Just a quick note to say that I have experienced a lot of kernel
panics on all nodes of a cluster installed with Ubuntu 11.10 + kernel
3.0.x running under Amazon EC2 (large instance).
Kernels 3.0.0-12, 3.0.0-13 and 3.0.0-14 all panic'ed under high
ElasticSearch load. I am using ES 0.18.5 with OpenJDK java version
"1.6.0_23" Runtime Environment (IcedTea6 1.11pre)
I "downgraded" to kernel 2.6.38-8 and so far so good.