Every once in a while we get the following (Tomcat 6)
Mar 31, 2015 7:24:32 PM org.apache.tomcat.util.threads.ThreadPool logFull
SEVERE: All threads (200) are currently busy, waiting. Increase
maxThreads (200) or check the servlet status
in the Catalina logs and server stops responding. The server is used
very lightly and number of concurrent users not anywhere near 200 (2-3
on a busy day)
The thread dump shows 199 of these:
"TP-Processor200" daemon prio=10 tid=0x00002b513c31b000 nid=0x1c44
runnable [0x00002b514a9a7000]
java.lang.Thread.State: RUNNABLE
at java.net.SocketInputStream.socketRead0(Native Method)
at java.net.SocketInputStream.read(SocketInputStream.java:129)
at java.io.BufferedInputStream.fill(BufferedInputStream.java:218)
at java.io.BufferedInputStream.read1(BufferedInputStream.java:258)
at java.io.BufferedInputStream.read(BufferedInputStream.java:317)
- locked <0x00000007873208a0> (a java.io.BufferedInputStream)
at org.apache.jk.common.ChannelSocket.read(ChannelSocket.java:628)
at org.apache.jk.common.ChannelSocket.receive(ChannelSocket.java:566)
at
org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:693)
at
org.apache.jk.common.ChannelSocket$SocketConnection.runIt(ChannelSocket.java:898)
at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:690)
at java.lang.Thread.run(Thread.java:662)
and one of
"TP-Processor4" daemon prio=10 tid=0x00002b513c21a000 nid=0x7470 in
Object.wait() [0x00002b5135520000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x0000000784a7a208> (a
org.apache.tomcat.util.threads.ThreadPool)
at java.lang.Object.wait(Object.java:485)
at
org.apache.tomcat.util.threads.ThreadPool.findControlRunnable(ThreadPool.java:339)
- locked <0x0000000784a7a208> (a
org.apache.tomcat.util.threads.ThreadPool)
at org.apache.tomcat.util.threads.ThreadPool.runIt(ThreadPool.java:314)
at
org.apache.jk.common.ChannelSocket.acceptConnections(ChannelSocket.java:676)
at
org.apache.jk.common.ChannelSocket$SocketAcceptor.runIt(ChannelSocket.java:879)
at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:690)
at java.lang.Thread.run(Thread.java:662)
Can anybody figure out why it complaints about busy threads when they
are clearly not?
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