Hi, we had some server crashes. I was able to take some histo's (couldn't get a heap dump though). Like last time we saw that DirectR references were taking up the most space in the heap (refs to the mmapped segments). We found that setting

-XX:SoftRefLRUPolicyMSPerMB=0

and combined with java11 (pr coming in the next 2 days) we are seeing that gc clears more soft references than before. Found this on the jvm mailing list: https://mail.openjdk.java.net/pipermail/hotspot-gc-dev/2019-April/025586.html