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Please enable CONFIG_FUNCTION_GRAPH_RETVAL

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  Please enable CONFIG_FUNCTION_GRAPH_RETVAL alexandre.ferrieux@orange.com - 2025-06-20 15:20 +0200
    Re: Please enable CONFIG_FUNCTION_GRAPH_RETVAL Ben Hutchings <ben@decadent.org.uk> - 2025-06-23 22:30 +0200

#88079 — Please enable CONFIG_FUNCTION_GRAPH_RETVAL

Dear Maintainers,

I have posted https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1106120 , but I
understand that due to the precise kernel version being part of the package name
("linux-image-6.12.19-amd64"), the report is not automatically pushed to more
recent versions.

So, I'm taking the liberty to ask you directly: could you please have a look ?

In summary: ftrace has a new feature "funcgraph-retval" that is simultaneously a
life-saver for hard kernel investigations in production, absolutely innocuous
for the non-debug workflow, and of very light overhead for the debug workflow
(as there is a runtime toggle).
These investigations happen on real-life servers where recompiling the kernel is
out of the question; so, it is very frustrating to see it disabled in Debian
production kernels.
Thanks in advance,

-Alex

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#88123

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On Fri, 2025-06-20 at 14:46 +0200, alexandre.ferrieux@orange.com wrote:
> Dear Maintainers,
> 
> I have posted https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1106120 , but I
> understand that due to the precise kernel version being part of the package name
> ("linux-image-6.12.19-amd64"), the report is not automatically pushed to more
> recent versions.
[...]

The report was automatically assigned to the linux source package, not
to that specific versioned binary package.  So it is still visible as a
relevant bug report.

Ben.

-- 
Ben Hutchings
Power corrupts.  Absolute power is kind of neat. - John Lehman

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