After using kmail for a while, when I log out of my KDE session, kmail will trigger the crash handler for a signal 11 quit. I have not been able to grab any additional information about the crash - as the crash handler is terminated as part of the logout before any useful information is retrieved. I am currently using the Fedora 26 packages with updates-testing enabled. More than happy to try and debug this if suggestions can be made on how to capture the crash details.
Do you also get a crash when just closing KMail? It is a bit hard to obtain a backtrace if the crash only happens when ending the session...
Correct - to be a pain in the backside, this *only* crashes when I log out. I can open and close kmail as many times as I like within the session and am unable to trigger the crash.
I can confirm this bug. KMail 5.5.2
*** This bug has been marked as a duplicate of bug 378315 ***