[Bug 2100730] [NEW] ls Undercounts Files/Directories on btrfs Kubuntu 24.04

[Gregg Butler]

Public bug reported:

Description:
On a fresh Kubuntu 24.04 installation using the Btrfs filesystem, the ls 
command fails to list all files and directories correctly after extracting 
tarballs. The find command, however, accurately shows the full count of files 
and directories. This issue was first observed with zstd compression enabled on 
Btrfs and persisted unchanged after switching to lzo compression as part of 
troubleshooting efforts.
Steps to Reproduce:
Install Kubuntu 24.04 with Btrfs, initially configured with compress=zstd 
(later changed to compress=lzo during troubleshooting).  

Download a tarball, such as the Tor Browser tarball:  
bash

wget https://www.torproject.org/dist/torbrowser/14.0.6/tor-browser-
linux-x86_64-14.0.6.tar.xz

Extract the tarball:  
bash

tar -xJvf tor-browser-linux-x86_64-14.0.6.tar.xz

Compare the outputs of the following commands:  
ls -l tor-browser/ | wc -l (undercounts files, e.g., shows ~20 instead of 
~295).  

find tor-browser/ -type f | wc -l (shows the correct file count, e.g.,
~295).

Expected Behavior:
The ls command should list all files and directories, matching the contents of 
the tarball and the output of the find command.
Actual Behavior:
The ls command lists significantly fewer files than actually exist (e.g., 20 
instead of 295), while find correctly identifies all files.
System Information:
OS Version: Kubuntu 24.04  

Kernel Version: 6.8.0-54-generic

Btrfs Version: [Run btrfs --version in your terminal and insert the
output here, e.g., v6.8]

Mount Options: defaults,subvol=@,relatime,discard,compress=lzo
(initially compress=zstd, switched to lzo with no effect)

Additional Notes:
The issue occurs consistently across multiple tarballs (e.g., SQLite, Tor 
Browser).  

No relevant errors appear in dmesg or journalctl related to Btrfs or
file operations.

Switching from zstd to lzo compression was attempted as a
troubleshooting step but did not resolve the issue.

** Affects: linux (Ubuntu)
 Importance: Undecided
 Status: New

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Title:
  ls Undercounts Files/Directories on btrfs Kubuntu 24.04

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[Bug 2100730] Re: ls Undercounts Files/Directories on btrfs Kubuntu 24.04

[Gregg Butler]

Re: Additional Debugging Information for Bug #2100730

Hello Benjamin and Ubuntu Team,

Thank you for your response and for assigning this bug. I appreciate
your efforts to diagnose the issue with `ls` undercounting files on
Btrfs in Kubuntu 24.04. I no longer have access to the system where the
bug was discovered so, I’m unable to provide the additional debug logs
requested via `apport-collect 2100730` at this time.

I’m happy to see the bug being addressed and hope the existing
description and steps to reproduce are sufficient for further
investigation. Please feel free to reach out if there’s any other way I
can assist in the future or if you have questions about the reported
behavior.

I’ll mark this bug as “Confirmed” as requested, and I look forward to
any updates or resolutions.

Best regards,
Gregg Butler

** Changed in: linux (Ubuntu)
   Status: Incomplete => Confirmed

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https://bugs.launchpad.net/bugs/2100730

Title:
  ls Undercounts Files/Directories on btrfs Kubuntu 24.04

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