[Bug 222081] New: xfs stops if link count is to high

[Bug 222081] New: xfs stops if link count is to high

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=222081

            Bug ID: 222081
           Summary: xfs stops if link count is to high
           Product: File System
           Version: 2.5
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: high
          Priority: P3
         Component: XFS
          Assignee: filesystem_xfs@kernel-bugs.kernel.org
          Reporter: sachse@gmx.net
        Regression: No

Created attachment 310977
  --> https://bugzilla.kernel.org/attachment.cgi?id=310977&action=edit
Kernel trace

Environment is an docker on a xfs with overlay.
Inside the docker a bitbake/yocto build is running.

Is link count reaches 552 an allocation error occours and the filesystem is
stopped.

Kernels: 6.18.28 and 6.18.48

-- 
You may reply to this email to add a comment.

You are receiving this mail because:
You are watching the assignee of the bug.

[Bug 222081] xfs stops if link count is to high

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=222081

--- Comment #1 from sachse@gmx.net ---
Created attachment 310978
  --> https://bugzilla.kernel.org/attachment.cgi?id=310978&action=edit
Output of xfs_info

-- 
You may reply to this email to add a comment.

You are receiving this mail because:
You are watching the assignee of the bug.

[Bug 222081] xfs stops if link count is to high

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=222081

--- Comment #2 from sachse@gmx.net ---
Created attachment 310979
  --> https://bugzilla.kernel.org/attachment.cgi?id=310979&action=edit
Output of find with link count

-- 
You may reply to this email to add a comment.

You are receiving this mail because:
You are watching the assignee of the bug.

[Bug 222081] xfs stops if link count is to high

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=222081

--- Comment #3 from sachse@gmx.net ---
mkfs.xfs version 6.19.0

-- 
You may reply to this email to add a comment.

You are receiving this mail because:
You are watching the assignee of the bug.

[Bug 222081] xfs stops if link count is to high

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=222081

--- Comment #4 from sachse@gmx.net ---
Note: Creating the the filesystem with "parent=0" the crash not occurs.

-- 
You may reply to this email to add a comment.

You are receiving this mail because:
You are watching the assignee of the bug.

Re: [Bug 222081] xfs stops if link count is to high

[Darrick J. Wong]

Could you capture a metadump of the affected filesystem, please?

I couldn't reproduce it on upstream 7.3-rc6 and nobody's responsible for
QA'ing 6.18 so there's little to work from, I'm afraid.

--D

On Wed, Sep 30, 2026 at 08:24:33PM +0000, bugzilla-daemon@kernel.org wrote:
> https://bugzilla.kernel.org/show_bug.cgi?id=222081
> 
> --- Comment #4 from sachse@gmx.net ---
> Note: Creating the the filesystem with "parent=0" the crash not occurs.
> 
> -- 
> You may reply to this email to add a comment.
> 
> You are receiving this mail because:
> You are watching the assignee of the bug.

[Bug 222081] xfs stops if link count is to high

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=222081

--- Comment #5 from Darrick J. Wong (djwong@kernel.org) ---
Could you capture a metadump of the affected filesystem, please?

I couldn't reproduce it on upstream 7.3-rc6 and nobody's responsible for
QA'ing 6.18 so there's little to work from, I'm afraid.

--D

On Wed, Sep 30, 2026 at 08:24:33PM +0000, bugzilla-daemon@kernel.org wrote:
> https://bugzilla.kernel.org/show_bug.cgi?id=222081
> 
> --- Comment #4 from sachse@gmx.net ---
> Note: Creating the the filesystem with "parent=0" the crash not occurs.
> 
> -- 
> You may reply to this email to add a comment.
> 
> You are receiving this mail because:
> You are watching the assignee of the bug.

-- 
You may reply to this email to add a comment.

You are receiving this mail because:
You are watching the assignee of the bug.

[Bug 222081] xfs stops if link count is to high

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=222081

--- Comment #6 from sachse@gmx.net ---
The crashed filesystem no longer exists because its a productive system which
must be fixed fast.
From the current running filesystem I can create it if you provide me the
commands.

-- 
You may reply to this email to add a comment.

You are receiving this mail because:
You are watching the assignee of the bug.

Re: [Bug 222081] xfs stops if link count is to high

[Darrick J. Wong]

On Wed, Oct 07, 2026 at 07:50:37AM +0000, bugzilla-daemon@kernel.org wrote:
> https://bugzilla.kernel.org/show_bug.cgi?id=222081
> 
> --- Comment #6 from sachse@gmx.net ---
> The crashed filesystem no longer exists because its a productive system which
> must be fixed fast.
> From the current running filesystem I can create it if you provide me the
> commands.

# xfs_metadump -a -g -o /dev/sdXX /tmp/brokenfs.metadump
# zstd -9 /tmp/brokenfs.metadump

--D

> -- 
> You may reply to this email to add a comment.
> 
> You are receiving this mail because:
> You are watching the assignee of the bug.

[Bug 222081] xfs stops if link count is to high

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=222081

--- Comment #7 from Darrick J. Wong (djwong@kernel.org) ---
On Wed, Oct 07, 2026 at 07:50:37AM +0000, bugzilla-daemon@kernel.org wrote:
> https://bugzilla.kernel.org/show_bug.cgi?id=222081
> 
> --- Comment #6 from sachse@gmx.net ---
> The crashed filesystem no longer exists because its a productive system which
> must be fixed fast.
> From the current running filesystem I can create it if you provide me the
> commands.

# xfs_metadump -a -g -o /dev/sdXX /tmp/brokenfs.metadump
# zstd -9 /tmp/brokenfs.metadump

--D

> -- 
> You may reply to this email to add a comment.
> 
> You are receiving this mail because:
> You are watching the assignee of the bug.

-- 
You may reply to this email to add a comment.

You are receiving this mail because:
You are watching the assignee of the bug.