if you go to: http://www.britneyspears.com/welcome.html the throbber (the animated mozilla) never stops. the page says "document: done" trunk build 20001108
Hmm.. works for me.
Which build and os?
Hehe...Britney Spears...throbber... never mind... Could be a related to bug 39310.
I've seen this happen, too, although it's not always reproducible on the same site. One interesting point: I saw this on http://www.zdnet.com/zdnn today and noticed that one of the ad graphics at the top of the page hadn't loaded yet. I looked at Page Info to find out where the image was coming from. And oddly enough, in the Page Info dialog, when I clicked on the corresponding image name, the image *did* appear! So for some reason, the image is available, but the main browser window wouldn't show it, and thus (I think) kept the throbber going.
This is reproducable about 9 times out of 10 on the results of a bugzilla query (which doesn't have any animated gifs) The page finishes loading, but the throbber doesn't stop. On the console, I get: "WARNING: not calling OnDataAvailable, file nsAsyncStreamListener.cpp, line 406" each time, which may or may not be related. I don't get this error on the britney spears URL, which does have an animated gif, but I do get it on slashdot, where the throbber sometimes (but not always) doesn't stop. Slashdot does have animated gif banners though. Same with the zdnet url. Is this a separate bug to the animated gif one, or is the warning message not related? I'm on Linux, so changing OS to ALL.
I have a hunch that the Warning from nsAsyncStreamListener is related to this problem. This happens when there is a failed status on the channel... not calling OnDataAvailable in this case results in not sending notifications up stream. I'll have to investigate this some more...
Afer spending yesterday doing qutie a few web searches for maths stuff (now that mathworld is down), I think theres some relation between this bug and loading dynamic pages (search engine results, slashdot, kuro5hin, bugzilla results, etc). It almost never happens on static pages, and when it does there are often animated gifs involved.
Seems that when the throbber is in this state, mozilla pegs the CPU! And, it is not just after the page loads, but also while waiting for the page to download. The CPU is pegged even before we get any socket traffic! The not calling OnDataAvailable warning results from a NS_ERROR_ABORT status on the channel. I want to understand why/how this is being set... it might reveal something about the CPU usage as well.
updating the summary...
I've just noticed that I get the WARNING with about:blank (on startup, or typing it into the location bar). The throbber does stop though - it doesn't even look like it starts in the first place.
I tried this with dynamic content: I have a simple test at http://www.inf.bme.hu/~hyp-x/test.cgi (originaly created for an other bug). It contains no images at all. It may be so that this bug occurs when the content length is unknown. The bug is also PROXY related, when I set "Direct connection to the Internet" it works okay for my page. The Britney page on the other hand behaves badly even with direct connection set, that may be due to animated gif's. So I think this is at least two different bug. Btw. I tested 2000-11-11-08 on Win98SE.
OK, it looks like this bug is partially fixed in the netscape RTM branch. That is all symptoms, except the original one, are fixed in the RTM branch. Once the two get in sync, we should hopefully see many of the symptoms go away. That being said, let's focus on the fact that the throbber doesn't stop on pages containing an animated GIF. Does anyone know if this is simply a feature? NS 4.7 doesn't behave this way, so probably it is wrong, but maybe this was intentional???
The animated gif bug was bug 39310 (mentioned in the 2000-11-09 08:20 comment). That bug now covers this issue (The summary has been changed to "progressmeter and throbber do not stop spinning after submitting a bugzilla comment"), so this should possibly be marked as a dup of that. I hope the behaviour is not intentional. OTOH bug 39310 is marked FUTURE, so...
Happens to me on 12/13 build. Possible clue: throbber stops and 'stop' button goes out when I click the scrollbar.
Marking duplicate finally *** This bug has been marked as a duplicate of 39310 ***