https://bugs.kde.org/show_bug.cgi?id=480052

--- Comment #6 from Paul Floyd <pjfl...@wanadoo.fr> ---
Valgrind is unlikely to cause a deadlock.

However, it can bring out race conditions. Firstly, it is considerably slower.
Secondly, it runs effectively as though there were a single CPU (similar to
Python and its GIL). So code that works by accident because one thread 'always'
does something before another can get caught out.

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