Thanks Jeff, At time of crash it said: .../linux-4.4.0/mm/pgtable-generic.c:33: 
bad pmd.... So i just run this on all of my nodes: echo never | sudo tee 
/sys/kernel/mm/transparent_hugepage/defrag Sent using Zoho Mail ============ 
Forwarded message ============ From : Jeff Jirsa <jji...@gmail.com> To : 
<user@cassandra.apache.org> Date : Sun, 22 Jul 2018 10:43:38 +0430 Subject : 
Re: Cassandra crashed with no log ============ Forwarded message ============ 
Anything in non-Cassandra logs? Dmesg? --  Jeff Jirsa On Jul 21, 2018, at 11:07 
PM, onmstester onmstester <onmstes...@zoho.com> wrote: Cassandra in one of my 
nodes, crashed without any error/warning in system/gc/debug log. All jmx 
metrics is being monitored, last fetched values for heap usage is 50% and for 
cpu usage is 20%. How can i find the cause of crash? Sent using Zoho Mail

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