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Debug assertion failed

P: 1

I have an application which creates a queue, a thread is putting data in the queue using malloc and another thread is getting data from the queue and delete the memory allocated in the first thread.
When free() is called to delete the allocated memory, it crashes with:

Debug assertion failed
dbgheap.c line 1044

expression _CrtIsValidHeapPointer(pUserData)

It looks like the second thread can not free the memory allocated in the first thread. Is there any easy way to fix the problem?


Aug 27 '07 #1
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2 Replies

Expert 100+
P: 463
Threads use the same global space so I don't see any reason why the heap resource can't be released by another thread.

Have you made sure that there isn't some bug happening here? Is the address being corrupted? Do you release the resource more than once? Are you mixing malloc/new with free/delete?

Sometimes a second opinion is really helpful. Valgrind is one of the best memory checkers for linux boxes.
Aug 27 '07 #2

Expert Mod 5K+
P: 9,197
This is clearly a memory corruption bug caused by these threads manipulating the same memory.

Are the threads operating on the memory while in a critical section?? If not, there's your answer.
Aug 28 '07 #3

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