id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
12913	Undefined behaviour in serialization library	John Maddock	Robert Ramey	"Hi Robert, 

while testing multiprecision with clang's sanitizers I found some undefined behaviour in the serialization lib.  The issue can be seen by running serialization's own tests with undefined-behaviour sanitizer turned on - in fact nearly all the tests fail, but most of the failures look like issues with the tests rather than the library.  However building test_binary_xml_archive with clang++ -fsanitize=address -fsanitize=undefined -fno-sanitize-recover=undefined results in:

{{{
../../../boost/archive/detail/interface_oarchive.hpp:47:16: runtime error: downcast of address 0x7ffd0a934990 which does not point to an object of type 'boost::archive::xml_oarchive'
0x7ffd0a934990: note: object is of type 'boost::archive::xml_oarchive_impl<boost::archive::xml_oarchive>'
 fd 7f 00 00  78 ae d3 9c d6 7f 00 00  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  00 00 00 00
              ^~~~~~~~~~~~~~~~~~~~~~~
              vptr for 'boost::archive::xml_oarchive_impl<boost::archive::xml_oarchive>'
SUMMARY: AddressSanitizer: undefined-behavior ../../../boost/archive/detail/interface_oarchive.hpp:47:16 in 

}}}

Which looks like a genuine issue to me.
"	Bugs	assigned	To Be Determined	serialization	Boost Development Trunk	Problem