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From joe gspeed <>
Subject RE: Signal 11 Error: An unexpected exception in native code outside the VM
Date Tue, 30 Sep 2003 15:06:58 GMT
Right now the server has all of the latest and
greatest patches from Red Hat.  We are still seeing
crashes about once a day.

I am also observing a significant memory leak on this
box, though I can't figure out if its Tomcat, java,
the code or something else - once the memory gets low
enough tomcat crashes.

I am planning on making the following config changes
to hopefully remedy this problem:

-Xms512m -Xmx512m -XX:NewSize=256m -XX:MaxNewSize=512m

This machine has about 2gb of memory and the app
running on it is fairly database intensive.  Can
someone tell me if these settings make sense?

Thanks again.

--- "Shapira, Yoav" <> wrote:
> Howdy,
> >Signal 11 is a segmentation error (I think), which
> would be caused by
> >attempting to access an invalid memory address. 
> This in turn might be
> >caused by attempting (in native code) to construct
> an instance of a
> Java
> >class that the class loader can't find, something
> like:
> This is unnecessarily restrictive, although a
> possible explanation, as
> signal 11 is not just segmentation fault.  HotSpot
> categorizes many
> external/native exceptions as signal 11's.  The most
> frequent cause for
> these errors is a missing or old OS patch, e.g. the
> threading library.
> You must ensure your OS is properly updated.  For
> example, the Solaris
> patches for JDK 1.4.2 are here:
> The RedHat patches should be somewhere on the RedHat
> site.
> A second cause for this, though increasingly rare
> nowadays, is an
> improperly compiled JVM.  Then again, if you know
> enough to build your
> own JVM in the first place I don't think you're even
> reading this
> message ;)
> Yoav Shapira
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