[DIRMINA-1084] 100% CPU when using IoBuffer.shrink() method in some cases

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Duplicate
• Affects Version/s: 2.0.7
• Component/s: SSL
• Environment: Any
• Flags: Important
• Assignee: Unassigned
• Reporter: Dhinakaran Arumugam
• Created: 05/Apr/18 06:52
• Updated: 06/Apr/18 04:54
• Resolved: 05/Apr/18 07:45

Description

"socket_c2s_ssl-thread-6" daemon prio=10 tid=0x82f5a000 nid=0x1355 runnable [0x7d618000]
   java.lang.Thread.State: RUNNABLE
    at org.apache.mina.core.buffer.AbstractIoBuffer.shrink(AbstractIoBuffer.java:317)
    at org.apache.mina.filter.ssl.SslHandler.fetchOutNetBuffer(SslHandler.java:406)
    at org.apache.mina.filter.ssl.SslHandler.writeNetBuffer(SslHandler.java:642)
    at org.apache.mina.filter.ssl.SslFilter.initiateClosure(SslFilter.java:665)
    at org.apache.mina.filter.ssl.SslFilter.filterClose(SslFilter.java:627)
    - locked <0x9f31fb80> (a org.apache.mina.filter.ssl.SslHandler)

When one tries to shrink a buffer which minimal capacity is set to 0, and set the size to 0, it enter into an infinite loop.

Bug https://issues.apache.org/jira/browse/DIRMINA-988 has created in 2.0.8 it was a similar bug, but the code is slightly different in 2.0.7. But the problem is same. We should acknowledge this issue is present in 2.0.7.

This is due to this loop :

while (newCapacity >>> 1 >= minCapacity) {
  newCapacity >>>= 1;
}

 

Issue Links

• is a clone of: DIRMINA-988 100% CPU when using IoBuffer.shrink() method in some cases