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Date:	Mon, 28 Oct 2013 17:17:09 +0100
From:	Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To:	cygwin AT cygwin DOT com, Eric Blake <eblake AT redhat DOT com>
Subject:	Re: cygwin64 1.7.25 "locate" core dumps
Message-ID:	<20131028161709.GB2544@calimero.vinschen.de>
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On Oct 26 13:11, Corinna Vinschen wrote:
> On Oct 25 20:19, Steve wrote:
> > On Mon, Sep 16, 2013 at 6:45 PM,  <Jeff DOT Newmiller AT dnvkema DOT com> wrote:
> > > Could not find reports on core dumps in system programs recently, or =
problems
> > > with the locate tool.
> > >
> > > What I do:
> > >
> > > ---------------------------------------------------------------------=
-----
> > > JNEWM AT FSEL7800 ~
> > > $ locate junk
> > > /home/JNEWM/.cpan/build/Email-Simple-2.102-AftJAF/t/header-junk.t
> > > /home/JNEWM/.cpan/build/Email-Simple-2.102-AftJAF/t/test-mails/junk-i=
n-header
> > > /home/JNEWM/.cpan/build/MIME-tools-5.503-wxTSaY/testmsgs/uu-junk-extr=
acted.ref
> > > /home/JNEWM/.cpan/build/MIME-tools-5.503-wxTSaY/testmsgs/uu-junk-targ=
et.msg
> > > /home/JNEWM/.cpan/build/MIME-tools-5.503-wxTSaY/testmsgs/uu-junk.msg
> > > /home/JNEWM/.cpan/build/MIME-tools-5.503-wxTSaY/testmsgs/uu-junk.ref
> > > Segmentation fault (core dumped)
>=20
> WJFFM.  I created a new updatedb like this:
>=20
>   $ LC_ALL=3DC updatedb --prunefs=3D'nfs smbfs' --prunepaths=3D'/dev /cyg=
drive /proc /tmp /var/cache/ccache /var/spool /var/tmp /usr/bin /usr/lib'
>=20
> > > --- Process 9720, exception c0000005 at 000000010040368B
>                                             ^^^^^^^^^^^^^^^^
>=20
> This is an address within the locate executable itself, line 58 in
> lib/splitstring.c.  Either a wrong pointer or a broken length
> information.
>=20
> Does it work if you regenerate your updatedb, perhaps?
>=20
> Eric, is this perhaps a know bug in locate from findutils 4.5.11?

I found the cause for the crash.  locate from findutils 4.5.11 has
a bug which results in trying to dereference a NULL string pointer.
It happens because it neglects to check the string for being non-NULL
at one point in the source... which, unfortunately, can be hit easily.

Apart from a findutils update to 4.5.12, a temporary workaround is
easy:

  $ export LOCATE_PATH=3D/var/locatedb
  $ locate junk
  [...no crash...]
  $=20


HTH,
Corinna

--=20
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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