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Task getting blocked on UNKNOWN

Other Parts Discussed in Thread: MSP430F6632, SYSBIOS

Hi, 

I am using MSP430F6632 on code composer studio v5.2.1.0008 and sysbios 6.33.6.50. Recently i have included binary semaphore to stop certain code from running like .

Task 1

if( Semaphore_pend(DataBus,BIOS_WAIT_FOREVER))

{

//code

Semaphore_post(DataBus);

}

Task 2 

{

if( Semaphore_pend(DataBus,BIOS_WAIT_FOREVER))

{

//code

Semaphore_post(DataBus);

}

}

but once in while when we run TASK 1 , either task1 or task 2 get blocked to unkown. what could be possible cause of this.Please see the attached image.

Regards,

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