I've been getting this on Mixxx 2.2.4 (which somehow was released to
Arch Linux much sooner than the official release which was just
yesterday) for the past 5 days or so. Maybe the fact that I'm running
JACK with tighter settings and two external USB soundcards, and
streaming with OBS studio at the same time (loading my CPUs to ~35%)
makes the problem more apparent.


It seems to happen somewhat randomly when loading tracks at times of high cpu 
load. I got it on video - was streaming live, in fact (unlisted, thankfully): 
https://www.youtube.com/watch?v=RnhlpDaXFB8&t=17m14s. See at the 17:24 mark. 
The music continues to play fine (I have JACK running at RTPRIO 85 (PR -86), 
which means the mixxx client thread is PR -81. There's another thread at 
priority -2 and the remaining threads are not real-time (PR 20).

I get this on the stock Arch kernel, as well as linux-ck and linux-rt
(with/without CONFIG_HZ=1000 and other optimizations), which is to say,
it happens with all kernels and config sets.

The log file does not contain anything useful and running with
--developer also did not help. Attached backtrace according to comments
#4 and #15.

As I've been able to reproduce this consistently (with a bit of
patience), do let me know if I can be of any more help.

** Attachment added: "gdb backtrace output in 'fake' html format (to be viewed 
in a web browser with colored output)"
   
https://bugs.launchpad.net/mixxx/+bug/1789059/+attachment/5387856/+files/2020-06-28%209H37%20gdb%20mixxx.txt.html

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https://bugs.launchpad.net/bugs/1789059

Title:
  continual GUI freeze

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