To follow up a little. A great free memory tester is here:

http://www.memtest86.com/

Oscar

On Tue, 18 Nov 2003, Oscar Carrillo wrote:

> What's your hardware? Are you running multiple processors?
> 
> Do you compile your own Apache2 and mod_jk/mod_jk2?
> 
> Have you tried compiling your own kernel from the more recent sources.  
> Kernel 2.4 had some shaky releases and RedHat8 fell in the middle of it.  
> Kernel 2.4.22 is the latest.
> 
> Have you tried setting the environment variable: LD_KERNEL_ASSUME=2.2.5?
> 
> Oscar
> 
> On Tue, 18 Nov 2003, David Muller wrote:
> 
> > Hello all, Can anyone please confirm or deny rumors that moving from RH8
> > to RH9 fixes random Sig 11 crashes when an Apache2/Tomcat4/JVM1.4X app
> > is loaded?
> > 
> > We have gone through a huge matrix of heap sizes, stack sizes,
> > connectors, connector settings, hyperthreading off, etc. with jvm
> > gcverbose on and still get sig 11's at random places when we load our
> > app.  This is with BOTH the IBM 1.4.1 JDK and the Sun 1.4.2_02 JDK.
> > 
> > We have upgraded RH 8 with the latest OS patches.
> > 
> > If anyone has found this and can point to a specific lib that would be
> > even better.
> > 
> > Thanks,
> > -Dave
> > 
> > -----Original Message-----
> > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
> > Sent: Monday, November 17, 2003 2:54 AM
> > To: [EMAIL PROTECTED]
> > Subject: RE: Signal 11 causing Tomcat crash
> > 
> > 
> > I've seen similar things with Java.
> > 
> > Are all the java related patches for the OS applied.  We recently have a
> > similar issue with Solaris 2.8 and Java and applying the relevant patches
> > cured it.
> > 
> > File a bug report with Sun/IBM?
> > 
> > Greg
> > 
> > > -----Original Message-----
> > > From: Phil Steitz [mailto:[EMAIL PROTECTED]
> > > Sent: 15 November 2003 21:38
> > > To: Tomcat Users List
> > > Subject: Re: Signal 11 causing Tomcat crash
> > > 
> > > 
> > > Jim Goodspeed wrote:
> > > > Unfortunately we have also tried Sun's JVM and are
> > > > experiencing the same Signal 11 errors (I've included
> > > > two snippets of the Sun error - same error as the IBM
> > > > Sig 11, just in a different format).  Sometimes the
> > > > dump specifies the library in question, other times it
> > > > does not.
> > > > 
> > > > Thanks,
> > > > Jim
> > > > 
> > > > An unexpected exception has been detected in native
> > > > code outside the VM.
> > > > Unexpected Signal : 11 occurred at PC=0x1
> > > > Function=[Unknown.]
> > > > Library=(N/A)
> > > > 
> > > > An unexpected exception has been detected in native
> > > > code outside the VM.
> > > > Unexpected Signal : 11 occurred at PC=0x59DF83B0
> > > > Function=(null)+0x59DF83B0
> > > > Library=/usr/IBMdb2/V7.1/lib/libdb2.so.1
> > > 
> > > Are you sure that the driver version and fixpack match the 
> > > server?  DB2 
> > > can do funny things when this is not the case.  See for example: 
> > > http://dbforums.com/arch/39/2002/9/515834
> > > 
> > > Phil
> > > 
> > > 
> > > 
> > > 
> > > 
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> 
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