Hi there, On some systems, ExitBootServices() will fail due to a change in the memory map during execution of the boot services call. The UEFI spec says that in that event, GetMemoryMap() should be repeated, then the new key passed to another call to ExitBootServices(). Note that the spec doesn't give an upper bound on the number of times to do this dance. The logic in grub_efi_finish_boot_services() just tries once, leading to a failure to properly shut down boot services and various issue booting UEFI-compliant operating systems.
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