JVM death in lkMonitorEnter   

Hi there,

I´ve a 1.4.2 SR11 that is dying due to a SIGSEGV received in lkMonitorEnter.

Here it´s the native stack of the offending thread:

lkMonitorEnter at B732057A in libjvm.so
L1_monitorenter__ at B7386198 in libjvm.so
L0_invokevirtual_quick_w__ at B737CC92 in libjvm.so
L0_invokevirtualobject_quick__ at B737C82A in libjvm.so
mmipExecuteJava at B7376863 in libjvm.so
A22B8930

In the JAVA stack trace I can see that a FFDC file was generated and looking at that file I can see that a ClassCastException have been thrown. Not sure whether this can be related to the major issue (lkMonitorEnter).

Have anyone seen this before?

BTW, JVM is using optavgpause as its GC policy.

Thanks in advance,
Davi

Hi Chris,

From the application standpoint, there is no JNI code. But I´m not sure whether WebSphere may be doing use of native functions (I guess the answer is NO since the application do not leverage from anything else despite servlet 2.3 and JSP 1.2).

We´re about to apply SR13. Not sure if the one available at http://www-01.ibm.com/support/docview.wss?uid=swg24022776 is the SP2 that you´ve mentioned. However we don´t have steps to reproduce the problem... so we probably will never know for sure whether this release has fixed the error or the error happened only once.

Thanks for your attention.

--Davi