[llvm-bugs] [Bug 41533] New: llvm-cov: "counter mismatch" warnings are handled in ambiguous way

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=41533

            Bug ID: 41533
           Summary: llvm-cov: "counter mismatch" warnings are handled in
                    ambiguous way
           Product: new-bugs
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: mmoroz at google.com
                CC: htmldeveloper at gmail.com, llvm-bugs at lists.llvm.org

This has bitten us several times, the most recent is in
https://github.com/google/oss-fuzz/issues/2330

The problem is that llvm-cov prints a warning, e.g.:


warning: /out/dumps/simple_round_trip.profdata: Function basic block count
change detected (counter mismatch)


and interrupts the execution. IMO it should be either of the following:

1) print an error and interrupt the execution
2) print a warning and continue the execution (if possible?)

Otherwise, we get just a warning but a significantly incomplete report (depends
on the timing / threading, if you're merging multiple dumps).

What do others think?

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