[kmail2] [Bug 361109] New: kmail freezes with high cpu usage when sending signed messages with attachments

[Christopher Suttles via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=361109

            Bug ID: 361109
           Summary: kmail freezes with high cpu usage when sending signed
                    messages with attachments
           Product: kmail2
           Version: 5.1
          Platform: Archlinux Packages
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: crypto
          Assignee: kdepim-bugs at kde.org
          Reporter: christopher.suttles at gmail.com

When attempting to send an signed pgp message with attachment (8MB PDF), kmail
prompts with a message box that asks "Some parts of this message will not be
signed. Sending only partially signed messages might violate site policy. Sign
all parts instead?" At this point, CPU usage hits 100%. System becomes frozen,
however mouse is still useable. Clicking "Sign All Parts" does nothing, however
clicking "Send As Is" sends the message in unencrypted form after nearly 1-2
minutes.

This seems to only happen with large attachments (greater than 5MB or so).

Reproducible: Sometimes

Steps to Reproduce:
1. Attempt to send signed pgp message with attachment 
2. At "Unsigned-Message Warning" dialog box, cpu hits 100% and system partially
freezes
3. Can only send the email successfully if "Send As Is" is clicked.

Actual Results:  
Can't send emails fully signed. Getting high cpu usage and kmail become
unresponsive for some time.

Expected Results:  
Email should be able to be sent as normal, with minimal cpu usage (or none).

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