Comment 45 for bug 1337873

Hello Max,

My guess (supported by a test I made in a test environment) is the cause of the problem are those lines under iface bond0:
        pre-ip ifup eth2
        pre-up ifup eth3

Those are most probably causing a deadlock, since the new release aims to fix the race condition causing the original issue (described above).
Removing those lines (and hence following the convention described in /usr/share/doc/ifenslave/README.Debian.gz) will make your configuration compatible with the supported (and documented) convention.

In your case ifupdown will be responsible for bringing eth2 and eth3 devices while setting up bond0, so you don't need to undertake any additional actions in the bond0 section - please depend on this.