[kmail2] [Bug 375445] New: KMail2 hangs with 100% CPU usage when trying to preview or read large emails from IMAP server

[Rodney Baker]

https://bugs.kde.org/show_bug.cgi?id=375445

            Bug ID: 375445
           Summary: KMail2 hangs with 100% CPU usage when trying to
                    preview or read large emails from IMAP server
           Product: kmail2
           Version: 5.4.0
          Platform: openSUSE RPMs
                OS: Linux
            Status: UNCONFIRMED
          Severity: major
          Priority: NOR
         Component: general
          Assignee: kdepim-bugs at kde.org
          Reporter: rodney.baker at iinet.net.au
  Target Milestone: ---

KMail2 hangs when trying to read large text-based emails (~22MB Log files) from
a Dovecot IMAP server. The emails are never shown in the preview window and
KMail2 becomes unresponsive. CPU Usage for the KMail2 process goes to 100% and
stays there. Memory usage gradually increases as the email is presumably parsed
but the preview is never displayed, even after CPU usage eventually returns to
normal and KMail again becomes responsive (takes >5 minutes). 

At the same time, none of the akonadi processes show unusual CPU or memory
usage (if anything, perhaps unusually low, as if it is not actually doing a
whole lot). 

By comparison, Mozilla Thunderbird can read the same emails from the same IMAP
server and account without issues. The initial preview is shown immediately as
the rest of the message is parsed (which does take some time, but Thunderbird
remains responsive).

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