[Bug 291801] New: KMail hangs in a futex call

[Dan Vratil]

https://bugs.kde.org/show_bug.cgi?id=291801

           Summary: KMail hangs in a futex call
           Product: kmail2
           Version: 4.8
          Platform: Compiled Sources
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: NOR
         Component: general
        AssignedTo: kdepim-bugs at kde.org
        ReportedBy: dan at progdan.cz


Version:           4.8 (using Devel) 
OS:                Linux

When I try to open INBOX on an IMAP account KMail hangs. Strace
shows that it always hangs in a futex call.

I think it is caused by a race condition because when I run KMail
in strace, I'm unable to reproduce the issue (it's obviously running slower).
It only happens when I run KMail on it's own, strace -p `pidof kmail` of 
the frozen KMail then shows

$ strace -p `pidof kmail`
Process 5672 attached - interrupt to quit
futex(0x7f546fcac8a0, FUTEX_WAIT_PRIVATE, 2, NULL


It happens only with INBOX, other folders can be opened and I can switch
between emails. It freezes sometimes when I switch between emails to 
quickly (but only sometimes, does not seem to be regular).

Let me know if you need any more information.

Reproducible: Sometimes

Steps to Reproduce:
1) run KMail with IMAP account
2) open INBOX
3) KMail freezes
4) strace -p `pidof kmail` will show it hangs in futex()

Actual Results:  
KMail freezes

Expected Results:  
KMail should not freeze :)

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