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Message-ID: <20170307205529.GD18936@gmail.com>
Date: Tue, 7 Mar 2017 17:55:29 -0300
From: Breno Leitao <leitao@...ian.org>
To: musl@...ts.openwall.com
Subject: Re: musl segfaulting when compiled with -O2
Hi Rich,
On Tue, Mar 07, 2017 at 03:39:05PM -0500, Rich Felker wrote:
> On Tue, Mar 07, 2017 at 05:32:35PM -0300, Breno Leitao wrote:
> > Musl package on Debian on ppc64le is broken.
> >
> > When running any software with it, it segfaults. Doing a little bit of
> > debugging I found that libc.so is broken.
> >
> > I got the upstream code, and found that the problme is also
> > reproducible.
> >
> > I found that the problem only happen when compiling with -O2 and -O3. If
> > I compile musl with -O1 or -O0, the problm does not happen.
> >
> > This is the bt of the code that crashes:
> >
> > (gdb) bt
> > #0 0x0000000148b84dc0 in ?? ()
> > #1 0x0000000048bdb8dc in _dlstart_c (sp=0x3fffc33294b0, dynv=<optimized out>) at ldso/dlstart.c:147
> > #2 0x0000000048bdebe0 in _dlstart ()
> >
> > (gdb) up
> > #1 0x0000000048bdb8dc in _dlstart_c (sp=0x3fffc33294b0, dynv=<optimized out>) at ldso/dlstart.c:147
> > 147 dls2((void *)base, sp);
> >
> > $ gcc --version
> > gcc (Debian 6.3.0-5) 6.3.0 20170124
> >
> > Not sure if this is a GCC issue or a musl issue now.
>
> Can you post the crashing libc.so somewhere? Depending on how they're
> building it, the problem could be in various different places. A
> glibc-targeted powerpc* gcc is not suitable for compiling musl, since
> it has various ABI mismatches, but that's probably not what you're
> seeing here even if one was used.
Sure. You can grab it directly from Debian:
$ wget http://cdn-fastly.deb.debian.org/debian/pool/main/m/musl/musl_1.1.16-2_ppc64el.deb
$ dpkg-deb -x musl_1.1.16-2_ppc64el.deb .
$ lib/powerpc64le-linux-musl/libc.so
[2] 25672 segmentation fault (core dumped) lib/powerpc64le-linux-musl/libc.so
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