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panic function were performed after the system was corrupt and
during an attempt to save data. Normally, any events that occur after
the initial call to the panic function will not help you determine why
the system crashed.
In this example, the problem is in the pgrp_ref function on line 561
in the kern_proc.c file.
If you follow the stack trace after the pgrp_ref function, you can see
that the pgrp_ref function calls the simple_lock_valid_violation
function. This function displays information about simple locks, which
might be helpful in determining why the system crashed.
7 Retrieve the information from the simple_lock_valid_violation
function by displaying the preserved message buffer.
4–12 Crash Analysis Examples