From: "Arnd Bergmann" <arnd@arndb.de>
To: "Dan Carpenter" <dan.carpenter@linaro.org>
Cc: stable@vger.kernel.org,
"laurent.pinchart" <laurent.pinchart@ideasonboard.com>,
"Hans Verkuil" <hverkuil-cisco@xs4all.nl>,
"Mauro Carvalho Chehab" <mchehab+huawei@kernel.org>,
"Randy Dunlap" <rdunlap@infradead.org>
Subject: Re: randconfig fixes for 5.10.y
Date: Tue, 30 May 2023 21:20:52 +0200 [thread overview]
Message-ID: <41c61895-59f4-449c-9e2e-d127d7f95be5@app.fastmail.com> (raw)
In-Reply-To: <2fce7746-6d63-4853-9b20-8fa0b24d6f32@app.fastmail.com>
On Tue, May 30, 2023, at 21:02, Arnd Bergmann wrote:
>
> CONFIG_COMPILE_TEST=y forces a number of options to be
> hidden from build tests, which is generally super useful.
> The one that ended up hiding the stack growth above is
> CONFIG_GCOV_PROFILE_ALL. I'll try enabling it for a few
> builds to see what else shows up with it.
Update: you already pointed to UBSAN_SANITIZE_ALL causing
this, I can confirm that this is also the case. With your
config, the combination of CONFIG_GCOV_PROFILE_ALL and
CONFIG_UBSAN_SANITIZE_ALL causes the compiler to completely
mess up register allocation in this code, disabling either
of the two gets it below the boundary.
Arnd
next prev parent reply other threads:[~2023-05-30 19:21 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-05-30 8:22 randconfig fixes for 5.10.y Dan Carpenter
2023-05-30 8:53 ` Arnd Bergmann
2023-05-30 15:38 ` Dan Carpenter
2023-05-30 19:02 ` Arnd Bergmann
2023-05-30 19:20 ` Arnd Bergmann [this message]
2023-05-31 10:12 ` Arnd Bergmann
2023-05-31 16:37 ` Nick Desaulniers
2023-06-07 17:55 ` Greg KH
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