data abort error

What kind of error could it be, if one register gets a address value causing a data abort. Because this value is in the undefinend area.

I wrote the code in c and I set a breakpoint befor the part, where the data abort occur. But when I step through this part of code I get the right value for this register and no data abort will occur.

So I think the code must be ok, but which side-effect could cause such a error?


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