Any application which uses v4l2src element can be froze when recording video (e.x. cheese)

Status changed to 'Confirmed' because the bug affects multiple users.

Redhat has a similar bug that video device is busy when doing video recording.

- https://bugzilla.gnome.org/show_bug.cgi?id=670257

Gstreamer bugs:
- https://bugzilla.gnome.org/show_bug.cgi?id=670257

Explain for the patch:

When recording video, Cheese uses gsteamer to set caps, meanwhile cmaera device re-init while caps settings.
because the buffer is not freed and kernel complain that camera device is busy, so cheese hangs.

@Christopher

I have some questions for you , pleas help , thanks.
And also please provide logs for each question ( the instructions are inline)

Q1. Does cheese video recording works if you use 3.2 kernel ?

1. Install 3.2 kernel
2. Boot with 3.2 kernel
3. Launch Cheese with the following command "cheese --gst-debug=5 --gst-debug-no-color 2> 3.2cheese_debug.log"
4. Start to Recording

Please help to attache 3.2cheese_debug.log. I found some machines's cheese video recording works with 3.2 kernel and 3.5 kernel, but others does not work with 3.5 kernel , but works with 3.2 kernel.

Q2: What are video resolution Cheese shows in preference ? Which is default.

Q3: Does guvcview works well even you uses 3.5 kernel?

Q4: What is your webcam?

please attache the output of " lsusb -v "

gucview suits my hardware better than cheese. If I have time, I'll get
to the cheese issue. I always have the latest kernel and proposed updates.

On 13-01-25 06:43 AM, Hsin-Yi, Chen (hychen) wrote:
> @Christopher
>
> I have some questions for you , pleas help , thanks.
> And also please provide logs for each question ( the instructions are inline)
>
> Q1. Does cheese video recording works if you use 3.2 kernel ?
>
> 1. Install 3.2 kernel
> 2. Boot with 3.2 kernel
> 3. Launch Cheese with the following command "cheese --gst-debug=5 --gst-debug-no-color 2> 3.2cheese_debug.log"
> 4. Start to Recording
>
> Please help to attache 3.2cheese_debug.log. I found some machines's
> cheese video recording works with 3.2 kernel and 3.5 kernel, but others
> does not work with 3.5 kernel , but works with 3.2 kernel.
>
> Q2: What are video resolution Cheese shows in preference ? Which is
> default.
>
> Q3: Does guvcview works well even you uses 3.5 kernel?
>
> Q4: What is your webcam?
>
> please attache the output of " lsusb -v "
>

Added precise task because this may affect the lts backport stack on precise

this bug can be fixed by this patch

From 4cd9255f0a8a9e15d81561f00f02d275b5095f70 Mon Sep 17 00:00:00 2001
From: Oleksij Rempel (Alexey Fisher) <email address hidden>
Date: Thu, 01 Mar 2012 13:15:29 +0000
Subject: v4l2src: fix v4l2_munmap() for compressed formats

Make sure we always call munmap() with the same size we called mmap()
with before.

Current v4l2src uses the same structure for VIDIOC_QUERYBUF, VIDIOC_QBUF
and v4l2_munmap calls. The problem is that the video buffer size (length)
may vary for compressed or emulated bufs. VIDIOC_QBUF will change it if
we pass the pointer of a v4l2_buffer. This is why we should avoid using
same variable for mmap and video buffers.

https://bugzilla.gnome.org/show_bug.cgi?id=671126

The attachment "0001-fix-v4l2_munmap.patch" of this bug report has been identified as being a patch. The ubuntu-reviewers team has been subscribed to the bug report so that they can review the patch. In the event that this is in fact not a patch you can resolve this situation by removing the tag 'patch' from the bug report and editing the attachment so that it is not flagged as a patch. Additionally, if you are member of the ubuntu-reviewers team please also unsubscribe the team from this bug report.

[This is an automated message performed by a Launchpad user owned by Brian Murray. Please contact him regarding any issues with the action taken in this bug report.]

@hychen: thanks for the work there. Is that patch required in raring or is the issue fixed with gstreamer 1.0?

Steve: The comments suggest the issue doesn't happen in precise ... what do you mean by "backport stack on precise"? Do you guys need the fix in quantal, or are you just concerned that the bug might hit precise through an update at some point?

1. This bug can reproduced on precise.
2. the patch is for gstreamer-0.10 branch , not 1.0 branch.

@Seb: The 'LTS backport stack' is the quantal kernel + xorg that was backported to precise for hardware enablement. The packages in the lts backport stack include linux-lts-quantal and xserver-org-lts-quantal. The bug can occur when that backport stack is used with a precise userspace.

@Steve: thanks for the explanation, does that mean it's happening with 12.04.2 new installs or is the hadware enablement stack an opt-in still (I think upgrades don't get the new stack but new install will get it but I'm not sure)? In any case it's on my todolist and I will get it upload in the next days

Hey,

I'm uploading to raring now. Thanks!

Can someone (~hychen?) rewrite the description here to be SRU compliant? Description, test case, regression potential.

Then I or Seb or someone can upload.

  https://wiki.ubuntu.com/StableReleaseUpdates#Procedure

Cheers.

This bug was fixed in the package gst-plugins-good0.10 - 0.10.31-3+nmu1ubuntu2

---------------
gst-plugins-good0.10 (0.10.31-3+nmu1ubuntu2) raring; urgency=low

  * debian/patches/0001-fix-v4l2_munmap.patch: Cherry-pick a commit from
    upstream to resolve an issue where applications freeze when using v4l2src.
    (LP: #1041432)
 -- Iain Lane <email address hidden> Mon, 11 Feb 2013 11:18:03 +0000

Hi Iain,

I've uploaded the SRU report, let me know if there's anything else you would like.

There's an outstanding SRU for this package—bug #1068155—which it would be preferable to clear out before uploading another one. I don't suppose you'll be able to help verifying it due to the nature of the bug. I'll give the reporter a few days to reply before taking any further action.

Oho, the submitter there responded faster than I expected. Uploaded to quantal and precise -proposed

That's good, thanks for the update Iain

Hello Christopher, or anyone else affected,

Accepted gst-plugins-good0.10 into precise-proposed. The package will build now and be available at http://launchpad.net/ubuntu/+source/gst-plugins-good0.10/0.10.31-1ubuntu1.2 in a few hours, and then in the -proposed repository.

Please help us by testing this new package. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Your feedback will aid us getting this update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug, mentioning the version of the package you tested, and change the tag from verification-needed to verification-done. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-failed. In either case, details of your testing will help us make a better decision.

Further information regarding the verification process can be found at https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance!

Hello Christopher, or anyone else affected,

Accepted gst-plugins-good0.10 into quantal-proposed. The package will build now and be available at http://launchpad.net/ubuntu/+source/gst-plugins-good0.10/0.10.31-3ubuntu1.2 in a few hours, and then in the -proposed repository.

Please help us by testing this new package. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Your feedback will aid us getting this update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug, mentioning the version of the package you tested, and change the tag from verification-needed to verification-done. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-failed. In either case, details of your testing will help us make a better decision.

Further information regarding the verification process can be found at https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance!

That's good on precise, thanks

cheese in quantal depends on libgstreamer1.0 and I can not reproduce this bug on quantal.

To verify this bug, I found another bug block me, which was already reported on bug: 1132316. it said taht gstreamer1.0-pulseaudio is missing and make cheese froze when ruser try to record video.

Marking verification-done-quantal based on comment 22

The verification of this Stable Release Update has completed successfully and the package has now been released to -updates. Subsequently, the Ubuntu Stable Release Updates Team is being unsubscribed and will not receive messages about this bug report. In the event that you encounter a regression using the package from -updates please report a new bug using ubuntu-bug and tag the bug report regression-update so we can easily find any regresssions.

This bug was fixed in the package gst-plugins-good0.10 - 0.10.31-1ubuntu1.2

---------------
gst-plugins-good0.10 (0.10.31-1ubuntu1.2) precise; urgency=low

  * debian/patches/0001-fix-v4l2_munmap.patch: Cherry-pick a commit from
    upstream to resolve an issue where applications freeze when using v4l2src.
    (LP: #1041432)
 -- Iain Lane <email address hidden> Wed, 13 Feb 2013 12:52:25 +0000

This bug was fixed in the package gst-plugins-good0.10 - 0.10.31-3ubuntu1.2

---------------
gst-plugins-good0.10 (0.10.31-3ubuntu1.2) quantal; urgency=low

  * debian/patches/0001-fix-v4l2_munmap.patch: Cherry-pick a commit from
    upstream to resolve an issue where applications freeze when using v4l2src.
    (LP: #1041432)
 -- Iain Lane <email address hidden> Wed, 13 Feb 2013 12:54:56 +0000