linux-kernel - Re: Random panic in load

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Message-ID: <20140729085859.GS2397@laptop.redhat.com>
Date:	Tue, 29 Jul 2014 10:58:59 +0200
From:	Jakub Jelinek <jakub@...hat.com>
To:	Markus Trippelsdorf <markus@...ppelsdorf.de>
Cc:	Alexei Starovoitov <ast@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Michel Dänzer <michel@...nzer.net>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Debian GCC Maintainers <debian-gcc@...ts.debian.org>,
	Debian Kernel Team <debian-kernel@...ts.debian.org>
Subject: Re: Random panic in load_balance() with 3.16-rc

On Mon, Jul 28, 2014 at 08:09:02PM +0200, Markus Trippelsdorf wrote:
> Here's the testcase:
> 
> int a, b, c;
> void fn1 ()
> {
>   int d;
>   if (fn2 () && !0)
>     {
>       b = (
>            {
>            int e;
>            fn3 ();
>            switch (0)
>            default:
>            asm volatile("" : "=a"(e) : "0"(a), "i"(0));
>            e;
>            });
>       d = b;
>     }
>   c = d;
> }

int a, c;
int bar (void);
void baz (void);

void
foo (void)
{
  int d;
  if (bar ())
    {
      int e;
      baz ();
      asm volatile ("" : "=a" (e) : "0" (a), "i" (0));
      d = e;
    }
  c = d;
}

fails the same way and has more creduce cruft removed.
Fails also with 4.7 at -O2 -fcompare-debug.

	Jakub
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