Bug 18563

Summary: CSS Canvas leaks like a sieve
Product: WebKit Reporter: John Daggett <jdaggett>
Component: CSSAssignee: Dave Hyatt <hyatt>
Status: RESOLVED FIXED    
Severity: Major CC: hyatt
Priority: P1 Keywords: HasReduction
Version: 528+ (Nightly build)   
Hardware: Mac   
OS: OS X 10.4   
URL: http://people.mozilla.org/~jdaggett/webkitcanvascss2.html
Attachments:
Description Flags
sample dump from Activity Monitor
none
Learn2useOwnPtrProperly sam: review+

Description John Daggett 2008-04-17 19:43:17 PDT 
While fiddling with the use of a canvas image in a css background, ran into a browser hang.  

Steps:

1. Load URL with latest nightly
2. Let run for a few minutes.

Result: background goes away, only text shows and browser hangs (*not* a crash, just beach ball)

In Activity Monitor, memory usage shows up at 3.55gb.  Guessing some sort of mem leak.  Process sample is attached.
Comment 1 John Daggett 2008-04-17 19:46:06 PDT 
Created attachment 20656 [details]
sample dump from Activity Monitor
Comment 2 Matt Lilek 2008-04-17 20:38:27 PDT 
Confirmed with r32016.  This example leaks horribly for me.

With MallocStackLogging turned on:
1. Started Safari with a blank home page (using ~19 MB RAM).
2. Let the testcase run for 30 seconds
3. Close the window; let it sit for 15 seconds (up to ~130 MB RAM)
4. Run leaks with the following output:
Process 28694: 39259 nodes malloced for 5581 KB
Process 28694: 1483 leaks for 130592 total leaked bytes.
Comment 3 Matt Lilek 2008-04-17 20:43:33 PDT 
The entire leaks output is 6.5 MB which bugzilla doesn't like, so I've just uploaded the file to my webserver for now: <http://mattlilek.com/files/WebKitBug18563Leaks.txt>
Comment 4 Dave Hyatt 2008-04-17 21:01:38 PDT 
Created attachment 20657 [details]
Learn2useOwnPtrProperly
Comment 5 Dave Hyatt 2008-04-17 21:07:57 PDT 
Fixed (in theory) in r32046.