Possible EFI memory corruption?

[Phillip Susi]

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I've been trying to help troubleshoot a problem a user has where grub
appears to hang before booting the kernel when he does not have a USB
device plugged in at boot time.  I had him enable debug messages and
the last one is a malloc in script.c after an append once he executes
the boot command, so it doesn't appear to be making it to the linux
boot function and jumping to the kernel.

I'm not sure where to proceed from here, so perhaps someone else could
be of help?  The original bug report is here:

https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1069772

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