pointer being freed was not allocated

[Paul J. Lucas]

Given this query:

  <a xmlns:prefix="http://www.w3.org/" xmlns:prefix="http://www.w3.org/"/>

one gets:

zorba(54566) malloc: *** error for object 0x7f9c3b488850: pointer being freed was not allocated
*** set a breakpoint in malloc_error_break to debug

Zorba was compiled with:

  cmake -G"Unix Makefiles" -DCMAKE_BUILD_TYPE=Debug ..

This is on a Mac. The stack trace is:

#0 0x00007fff945f9d46 in __kill ()
#1 0x00007fff899a7df0 in abort ()
#2 0x00007fff8997b9b9 in free ()
#3 0x000000010de89319 in zorba::parsenode::~parsenode (this=0x7ffb494887f0) at parsenode_base.h:49
#4 0x000000010dde2ade in zorba::SimpleRCObject::free (this=0x7ffb494887f0) at rchandle.h:144
#5 0x000000010dd9df91 in zorba::SimpleRCObject::removeReference (this=0x7ffb494887f0, lock=0x0) at rchandle.h:154
#6 0x000000010e1748ac in removeReference<zorba::parsenode> (t=0x7ffb494887f0) at rchandle.h:422
#7 0x000000010e18172c in release_hack<zorba::parsenode> (ref=0x7ffb494887f0) at xquery_parser.y:908
#8 0x000000010e177ced in zorba::xquery_parser::yydestruct_ (this=0x7fff51eda988, yymsg=0x0, yytype=529, yyvaluep=0x7ffb49487db8, yylocationp=0x7ffb49487f40) at xquery_parser.y:921
#9 0x000000010e1726ee in zorba::xquery_parser::parse (this=0x7fff51eda988) at /Users/pjl/src/flwor/zorba/repo/bug-1176038/zorba/build/src/compiler/parser/xquery_parser.cpp:11061
#10 0x000000010de46229 in zorba::xquery_driver::parse_stream (this=0x7fff51edaed0, in=@0x7fff51edb0d8, aFilename=@0x7ffb49486438) at /Users/pjl/src/flwor/zorba/repo/bug-1176038/zorba/src/compiler/parser/xquery_driver.cpp:199
#11 0x000000010e108f0c in zorba::XQueryCompiler::parse (this=0x7fff51edb4c0, aXQuery=@0x7ffb49485d80, aFileName=@0x7ffb49486438) at /Users/pjl/src/flwor/zorba/repo/bug-1176038/zorba/src/compiler/api/compiler_api.cpp:230
#12 0x000000010e109af2 in zorba::XQueryCompiler::compile (this=0x7fff51edb4c0, aXQuery=@0x7ffb49485d80, aFileName=@0x7ffb49486438, nextDynamicVarId=@0x7fff51edb5c8) at /Users/pjl/src/flwor/zorba/repo/bug-1176038/zorba/src/compiler/api/compiler_api.cpp:312
#13 0x000000010dd9392d in zorba::XQueryImpl::doCompile (this=0x7ffb494863e0, aQuery=@0x7ffb49485d80, aHints=@0x7fff51edbd38, fork_sctx=true, nextDynamicVarId=@0x7fff51edb5c8) at /Users/pjl/src/flwor/zorba/repo/bug-1176038/zorba/src/api/xqueryimpl.cpp:613
#14 0x000000010dd94334 in zorba::XQueryImpl::compile (this=0x7ffb494863e0, aQuery=@0x7ffb49485d80, aStaticContext=@0x7fff51edcab0, aHints=@0x7fff51edbd38) at /Users/pjl/src/flwor/zorba/repo/bug-1176038/zorba/src/api/xqueryimpl.cpp:541
#15 0x000000010dd28120 in compileAndExecute (zorbaInstance=0x10f6d9d90, properties=@0x7fff51edcf20, staticContext=@0x7fff51edcab0, qfilepath=@0x7fff51edcb90, qfile=@0x7ffb49485d80, outputStream=@0x7fff787d6f10, timing=@0x7fff51edc508) at /Users/pjl/src/flwor/zorba/repo/bug-1176038/zorba/bin/zorbacmd.cpp:776
#16 0x000000010dd2a985 in main (argc=3, argv=0x7fff51edd118) at /Users/pjl/src/flwor/zorba/repo/bug-1176038/zorba/bin/zorbacmd.cpp:1205

[Paul J. Lucas (paul-lucas)]

$ g++ -v
Using built-in specs.
Target: i686-apple-darwin11
Configured with: /private/var/tmp/llvmgcc42/llvmgcc42-2336.11~67/src/configure --disable-checking --enable-werror --prefix=/Applications/Xcode.app/Contents/Developer/usr/llvm-gcc-4.2 --mandir=/share/man --enable-languages=c,objc,c++,obj-c++ --program-prefix=llvm- --program-transform-name=/^[cg][^.-]*$/s/$/-4.2/ --with-slibdir=/usr/lib --build=i686-apple-darwin11 --enable-llvm=/private/var/tmp/llvmgcc42/llvmgcc42-2336.11~67/dst-llvmCore/Developer/usr/local --program-prefix=i686-apple-darwin11- --host=x86_64-apple-darwin11 --target=i686-apple-darwin11 --with-gxx-include-dir=/usr/include/c++/4.2.1
Thread model: posix
gcc version 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2336.11.00)

$ flex --version
flex 2.5.35 Apple(flex-31)

$ bison --version
bison (GNU Bison) 2.7