1. Load http://webkit.org 2. Cause an error page to be displayed by going to something like http://webkitt.org 3. Go back, then forward, then back again 4. WebKit prints the following assertion failure and crashes with r19022 (release builds simply display a blank page) ASSERTION FAILED: dataSource (/Users/matt/Code/WebKit/WebKit/WebView/WebHTMLView.mm:3070 -[WebHTMLView setDataSource:])
Created attachment 12598 [details] Crashlog
<rdar://problem/4944806>
Can't reproduce this any more.
See also Bug 12664.
fwiw, I can still reproduce with r19461 but since it's essentially a dupe of bug 12664, I won't reopen.