pulseaudio crash when unplugging hdmi while playing audio over hdmi on Cherry Trail devices

pulseaudio crash when unplugging hdmi while playing audio over hdmi on Cherry Trail devices

[Hans de Goede]

Hi All,

First of all good news, with kernel 4.15-rc2 and alsa-lib 1.1.5
audio over hdmi works on Cherry Trail devices after selecting
the right output profile.

But when unplugging the hdmi cable pa dies. Running pa under
gdb says it gets killed with SIGKILL, so I think this is
another realtime issue where it gets killed by the kernel for
exceeding its CPU budget.

I've a log file of a run which ends with SIGKILL here:
https://fedorapeople.org/~jwrdegoede/pulseaudio-cht-hdmi.log

What stands out is a whole lot of errors / underruns after:
D: [pulseaudio] module-alsa-card.c: Jack 'HDMI/DP,pcm=1 Jack' is now unplugged
D: [pulseaudio] device-port.c: Setting port hdmi-output-1 to status no

So it seems that the problem is that pa still tries to use
the device after the unplug, even though it sees the unplug
before getting any errors.

Regards,

Hans
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Re: pulseaudio crash when unplugging hdmi while playing audio over hdmi on Cherry Trail devices

[Tanu Kaskinen]

On Tue, 2017-12-12 at 11:39 +0100, Hans de Goede wrote:
> Hi All,
> 
> First of all good news, with kernel 4.15-rc2 and alsa-lib 1.1.5
> audio over hdmi works on Cherry Trail devices after selecting
> the right output profile.
> 
> But when unplugging the hdmi cable pa dies. Running pa under
> gdb says it gets killed with SIGKILL, so I think this is
> another realtime issue where it gets killed by the kernel for
> exceeding its CPU budget.
> 
> I've a log file of a run which ends with SIGKILL here:
> https://fedorapeople.org/~jwrdegoede/pulseaudio-cht-hdmi.log
> 
> What stands out is a whole lot of errors / underruns after:
> D: [pulseaudio] module-alsa-card.c: Jack 'HDMI/DP,pcm=1 Jack' is now unplugged
> D: [pulseaudio] device-port.c: Setting port hdmi-output-1 to status no
> 
> So it seems that the problem is that pa still tries to use
> the device after the unplug, even though it sees the unplug
> before getting any errors.

PA keeps using the device, because the card has no better ports
available. I think it would be good to switch to the off profile in
this situation, but I think it would be more beneficial to finally fix
that infinite loop. I'll try to make a patch for that.

-- 
Tanu

https://www.patreon.com/tanuk
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Re: pulseaudio crash when unplugging hdmi while playing audio over hdmi on Cherry Trail devices

[Tanu Kaskinen]

On Fri, 2017-12-15 at 05:23 +0200, Tanu Kaskinen wrote:
> On Tue, 2017-12-12 at 11:39 +0100, Hans de Goede wrote:
> > Hi All,
> > 
> > First of all good news, with kernel 4.15-rc2 and alsa-lib 1.1.5
> > audio over hdmi works on Cherry Trail devices after selecting
> > the right output profile.
> > 
> > But when unplugging the hdmi cable pa dies. Running pa under
> > gdb says it gets killed with SIGKILL, so I think this is
> > another realtime issue where it gets killed by the kernel for
> > exceeding its CPU budget.
> > 
> > I've a log file of a run which ends with SIGKILL here:
> > https://fedorapeople.org/~jwrdegoede/pulseaudio-cht-hdmi.log
> > 
> > What stands out is a whole lot of errors / underruns after:
> > D: [pulseaudio] module-alsa-card.c: Jack 'HDMI/DP,pcm=1 Jack' is now unplugged
> > D: [pulseaudio] device-port.c: Setting port hdmi-output-1 to status no
> > 
> > So it seems that the problem is that pa still tries to use
> > the device after the unplug, even though it sees the unplug
> > before getting any errors.
> 
> PA keeps using the device, because the card has no better ports
> available. I think it would be good to switch to the off profile in
> this situation, but I think it would be more beneficial to finally fix
> that infinite loop. I'll try to make a patch for that.

Patches submitted:
https://patchwork.freedesktop.org/patch/195092/
https://patchwork.freedesktop.org/patch/195091/
https://patchwork.freedesktop.org/patch/195093/

-- 
Tanu

https://www.patreon.com/tanuk
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