touch-packages team mailing list archive

[Douglas Bagnall <douglas@xxxxxxxxxxx>]

This is a dynamic linking/loading problem, not related to libxml2 (or
xsltproc) as first thought. The problem seems to be that executables
with R_386_RELATIVE components are being mapped entirely (including the
heap) into memory between roughly B7000000 and BFFFFFFF, which gives
them roughly 140M to work with. Most programs can cope with that, but
some (e.g. xsltproc performing described task) cannot.

I don't know whether to blame ld-linux.so or the kernel. This is on a
15.04 cloud image with 4GB running on openstack.


** Package changed: libxml2 (Ubuntu) => glibc (Ubuntu)

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https://bugs.launchpad.net/bugs/1471029

Title:
  Segfault in xsltproc on i386

Status in glibc package in Ubuntu:
  New

Bug description:
  Running the Samba autobuild tests on a 15.04 openstack image results
  in a segfault in this command:

  /usr/bin/xsltproc --nonet -o default/docs-xml/manpages/smb.conf.5
  /home/ubuntu/autobuild/b22271/samba/docs-xml/xslt/man.xsl default
  /docs-xml/manpages/smb.conf.5.xml

  I reported this upstream as a bug in xsltproc, but it was found to be
  impossible to reproduce using upstream source on the openstack
  instance:

  https://bugzilla.gnome.org/show_bug.cgi?id=751764

  Comment 8 (https://bugzilla.gnome.org/show_bug.cgi?id=751764#c8) is
  particularly informative.

  The stack trace below shows the segfault actually occurs in libxml's
  xpath evaluation functions. I see no difference between xpath.c in
  upstream 2.9.2 and Ubuntu's version.

  (gdb) bt 12
  #0  0xb760f874 in xmlXPathCompOpEval (ctxt=0xba25d3e8, op=0xb86bc818) at ../../xpath.c:13606
  #1  0xb760f82e in xmlXPathCompOpEval (ctxt=0xba25d3e8, op=0xb86bc890) at ../../xpath.c:13598
  #2  0xb7610244 in xmlXPathCompOpEval (ctxt=0xba25d3e8, op=0xb86bc8b8) at ../../xpath.c:13529
  #3  0xb760f9d6 in xmlXPathCompOpEval (ctxt=0xba25d3e8, op=0xb86bc8e0) at ../../xpath.c:13977
  #4  0xb7612735 in xmlXPathCompOpEval (op=<optimized out>, ctxt=0xba25d3e8) at ../../xpath.c:14552
  #5  xmlXPathRunEval (ctxt=0xba25d3e8, toBool=<optimized out>) at ../../xpath.c:14552
  #6  0xb76171ed in xmlXPathCompiledEvalInternal (toBool=0, resObj=<synthetic pointer>, ctxt=<optimized out>, comp=<optimized out>) at ../../xpath.c:14915
  #7  xmlXPathCompiledEval__internal_alias (comp=0xb866a948, ctx=0xb99bd308) at ../../xpath.c:14978
  #8  0xb7787260 in xsltEvalVariable (ctxt=ctxt@entry=0xb9836560, variable=variable@entry=0xba25d3b0, castedComp=0xb86a4238) at ../../../libxslt/variables.c:903
  #9  0xb778759a in xsltBuildVariable (ctxt=0xb9836560, castedComp=0xb86a4238, tree=0xb86a6978) at ../../../libxslt/variables.c:1759
  #10 0xb7788bfa in xsltParseStylesheetCallerParam (ctxt=0xb86a6978, inst=0xb86a6978) at ../../../libxslt/variables.c:1975
  #11 0xb779b9db in xsltCallTemplate (ctxt=0xb9836560, node=0xb85efed8, inst=0xb86a6880, castedComp=0xb86a4148) at ../../../libxslt/transform.c:4739
  (More stack frames follow...)

  (gdb) bt -5
  #3311 0xb779a7de in xsltProcessOneNode (ctxt=0xb9836560, contextNode=0xb97586a0, withParams=0x0) at ../../../libxslt/transform.c:2097
  #3312 0xb779d818 in xsltApplyStylesheetInternal (style=0xba25d3e8, style@entry=0xb85ee200, doc=0xb86bc7f0, doc@entry=0xb97586a0, params=0xb77ed340 <params>, 
      output=0xb85e13e0 "default/docs-xml/manpages/smb.conf.5", profile=0x0, userCtxt=0xb9836560) at ../../../libxslt/transform.c:6159
  #3313 0xb779df8d in xsltRunStylesheetUser (style=0xb85ee200, doc=0xb97586a0, params=0xb77ed340 <params>, output=0xb85e13e0 "default/docs-xml/manpages/smb.conf.5", SAX=0x0, IObuf=0x0, 
      profile=0x0, userCtxt=0xb9836560) at ../../../libxslt/transform.c:6449
  #3314 0xb77ea12c in xsltProcess (doc=0xb97586a0, cur=0xb85ee200, filename=0xbfd59812 "default/docs-xml/manpages/smb.conf.5.xml") at ../../../xsltproc/xsltproc.c:483
  #3315 0xb77e9298 in main (argc=6, argv=0xbfd58f94) at ../../../xsltproc/xsltproc.c:903

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