[camera-app] mir/trust-store fails to show up the trust-store dialog when enabling location support

[Ricardo Salveti]

phablet@ubuntu-phablet:~$ system-image-cli -i
current build number: 104
device name: krillin
channel: ubuntu-touch/ubuntu-rtm/14.09-proposed
last update: 2014-10-14 14:30:18
version version: 104
version ubuntu: 20141014
version device: 20141013-0e11263
version custom: 1413152967

Flashed with --bootstrap.

Right after the first boot, or even after a reboot, camera-app freezes for a few seconds (~10-15) when enabling location support (probably because the trust-store dialog never shows up).

phablet@ubuntu-phablet:~$ ps -ef | grep trust
phablet 4139 1755 0 14:45 ? 00:00:00 /usr/bin/trust-stored-skeleton --remote-agent DBusRemoteAgent --bus=system --local-agent MirAgent --trusted-mir-socket=/var/run/user/32011/mir_socket_trusted --for-service UbuntuLocationService --with-text-domain ubuntu-location-service --store-bus session
phablet 4283 4139 3 14:45 ? 00:00:00 /usr/lib/arm-linux-gnueabihf/trust-prompt --mir_server_socket fd://15 --title camera --description camera wants to access your current location.

[Ricardo Salveti (rsalveti)]

phablet@ubuntu-phablet:~$ cat ./.cache/upstart/ubuntu-location-service-trust-stored.log
reattempt connection to mir...
reattempt connection to mir...
reattempt connection to mir...
reattempt connection to mir...
Error during initialization and startup: Dynamic exception type: N4core5trust3mir20InvalidMirConnectionE
std::exception::what: Cannot create instance for invalid connection to Mir.

reattempt connection to mir...
reattempt connection to mir...
reattempt connection to mir...
reattempt connection to mir...
Error during initialization and startup: Dynamic exception type: N4core5trust3mir20InvalidMirConnectionE
std::exception::what: Cannot create instance for invalid connection to Mir.

reattempt connection to mir...
reattempt connection to mir...
/usr/lib/arm-linux-gnueabihf/trust-prompt: unrecognized option '--mir_server_socket'
/usr/lib/arm-linux-gnueabihf/trust-prompt: unrecognized option '--title'
/usr/lib/arm-linux-gnueabihf/trust-prompt: unrecognized option '--description'
UbuntuWindow - regular geometry

[Alberto Aguirre (albaguirre)]

Yes I can replicate this - you have to start the camera app right after rebooting.

Attempting a workaround here: lp:~albaguirre/qtubuntu-sensors/fix-1381105 prevents the freeze but the trust-store prompt is never shown.

It looks like com::ubuntu::location::service::Stub::create_session_for_criteria times out:

http://pastebin.ubuntu.com/8562388/

[Alberto Aguirre (albaguirre)]

com::ubuntu::location::service::Stub::create_session_for_criteria in camera-app context may be timing out because
trusted-stored-skeleon seems to be stuck in core::trust::mir::Agent::authenticate_request_with_parameters

http://pastebin.ubuntu.com/8562429/

[Thomas Voß (thomas-voss)]

Yup, it times out because the trust-prompt started by:

  core::trust::mir::Agent::authenticate_request_with_parameters

Almost never succeeds to connect to Mir/Unity8 via its trusted socket. It seems like U8 is entirely blocked by something, probably on the graphics pipeline as a whole (but other parts might obviously cause the issue, too).