From: Arnd Bergmann <arnd@arndb.de>
To: Rong Chen <rong.a.chen@intel.com>
Cc: kernel test robot <lkp@intel.com>,
kbuild-all@lists.01.org,
clang-built-linux <clang-built-linux@googlegroups.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Nathan Chancellor <nathan@kernel.org>,
Kees Cook <keescook@chromium.org>,
Andrew Morton <akpm@linux-foundation.org>,
Linux Memory Management List <linux-mm@kvack.org>
Subject: Re: [linux-stable-rc:linux-5.10.y 3189/5262] drivers/usb/dwc2/hcd.c:3835:6: warning: stack frame size of 1032 bytes in function 'dwc2_hcd_dump_state'
Date: Thu, 20 May 2021 11:27:06 +0200 [thread overview]
Message-ID: <CAK8P3a3hc67Ks_j8cXokOQBQBEJfMbrDLHfDTXcPFYQfxga=ag@mail.gmail.com> (raw)
In-Reply-To: <e65bc9b7-13ef-0e83-1ec5-0287d5875d2c@intel.com>
On Thu, May 20, 2021 at 11:22 AM Rong Chen <rong.a.chen@intel.com> wrote:
> On 5/20/21 4:28 AM, Arnd Bergmann wrote:
> > On Wed, May 19, 2021 at 9:48 PM kernel test robot <lkp@intel.com> wrote:
> >> tree: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-5.10.y
> >> head: 689e89aee55c565fe90fcdf8a7e53f2f976c5946
> >> commit: 5f2f616343b1d62d26f24316fbfc107ecf0983a9 [3189/5262] linux/compiler-clang.h: define HAVE_BUILTIN_BSWAP*
> >> config: mips-randconfig-r015-20210519 (attached as .config)
> >> compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 8e93d10633d751a3e9169bf9fa68326925ffa097)
> >> reproduce (this is a W=1 build):
> >> wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
> >> chmod +x ~/bin/make.cross
> >> # install mips cross compiling tool for clang build
> >> # apt-get install binutils-mips-linux-gnu
> >> # https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git/commit/?id=5f2f616343b1d62d26f24316fbfc107ecf0983a9
> >> git remote add linux-stable-rc https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git
> >> git fetch --no-tags linux-stable-rc linux-5.10.y
> >> git checkout 5f2f616343b1d62d26f24316fbfc107ecf0983a9
> >> # save the attached .config to linux build tree
> >> COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=mips
> >>
> >> If you fix the issue, kindly add following tag as appropriate
> >> Reported-by: kernel test robot <lkp@intel.com>
> >>
> >> All warnings (new ones prefixed by >>):
> >>
> > I analyzed another bug like this today, and I think this is again just
> > CONFIG_UBSAN_ALIGNMENT=y
> > on mips/clang causing tons of these warnings.
> >
> > I don't think this should be considered a regression, but we may want
> > to change either the
> > kernel or the 0day bot from test building this combination of options.
> >
> > Arnd
> >
>
> Hi Arnd,
>
> We have disabled CONFIG_UBSAN_ALIGNMENT for mips/clang in our kconfigs
> to avoid reporting such warnings again.
Thanks a lot, that helps.
Have you considered always enforcing CONFIG_COMPILE_TEST=y for any
randconfig build? That would address this issue along with a number of similar
ones. I have sent a number of patches to add COMPILE_TEST dependencies
for things that otherwise break in randconfig builds but could still be useful
in more specific cases when users know better.
Arnd
next prev parent reply other threads:[~2021-05-20 9:28 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-19 19:48 kernel test robot
2021-05-19 20:28 ` Arnd Bergmann
2021-05-20 9:20 ` Rong Chen
2021-05-20 9:27 ` Arnd Bergmann [this message]
2021-05-20 9:56 ` [kbuild-all] " Rong Chen
2021-05-21 0:57 ` Philip Li
2021-05-21 8:09 ` Arnd Bergmann
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