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[bug #42948] Listing (cd,apple4)/ hangs GRUB 2

From: adrian15
Subject: [bug #42948] Listing (cd,apple4)/ hangs GRUB 2
Date: Fri, 08 Aug 2014 16:59:57 +0000
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:30.0) Gecko/20100101 Firefox/30.0 Iceweasel/30.0a2


                 Summary: Listing (cd,apple4)/ hangs GRUB 2
                 Project: GNU GRUB
            Submitted by: adrian15sgd
            Submitted on: vie 08 ago 2014 16:59:55 GMT
                Category: Disk &amp; Partition
                Severity: Major
                Priority: 5 - Normal
              Item Group: Software Error
                  Status: None
                 Privacy: Public
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: other
         Reproducibility: Every Time
         Planned Release: None



== Build system ==

* Debian Unstable from 08 August 2014

== Build options ==

./configure --with-platform=efi at first pass.
./configure --with-platform=pc at second pass.

== How do I build and prepare my system ==
=== Make sure no Debian grub package is found in chroot ===
apt-get remove '.*grub.*'
=== Grub2 (efi+pc)) Build and installation ===
# Make sure we are testing the right revision
mkdir grub_upstream
cd grub_upstream
git clone git://git.savannah.gnu.org/grub.git .
git checkout COMMIT-TO-TEST

# Remove any non git related file - BEGIN
git reset --hard
git clean -f -d
git clean -f -x -d
# Remove any non git related file - END
# Build efi based grub and install it - BEGIN
./autogen.sh && ./configure --with-platform=efi && make
# Dont forget to delete any rest of previous installation - BEGIN
sudo rm -rf /usr/local/etc/grub.d/ /usr/local/bin/grub-*
# Dont forget to delete any rest of previous installation - END
sudo make install
# Build efi based grub and install it - END
make clean # Prepare for next build
./configure --with-platform=pc && make # Prepare for a i386 build
sudo make install # Install i386 build

=== Super Grub2 Disk build ===
./supergrub-mkrescue -o="whatever-name.iso"
You can find supergrub-mkrescue source code here:
Anyways what it is running is:
grub-mkrescue --output=super_grub2_disk_hybrid_2.00s2.iso /tmp/tmp.As2v1yM9lK
where /tmp/tmp.As2v1yM9lK is a temporary directory with all the extra Super
Grub2 Disk files.

Probably running:

grub-mkrescue --output=test.iso /tmp/emptydir/

which needs to output both these messages:
Enabling BIOS support ...
Enabling x86_64-efi support ...

should arise the same results.

== VM system ==

Virtualbox 4.3.10 r93012
Enable EFI option is unchecked!
Cdrom drive: super_grub2_disk_2.00s2.iso
Disk 1: Windows 7
Disk 2: Rescatux USB
Disk 3: SteamOS disk
Disk 4: efi test

== How to reproduce the bug ==
If needed press 'c' to go to grub shell.
echo (*)
# This command is not needed but you will see that: (cd,apple4) is there as a
ls (cd,apple4)/

So if the bug happens GRUB hangs. You see all the previous text on the screen
but it no longer returns to grub shell prompt (grub>)! It's like if you
pressed the Pause button in a video.
If the bug does not happen then you see another error that gives you back to
prompt (grub>). E.g.: error: unknown filesystem

== Bug bisection ==

After a very long git bisection I have some suspect commits:

There are only 'skip'ped commits left to test.
The first bad commit could be any of:

I had to skip some of these commits because I found non bug related errors
such as:

commands/i386/coreboot/cbls.c: In function 'iterate_linuxbios_table':
commands/i386/coreboot/cbls.c:91:8: error: format '%llx' expects argument of
type 'long long unsigned int', but argument 6 has type 'grub_uint64_t'
        fb->blue_field_pos, fb->reserved_field_pos);

== Extra details about build ==

When trying to build Grub 2.00 versions from Debian Unstable I have had to
workaround some build problems but for the commits mentioned in bisection I
think the only needed workaround is to edit:util/grub-mkfont.c file and

#include <freetype/ftsynth.h>


#include <ftsynth.h>

== Why this bug is important ==

Super Grub2 Disk algorithms loop every device found at (*). When checking what
files are in (cd,apple4)/ in the selfwriting menuentries process it hangs !!!

== Summary ==

* You need to make sure that efi platform modules are found in the system
before grub-mkrescue is run.
* No sure if pc platform is needed but I do my tests with it.
* VM does not need its EFI support to be turned on.
* In previous commits running "ls (cd,apple4)/" did not hang grub2 but now it
* Please check the commits at "Bug bisection" section these are the first ones
that either:
** Don't build because of GCC enforcements on integer castings
** Introduce the bug


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