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POjs causing firefox to crash
 

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  1. POjs causing firefox to crash
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    <p>I apologize for the vague question, but I don't know how to better describe what is happening.</p> <p>I'm developing a web app that so far is strictly coded in js (no server side code yet). I'm using an HTML 5 canvas to draw a sort of layout diagram that has click events and color coding and selecting of objects etc etc. </p> <p>I'm developing this strictly for use with Firefox (I'm using moz specific css stuff and Storage which the version of IE I have to use doesn't support.)</p> <p>Today while working on my project I started experiencing odd behavior. When loading the web page some of the content would appear (buttons, divs etc) and then Firefox would pop up a dialog stating "Firefox has stopped working" and asks if I want to "Check online for a solution and close the program" or just "Close the program". The following was in the "further details" pane:</p> <pre><code>&gt; Problem signature: Problem Event Name: APPCRASH Application &gt; Name: firefox.exe Application Version: 17.0.4.4814 Application &gt; Timestamp: 5138e84f Fault Module Name: mozjs.dll Fault Module &gt; Version: 0.0.0.0 Fault Module Timestamp: 5138d295 Exception &gt; Code: c0000005 Exception Offset: 0002171f OS &gt; Version: 6.1.7601.2.1.0.256.4 Locale ID: 1033 Additional &gt; Information 1: 0a9e Additional Information &gt; 2: 0a9e372d3b4ad19135b953a78882e789 Additional Information 3: 0a9e &gt; Additional Information 4: 0a9e372d3b4ad19135b953a78882e789 &gt; &gt; Read our privacy statement online: &gt; http://go.microsoft.com/fwlink/?linkid=104288&amp;clcid=0x0409 If the online privacy statement is not available, please read our privacy statement offline: C:\Windows\system32\en-US\erofflps.txt </code></pre> <p>I put some alert statements in my code and traced down the problem to a certain block of code. However if I step through that block (putting an alert statement in each iteration of a for loop) the code executes as expected, and Firefox doesn't crash. Firebug doesn't see anything wrong with the code either. If I take the alert away then suddenly Firefox chokes again.</p> <p>If I break that portion of code out and run it by clicking a button, then the code executes properly as well, however it's not practical for my users to have to click the button to make it work.</p> <p>I need help figuring out what I should try to zero in on the problem.</p> <p>A few things that may (I have no idea) be relevant:</p> <p>I'm loading data from about 12 different xml documents, one as big as 600KB, the rest about 20KB.</p> <p>I'm importing 15 different js libraries as well-- I can potentially reduce this number, but the functionality is broken up logically among these files, so it'll make it a little harder to develop if I have to concatenate them all together. </p> <p>I'm not using jQuery or MooTools or any other libraries like that.</p> <p>Any ideas on how to work out what's going on?</p> <p><strong>EDIT:</strong></p> <p>Here is the code for the function that it dies on. The reason I didn't post the actual code was because, as I said, the code itself executes properly when not run with the rest of the code of the page. Still, if it helps, here it is.</p> <pre><code>function GetSeatPaths(Seats){ // fills the SeatPath, ArmrestPath and SimpleSeatPath for the seat instance (used for cango drawing) for (var i =0; i&lt;Seats.length; i++){ var ThisSeat = Seats[i]; var SeatPath = ThisSeat.SeatPath; //alert("SeatCollection.prototype.GetSeatPaths: " + i); if (typeof(SeatPath) === "undefined" || SeatPath == null){ var Column = ThisSeat.Column; var Dims = ThisSeat.Dims; if (Column != "Left"){ BL = -1; } else { BL = 1; } var SeatRad = 2; try{ var seat_pax = parseInt(Dims.Seat_PAX); } catch(err){ var seat_pax = 3; } if (isNaN(seat_pax)){ var seat_pax = 3; } //Make an armrest and cushion set var SeatRad = 2; //this is the radius of the seat cushions //alert("getSeatPaths"); var CTS = 2.25; var TAR = 16; var CRP = 16.2; var BA = 18; var FOA = -2; var SBT2 = 23.2; var ACO = 45; if (Dims.hasOwnProperty('CTS')){ CTS = parseFloat(Dims.CTS.Value); } if (Dims.hasOwnProperty('TAR')){ TAR = parseFloat(Dims.TAR.Value); } if (Dims.hasOwnProperty('CRP')){ CRP = parseFloat(Dims.CRP.Value); } if (Dims.hasOwnProperty('BA')){ BA = parseFloat(Dims.BA.Value); } if (Dims.hasOwnProperty('FOA')){ FOA = parseFloat(Dims.FOA.Value); } if (Dims.hasOwnProperty('SBT2')){ SBT2 = parseFloat(Dims.SBT2.Value); } if (Dims.hasOwnProperty('ACO')){ ACO = parseFloat(Dims.ACO.Value); } SeatGeometryArr = []; ArmrestGeometryArr = []; var SeatOffset = 0 for (var j=0; j&lt;seat_pax; j++){ var CW = 17; var q = 4; if (Dims.hasOwnProperty('CW' + (j+1))){ CW = parseFloat(Dims['CW' + (j+1)].Value); } if (Dims.hasOwnProperty('q' + (j+1))){ CW = parseFloat(Dims['q' + (j+1)].Value); } SeatGeometryArr.push(['M',-CTS+SeatRad,-TAR+q/2 + SeatOffset]); SeatGeometryArr.push(['A',SeatRad,SeatRad,0,0,1,-CTS,-TAR+q/2+SeatRad + SeatOffset]); SeatGeometryArr.push(['L',-CTS,-TAR+q/2+CW-q/2-SeatRad + q/2 + SeatOffset]); SeatGeometryArr.push(['A',SeatRad,SeatRad,0,0,1,-CTS+SeatRad,-TAR+CW+q/2 + SeatOffset]); SeatGeometryArr.push(['L',CRP-SeatRad, -TAR+q/2+CW + SeatOffset]); SeatGeometryArr.push(['A',SeatRad,SeatRad,0,0,1,CRP, -TAR+q/2+CW-SeatRad + SeatOffset]); SeatGeometryArr.push(['L',CRP, -TAR+q/2+SeatRad + SeatOffset]); SeatGeometryArr.push(['A',SeatRad,SeatRad,0,0,1,CRP-SeatRad, -TAR+q/2 + SeatOffset]); SeatGeometryArr.push(['L',-CTS+SeatRad,-TAR+q/2 + SeatOffset]); SeatGeometryArr.push(['Z']); SeatGeometryArr.push(['M',CRP+SeatRad,-TAR+q/2 + SeatOffset]); SeatGeometryArr.push(['A',SeatRad,SeatRad,0,0,1,CRP,-TAR+q/2+SeatRad + SeatOffset]); SeatGeometryArr.push(['L',CRP,-TAR+q/2+CW-SeatRad + SeatOffset]); SeatGeometryArr.push(['A',SeatRad,SeatRad,0,0,1, CRP+SeatRad, -TAR+q/2+CW + SeatOffset]); SeatGeometryArr.push(['L',SBT2 - SeatRad ,-TAR+q/2+CW + SeatOffset]); SeatGeometryArr.push(['A',SeatRad,SeatRad,0,0,1, SBT2, -TAR + q/2 + CW - SeatRad + SeatOffset]); SeatGeometryArr.push(['L',SBT2,-TAR + q/2 + SeatRad+ SeatOffset]); SeatGeometryArr.push(['A',SeatRad,SeatRad,0,0,1, SBT2 - SeatRad,-TAR+q/2 + SeatOffset]); SeatGeometryArr.push(['L',CRP+SeatRad,-TAR+q/2 + SeatOffset]); SeatGeometryArr.push(['Z']); SeatOffset += CW; } //alert("Out of Cushions"); var SeatPath = FlipGeoArr(SeatGeometryArr,-BL); // Note: BL is flipped here because the geometry for the seat is defined for a RH seat // Create Armrest Geometry ArmrestGeometryArr = []; SeatOffset = 0 for (var j=0; j&lt;seat_pax+1; j++){ var CW = 17; var q = 4; if (Dims.hasOwnProperty('CW' + (j+1))){ CW = parseFloat(Dims['CW' + (j+1)].Value); } if (Dims.hasOwnProperty('q' + (j+1))){ CW = parseFloat(Dims['q' + (j+1)].Value); } ArmrestGeometryArr.push(['M',-FOA,-TAR + SeatOffset]); ArmrestGeometryArr.push(['L',-FOA,-TAR+q + SeatOffset]); ArmrestGeometryArr.push(['L',BA,-TAR+q + SeatOffset]); ArmrestGeometryArr.push(['L',BA,-TAR + SeatOffset]); ArmrestGeometryArr.push(['L',-FOA,-TAR + SeatOffset]); ArmrestGeometryArr.push(['Z']); SeatOffset += CW; } //alert("Out of Armrests"); var ArmrestPath = FlipGeoArr(ArmrestGeometryArr,-BL); // Note: BL is flipped here because the geometry for the seat is defined for a RH seat //alert("Into Simple"); // create geometry for the simplified seat SimpleSeatGeometryArr = []; SimpleSeatGeometryArr.push(['M',-CTS,-TAR]); SimpleSeatGeometryArr.push(['L',-CTS,ACO]); SimpleSeatGeometryArr.push(['L',SBT2,ACO]); SimpleSeatGeometryArr.push(['L',SBT2,-TAR]); SimpleSeatGeometryArr.push(['Z']); //alert("Out of Simple"); var SimpleSeatPath = FlipGeoArr(SimpleSeatGeometryArr,-BL); // Note: BL is flipped here because the geometry for the seat is defined for a RH seat // stick these values in for all seat instances with this part number for (var j=0; j&lt;Seats.length; j++){ if (Seats[j].PartNumber == Seats[i].PartNumber){ Seats[j].SeatPath = SeatPath; Seats[j].ArmrestPath = ArmrestPath; Seats[j].SimpleSeatPath = SimpleSeatPath; } } } } } </code></pre> <p>I thought it might be a race condition, too, so I tired using <code>window.setTimeout(functionThatBreaks,1)</code> to make sure it executed when it's dependencies were loaded, but to no avail. The same error pops up and FF dies. Is there anything else I can do, short of a user interaction to try and determine if it's a race condition?</p> <p><strong>EDIT 4-17-2013, 2:00 PM PST</strong> I revised the code above to show the changes made at the suggestion of lib3d and TheBrain. I also tried making it a regular function rather than an object prototype, still no change in the behavior.</p> <p>I also just discovered something peculiar. If I have FireBug active for the website, it runs fine. If I disable FireBug then FireFox crashes. I'm absolutely confused now.</p> <p><strong>EDIT 4-17-2013 4:05 PST</strong> It turns out I was wrong about FireBug causing issues. I can close the browser, reopen it by opening the html page from a folder on my computer and it'll fail. I can do nothing other than click "Close Window" in the Firefox failure dialog, then open the same html page, and suddenly it works.</p> <p>What might cause this sort of behavior?</p>
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    1. COYou said you narrowed the problem down to a block of code...post that.
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    2. CORace condition...? The JS code may be getting run too early.
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    3. COHave you tried [safe mode](http://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode) to exclude addon issues? If it's reproducible could you report this at [bugzilla.mozilla.org](https://bugzilla.mozilla.org/) with a stand-alone test-case or link?
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      1. USGeorg Fritzsche
 

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