Kmail crash

Hi, 

https://bugs.kde.org/show_bug.cgi?id=286307

have 74 duplicated bug of this more or less , 24 user attached . 
Can someone of devel team take a look , 
for example my comment #71 

#4 lockInline (this=0x65007200610030)
at ../../src/corelib/thread/qmutex.h:187 
#5  QMutexLocker (m=0x65007200610030, this=0x7fff0d262d20) at
../../src/corelib/thread/qmutex.h:109
#6  QNetworkAccessAuthenticationManager::fetchCachedCredentials
(this=0x65007200610000, url=..., authentication=<optimized out>) at
access/qnetworkaccessauthenticationmanager.cpp:280
#7  0x00000033aaa62289 in QNetworkAccessManagerPrivate::authenticationRequired
(this=0x353fd50, backend=0x356e550, authenticator=0x7fd04c002958) at
access/qnetworkaccessmanager.cpp:1071

access/qnetworkaccessauthenticationmanager.cpp:280 for 
QNetworkAccessAuthenticationManager::fetchCachedCredentials
crash kmail ? 
many different crashes has been appear , bugs seems grown every day ,
and I don't see anyone try to fix it . 

Thanks, 
-- 
Sérgio M. B.

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