Hi I'm using Boost 1.46.1 asio for doing serial communication. About 1/1000 times when I run the poll_one I get this segmentation fault: Program received signal SIGSEGV, Segmentation fault. 0x0000000000434a7a in boost::asio::detail::reactor_op::perform (this=0x402010af1010004) at /usr/include/boost-1_46/boost/asio/detail/reactor_op.hpp:40 40 return perform_func_(this); (gdb) bt #0 0x0000000000434a7a in boost::asio::detail::reactor_op::perform (this=0x402010af1010004) at /usr/include/boost-1_46/boost/asio/detail/reactor_op.hpp:40 #1 0x0000000000435da6 in boost::asio::detail::epoll_reactor::run (this=0x6625c0, block=false, ops=...) at /usr/include/boost-1_46/boost/asio/detail/impl/epoll_reactor.ipp:286 #2 0x0000000000436a24 in boost::asio::detail::task_io_service::do_one (this=0x6624e0, lock=..., this_idle_thread=0x0) at /usr/include/boost-1_46/boost/asio/detail/impl/task_io_service.ipp:264 #3 0x0000000000436612 in boost::asio::detail::task_io_service::poll_one (this=0x6624e0, ec=...) at /usr/include/boost-1_46/boost/asio/detail/impl/task_io_service.ipp:188 #4 0x0000000000436e65 in boost::asio::io_service::poll_one (this=0x7fffffffe240, ec=...) at /usr/include/boost-1_46/boost/asio/impl/io_service.ipp:103 #5 0x000000000043b69b in CcTalkPort::receive (this=0x7fffffffe240) at /home/awn/git/gamblify/hardware/gmbio/software/test/ccTalkScan.cxx:382 #6 0x000000000043b7dc in CcTalkPort::receive (this=0x7fffffffe240, size=5) at /home/awn/git/gamblify/hardware/gmbio/software/test/ccTalkScan.cxx:396 #7 0x000000000043bcb5 in CcTalkPort::_ask (this=0x7fffffffe240, req=...) at /home/awn/git/gamblify/hardware/gmbio/software/test/ccTalkScan.cxx:411 #8 0x000000000043ac6e in CcTalkPort::ask (this=0x7fffffffe240, req=...) at /home/awn/git/gamblify/hardware/gmbio/software/test/ccTalkScan.cxx:317 #9 0x000000000043daef in CcTalkDevice::ask_hex (this=0x7fffffffe300, v=..., m=..., s=...) at /home/awn/git/gamblify/hardware/gmbio/software/test/ccTalkScan.cxx:583 #10 0x000000000043ce69 in CcTalkDevice::request_software_revision (this=0x7fffffffe300) at /home/awn/git/gamblify/hardware/gmbio/software/test/ccTalkScan.cxx:507 #11 0x000000000043c57f in CcTalkDevice::coreInfo (this=0x7fffffffe300) at /home/awn/git/gamblify/hardware/gmbio/software/test/ccTalkScan.cxx:459 #12 0x00000000004325ff in main (argc=1, argv=0x7fffffffe528) at /home/awn/git/gamblify/hardware/gmbio/software/test/ccTalkScan.cxx:820 Here is the snippet where I call it: while(1) { io_service.reset(); io_service.poll_one(ec); if ( read_result ) { timer.cancel(); return; } else if ( timer_result ) { throw CcTalkTimeOutException(); } } Any hints on how to debug this? -- Allan W. Nielsen