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[Matthias Brantner <matthias.brantner@xxxxxxxxxx>]

Did you also try the example (without my fix) and valgrind? I don't get a crash either but valgrind shows that there are serious problems:

==12383== Invalid read of size 4
==12383==    at 0x448BDFF: zorba::SmartPtr<zorba::ItemSequence>::~SmartPtr() (smart_ptr.h:82)
==12383==    by 0x4D25F43: zorba::ExtFunctionCallIteratorState::~ExtFunctionCallIteratorState() (fncall_iterator.cpp:625)
==12383==    by 0x4D2FE87: zorba::StateTraitsImpl<zorba::ExtFunctionCallIteratorState>::destroyState(zorba::PlanState&, unsigned int) (plan_iterator.h:283)
==12383==    by 0x4D2FE4D: zorba::NaryBaseIterator<zorba::ExtFunctionCallIterator, zorba::ExtFunctionCallIteratorState>::closeImpl(zorba::PlanState&) (narybase.h:164)
==12383==    by 0x4D2F815: zorba::Batcher<zorba::ExtFunctionCallIterator>::close(zorba::PlanState&) (plan_iterator.h:563)
==12383==    by 0x4CAFC27: zorba::PlanWrapper::close() (plan_wrapper.cpp:179)
==12383==    by 0x4457EFB: zorba::XQueryImpl::execute(std::ostream&, Zorba_SerializerOptions const*) (xqueryimpl.cpp:1124)
==12383==    by 0x4459B13: zorba::operator<<(std::ostream&, zorba::SmartPtr<zorba::XQuery> const&) (xqueryimpl.cpp:1580)
==12383==    by 0x8068B83: external_function_test_4(zorba::Zorba*) (external_function.cpp:361)
==12383==    by 0x8068E6B: external_function(int, char**) (external_function.cpp:407)
==12383==    by 0x80613C4: main (UnitTests.cpp:270)
==12383==  Address 0x7e00e28 is 0 bytes inside a block of size 24 free'd
==12383==    at 0x4025907: operator delete(void*) (vg_replace_malloc.c:387)
==12383==    by 0x4D2F3F5: zorba::ExtFuncArgItemSequence::~ExtFuncArgItemSequence() (fncall_iterator.cpp:539)
==12383==    by 0x4D25F16: zorba::ExtFunctionCallIteratorState::~ExtFunctionCallIteratorState() (fncall_iterator.cpp:633)
==12383==    by 0x4D2FE87: zorba::StateTraitsImpl<zorba::ExtFunctionCallIteratorState>::destroyState(zorba::PlanState&, unsigned int) (plan_iterator.h:283)
==12383==    by 0x4D2FE4D: zorba::NaryBaseIterator<zorba::ExtFunctionCallIterator, zorba::ExtFunctionCallIteratorState>::closeImpl(zorba::PlanState&) (narybase.h:164)
==12383==    by 0x4D2F815: zorba::Batcher<zorba::ExtFunctionCallIterator>::close(zorba::PlanState&) (plan_iterator.h:563)
==12383==    by 0x4CAFC27: zorba::PlanWrapper::close() (plan_wrapper.cpp:179)
==12383==    by 0x4457EFB: zorba::XQueryImpl::execute(std::ostream&, Zorba_SerializerOptions const*) (xqueryimpl.cpp:1124)
==12383==    by 0x4459B13: zorba::operator<<(std::ostream&, zorba::SmartPtr<zorba::XQuery> const&) (xqueryimpl.cpp:1580)
==12383==    by 0x8068B83: external_function_test_4(zorba::Zorba*) (external_function.cpp:361)
==12383==    by 0x8068E6B: external_function(int, char**) (external_function.cpp:407)
==12383==    by 0x80613C4: main (UnitTests.cpp:270)
-- 
https://code.launchpad.net/~zorba-coders/zorba/bug907872/+merge/86738
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