[pulseaudio-tickets] [Bug 107144] New: Jack modules showing real-time schedule warnings on load

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Fri Jul 6 20:22:28 UTC 2018 

https://bugs.freedesktop.org/show_bug.cgi?id=107144

            Bug ID: 107144
           Summary: Jack modules showing real-time schedule warnings on
                    load
           Product: PulseAudio
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: modules
          Assignee: pulseaudio-bugs at lists.freedesktop.org
          Reporter: dagofthedofg at gmail.com
        QA Contact: pulseaudio-bugs at lists.freedesktop.org
                CC: lennart at poettering.net

Overview:

During startup the module-jack-sink and module-jack-source are showing warnings
regarding gaining real-time priority.

Steps to reproduce:

Start the jackdbus instance while the pulseaudio sound server is running.

Actual results:

Errors show up in the logs:

Jun 21 08:43:46 localhost pulseaudio[1988]: W: [pulseaudio]
module-jack-sink.c: JACK error >Cannot use real-time scheduling
(RR/15)(1: Operation not permitted)<
Jun 21 08:43:46 localhost pulseaudio[1988]: W: [pulseaudio]
module-jack-source.c: JACK error >Cannot use real-time scheduling
(RR/15)(1: Operation not permitted)<
Jun 21 08:44:40 localhost pulseaudio[2596]: W: [pulseaudio]
module-jack-sink.c: JACK error >Cannot use real-time scheduling
(RR/15)(1: Operation not permitted)<
Jun 21 08:44:40 localhost pulseaudio[2596]: W: [pulseaudio]
module-jack-source.c: JACK error >Cannot use real-time scheduling
(RR/15)(1: Operation not permitted)<

Expected Results:

No warnings to be shown

Build Date & Hardware:

$ cat /etc/fedora-release 
Fedora release 28 (Twenty Eight)
$ sudo dnf info pulseaudio-module-jack
Last metadata expiration check: 0:33:22 ago on Fri 06 Jul 2018 02:43:20 PM CDT.
Installed Packages
Name         : pulseaudio-module-jack
Version      : 11.1
Release      : 18.fc28.1
Arch         : x86_64
Size         : 63 k
Source       : pulseaudio-11.1-18.fc28.1.src.rpm
Repo         : @System
>From repo    : updates
Summary      : JACK support for the PulseAudio sound server
URL          : http://www.freedesktop.org/wiki/Software/PulseAudio
License      : LGPLv2+
Description  : JACK sink and source modules for the PulseAudio sound server.

Additional Builds and Platforms:

I am not aware of a version where this issue has not existed

Additional Information:

I have my user added to the fedora "jackuser" group which has the following
/etc/security/limits.d.conf settings:

@jackuser - rtprio 70
@jackuser - memlock 4194304

@pulse-rt - rtprio 20
@pulse-rt - nice -20

When I increase the verbosity these are the results:

I: [pulseaudio] module-jack-sink.c: Successfully connected as
'PulseAudio JACK Sink'
I: [pulseaudio] module-device-restore.c: Restoring volume for sink
jack_out: front-left: 45922 /  70%,   front-right: 45922 /  70%
I: [pulseaudio] module-device-restore.c: Restoring mute state for sink
jack_out: unmuted
W: [pulseaudio] sink.c: Default and alternate sample rates are the same.
I: [pulseaudio] sink.c: Created sink 3 "jack_out" with sample spec
float32le 2ch 48000Hz and channel map front-left,front-right
I: [pulseaudio] sink.c:     device.api = "jack"
I: [pulseaudio] sink.c:     device.description = "Jack sink
(PulseAudio JACK Sink)"
I: [pulseaudio] sink.c:     jack.client_name = "PulseAudio JACK Sink"
I: [pulseaudio] sink.c:     device.icon_name = "audio-card"
I: [pulseaudio] module-device-restore.c: Restoring volume for source
jack_out.monitor: front-left: 65536 / 100%,   front-right: 65536 /
100%
I: [pulseaudio] source.c: Created source 5 "jack_out.monitor" with
sample spec float32le 2ch 48000Hz and channel map
front-left,front-right
I: [pulseaudio] source.c:     device.description = "Monitor of Jack
sink (PulseAudio JACK Sink)"
I: [pulseaudio] source.c:     device.class = "monitor"
I: [pulseaudio] source.c:     device.icon_name = "audio-input-microphone"
I: [pulseaudio] module-jack-sink.c: JACK thread starting up.
I: [pulseaudio] core-util.c: Successfully enabled SCHED_RR scheduling
for thread, with priority 9.
I: [jack-sink] core-util.c: Successfully enabled SCHED_RR scheduling
for thread, with priority 5.
I: [pulseaudio] module-jack-sink.c: JACK buffer size changed.
I: [pulseaudio] module-jack-sink.c: JACK thread starting up.
I: [pulseaudio] core-util.c: Successfully enabled SCHED_RR scheduling
for thread, with priority 9.
W: [pulseaudio] module-jack-sink.c: JACK error >Cannot use real-time
scheduling (RR/15)(1: Operation not permitted)<
W: [pulseaudio] module-jack-sink.c: JACK error
>JackClient::AcquireSelfRealTime error<
I: [pulseaudio] module-jack-sink.c: JACK thread starting up.
I: [pulseaudio] core-util.c: Successfully enabled SCHED_RR scheduling
for thread, with priority 9.
I: [pulseaudio] module.c: Loaded "module-jack-sink" (index: #24;
argument: "connect=no channels=2").
I: [pulseaudio] module-jackdbus-detect.c: Successfully started
module-jack-sink.
I: [pulseaudio] module-jack-source.c: Successfully connected as
'PulseAudio JACK Source'
I: [pulseaudio] module-device-restore.c: Restoring volume for source
jack_in: front-left: 65536 / 100%,   front-right: 65536 / 100%
I: [pulseaudio] module-device-restore.c: Restoring mute state for
source jack_in: unmuted
W: [pulseaudio] source.c: Default and alternate sample rates are the same.
I: [pulseaudio] source.c: Created source 6 "jack_in" with sample spec
float32le 2ch 48000Hz and channel map front-left,front-right
I: [pulseaudio] source.c:     device.api = "jack"
I: [pulseaudio] source.c:     device.description = "Jack source
(PulseAudio JACK Source)"
I: [pulseaudio] source.c:     jack.client_name = "PulseAudio JACK Source"
I: [pulseaudio] source.c:     device.icon_name = "audio-input-microphone"
I: [pulseaudio] module-jack-source.c: JACK thread starting up.
I: [pulseaudio] core-util.c: Successfully enabled SCHED_RR scheduling
for thread, with priority 9.
I: [jack-source] core-util.c: Successfully enabled SCHED_RR scheduling
for thread, with priority 5.
I: [pulseaudio] module-jack-source.c: JACK thread starting up.
I: [pulseaudio] core-util.c: Successfully enabled SCHED_RR scheduling
for thread, with priority 9.
W: [pulseaudio] module-jack-source.c: JACK error >Cannot use real-time
scheduling (RR/15)(1: Operation not permitted)<
W: [pulseaudio] module-jack-source.c: JACK error
>JackClient::AcquireSelfRealTime error<
I: [pulseaudio] module-jack-source.c: JACK thread starting up.
I: [pulseaudio] core-util.c: Successfully enabled SCHED_RR scheduling
for thread, with priority 9.
I: [pulseaudio] module.c: Loaded "module-jack-source" (index: #25;
argument: "connect=no channels=2").
I: [pulseaudio] module-jackdbus-detect.c: Successfully started
module-jack-source.

Jack and pulse are able to startup just fine and everything appears to be
"functional" but due to the nature of the beast I have concerns with the module
not running at real-time priority.

I replicated the issue on a live image of Fedora 28 using the "liveuser"
ensuring that it was a member of the jackuser group with minimal configuration
changes.

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