Argh! I found my error, and, as is usually the case, it was the result of
being careless when hurrying. I did a copy-and-paste from code written for
ints when writing an analogous method for doubles, so that there was a line
that read _offDiagPtr = (double*)calloc( (size_t)numberOfElements,
(size_t)sizeof(int)); when it should have read
_offDiagPtr = (double*)calloc( (size_t)numberOfElements,
(size_t)sizeof(double));
I still don't understand the lengthy message that admonishes me to file a bug
report, but I will comply.
Thanks, Seth, for taking a few minutes to reply to my original query.
Boyd
On May 25, 2013, at 10:25 AM, Boyd Collier wrote:
> I've been trying to track down a bug that crashes a document-based cocoa
> application which seems to be caused by referring to an object that no longer
> exists, but thus far haven't succeeded in determining what that object is.
> Yes, I've tried using the Zombies tool in Instruments but to no avail
> (perhaps because of my inexperience using Instruments). The crash occurs
> very inconsistently at the end of scanning a set of data in a completely
> ordinary text file; i.e. sometimes I can scan the same set of data 10 or 15
> times before crashing, sometimes the crash occurs when the data are scanned
> for the first or second time, but (almost?) always it occurs somewhere after
> the data have been scanned (which is indicated by the line from the console
> shown below that reads "the state at end of scanning is 4"). And I'm really
> clueless about what the following lines from the console are telling me; any
> suggestions that you can offer would be greatly appreciated.
>
> I'm using Xcode 4.6 4H127 and OS X 10.7.5.
>
> Boyd
>
>
>
>
> 5/25/13 9:59:21.381 AM SuperSpagedi: looks like there's a distance matrix
> 5/25/13 9:59:21.381 AM SuperSpagedi: the label is pop1
> 5/25/13 9:59:21.382 AM SuperSpagedi: the label is pop2
> 5/25/13 9:59:21.382 AM SuperSpagedi: the label is pop3
> 5/25/13 9:59:21.382 AM SuperSpagedi: the label is pop4
> 5/25/13 9:59:21.382 AM SuperSpagedi: the label is pop5
> 5/25/13 9:59:21.382 AM SuperSpagedi: the label is pop6
> 5/25/13 9:59:21.383 AM SuperSpagedi: the state at end of scanning is 4
> 5/25/13 9:59:35.465 AM com.apple.debugserver-199: 2 +63.911824 sec
> [0322/0303]: error: ::ptrace (request = PT_THUPDATE, pid = 0x0323, tid =
> 0x2007, signal = 0) err = Resource busy (0x00000010)
> 5/25/13 9:59:35.465 AM com.apple.debugserver-199: 3 +0.000197 sec
> [0322/0303]: error: ::task_info ( target_task = 0x1b03, flavor =
> TASK_BASIC_INFO, task_info_out => 0x7fff6a6d5fb0, task_info_outCnt => 10 )
> err = (os/kern) invalid argument (0x00000004)
> 5/25/13 9:59:35.468 AM Xcode: [MT] DVTAssertions: Warning in
> /SourceCache/IDEKit/IDEKit-2109/Framework/Classes/Editor/IDEEditorContext.m:617
> Details: Lost history for
> x-xcode-disassembly://stack_frame?processID=803&threadID=1&frameID=0
> Object: <IDEEditorContext: 0x402d72a40>
> Method: -_greatestDocumentAncestorWasForgotten
> Thread: <NSThread: 0x40010a220>{name = (null), num = 1}
> Please file a bug at http://bugreport.apple.com with this warning message and
> any useful information you can provide.
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