Controls the default state of the null pointer workaround and
whether logging should occur.
When the value is ``0'', the workaround is disabled by default,
and logging is disabled;
when the value is ``1'', the workaround is enabled by default,
and logging is disabled;
when the value if ``2'', the workaround is enabled by default,
and logging is enabled.
When the workaround is enabled,
null pointer reads return zero
instead of faulting with SIGSEGV.
When logging is enabled and the workaround is enabled for a process,
the first time an executable program in that process
reads a null pointer, a message is sent to the console.