Re: kprobes + nptl01 (test in ltp testsuite) problem

["manjunath k" <kmanjunat at gmail dot com>]

 Ive executed the same tests for the 2.6.16.y kernel before, but the tests used
to pass.
 Ive used the put_user() in this testcase does it mean that the put_user()
is a blocking call or goes into sleep in 2.6.22.1 kernel version.

Manjunath

On 7/24/07, Ananth N Mavinakayanahalli <ananth@in.ibm.com> wrote:
> On Tue, Jul 24, 2007 at 05:25:57PM +0530, manjunath k wrote:
> > Hi,
> >
> >  Ive been using the kprobes on X86 m/c and found the following problem with
> > the following kprobe and the testsuite.
> >
> > 1. A probe is placed for the sys_gettimeofday with the pre/post/fault
> > handlers
> >   defined (k-test.c is attached).
> >
> > 2. The nptl01 test from the ltp testuite is executed and the system gets
> > into an
> > infinite loop (nptl01.c is attached).
> >
> > Ive attached the log file that contains the output that was seen when
> > the above test is performed (kprobe-nptl.log), the log file is
> > stripped for the purpose of attaching.
> >
> > Please provide me some information regarding the above failure.
>
> You can't call functions that can either fault or sleep/block in your
> kprobe handlers. get_user() can sleep.
>
> Ananth