[Bug 1597792] [NEW] plasmashell high CPU usage (100%+)

[Larry Garfield]

Public bug reported:

After upgrading to Kubuntu 16.04, my plasmashell is acting up badly.
After startup it sometimes (but not always) freezes for long periods
before becoming responsive again.  Today, I found just plasmashell
reporting over 100% CPU usage for several minutes, although it was
responsive (albeit slowly) during that time.  It seemed to drop back
down to almost nothing entirely on its own, despite no change in what I
was doing.

At the recommendation of someone in the #KDE IRC channel, I grabbed the
attached backtrace using gdb.

The person I spoke to indicated that it seemed to be waiting on a lock
indefinitely.

This seems similar to, but not quite the same as,
https://bugs.launchpad.net/ubuntu/+source/plasma-workspace/+bug/1436552

** Affects: plasma-workspace (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "gdb: thread apply all backtrace on plasmashell"
   https://bugs.launchpad.net/bugs/1597792/+attachment/4692874/+files/backtrace.txt

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https://bugs.launchpad.net/bugs/1597792

Title:
  plasmashell high CPU usage (100%+)

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