Freeze on Google maps using the "Dig a hole" tool

• Component: CSS
• Status: RESOLVED FIXED

[Alex Stapleton]

Under the My Maps tab on google maps there is a tool called "Dig a hole through the earth", checking the box to enable this function causes WebKit to freeze for about 30 seconds.

[Alex Stapleton]

Created attachment 16242 [details]
Sample of Safari during a freeze

[David Kilzer (:ddkilzer)]

Confirmed with a local debug build of WebKit r25458 with Safari 3 Public Beta v. 3.0.3 (522.12.1) on Mac OS X 10.4.10 (8R218).  (It hangs a LOT longer on my poor PB G4!)

Note that the "Dig a hole through the Earth" feature must be added to the "My Maps" section.  It's a third-party item "Created by others".  Click the "Browser the directory" link to find and add it.

[David Kilzer (:ddkilzer)]

Created attachment 16243 [details]
Shark profile of Safari during hang

This is a shark profile of Safari while it was hanging.  Looks like most of the time was spent in WebCore::DeprecatedString::at(unsigned) const, which is suggested by the sample in Attachment #16242 [details] as well.

I have a reduction and a possible fix.

[Mark Rowe (bdash)]

<rdar://problem/5477414>

Created attachment 16268 [details]
Fix hang on accessing the empty string property of a CSSStyleDeclaration

Includes regression test.

[Darin Adler]

Comment on attachment 16268 [details]
Fix hang on accessing the empty string property of a CSSStyleDeclaration

r=me

[Sam Weinig]

Landed in r25619.