[webkit-dev] Random Failures

[Eric Seidel]

libgmalloc didn't seem to produce anything.

This seems to be a timing issue.

I was able to catch it failing in the debugger.

Program received signal EXC_BAD_ACCESS, Could not access memory.
Reason: KERN_PROTECTION_FAILURE at address: 0x00003ff3
0x01040c2c in QString::setLength ()
(gdb) bt
#0  0x01040c2c in QString::setLength ()
#1  0x010414cc in QString::insert ()
#2  0x010d75c8 in khtml::Decoder::decode ()
#3  0x0105c7b8 in KHTMLPart::write ()
#4  0x0022eda8 in -[WebDataSource(WebPrivate) _receivedData:]  
(self=0x4da3d20, _cmd=0x2ee0, data=0x4da5590) at /Volumes/Stuff/ 
Projects/WKOpen/WebKit/WebView.subproj/WebDataSource.m:818
#5  0x0024d564 in -[WebMainResourceLoader addData:] (self=0x4da8450,  
_cmd=0x2ee0, data=0x4da5590) at /Volumes/Stuff/Projects/WKOpen/WebKit/ 
WebView.subproj/WebMainResourceLoader.m:155
#6  0x0022b8e0 in -[WebLoader didReceiveData:lengthReceived:]  
(self=0x4da8450, _cmd=0x2ee0, data=0x4da5590, lengthReceived=16371)  
at /Volumes/Stuff/Projects/WKOpen/WebKit/WebView.subproj/WebLoader.m:528
#7  0x0024df14 in -[WebMainResourceLoader  
didReceiveData:lengthReceived:] (self=0x4da8450, _cmd=0x2ee0,  
data=0x4da5590, lengthReceived=0) at /Volumes/Stuff/Projects/WKOpen/ 
WebKit/WebView.subproj/WebMainResourceLoader.m:366
#8  0x0022bdd8 in -[WebLoader  
connection:didReceiveData:lengthReceived:] (self=0x0, _cmd=0x2ee0,  
con=0x0, data=0x0, lengthReceived=0) at /Volumes/Stuff/Projects/ 
WKOpen/WebKit/WebView.subproj/WebLoader.m:631
#9  0x928af7d8 in -[NSURLConnection(NSURLConnectionInternal)  
_sendDidReceiveDataCallback] ()
#10 0x928adc4c in -[NSURLConnection(NSURLConnectionInternal)  
_sendCallbacks] ()
#11 0x928ada18 in _sendCallbacks ()
#12 0x9074bd2c in __CFRunLoopDoSources0 ()
#13 0x9074b25c in __CFRunLoopRun ()
#14 0x9074acdc in CFRunLoopRunSpecific ()
#15 0x9288c164 in -[NSRunLoop runMode:beforeDate:] ()
#16 0x00002f74 in dumpRenderTree (filename=0x90a19534  
"runMode:beforeDate:") at /Volumes/Stuff/Projects/WKOpen2/WebKitTools/ 
DumpRenderTree/DumpRenderTree.m:247
#17 0x00003274 in main (argc=2, argv=0xbffff504) at /Volumes/Stuff/ 
Projects/WKOpen2/WebKitTools/DumpRenderTree/DumpRenderTree.m:95



On Jul 7, 2005, at 8:45 AM, Eric Seidel wrote:

> Thanks Mark.
>
> One next step is to try running under libgmalloc.  That should  
> catch whatever this is every time on the same test.
>
> I'll try that when I get into work.
>
> -eric
>
> On Jul 7, 2005, at 5:59 AM, Mark Rowe wrote:
>
>
>>
>> On 8/07/2005, at 00:41 , Mark Rowe wrote:
>>
>>
>>
>>> I've spent the last two hours trying to track down which change  
>>> causes the test failures + DumpRenderTree crash.  As was  
>>> mentioned, rolling out the patch for bugs #3882 and #3829 does  
>>> not resolve the issue.  Rolling out #3826 and #3674 individually  
>>> didn't help either.  It seemed that removing *both* stopped the  
>>> crashing but that may have just been luck as the crashes are  
>>> intermittent at best.  I'm retesting this scenario now.
>>>
>>>
>>
>> It seems I was just lucky...  As far as I can tell none of the  
>> four patches have any relation to the failing test + crash.  I'm  
>> not sure which other changes have been checked in recently that I  
>> could check, so I'll leave that up to someone else.
>>
>> Regards,
>>
>> Mark Rowe
>> <http://bdash.net.nz/>
>>
>>
>
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