Hi, I am currently struggling with a crash that I find very hard to isolate. Please see attached three classes I am using (the one not included is FlamTimeMillis, but that is basically just my own time class). In any case, LiveTimer works absolutely fine in my unit tests. It works absolutely fine in both debug and regular release versions. However, when compiled under msvc with compile options /Ox /Oi /Ot /GL and linked with /LTCG (e.g. whole program optimization), it crashes. But only in my main program, and not in any test I try to create. But in the main program, it consistently crashes. According to the logs, it crashes between 3 and 4, e.g. the log looks like this: IN: : LiveTimer: RegisterTimedCallback 2011-12-12 07:02:00.000000: Locked mutex. IN: : LiveTimer: Expires from now -22405.5 A: 2011-12-12 07:02:00.000000 B: 2011-12-12 13:15:25.489000 C: -2.24055e+007 IN: : 1 IN: : 2 IN: : 3 This happens on the very first call to RegisterTimedCallback. Judging from it, it looks like it crashes on timer.expires_from_now(boost::posix_time::seconds((long)secondsToElapse)). I checked that I am in the correct LiveTimer, and that LiveTimer still exists. I tried loading the dump file into WinDbg, and I get the following output: XCEPTION_RECORD: ffffffff -- (.exr 0xffffffffffffffff) ExceptionAddress: 77b68da9 (ntdll!RtlpWaitOnCriticalSection+0x000000bd) ExceptionCode: c0000005 (Access violation) ExceptionFlags: 00000000 NumberParameters: 2 Parameter[0]: 00000001 Parameter[1]: 00000114 Attempt to write to address 00000114 PROCESS_NAME: Test.exe ERROR_CODE: (NTSTATUS) 0xc0000005 - The instruction at 0x%08lx referenced memory at 0x%08lx. The memory could not be %s. EXCEPTION_CODE: (NTSTATUS) 0xc0000005 - The instruction at 0x%08lx referenced memory at 0x%08lx. The memory could not be %s. EXCEPTION_PARAMETER1: 00000001 EXCEPTION_PARAMETER2: 00000114 WRITE_ADDRESS: 00000114 FOLLOWUP_IP: Test!boost::asio::detail::win_iocp_io_service::cancel_timer<boost::asio::time_traits<boost::posix_time::ptime>

+4c [c:\program files (x86)\boost_1_47_0\boost\asio\detail\impl\win_iocp_io_service.hpp @ 117] 0139784c b001 mov al,1

MOD_LIST: <ANALYSIS/> NTGLOBALFLAG: 0 APPLICATION_VERIFIER_FLAGS: 0 FAULTING_THREAD: 000029b8 BUGCHECK_STR: APPLICATION_FAULT_NULL_CLASS_PTR_DEREFERENCE_INVALID_POINTER_WRITE PRIMARY_PROBLEM_CLASS: NULL_CLASS_PTR_DEREFERENCE DEFAULT_BUCKET_ID: NULL_CLASS_PTR_DEREFERENCE LAST_CONTROL_TRANSFER: from 77b68cb8 to 77b68da9 STACK_TEXT: 0032ec44 77b68cb8 00000000 00000000 00000000 ntdll!RtlpWaitOnCriticalSection+0xbd 0032ec6c 0139784c 00953408 654f7f27 0032ecf0 ntdll!RtlEnterCriticalSection+0x150 0032ecac 0139e79a 0095015c 0032f93c ffffffff Test!boost::asio::detail::win_iocp_io_service::cancel_timer<boost::asio::time_traits<boost::posix_time::ptime>

+0x4c [c:\program files (x86)\boost_1_47_0\boost\asio\detail\impl\win_iocp_io_service.hpp @ 117] 0032ecdc 013d9d20 0095015c 0032ed38 00000000 Test!boost::asio::detail::deadline_timer_service<boost::asio::time_traits<boost::posix_time::ptime> ::expires_from_now+0x6a [c:\program files (x86)\boost_1_47_0\boost\asio\detail\deadline_timer_service.hpp @ 159] 0032ecfc 013d948f 0032ed28 654f7e57 0095716c Test!boost::asio::basic_deadline_timer<boost::posix_time::ptime,boost::asio::time_traits<boost::posix_time::ptime>,boost::asio::deadline_timer_service<boost::posix_time::ptime,boost::asio::time_traits<boost::posix_time::ptime>

...

::expires_from_now+0x30 [c:\program files (x86)\boost_1_47_0\boost\asio\basic_deadline_timer.hpp @ 411] 0032ede0 013b1840 0032f900 00950188 0094f970 Test!Flam::Live::LiveTimer::EnqueueTimedCallback+0x33f [c:\users\florian\documents\liveenvv1\trunk\flamlib\live\livetimer.cpp @ 55]

STACK_COMMAND: ~0s; .ecxr ; kb FAULTING_SOURCE_CODE: 113: // If the service has been shut down we silently ignore the cancellation. 114: if (::InterlockedExchangeAdd(&shutdown_, 0) != 0) 115: return 0; 116:

117: mutex::scoped_lock lock(dispatch_mutex_); 118: op_queue<win_iocp_operation> ops; 119: std::size_t n = queue.cancel_timer(timer, ops, max_cancelled); 120: post_deferred_completions(ops); 121: return n; 122: }

SYMBOL_STACK_INDEX: 2 SYMBOL_NAME: Test!boost::asio::detail::win_iocp_io_service::cancel_timer<boost::asio::time_traits<boost::posix_time::ptime>

+4c

The source quoted is from \boost_1_47_0\boost\asio\detail\impl\win_iocp_io_service.hpp. Despite the fact that I can't isolate the error, everything I look at points to a problem somewhere within boost asio, or me not using asio correctly. Anyone any suggestions as to where to go from here? Would be much appreciated. What looks a bit suspicious to me (but that might be entirely wrong), is the line "// If the service has been shut down we silently ignore the cancellation.," because the error happens after the return statement linked to that comment was apparently not executed, and the service has actually been shut down. P.S. I know that I don't need to manage the queue myself and could just let asio handle it, however, eventually I would like to manage the queue more (e.g. edit some timers, cancel others, so I'd prefer to stick to a single timer and manage the queue myself).