From mboxrd@z Thu Jan  1 00:00:00 1970
From: <j.villena@ecler.com>
References: <003a01d7a10d$9268d6b0$b73a8410$@ecler.com>
 <87sfyk7pwl.fsf@xenomai.org> <001701d7a241$8f019ae0$ad04d0a0$@ecler.com>
 <87mtor6mi7.fsf@xenomai.org> <000001d7a816$334d9bb0$99e8d310$@ecler.com>
 <000e01d7a875$15c08ee0$4141aca0$@ecler.com> <87ee9j20pc.fsf@xenomai.org>
In-Reply-To: <87ee9j20pc.fsf@xenomai.org>
Subject: RE: Using oob GPIO on RPi4B and evl_poll
Date: Mon, 20 Sep 2021 10:12:06 +0200
Message-ID: <001301d7adf7$34175270$9c45f750$@ecler.com>
MIME-Version: 1.0
Content-Type: text/plain;
	charset="us-ascii"
Content-Transfer-Encoding: 7bit
Content-Language: es
List-Id: Discussions about the Xenomai project <xenomai.xenomai.org>
List-Unsubscribe: <https://xenomai.org/mailman/options/xenomai>,
 <mailto:xenomai-request@xenomai.org?subject=unsubscribe>
List-Archive: <http://xenomai.org/pipermail/xenomai/>
List-Post: <mailto:xenomai@xenomai.org>
List-Help: <mailto:xenomai-request@xenomai.org?subject=help>
List-Subscribe: <https://xenomai.org/mailman/listinfo/xenomai>,
 <mailto:xenomai-request@xenomai.org?subject=subscribe>
To: xenomai@xenomai.org

Hi Philippe,

Now it works as expected. Thank you!

Jesus



> 
> j.villena--- via Xenomai <xenomai@xenomai.org> writes:
> 
> > Sorry Philippe, I have found another evl_poll related issue, similar
> > to the previous one. This time, a system crash happens when waiting in
> > evl_poll for more than 3 file descriptors.
> >
> > This is a simple program to force the wrong behavior:
> > https://www.dropbox.com/s/bq7lng7dgvknypv/evl_poll_test2.c?dl=0
> >
> > It's very similar to the other sent previously, but not using any GPIO
> > related functionality. The only objects which file descriptors are
> > used in evl_poll are evl_flags. The program works as expected using a
> > value of kFlagsCount < 4. From 4 upwards the kernel freezes.
> >
> > The kernel console output using kFlagsCount > 3 is:
> >
> 
> <snip>
> 
> Once again your test program made a difference by illustrating the issue
> clearly, thanks for this. The bug was related to the previous one, same
root
> cause which I eventually fixed for good with [1].
> 
> libevl r27 is out [2] with one test case more covering this (poll-many).
> 
> [1] https://source.denx.de/Xenomai/xenomai4/linux-evl/-
> /commit/ccfed6556c7adf47a8e61febb681735f3b2710bc
> [2] https://source.denx.de/Xenomai/xenomai4/libevl/-/tree/r27
> 
> --
> Philippe.