Igor reported that he was seeing this assertion while testing tiered through JPRT - though this particular assert was seen when running on C1. Here's Igor's email: This one appeared again in during my testing today: # Internal Error (/tmp/jprt/P1/B/150025.iv159533/source/src/share/vm/gc_implementation/g1/concurrentG1Refine.cpp:307), pid=19418, tid=3031919504 # assert(cached_ptr != card_ptr) failed: shouldn't be It's linux x86 c1. It was preceded by the cleanup. igor
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