Comments on: malloc: *** Deallocation of a pointer not malloced: 0×500120; This could be a double free(), or free() called with the middle of an allocated block; Try setting environment variable MallocHelp to see tools to help debug http://www.boyfarrell.com/learning-curve/malloc-deallocation-of-a-pointer-not-malloced-0x500120-this-could-be-a-double-free-or-free-called-with-the-middle-of-an-allocated-block-try-setting-environment-variable-mallochelp-to-see-tools-to-help Just another WordPress weblog Fri, 07 May 2010 16:09:36 +0000 hourly 1 http://wordpress.org/?v=3.0 By: Chinmoy http://www.boyfarrell.com/learning-curve/malloc-deallocation-of-a-pointer-not-malloced-0x500120-this-could-be-a-double-free-or-free-called-with-the-middle-of-an-allocated-block-try-setting-environment-variable-mallochelp-to-see-tools-to-help/comment-page-1#comment-100 Chinmoy Wed, 30 May 2007 14:16:48 +0000 http://www.boyfarrell.com/learning-curve/malloc-deallocation-of-a-pointer-not-malloced-0x500120-this-could-be-a-double-free-or-free-called-with-the-middle-of-an-allocated-block-try-setting-environment-variable-mallochelp-to-see-tools-to-help#comment-100 Actually, I can't take credit for setting the pointer to nil, because I read that in Aaron Hillegass's book, Cocoa Programming for Mac OS X :) Chinmoy. Actually, I can’t take credit for setting the pointer to nil, because I read that in Aaron Hillegass’s book, Cocoa Programming for Mac OS X :)

Chinmoy.

]]> By: boyfarrell http://www.boyfarrell.com/learning-curve/malloc-deallocation-of-a-pointer-not-malloced-0x500120-this-could-be-a-double-free-or-free-called-with-the-middle-of-an-allocated-block-try-setting-environment-variable-mallochelp-to-see-tools-to-help/comment-page-1#comment-99 boyfarrell Sat, 26 May 2007 20:43:58 +0000 http://www.boyfarrell.com/learning-curve/malloc-deallocation-of-a-pointer-not-malloced-0x500120-this-could-be-a-double-free-or-free-called-with-the-middle-of-an-allocated-block-try-setting-environment-variable-mallochelp-to-see-tools-to-help#comment-99 Hi, It never occurred to me to set the method to nil. That could be a good problem solving method. Cheers for the link. Dan. Hi,

It never occurred to me to set the method to nil. That could be a good problem solving method. Cheers for the link.

Dan.

]]> By: Chinmoy http://www.boyfarrell.com/learning-curve/malloc-deallocation-of-a-pointer-not-malloced-0x500120-this-could-be-a-double-free-or-free-called-with-the-middle-of-an-allocated-block-try-setting-environment-variable-mallochelp-to-see-tools-to-help/comment-page-1#comment-98 Chinmoy Fri, 25 May 2007 22:11:35 +0000 http://www.boyfarrell.com/learning-curve/malloc-deallocation-of-a-pointer-not-malloced-0x500120-this-could-be-a-double-free-or-free-called-with-the-middle-of-an-allocated-block-try-setting-environment-variable-mallochelp-to-see-tools-to-help#comment-98 Hi Daniel, You could use MallocDebug (see http://developer.apple.com/tools/performance/overview.html#mallocdebug) to find memory allocation related problems. MallocDebug is a standalone app that comes with the CHUD(Computer Hardware Understanding Development Tools) that you can download from Apple's Developer Connection. You could also add this trick after a call to release: [object release]; //this is your first release object = nil; [object release]; //same as [nil release]; //nothing happens. //actually <i>something</i> might happen, but //not another release. Hi Daniel,

You could use MallocDebug (see http://developer.apple.com/tools/performance/overview.html#mallocdebug) to find memory allocation related problems. MallocDebug is a standalone app that comes with the CHUD(Computer Hardware Understanding Development Tools) that you can download from Apple’s Developer Connection.

You could also add this trick after a call to release:

[object release]; //this is your first release
object = nil;

[object release]; //same as [nil release];
//nothing happens.
//actually something might happen, but
//not another release.

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