Re: [1/5 PATCH] Kprobes fix for broken fault handling for i386

[Hien Nguyen <hien at us dot ibm dot com>]

Keshavamurthy Anil S wrote:

> On Tue, Mar 07, 2006 at 05:38:32AM -0800, Prasanna S Panchamukhi wrote:
>  
>
> >   Hi,
> >
> >   Below is the set of patches to fix broken fault handling
> >   for i386, x86_64, ppc64, ia64 and sparc64 architectures
> >   against 2.6.16-rc5-mm2.
> >
> >   These patches are tested for i386 and x86_64 architectures.
> >   Could you please test it for ia64 and ppc64.
> >    
>
> Prasanna,
> 	Can you share your test module code here,
> so that the same can be used(with minor tweak, if requred)
> for testing other architecture. Also in you testing, did 
> you cover fault handling during pre/post/singlestep
> cases?
>
> Thanks,
> Anil
>
>  
I tested Prasanna's fault handling patch with the current syscalls 
tapset (latest from CVS) which does lots of user copies. Without the 
patch the system crashes right away, but with this patch I finally can 
test the system calls tapset.

I use Martin's sys.stp script below

probe syscall.*, syscall.*.return {
       if (pid() == target()) {
               if (returnp)
                       printf("%d\n", returnval())
               else
                       printf("%s (%s) = ", name, argstr)
       }
}

Invoke the script as follow
stap -c bash sys.stp
to exit the script, just type exit.

Hien.