[Bug 194459] New: kio_sieve 100% cpu utilization

[Michael Kreitzer]

https://bugs.kde.org/show_bug.cgi?id=194459

           Summary: kio_sieve 100% cpu utilization
           Product: kmail
           Version: unspecified
          Platform: unspecified
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: filtering
        AssignedTo: kdepim-bugs at kde.org
        ReportedBy: mrgrim at gr1m.org


Version:            (using KDE 4.2.3)
OS:                Linux
Installed from:    Unlisted Binary Package

I caught kio_sieve eating 100% cpu for an extended period. Unfortunately I dno
not know how to reproduce, and I do not have debugging packages installed. I
got a strace showing it's stating /etc/localtime as fast as possible. Tens of
thousands of lines of:

stat("/etc/localtime", {st_mode=S_IFREG|0644, st_size=1649, ...}) = 0

The backtrace indicates this might be a Qt bug. I'm not sure, however. I'm
hoping knowing the call stack and strace line might be enough to find out
what's happening:

#0  0xffffffffff6001a7 in ?? ()
#1  0x00007fff913ff542 in ?? ()
#2  0x00007fff913ff5d6 in gettimeofday ()
#3  0x00007f74863f5caa in gettimeofday () from /lib/libc.so.6
#4  0x00007f7488ce6cc0 in QTime::currentTime () from /usr/lib/libQtCore.so.4
#5  0x00007f7488ce6da9 in QTime::start () from /usr/lib/libQtCore.so.4
#6  0x00007f74851877f8 in QSslSocket::waitForReadyRead () from
/usr/lib/libQtNetwork.so.4
#7  0x00007f7487d67bd2 in KIO::TCPSlaveBase::readLine () from
/usr/lib/libkio.so.5
#8  0x00007f748077acbe in kio_sieveProtocol::receiveData () from
/usr/lib/kde4/kio_sieve.so
#9  0x00007f748077b11b in kio_sieveProtocol::operationSuccessful () from
/usr/lib/kde4/kio_sieve.so
#10 0x00007f748077ac41 in kio_sieveProtocol::disconnect () from
/usr/lib/kde4/kio_sieve.so
#11 0x00007f7487d59f1e in KIO::SlaveBase::dispatchLoop () from
/usr/lib/libkio.so.5
#12 0x00007f748077bc91 in kdemain () from /usr/lib/kde4/kio_sieve.so
#13 0x0000000000406b1c in _start ()

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