Kernel 6.5.0 with the parameter UBSAN disabled + Nvidia kernel version 535.129.03 = any kind of video flow (offline or online) is frozen at the beginning.

[Mario Marietto]

It didn't work. I've disabled the GPU acceleration on Firefox,but the video
streams move forward only if the audio is off.

On Tue, Nov 7, 2023 at 11:05 PM Mario Marietto <marietto2008 at gmail.com>
wrote:

> Firefox,Chrome = video stream ok only if audio is disabled.
> smplayer = blackscreen
> vlc = video stream ok,no audio
>
> On Tue, Nov 7, 2023 at 10:52 PM Jeffrey Walton <noloader at gmail.com> wrote:
>
>> On Tue, Nov 7, 2023 at 4:43 PM Mario Marietto <marietto2008 at gmail.com>
>> wrote:
>> >
>> > Hello.
>> >
>> > I’ve upgraded Ubuntu 23.04 to 23.10 recently. On my Ubuntu 23.10 I’m
>> using kernel 6.5.0-10-generic and I’ve installed the nVidia driver version
>> 535.129.03. (my nvidia gpu is the RTX 2080 ti ; my cpu is the intel I9). I
>> don't have exactly the same bug of this :
>> >
>> >
>> https://bugs.launchpad.net/ubuntu/+source/broadcom-sta/+bug/2030978?comments=all
>> >
>> > because the error in the Ubuntu bug report is for a different kernel
>> module. But the underlying cause is probably the same.
>> >
>> > Possibly the code for the nvidia-uvm module is designed for kernel
>> versions < 6.5, so when Ubuntu upgraded to Linux kernel 6.5, it broke some
>> modules because of changes to UBSAN in Linux 6.5 which causes modules such
>> as nvidia-uvm to need patches to be compatible with Linux 6.5, but either
>> nvidia has not yet provided a version of nvidia-uvm that is compatible with
>> Linux 6.5 or Ubuntu neglected to apply an updated version from nvidia that
>> is compatible with Linux 6.5.
>> >
>> > I didn’t see this error on Ubuntu 23.04,maybe because it does not use
>> the kernel 6.5 by default,but 23.10 does.
>> >
>> > I see a lot of those errors when I issue the command “dmesg” and any
>> audio-video streamings don’t flow.
>> >
>> > At the beginning I've thought to revert the commit in 6.5 mentioned in
>> the bug report that caused a similar problem in the broadcom-wl module:
>> >
>> > https://bugs.launchpad.net/ubuntu/+source/broadcom-sta/+bug/2030978
>> >
>> > In there it mentions the commit in 6.5.y causing the trouble:
>> >
>> > On Linux 6.5, due to commit 2d47c6956ab3 ("ubsan: Tighten
>> UBSAN_BOUNDSon GCC"), flexible trailing arrays declared like \whatever_t
>> foo[1];\will generate warnings when CONFIG_UBSAN & co. is enabled.
>> >
>> > The commit is here:
>> >
>> >
>> https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=linux-6.5.y&id=2d47c6956ab3c8b580a59d7704aab3e2a4882b6c
>> >
>> > BUT I don't use a broadcom-wl,so I've disabled the UBSAN parameter and
>> I've recompiled and installed kernel 6.5.0 and the nvidia-driver worked
>> fine :
>> >
>> > https://pastebin.ubuntu.com/p/7DYsbJwNbT/
>> >
>> > (It does not work with the kernel 6.5.3. But only with 6.5.0)
>> >
>> > # uname -a
>> > Linux Z390-AORUS-PRO-DEST 6.5.0 #1 SMP PREEMPT_DYNAMIC Tue Nov  7
>> 16:26:55 CET 2023 x86_64 x86_64 x86_64 GNU/Linux
>> >
>> > What's the problem now ?
>> >
>> > Even if I have been able to fix the previous error,at the moment I
>> can't watch any video streaming,online or offline. Simply it does not flow
>> at all. Any kind of video flow is frozen at the beginning of the stream. I
>> took a look at the dmesg messages and I saw the ugly error that you see
>> below. Maybe it is correlated with the problem :
>> >
>> > https://pastebin.ubuntu.com/p/SyhrqwKncZ/
>> >
>> > What to do ?
>> >
>> > UPDATE :
>> >
>> > I've discovered a very odd behavior. If I exclude the audio from the
>> video, the video stream moves on. If I keep the audio on, the video stream
>> freezes.
>> >
>>
>> It is not clear to me what program is having trouble. It sounds like
>> you should disable GPU acceleration until the nVidia driver is
>> updated. Or the wrinkles are ironed out.
>>
>> I'm guessing one of the problems is your web browser. In Firefox,
>> here's how you do it:
>> <
>> https://support.mozilla.org/en-US/kb/upgrade-graphics-drivers-use-hardware-acceleration#w_turning-off-hardware-acceleration
>> >.
>>
>> Jeff
>>
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>>
>
>
> --
> Mario.
>


-- 
Mario.
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