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Bug#1093390: linux-image-6.1.0-30-amd64: Audio with snd_pcm_oss choppy with -29 and -30; <= -28 is fine

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Hello Jason,

On Fri, Jan 17, 2025 at 05:25:20PM -0500, Jason McCormick wrote:
> Package: src:linux
> Version: 6.1.124-1
> Severity: important
> 
> Dear Maintainer,
> 
>    * What led up to the situation?
> 
> 	Number of Debian bookworm (stable) systems were upgraded
>     to 6.1.0-30 as part of the 12.9 release. Upon reboot,
>     Asterisk/app_rpt audo has a choppy pulse noise for any
>     played audio. Asterisk/app_rpt uses the snd_pcm_oss module
>     for USB device access.
> 
>     Example: https://www.youtube.com/watch?v=1NFvY0KV7-I
>     Forum Thread: https://community.allstarlink.org/t/after-kernel-update-debian12-asl3-distortion-choppy-audio-on-simpleusb-tx-audio-especially-telemetry/22684/50
> 
>    * What exactly did you do (or not do) that was effective (or
>      ineffective)?
> 
> 	Reverting the system to linux-images-6.1.0-28-amd64
> 
>    * What was the outcome of this action?
> 
>      Audio works as expected. Reinstalling -29 or -30
>      leads the the same artifact.

6.1.0-28 corresponds to 6.1.119 upstream
6.1.0-29 corresponds to 6.1.123 upstream
6.1.0-30 corresponds to 6.1.124 upstream

Looking through the changes beween 6.1.119 and 6.1.123 I don't spot
something obviously suspicious. There were no changes in sound/core/oss.

Can you please try to bisect the problem? The relevant commit must be
between 6.1.119 and 6.1.123. So the rough procedure is:

 - init:
	git clone https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git
	cd linux
	git checkout v6.1.119
	cp /boot/config-$(uname -r) .config
	make localmodconfig
	cp .config arch/x86/configs/my_defconfig

 - test:
 	make -j10 my_defconfig bindeb-pkg
	.. install the generated kernel image and test

 - test the new end:
 	git checkout v6.1.123
	goto test
 	

Assuming also with upstream v6.1.119 is good and v6.1.123 is bad, you
can start the actual bisection:

	git bisect start v6.1.123 v6.1.119

Until the problematic commit isn't found git checks out a revision to
test in each step. Do that (i.e. build the kernel image using bindeb-pkg
like above, install and test) and depending on the outcome run:

	git bisect good

or

	git bisect bad

If a revision fails to compile or boot such that you cannot diagnose if
your problem exists, run:

	git bisect skip

After roughly 10 iterations that should identify the first bad commit.

Please report that.

Best regards
Uwe

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Bug#1093390: linux-image-6.1.0-30-amd64: Audio with snd_pcm_oss choppy with -29 and -30; <= -28 is fine Jason McCormick <jdm@packetwarriors.com> - 2025-01-17 23:40 +0100
  Bug#1093390: linux-image-6.1.0-30-amd64: Audio with snd_pcm_oss choppy with -29 and -30; <= -28 is fine Jason McCormick <jdm@packetwarriors.com> - 2025-01-18 00:30 +0100
  Bug#1093390: Now Occurring with 6.12.9+bpo-amd64 Jason McCormick <jdm@packetwarriors.com> - 2025-01-31 01:00 +0100
  Bug#1093390: linux-image-6.1.0-30-amd64: Audio with snd_pcm_oss choppy with -29 and -30; <= -28 is fine Uwe Kleine-König <u.kleine-koenig@baylibre.com> - 2025-02-12 08:40 +0100
    Bug#1093390: linux-image-6.1.0-30-amd64: Audio with snd_pcm_oss choppy with -29 and -30; <= -28 is fine Jason McCormick <jdm@packetwarriors.com> - 2025-02-12 22:10 +0100
      Bug#1093390: linux-image-6.1.0-30-amd64: Audio with snd_pcm_oss choppy with -29 and -30; <= -28 is fine Salvatore Bonaccorso <carnil@debian.org> - 2025-03-21 22:00 +0100
  Processed: Re: Bug#1093390: linux-image-6.1.0-30-amd64: Audio  with snd_pcm_oss choppy with -29 and -30; <= -28 is fine "Debian Bug Tracking System" <owner@bugs.debian.org> - 2025-03-21 22:00 +0100
  Bug#1093390: marked as done (linux-image-6.1.0-30-amd64: Audio  with snd_pcm_oss choppy with -29 and -30; <= -28 is fine) "Debian Bug Tracking System" <owner@bugs.debian.org> - 2025-04-24 15:10 +0200

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