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Calling exit() before deleting the QApplication is explicitly not supported by Qt, it will lead to random crashes all over the place. See e. g. https://quickgit.kde.org/?p=konsole.git&a=commit&h=fe334292b5402ad0fd4b934291160ece9a12d953 and https://bugreports.qt.io/browse/QTBUG-48709 - Martin Tobias Holmedahl Sandsmark On Aug. 27, 2016, 9:12 a.m., Peter Wu wrote: > > ----------------------------------------------------------- > This is an automatically generated e-mail. To reply, visit: > https://git.reviewboard.kde.org/r/128761/ > ----------------------------------------------------------- > > (Updated Aug. 27, 2016, 9:12 a.m.) > > > Review request for Plasma, David Edmundson, David Faure, and Hugo Pereira Da > Costa. > > > Bugs: 356940 > https://bugs.kde.org/show_bug.cgi?id=356940 > > > Repository: oxygen > > > Description > ------- > > Since Qt 5.6.0, Qt5 applications started crashing on exit. All signs > point to this delete-on-destroy hack which was added to avoid outliving > the plugin lifetime. > > This method is wrong because the returned style is owned by the caller > (QApplication, QProxyStyle, etc) and will cleaned up when those users > are destructed. > > Copied from breeze patch https://git.reviewboard.kde.org/r/128760/ > > > Diffs > ----- > > kstyle/oxygenstyleplugin.cpp 70b90d9 > > Diff: https://git.reviewboard.kde.org/r/128761/diff/ > > > Testing > ------- > > Started `QT_STYLE_OVERRIDE=oxygen LD_LIBRARY_PATH=... QT_PLUGIN_PATH=... > wireshark -o` (an invalid option that triggers `exit(1)`) and observe a > heap-use-after free similar to the one reported in the bug. Apply this patch, > rebuild oxygen and notice that the crash is fixed. Also tested with "Testcase > (ASAN)" from bug 356940, crash is also gone. > > > Thanks, > > Peter Wu > >
