When I'm trying to download mail, the normal behaviour in KDE 4.10.x was: the IMAP resource downloads as fast as it can. However, in KDE 4.10.3 a nasty bug was introduced, so the IMAP resource doesn't download, but instead polls constantly the Akonadi status, doing nothing and making my CPU explode. This is what I'm getting through strace:

poll([{fd=3, events=POLLIN}, {fd=7, events=POLLIN}, {fd=8, events=POLLIN}, {fd=6, events=POLLIN}, {fd=9, events=POLLIN}], 5, 51) = 1 ([{fd=3, revents=POLLIN}])
read(3, "\1\0\0\0\0\0\0\0", 16)         = 8
recvfrom(6, 0x73f784, 4096, 0, 0, 0)    = -1 EAGAIN (Resource temporarily unavailable)
recvfrom(6, 0x73f784, 4096, 0, 0, 0)    = -1 EAGAIN (Resource temporarily unavailable)

Also, there are messages like these in the console.

akonadi_imap_resource_1(28661)/kdepimlibs (kimap) KIMAP::FetchJob::handleResponse: FETCH reply got truncated, skipping. 


Reproducible: Always

Steps to Reproduce:
1. Create an IMAP account with Google Mail.
2. Fetch mail.

Actual Results:  
Mail is fetched slowly, and the CPU is constantly at 100%, or even over 100% if I navigate to another folder in KMail.

Expected Results:  
Mail is fetched fast, and the CPU is used accordingly.

This is unrelated to the new Akonadi Nepomuk Feeder, but the bug was introduced with KDE 4.10.3