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Date: Fri, 11 Jul 2014 21:03:40 -0700
From: Isaac Dunham <ibid.ag@gmail.com>
To: Rich Felker <dalias@libc.org>
Cc: musl@lists.openwall.com, Alpine <alpine-devel@lists.alpinelinux.org>
Subject: Solved: Re: [musl][alpine-devel] Attempting to debug C++ library and
 command via valgrind
Message-ID: <20140712040339.GB1789@newbook>
References: <20140709043946.GA1787@newbook>
 <CAEuRe+2zBM3L+Vhfiqgpnq0cm7ZF1=5ZTBo-F-iP9UsNTHG-1A@mail.gmail.com>
 <20140710041348.GA4689@newbook>
 <20140710044716.GT179@brightrain.aerifal.cx>
 <20140710065006.GB4777@newbook>
 <20140711033933.GW179@brightrain.aerifal.cx>
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In-Reply-To: <20140711033933.GW179@brightrain.aerifal.cx>
User-Agent: Mutt/1.5.23 (2014-03-12)

Hello,
Just so everyone knows, someone on the sword-devel list (the person who
asked me for valgrind output) found and fixed the bug.
Rich, thanks for mentioning strace; that ended up being the key.

On Thu, Jul 10, 2014 at 11:39:34PM -0400, Rich Felker wrote:
> On Wed, Jul 09, 2014 at 11:50:08PM -0700, Isaac Dunham wrote:
> > On Thu, Jul 10, 2014 at 12:47:16AM -0400, Rich Felker wrote:
<snip> 
> > > But I think you're getting ahead of things. What
> > > actual failure is the program exhibiting? (Crash? Incorrect or no
> > > output? Error messages?) Depending on what happens, a gdb backtrace or
> > > an strace log may be more useful than the valgrind output.
> > _llseek(3, 164840, [164840], SEEK_SET)  = 0
> > read(3, "\23\0\0\0", 4)                 = 4
> > read(3, "\207\204\f\0", 4)              = 4
> > read(3, "\34\1", 2)                     = 2
> > _llseek(3, 164850, [164850], SEEK_SET)  = 0
> > read(3, "\23\0\0\0", 4)                 = 4
> > read(3, "\243\205\f\0", 4)              = 4
> > read(3, "'\2", 2)                       = 2
> > _llseek(3, 164850, [164850], SEEK_SET)  = 0
> > read(3, "\23\0\0\0", 4)                 = 4
> > read(3, "\243\205\f\0", 4)              = 4
> > read(3, "'\2", 2)                       = 2
> > _llseek(3, 164850, [164850], SEEK_SET)  = 0
> > read(3, "\23\0\0\0", 4)                 = 4
> > read(3, "\243\205\f\0", 4)              = 4
> > read(3, "'\2", 2)                       = 2
> > munmap(0xb56af000, 1024000)             = 0
> > munmap(0xb57a9000, 180224)              = 0
> > munmap(0xb534d000, 1024000)             = 0
> > close(4)                                = 0
> > close(5)                                = 0
> > close(3)                                = 0
> > writev(1, [{"Psalms 117:2: For his merciful k"..., 246}, {NULL, 0}], 2Psalms 117:2: For his merciful kindness is great toward us: and the truth of the LORD endureth for ever. Praise ye the LORD. 
> > : For his merciful kindness is great toward us: and the truth of the LORD endureth for ever. Praise ye the LORD. 
> > (KJV)
> > ) = 246
> > 
> > Which looks like it's going through a loop twice when it reaches the exit condition.
> 
> The fact that it's using writev suggests strongly that the output is
> being written via musl's stdio (to stdout, since it's fd #1) rather
> than via some other mechanism, but it could be C++ iostreams using
> stdio as their backend. It's hard to say whether this is due to
> corruption of the FILE state or the actual calling code writing the
> output twice.
It turned out to be the calling code reading the last verse twice;
the closing curly braces were misplaced.

Thanks,
Isaac Dunham



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