[Bug 1783200] Re: [Lenovo Miix 310, Ubuntu 18.04] Audio no longer working

[Launchpad Bug Tracker]

[Expired for pulseaudio (Ubuntu) because there has been no activity for
60 days.]

** Changed in: pulseaudio (Ubuntu)
   Status: Incomplete => Expired

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Title:
  [Lenovo Miix 310, Ubuntu 18.04] Audio no longer working

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[Bug 1783200] Re: [Lenovo Miix 310, Ubuntu 18.04] Audio no longer working

[Daniel van Vugt]

** Tags added: realtime

** Bug watch removed: freedesktop.org Bugzilla #100488
   https://bugs.freedesktop.org/show_bug.cgi?id=100488

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Title:
  [Lenovo Miix 310, Ubuntu 18.04] Audio no longer working

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[Bug 1783200] Re: [Lenovo Miix 310, Ubuntu 18.04] Audio no longer working

[Daniel van Vugt]

That last link has moved. It's now:
https://gitlab.freedesktop.org/groups/pulseaudio/-/issues

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Title:
  [Lenovo Miix 310, Ubuntu 18.04] Audio no longer working

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[Bug 1783200] Re: [Lenovo Miix 310, Ubuntu 18.04] Audio no longer working

[Daniel van Vugt]

Great insight there about RLIMIT_RTTIME.

It appears that yes indeed pulseaudio is unique in that it has a self-
imposed RLIMIT_RTTIME of 20 microseconds. That is also configured in
/etc/pulse/daemon.conf:

; rlimit-rttime = 20

Normal processes have no such limit.

It appears you should sometimes get error messages in the pulseaudio log
somewhere along the lines of:

  Soft CPU time limit exhausted, terminating.
  Hard CPU time limit exhausted, terminating forcibly.

but certainly if the hard limit is exceeded quickly then you might see
neither of those.

Next...

1. Please send more system information by running:
 apport-collect 1783200
   or by at least sending us the CPU model details, kernel version, and output 
from `lspci -k`.

2. Report a bug to PulseAudio here:
 https://bugs.freedesktop.org/enter_bug.cgi?product=PulseAudio
   and tell us the new bug ID.


** Changed in: pulseaudio (Ubuntu)
   Importance: Undecided => High

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  [Lenovo Miix 310, Ubuntu 18.04] Audio no longer working

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[Bug 1783200] Re: [Lenovo Miix 310, Ubuntu 18.04] Audio no longer working

[Keith Gaughan]

I'm also attaching the contents of /var/log/syslog for a desktop session
with 'log-level = debug' in PA's daemon.conf file, if it helps.

** Attachment added: "syslog.pa.debug.xz"
   
https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/1783200/+attachment/5168664/+files/syslog.pa.debug.xz

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Title:
  [Lenovo Miix 310, Ubuntu 18.04] Audio no longer working

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[Bug 1783200] Re: [Lenovo Miix 310, Ubuntu 18.04] Audio no longer working

[Keith Gaughan]

I can get other processes to produce core dumps, but pulseaudio is not
producing any.

Given PA stops dying when I add 'realtime-scheduling = no' to
/etc/pulse/daemon.conf, this makes me think that the process is hitting
either RLIMIT_RTTIME or RLIMIT_CPU, which would cause the kernel to send
SIGKILL to the process when PA is scheduled (as it normally is) as a
realtime process.

While this is a relatively small machine, I would expect the OOM killer
to be a factor regardless of the value assigned to realtime-scheduling,
but it _only_ dies when PA is started as a realtime process.

I did some more experiments. For whatever reason, indicator-sound wasn't
installed (and there's no reason I would've removed it, so it's a
mystery as to why it wasn't installed). Once I installed that, with
'realtime-scheduling = yes', PA would repeatedly die, but eventually
start. With 'realtime-scheduling = no', it would start immediately.
Without indicator-sound installed, PA would start if 'realtime-
scheduling = no', but fail to start if 'realtime-scheduling = yes'.

I'm attaching the contents of /var/log/syslog in the hope that it's
useful, at least to show the behaviour I'm seeing.

** Attachment added: "/var/log/syslog"
   
https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/1783200/+attachment/5168646/+files/syslog.xz

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Title:
  [Lenovo Miix 310, Ubuntu 18.04] Audio no longer working

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[Bug 1783200] Re: [Lenovo Miix 310, Ubuntu 18.04] Audio no longer working

[Daniel van Vugt]

You're right; a SIGKILL will not leave any trace. However you also
mentioned that happened when you ran it manually so I'm wondering if
maybe a different crash is occurring when the daemon is started formally
by the system. Hoping anyway.

We need to continue on the assumption that this is a debuggable crash
and not caused by SIGKILL. So please complete the steps in comment #4.

If you can then find no further information then unfortunately you're
left to figure out what is killing the pulseaudio process. My first
guess would be maybe the kernel OOM killer, if the system is low on
memory.

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Title:
  [Lenovo Miix 310, Ubuntu 18.04] Audio no longer working

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[Bug 1783200] Re: [Lenovo Miix 310, Ubuntu 18.04] Audio no longer working

[Keith Gaughan]

I don't believe that'll work because pulseaudio is getting a SIGKILL,
not a SIGABRT, &c., so apport will never receive a coredump anyway.

I did a bit more research and came across
. I updated
/etc/pulse/daemon.conf, adding 'realtime-scheduling = no', and the
daemon was able to run. I think the issue I've been having is related to
that bug. However, the odd thing is that I recall under 17.10 being able
to plug a HDMI cable in and out without causing PA to die, so I'm not
100% sure it's exactly that issue. Regardless, I've marked
 as affecting me.

** Bug watch added: freedesktop.org Bugzilla #100488
   https://bugs.freedesktop.org/show_bug.cgi?id=100488

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Title:
  [Lenovo Miix 310, Ubuntu 18.04] Audio no longer working

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[Bug 1783200] Re: [Lenovo Miix 310, Ubuntu 18.04] Audio no longer working

[Daniel van Vugt]

Please also verify that you see no devices, or just the dummy device in:
  Settings > Sound

If pulseaudio is indeed crashing for you then that's what we need to
debug. Please:

1. Apply the workaround from bug 994921.

2. Look in /var/crash for crash files and if found run:
 ubuntu-bug YOURFILE.crash
   and tell us the ID of the newly-created bug.

3. If step 2 failed then look at https://errors.ubuntu.com/user/ID where
ID is the contents of the /var/lib/whoopsie/whoopsie-id file on the
machine. Do you find any links to recent problems on the machine? If so
then please send them to us.

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Title:
  [Lenovo Miix 310, Ubuntu 18.04] Audio no longer working

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[Bug 1783200] Re: [Lenovo Miix 310, Ubuntu 18.04] Audio no longer working

[Keith Gaughan]

Yup, pulseaudio doesn't start at all. When I run it with 'pulseaudio
-vv' to get the debug output, it ends with a SIGKILL. There's no daemon
running.

Here's a bug that I believe might be connected, and I commented on it
before: https://bugs.launchpad.net/ubuntu/+source/alsa-
driver/+bug/1759942

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  [Lenovo Miix 310, Ubuntu 18.04] Audio no longer working

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[Bug 1783200] Re: [Lenovo Miix 310, Ubuntu 18.04] Audio no longer working

[Daniel van Vugt]

Thanks for the bug report. This part of your logs looks most suspicious:

Pulseaudio:
  Installed - Yes (/usr/bin/pulseaudio)
  Running - No

Can you please take a screenshot (Alt+PrtSc) or a photo of your Settings
> Sound dialog and attach it here?

Please also open a terminal and run:
  ps auxw | grep pulse
and send us the text output (or a screenshot) of that too.

** Tags added: bionic

** Changed in: pulseaudio (Ubuntu)
   Status: New => Incomplete

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  [Lenovo Miix 310, Ubuntu 18.04] Audio no longer working

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