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Subject: Re: [hwloc-devel] hwloc-1.2a1r2694 and hwloc-1.2a1r2751
From: Jirka Hladky (jhladky_at_[hidden])
Date: 2010-11-11 08:15:34


Hi Brice,

this one is tricky. I don't see this crash when compiling by hand (./configure
&& make && make check). I see the crash only when building with rpmbuild. It
happens both with 2694 and 2751.

rpmbuild is applying automatically CFLAGS flags. Finally, I have reduced it to

cd hwloc-1.2a1r2751/
export CFLAGS='-O2'
./configure && make && make check

It works fine with -O1

Please try if you can reproduce the problem with
=======================================================
$make clean && export CFLAGS='-g -O2' && ./configure && make && make check
=======================================================

This is gdb output:
=====================================================
gdb /tmp/J/hwloc-1.2a1r2751/tests/.libs/lt-linux-libnuma
(gdb) run
Starting program: /tmp/J/hwloc-1.2a1r2751/tests/.libs/lt-linux-libnuma

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff7deb632 in hwloc_get_type_depth (topology=0x0, type=HWLOC_OBJ_NODE)
at traversal.c:17
=====================================================

I have the feeling it's gcc bug. Any feedback?

Thanks
Jirka

On Wednesday, November 10, 2010 07:33:19 pm Brice Goglin wrote:
> I don't see any change in this test between 2694 and 2751. Do you get a
> better backtrace if you compile in debug mode (and/or with CFLAGS="-g
> -O0") or with gdb?
>
> Brice
>
> Le 10/11/2010 15:56, Jirka Hladky a écrit :
> > Hi Brice,
> >
> > just a quick check.
> >
> > I see following when running make check for hwloc-1.2a1r2694
> >
> > ======================================================
> > PASS: hwloc_insert_misc
> > *** buffer overflow detected ***:
> > /home/jhladky/rpmbuild/BUILD/hwloc-1.2a1r2694/tests/.libs/lt-linux-libnum
> > a terminated
> > ======= Backtrace: =========
> > /lib64/libc.so.6(__fortify_fail+0x37)[0x30cfcf7707]
> > /lib64/libc.so.6[0x30cfcf5720]
> > /home/jhladky/rpmbuild/BUILD/hwloc-1.2a1r2694/tests/.libs/lt-linux-
> > libnuma[0x401ae9]
> > /lib64/libc.so.6(__libc_start_main+0xfd)[0x30cfc1eb1d]
> > /home/jhladky/rpmbuild/BUILD/hwloc-1.2a1r2694/tests/.libs/lt-linux-
> > libnuma[0x401059]
> > ======= Memory map: ========
> > 00400000-00404000 r-xp 00000000 fd:00 1230911
> > /home/jhladky/rpmbuild/BUILD/hwloc-1.2a1r2694/tests/.libs/lt-linux-libnum
> > a 00603000-00604000 rw-p 00003000 fd:00 1230911
> > /home/jhladky/rpmbuild/BUILD/hwloc-1.2a1r2694/tests/.libs/lt-linux-libnum
> > a 019a6000-019c7000 rw-p 00000000 00:00 0
> > [heap]
> > 30cf800000-30cf81e000 r-xp 00000000 08:02 48991
> > /lib64/ld-2.11.2.so
> > ===================================================
> >
> > It's running just fine when using hwloc-1.2a1r2751
> >
> > Have you fixed this test in hwloc-1.2a1r2751?
> >
> > Thanks!
> > Jirka