[kmail2] [Bug 449891] kmail crashes on startup

[sedrubal]

https://bugs.kde.org/show_bug.cgi?id=449891

--- Comment #1 from sedrubal <kde at sedrubal.de> ---
Created attachment 146507
  --> https://bugs.kde.org/attachment.cgi?id=146507&action=edit
New crash information added by DrKonqi

kmail (5.19.2 (21.12.2)) using Qt 5.15.2

- What I was doing when the application crashed:
This issue seems to be the cause of the crash described in Bug 449898, which
results in corrupt data.

-- Backtrace (Reduced):
#4  std::__atomic_base<int>::load(std::memory_order) const
(__m=std::memory_order_relaxed, this=0x8) at
/usr/include/qt/QtCore/qrefcount.h:54
#5  QAtomicOps<int>::loadRelaxed<int>(std::atomic<int> const&) (_q_value=...)
at /usr/include/qt/QtCore/qatomic_cxx11.h:239
#6  QBasicAtomicInteger<int>::loadRelaxed() const (this=0x8) at
/usr/include/qt/QtCore/qbasicatomic.h:107
[...]
#8  QString::QString(QString const&) (this=0x7ffd48a7db20, other=...,
this=<optimized out>, other=<optimized out>) at
/usr/include/qt/QtCore/qstring.h:1094
#9  0x00007fcde918eb86 in std::_Head_base<3ul, QString,
false>::_Head_base(QString const&) (__h=..., this=0x7ffd48a7db20,
this=<optimized out>, __h=<optimized out>) at /usr/include/c++/11.1.0/tuple:182

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