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]

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.
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