A couple of ideas (no more than this)
1. A corrupt stack has resulted in a function return address being
corrupted and the program jumps to an illegal instruction.
2. Executing data (shouldn't really happen).
3. Corrupt VMT sgain resulting in the program jumping to an illegal
instruction.
The problem with these type of bugs is that cause and effect can be some
way apart. I tend to debug multi-threaded programs that are mis-behaving
by having lots of writeln statements and then looking at the output log
to see which patterns of behaviour lead to the problem. Can be an art
rather than a science.
On 26/10/16 16:57, Dennis wrote:
I have a multi threaded program which executes a list of tasks in real
time.
It is difficult to debug with a debugger on this program (since
debugging will pause the execution which will be messy for this
application).
So, I log the exceptions to a log file and I found this exception:
EPrivilege Privileged instruction
What could possibly raise this exception?
My program is win 32 from Lazarus 1.7 FPC 3.1.1
and running on Win 7 64 bit.
thanks in advance.
Dennis
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