If we use the Connection with the Features parameters, we get a crash on the first run (when Telepathy is starting and the accounts are still connecting)

Here is the last part of the debug log, prior to the crash:

Debug: tp-qt4 0.5.13.1 DEBUG: Calling Connection::becomeReady() 
Debug: tp-qt4 0.5.13.1 DEBUG: Calling Connection::becomeReady() 
Debug: tp-qt4 0.5.13.1 DEBUG: Channel has 1 optional interfaces: ("org.freedesktop.Telepathy.Channel.Interface.Group") 
Debug: tp-qt4 0.5.13.1 DEBUG: Have initiator handle: no 
Debug: tp-qt4 0.5.13.1 DEBUG: Introspecting Channel.Interface.Group for "/org/freedesktop/Telepathy/Connection/haze/yahoo/marianmar/ContactListChannel/List/subscribe" 
Debug: tp-qt4 0.5.13.1 DEBUG: Calling Properties::GetAll(Channel.Interface.Group) 
Debug: tp-qt4 0.5.13.1 DEBUG: Channel has 1 optional interfaces: ("org.freedesktop.Telepathy.Channel.Interface.Group") 
Debug: tp-qt4 0.5.13.1 DEBUG: Have initiator handle: no 
Debug: tp-qt4 0.5.13.1 DEBUG: Introspecting Channel.Interface.Group for "/org/freedesktop/Telepathy/Connection/haze/yahoo/marianmar/ContactListChannel/List/publish" 
Debug: tp-qt4 0.5.13.1 DEBUG: Calling Properties::GetAll(Channel.Interface.Group) 
Debug: tp-qt4 0.5.13.1 DEBUG: Got reply to Properties::GetAll(Channel.Interface.Group) 
Debug: tp-qt4 0.5.13.1 DEBUG:  Found properties specified in 0.17.6 
Debug: tp-qt4 0.5.13.1 DEBUG: Request for attributes for 59 contacts 
Debug: tp-qt4 0.5.13.1 DEBUG: Introspection done before contacts done - contacts sets ready 
Debug: tp-qt4 0.5.13.1 DEBUG: Got reply to Properties::GetAll(Channel.Interface.Group) 
Debug: tp-qt4 0.5.13.1 DEBUG:  Found properties specified in 0.17.6 
Debug: tp-qt4 0.5.13.1 DEBUG: Introspection done before contacts done - contacts sets ready 
Debug: tp-qt4 0.5.13.1 DEBUG: Entering Chan::Priv::updateContacts() with 1 contacts 
Debug: tp-qt4 0.5.13.1 DEBUG: Both the MCD and the introspect queue empty for the first time. Ready! 
Debug: tp-qt4 0.5.13.1 DEBUG: Both the IS and the MCD queue empty for the first time. Ready. 
Debug: tp-qt4 0.5.13.1 DEBUG: Channel fully ready 
Debug: tp-qt4 0.5.13.1 DEBUG:  Channel type "org.freedesktop.Telepathy.Channel.Type.ContactList" 
Debug: tp-qt4 0.5.13.1 DEBUG:  Target handle 2 
Debug: tp-qt4 0.5.13.1 DEBUG:  Target handle type 3 
Debug: tp-qt4 0.5.13.1 DEBUG:  Group: flags 2048 
Debug: tp-qt4 0.5.13.1 DEBUG:  Group: Number of handle owner mappings 0 
Debug: tp-qt4 0.5.13.1 DEBUG:  Group: Number of current members 0 
Debug: tp-qt4 0.5.13.1 DEBUG:  Group: Number of local pending members 0 
Debug: tp-qt4 0.5.13.1 DEBUG:  Group: Number of remote pending members 0 
Debug: tp-qt4 0.5.13.1 DEBUG:  Group: Self handle 1 tracked: yes 
Debug: tp-qt4 0.5.13.1 DEBUG: ReadinessHelper::setIntrospectCompleted: feature: QPair("Tp::Channel",0) - success: true 
Debug: tp-qt4 0.5.13.1 DEBUG: Account::updateProperties: changed: 
Debug: tp-qt4 0.5.13.1 DEBUG:  Current Presence: 2 - "available" 
Debug: tp-qt4 0.5.13.1 DEBUG: Building self contact 
Warning: tp-qt4 0.5.13.1 WARN: ConnectionLowlevel::contactAttributeInterfaces() used with status 1 != ConnectionStatusConnected 
Debug: tp-qt4 0.5.13.1 DEBUG: 6 contact features supported using Tp::ContactManager(0x870c6d0) 
Debug: tp-qt4 0.5.13.1 DEBUG: Request for attributes for 1 contacts 
Warning: tp-qt4 0.5.13.1 WARN: ConnectionLowlevel::contactAttributes() used with status 1 != ConnectionStatusConnected 
Debug: tp-qt4 0.5.13.1 DEBUG: Building self contact: connected 
Debug: tp-qt4 0.5.13.1 DEBUG: PendingAttrs error "org.freedesktop.Telepathy.Error.NotAvailable" message "The connection isn't Connected" 
Debug: tp-qt4 0.5.13.1 DEBUG: Entering Chan::Priv::updateContacts() with 60 contacts 
Debug: tp-qt4 0.5.13.1 DEBUG: Both the MCD and the introspect queue empty for the first time. Ready! 
Debug: tp-qt4 0.5.13.1 DEBUG: Both the IS and the MCD queue empty for the first time. Ready. 
Debug: tp-qt4 0.5.13.1 DEBUG: Channel fully ready 
Debug: tp-qt4 0.5.13.1 DEBUG:  Channel type "org.freedesktop.Telepathy.Channel.Type.ContactList" 
Debug: tp-qt4 0.5.13.1 DEBUG:  Target handle 1 
Debug: tp-qt4 0.5.13.1 DEBUG:  Target handle type 3 
Debug: tp-qt4 0.5.13.1 DEBUG:  Group: flags 2055 
Debug: tp-qt4 0.5.13.1 DEBUG:  Group: Number of handle owner mappings 0 
Debug: tp-qt4 0.5.13.1 DEBUG:  Group: Number of current members 59 
Debug: tp-qt4 0.5.13.1 DEBUG:  Group: Number of local pending members 0 
Debug: tp-qt4 0.5.13.1 DEBUG:  Group: Number of remote pending members 0 
Debug: tp-qt4 0.5.13.1 DEBUG:  Group: Self handle 1 tracked: yes 
Debug: tp-qt4 0.5.13.1 DEBUG: ReadinessHelper::setIntrospectCompleted: feature: QPair("Tp::Channel",0) - success: true 
Warning: tp-qt4 0.5.13.1 WARN: Getting self contact failed with "org.freedesktop.Telepathy.Error.NotAvailable":"The connection isn't Connected"
Debug: tp-qt4 0.5.13.1 DEBUG: ReadinessHelper::setIntrospectCompleted: feature: QPair("Tp::Connection",1) - success: false 
Fatal: ASSERT: "pendingFeatures.contains(feature)" in file /root/repo/telepathy-qt4/TelepathyQt4/readiness-helper.cpp, line 243
Aborted