[Bug 217434] Raspberry Pi sound: locks when running make in any ports directory

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=217434

            Bug ID: 217434
           Summary: Raspberry Pi sound: locks when running make in any
                    ports directory
           Product: Base System
           Version: CURRENT
          Hardware: arm
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: gonzo at FreeBSD.org

Quoting from bug 213687

Actually, I can reproduce the error as soon as sound is playing and at the same
time I launch "make" in some random /usr/port/*/*/ directory. After a few
seconds of compilation, I get the channel dead error.

I guess IO intensive operations make the sound driver crash. Output with sysctl
hw.snd.verbose=4

...
Jan  3 21:48:08 rpi2 kernel: pcm0: WARNING: PCMDIR_PLAY DMA completion too
fast/slow ! hwptr=4000, old=4000 delta=0 amt=0 ready=8192 free=31808
Jan  3 21:48:08 rpi2 last message repeated 19 times
Jan  3 21:48:13 rpi2 kernel: pcm0: chn_write(): pcm0:virtual:dsp0.vp0: play
interrupt timeout, channel dead
Jan  3 21:49:25 rpi2 kernel: smsc0: warning: Failed to read register 0x114
Jan  3 21:49:25 rpi2 kernel: smsc0: warning: MII read timeout

--

dev.pcm.0.starved: 0
dev.pcm.0.freebuffer: 39120
dev.pcm.0.underruns: 1
dev.pcm.0.retrieved: 20043120
dev.pcm.0.submitted: 20044000
dev.pcm.0.callbacks: 10430
dev.pcm.0.dest: 1

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