Re: Signal 11 - the continuing saga

Jeff V. Merkey
2000-12-13T01:52:30Z

On Wed, Dec 13, 2000 at 09:22:55AM +0900, Rainer Mager wrote:
> Hi again,
>
> Ok, I just upgraded to 2.4.0test12 (although I don't think there was any
> work in 12 that directly addresses this signal 11 problem). When compiling
> the new kernel I chose to disable AGPGart and RDM as suggested by
> davej@suse.de. I will report later if this makes any difference.
>
> On another, possibly related note, I'm getting some really weird behavior
> with a Java program. The only reason I mention it here is because it dies
> with our old friend Signal 11. Anyway, please bear with the description
> below.
> I have a tiny bash script that launches a Java swing app. If I run my
> script from an xterm (or gnome-terminal or whatever) then it starts up fine.
> If, however, I try to launch it from my gnome taskbar's menu then it dies
> with signal 11 (the Java log is available upon request). This seems to be
> 100% consistent, since I noticed it yesterday, even across reboots.
> Interestingly, the same behavior occurs if I try to run the program from
> withis JBuilder 4.
> So, is this related to the larger signal 11 problems?

There's a corruption bug in the page cache somewhere, and it's 100%
reproducable. Finding it will be tough....

>
>
> What else can I do regarding these issues to help fix it? Would a core dump
> help anyone? I'd really like to contribute somehow but I need some
> direction.
>
>
> --Rainer
>
> > From: CMA [mailto:cma@mclink.it]
> > Did you already try to selectively disable L1 and L2 caches (if
> > your box has both) and see what happens?
>
> Anyone know how to do this?

Usually this is performed in the BIOS setup. You can also disable L1
with a sequence of instructions that write to the CR0 register on intel
and flip a bit, but in doing this you have to execute a WBINV (write
back invalidate) instruction to flush out the cache. BIOS setup is
probably simpler. Disabling Level I will make the machine slower
than mollasses, BTW, and if this bug is race related (they always
are) it won't help much in running it down.

Jeff

>
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