Ben Kelly [:bkelly, not reviewing] Reporter
	Description • 8 years ago

STR:

1) Launch a fresh firefox for android process.
2) Navigate to m.trulia.com
3) Click on a property
4) Scroll down the property page
5) Close the trulia window
6) Open about:memory
7) Click minimize memory usage
8) Click measure

At this point you should see an entry like:

  top(none)/detached
    window(http://m.trulia.com/property/...)

	Ben Kelly [:bkelly, not reviewing] Reporter
	Comment 1 • 8 years ago

I tried with Settings > Advanced > Plugins set to disabled, but it still leaked.  So its probably not flash.

	Ben Kelly [:bkelly, not reviewing] Reporter
	Comment 2 • 8 years ago

Andrew, any hints on how to hunt down the "1 unknown edge" here?

$ /c/devel/heapgraph/find_roots.py cc-edges.26140.1464481627.log 0xb7766000
Parsing cc-edges.26140.1464481627.log. Done loading graph.

0xc2fe8560 [FragmentOrElement (xhtml) div class='overlayContainer' (orphan) http://m.trulia.com/prop
erty/3222512124-400-E-54th-St-16D-New-York-NY-10022]
    --[Preserved wrapper]--> 0xc42211c0 [JS Object (HTMLDivElement)]
    --[global]--> 0xca0de160 [JS Object (Window)]
    --[UnwrapDOMObject(obj)]--> 0xb7766000 [nsGlobalWindow #204 inner http://m.trulia.com/property/3
222512124-400-E-54th-St-16D-New-York-NY-10022]

    Root 0xc2fe8560 is a ref counted object with 1 unknown edge(s).
    known edges:
       0xc59acda0 [Event] --[mEvent->target, mEvent->originalTarget]--> 0xc2fe8560
       0xc59406a0 [Touch] --[mTarget]--> 0xc2fe8560
       0xc2cfc300 [nsGenericDOMDataNode (len=5)] --[GetParent()]--> 0xc2fe8560
       0xc59ad3c0 [Event] --[mEvent->target, mEvent->originalTarget]--> 0xc2fe8560
       0xc3085510 [FragmentOrElement (xhtml) div class='line mbxs' (orphan) http://m.trulia.com/prop
erty/3222512124-400-E-54th-St-16D-New-York-NY-10022] --[GetParent()]--> 0xc2fe8560
       0xc4dd8320 [Event] --[mEvent->target, mEvent->originalTarget]--> 0xc2fe8560
       0xc42211c0 [JS Object (HTMLDivElement)] --[UnwrapDOMObject(obj)]--> 0xc2fe8560
       0xc2fe8150 [FragmentOrElement (xhtml) div class='propertyGroupCardView' (orphan) http://m.tru
lia.com/property/3222512124-400-E-54th-St-16D-New-York-NY-10022] --[mAttrsAndChildren[i]]--> 0xc2fe8
560
       0xc2e736c0 [nsGenericDOMDataNode (len=5)] --[GetParent()]--> 0xc2fe8560
       0xc59404e0 [Event] --[mEvent->target, mEvent->originalTarget]--> 0xc2fe8560
       0xc2f30240 [nsGenericDOMDataNode (len=2)] --[GetParent()]--> 0xc2fe8560
       0xc3085060 [FragmentOrElement (xhtml) div class='line mbxs' (orphan) http://m.trulia.com/prop
erty/3222512124-400-E-54th-St-16D-New-York-NY-10022] --[GetParent()]--> 0xc2fe8560
       0xc41b7820 [Touch] --[mTarget]--> 0xc2fe8560
       0xc4dd9f20 [Touch] --[mTarget]--> 0xc2fe8560
       0xc5940be0 [Touch] --[mTarget]--> 0xc2fe8560
       0xc5940710 [Event] --[mEvent->target, mEvent->originalTarget]--> 0xc2fe8560
       0xc2cdf6c0 [nsGenericDOMDataNode (len=3)] --[GetParent()]--> 0xc2fe8560
       0xc2fe85b0 [FragmentOrElement (xhtml) div class='line mbxs' (orphan) http://m.trulia.com/prop
erty/3222512124-400-E-54th-St-16D-New-York-NY-10022] --[GetParent()]--> 0xc2fe8560
       0xc4dd9c10 [Event] --[mEvent->target, mEvent->originalTarget]--> 0xc2fe8560
       0xbf96d400 [Touch] --[mTarget]--> 0xc2fe8560

	Ben Kelly [:bkelly, not reviewing] Reporter
	Comment 3 • 8 years ago

Kats, do we have any android builds handy with c++ apz?  Since I had a slow fling still active I wonder if this leak is the java apzc in fennec.

	Kartikaya Gupta (email:kats@mozilla.staktrace.com)
	Comment 4 • 8 years ago

The C++ APZ is the default in Fennec in 48+ (so currently Aurora and Nightly builds).

	Ben Kelly [:bkelly, not reviewing] Reporter
	Comment 5 • 8 years ago

Ok, I tried in latest nightly and it still reproduces.  So probably unrelated to apzc.

	Andrew McCreight [:mccr8]
	Comment 6 • 8 years ago

(In reply to Ben Kelly [:bkelly] from comment #2)
> Andrew, any hints on how to hunt down the "1 unknown edge" here?

Like Olli said, the "easiest" thing to do is to use a debugger to watch the release of this class, then exit and see what the stacks are. You can also do refcount logging, though that's a pain. DMD also can give you a snapshot of the heap and then you can dig around and try to figure out what points to the leaking object. I've never debugged a leak on Android so I don't know how it would work there.

	BMO Automation
	Comment 7 • 3 years ago

We have completed our launch of our new Firefox on Android. The development of the new versions use GitHub for issue tracking. If the bug report still reproduces in a current version of [Firefox on Android nightly](https://play.google.com/store/apps/details?id=org.mozilla.fenix) an issue can be reported at the [Fenix GitHub project](https://github.com/mozilla-mobile/fenix/). If you want to discuss your report please use [Mozilla's chat](https://wiki.mozilla.org/Matrix#Connect_to_Matrix) server https://chat.mozilla.org and join the [#fenix](https://chat.mozilla.org/#/room/#fenix:mozilla.org) channel.