linux-kernel - Re: [tip:locking/kcsan 12/12] /bin/bash: line 1: 61526 Segmentation fault sparse ...

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Date:   Thu, 28 May 2020 09:55:53 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Borislav Petkov <bp@...e.de>
Cc:     kbuild test robot <lkp@...el.com>, Marco Elver <elver@...gle.com>,
        kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        x86@...nel.org, luc.vanoostenryck@...il.com
Subject: Re: [tip:locking/kcsan 12/12] /bin/bash: line 1: 61526 Segmentation
 fault  sparse ...

On Thu, May 28, 2020 at 01:54:42AM +0200, Borislav Petkov wrote:
> On Thu, May 28, 2020 at 07:39:31AM +0800, kbuild test robot wrote:
> > tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git locking/kcsan
> > head:   a5dead405f6be1fb80555bdcb77c406bf133fdc8
> > commit: a5dead405f6be1fb80555bdcb77c406bf133fdc8 [12/12] compiler_types.h: Optimize __unqual_scalar_typeof compilation time
> > config: i386-randconfig-s002-20200527 (attached as .config)
> > compiler: gcc-9 (Debian 9.3.0-13) 9.3.0
> > reproduce:
> >         # apt-get install sparse
> >         # sparse version: v0.6.1-240-gf0fe1cd9-dirty
> >         git checkout a5dead405f6be1fb80555bdcb77c406bf133fdc8
> >         # save the attached .config to linux build tree
> >         make W=1 C=1 ARCH=i386 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__'
> > 
> > If you fix the issue, kindly add following tag as appropriate
> > Reported-by: kbuild test robot <lkp@...el.com>
> > 
> > All errors (new ones prefixed by >>, old ones prefixed by <<):
> 
> I'll say.
> 
> Looking at the subject, that broke the 0day bot too. :-)
> 
> /me trims it.
> 
> Looks like we need __CHECKER__ ifdeffery somewhere but it is too late
> for me to think straight so tomorrow...

I think the problem is that sparse can't parse the C11 _Generic thing.
Someone needs to teach it new tricks.