926008 - java.lang.NullPointerException at org.mozilla.gecko.home.TabMenuStrip.onPageScrolled(TabMenuStrip.java:107)

Status: RESOLVED DUPLICATE of bug 926402

(Firefox for Android Graveyard :: General, defect)

Description

[Richard Newman [:rnewman]]

Pretty confident that this has nothing to do with Bug 919768, which just landed on Aurora.

This error means that setScrollingData is setting a null fromTab, which is when getChildAt(position + 1) or (position) returns null, which seems pretty likely.

These methods look quite unsafe.

Code looks unchanged on trunk.


https://tbpl.mozilla.org/php/getParsedLog.php?id=29014872&tree=Mozilla-Aurora

17:26:26     INFO -  EventExpecter: no longer listening for Gecko:Ready
17:26:26     INFO -  2 INFO TEST-PASS | testHistory | waiting for urlbar text to gain focus - urlbar text gained focus
17:26:26     INFO -  3 INFO TEST-PASS | testHistory | URL typed properly - http://mochi.test:8888/tests/robocop/robocop_blank_01.html should equal http://mochi.test:8888/tests/robocop/robocop_blank_01.html
17:26:26     INFO -  EventExpecter: no longer listening for DOMContentLoaded
17:26:26     INFO -  4 INFO TEST-PASS | testHistory | Page title is correct - Browser Blank Page 01 should equal Browser Blank Page 01
17:26:26     INFO -  5 INFO TEST-PASS | testHistory | waiting for urlbar text to gain focus - urlbar text gained focus
17:26:26     INFO -  6 INFO TEST-PASS | testHistory | URL typed properly - http://mochi.test:8888/tests/robocop/robocop_blank_02.html should equal http://mochi.test:8888/tests/robocop/robocop_blank_02.html
17:26:26     INFO -  EventExpecter: no longer listening for DOMContentLoaded
17:26:26     INFO -  7 INFO TEST-PASS | testHistory | Page title is correct - Browser Blank Page 02 should equal Browser Blank Page 02
17:26:26     INFO -  8 INFO TEST-PASS | testHistory | waiting for urlbar text to gain focus - urlbar text gained focus
17:26:26     INFO -  9 INFO TEST-PASS | testHistory | URL typed properly - http://mochi.test:8888/tests/robocop/robocop_blank_03.html should equal http://mochi.test:8888/tests/robocop/robocop_blank_03.html
17:26:26     INFO -  EventExpecter: no longer listening for DOMContentLoaded
17:26:26     INFO -  10 INFO TEST-PASS | testHistory | Page title is correct - Browser Blank Page 03 should equal Browser Blank Page 03
17:26:26     INFO -  11 INFO TEST-PASS | testHistory | waiting for urlbar text to gain focus - urlbar text gained focus
17:26:26     INFO -  INFO | automation.py | Application ran for: 0:00:44.104261
17:26:26     INFO -  INFO | zombiecheck | Reading PID log: /tmp/tmpbImNhipidlog
17:26:26     INFO -  /data/anr/traces.txt not found
17:26:26  WARNING -  PROCESS-CRASH | java-exception | java.lang.NullPointerExceptionat org.mozilla.gecko.home.TabMenuStrip.onPageScrolled(TabMenuStrip.java:107)

Comment 1

[Lucas Rocha (:lucasr)]

Steps to reproduce?

Comment 2

[Richard Newman [:rnewman]]

(In reply to Lucas Rocha (:lucasr) from comment #1)
> Steps to reproduce?

This was an exception recorded on TBPL, not in manual use. See log link in Comment 0 for full context.

This seems like a perfect bug to solve via code reading and mental simulation…

Comment 3

[Lucas Rocha (:lucasr)]

Not sure how often this is or might be happening. Nominating just in case.

Comment 4

[Mark Capella [:capella]]

java.lang.NullPointerException @ org.mozilla.gecko.home.TabMenuStrip.onPageScrolled(TabMenuStrip.java:107)

looks like DUP of Bug 926402

Comment 5

[Lucas Rocha (:lucasr)]

Indeed.