Comment 50 for bug 309297

(In reply to comment #44)
> (In reply to comment #43)
> > Ok, fixed for me on 4.2.95
>
> I can still reproduce the crash using 4.2.95 when deleting emails from imap
> folder and delete another one before queue is finished.

taking back, this was unrelated coincidence... backtrace is looking different

it seems it's related to email containing calendar invitation:

#2 <signal handler called>
#3 0x00007f02f9368ad0 in QString::operator=(QString const&) () from /usr/lib64/libQtCore.so.4
#4 0x00007f02fac87a5f in invitationsDetailsIncidence(struct KCal::Incidence *, bool) (incidence=0x2f6f810, noHtmlMode=<value optimized out>) at /usr/src/debug/kdepimlibs-4.2.95/kcal/incidenceformatter.cpp:715
#5 0x00007f02fac90a16 in invitationDetailsEvent(struct KCal::Event *, bool) (event=0x2f6f810, noHtmlMode=true) at /usr/src/debug/kdepimlibs-4.2.95/kcal/incidenceformatter.cpp:827
#6 0x00007f02fac94555 in KCal::IncidenceFormatter::InvitationBodyVisitor::visit (this=0x7fff361972a0, event=0x7fff36196d80) at /usr/src/debug/kdepimlibs-4.2.95/kcal/incidenceformatter.cpp:1272
#7 0x00007f02fac8005f in KCal::IncidenceFormatter::ScheduleMessageVisitor::act (msg=<value optimized out>, incidence=<value optimized out>, this=<value optimized out>) at /usr/src/debug/kdepimlibs-4.2.95/kcal/incidenceformatter.cpp:1227
#8 formatICalInvitationHelper(QString, struct KCal::Calendar *, KCal::InvitationFormatterHelper *, bool) (msg=<value optimized out>, incidence=<value optimized out>, this=<value optimized out>) at /usr/src/debug/kdepimlibs-4.2.95/kcal/incidenceformatter.cpp:1510
#9 0x00007f02fac80f04 in KCal::IncidenceFormatter::formatICalInvitationNoHtml (invitation=<value optimized out>, mCalendar=0x1, helper=0x233a670)
    at /usr/src/debug/kdepimlibs-4.2.95/kcal/incidenceformatter.cpp:1664
#10 0x00007f02dbdf3445 in (anonymous namespace)::Formatter::format(struct KMail::Interface::BodyPart *, struct KMail::HtmlWriter *) (this=<value optimized out>,
    bodyPart=<value optimized out>, writer=0x22fd0e0) at /usr/src/debug/kdepim-4.2.95/plugins/kmail/bodypartformatter/text_calendar.cpp:161
#11 0x00007f02fbbe3699 in KMail::ObjectTreeParser::parseObjectTree (this=0x7fff36197b20, node=0x30c5ee0) at /usr/src/debug/kdepim-4.2.95/kmail/objecttreeparser.cpp:268
#12 0x00007f02fbbe4135 in KMail::ObjectTreeParser::stdChildHandling (this=0x7fff36197e70, child=0x3156fe0) at /usr/src/debug/kdepim-4.2.95/kmail/objecttreeparser.cpp:1136
...

I can't reproduce this bug as such right now with 4.2.95