bugGNU GRUB - Bugs: bug #59286, Grub 2.04 loopback command hangs...


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bug #59286: Grub 2.04 loopback command hangs in UEFI systems

Submitted by:  Hedayat Vatankhah <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: 
Open/Closed:  Open Release: 
Release:  other Reproducibility:  Every Time
Planned Release:  None

Sat 17 Oct 2020 01:16:49 PM UTC, original submission:  

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

Hedayat Vatankhah <hedayat>


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