um: add "noreboot" command line option for PANIC_TIMEOUT=-1 setups
This is an automated ID intended to aid in discovery of potential security vulnerabilities. The actual impact and attack plausibility have not yet been proven. This ID is fixed in Linux Kernel version v5.10.138 by commit 9a6178c225e9037013afa603005b322fda760d8c. For more details please see the references link.