[LAU] How to recover from a JACK freeze?

[Paul Davis]

Sounds like a problem with the USB device driver on your system.

On Thu, Aug 17, 2017 at 11:35 PM, James Harkins <jamshark70 at zoho.com> wrote:

> Hi, been inactive for a while.
>
> I just up/cross-graded to Ubuntu Studio 16.04 -- very much enjoying it so
> far! I'm getting better USB audio performance than I could ever manage
> under plain Ubuntu (provided WiFi is off, but I can live with that for
> shows).
>
> One problem that the upgrade didn't solve is that sometimes jackd gets
> stuck and it can't be killed.
>
> Initial symptom: No audio, in or out.
>
> Secondary symptom: In qjackctl, the CPU usage number is frozen -- never
> changes.
>
> At that point:
>
> $ ps x | grep jackd
>  3140 ?        SLsl   0:16 /usr/bin/jackd -dalsa -r44100 -p1024 -n2 -D
> -Chw:Set,0 -Phw:Set
>  4458 pts/1    S+     0:00 grep --color=auto jackd
> $ kill -9 3140
> $ ps x | grep jackd
>  3140 ?        SLsl   0:16 /usr/bin/jackd -dalsa -r44100 -p1024 -n2 -D
> -Chw:Set,0 -Phw:Set
>  4460 pts/1    S+     0:00 grep --color=auto jackd
>
> "kill -9" has no effect.
>
> "sudo kill -9" has no effect.
>
> If I reboot, it takes several minutes for the system to shut down -- i.e.,
> jackd is even preventing a clean shutdown.
>
> So, the question: How do I regain control when this happens? (Ideally,
> without having to close everything.)
>
> Thanks,
> hjh
>
> _______________________________________________
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> Linux-audio-user at lists.linuxaudio.org
> https://lists.linuxaudio.org/listinfo/linux-audio-user
>
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