Docker: bash: /dev/null: Permission denied

I use docker to unpack a linux chroot and then execute commands into it, but I get this inside the chroot. echo ciao > /dev/null bash: /dev/null: Permission denied I thought that the null device must be corrupted so I tried something else: rm -f /dev/null ; mknod -m 0666 /dev/null c 1 3; echo ciao > /dev/null bash: /dev/null: Permission denied But it also did not work. Doing stat on the main /dev/null and the one inside the chroot showed no difference at all. I am writing this because it seems I was the first person in the writing about this problem.