exiting chroot leads to getpt failure

On a Debian Jessie machine I have a rootfs image which I chroot in this way:

mount myimage.img /mnt/myimage
cp /usr/bin/qemu-arm-static /mnt/myimage/usr/bin/
mount --rbind /dev /mnt/myimage/dev
mount -t proc none /mnt/myimage/proc
mount -o bind /sys /myimage/sys
chroot /mnt/myimage

on exiting I do the opposite:

rm /mnt/myimage/usr/bin/qemu-arm-static
umount /mnt/myimage/sys
umount /mnt/myimage/proc
umount /mnt/myimage/dev
umount -l /mnt/myimage

But when I try to open a new terminal in my host machine I get the following error:

Execution of the child process failed

getpt failed: file or directory not exists (translated from Italian)

Perhaps I'm forgetting something?

Mark

Posted 2016-06-07T14:53:08.550

Reputation: 327

I see nothing obviously wrong, though I would use the full path to myimage.img, because the current directory may not set when the command is executed. Are you using ~/.bashrc or ~/.bash_login for the start-up commands? I presume the commands work when you type them manually. – AFH – 2016-06-07T15:36:49.693

You're right about the absolute path, it's a development dir with both scripts sticked there, but it's better to use full path. I use those commands in a /bin/bash script, but the behavior is the same even if I type them manually. – Mark – 2016-06-07T15:39:32.660

If you type them one at a time, which command fails? – AFH – 2016-06-07T15:40:55.583

I don't see any error. But after the last umount I cannot open a new terminal in my Debian machine. I need to reboot, exiting and logging in again it's not enough. – Mark – 2016-06-07T15:45:48.267

Looking in more detail, mount --rbind /dev /mnt/myimage/dev will replace the /dev directory with whatever is in the /dev directory in your image: do you have all the terminal definitions there? – AFH – 2016-06-07T17:54:55.937

I have them (I guess you're talking about the tty* devices). But unmounting /mnt/myimage/dev should not restore the initial state? – Mark – 2016-06-07T18:04:29.627

Yes, it would, but if the shell doesn't start there is nothing to execute the logout commands. Do you have the usual utilities in /bin (including bash) in your myimage.img file system? – AFH – 2016-06-07T22:20:51.717

exiting chroot leads to getpt failure

No answers