Use of 'concurrency::parallel_for_each' with the Multi-threaded Debug (/MTd) run-time library causes unhandled exceptions on program exit

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Bugzilla Link	PR34976
Status	NEW
Importance	P normal
Reported by	Owen Reynolds (gbreynoo@gmail.com)
Reported on	2017-10-17 06:31:54 -0700
Last modified on	2018-02-16 01:00:51 -0800
Version	trunk
Hardware	PC Windows NT
CC	grimar@accesssoftek.com, llvm-bugs@lists.llvm.org
Fixed by commit(s)
Attachments	main.cpp (948 bytes, text/plain) build_main.bat (446 bytes, text/plain) create_issue.bat (93 bytes, text/plain) issue_run.bat (108 bytes, text/plain)
Blocks
Blocked by
See also

Use of 'parallel_for_each' when compiling with the Visual C++ Compiler uses the
Windows Concurrency Library. We have found that when compiling with /MTd, the
use of 'concurrency::parallel_for_each' can cause unhandled exceptions when the
program is exiting.

This is problematic when debugging or testing.

This issue does not occur when compiling to release or DLL run-time libraries,
and the issue has been raised with Microsoft. However in the meantime we
suggest the removal of this MSVC specific functionality and use the generic
implementation.

To reproduce this issue consistently:
- Create an an executable with calls to 'parallel_for_each'
- Run executable multiple times in parallel
- The exit codes will be as below:
 -1073741819 = C0000005 = Access Violation exception

See attached files for example

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Attached main.cpp (948 bytes, text/plain): Example cpp file

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Attached build_main.bat (446 bytes, text/plain): Example Compilation Command Line

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Attached create_issue.bat (93 bytes, text/plain): Example used for reproducible

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Attached issue_run.bat (108 bytes, text/plain): Second example used for reproducible

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Due to a change in Microsoft's issue reporting system, the problem has been resubmitted:

https://developercommunity.visualstudio.com/content/problem/198027/use-of-concurrencyparallel-for-each-with-the-multi.html