820702 - Failure in "MW0: Every app is successfully launched into the foreground"; Homescreen app fails to load

Status: RESOLVED FIXED

(Firefox OS Graveyard :: Gaia::System, defect, P1)

Description

[Chris Jones [:cjones] inactive; ni?/f?/r? if you need me]

STR
 (1) Follow the steps at https://wiki.mozilla.org/B2G/Memory_acceptance_criteria#MW0:_Every_app_is_successfully_launched_into_the_foreground_.5BPASS.5D
 (2) After step 18, the homescreen failed to load

Switching to a different app and back to homescreen, locking and unlocking the screen, repeatedly tapping where the homescreen should have been, failed to get it to reload.

Extremely bad bug.

Comment 1

[Chris Jones [:cjones] inactive; ni?/f?/r? if you need me]

We're also failing "MW2: Active call stays active" because of this bug.

Comment 2

[Chris Jones [:cjones] inactive; ni?/f?/r? if you need me]

Guys, we need an owner of this.  This bricks the device until rebooting.

Comment 3

[Dietrich Ayala (:dietrich)]

Any idea what the regression that caused this is? Can we identify and backout asap?

Comment 4

[Chris Jones [:cjones] inactive; ni?/f?/r? if you need me]

Passes
http://git.mozilla.org/?p=releases/gaia.git;a=commit;h=60f8ed91c1e02e8fd9f3197af99f3c7004afb524

Fails
http://git.mozilla.org/?p=releases/gaia.git;a=commit;h=460ba0c43e1a0c942aedf272ec0f3cbe20905ed5

Please, we need an owner of this bug.

Comment 5

[Dietrich Ayala (:dietrich)]

To Vivien for now, but awake time in CET is ending. Sent email to mgrs to see if we can assign PST & CST people.

Comment 6

[Dylan Oliver [:doliver]]

James, can you start investigation on this one?

Comment 7

[James Lal [:lightsofapollo]]

Sure I will shelf other stuff and start looking into this now.

Comment 8

[James Lal [:lightsofapollo]]

I was able to run though the MW0 case successfully with an eng otoro build from the 12-12 build. Going to try the mentioned build above to verify I can reproduce failure.

Comment 9

[James Lal [:lightsofapollo]]

On the 12-11 build it seems possible to reproduce the issue.
Upon investigating it seems like if the home screen is currently in the foreground then killed it cannot be restarted without rebooting the phone.

Its fairly easy to reproduce this by:

1. Unlocking the phone
2. Page to first set of apps
3. get pid (adb shell b2g-ps)
4. kill homescreen while it is in the foreground (adb shell kill $PID)

Comment 10

[James Lal [:lightsofapollo]]

Attachment: Pointer to Github pull request: https://github.com/mozilla-b2g/gaia/pull/7012

Pointer to Github pull-request

Comment 11

[James Lal [:lightsofapollo]]

Comment on attachment 692125 [details]
Pointer to Github pull request: https://github.com/mozilla-b2g/gaia/pull/7012

See github for comments. The STR I gave can be used to confirm if this works or not without going through the whole MW0 steps.

Comment 12

[Tim Guan-tin Chien [:timdream] (please needinfo)]

Comment on attachment 692125 [details]
Pointer to Github pull request: https://github.com/mozilla-b2g/gaia/pull/7012

r=me. I was having trouble understand your code due to diff output but read through it again I think it will work.

Comment 13

[Chris Jones [:cjones] inactive; ni?/f?/r? if you need me]

Thanks for jumping on this, James!