Open Radar

 
Summary:
Often when I open a new tab, soon after the page loads Safari will spin for many minutes. During this time CPU usage is 100% and memory grows and grows.

Steps to Reproduce:
1. Browse normally as you would throughout the day, periodically opening new tabs. (I typically keep about 5 tabs open persistently, and open more as needed.)

Expected Results:
Opening a new tab should not cause a multi-minute spin and consume 10s of gigabytes of memory.

Actual Results:
The spin that was ongoing when I started filing this eventually consumed over 58GB of memory, prompting the system "Out of memory" dialog to appear (which I had never seen before!). The spin lasted more than 5 minutes before the dialog appeared. Memory usage was climbing at about 100MB/sec. Sometimes the spin will recover before reaching this point, but usually I lose patience and force quit Safari.

Version:
OS X 10.10.3
Safari 8.0.6

Notes:
I've attached an Instruments trace of Safari while the spin was occurring. It shows near-constant allocations of NSSet and CFURL objects.

Configuration:


Attachments:
'Safari SharedLinksAddFeedController spin.trace.zip' and 'Screen Shot 2015-06-05 at 9.32.08 AM.png' were successfully uploaded.