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Drew already knows about this failure, but want to make sure it's logged for tracking. TASK TASK HISTORY [MongoDFixture:job0] 2015-10-01T18:40:04.073+0000 I CONTROL [ftdc] *** C runtime error: C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\INCLUDE\vector(1201) : Assertion failed: vector subscript out of range, terminating [MongoDFixture:job0] 2015-10-01T18:40:04.073+0000 I - [ftdc] Fatal Assertion 17006 [MongoDFixture:job0] 2015-10-01T18:40:04.073+0000 I CONTROL [ftdc] *** unhandled exception 0x80000003 at 0x000007FEFCDA33B2, terminating [MongoDFixture:job0] 2015-10-01T18:40:04.073+0000 I CONTROL [ftdc] *** stack trace for unhandled exception: [MongoDFixture:job0] 2015-10-01T18:40:04.802+0000 I CONTROL [ftdc] KERNELBASE.dll DebugBreak+0x2 [MongoDFixture:job0] 2015-10-01T18:40:04.803+0000 I CONTROL [ftdc] mongod.exe ...\src\mongo\util\assert_util.cpp(171) mongo::fassertFailed+0xce [MongoDFixture:job0] 2015-10-01T18:40:04.803+0000 I CONTROL [ftdc] mongod.exe ...\src\mongo\util\stacktrace_windows.cpp(282) mongo::crtDebugCallback+0x15f [MongoDFixture:job0] 2015-10-01T18:40:04.803+0000 I CONTROL [ftdc] mongod.exe f:\dd\vctools\crt\crtw32\misc\dbgrptt.c(609) _VCrtDbgReportW+0x7c1 [MongoDFixture:job0] 2015-10-01T18:40:04.803+0000 I CONTROL [ftdc] mongod.exe f:\dd\vctools\crt\crtw32\misc\dbgrpt.c(263) _CrtDbgReportWV+0x50 [MongoDFixture:job0] 2015-10-01T18:40:04.803+0000 I CONTROL [ftdc] mongod.exe f:\dd\vctools\crt\crtw32\misc\dbgrpt.c(279) _CrtDbgReportW+0x60 [MongoDFixture:job0] 2015-10-01T18:40:04.803+0000 I CONTROL [ftdc] mongod.exe f:\dd\vctools\crt\crtw32\stdcpp\stdthrow.cpp(13) std::_Debug_message+0x40 [MongoDFixture:job0] 2015-10-01T18:40:04.803+0000 I CONTROL [ftdc] mongod.exe c:\program files (x86)\microsoft visual studio 12.0\vc\include\vector(1202) std::vector >::operator[]+0x3a [MongoDFixture:job0] 2015-10-01T18:40:04.803+0000 I CONTROL [ftdc] mongod.exe ...\src\mongo\db\ftdc\compressor.cpp(82) mongo::FTDCCompressor::addSample+0x32b [MongoDFixture:job0] 2015-10-01T18:40:04.803+0000 I CONTROL [ftdc] mongod.exe ...\src\mongo\db\ftdc\file_writer.cpp(149) mongo::FTDCFileWriter::writeSample+0x4b [MongoDFixture:job0] 2015-10-01T18:40:04.803+0000 I CONTROL [ftdc] mongod.exe ...\src\mongo\db\ftdc\file_manager.cpp(284) mongo::FTDCFileManager::writeSampleAndRotateIfNeeded+0x42 [MongoDFixture:job0] 2015-10-01T18:40:04.803+0000 I CONTROL [ftdc] mongod.exe ...\src\mongo\db\ftdc\controller.cpp(199) mongo::FTDCController::doLoop+0x373 [MongoDFixture:job0] 2015-10-01T18:40:04.803+0000 I CONTROL [ftdc] mongod.exe c:\program files (x86)\microsoft visual studio 12.0\vc\include\thr\xthread(188) std::_LaunchPad >::_Go+0x1c [MongoDFixture:job0] 2015-10-01T18:40:04.803+0000 I CONTROL [ftdc] mongod.exe f:\dd\vctools\crt\crtw32\stdcpp\thr\threadcall.cpp(28) _Call_func+0x29 [MongoDFixture:job0] 2015-10-01T18:40:04.803+0000 I CONTROL [ftdc] mongod.exe f:\dd\vctools\crt\crtw32\startup\threadex.c(376) _callthreadstartex+0x25 [MongoDFixture:job0] 2015-10-01T18:40:04.803+0000 I CONTROL [ftdc] mongod.exe f:\dd\vctools\crt\crtw32\startup\threadex.c(359) _threadstartex+0xe7 [MongoDFixture:job0] 2015-10-01T18:40:04.803+0000 I CONTROL [ftdc] kernel32.dll BaseThreadInitThunk+0xd [MongoDFixture:job0] 2015-10-01T18:40:04.803+0000 I - [ftdc] [MongoDFixture:job0] 2015-10-01T18:40:04.804+0000 I CONTROL [ftdc] writing minidump diagnostic file C:\data\mci\src\mongod.2015-10-01T18-40-04.mdmp

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xgen-internal-githook commented on Fri, 2 Oct 2015 21:58:38 +0000: Author: {u'username': u'acmorrow', u'name': u'Andrew Morrow', u'email': u'acm@mongodb.com'} Message: SERVER-20750 Require at least one delta sample in each chunk Branch: master https://github.com/mongodb/mongo/commit/1fd64cee88562e77883db5b75ee666a55b15e748 acm commented on Fri, 2 Oct 2015 21:37:57 +0000: The issue is actually that the prior test, ftdc_params, sets the maximum number of samples per chunk to 1. However, in the fix for SERVER-20453, we made it so that so the number of deltas is computed as one less than this value. Effectively, that meant that the number of expected delta encoded samples was zero, which the compressor.cpp code was not prepared to handle. Rather than refactoring the code to handle this edge case, for now we can just restrict the minimum number of samples to be two.

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