[pulseaudio-tickets] [Bug 87226] New: PulseAudio is interrupted for 380 milliseconds exactly every 20 minutes

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=87226

            Bug ID: 87226
           Summary: PulseAudio is interrupted for 380 milliseconds exactly
                    every 20 minutes
           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: bert.ram.aerts at gmail.com
        QA Contact: pulseaudio-bugs at lists.freedesktop.org
                CC: lennart at poettering.net

I have Mageia 4 x86_64 with all updates installed, so kernel 3.14.24.
On a Dell Inspiron 7720 17R SE laptop.

Both with speakers as with Logitech H800 wireless headphones via Bluetooth, I
have an interruption of sound during 380 milliseconds exactly every 20 minutes.

This is proven by journalctl:

Dec 02 21:12:03 Dell7720Mageia4 pulseaudio[2969]: [bluetooth]
module-bluez5-device.c: Skipping 387514 us (= 68356 bytes) in audio stream
Dec 02 21:32:04 Dell7720Mageia4 pulseaudio[2969]: [bluetooth]
module-bluez5-device.c: Skipping 387286 us (= 68316 bytes) in audio stream

Dec 03 21:08:58 Dell7720Mageia4 pulseaudio[2791]: [bluetooth]
module-bluez5-device.c: Skipping 386450 us (= 68168 bytes) in audio stream
Dec 03 21:28:58 Dell7720Mageia4 pulseaudio[2791]: [bluetooth]
module-bluez5-device.c: Skipping 391516 us (= 69060 bytes) in audio stream

How can I debug this further to find a root-cause?

I did the following, at 19 minutes 50 seconds I ran:
top -bd .1 -n 150 > top_log_3.txt
grep -A 2 COMMAND top_log_3.txt > top_log_3_grep.txt

This resulted in just at the moment of sound interrupt (2 experiments with same
result):

      PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
      601 root     -51   0     0    0    0 S    9  0.0   0:03.39 irq/46-iwlwifi
     2850 bert      20   0 3333m 138m  43m S    9  1.8   0:51.75 plasma-desktop

      PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
      607 root     -51   0     0    0    0 S    9  0.0   0:03.97 irq/46-iwlwifi
      837 root       0 -20     0    0    0 S    9  0.0   0:04.69 kworker/u17:2

But what can I conlude from this?

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