linux-kernel - Re: 6.0.0-RC kernels trigger Firefox snap bug with 6.0.0-rc3 through 6.0.0-rc7

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Message-ID: <7e0b733d-db73-f9a7-0965-4744e63f1a33@gmail.com>
Date:   Fri, 14 Oct 2022 19:28:31 +0700
From:   Bagas Sanjaya <bagasdotme@...il.com>
To:     Mirsad Todorovac <mirsad.todorovac@....unizg.hr>
Cc:     linux-kernel@...r.kernel.org, Slade Watkins <srw@...dewatkins.net>,
        Marc Miltenberger <marcmiltenberger@...il.com>,
        Thorsten Leemhuis <regressions@...mhuis.info>,
        "regressions@...ts.linux.dev" <regressions@...ts.linux.dev>
Subject: Re: 6.0.0-RC kernels trigger Firefox snap bug with 6.0.0-rc3 through
 6.0.0-rc7

On 10/14/22 17:32, Mirsad Todorovac wrote:
> I tried the "make localmodconfig" and provided the default answers ([ENTER]) to all questions
> the script asked as advised here: https://www.stolaf.edu/people/rab/os/linux-compile.html .
> 
> However, though it built much faster, the stripped version did not trigger the bug.
> 
> I am now trying to reproduce the bug with v6.0-rc[123] with config-{051913,060000}.
> This brings a lot of combinations, and though I am a newbie, I noticed that build scripts
> start with "make clean" for both deb-pkg and rpm-pkg.
> 
> Is there a way to rebuild only the stuff that changed between the versions?
> 

You can try building kernel with ccache enabled. However, you'll need
to unset build timestamp, since it will make builds non-deterministic:

	make CC="ccache gcc" KBUILD_BUILD_TIMESTAMP=""

The first ccache build will be slower than normal build, because the
object files needs to be written twice (to the output directory and
to the cache), though.

Thanks.

-- 
An old man doll... just what I always wanted! - Clara