I attempted to upgrade from High Sierra to Mojave and in the process it somehow corrupted my system. It did not complete upgrade, and now it will only boot into High Sierra for a few minutes before it crashes into a panic boot. It diables a couple of 3rd party kernels and it continues in an endless loop of reboots.
Command R will restart your computer in the Recovery Partition. From here you can run Disk Utility and select Disk First Aid. If you have already done this and Disk Utility reported a error that couldn't be fixed, your next option is to erase the hard drive. Here's an Apple help document on erasing the drive: How to erase a disk for Mac - Apple Support Once that is complete you have two options: if you have a TimeMachine backup you can select Restore from TimeMachine. If not, select the Reinstall Mac OS option.
Command R will restart your computer in the Recovery Partition. From here you can run Disk Utility and select Disk First Aid. If you have already done this and Disk Utility reported a error that couldn't be fixed, your next option is to erase the hard drive. Here's an Apple help document on erasing the drive: How to erase a disk for Mac - Apple Support Once that is complete you have two options: if you have a TimeMachine backup you can select Restore from TimeMachine. If not, select the Reinstall Mac OS option.
In the recovery partition (see the other posts) I would first do "Install OS", that will install the OS that is in your mac, probably Mojave but maybe HighSierra: it will install this over (completely) the OS in your mac, without destroying any of your user data.
Erasing your disk is the last, when nothing else works, because everything on the disk is erased leaving nothing.
Did you Boot into Recovery (Command R) and from the dropdown menu: Utilities>  Disk Utility> run the First Aid on your Macintosh HD. If errors are found and repaired, run again until no errors reported.

Recovery http://support.apple.com/kb/HT4718
You can reinstall the macOS from this environment if necessary. Quit the DU and reinstall the macOS.
I tried the disk repair. It failed due to a Omap error.
I am not sure exactly how to get another OS image in order to install
Corrupt file system on MacBook pro
