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https://issues.apache.org/jira/browse/XERCESC-2153?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16963562#comment-16963562
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martin goodall commented on XERCESC-2153:
-----------------------------------------
I found a bug in win32transservice.cpp. the variables used in calls to
(::Reg.....) to get registry items are too small, causing memory to get
overwritten. This caused random behavior on my system when running in parallel
as it ended up overwriting a few bytes of the hashed memory allocations. The
problem is hard to reproduce predictably as it only overwrites a few bytes and
it was overwriting pointers in the hash tables.
> Tests can fail on Windows when run in parallel
> ----------------------------------------------
>
> Key: XERCESC-2153
> URL: https://issues.apache.org/jira/browse/XERCESC-2153
> Project: Xerces-C++
> Issue Type: Wish
> Components: Samples/Tests
> Affects Versions: 3.2.1
> Environment: Windows 10 x64 with VS2017 x64 build of Xerces-C++ 3.2.2
> prerelease.
> Reporter: Roger Leigh
> Assignee: Roger Leigh
> Priority: Minor
> Labels: test-fail, windows
> Fix For: 3.2.2
>
>
> Tests always pass when run serially, so I don't see this as a blocker for
> 3.2.2 unless it's indicative of a very long-standing problem internally in
> Xerces rather than that the tests were not originally written with parallel
> execution in mind.
> When running "ctest -jn" to run tests in parallel, tests can randomly fail.
> Looks like an interaction between tests when run at the same time. Some
> resource contention?
> The following is a reduced testcase, where I've found two tests which
> interact badly (there may be others). Both are using personal.xml as input.
> {{D:\xerces-c-3.2.2\b>ctest -C Release -j 4 -R "DOMPrint3|StdInParse2"}}
> {{Test project D:/xerces-c-3.2.2/b}}
> {{ Start 66: DOMPrint3}}
> {{ Start 70: StdInParse2}}
> {{1/2 Test #66: DOMPrint3 ........................***Failed 0.07 sec}}
> {{2/2 Test #70: StdInParse2 ...................... Passed 0.08 sec}}{{50%
> tests passed, 1 tests failed out of 2}}{{Total Test time (real) = 0.11
> sec}}{{The following tests FAILED:}}
> {{ 66 - DOMPrint3 (Failed)}}
> {{Errors while running CTest}}
> I can't reproduce on Linux, so it may well be Windows-specific due to file
> locking preventing multiple readers of a file? Is it due to one process
> having it held open on stdin while the other tries to open it. Running
> multiple StdInParse[123] tests or multiple DOMPrint[123] tests does not
> result in failure. But when the two are combined, it's always DOMPrint that
> fails; is it the open mode being used?
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