Bug#984768: schroot: fails chrooting in qemu-debootstrap rootfs

[Carlos Sanmartín <carsanbu+debian@gmail.com>]

Package: schroot
Version: 1.6.10-11+b1
Severity: normal
X-Debbugs-Cc: carsanbu+debian@gmail.com

Dear Maintainer,

I've found this problem when I upgraded Debian, previously it
worked correctly in my system.

These are the steps to reproduce:

qemu-debootstrap --arch=armhf bullseye bullseye-armhf http://ftp.debian.org/debian/

echo "[bullseye-armhf]
description=Debian Bullseye
directory=$(pwd)/bullseye-armhf
users=$(whoami)
type=directory" | tee /etc/schroot/chroot.d/bullseye-armhf

schroot -c bullseye-armhf

The output of this command is an error like this one:

E: 15binfmt: touch: cannot touch '/var/run/schroot/mount/bullseye-armhf-dev-cce33164-30dc-4e03-85d7-ec441246e808/usr/libexec/qemu-binfmt/arm-binfmt-P': No such file or directory
E: 15binfmt: touch: cannot touch '/var/run/schroot/mount/bullseye-armhf-dev-cce33164-30dc-4e03-85d7-ec441246e808/usr/libexec/qemu-binfmt/arm-binfmt-P': No such file or directory
E: bullseye-armhf-dev-cce33164-30dc-4e03-85d7-ec441246e808: Chroot setup failed: stage=setup-start

I've expect to chroot like in the past but I'm unable because in my
rootfs there are not /usr/libexec/qemu-binfmt/arm-binfmt-P

Best regards,

Carlos Sanmartín

-- System Information:
Debian Release: bullseye/sid
  APT prefers testing
  APT policy: (500, 'testing')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 5.10.0-3-amd64 (SMP w/4 CPU threads)
Locale: LANG=C, LC_CTYPE=C.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages schroot depends on:
ii  libboost-filesystem1.74.0       1.74.0-8
ii  libboost-iostreams1.74.0        1.74.0-8
ii  libboost-program-options1.74.0  1.74.0-8
ii  libc6                           2.31-9
ii  libgcc-s1                       10.2.1-6
ii  libpam0g                        1.4.0-4
ii  libstdc++6                      10.2.1-6
ii  libuuid1                        2.36.1-7
ii  lsb-base                        11.1.0
ii  schroot-common                  1.6.10-11

schroot recommends no packages.

Versions of packages schroot suggests:
pn  aufs-tools | unionfs-fuse  <none>
pn  btrfs-progs                <none>
ii  debootstrap                1.0.123
pn  lvm2                       <none>
ii  qemu-user-static           1:5.2+dfsg-6
pn  zfsutils-linux             <none>

-- no debconf information