Bug#870049: diffoscope: hangs on some LLVM bytecode files and maybe other files

[Ximin Luo]

Ximin Luo:
> Package: diffoscope
> Version: 84
> Severity: important
> 
> Dear Maintainer,
> 
> When testing rustc reproducibility:
> 
> $ for i in {1..10}; do diffoscope core-fcc113aeec9d4b78.0.bytecode.0 core-fcc113aeec9d4b78.0.bytecode.1 | wc -l; done
> # hangs first time
> 
> $ for i in {1..10}; do diffoscope --max-diff-input-lines 0 core-fcc113aeec9d4b78.0.bytecode.0 core-fcc113aeec9d4b78.0.bytecode.1 | wc -l; done
> # hangs after a few (3-30) tries, seems random
> 
> $ for i in {1..10}; do diff -ru <(llvm-bcanalyzer -dump core-fcc113aeec9d4b78.0.bytecode.0) <(llvm-bcanalyzer -dump core-fcc113aeec9d4b78.0.bytecode.1) | wc -l; done
> # succeeds every time
> 
> When running `pstree -alup` one can see either one or both llvm-bcanalyzer processes running. I guess there's a race condition to do with filtering command output.
> 

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