Can *x86 systems* permit nested exceptions?

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Yes, x86 systems can permit nested exceptions. When an exception occurs during the handling of another exception, the CPU can suspend the handling of the first exception, save its context, and then start handling the second exception. Once the second exception is resolved, the CPU can resume handling the first exception from where it left off. This process continues until all nested exceptions are resolved, or until the system determines that the exceptions cannot be resolved and generates a system error.