https://bugs.kde.org/show_bug.cgi?id=495261
--- Comment #7 from Igor Kushnir <igor...@gmail.com> ---
(In reply to Matthew Woehlke from comment #6)
> > Could you print the value of the local variable `localFile` at crash time?
>
> Which stack frame? The QFileInfo (#16) seems to be
> `Tests/RunCMake/Graphviz/set_graph_name-check.cmake`... except I ran the
> test again and got `Tests/Environment/check_mod.cmake`. It isn't consistent.
> (Times I've just observed the file name from the parsing status, it also
> seems to always be on a `.cmake` file when it dies. This *does* make me
> suspect that the issue is related to parsing CMake, not C++. I'd be shocked
> if CMake itself doesn't have significantly more CMake-language files in the
> tree than just about anything else, which would explain why feeding KDevelop
> the CMake sources specifically is most likely to cause the crash.)
>
> That said, you'll note the above backtrace is different, and appears to be
> looking at `Source/cmXCOFF.h` (although I had to go up to #26 to get this),
> so... 🤷 The previous runs seemed to have the same trace as above. Anyway,
> if it's some sort of race, trying to get a reduced test case is probably not
> going to go well.
I concede that this looks very much like a thread safety bug. Maybe a small
program that repeatedly runs code like the following in *many* threads
concurrently would reproduce the bug?
```
QString localFile("/path/to/a/file");
QFileInfo fileInfo(localFile);
QDateTime lastModified = fileInfo.lastModified();
qCritical() << lastModified; // prevent compiler's optimizing away
```
> > Can you try to call `tzset()` once from the main thread somewhere, e.g.
> > main?
>
> How would I do that? Would I need a from-source build of KDevelop?
Either that or patch your system KDevelop version. Would be unnecessary if you
manage to create a small example that reproduces the Qt bug. You could run
`tzset()` once from the main thread of the example program then.
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