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What to do when new kernel does not work
Ocassionally things go bad(tm). This has bit me for the second time in approx 3 years now, but generally one needs to load the old FreeBSD kernel to start debugging and going through a box with a fine toothcomb.
The following snipbit gives you an idea what steps to take when rebooting the server so that you can load the previous working copy of the FreeBSD kernel:
When the boot menu appears hit the spacebar to stop the countdown.
Press "6" for "to escape to loader prompt"
Now the old working FreeBSD kerenl is booting up. It would be recommended to copy the last working version to /boot/kernel.last for example so that you can "load /boot/kernel.last/kernel", especially if you are going to be building your kernel multiple times on a server.
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