Re: Possible gcc/s390x bug (was Re: Mass rebuild status)

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On Tue, Feb 04, 2020 at 11:08:22AM -0500, Marek Polacek wrote:
> On Tue, Feb 04, 2020 at 10:51:17AM -0500, Adam Jackson wrote:
> > On Sat, 2020-02-01 at 16:59 -0800, Kevin Fenzi wrote:
> > 
> > > See
> > > https://kojipkgs.fedoraproject.org/mass-rebuild/f32-failures.html
> > > and
> > > https://kojipkgs.fedoraproject.org/mass-rebuild/f32-need-rebuild.html
> > > 
> > > for detailed lists of what needs rebuilding and what failed. 
> > 
> > libXt's failure on s390x seems to be repeatable, unique to that
> > architecture, and frankly hilarious:
> 
> Actually I can also reproduce on x86_64 with -O3:
> 
> $ ./cc1 -quiet -O3 -Werror=array-bounds ajax.i
> PassivGrab.c: In function ‘_XtCheckServerGrabsOnWidget’:
> PassivGrab.c:291:54: error: array subscript 0 is outside array bounds of ‘XtServerGrabRec[1]’ {aka ‘struct _XtServerGrabRec[1]’} [-Werror=array-bounds]
> PassivGrab.c:546:21: note: while referencing ‘tempGrab’
> 
> > PassivGrab.c: In function '_XtCheckServerGrabsOnWidget':
> > PassivGrab.c:292:35: error: array subscript 0 is outside array bounds of 'XtServerGrabRec[1]' {aka 'struct _XtServerGrabRec[1]'} [-Werror=array-bounds]
> >   292 |  first.pMask = GRABEXT(pFirstGrab)->pModifiersMask;
> > PassivGrab.c:556:22: note: while referencing 'tempGrab'
> >   556 |     XtServerGrabRec  tempGrab;
> >       |                      ^~~~~~~~
> > 
> > Where GRABEXT here is just doing the standard C trick for incrementing
> > past the current struct and returning a (differently typed) pointer to
> > the data beyond:
> > 
> > #define GRABEXT(p) ((XtServerGrabExtPtr)((p)+1))
> > 
> > A scratch build, including a dump of PassivGrab.i in the build.log, can
> > be found here:
> > 
> > https://koji.fedoraproject.org/koji/taskinfo?taskID=41355653
> > 
> > Any ideas?
> 
> Thanks, we'll take a look.

I've reduced the code and opened
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93582

--
Marek Polacek • Red Hat, Inc. • 300 A St, Boston, MA
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