info (device loop0): 4190208 bytes available across all block groups
------------[ cut here ]------------
BTRFS: Transaction aborted (error -28)
WARNING: CPU: 1 PID: 5999 at fs/btrfs/block-group.c:4000 do_chunk_alloc fs/btrfs/block-group.c:4000 [inline]
WARNING: CPU: 1 PID: 5999 at fs/btrfs/block-group.c:4000 btrfs_chunk_alloc+0x12cc/0x1990 fs/btrfs/block-group.c:4241
Modules linked in:
CPU: 1 UID: 0 PID: 5999 Comm: kworker/u8:10 Not tainted 6.16.0-syzkaller-04405-g4b290aae788e #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Workqueue: events_unbound btrfs_async_reclaim_metadata_space
RIP: 0010:do_chunk_alloc fs/btrfs/block-group.c:4000 [inline]
RIP: 0010:btrfs_chunk_alloc+0x12cc/0x1990 fs/btrfs/block-group.c:4241
Code: 83 f8 19 77 0f ba 01 00 04 02 48 0f a3 c2 0f 82 4b 01 00 00 e8 05 6c bf fd 90 48 c7 c7 e0 b0 fd 8b 44 89 e6 e8 c5 f8 7d fd 90 <0f> 0b 90 90 41 b8 01 00 00 00 44 89 44 24 10 e8 e0 6b bf fd 44 8b
RSP: 0018:ffffc9000ac379e8 EFLAGS: 00010282
RAX: 0000000000000000 RBX: ffff88803a3e48e8 RCX: ffffffff817a36a8
RDX: ffff888032c29e00 RSI: ffffffff817a36b5 RDI: 0000000000000001
RBP: ffff888047f40800 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 00000000ffffffe4
R13: ffffffffffffffe4 R14: ffff88804fe96000 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff88812482b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000927000 CR3: 000000007a1ce000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 flush_space+0x87c/0xe40 fs/btrfs/space-info.c:861
 do_async_reclaim_metadata_space+0x18d/0x3e0 fs/btrfs/space-info.c:1158
 btrfs_async_reclaim_metadata_space+0xd0/0x160 fs/btrfs/space-info.c:1226
 process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3238
 process_scheduled_works kernel/workqueue.c:3321 [inline]
 worker_thread+0x6c8/0xf10 kernel/workqueue.c:3402
 kthread+0x3c5/0x780 kernel/kthread.c:464
 ret_from_fork+0x5d7/0x6f0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>