3 bugs found.

[David Smith]

James Dickens wrote:
> Here are 3 scripts, one line each, they each break the Systemtap one
> is old, just needs to expand the current bug report.
> 
> Linux localhost.localdomain 2.6.17-1.2187_FC5 #1 Mon Sep 11 01:17:06
> EDT 2006 i686 athlon i386 GNU/Linux

Since I've got a similar system (except mine isn't an athlon), I decided 
to take a look at these.  See stuff below.

> Latest cvs updates as of 2  hours ago.
> 
> Distro: Fedora FC5
> 
> Stack fault on the cpu. Halting the machine, This is x86 previously
> only filed for x86_64
> 
> probe kernel.function("*") { print(".") }
> 
> To narrow it down a bit, this causes the same stack fault
> 
> probe kernel.function("*@kernel/*") { printf("here\n"); }

I've narrowed this one down.  This only happens when probing 
'atomic_notifier_call_chain'.

> This one produces an oops, I can post the end of it, if nobudy else
> can reproduce that has a serial console.
> 
> probe kernel.function("*@kernel/spinlock.c") { printf("."); }

I've reproduced this one with '_spin_unlock_irqrestore'.  On the console 
I get:

BUG: spinlock lockup on CPU#0

With those two functions added to the blacklist (I'm not sure that is 
the right fix, I just want to get past those two functions), the 
following works correctly:

probe kernel.function("*@kernel/*") { printf("here\n"); }

Now your first probe (probing the entire kernel) still fails.  I'm 
trying to narrow it down.

-- 
David Smith
dsmith@redhat.com
Red Hat, Inc.
http://www.redhat.com
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