------------[ cut here ]------------ btrfs_abort_should_print_stack(__error) WARNING: fs/btrfs/block-group.c:4228 at do_chunk_alloc fs/btrfs/block-group.c:4228 [inline], CPU#0: kworker/u8:9/1392 WARNING: fs/btrfs/block-group.c:4228 at btrfs_chunk_alloc+0x12e0/0x1330 fs/btrfs/block-group.c:4453, CPU#0: kworker/u8:9/1392 Modules linked in: CPU: 0 UID: 0 PID: 1392 Comm: kworker/u8:9 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2026 Workqueue: events_unbound btrfs_async_reclaim_data_space RIP: 0010:do_chunk_alloc fs/btrfs/block-group.c:4228 [inline] RIP: 0010:btrfs_chunk_alloc+0x12e0/0x1330 fs/btrfs/block-group.c:4453 Code: 24 28 e8 b3 06 f7 fd 48 ba 00 00 00 00 00 fc ff df e9 b9 fa ff ff e8 5f fe 86 fd eb 10 e8 58 fe 86 fd eb 09 e8 51 fe 86 fd 90 <0f> 0b 90 44 89 e9 f7 d9 e9 cc fb ff ff e8 3e fe 86 fd eb 10 e8 37 RSP: 0018:ffffc90005bff7b8 EFLAGS: 00010293 RAX: ffffffff8440d42f RBX: 1ffff1100f6d8516 RCX: ffff88802868be80 RDX: 0000000000000000 RSI: ffffffff8f410450 RDI: 00000000fffffffe RBP: ffff88807b6c2800 R08: ffff88802868be80 R09: 0000000000000003 R10: 00000000fffffffb R11: 0000000000000000 R12: 1ffff1100f6d8516 R13: 00000000fffffffe R14: 00000000fffffffe R15: ffff888026770001 FS: 0000000000000000(0000) GS:ffff888124cce000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb07946a020 CR3: 000000007a4cc000 CR4: 0000000000350ef0 Call Trace: flush_space+0x3df/0xde0 fs/btrfs/space-info.c:908 do_async_reclaim_data_space+0x137/0x550 fs/btrfs/space-info.c:1455 btrfs_async_reclaim_data_space+0x41/0x90 fs/btrfs/space-info.c:1519 process_one_work kernel/workqueue.c:3396 [inline] process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3479 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3560 kthread+0x38b/0x480 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