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    Bug 
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    Resolution: Done
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    P2: Important 
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    5.14.2, 5.15.0
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    None
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        5
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        0180a1ab8229c6a15d19317bf7680663ac402910 (qt/qtbase/dev) 95d3fe5afa016410580fb995044cf1145c03470a (qt/tqtc-qtbase/tqtc/lts-5.15) 27cde011277b18e06de75b3369c4a13451e6c3b0 (qt/qtbase/6.0)
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        Qt6_Foundation_Sprint 23, Qt6_Foundation_Sprint 24, Qt6_Foundation_Sprint 25, Qt6_Foundation_Sprint 26
QCalendar class uses its internal containers shared across the class, such as Registry::byId and Registry::byName. But the access to those containers is not protected from multi-thread access. As a result, despite the document's "all functions in this class are reentrant" statement, this class can be used safely only form one thread.
- is duplicated by
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                    QTBUG-85692 Race in QTime::toString -         
- Closed
 
-         
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                    QTBUG-88815 QDate::FromString breaks when accessed from multiple threads using default calendar parameter -         
- Closed
 
-         
- relates to
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                    QTBUG-93004 Assert and crash in qcalendar.cpp when the first call to QDateTime::toString is done from two simultaneous threads -         
- Closed
 
-