[llvm-bugs] [Bug 45373] New: std::shuffle freeze up

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=45373

            Bug ID: 45373
           Summary: std::shuffle freeze up
           Product: libc++
           Version: unspecified
          Hardware: Macintosh
                OS: MacOS X
            Status: NEW
          Severity: release blocker
          Priority: P
         Component: All Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: sdanie at protonmail.com
                CC: llvm-bugs at lists.llvm.org, mclow.lists at gmail.com

Created attachment 23297
  --> https://bugs.llvm.org/attachment.cgi?id=23297&action=edit
C++ source file showcasing the problem.

Using std::shuffle with a generator that yields the same value for all calls
causes std::shuffle to freeze up. I attached a C++ source file showcasing the
problem.

Replicates on:
Apple clang version 11.0.0 (clang-1100.0.33.12)
Target: x86_64-apple-darwin19.3.0
Thread model: posix

Replication:
clang++ -o bug.exe -std=c++17 bug.cpp && ./bug.exe

The application will freeze when trying to shuffle the elements.
The application will no longer freeze if the 17th element is removed from
samples.

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