linux-kernel - Re: Fwd: in linux 6.3.7-200.fc38.x86_64 goes vlc in time to switch tv channels to zombie-process

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Message-ID: <3ca18d1d-c286-183b-10fe-f7e9fc42c41a@xs4all.nl>
Date:   Thu, 31 Aug 2023 13:47:37 +0200
From:   Hans Verkuil <hverkuil@...all.nl>
To:     Thorsten Leemhuis <regressions@...mhuis.info>,
        Linux regressions mailing list <regressions@...ts.linux.dev>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Media <linux-media@...r.kernel.org>,
        Linux Stable <stable@...r.kernel.org>
Subject: Re: Fwd: in linux 6.3.7-200.fc38.x86_64 goes vlc in time to switch tv
 channels to zombie-process

On 31/08/2023 13:00, Thorsten Leemhuis wrote:
> On 31.08.23 12:35, Hans Verkuil wrote:
>> On 31/08/2023 11:26, Linux regression tracking #update (Thorsten Leemhuis) wrote:
>>> [TLDR: This mail in primarily relevant for Linux kernel regression
>>> tracking. See link in footer if these mails annoy you.]
>>>
>>> On 19.06.23 02:24, Bagas Sanjaya wrote:
>>>>
>>>> I notice a regression report on Bugzilla [1]. Quoting from it:
>>>> [...]
>>>>
>>>> #regzbot introduced: v6.3.5..v6.3.7 https://bugzilla.kernel.org/show_bug.cgi?id=217566
>>>> #regzbot title: switching TV channel causes VLC and firmware loading hang
>>>
>>> #regzbot fix: 7cfab4c9dc09ca3a9d57c187894055a22bdcd
>>> #regzbot ignore-activity
>>>
>>> Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat)
>>> --
>>> Everything you wanna know about Linux kernel regression tracking:
>>> https://linux-regtracking.leemhuis.info/about/#tldr
>>> That page also explains what to do if mails like this annoy you.
>>
>> >From what I can gather from the bugzilla report, whatever the issue was appears
>> to be resolved or at least improved in later kernels.
> 
> I'm pretty (but not 100%) sure the initial report in that ticket were
> issues caused by a backport of a patch that was reverted later:
> https://lore.kernel.org/all/20230609082238.3671398-1-mchehab@kernel.org/

Ah, you have a better memory than I have. That might well be the culprit.
I didn't check for changes in the dvb core, I should have done that.

That patch was introduced in 6.3.7 and reverted in 6.3.9.

That doesn't quite match the "#regzbot introduced: v6.3.5..v6.3.7" report,
though. I wonder if fedora backported that problematic patch to their v6.3.5
release?

Regards,

	Hans

> 
> The versions when the problems started and some feedback in the ticket
> when things started working again (like
> https://bugzilla.kernel.org/show_bug.cgi?id=217566#c15 – 6.3.9 was when
> the revert came to 6.3.y) are strong indicators for that.
> 
> But yes, more people showed up in the ticket with problems that might or
> might not be related to the initial problem and things got confusing. I
> told them to report those problems separately. Ideally somebody would
> look into that and check if they did, yes, but I chose to ignore things
> at that point, as regression tracking is quite hard already and I have
> to draw lines somewhere. I often hate that, but otherwise I don't get
> much work done. :-/
> 
> Ciao, Thorsten