From: Alison Schofield <amsfield22@gmail.com>
To: miguel.robles@farole.net
Cc: Daniel Baluta <daniel.baluta@gmail.com>,
linux-iio@vger.kernel.org, linux-iio-owner@vger.kernel.org
Subject: Re: PROBLEM: iio: dummy: Oops after mkdir
Date: Thu, 9 Mar 2017 09:36:54 -0800 [thread overview]
Message-ID: <20170309173653.GA3675@d830.WORKGROUP> (raw)
In-Reply-To: <592203dd4ed4ded678778294008728bc@farole.net>
On Thu, Mar 09, 2017 at 04:59:39PM +0100, miguel.robles@farole.net wrote:
> On 2017-03-09 16:41, Daniel Baluta wrote:
> >On Thu, Mar 9, 2017 at 4:34 PM, Miguel Robles <miguel.robles@farole.net>
> >wrote:
> >>Hello all,
> >>
> >>I am beginning with Linux Kernel development. So I am trying to make
> >>the IIO tasks posted on kernelnewbies DOT org.
> >>But I got stuck with this problem that I am describing you hereafter
> >>hoping that someone could bring me any feedback.
> >>
> >>Many thanks,
> >>Miguel ROBLES
> >>
> >>----------
> >>DESCRIPTION
> >>-----------
> >>
> >>After loading the corresponding IIO modules and mountig the configfs
> >>filesystem
> >>I can not create an instance device with mkdir using the command:
> >>
> >>$ sudo mkdir /config/iio/devices/dummy/my_dummy_device
> >>Killed
> >>
> >>I get the "Killed" message and looking at my syslog file, I got the
> >>warning
> >>"refcount_t: increment on 0; use-after-free" followed by an "Oops"
> >>message.
> >>When trying to execute the command one more time, the execution never
> >>finishes.
> >>
> >>
> >>------
> >>CONTEXT
> >>-------
> >>
> >>- Tried on 2 linux kernel releases:
> >> - kernel: 4.10 (commit: 4977ab6)
> >> - Kernel: 4.11 (commit: ec3b93a)
> >>
> >>- Compiled with config file including the following options for IIO:
> >>
> >>#
> >># IIO dummy driver
> >>#
> >>CONFIG_IIO_DUMMY_EVGEN=m
> >>CONFIG_IIO_SIMPLE_DUMMY=m
> >>CONFIG_IIO_SIMPLE_DUMMY_EVENTS=y
> >>CONFIG_IIO_SIMPLE_DUMMY_BUFFER=y
> >>
> >>CONFIG_IIO_CONFIGFS=m
> >
> >Do you also have CONFIG_IIO_SW_DEVICE right?
>
> Yes, and the value is: CONFIG_IIO_SW_DEVICE=m.
>
> Thank you,
> Miguel
> >
> >Will try to have a look at this asap.
> >
> >
> >thanks,
> >Daniel.
Daniel,
You probably saw, but just in case...
I verified that the process, including the above mkdir, is working on
4.10-rc3. (So, I'm relieved the Outreachy applicants won't start
hitting it.)
alisons
> --
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next prev parent reply other threads:[~2017-03-09 17:37 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-03-09 14:34 PROBLEM: iio: dummy: Oops after mkdir Miguel Robles
2017-03-09 15:41 ` Daniel Baluta
2017-03-09 15:59 ` miguel.robles
2017-03-09 17:36 ` Alison Schofield [this message]
2017-03-09 17:40 ` Alison Schofield
2017-03-09 18:08 ` Miguel Robles
2017-03-09 18:15 ` Lars-Peter Clausen
2017-03-09 18:25 ` Miguel Robles
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