[llvm-bugs] [Bug 38256] New: Is instrumentation profile threading-unaware?

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=38256

            Bug ID: 38256
           Summary: Is instrumentation profile threading-unaware?
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: lebedev.ri at gmail.com
                CC: llvm-bugs at lists.llvm.org

I'm failing to come up with a minimal reproducer right now,
but if a program is built with threading (-fopenmp),
and does some work in threads, then even though the 'llvm-profdata merge'
does not complain, the `llvm-cov show` fails with:
error: <binary>: Failed to load coverage: Malformed coverage data

I *thought* it worked before. Is that expected/intentional behaviour?
This is with llvm/clang trunk.

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