Re: grep -A1 -m1 segfaults with multiple line matches bug

[Justin Pryzby]

On Fri, Feb 23, 2007 at 07:28:22PM +0100, Benno Schulenberg wrote:
> Justin Pryzby wrote:
> > On Fri, Feb 23, 2007 at 03:02:14PM +0100, Benno Schulenberg wrote:
> > > Justin Pryzby wrote:
> > > > grep segfaults when invoked like:
> > > >
> > > > { echo h; echo yz; } |grep -A1 -m1 "`echo h; echo zz`"
> >
> > It segfaults on redhat too (with the same upstream version).
> 
> Confirmed on Feisty:
> 
> # { echo h; echo yz; } | grep -A1 -m1 "`echo h; echo zz`"
> h
> Segmentation fault
> 
> 
> # dpkg --list grep | tail -3
> ||/ Name           Version        Description
> +++-==============-==============-============================================
> ii  grep           2.5.1.ds2-6    GNU grep, egrep and fgrep
> 
> 
> You might try to find out which patches both Debian and Red Hat 
> apply that Gentoo doesn't apply to their grep.
debian patch is at:
  http://ftp.debian.org/debian/pool/main/g/grep/grep_2.5.1.ds2-6.diff.gz
  
I couldn't quickly find source packages for the other 2, but interdiff
would be useful here.

> Or build the source 
> package on Debian and enable debugging symbols and get a usable 
> backtrace.
Okay,
#0  0x080518ce in dfaexec ()
#1  0x08058fa6 in EGexecute ()
#2  0x0804af01 in grepfile ()
#3  0x0804cfbe in main ()

Justin