SIGSEGV during Minor GC

Y. Srinivas Ramakrishna y.s.ramakrishna at oracle.com
Mon Aug 30 08:54:04 PDT 2010


Hi Shane --

Shane Cox wrote:
> We recently had a JVM crash during Minor GC.  The hotspot error file and gc
> log can be found in attached zip file.  GC settings are:
> -Xms350m -Xmx1024m -XX:+UseConcMarkSweepGC
> -XX:CMSInitiatingOccupancyFraction=55 -XX:+DisableExplicitGC -XX:+PrintGC
> -XX:+PrintGCDetails -XX:+PrintGCDateStamps -XX:RefDiscoveryPolicy=1
> 
> We're running build:
> java version "1.6.0_14"
> Java(TM) SE Runtime Environment (build 1.6.0_14-b08)
> Java HotSpot(TM) 64-Bit Server VM (build 14.0-b16, mixed mode)
> 
> 
> Any ideas what caused the crash?  Some speculate bug 6896647, but it doesn't
> seem conclusive.  Any insights would be appreciated.

I don't think this is 6896647 (or at least it doesn't the classic symptoms of
that bug).

I'd recommend reporting this in through the official support channels so
that they can help diagnose and resolve the issue for you. Of course 6u14 is
rather old by now, so you might consider a newer version as well.

I could not immediately see it being related to any specific recent bug that we
fixed in CMS, but there are a few fixes that have gone in recently for bugs which could,
under appropriate circumstances, corrupt the free list (which this crash resembles).

-- ramki
> 
> Thanks,
> Shane



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