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chroot with bash: illegal instruction
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svoop
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Joined: 11 Jan 2009
Posts: 39

PostPosted: Mon Nov 05, 2012 7:59 pm    Post subject: chroot with bash: illegal instruction Reply with quote

Hi

(I've posted this in "Installing Gentoo", but here's probably a better place to ask.)

I've installed Gentoo on a i7-2600 (sandy bridge) as Xen dom0, no problem at all. Now I try to install a Gentoo domU.

After having downloaded and unpacked stage3 and portage to the domU partition /mnt/dom1-tango, now I'm stuck here:

Code:
mount -t proc none /mnt/dom1-tango/proc
mount -o bind /dev /mnt/dom1-tango/dev
chroot /mnt/dom1-tango /bin/bash
Illegal instruction


I don't know whether chroot or bash causes the error. However, I can use both of them individually without any problem. The following work just fine:

Code:
/mnt/dom1-tango/bin/bash
/usr/bin/chroot /bin/ls


The problem persists if I replace /mnt/dev-tango/bin/bash with /bin/bash.

The dom0 binaries were compiled with the following settings in make.conf (I'm on GCC 4.5.4 p1.0):

Code:
CHOST="x86_64-pc-linux-gnu"
CFLAGS="-march=core2 -msse4.1 -msse4.2 -mtune=generic -O2 -pipe"
CXXFLAGS="${CFLAGS}"
MAKEOPTS="-j3"


(I've also tried without "-msse4.1 -msse4.2", same result. And the precompiled binary from stage3 fails as well.)

Here's the cpuinfo:

Code:
processor   : 7
vendor_id   : GenuineIntel
cpu family   : 6
model      : 42
model name   : Intel(R) Core(TM) i7-2600 CPU @ 3.40GHz
stepping   : 7
microcode   : 0x1a


I'm running out of options here, any idea what's wrong here?

Thanks a bunch for your help!
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eccerr0r
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Joined: 01 Jul 2004
Posts: 3951
Location: USA

PostPosted: Mon Nov 05, 2012 8:30 pm    Post subject: Reply with quote

How were the libraries in the chroot built? Bash in the chroot will use the library in the chroot.

There are a lot of libraries in play here, should start with glibc, then readline and termcap... and there's more...
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svoop
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Joined: 11 Jan 2009
Posts: 39

PostPosted: Tue Nov 06, 2012 7:47 am    Post subject: Reply with quote

eccerr0r wrote:
How were the libraries in the chroot built?


They are precompiled from stage3:
ftp://mirror.switch.ch/mirror/gentoo/releases/amd64/current-stage3/stage3-amd64-20121013.tar.bz2

In fact, I've used the same stage3 to install the dom0 without any problem.
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