Enviroment:
jdk 1.6.0_29 64bit 
solaris 10
TC 7.0.22 
every visual machine installed two tc 7.0.22,one 8080 , the other 8081.

randomly tomcat can't response any request.but no oom,when use IE.the PID is still there.

attachment show something be locked,but why?

Maybe someone can help me .