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[bug #59286] Grub 2.04 loopback command hangs in UEFI systems

From: Hedayat Vatankhah
Subject: [bug #59286] Grub 2.04 loopback command hangs in UEFI systems
Date: Sat, 17 Oct 2020 09:16:52 -0400 (EDT)
User-agent: Mozilla/5.0 (X11; Fedora; Linux x86_64; rv:82.0) Gecko/20100101 Firefox/82.0


                 Summary: Grub 2.04 loopback command hangs in UEFI systems
                 Project: GNU GRUB
            Submitted by: hedayat
            Submitted on: Sat 17 Oct 2020 01:16:49 PM UTC
                Category: Booting
                Severity: Major
                Priority: 5 - Normal
              Item Group: Software Error
                  Status: None
                 Privacy: Public
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
                 Release: other
         Discussion Lock: Any
         Reproducibility: Every Time
         Planned Release: None



With Grub 2.04 on UEFI systems, running the following command in grub hangs:
loopback loop /isodir/distro_iso_file.iso

As already being noted in Debian/Ubuntu bug reports [1][2], unloading tpm
module fixes the problem. They guess that grub is trying to verify the whole
ISO. I'm also seeing this problem in Fedora, and the 'rmmod tpm' workaround
works for me too.

[1] https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1851311
[2] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=959425


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