function basic block count change detected (counter mismatch)

[jayvdb]

I didnt see any issue about this, so apologies if it has been addressed already.

This has been happening from June to August - we install Rust using

      - name: Install Rust nightly with rustfmt
        uses: actions-rust-lang/[email protected]
        with:
          toolchain: nightly
          components: rustfmt,llvm-tools-preview

When I run cargo-llvm-cov, I get 850 lines like the following, always showing external deps (i.e. not workspace members)

> cargo +nightly llvm-cov test --no-clean --include-build-script --branch --cobertura --output-path coverage.xml --workspace --no-fail-fast --all-features
<compiling>
<running all tests successfully>
/__w/<private project>/<private project>/target/llvm-cov-target/<private project>-14224-14371980818727411745_0.profraw: _RNvMs2_NtNtCsiwUvRo5Y02h_12regex_syntax3ast5printINtB5_6WriterQNtNtCsiTKmwCdMyvL_4core3fmt9FormatterE14fmt_repetitionB9_: function basic block count change detected (counter mismatch)
Make sure that all profile data to be merged is generated from the same binary.
/__w/<private project>/<private project>/target/llvm-cov-target/<private project>-14224-14371980818727411745_0.profraw: _RNvMs2_NtNtCsiwUvRo5Y02h_12regex_syntax3ast5printINtB5_6WriterQNtNtCsiTKmwCdMyvL_4core3fmt9FormatterE14fmt_class_perlB9_: function basic block count change detected (counter mismatch)
/__w/<private project>/<private project>/target/llvm-cov-target/<private project>-14224-14371980818727411745_0.profraw: _RNvMs2_NtNtCsiwUvRo5Y02h_12regex_syntax3ast5printINtB5_6WriterQNtNtCsiTKmwCdMyvL_4core3fmt9FormatterE15fmt_class_asciiB9_: function basic block count change detected (counter mismatch)
/__w/<private project>/<private project>/target/llvm-cov-target/<private project>-14224-14371980818727411745_0.profraw: _RNvMs3_NtNtCsiwUvRo5Y02h_12regex_syntax3ast5parseINtB5_7ParserIQNtB5_6ParserE24parse_counted_repetitionB9_: function basic block count change detected (counter mismatch)
/__w/<private project>/<private project>/target/llvm-cov-target/<private project>-14275-14371980818727411745_0.profraw: _RNvMs2_NtNtCsiwUvRo5Y02h_12regex_syntax3ast5printINtB5_6WriterQNtNtCsiTKmwCdMyvL_4core3fmt9FormatterE14fmt_repetitionB9_: function basic block count change detected (counter mismatch)
/__w/<private project>/<private project>/target/llvm-cov-target/<private project>-14275-14371980818727411745_0.profraw: _RNvMs2_NtNtCsiwUvRo5Y02h_12regex_syntax3ast5printINtB5_6WriterQNtNtCsiTKmwCdMyvL_4core3fmt9FormatterE14fmt_class_perlB9_: function basic block count change detected (counter mismatch)
/__w/<private project>/<private project>/target/llvm-cov-target/<private project>-14275-14371980818727411745_0.profraw: _RNvMs2_NtNtCsiwUvRo5Y02h_12regex_syntax3ast5printINtB5_6WriterQNtNtCsiTKmwCdMyvL_4core3fmt9FormatterE15fmt_class_asciiB9_: function basic block count change detected (counter mismatch)
/__w/<private project>/<private project>/target/llvm-cov-target/<private project>-14275-14371980818727411745_0.profraw: _RNvMs3_NtNtCsiwUvRo5Y02h_12regex_syntax3ast5parseINtB5_7ParserIQNtB5_6ParserE24parse_counted_repetitionB9_: function basic block count change detected (counter mismatch)
/__w/<private project>/<private project>/target/llvm-cov-target/<private project>-14405-14371980818727411745_0.profraw: _RNvMs2_NtNtCsiwUvRo5Y02h_12regex_syntax3ast5printINtB5_6WriterQNtNtCsiTKmwCdMyvL_4core3fmt9FormatterE14fmt_repetitionB9_: function basic block count change detected (counter mismatch)
/__w/<private project>/<private project>/target/llvm-cov-target/<private project>-14405-14371980818727411745_0.profraw: _RNvMs2_NtNtCsiwUvRo5Y02h_12regex_syntax3ast5printINtB5_6WriterQNtNtCsiTKmwCdMyvL_4core3fmt9FormatterE14fmt_class_perlB9_: function basic block count change detected (counter mismatch)
/__w/<private project>/<private project>/target/llvm-cov-target/<private project>-14405-14371980818727411745_0.profraw: _RNvMs2_NtNtCsiwUvRo5Y02h_12regex_syntax3ast5printINtB5_6WriterQNtNtCsiTKmwCdMyvL_4core3fmt9FormatterE15fmt_class_asciiB9_: function basic block count change detected (counter mismatch)
/__w/<private project>/<private project>/target/llvm-cov-target/<private project>-14405-14371980818727411745_0.profraw: _RNvMs3_NtNtCsiwUvRo5Y02h_12regex_syntax3ast5parseINtB5_7ParserIQNtB5_6ParserE24parse_counted_repetitionB9_: function basic block count change detected (counter mismatch)
/__w/<private project>/<private project>/target/llvm-cov-target/<private project>-15426-11873273069187591105_0.profraw: _RNvMNtCsivMaHCyvWuZ_5bytes9bytes_mutNtB2_8BytesMut13reserve_inner: function basic block count change detected (counter mismatch)
/__w/<private project>/<private project>/target/llvm-cov-target/<private project>-15426-11873273069187591105_0.profraw: _RNvMs2_NtNtCsiwUvRo5Y02h_12regex_syntax3ast5printINtB5_6WriterQNtNtCsiTKmwCdMyvL_4core3fmt9FormatterE14fmt_repetitionB9_: function basic block count change detected (counter mismatch)
/__w/<private project>/<private project>/target/llvm-cov-target/<private project>-15426-11873273069187591105_0.profraw: _RNvMs2_NtNtCsiwUvRo5Y02h_12regex_syntax3ast5printINtB5_6WriterQNtNtCsiTKmwCdMyvL_4core3fmt9FormatterE14fmt_class_perlB9_: function basic block count change detected (counter mismatch)
/__w/<private project>/<private project>/target/llvm-cov-target/<private project>-15426-11873273069187591105_0.profraw: _RNvMs2_NtNtCsiwUvRo5Y02h_12regex_syntax3ast5printINtB5_6WriterQNtNtCsiTKmwCdMyvL_4core3fmt9FormatterE15fmt_class_asciiB9_: function basic block count change detected (counter mismatch)
/__w/<private project>/<private project>/target/llvm-cov-target/<private project>-15426-11873273069187591105_0.profraw: _RNvMs3_NtNtCsiwUvRo5Y02h_12regex_syntax3ast5parseINtB5_7ParserIQNtB5_6ParserE24parse_counted_repetitionB9_: function basic block count change detected (counter mismatch)
/__w/<private project>/<private project>/target/llvm-cov-target/<private project>-15798-8961453619814511421_0.profraw: _RNvMs2_NtNtCsiwUvRo5Y02h_12regex_syntax3ast5printINtB5_6WriterQNtNtCsiTKmwCdMyvL_4core3fmt9FormatterE14fmt_repetitionB9_: function basic block count change detected (counter mismatch)
/__w/<private project>/<private project>/target/llvm-cov-target/<private project>-15798-8961453619814511421_0.profraw: _RNvMs2_NtNtCsiwUvRo5Y02h_12regex_syntax3ast5printINtB5_6WriterQNtNtCsiTKmwCdMyvL_4core3fmt9FormatterE14fmt_class_perlB9_: function basic block count change detected (counter mismatch)
/__w/<private project>/<private project>/target/llvm-cov-target/<private project>-15798-8961453619814511421_0.profraw: _RNvMs2_NtNtCsiwUvRo5Y02h_12regex_syntax3ast5printINtB5_6WriterQNtNtCsiTKmwCdMyvL_4core3fmt9FormatterE15fmt_class_asciiB9_: function basic block count change detected (counter mismatch)
/__w/<private project>/<private project>/target/llvm-cov-target/<private project>-15798-8961453619814511421_0.profraw: _RNvMs3_NtNtCsiwUvRo5Y02h_12regex_syntax3ast5parseINtB5_7ParserIQNtB5_6ParserE24parse_counted_repetitionB9_: function basic block count change detected (counter mismatch)
/__w/<private project>/<private project>/target/llvm-cov-target/<private project>-15798-8961453619814511421_0.profraw: _RNvMNtCsivMaHCyvWuZ_5bytes9bytes_mutNtB2_8BytesMut13reserve_inner: function basic block count change detected (counter mismatch)
/__w/<private project>/<private project>/target/llvm-cov-target/<private project>-15798-8961453619814511421_0.profraw: _RNvXsk_Cs4MxhT0zqSGQ_10num_traitsfNtB5_3Num14from_str_radix: function basic block count change detected (counter mismatch)
/__w/<private project>/<private project>/target/llvm-cov-target/<private project>-15798-8961453619814511421_0.profraw: _RNvXsl_Cs4MxhT0zqSGQ_10num_traitsdNtB5_3Num14from_str_radix: function basic block count change detected (counter mismatch)
/__w/<private project>/<private project>/target/llvm-cov-target/<private project>-15798-8961453619814511421_0.profraw: _RNvNtCs562dRZQyZzR_14unsafe_libyaml6reader25yaml_parser_update_buffer: function basic block count change detected (counter mismatch)
/__w/<private project>/<private project>/target/llvm-cov-target/<private project>-15798-8961453619814511421_0.profraw: _RNvNtCs562dRZQyZzR_14unsafe_libyaml6parser22yaml_parser_parse_node: function basic block count change detected (counter mismatch)
/__w/<private project>/<private project>/target/llvm-cov-target/<private project>-17081-11873273069187591105_0.profraw: _RNvMNtCsivMaHCyvWuZ_5bytes9bytes_mutNtB2_8BytesMut13reserve_inner: function basic block count change detected (counter mismatch)
/__w/<private project>/<private project>/target/llvm-cov-target/<private project>-17081-11873273069187591105_0.profraw: _RNvMs2_NtNtCsiwUvRo5Y02h_12regex_syntax3ast5printINtB5_6WriterQNtNtCsiTKmwCdMyvL_4core3fmt9FormatterE14fmt_repetitionB9_: function basic block count change detected (counter mismatch)
/__w/<private project>/<private project>/target/llvm-cov-target/<private project>-17081-11873273069187591105_0.profraw: _RNvMs2_NtNtCsiwUvRo5Y02h_12regex_syntax3ast5printINtB5_6WriterQNtNtCsiTKmwCdMyvL_4core3fmt9FormatterE14fmt_class_perlB9_: function basic block count change detected (counter mismatch)
/__w/<private project>/<private project>/target/llvm-cov-target/<private project>-17081-11873273069187591105_0.profraw: _RNvMs2_NtNtCsiwUvRo5Y02h_12regex_syntax3ast5printINtB5_6WriterQNtNtCsiTKmwCdMyvL_4core3fmt9FormatterE15fmt_class_asciiB9_: function basic block count change detected (counter mismatch)
/__w/<private project>/<private project>/target/llvm-cov-target/<private project>-17081-11873273069187591105_0.profraw: _RNvMs3_NtNtCsiwUvRo5Y02h_12regex_syntax3ast5parseINtB5_7ParserIQNtB5_6ParserE24parse_counted_repetitionB9_: function basic block count change detected (counter mismatch)
/__w/<private project>/<private project>/target/llvm-cov-target/<private project>-17399-11873273069187591105_0.profraw: _RNvMNtCsivMaHCyvWuZ_5bytes9bytes_mutNtB2_8BytesMut13reserve_inner: function basic block count change detected (counter mismatch)
/__w/<private project>/<private project>/target/llvm-cov-target/<private project>-17399-11873273069187591105_0.profraw: _RNvMs2_NtNtCsiwUvRo5Y02h_12regex_syntax3ast5printINtB5_6WriterQNtNtCsiTKmwCdMyvL_4core3fmt9FormatterE14fmt_repetitionB9_: function basic block count change detected (counter mismatch)
/__w/<private project>/<private project>/target/llvm-cov-target/<private project>-17399-11873273069187591105_0.profraw: _RNvMs2_NtNtCsiwUvRo5Y02h_12regex_syntax3ast5printINtB5_6WriterQNtNtCsiTKmwCdMyvL_4core3fmt9FormatterE14fmt_class_perlB9_: function basic block count change detected (counter mismatch)
/__w/<private project>/<private project>/target/llvm-cov-target/<private project>-17399-11873273069187591105_0.profraw: _RNvMs2_NtNtCsiwUvRo5Y02h_12regex_syntax3ast5printINtB5_6WriterQNtNtCsiTKmwCdMyvL_4core3fmt9FormatterE15fmt_class_asciiB9_: function basic block count change detected (counter mismatch)
/__w/<private project>/<private project>/target/llvm-cov-target/<private project>-17399-11873273069187591105_0.profraw: _RNvMs3_NtNtCsiwUvRo5Y02h_12regex_syntax3ast5parseINtB5_7ParserIQNtB5_6ParserE24parse_counted_repetitionB9_: function basic block count change detected (counter mismatch)
/__w/<private project>/<private project>/target/llvm-cov-target/<private project>-17399-17927172015354946806_0.profraw: _RNvXsk_Cs4MxhT0zqSGQ_10num_traitsfNtB5_3Num14from_str_radix: function basic block count change detected (counter mismatch)
/__w/<private project>/<private project>/target/llvm-cov-target/<private project>-17399-17927172015354946806_0.profraw: _RNvXsl_Cs4MxhT0zqSGQ_10num_traitsdNtB5_3Num14from_str_radix: function basic block count change detected (counter mismatch)
/__w/<private project>/<private project>/target/llvm-cov-target/<private project>-17399-17927172015354946806_0.profraw: _RNvMNtCsivMaHCyvWuZ_5bytes9bytes_mutNtB2_8BytesMut13reserve_inner: function basic block count change detected (counter mismatch)
/__w/<private project>/<private project>/target/llvm-cov-target/<private project>-17399-17927172015354946806_0.profraw: _RNvMs2_NtNtCsiwUvRo5Y02h_12regex_syntax3ast5printINtB5_6WriterQNtNtCsiTKmwCdMyvL_4core3fmt9FormatterE14fmt_repetitionB9_: function basic block count change detected (counter mismatch)
/__w/<private project>/<private project>/target/llvm-cov-target/<private project>-17399-17927172015354946806_0.profraw: _RNvMs2_NtNtCsiwUvRo5Y02h_12regex_syntax3ast5printINtB5_6WriterQNtNtCsiTKmwCdMyvL_4core3fmt9FormatterE14fmt_class_perlB9_: function basic block count change detected (counter mismatch)
/__w/<private project>/<private project>/target/llvm-cov-target/<private project>-17399-17927172015354946806_0.profraw: _RNvMs2_NtNtCsiwUvRo5Y02h_12regex_syntax3ast5printINtB5_6WriterQNtNtCsiTKmwCdMyvL_4core3fmt9FormatterE15fmt_class_asciiB9_: function basic block count change detected (counter mismatch)
/__w/<private project>/<private project>/target/llvm-cov-target/<private project>-17399-17927172015354946806_0.profraw: _RNvMs3_NtNtCsiwUvRo5Y02h_12regex_syntax3ast5parseINtB5_7ParserIQNtB5_6ParserE24parse_counted_repetitionB9_: function basic block count change detected (counter mismatch)
/__w/<private project>/<private project>/target/llvm-cov-target/<private project>-18134-11873273069187591105_0.profraw: _RNvMNtCsivMaHCyvWuZ_5bytes9bytes_mutNtB2_8BytesMut13reserve_inner: function basic block count change detected (counter mismatch)
/__w/<private project>/<private project>/target/llvm-cov-target/<private project>-18134-11873273069187591105_0.profraw: _RNvMs2_NtNtCsiwUvRo5Y02h_12regex_syntax3ast5printINtB5_6WriterQNtNtCsiTKmwCdMyvL_4core3fmt9FormatterE14fmt_repetitionB9_: function basic block count change detected (counter mismatch)
/__w/<private project>/<private project>/target/llvm-cov-target/<private project>-18134-11873273069187591105_0.profraw: _RNvMs2_NtNtCsiwUvRo5Y02h_12regex_syntax3ast5printINtB5_6WriterQNtNtCsiTKmwCdMyvL_4core3fmt9FormatterE14fmt_class_perlB9_: function basic block count change detected (counter mismatch)
/__w/<private project>/<private project>/target/llvm-cov-target/<private project>-18134-11873273069187591105_0.profraw: _RNvMs2_NtNtCsiwUvRo5Y02h_12regex_syntax3ast5printINtB5_6WriterQNtNtCsiTKmwCdMyvL_4core3fmt9FormatterE15fmt_class_asciiB9_: function basic block count change detected (counter mismatch)
/__w/<private project>/<private project>/target/llvm-cov-target/<private project>-18134-11873273069187591105_0.profraw: _RNvMs3_NtNtCsiwUvRo5Y02h_12regex_syntax3ast5parseINtB5_7ParserIQNtB5_6ParserE24parse_counted_repetitionB9_: function basic block count change detected (counter mismatch)
...
...
/__w/<private project>/<private project>/target/llvm-cov-target/<private project>-8794-8608724866949346408_0.profraw: _RNvMs3_NtNtNtCsf3hxVJuMWqO_14regex_automata3nfa8thompson6pikevmNtB5_6PikeVM10search_imp: function basic block count change detected (counter mismatch)
/__w/<private project>/<private project>/target/llvm-cov-target/<private project>-8794-8608724866949346408_0.profraw: _RNvMs3_NtNtNtCsf3hxVJuMWqO_14regex_automata3nfa8thompson6pikevmNtB5_6PikeVM21which_overlapping_imp: function basic block count change detected (counter mismatch)
/__w/<private project>/<private project>/target/llvm-cov-target/<private project>-8794-8608724866949346408_0.profraw: _RNvNtNtCsf3hxVJuMWqO_14regex_automata4util11determinize4next: function basic block count change detected (counter mismatch)
/__w/<private project>/<private project>/target/llvm-cov-target/<private project>-8794-8608724866949346408_0.profraw: _RNvMs_NtNtCsf3hxVJuMWqO_14regex_automata6hybrid3dfaNtB4_3DFA14try_search_fwdB8_: function basic block count change detected (counter mismatch)
/__w/<private project>/<private project>/target/llvm-cov-target/<private project>-8794-8608724866949346408_0.profraw: _RNvMs_NtNtCsf3hxVJuMWqO_14regex_automata6hybrid3dfaNtB4_3DFA14try_search_revB8_: function basic block count change detected (counter mismatch)
/__w/<private project>/<private project>/target/llvm-cov-target/<private project>-8794-8608724866949346408_0.profraw: _RNvMs_NtNtCsf3hxVJuMWqO_14regex_automata6hybrid3dfaNtB4_3DFA26try_search_overlapping_fwdB8_: function basic block count change detected (counter mismatch)
/__w/<private project>/<private project>/target/llvm-cov-target/<private project>-8794-8608724866949346408_0.profraw: _RNvMs_NtNtNtCse15TmI79P4z_12aho_corasick6packed5teddy7builderNtB4_7Builder9build_imp: function basic block count change detected (counter mismatch)
/__w/<private project>/<private project>/target/llvm-cov-target/<private project>-8794-8608724866949346408_0.profraw: _RNvMs1_NtNtCse15TmI79P4z_12aho_corasick4util9prefilterNtB5_7Builder5build: function basic block count change detected (counter mismatch)

    Finished report saved to coverage.xml

They dont seem to effect the coverage stats, which on the face look to be accurate.

There are lots of google hits for "function basic block count change detected (counter mismatch)" - it appears to be emitted by llvm-cov instead of cargo-llvm-cov, so probably isnt a problem with cargo-llvm-cov directly, but maybe there is a way to avoid these.

This is a commercial private repo, so I cant easily provide a reproducible, but I will try to assist as best I can.