I found and killed a race-condition; the following three functions need to be changed: atomic::sys::once_dec(...) template<typename T> atomic::sys::once_def_POD<T>::release() Here is the fix: // System API Def namespace atomic { namespace sys { [...] // Dec the refcount if its >= 0. // returns true for the last ref, // otherwise false bool once_dec(refs_t *_this) throw() { refs_t local, cmp, xchg; do { local = ::ac_mb_load_naked(_this); if (local < 0) { return false; } xchg = (local == 1) ? -1 : local - 1; cmp = local; local = ac_atomic_cas_release(_this, local, xchg); } while(cmp != local); std::printf("atomic::sys::once_dec(); - %i\n", local - 1); return (local == 1); } [...] // define is a POD that holds a once POD template<typename T> struct once_def_POD { [...] // Acquires a reference and calls ctor for first ref. // returns pointer to ref, // otherwise NULL type_t* acquire() { type_t *local = 0, *cmp; do { if (local) { ac_atomic_dec_release(&s_this.m_refs); } local = (type_t*)ac_mb_loadptr_depends(&s_this.m_state); if (! local) { // hashed_mutex::guard_t lock(&_this); local = (type_t*)ac_mb_loadptr_depends(&s_this.m_state); if (! once_inc(&s_this.m_refs)) { return 0; } if (! local) { try { local = new type_t; } catch(...) { (void)once_dec(&s_this.m_refs); throw; } dbg_allocs_inc(); std::printf("\n(%p)once_def_POD::acquire(); - %p\n", (void*)this, (void*)local); ac_mb_storeptr_release(&s_this.m_state, local); return local; } } else if(! once_inc(&s_this.m_refs)) { return 0; } cmp = (type_t*)ac_mb_loadptr_depends(&s_this.m_state); } while(local != cmp); return local; } // Releases a reference and calls dtor if last ref. // returns nothing, // otherwise false void release() { type_t *local = (type_t*)ac_mb_loadptr_depends(&s_this.m_state); if (once_dec(&s_this.m_refs)) { ac_mb_storeptr_fence(&s_this.m_state, 0); ac_mb_store_fence(&s_this.m_refs, 0); if (local) { delete local; std::printf("(%p)once_def_POD::release(); - %p\n\n", (void*)this, (void*)local); dbg_allocs_dec(); } } } }; [...] }} // namespace atomic::sys I attached the complete fixed code; once-experimental.cpp. The race-condition allowed a thread to load a state pointer and inc a reference count to a static object that was possibly being dtor'd. I fixed this by zeroing the state pointer and invalidating the reference count when the count dropped to zero. I also had to make a thread double check the load of a state pointer after incrementing a valid reference count. Now I can't seem to find any other race-conditions after this... Can you? ;^) IMHO, this particular algorithm may be worth spending a little time on... 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