[Konsole-devel] [konsole] [Bug 344119] New: 100% CPU usage after closing konsole, after upgrading to 3.0.1/KF5.6.0 with nvidia driver

[Jonathan Ringstad]

https://bugs.kde.org/show_bug.cgi?id=344119

            Bug ID: 344119
           Summary: 100% CPU usage after closing konsole, after upgrading
                    to 3.0.1/KF5.6.0 with nvidia driver
           Product: konsole
           Version: 3.0.2
          Platform: Archlinux Packages
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: konsole-devel at kde.org
          Reporter: jwringstad at gmail.com

After upgrading to 3.0.1 and KF 5.6.0, konsole frequently eats 100% CPU usage
after closing it. Even closing all konsole windows does not remedy this issue,
but a `killall konsole` does.

I'm using the latest nvidia driver (346.35) on 64-bit arch with kwin and
compositing enabled. VSync is enabled. I'm using a dual-monitor setup.

Attaching gdb to the process and randomly backtracing it shows that almost all
the time is spent in _nv014tls () from /usr/lib/libnvidia-tls.so.346.35. I do
not have konsole compiled with debug information, so I don't know where exactly
this function is called from, but if that would help, I could recompile konsole
with debuginfo.

Reproducible: Always

Steps to Reproduce:
1. Start konsole
2. Close konsole
3. Watch CPU usage spike to 100% (doesn't happen every time, but after 4-5
times it almost always happens)

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