from stacktrace it appears that connection to MIR server is being rejected for some reason. Looking at the "Examples" in the errors.ubuntu.com page, seems like the condition is when dialer is being invoked with url like "tel:///<phoneNumber>"
** Also affects: qtmir (Ubuntu) Importance: Undecided Status: New ** Also affects: mir (Ubuntu) Importance: Undecided Status: New ** Changed in: dialer-app (Ubuntu) Importance: Undecided => High ** Changed in: mir (Ubuntu) Importance: Undecided => High ** Changed in: qtmir (Ubuntu) Importance: Undecided => High ** Changed in: dialer-app (Ubuntu) Assignee: (unassigned) => Gustavo Pichorim Boiko (boiko) ** Changed in: mir (Ubuntu) Assignee: (unassigned) => Kevin Gunn (kgunn) ** Changed in: canonical-devices-system-image Assignee: Bill Filler (bfiller) => Kevin Gunn (kgunn) ** Changed in: canonical-devices-system-image Assignee: Kevin Gunn (kgunn) => kevin gunn (kgunn72) ** Changed in: dialer-app (Ubuntu) Status: New => Confirmed -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to dialer-app in Ubuntu. https://bugs.launchpad.net/bugs/1468496 Title: /usr/bin/dialer- app:6:qt_message_fatal:QMessageLogger::fatal:UbuntuClientIntegration::UbuntuClientIntegration:UbuntuMirClientIntegrationPlugin::create:loadIntegration Status in Canonical System Image: Confirmed Status in dialer-app package in Ubuntu: Confirmed Status in mir package in Ubuntu: New Status in qtmir package in Ubuntu: New Bug description: The Ubuntu Error Tracker has been receiving reports about a problem regarding dialer-app. This problem was most recently seen with version 0.1+15.10.20150615-0ubuntu1, the problem page at https://errors.ubuntu.com/problem/d4b5f8e8e69986f28fd161d677a4cea7c76e4c7f contains more details. Rank 4 on errors.u.c with an increased number of reports with 0.1+15.04.20151112.1-0ubuntu1 To manage notifications about this bug go to: https://bugs.launchpad.net/canonical-devices-system-image/+bug/1468496/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp