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Atanu,

On 10/26/17 5:23 AM, Mark Thomas wrote:
> On 25/10/2017 13:08, Atanu Pal wrote:
>> Still can you help me explain little more about the root cause?
>> 
>> That will help me to explain it to customer and setup a test 
>> environment for future. Thanks and Regards Atanu Pal 
>> E2Infosystems - Chennai
> 
> Difficult to say but a possible sequence of events is something
> like:
> 
> - thread A adds socket S to poller - thread B closes socket S -
> poller tries of access socket S -> crash

If you switch from the APR connector to NIO does the problem still occur
?

Are you sure you need the APR connector at all? Usually, it's only
used to get access to the OpenSSL crypto engine. Perhaps you can do
TLS offloading onto another device such as a load-balancer?

If the problem goes away when switching connectors, can you try to use
Tomcat 8.5.x with the OpenSSL JSSE provider? That's an NIO connector
with OpenSSL providing the crypto under the hood (so it's actually
fast, unlike the JVM-provided crypto engine).

- -chris
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