GRUB2 errors

Message

tranquilcool · Post by **tranquilcool** » Mon May 24, 2010 2:46 am

anybody experienced this error with grub2?

out of range pointer 0x7fea0
errors: no partitions on this disk.

i have tried the solutions proposed in the ubuntu forum but still can't boot
with grub2.

d2_racing · Post by **d2_racing** » Mon May 24, 2010 3:05 am

Hi, can you tell me how did you install your grub 2 ?

Also, can you post this :

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# fdisk -l
# cat /etc/fstab
# cat /boot/grub/grub.cfg

tranquilcool · Post by **tranquilcool** » Mon May 24, 2010 3:11 am

d2_racing wrote:Hi, can you tell me how did you install your grub 2 ?

Also, can you post this :
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# fdisk -l
# cat /etc/fstab
# cat /boot/grub/grub.cfg

grub-mkconfig -o /boot/grub/grub.cfg
grub-install /dev/sda

Device Boot Start End Blocks Id System
/dev/sda1 * 1 15 120456 83 Linux
/dev/sda2 16 139 996030 82 Linux swap / Solaris
/dev/sda3 140 58934 472270837+ 83 Linux
/dev/sda4 58935 60801 14996677+ 83 Linux

/dev/sda1 /boot ext4 noauto,noatime 1 2
/dev/sda3 / ext4 noatime 0 1
/dev/sda2 none swap sw 0 0
/dev/sda4 /usr/portage ext4 noatime,barrier=0,data=writeback,nobh,commit=100 0 2
/dev/cdrom /mnt/cdrom auto noauto,users 0 0
shm /dev/shm tmpfs nodev,nosuid,noexec 0 0

### BEGIN /etc/grub.d/10_linux ###
menuentry 'Gentoo GNU/Linux, with Linux 2.6.34-zen0' --class gentoo --class gnu-linux --class gnu --class os {
insmod ext2
set root='(hd0,1)'
search --no-floppy --fs-uuid --set 4b134d55-02ed-475f-9a2b-6ccc928ed37f
echo 'Loading Linux 2.6.34-zen0 ...'
linux /kernel-2.6.34-zen0 root=/dev/sda3 ro
}
menuentry 'Gentoo GNU/Linux, with Linux 2.6.34-rc5-nou' --class gentoo --class gnu-linux --class gnu --class os {
insmod ext2
set root='(hd0,1)'
search --no-floppy --fs-uuid --set 4b134d55-02ed-475f-9a2b-6ccc928ed37f
echo 'Loading Linux 2.6.34-rc5-nou ...'
linux /kernel-2.6.34-rc5-nou root=/dev/sda3 ro
}
menuentry 'Gentoo GNU/Linux, with Linux 2.6.34-intel' --class gentoo --class gnu-linux --class gnu --class os {
insmod ext2
set root='(hd0,1)'
search --no-floppy --fs-uuid --set 4b134d55-02ed-475f-9a2b-6ccc928ed37f
echo 'Loading Linux 2.6.34-intel ...'
linux /kernel-2.6.34-intel root=/dev/sda3 ro
}
menuentry 'Gentoo GNU/Linux, with Linux 2.6.34-ck1' --class gentoo --class gnu-linux --class gnu --class os {
insmod ext2
set root='(hd0,1)'
search --no-floppy --fs-uuid --set 4b134d55-02ed-475f-9a2b-6ccc928ed37f
echo 'Loading Linux 2.6.34-ck1 ...'
linux /kernel-2.6.34-ck1 root=/dev/sda3 ro
}
GRUB_TERMINAL=console (proposed in the ubuntu forum as a solution but doesn't work for me)

etc etc.
used to work until the last few updates.
grub-9999.

d2_racing · Post by **d2_racing** » Mon May 24, 2010 3:19 am

Hi, I'm not an expert, but are you sure :

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/dev/sda1 /boot ext4 noauto,noatime 1 2

Maybe you need to have this :

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insmod ext4

tranquilcool · Post by **tranquilcool** » Mon May 24, 2010 3:21 am

d2_racing wrote:Hi, I'm not an expert, but are you sure :
Code: Select all
/dev/sda1 /boot ext4 noauto,noatime 1 2 
Maybe you need to have this :
Code: Select all
insmod ext4

honestly i don't think that should be a problem.
ext2 ext3 and ext4 are exchangeable to my knowledge though i confess am
no expert too.

Mousee · Post by **Mousee** » Mon May 24, 2010 4:54 am

I don't use Grub2.x but, unless something drastically changed since I last played around with it...

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set root='(hd0,1)'

This is wrong. It should be

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set root='(hd0,0)'

The "root" it's referring to in this case is actually the drive location you have grub installed to which, naturally, is your /boot partition (/dev/sda1 or hd0,0).

tranquilcool · Post by **tranquilcool** » Mon May 24, 2010 8:40 am

Mousee wrote:I don't use Grub2.x but, unless something drastically changed since I last played around with it...
Code: Select all
set root='(hd0,1)' 
This is wrong. It should be
Code: Select all
set root='(hd0,0)' 
The "root" it's referring to in this case is actually the drive location you have grub installed to which, naturally, is your /boot partition (/dev/sda1 or hd0,0).

you are talking about grub-legacy. the grub2 scheme is different.
set root='(hd0,1)' is the correct numbering in grub2

d2_racing · Post by **d2_racing** » Mon May 24, 2010 5:07 pm

Indeed, Grub2 start at 1 with the partition, not 0

Fran · Post by **Fran** » Thu Dec 02, 2010 11:56 am

I'm seeing this now

. I swapped my old HD by a new SSD and I'm getting the same 0x7fea0 error.

js08 · Post by **js08** » Fri Dec 31, 2010 2:59 pm

I've been using grub-1.97.2-r2 (sabayon-overlay) for more than a half year now and it worked fine, survived several system/world rebuilds up to yesterday on my laptop (AMD64, /boot belongs to / and is ext4). Yesterday I did a world rebuild after switching to gcc-4.5.2 and now the system is no longer bootable....

It starts with:

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GRUB loading...
Welcome to GRUB!

Entering rescue mode...
out of range pointer 0x7fe80

My first thought was that something went wrong with the installation of grub2 - but rebuilding, installing, etc of grub shows no errors on laptop (after starting it with rescue dvds and chrooting into it). Unfortunately I have already deleted gcc-4.5.1 ...

perhaps someone out there can give me a hint - whether there are compiler problems with grub2 or something else...

js08 · Post by **js08** » Fri Dec 31, 2010 7:43 pm

as assumed it's the compiler which is buggy or trigger this bug (Portage 2.1.9.26 (default/linux/amd64/10.0/no-multilib, gcc-4.5.2, glibc-2.12.1-r3, 2.6.37-rc5 x86_64))

gcc-4.5.2 -> sys-boot/grub-1.97.2-r2 -> out of range pointer 0x7fe80
gcc-4.5.2 -> sys-boot/grub-1.98-r8 -> same out of range pointer 0x7fe80

after re-installing an older compiler version (sys-devel/gcc-4.4.4-r2)

gcc-4.4.4 -> sys-boot/grub-1.97.2-r2 -> works like a charm again
gcc-4.4.4 -> sys-boot/grub-1.98-r8 -> boots too but has gfxterm problems with my laptop)

perhaps the other out-of-range-pointer problems are also compiler (+/- optimization) issues.

schrdlu · Post by **schrdlu** » Sat Jan 01, 2011 2:21 pm

js08 wrote:as assumed it's the compiler which is buggy or trigger this bug (Portage 2.1.9.26 (default/linux/amd64/10.0/no-multilib, gcc-4.5.2, glibc-2.12.1-r3, 2.6.37-rc5 x86_64))

gcc-4.5.2 -> sys-boot/grub-1.97.2-r2 -> out of range pointer 0x7fe80
gcc-4.5.2 -> sys-boot/grub-1.98-r8 -> same out of range pointer 0x7fe80

after re-installing an older compiler version (sys-devel/gcc-4.4.4-r2)

gcc-4.4.4 -> sys-boot/grub-1.97.2-r2 -> works like a charm again
gcc-4.4.4 -> sys-boot/grub-1.98-r8 -> boots too but has gfxterm problems with my laptop)

perhaps the other out-of-range-pointer problems are also compiler (+/- optimization) issues.

HMMMMMM, maybe it's not just me then,portage 2.1.9.26,gcc-4.5.1,glibc-2.12.1-r3 grub-0.97-r10,are,similar items in my rebuild,had a hdd failure,and could only get a 500G ide replacement,after around 10 or so failed boots/rebuilds,thought I would try and use the original sata 160G drive,which at this time is in process of emerge -e system. So not holding breath to see if I get a boot,using the 201012 mini install cd and portage. Not too sure if my mirror will have the earlier files needed to create a system,, anyone have any idea as to redundancy of files in the respective mirrors??????.
My system AMD64 2300 nvidia mobo ,which I cant locate an upgrade for the bios,as I thought that might have been the problem,but the 500G is recognised in the bios ok. It's now 00:50 so think I will shut down/mask the gcc and try again tomorrow.

Well no luck there rebuilt the bootstrap/& system with the gcc-4.4.4-r2 ,changed my keywords from '~amd64 to amd64' and apart from downloading a lot more files the result is the same loading stage -1.5 error 15, can someone point me to a cure for this, I'm still perusing the forums...... Also I think this might be 64 bit problem as this hdd was originally in a 32 bit machine with all the latest updates & portage,and all worked ok in that machine,apart from the fact I wasn't able to access the whole hdd.

apurkrt · Post by **apurkrt** » Sat Feb 26, 2011 2:37 pm

js08 wrote:as assumed it's the compiler which is buggy or trigger this bug

I can confirm this, run into the same problem with gcc 4.5.2, switching back to 4.4.4 (through gcc-config), recompiling & reinstalling grub solved the problem

gcc-4.5.2 + sys-boot/grub-1.98 -> out of range pointer ...
gcc-4.4.4 + sys-boot/grub-1.98 -> works fine

hirakendu · Post by **hirakendu** » Mon Feb 28, 2011 5:02 am

Also see the bug 318215 at b.g.o. The conclusion is that grub-1.98 is sort of obsolete and broken with gcc-4.5, and grub-1.99 is on its way. Meanwhile, need to use grub-9999 (the bzr ebuild) with the debug options disabled in the ebuild. (Apparently grub-1.99 should also work with debug enabled but I didn't have time to test it myself.) I have up a tested and working revised ebuild here.

Update: I just verified that the 9999 ebuild in portage also works.

Kollin · Post by **Kollin** » Mon Feb 28, 2011 7:46 am

Why on earth you are updating grub guys?

The darn thing never behaves in a predictable way!

As soon as you make it boot your system, you should do "emerge -C grub".
After that only the configuration file needs editing if you change kernel or something!

apurkrt · Post by **apurkrt** » Mon Feb 28, 2011 12:10 pm

Kollin wrote:Why on earth you are updating grub guys? The darn thing never behaves in a predictable way!
As soon as you make it boot your system, you should do "emerge -C grub".
After that only the configuration file needs editing if you change kernel or something!

Why update? Why not, maybe one just wants to try grub2?

Actually, I wasn't updating, I just installed gentoo, updated it (emerge -uDN world in chroot), switched to new (4.5) gcc, then booted into it manually through grub2 on flashdisk and just wanted to install grub2... and I've run into the "out of range pointer" bug.

Regarding 'emerge -C grub', I don't think it's a good idea, it would remove the grub-mkconfig script, which is the standard way to create/update /boot/grub/grub.cfg in grub2 (/boot/grub/menu.lst is gone in grub2 + the /boot/grub/grub.cfg is not supposed to be edited directly)

Kollin · Post by **Kollin** » Mon Feb 28, 2011 12:14 pm

renergy wrote:
Kollin wrote:Why on earth you are updating grub guys? The darn thing never behaves in a predictable way!
As soon as you make it boot your system, you should do "emerge -C grub".
After that only the configuration file needs editing if you change kernel or something!
Why update? Why not, maybe one just wants to try grub2?

Actually, I wasn't updating, I just installed gentoo, updated it (emerge -uDN world in chroot), switched to new (4.5) gcc, then booted into it manually through grub2 on flashdisk and just wanted to install grub2... and I've run into the "out of range pointer" bug.

Regarding 'emerge -C grub', I don't think it's a good idea, it would remove the grub-mkconfig script, which is the standard way to create/update /boot/grub/grub.cfg in grub2 (/boot/grub/menu.lst is gone in grub2 + the /boot/grub/grub.cfg is not supposed to be edited directly)

C'moon i'm editin manualy grub.cfg from years... no problems so far

P.S. Still using grub-1.96, changed rootfs 3 times and the kernel countless times

hirakendu · Post by **hirakendu** » Mon Feb 28, 2011 2:04 pm

@ Kollin, renergy:

I too edit grub.cfg directly. I find it ridiculous to use scripts for editing such a simple config file. (Not to mention, Ubuntu and co's grub2 management is hilarious and obscures something so intuitive, all probably in the name of ease and scripting.) Regardless, you might find my grub.cfg (and grub-submenu.cfg) useful, which contains example entries for many OS'es, including Mac OS X.

The only command from grub which I use is grub-install, which is rare too. While one could manage with just the grub files in boot, I wouldn't recommend emerge -C grub. Besides grub is fairly reliable these days and doesn't break much during updates.

Kollin · Post by **Kollin** » Mon Feb 28, 2011 3:50 pm

hirakendu wrote: Regardless, you might find my grub.cfg (and grub-submenu.cfg) useful, which contains example entries for many OS'es, including Mac OS X.

.cfg files saved!

Thank you!

apurkrt · Post by **apurkrt** » Mon Feb 28, 2011 5:14 pm

hirakendu wrote:Regardless, you might find my grub.cfg (and grub-submenu.cfg) useful, which contains example entries for many OS'es, including Mac OS X.

Nice summary in the files!

hirakendu · Post by **hirakendu** » Mon Feb 28, 2011 5:50 pm

@ Kollin and renergy:

Thank you, and yes, I forgot to mention that it includes some notes in between and towards the end about grub2 management, including making live iso dvds, usb disks and such. (For booting osx, one needs to have the --enable-efiemu in the ebuild, as in here. Also see a grub background and font in here. Lots of other small details here and there.)

apurkrt · Post by **apurkrt** » Fri Mar 04, 2011 10:28 pm

Update: grub 1.99_rc1 works fine with gcc 4.5.2

no more 'out of range pointer' bug..