What does the "aapl,panic-info" output from "nvram -p" mean?
The line panic-info is the details of the last kernel panic registered and stored by the system.  If you do a PRAM (or NVRAM) reset, those details will be removed.

For example, I just ran nvram -p and I had no panic-info line because I did a PRAM reset since my last kernel panic.  I can't even remember the last time I had a kernel panic.

Hope that clears it up for you.