Explicit use of the child axis in the XSLT stylesheet below causes
a SIGSEGV with xsltproc built from libxslt-1.0.1-1.src.rpm.

The XSLT stylesheet (problem.xsl), a sample XML document (problem.xml), 
and a backtrace appear below.  With those files, the following command
illustrates the problem:

  $ xsltproc problem.xsl problem.xml 
  Segmentation fault (core dumped)

I have looked through the function xsltCompileStepPattern in
libxslt/pattern.c and suspect that something has gone wrong by
the time the function xsltGetQNameURI is called on line 1269.

===================================================================
  <?xml version="1.0"?>
  <xsl:stylesheet version="1.0"
                  xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
    <xsl:preserve-space elements="*"/>
    <xsl:output method="xml"/>
    <xsl:template match="child::foo">
      <bar/>
    </xsl:template>
  </xsl:stylesheet>
===================================================================

===================================================================
  <?xml version="1.0"?>
  <foo/>
===================================================================


===================================================================

+ Trace 8364