1223682 - OOM crashings only just started recently

Status: RESOLVED INCOMPLETE

(Core :: General, defect)

Description

[arch.jslin]

Attachment: firefox OOM crash troubleshooting screenshots.7z

User Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:42.0) Gecko/20100101 Firefox/42.0
Build ID: 20151029151421

Steps to reproduce:

Casually browsing Facebook tab for less than an hour and Firefox resulted in OOM crash (when restarted/resumed from the last crashing, it only used less than 1GB at start, but then it very fast climbed to 2GB and everything started lagging). 

This symptom only started recently, might be right after I upgraded to 42. 

I have some screenshots and desc to each screenshot for further info:
http://imgur.com/a/NTnfL 


Actual results:

OOM crash


Expected results:

not OOM crash

Comment 1

[arch.jslin]

Attachment: memory report

I can almost feel my firefox is dying yet again, so tried to grab a memory report.

Comment 2

[arch.jslin]

Noticed the super high "heap-unclassified" usage -- 1GB of that stuff dwarfing all the heavy duty sites usages (Facebook, Google+, several Gmail web clients)

Comment 3

[Wayne Mery (:wsmwk)]

lacks testcase or anything to reproduce