Disclaimer: I have no minimal reproducing program. The problem occurs at line 458 in mapped_region.hpp: 456 //We calculate the difference between demanded and valid offset 457 std::size_t page_size = this->get_page_size(); 458 m_extra_offset = (offset - (offset / page_size) * page_size); I've found out that page_size gets the value 0. It only seems to happen in my single core computer. It works for other Kubuntu 8.10 systems. The code is needed during so-load. The library is used from two other libraries that are loaded by the program (like a diamond library load). I've been discussing the problem in this forum: http://www.safirsdk.com/forum/phpBB3/viewtopic.php?f=4&t=61 The code is open (available from the site of the forum). It is a whole framework though, not just a small program. I don't know if this is a compiler bug, a Boost bug or a bug in the program. I think that the page size is supposed to be cached, but that this somehow doesn't happen in this setup. I get the error every time. Preloading the library avoids the problem. I.e. starting like this works: LD_PRELOAD=libdots_kernel.so dobexplorer /$