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Re: Not sure what "Non-aligned pointer being freed" means...
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Re: Not sure what "Non-aligned pointer being freed" means...


  • Subject: Re: Not sure what "Non-aligned pointer being freed" means...
  • From: Chris Suter <email@hidden>
  • Date: Mon, 26 Nov 2007 16:28:31 +1100


On 26/11/2007, at 3:34 PM, Graham Reitz wrote:

I am trying to track down a bug that didn't occur with OS X 10.4.x (Xcode 2.5) but does with the same code in OS X 10.5.1 (Xcode 3.0).

Any help would be greatly appreciated.

Program output: (C++ console app)

mysqlpp_test(2473) malloc: *** error for object 0x18a138: Non- aligned pointer being freed
*** set a breakpoint in malloc_error_break to debug


The app doesn't appear to crash, but when I add more code it does, although I am not sure if this is related. It doesn't look good either way.

It almost looks like it's complaining about memory being deleted that doesn't "belong" to some pointer.

thanks,
graham

All allocations that use the OS X supplied malloc are aligned to 16 bytes. You've clearly tried to free something that isn't so it's invalid.


By the way, the source code for OS X's malloc is available and would have helped you figure out what that error message meant.

- Chris

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 >Not sure what "Non-aligned pointer being freed" means... (From: Graham Reitz <email@hidden>)

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