BTRFS error (device loop4): allocation failed flags 2, wanted 4096 tree-log 0, relocation: 0 ------------[ cut here ]------------ BTRFS: Transaction aborted (error -28) WARNING: CPU: 0 PID: 5240 at fs/btrfs/block-group.c:3839 do_chunk_alloc fs/btrfs/block-group.c:3839 [inline] WARNING: CPU: 0 PID: 5240 at fs/btrfs/block-group.c:3839 btrfs_chunk_alloc+0xedb/0xfa0 fs/btrfs/block-group.c:4081 Modules linked in: CPU: 0 PID: 5240 Comm: kworker/u4:3 Not tainted 6.6.0-syzkaller-16039-gac347a0655db #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023 Workqueue: events_unbound btrfs_async_reclaim_metadata_space RIP: 0010:do_chunk_alloc fs/btrfs/block-group.c:3839 [inline] RIP: 0010:btrfs_chunk_alloc+0xedb/0xfa0 fs/btrfs/block-group.c:4081 Code: fd 48 c7 c7 60 41 ad 8b 44 89 e6 e8 bf 37 9a fd 0f 0b e9 1d fe ff ff e8 13 80 d4 fd 48 c7 c7 60 41 ad 8b 89 ee e8 a5 37 9a fd <0f> 0b e9 28 fe ff ff e8 f9 7f d4 fd 48 c7 c7 60 41 ad 8b 44 89 e6 RSP: 0018:ffffc90004d57968 EFLAGS: 00010246 RAX: ebf91ccdb1335500 RBX: ffff8880722e8001 RCX: ffff888071d95940 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffffffffffffe4 R08: ffffffff81547c82 R09: 1ffff920009aae80 R10: dffffc0000000000 R11: fffff520009aae81 R12: ffff888077da5800 R13: dffffc0000000000 R14: ffff88801e856000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f3011ac2723 CR3: 0000000016f21000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: flush_space+0x4d6/0xce0 fs/btrfs/space-info.c:784 btrfs_async_reclaim_metadata_space+0x29f/0x350 fs/btrfs/space-info.c:1089 process_one_work kernel/workqueue.c:2630 [inline] process_scheduled_works+0x90f/0x1400 kernel/workqueue.c:2703 worker_thread+0xa5f/0xff0 kernel/workqueue.c:2784 kthread+0x2d3/0x370 kernel/kthread.c:388 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242