Re: FAILED: patch "[PATCH] tracing: Have trace_marker use per-cpu data to read user" failed to apply to 6.12-stable tree

On Tue, 14 Oct 2025 07:10:48 +0200 Greg KH gregkh@linuxfoundation.org wrote:

...

IIRC, this is a fix for something that went in after 6.12. So, don't need to backport it 6.12 or older.

The "Fixes:" tag references a commit that is in the following releases already: 5.10.245 5.15.194 6.1.153 6.6.107 6.12.48 6.16.8 6.17 so that's what triggered this message.

Correct. The bug has been there "forever", but because it required PREEMPT_NONE to trigger, and most people don't use that, it hasn't been reported.

The fix to the PREEMPT_NONE issue had a regression, thus both fixes technically need to go back to the beginning.

If I get time, I could work on backporting these patches.

-- Steve