Here's an example where I launch system-settings, create two twitter accounts, and then delete one. It freezes after the deletion. % U1_DEBUG=1 annotate-output system-settings 13:24:10 I: Started system-settings 13:24:10 E: unity::action::ActionManager::ActionManager(QObject*): 13:24:10 E: Could not determine application identifier. HUD will not work properly. 13:24:10 E: Provide your application identifier in $APP_ID environment variable. 13:24:10 E: file:///usr/lib/i386-linux-gnu/qt5/qml/Ubuntu/Components/ListItems/SingleControl.qml:59: Unable to assign [undefined] to bool 13:24:11 E: OpenGL Warning: Failed to connect to host. Make sure 3D acceleration is enabled for this VM. 13:24:11 E: libGL error: failed to load driver: vboxvideo 13:24:11 E: libGL error: Try again with LIBGL_DEBUG=verbose for more details. 13:32:39 E: virtual void OnlineAccounts::Plugin::registerTypes(const char*) Ubuntu.OnlineAccounts 13:32:40 E: WARNING: The 'gicon' image provider is deprecated and will be removed soon. Please use file:// urls for file icons, and the 'theme' image provider for themed icons (image://theme/iconname,fallback1,fallback2). 13:32:40 E: account-service-model.cpp 275 update 13:32:46 E: account.cpp 60 setObjectHandle Accounts::Account(0xb0e9120) 13:32:46 E: account-service.cpp 100 setObjectHandle Accounts::AccountService(0xb12bb18) 13:32:46 E: account-service-model.cpp 275 update 13:32:46 E: accountService role is deprecated, use accountServiceHandle 13:32:46 E: account-service.cpp 100 setObjectHandle Accounts::AccountService(0xb0a0088) 13:32:46 E: Authenticating... 13:32:46 E: ../../../../lib/SignOn/connection-manager.cpp 106 setupSocketConnection p2p error: QDBusError("org.freedesktop.DBus.Error.FileNotFound", "Failed to connect to socket /run/user/1000/signond/socket: No such file or directory") 1 13:32:46 E: ../../../../lib/SignOn/connection-manager.cpp 132 init Peer connection unavailable, activating service 13:32:46 E: ../../../../lib/SignOn/identityimpl.cpp 96 updateState Updating state: "PendingRegistration" SignOn::IdentityImpl(0xb09f938) 13:32:46 E: ../../../../lib/SignOn/identityimpl.cpp 172 storeCredentials Storing credentials 13:32:46 E: file:///usr/lib/i386-linux-gnu/qt5/qml/Ubuntu/Components/Page.qml:155: TypeError: Cannot read property 'actionManager' of null 13:32:46 E: ../../../../lib/SignOn/connection-manager.cpp 106 setupSocketConnection p2p error: QDBusError("org.freedesktop.DBus.Error.FileNotFound", "Failed to connect to socket /run/user/1000/signond/socket: No such file or directory") 1 13:32:46 E: ../../../../lib/SignOn/connection-manager.cpp 150 init Connected to "qt_default_session_bus" 13:32:46 E: ../../../../lib/SignOn/identityimpl.cpp 96 updateState Updating state: "Ready" SignOn::IdentityImpl(0xb09f938) 13:32:46 E: ../../../../lib/SignOn/identityimpl.cpp 96 updateState Updating state: "NeedsUpdate" SignOn::IdentityImpl(0xb09f938) 13:32:46 E: ../../../../lib/SignOn/identityimpl.cpp 96 updateState Updating state: "PendingUpdate" SignOn::IdentityImpl(0xb09f938) 13:32:46 E: ../../../../lib/SignOn/identityimpl.cpp 443 infoUpdated SERVER INFO UPDATED. NeedsUpdate " 0 " 13:32:47 E: ../../../../lib/SignOn/identityimpl.cpp 346 storeCredentialsReply stored id: 101 old id: 0 13:32:47 E: ../../../../lib/SignOn/identityimpl.cpp 243 queryInfo Querying info. 13:32:47 E: ../../../../lib/SignOn/identityimpl.cpp 96 updateState Updating state: "PendingUpdate" SignOn::IdentityImpl(0xb09f938) 13:32:47 E: ../../../../lib/SignOn/identityimpl.cpp 382 getInfoReply QMap(("ACL", QVariant(QStringList, ("*") ) ) ( "AuthMethods" , QVariant(QDBusArgument, ) ) ( "Caption" , QVariant(QString, "twitter") ) ( "Id" , QVariant(uint, 101) ) ( "Owner" , QVariant(QStringList, () ) ) ( "Realms" , QVariant(QStringList, () ) ) ( "RefCount" , QVariant(int, 0) ) ( "Secret" , QVariant(QString, "") ) ( "Type" , QVariant(int, 0) ) ( "UserName" , QVariant(QString, "") ) ( "UserNameSecret" , QVariant(bool, false) ) ( "Validated" , QVariant(bool, false) ) ) 13:32:47 E: ../../../../lib/SignOn/identityimpl.cpp 96 updateState Updating state: "Ready" SignOn::IdentityImpl(0xb09f938) 13:32:47 E: Credentials stored, id: 101 13:32:47 E: account-service.cpp 384 authenticate QMap() 13:32:47 E: ../../../../lib/SignOn/identityimpl.cpp 96 updateState Updating state: "PendingRegistration" SignOn::IdentityImpl(0xa9c87c8) 13:32:47 E: ../../../../lib/SignOn/authsessionimpl.cpp 94 initInterface 13:32:47 E: ../../../../lib/SignOn/authsessionimpl.cpp 94 initInterface 13:32:47 E: ../../../../lib/SignOn/identityimpl.cpp 382 getInfoReply QMap(("ACL", QVariant(QStringList, ("*") ) ) ( "AuthMethods" , QVariant(QDBusArgument, ) ) ( "Caption" , QVariant(QString, "twitter") ) ( "Id" , QVariant(uint, 101) ) ( "Owner" , QVariant(QStringList, () ) ) ( "Realms" , QVariant(QStringList, () ) ) ( "RefCount" , QVariant(int, 0) ) ( "Secret" , QVariant(QString, "") ) ( "Type" , QVariant(int, 0) ) ( "UserName" , QVariant(QString, "") ) ( "UserNameSecret" , QVariant(bool, false) ) ( "Validated" , QVariant(bool, false) ) ) 13:32:47 E: ../../../../lib/SignOn/identityimpl.cpp 96 updateState Updating state: "Ready" SignOn::IdentityImpl(0xb09f938) 13:32:47 E: ../../../../lib/SignOn/identityimpl.cpp 96 updateState Updating state: "Ready" SignOn::IdentityImpl(0xa9c87c8) 13:33:19 E: ../../../../lib/SignOn/identityimpl.cpp 577 remoteObjectDestroyed 13:33:19 E: ../../../../lib/SignOn/identityimpl.cpp 96 updateState Updating state: "NeedsRegistration" SignOn::IdentityImpl(0xa9c87c8) 13:33:19 E: ../../../../lib/SignOn/identityimpl.cpp 577 remoteObjectDestroyed 13:33:19 E: ../../../../lib/SignOn/identityimpl.cpp 96 updateState Updating state: "NeedsRegistration" SignOn::IdentityImpl(0xb09f938) 13:33:39 E: UserName: mikemccracken 13:33:39 E: ../../../Accounts/account-service.cpp: 162 onEnabled 13:33:39 E: ../../../Accounts/account-service.cpp: 162 onEnabled 13:33:39 E: account-service-model.cpp 375 onAccountServiceEnabled true 13:33:39 E: ../../../Accounts/account-service.cpp: 169 onChanged 13:33:39 E: ../../../Accounts/account-service.cpp: 169 onChanged 13:33:39 E: ../../../Accounts/account.cpp: 626 account_store_cb Saved accunt ID: 97 13:33:39 E: ====== PLUGIN FINISHED ====== 13:33:39 E: account-service-model.cpp 343 onAccountCreated 97 13:33:39 E: accountService role is deprecated, use accountServiceHandle 13:33:39 E: account-service.cpp 100 setObjectHandle Accounts::AccountService(0xb1cbc90) 13:33:41 E: file:///usr/share/ubuntu/settings/system/qml-plugins/online-accounts/AccountsPage.qml:59:9: QML Page: Binding loop detected for property "flickable" 13:33:42 E: account.cpp 60 setObjectHandle Accounts::Account(0xb214700) 13:33:42 E: account-service.cpp 100 setObjectHandle Accounts::AccountService(0xb215e50) 13:33:42 E: account-service-model.cpp 275 update 13:33:42 E: accountService role is deprecated, use accountServiceHandle 13:33:42 E: account-service.cpp 100 setObjectHandle Accounts::AccountService(0x9a78068) 13:33:42 E: Authenticating... 13:33:42 E: ../../../../lib/SignOn/identityimpl.cpp 96 updateState Updating state: "PendingRegistration" SignOn::IdentityImpl(0x9a78be0) 13:33:42 E: ../../../../lib/SignOn/identityimpl.cpp 172 storeCredentials Storing credentials 13:33:42 E: file:///usr/lib/i386-linux-gnu/qt5/qml/Ubuntu/Components/Page.qml:155: TypeError: Cannot read property 'actionManager' of null 13:33:42 E: ../../../../lib/SignOn/identityimpl.cpp 96 updateState Updating state: "Ready" SignOn::IdentityImpl(0x9a78be0) 13:33:42 E: ../../../../lib/SignOn/identityimpl.cpp 96 updateState Updating state: "NeedsUpdate" SignOn::IdentityImpl(0x9a78be0) 13:33:42 E: ../../../../lib/SignOn/identityimpl.cpp 96 updateState Updating state: "PendingUpdate" SignOn::IdentityImpl(0x9a78be0) 13:33:42 E: ../../../../lib/SignOn/identityimpl.cpp 443 infoUpdated SERVER INFO UPDATED. NeedsUpdate " 0 " 13:33:42 E: ../../../../lib/SignOn/identityimpl.cpp 346 storeCredentialsReply stored id: 102 old id: 0 13:33:42 E: ../../../../lib/SignOn/identityimpl.cpp 243 queryInfo Querying info. 13:33:42 E: ../../../../lib/SignOn/identityimpl.cpp 96 updateState Updating state: "PendingUpdate" SignOn::IdentityImpl(0x9a78be0) 13:33:42 E: ../../../../lib/SignOn/identityimpl.cpp 382 getInfoReply QMap(("ACL", QVariant(QStringList, ("*") ) ) ( "AuthMethods" , QVariant(QDBusArgument, ) ) ( "Caption" , QVariant(QString, "twitter") ) ( "Id" , QVariant(uint, 102) ) ( "Owner" , QVariant(QStringList, () ) ) ( "Realms" , QVariant(QStringList, () ) ) ( "RefCount" , QVariant(int, 0) ) ( "Secret" , QVariant(QString, "") ) ( "Type" , QVariant(int, 0) ) ( "UserName" , QVariant(QString, "") ) ( "UserNameSecret" , QVariant(bool, false) ) ( "Validated" , QVariant(bool, false) ) ) 13:33:42 E: ../../../../lib/SignOn/identityimpl.cpp 96 updateState Updating state: "Ready" SignOn::IdentityImpl(0x9a78be0) 13:33:42 E: Credentials stored, id: 102 13:33:42 E: account-service.cpp 384 authenticate QMap() 13:33:42 E: ../../../../lib/SignOn/identityimpl.cpp 96 updateState Updating state: "PendingRegistration" SignOn::IdentityImpl(0xa8f9b50) 13:33:42 E: ../../../../lib/SignOn/authsessionimpl.cpp 94 initInterface 13:33:42 E: ../../../../lib/SignOn/authsessionimpl.cpp 94 initInterface 13:33:42 E: ../../../../lib/SignOn/identityimpl.cpp 382 getInfoReply QMap(("ACL", QVariant(QStringList, ("*") ) ) ( "AuthMethods" , QVariant(QDBusArgument, ) ) ( "Caption" , QVariant(QString, "twitter") ) ( "Id" , QVariant(uint, 102) ) ( "Owner" , QVariant(QStringList, () ) ) ( "Realms" , QVariant(QStringList, () ) ) ( "RefCount" , QVariant(int, 0) ) ( "Secret" , QVariant(QString, "") ) ( "Type" , QVariant(int, 0) ) ( "UserName" , QVariant(QString, "") ) ( "UserNameSecret" , QVariant(bool, false) ) ( "Validated" , QVariant(bool, false) ) ) 13:33:42 E: ../../../../lib/SignOn/identityimpl.cpp 96 updateState Updating state: "Ready" SignOn::IdentityImpl(0x9a78be0) 13:33:42 E: ../../../../lib/SignOn/identityimpl.cpp 96 updateState Updating state: "Ready" SignOn::IdentityImpl(0xa8f9b50) 13:33:58 E: UserName: mikemccracken 13:33:58 E: ../../../Accounts/account-service.cpp: 162 onEnabled 13:33:59 E: ../../../Accounts/account-service.cpp: 162 onEnabled 13:33:59 E: account-service-model.cpp 375 onAccountServiceEnabled true 13:33:59 E: ../../../Accounts/account-service.cpp: 169 onChanged 13:33:59 E: ../../../Accounts/account-service.cpp: 169 onChanged 13:33:59 E: account-service-model.cpp 343 onAccountCreated 98 13:33:59 E: accountService role is deprecated, use accountServiceHandle 13:33:59 E: account-service.cpp 100 setObjectHandle Accounts::AccountService(0x98226a0) 13:33:59 E: ../../../Accounts/account.cpp: 626 account_store_cb Saved accunt ID: 98 13:33:59 E: ====== PLUGIN FINISHED ====== 13:34:10 E: account role is deprecated, use accountHandle 13:34:10 E: account.cpp 60 setObjectHandle Accounts::Account(0x9a89990) 13:34:10 E: account-service-model.cpp 275 update 13:34:10 E: accountService role is deprecated, use accountServiceHandle 13:34:10 E: account-service.cpp 100 setObjectHandle Accounts::AccountService(0xb29f2b0) 13:34:14 E: Removing account... 13:34:14 E: ../../../../lib/SignOn/identityimpl.cpp 96 updateState Updating state: "PendingRegistration" SignOn::IdentityImpl(0xb2f00e8) 13:34:14 E: ../../../Accounts/account-service.cpp: 162 onEnabled 13:34:14 E: account-service-model.cpp 375 onAccountServiceEnabled false 13:34:14 E: ../../../Accounts/account-service.cpp: 162 onEnabled 13:34:14 E: ../../../Accounts/account-service.cpp: 162 onEnabled 13:34:14 E: account-service-model.cpp 375 onAccountServiceEnabled false 13:34:14 E: ../../../Accounts/account.cpp: 184 on_deleted 13:34:14 E: ../../../../lib/SignOn/identityimpl.cpp 200 remove Removing credentials. 13:34:14 E: account-service-model.cpp 350 onAccountRemoved 98 13:34:14 E: ../../../Accounts/account-service.cpp: 162 onEnabled 13:34:14 E: ../../../Accounts/account.cpp: 184 on_deleted 13:34:14 E: ../../../Accounts/account.cpp: 626 account_store_cb Saved accunt ID: 98 13:34:14 E: ../../../../lib/SignOn/identityimpl.cpp 96 updateState Updating state: "Ready" SignOn::IdentityImpl(0xb2f00e8) 13:34:14 E: ../../../../lib/SignOn/identityimpl.cpp 96 updateState Updating state: "Removed" SignOn::IdentityImpl(0xb2f00e8) 13:34:14 E: ../../../../lib/SignOn/identityimpl.cpp 443 infoUpdated SERVER INFO UPDATED. Removed " 102 " 13:34:14 E: ../../../../lib/SignOn/identityimpl.cpp 96 updateState Updating state: "Removed" SignOn::IdentityImpl(0xb2f00e8) 13:34:14 E: ====== PLUGIN FINISHED ====== 13:34:14 E: QQmlExpression: Attempted to evaluate an expression in an invalid context # NOTE: at this point it has frozen. 13:34:24 E: file:///usr/lib/i386-linux-gnu/qt5/qml/Ubuntu/Components/Page.qml:167: TypeError: Cannot call method 'updateHeaderAndToolbar' of null 13:34:24 E: file:///usr/lib/i386-linux-gnu/qt5/qml/Ubuntu/Components/Page.qml:168: TypeError: Cannot call method 'updateHeaderAndToolbar' of null 13:34:24 E: file:///usr/lib/i386-linux-gnu/qt5/qml/Ubuntu/Components/Page.qml:135: TypeError: Cannot call method 'updateHeaderAndToolbar' of null 13:34:24 E: file:///usr/lib/i386-linux-gnu/qt5/qml/Ubuntu/Components/Page.qml:71: ReferenceError: parent is not defined 13:34:24 E: file:///usr/lib/i386-linux-gnu/qt5/qml/Ubuntu/Components/Page.qml:72: ReferenceError: parent is not defined 13:34:24 E: file:///usr/lib/i386-linux-gnu/qt5/qml/Ubuntu/Components/Page.qml:73: ReferenceError: parent is not defined 13:34:24 E: file:///usr/lib/i386-linux-gnu/qt5/qml/Ubuntu/Components/PageTreeNode.qml:39: TypeError: Cannot call method 'updatePageTree' of null 13:34:24 I: Finished with exitcode 0