UIWebView crashes when its background colour is a pattern

Originator:dj
Number:rdar://10980261 Date Originated:04-Mar-2012 02:25 PM
Status:open Resolved:
Product:iPhone/iPod Touch Product Version:iOS 5.0.1 (9A405)
Classification:Crash Reproducible:Always
 
Summary:
Setting certain pattern backgrounds on a UIWebView and then loading certain URLs seems to result in massive memory usage, resulting in a crash.

Steps to Reproduce:
1) Create a project that uses a UIWebView.
2) In the code or .xib, set the backgroundColor to [UIColor viewFlipsideBackgroundColor].
3) In the code, load the following URL into the UIWebView: http://pandodaily.com/2012/02/26/steve-jobs-was-right-dropbox-is-a-feature-not-a-product/
4) Build for the iPhone and run on the device.

Expected Results:
The page should load normally.

Actual Results:
The page loads, and then after a few second the whole app crashes.

Regression:
Tested on a 16GB iPhone 4 and on a 16GB iPhone 4S.

Notes:
For your convenience I have modified the TransWeb sample app to show the bug. Just build and run that project, after replacing MyViewController.m with the version uploaded.


>>>>>

- (void)viewDidLoad
{
    webView.backgroundColor = [UIColor viewFlipsideBackgroundColor];
    NSURLRequest *requestObject = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://pandodaily.com/2012/02/26/steve-jobs-was-right-dropbox-is-a-feature-not-a-product/"]];
// Also crashes when using the following URL:
//    NSURLRequest *requestObject = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://venturebeat.com/2012/02/24/flickr-pinterest-pin/"]]; 
    [webView loadRequest:requestObject];
}

<<<<<

Comments

I have seen this same issue, but only on iPod touch 4th Gen (5.0.1), not iPhone 4S (5.0.1)

By brad at March 23, 2012, 10:20 p.m. (reply...)

(Apple asked for a crash report: I responded)

It appears that iOS is jettisoning the app because it is using too much memory; I have enclosed a low memory log.

Also, the main URL (http://pandodaily.com/2012/02/26/steve-jobs-was-right-dropbox-is-a-feature-not-a-product/)
is jettisoned consistently only when run from the Xcode debugger.

The alternative URL (http://venturebeat.com/2012/02/24/flickr-pinterest-pin/) is jettisoned even
when launched directly from SpringBoard; I will upload the altered .m file later.

BTW The low memory log is from compiling with the alternative URL for iOS 5.0 Debug
for an iPhone 4 device, and launching from SpringBoard.

>>>>>

...

Free pages:        971
Wired pages:       15654
Purgeable pages:   72
Largest process:   TransWeb

Processes
         Name                 UUID                    Count resident pages
...
        TransWeb    78099 (jettisoned) (active)

...

<<<<<

>>>>>

- (void)viewDidLoad
{
    webView.backgroundColor = [UIColor viewFlipsideBackgroundColor];
    NSURLRequest *requestObject = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://pandodaily.com/2012/02/26/steve-jobs-was-right-dropbox-is-a-feature-not-a-product/"]];
// Also crashes when using the following URL:
//    NSURLRequest *requestObject = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://venturebeat.com/2012/02/24/flickr-pinterest-pin/"]]; 
    [webView loadRequest:requestObject];
}

<<<<<
By dj at March 6, 2012, 1:37 a.m. (reply...)

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