The bug is on the table

A few months ago there was an interesting story in the company where I work. One guy from a neighboring department asked me to help him. He encountered one crash after another over the past few days. Unusual in these crashes was that they occurred in different processes and under different circumstances, but within one computer on the test bench (consisted of 5 machines) and with identical symptoms. In all cases it was an access violation caused by illegal instruction pointer.

Here is an example of one of the call stacks:

0:000> knL  # ChildEBP RetAddr  00 0012d7f8 7c90e9ab ntdll!KiFastSystemCallRet 01 0012d7fc 7c8094f2 ntdll!ZwWaitForMultipleObjects+0xc 02 0012d898 7c809c86 kernel32!WaitForMultipleObjectsEx+0x12c 03 0012d8b4 6945763c kernel32!WaitForMultipleObjects+0x18 04 0012e248 694582b1 faultrep!StartDWException+0x5df 05 0012f2bc 7c863059 faultrep!ReportFault+0x533 06 0012f530 7c36e289 kernel32!UnhandledExceptionFilter+0x4cf 07 0012f54c 0041b84f msvcr71!_XcptFilter+0x15f 08 0012f558 7c363943 radar!WinMainCRTStartup+0x1d7 09 0012f580 7c9037bf msvcr71!_except_handler3+0x61 0a 0012f5a4 7c90378b ntdll!ExecuteHandler2+0x26 0b 0012f654 7c90eafa ntdll!ExecuteHandler+0x24 0c 0012f654 fc910d93 ntdll!KiUserExceptionDispatcher+0xe WARNING: Frame IP not in any known module. Following frames may be wrong. 0d 0012f950 1f4d5318 0xfc910d93 0e 0012fa10 7c363593 0x1f4d5318 0f 0012fa58 087e6827 msvcr71!free+0xc3 10 0012fa8c 087e6f41 NaviRadarRendererPlain!std::vector,std::allocator > >::_Insert_n+0x147 11 0012fafc 087e46f1 NaviRadarRendererPlain!TScanlines::calculate+0x5d1 12 0012fc2c 087e418e NaviRadarRendererPlain!TRadarToScreen_::RenderBlock+0x521 13 0012fc64 087e2378 NaviRadarRendererPlain!TRadarToScreen_::Render+0x16e 14 0012fc88 087c4cf0 NaviRadarRendererPlain!n_d3d_render::renderer_t::render+0x68 15 0012fce0 03d5c5e7 NaviRadarLayer!TRadarLayerImpl::Draw+0x360 16 0012fd1c 03d55c8e TotUser!TRadarManager_::Update+0x77 17 0012fd4c 087c821a TotUser!TCrtPanel_::InvalidateRadar+0xbe 18 0012fd54 10ac8959 NaviRadarLayer!TRadarLayerImpl::OnVideoBlockReceived+0x7a 19 0012fd7c 10ac8ab6 TkRadar20!IAdviseHostImpl::TypedForEach+0x49 1a 0012fd90 10ac8e88 TkRadar20!RadarConnector::VideoBlockReceived+0x26 1b 0012fda0 77d48709 TkRadar20!detail::WndProc+0x48 1c 0012fdcc 77d487eb user32!InternalCallWinProc+0x28 1d 0012fe34 77d489a5 user32!UserCallWinProcCheckWow+0x150 1e 0012fe94 77d4bccc user32!DispatchMessageWorker+0x306 1f 0012fea4 7c1b1645 user32!DispatchMessageA+0xf 20 0012feb4 7c1b1357 mfc71!AfxInternalPumpMessage+0x3e 21 0012fed0 0040acc0 mfc71!CWinThread::Run+0x54 22 0012ff08 7c1ae5f1 radar!CECSNTApp::Run+0x30 23 0012ff18 0041b7fd mfc71!AfxWinMain+0x68 24 0012ffc0 7c816d4f radar!WinMainCRTStartup+0x185 25 0012fff0 00000000 kernel32!BaseProcessStart+0x23