CAN stack overflow

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I am trying to implement a CAN communication network between 2 ARM 6 Processors.  The hardware is custom, but matches the MCB 2300 archetecture. 

Each board sends and recieves 1 message on the bus, they are using a recieve ID filter to only recieve the message they want.  The baud rate is 500Kbps and each board sends its message every 10ms.  Each board reads the message with a timeout of 100 ticks.  I keep getting a stack overflow error and increasing the stack size will just take make the error take longer to occur.  Attached are my VI's for each board.

[globalposition]

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