[bug #26875] [grub2] grub-mkrescue causes machine to reboot

[Francois-Xavier KOWALSKI]

URL:
  <http://savannah.gnu.org/bugs/?26875>

                 Summary: [grub2] grub-mkrescue causes machine to reboot
                 Project: GNU GRUB
            Submitted by: fixkowalski
            Submitted on: Wed 24 Jun 2009 12:18:20 PM GMT
                Category: Booting
                Severity: Major
                Priority: 5 - Normal
              Item Group: Software Error
                  Status: None
                 Privacy: Public
             Assigned to: None
         Originator Name: Francois-Xavier Kowalski
        Originator Email: address@hidden
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 1.96
         Reproducibility: Every Time
         Planned Release: 

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Details:

Hardware:
- HP Mini 1000
- Boot device: USB key or SD-card

Procedure:

% ./configure && make && make install
[...]
% .grub-mkrescue --image-type=floppy rescue.img
[...]
# dd if=`pwd`/rescue.img of=/dev/mmcblk0 bs=1M
1+1 records in
1+1 records out
1474018 bytes (1.5 MB) copied, 0.179898 s, 8.2 MB/s

Then boot on the SD-card using [F9] key.

The machine starts loads something & reboot (return on BIOS screen).  No
error message is visible.

Troubleshooting:

It seems that this always happens when core.img includes an actual memdisk. 
Whether the memdisk image is generated by "cpio -o" or "tar -cf" does not
change this.

Booting without an included memdisk image (without the -m parameter of
grub-mkimage) but with the memdisk, loopback & cpio modules works: It allows
to manually examine the memdisk image file content, which is Ok.




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