Comment 53 for bug 707878

The same happens here.
kde-logout (and of course akonadictl stop) takes quite some time (10-20 seconds). There is no need to start kmail, to trigger this behaviour.

dmesg reports

[10709.356266] akonadi_agent_l[2381]: segfault at 7fe23cff6dd0 ip 00007fe24781b8c8 sp 00007fffb0a3fcc8 error 4 in libQtGui.so.4.7.3[7fe247412000+a8b000]
[10709.369792] akonadi_agent_l[2359]: segfault at 7f815341bdd0 ip 00007f815dc3c8c8 sp 00007fff2c0e2758 error 4 in libQtGui.so.4.7.3[7f815d833000+a8b000]
[10709.433483] akonadi_agent_l[2365]: segfault at 7fd6d7684dd0 ip 00007fd6e1ea48c8 sp 00007fff80865108 error 4 in libQtGui.so.4.7.3[7fd6e1a9b000+a8b000]
[10709.433514] akonadi_agent_l[2358]: segfault at 7f0b02e25dd0 ip 00007f0b0d6468c8 sp 00007ffffe826ba8 error 4 in libQtGui.so.4.7.3[7f0b0d23d000+a8b000]

Running
Akonadi 1.6.0
Kontact: 4.7.0

But is present since quite some time with kmail2 (can't say exactly if it was present with early betas...).