I'm filing this bug on Browser-General and cc:ing radha and nisheeth. Could one of you (Radha and Nisheeth) please either take it or assign it to someone else... DESCRIPTION: I'm seeing a crash in RestoreFrameStateFor when I hit back while a page that has state to restore is loading. STEPS TO REPRODUCE: * make some bugzilla query at http://bugzilla.mozilla.org/query.cgi * let the query load fully * click on the link to a bug * let the bug load fully * comment on the bug (what I did was write some text in the textbox and mark the bug VERIFIED) * submit the form * let the page load fully * hit back, to go back to the bug * WHILE THE PAGE IS LOADING, hit back again. You need to wait until you start seeing something show up, or it won't do anything ACTUAL RESULTS: * crash EXPECTED RESULTS: * end up back at bugzilla query DOES NOT WORK CORRECTLY ON: * Linux, mozilla, 1999-11-13-08-M12 * Linux, mozilla, 1999-11-13, 05:00PDT (my tree, with SUPERWIN branch and some of my own changes) ADDITIONAL INFORMATION: Top of stack trace (from the debug build above): #0 0x40f83dc5 in RestoreFrameStateFor (aPresContext=0x83ff510, aFrame=0x8780f20, aState=0x8835c20) at nsFrameManager.cpp:1449 #1 0x40f83e99 in FrameManager::RestoreFrameState (this=0x86fce38, aPresContext=0x83ff510, aFrame=0x8780f20, aState=0x8835c20) at nsFrameManager.cpp:1467 #2 0x40fa99a0 in PresShell::ContentAppended (this=0x85c8718, aDocument=0x882f588, aContainer=0x882bf98, aNewIndexInContainer=1) at nsPresShell.cpp:2067 #3 0x4117c8b7 in nsDocument::ContentAppended (this=0x882f588, aContainer=0x882bf98, aNewIndexInContainer=1) at nsDocument.cpp:1512 #4 0x4105f2ce in nsHTMLDocument::ContentAppended (this=0x882f588, aContainer=0x882bf98, aNewIndexInContainer=1) at nsHTMLDocument.cpp:1018 #5 0x410578bf in HTMLContentSink::NotifyAppend (this=0x867c070, aContainer=0x882bf98, aStartIndex=1) at nsHTMLContentSink.cpp:3488 #6 0x41050a70 in SinkContext::CloseContainer (this=0x8812d68, aNode=@0x85ea090) at nsHTMLContentSink.cpp:1249 #7 0x4105449d in HTMLContentSink::CloseContainer (this=0x867c070, aNode=@0x85ea090) at nsHTMLContentSink.cpp:2564 #7 0x4105449d in HTMLContentSink::CloseContainer (this=0x867c070, aNode=@0x85ea090) at nsHTMLContentSink.cpp:2564 #8 0x412eddfa in CNavDTD::CloseContainer (this=0x8831248, aNode=0x85ea090, aTarget=eHTMLTag_select, aClosedByStartTag=0) at CNavDTD.cpp:2832 #9 0x412edf0c in CNavDTD::CloseContainersTo (this=0x8831248, anIndex=6, aTarget=eHTMLTag_select, aClosedByStartTag=0) at CNavDTD.cpp:2867 #10 0x412edfc7 in CNavDTD::CloseContainersTo (this=0x8831248, aTarget=eHTMLTag_select, aClosedByStartTag=0) at CNavDTD.cpp:2928 #11 0x412ebcd6 in CNavDTD::HandleEndToken (this=0x8831248, aToken=0x83a0a68) at CNavDTD.cpp:1553 #12 0x412ea221 in CNavDTD::HandleToken (this=0x8831248, aToken=0x83a0a68, aParser=0x887b310) at CNavDTD.cpp:730 #13 0x412e9ca8 in CNavDTD::BuildModel (this=0x8831248, aParser=0x887b310, aTokenizer=0x86d3548, anObserver=0x0, aSink=0x867c070) at CNavDTD.cpp:525 #14 0x412f822c in nsParser::BuildModel (this=0x887b310) at nsParser.cpp:1030 #15 0x412f80d8 in nsParser::ResumeParse (this=0x887b310, aDefaultDTD=0x0, aIsFinalChunk=0) at nsParser.cpp:956 #16 0x412f8bda in nsParser::OnDataAvailable (this=0x887b310, channel=0x8879fe0, aContext=0x0, pIStream=0x87d8e20, sourceOffset=0, aLength=6297) at nsParser.cpp:1306
I can actually get the crash without filling out the form (doesn't really surprise me). That is, click on a link from the bug, and hit back twice.
Summary: crash in restoring frame state after hitting back → [DOGFOOD]crash in restoring frame state after hitting back
Nominating for [DOGFOOD].
Putting on PDT+ radar.
Assignee: leger → karnaze
Component: Browser-General → Form Submission
QA Contact: leger → cpratt
Target Milestone: M12
Setting QA Contact.
Reassigning to Radha.
OK, Radha says that she thinks she can get this fixed within the existing Webshell world before she goes on vacation.
Simple steps to reproduce is, 1) Go to Bugzilla.mozilla.org and query on some bug 2) View the bug(I did http://bugzilla.mozilla.org/show_bug.cgi?id=18804) 3) Click on a link in the bug (I clicked on link to bug 18951) 4) Click back, 5) While 18804 is loading.(You s'd see part of the bug on the screen) click back 6) You will crash. as dbaron has described. What is happening is, when you click back in step 5) and bugzilla.mozilla.org is about to be loaded, the old history state for 18804 is deleted and a new history state is created and saved in SH. The load of 18804 is cancelled in webshell. The cancellation of the load of 18804 is done in one thread. But necko starts receiving data for the original request which was put in, in step 4, and it therefore starts calling its listeners(layout parser code) in another thread (which is the stack shown above). The parser/frame code tries to access the deleted history state and crashes. I could reproduce this bug only in pages that have lots of form values (like the bugzilla bug page) which takes longer to save and restore frame state values and there by coinciding with necko's timing to call back on its listeners. Clicking back, back quickly on the bugzilla pages doesn't crash or clicking back,back slowly in other simple pages doesn't crash. Proposed solution: ------------------ I think this can be fixed by changing the place where the old history state is deleted and the new one saved for 18804. This would involve changes in webshell and SH code both, going thro' a redesign right now. So, I would like to fix this when the new webshell is functional with the new SH. That w'd be after Dec 6 when I return from vacation.
*** Bug 18883 has been marked as a duplicate of this bug. ***
Move the completion date from "11/26" to "12/17++". Radha sez: "Fixing this involves changes in Webshell and Session History both of which are changing rapidly. ... this will be better addressed when the new world is up & running. Also, this bug happens only if you do back, back quickly before allowing the page in between to load completely. Trying to fix this now, will cause other side effects. ..." So we're gonna have to wait until the rest of Webshell lands before we can fix this. Do the PDT folks want me to move this to M13?
Moving to M13.
Adding travis to cc list. Can we make this just not crash?
I'll have Bill try to figure out why it's crashing. (Note that it doesn't crash all the time.)
I have described above why it is crashing. It is because, we delete the old history state and create a new one before we move out to another page. This is an operation we *have* to do in order for form values to retain values. Where we do this is the question. In the current webshell/SH setup I have to do it before I start loading the previous page in SH. ( which is where it is done now. ). It is when you do Back, Back quickly in a page with several form values with out allowing the page inbetween to load completely, this deletion's timing coincides with necko's OnDataAvailable() notification for the cancelled load. and we crash.
Sounds like there's not an easy hack to avoid the crash?
Summary: [DOGFOOD]crash in restoring frame state after hitting back → Crash in restoring frame state after hitting back
Whiteboard: [PDT+] 12/17?? completion
With jevering's permission ... I removed the PDT+ status of this bug since it's now targeted for M13.
*** Bug 20355 has been marked as a duplicate of this bug. ***
*** Bug 20625 has been marked as a duplicate of this bug. ***
QA Contact update.
Summary: Crash in restoring frame state after hitting back → [DOGFOOD] Crash in restoring frame state after hitting back
Per discussion with jar and based on phil's comments putting this bug back on the [DOGFOOD] radar
*** Bug 17572 has been marked as a duplicate of this bug. ***
Putting on PDT+ radar.
Summary: [DOGFOOD] Crash in restoring frame state after hitting back → [DOGFOOD][WEBSHELL]Crash in restoring frame state after hitting back
Adding [WEBSHELL] to summary line.
Whiteboard: [PDT+] → [PDT+]completion 12/15 post webshell landing
Whiteboard: [PDT+]completion 12/15 post webshell landing → [PDT+] Post webshell landing completion
*** Bug 20642 has been marked as a duplicate of this bug. ***
Whiteboard: [PDT+] Post webshell landing completion → Post webshell landing completion
Removing PDT+ status because it's obvious we're not gonna hold up dogfood for this.
Whiteboard: Post webshell landing completion → [PDT-]Post webshell landing completion
Putting on PDT- radar. spoke with don, enough of this is working at this time.
Can't check this bug until 21926 is resolved.
Summary: [DOGFOOD][WEBSHELL]Crash in restoring frame state after hitting back → [WEBSHELL] Crash in restoring frame state after hitting back
Whiteboard: [PDT-]Post webshell landing completion
*** Bug 22638 has been marked as a duplicate of this bug. ***
*** Bug 22188 has been marked as a duplicate of this bug. ***
*** Bug 22988 has been marked as a duplicate of this bug. ***
Moving all to M14 (for webshell changes that are being deferred till M14 rather than destabilize M13).
Target Milestone: M13 → M14
This appears to be working on the 2000-01-19-08 Linux Commercial build.
WORKSFORME on: - Linux6 2000-01-20-08 Commercial Build - Win98 2000-01-20-08 Commercial Build - MacOS86 2000-01-20-08 Commercial Build
Status: ASSIGNED → RESOLVED
Closed: 20 years ago
Resolution: --- → WORKSFORME
Status: RESOLVED → VERIFIED
I tried to reproduce the problem. While it no longer crashes, you get incorrect behavior. For example, I first went to www.microsoft.com. Then I navigated to www.netscape.com. While it was loading the page at netscape.com, I pressed the back button. It no longer crashed, but instead things get a bit weird in the page history. The page for www.microsoft.com is displayed correctly but the location edit box contains www.netscape.com. The next button (and arrow) is disabled and you can't navigate to www.netscape.com. If I press the back button arrow, I go back to mozilla.org. If I then push the next button (arrow), it takes me to www.netscape.com - it lost that I had gone to www.microsoft.com altogether.
Status: VERIFIED → REOPENED
Clearing WORKSFORME resolution due to reopen.
Resolution: WORKSFORME → ---
Summary: [WEBSHELL] Crash in restoring frame state after hitting back → [WEBSHELL] Wrong behavior restoring frame state after hitting back
Marking as beta1; this can be fixed with the new session history that will kick in when the webshell starts using it.
Putting on PDT+ radar for beta1.
Why not just put a flag in history to say "this page has a saved state" ?
per PDT, this is good enough progress for beta1. PDT-
Whiteboard: [PDT+] → [PDT-]
Moving to M15...
Target Milestone: M14 → M15
Status: REOPENED → ASSIGNED
Move to M16 for now ...
Target Milestone: M15 → M16
nominating for nsbeta2 based on: - severity - visibility - basic functionality broken
The SH and Webshell code that were involved in the crash are no longer used. Can someone verify if this still happens?
I tried it out on M15. While there is no crash anymore, things get confused if you rapidly click on the back and forward buttons over and over again. The sensitivity of the < and > buttons appear to get "confused". For example, I navigate to www.microsoft.com, then to www.netscape.com. I hit back, forward, back, forward ... repeatedly. After 3 or 4 iterations, the sensitivity of the forward button is disabled. If I hit back again, things sometimes get better (can navigate all the way forward to www.netscape.com again). However, eventually, it "loses" the ability to navigate to www.netscape.com via the forward button even though the forward button is enabled. After trying the whole thing again (I restarted Mozilla), I got slightly different behaviour. It reversed the www.microsoft.com and www.netscape.com in the history order.
I'm going to closr thisout, since the crash doesn't happen. Please open a new bug for other Back/forward abnormalities
Status: ASSIGNED → RESOLVED
Closed: 20 years ago → 20 years ago
Resolution: --- → FIXED
"I navigate to www.microsoft.com, then to www.netscape.com. I hit back, forward, back, forward ... repeatedly. After 3 or 4 iterations, the sensitivity of the forward button is disabled." - I think the DOJ should be informed about this one... (Sorry, I couldn't resist it.)
test windows again
Marking VERIFIED FIXED on: - MacOS9 2000-07-06-08-M17 Commercial - Linux6 2000-07-07-10-M17 Commercial - Win98 2000-07-07-13-M17 Commercial
Status: RESOLVED → VERIFIED
Component: HTML: Form Submission → DOM: Core & HTML
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