** Bug watch added: Linux Kernel Bug Tracker #218571
   https://bugzilla.kernel.org/show_bug.cgi?id=218571

** Also affects: linux via
   https://bugzilla.kernel.org/show_bug.cgi?id=218571
   Importance: Unknown
       Status: Unknown

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https://bugs.launchpad.net/bugs/2056448

Title:
  weird file system free block state after creating files and removing
  them with a mix of i/o operations

Status in Linux:
  Unknown
Status in linux package in Ubuntu:
  New

Bug description:
  Summary:

  create hfs file system, loop-back mount it, run iomix stessor with
  stress-ng to exercise with a mix of file I/O operations and remove
  files at end. File system is empty but a lot of blocks are used and
  can't seem to be recovered.

  Kernel: 6.8.0-11-generic

  test case:
  sudo apt-get install hfsprogs

  dd if=/dev/zero of=fs.img bs=1M count=2048
  mkfs.hfs fs.img 
  sudo mount fs.img /mnt
  sudo mkdir /mnt/x
  df /mnt
  Filesystem     1K-blocks  Used Available Use% Mounted on
  /dev/loop6       2097128  2015   2095113   1% /mnt

  
  sudo stress-ng --temp-path /mnt/x --iomix 1 -t 2

  df /mnt
  Filesystem     1K-blocks   Used Available Use% Mounted on
  /dev/loop6       2097128 674635   1422493  33% /mnt

  
  ls -alR /mnt/
  /mnt/:
  total 4
  drwxr-xr-x  1 root root    3 Mar  7 12:37 .
  drwxr-xr-x 23 root root 4096 Feb 28 14:13 ..
  drwxr-xr-x  1 root root    2 Mar  7 12:37 x

  /mnt/x:
  total 0
  drwxr-xr-x 1 root root 2 Mar  7 12:37 .
  drwxr-xr-x 1 root root 3 Mar  7 12:37 ..

  
  ..so file system is 33% full, but no files are on the file system. Something 
looks wrong here.

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