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dustfinger
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PostPosted: Thu Mar 14, 2013 6:00 am    Post subject: linux32 chroot Exec format error [SOLVED] Reply with quote

Hi,
I have a pure 64bit system. I would like to create a 32bit chroot. I do not have any unpartitioned drive space. The following is my file-system listing:
Code:
$ df -lh
Filesystem      Size  Used Avail Use% Mounted on
rootfs          992M  327M  614M  35% /
803             992M  327M  614M  35% /
devtmpfs        3.9G     0  3.9G   0% /dev
tmpfs           3.9G  648K  3.9G   1% /run
shm             3.9G     0  3.9G   0% /dev/shm
cgroup_root      10M     0   10M   0% /sys/fs/cgroup
/dev/sda5        15G  5.7G  9.0G  39% /usr
/dev/sda6       4.9G  162M  4.7G   4% /opt
/dev/sda7        12G  3.4G  8.4G  29% /scratch
/dev/sda8       261G  1.2G  257G   1% /home


/home has the largest amount of free space, so I created the folder /home/dustfinger/mnt/gentoo32. I also created the folder /mnt/gentoo32. I downloaded the latest stage 3 for x86 and then followed the Gentoo guide.
Code:

# cd /home/dustfinger/mnt/gentoo32
# sudo tar -xvjpf /home/dustfinger/Downloads/stage3-i686-20121213.tar.bz2
# sudo cp -L /etc/resolv.conf /mnt/gentoo32/etc/
# sudo cp -L /etc/passwd /mnt/gentoo32/etc/
# sudo linux32 mount --rbind /home/dustfinger/mnt/gentoo32 /mnt/gentoo32
# sudo linux32 mount -o bind /dev /mnt/gentoo32/dev
# sudo linux32 mount -o bind /dev/pts /mnt/gentoo32/pts
# sudo linux32 mount -o bind /dev/shm /mnt/gentoo32/shm
# sudo linux32 mount -o bind /proc /mnt/gentoo32/proc
# sudo linux32 mount -o bind /sys /mnt/gentoo32/sys
# sudo linux32 mount -o bind /usr/portage /mnt/gentoo32/usr/portage
# sudo linux32 mount -o bind /tmp /mnt/gentoo32/tmp
# sudo linux32 chroot /mnt/gentoo32 /bin/bash
chroot: failed to run command '/bin/bash': Exec format error
# file /mnt/gentoo32/bin/bash
/mnt/gentoo32/bin/bash: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.9, stripped
$ file /bin/bash
/bin/bash: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.9, stripped

I did this all while running fvwm in the following environment:
Code:
$ uname -a
Linux galactica 3.7.10-gentoo #1 SMP Mon Mar 4 00:20:16 MST 2013 x86_64 Intel(R) Core(TM) i7 CPU Q 720 @ 1.60GHz GenuineIntel GNU/Linux


##
# EDIT - pasting cflags used in /etc/portage/make.conf incase it is important.
##
Code:

# Configured for Intel Corei7 as x86
# ===========================
CFLAGS="-march=native -O2 -pipe"
CXXFLAGS="${CFLAGS}"
CHOST="i686-pc-linux-gnu"
MAKEOPTS="-j2"


##
# EDIT - pasting output of df-lah
##
Code:
$ df -lah
Filesystem                     Size  Used Avail Use% Mounted on
rootfs                         992M  327M  614M  35% /
803                            992M  327M  614M  35% /
devtmpfs                       3.9G     0  3.9G   0% /dev
proc                              0     0     0    - /proc
tmpfs                          3.9G  648K  3.9G   1% /run
devpts                            0     0     0    - /dev/pts
shm                            3.9G     0  3.9G   0% /dev/shm
sysfs                             0     0     0    - /sys
debugfs                           0     0     0    - /sys/kernel/debug
cgroup_root                     10M     0   10M   0% /sys/fs/cgroup
openrc                            0     0     0    - /sys/fs/cgroup/openrc
cpuset                            0     0     0    - /sys/fs/cgroup/cpuset
cpu                               0     0     0    - /sys/fs/cgroup/cpu
cpuacct                           0     0     0    - /sys/fs/cgroup/cpuacct
freezer                           0     0     0    - /sys/fs/cgroup/freezer
/dev/sda5                       15G  5.7G  9.0G  39% /usr
/dev/sda6                      4.9G  162M  4.7G   4% /opt
/dev/sda7                       12G  3.4G  8.4G  29% /scratch
/dev/sda8                      261G  1.2G  257G   1% /home
binfmt_misc                       0     0     0    - /proc/sys/fs/binfmt_misc
/home/dustfinger/mnt/gentoo32  261G  1.2G  257G   1% /mnt/gentoo32
/dev                           3.9G     0  3.9G   0% /mnt/gentoo32/dev
/dev/pts                          0     0     0    - /mnt/gentoo32/dev/pts
/dev/shm                       3.9G     0  3.9G   0% /mnt/gentoo32/dev/shm
/proc                             0     0     0    - /mnt/gentoo32/proc
/sys                              0     0     0    - /mnt/gentoo32/sys
/usr/portage                    15G  5.7G  9.0G  39% /mnt/gentoo32/usr/portage
/tmp                           992M  327M  614M  35% /mnt/gentoo32/tmp
/dev/sda1                       62M   15M   45M  25% /boot
/boot                           62M   15M   45M  25% /mnt/gentoo32/boot
/proc                             0     0     0    - /mnt/gentoo32/proc

Am I trying to do something that is not possible? Is it trying to run the wrong /bin/bash?

Sincerely,

dustfinger.
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Last edited by dustfinger on Mon Mar 18, 2013 6:55 am; edited 1 time in total
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Hu
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PostPosted: Fri Mar 15, 2013 1:31 am    Post subject: Reply with quote

You do not need to use sudo when you are root. The error you posted typically means your kernel lacks support for running IA32 programs. Enable IA32_EMULATION and try again.
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likewhoa
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PostPosted: Sun Mar 17, 2013 1:40 am    Post subject: Reply with quote

why is your CHOST="i686-pc-linux-gnu" when it should be CHOST="x86_64-pc-linux-gnu"? also you only need 'linux32 chroot ...'
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mv
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PostPosted: Sun Mar 17, 2013 7:30 am    Post subject: Reply with quote

Besides the correct two comments, I would like to add another tiny remark: Instead of using /mnt, it might be more reasonable to use /srv, since I guess you mount it permanently (not temporarily) and thus "serve" an alternative system. Of course, this is more a philosophical consideration, but somebody unfamiliar with your system would perhaps first look under /srv.

Yet another tiny comment: There used to be some scrips/tools - I forgot which one - which explicitly use the directory /newroot (in my opinion a bug, maybe these scripts/tools do not exist anymore). Anyway, I found out that I have less problems if in the top of the chroot directory I have a symlink newroot which points to ".".
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Hu
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PostPosted: Sun Mar 17, 2013 5:21 pm    Post subject: Reply with quote

likewhoa wrote:
why is your CHOST="i686-pc-linux-gnu" when it should be CHOST="x86_64-pc-linux-gnu"? also you only need 'linux32 chroot ...'
That could be correct if he was showing us the version of make.conf present in the chroot. OP: which make.conf did you post: the one from your working amd64 install or the one present in the x86 chroot that you are trying to create?
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dustfinger
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PostPosted: Mon Mar 18, 2013 5:16 am    Post subject: Reply with quote

Firstly, thank you very much to everyone that replied, all of your responses have been appreciated.

Hu,

The make.conf file that I posted was the one from the 32bit chroot that I am trying to setup. The host profile is default/linux/amd64/13.0/no-multilib. I incorrectly assumed that because I was running a no-multilib profile that I couldn't have ia32 emulation. I am going to make the configuration change to my kernel now, and rebuild. It makes sense that I would not be able to kick off a 32 bit environment without it. Thank you very much for pointing that out.

Thank you mv for your suggestion regarding my mount point. To be honest, I had given it little thought, but now that you pointed out a more reasonable mount point I think I will take your advice and move it to /srv. After all, this is not a usb stick I am temporarily mounting.

Sorry that it took me so long to post back to this forum. I am always overworked and anytime I spend on Gentoo is just for fun, so it takes a back seat to my day job unfortunately.

Thanks again for all of your help. I will post back once I am up and running and close the thread.

Sincerely,

dustfinger.
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dustfinger
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PostPosted: Mon Mar 18, 2013 6:16 am    Post subject: Reply with quote

Hi,

Setting IA_32emulation in my kernel did the trick. Thank you very much.

One more quick question:
My x86_64 host make.conf has the CFLAGS set to -march=corei7 -02 -pipe and the MAKEOPTS set to -j5.
1. Does it even make sense to set MAKEOPTS to -j5 for the 32 bit chroot? Should it be -j2 instead?
2. Can I still set the -march=corei7 in the 32 bit chroot, or should I stick with native?


-- EDIT --
I just tried to build something with march = corei7 and I got the error: bad value (corei7) for -march= switch
Switching this back to -march=native -02 -pipe allows me to build packages successfully.
I have MAKEOPTS set to -j5 and don't seem to have any problems.
-----------
Sincerely,

dustfinger.
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Hu
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PostPosted: Tue Mar 19, 2013 1:57 am    Post subject: Reply with quote

You can set MAKEOPTS in the chroot the same as on the main system, since they share memory and CPU time. You would only use a reduced MAKEOPTS if you had artificially reduced the resources available to the 32-bit environment.
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