Parallel heap verification in G1 currently has a flaw which is that, if different GC workers find and attempt to report issues around the same time the output can get messed up. This is not a correctness flaw, i.e. the issues will be correctly identified and reported. However, it does sometimes make it very hard to make sense of the output. It'd be helpful to ensure that the output generated by parallel heap verification is always easily readable.
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