(i'm not sure if this is the right list for this question or not, as
i am developing a cocoa application using IOKit. if this isn't the
right list, could someone please tell me the right list. thanx.)
i'm just starting on developing a core data document base app that
talks to a usb device. sometimes, but not always, i'm getting crashes
when i'm either releasing my IOUSBDeviceInterface300 or my
IOUSBInterfaceInterface300. the error i get on the console is:
malloc: *** error for object 0x102662970: incorrect checksum for
freed object - object was probably modified after being freed.
*** set a breakpoint in malloc_error_break to debug
and i have set that breakpoint. the stack trace at the time is:
#0 0x83d7aa51 in malloc_error_break
#1 0x83d75ad0 in szone_error
#2 0x83cb5571 in tiny_free_list_add_ptr
#3 0x83cb28cf in szone_free
#4 0x025876ba in IOUSBDeviceClass::~IOUSBDeviceClass
#5 0x02586f0d in IOUSBIUnknown::release
#6 0x00001f1a in -[BaseUSBInterface releaseResources] at
BaseUSBInterface.mm:154
in response to:
err = (*(self.interface))->Release( self.interface);
or
err = (*(self.device))->Release( self.device);
where interface and device are declared as follows:
@property ( assign, nonatomic) IOUSBDeviceInterface300**
device;
@property ( assign, nonatomic) IOUSBInterfaceInterface300**
interface;
and synthesized. i am running in 64 bit mode and have NOT declared my
own iVars for these.
these errors don't happen every time and i've yet to be able to
determine a pattern that causes them. i realize that this is some
sort of memory corruption problem, but i'm at a loss as to how to
find it. i do have NSZombieEnabled set to YES and CFZombieLevel set
to 3.
can anyone one offer suggestions as to how to find this problem.
thanx,
ken
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