$ ./a.out
a.out: /usr/include/boost/smart_ptr/scoped_ptr.hpp:99: T* boost::scoped_ptr<T>::operator->() const [with T = mongo::AtomicWord<unsigned int>]: Assertion `px != 0' failed.
Aborted (core dumped)

stack strace

(gdb) backtrace
#0 0x00007ffff6e10bb9 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
#1 0x00007ffff6e13fc8 in __GI_abort () at abort.c:89
#2 0x00007ffff6e09a76 in __assert_fail_base (fmt=0x7ffff6f5b370 "%s%s%s:%u: %s%sAssertion `%s' failed.\n%n", assertion=assertion@entry=0x4687fc "px != 0",
file=file@entry=0x4687d0 "/usr/include/boost/smart_ptr/scoped_ptr.hpp", line=line@entry=99,
function=function@entry=0x4688a0 <boost::scoped_ptr<mongo::AtomicWord<unsigned int> >::operator->() const::_PRETTY_FUNCTION_> "T* boost::scoped_ptr<T>::operator->() const [with T = mongo::AtomicWord<unsigned int>]") at assert.c:92
#3 0x00007ffff6e09b22 in _GI__assert_fail (assertion=0x4687fc "px != 0", file=0x4687d0 "/usr/include/boost/smart_ptr/scoped_ptr.hpp", line=99,
function=0x4688a0 <boost::scoped_ptr<mongo::AtomicWord<unsigned int> >::operator->() const::_PRETTY_FUNCTION_> "T* boost::scoped_ptr<T>::operator->() const [with T = mongo::AtomicWord<unsigned int>]") at assert.c:101
#4 0x000000000041c7c2 in operator-> (this=0x682c90 <mongo::(anonymous namespace)::counter>) at /usr/include/boost/smart_ptr/scoped_ptr.hpp:99
#5 mongo::OID::Increment::next () at src/mongo/bson/oid.cpp:53
#6 0x0https://jira.mongodb.org/browse/CXX#tab-000000000041cbbd in mongo::OID::init (this=0x7fffffffdc00) at src/mongo/bson/oid.cpp:129
#7 0x000000000040ba84 in mongo::OID::gen() ()
#8 0x000000000040c0de in mongo::BSONObjBuilder::genOID() ()
#9 0x000000000040c2ff in mongo::BSONObjBuilder::operator<<(mongo::GENOIDLabeler) ()
#10 0x000000000040b313 in main ()