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Re: cyg_thread_delay on ARM7 crashes randomly


On Mon, May 01, 2006 at 01:52:26PM -0400, Brett Delmage wrote:
> I have a simple test program, a simplification of the TwoThreads program. 
> All it does is initialize and resume one thread. The single thread calls 
> cyg_thread_delay(1) in a loop.
> 
> The target is a minor variation of the Philips LPC 2106, running on a 
> Philips LPC2114 ARM7. Compiler is GCC 3.4.2
> 
> The program crashes after a random period of time, ranging from almost 
> immediately to maybe tens of seconds. But when I enable tracing, dumping 
> trace messages to serial port 0 at 9600 baud, the program has run for over 
> half an hour without crashing.
> 
> There is no other I/O or source of interrupts occuring other than the real 
> time clock, that I am aware of.
> 
> When the program crashes, my JTAG debugger shows the 
> PC at ffff ffd7, and all other registers = ffff ffff
> 
> Putting breakpoints on all the vectors except IRQ doesn't trigger when the 
> crash occurs. A breakpoint at the IRQ does trigger, indicating the clock 
> interrurpt is occurring, and also triggering the debugger breakpoint.
> 
> This looks like an interrupt occurring when it shouldn't but who knows.
> 
> I'm have no idea why my debugger (Ashling PFARM and Opella) stops when the 
> program crashes.
> 
> All ideas, including debugging suggestions very much welcomed.

Do you have CYGPKG_INFRA_DEBUG enabled? Enabling it might give some
interesting results.

            Andrew

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