Unable to connect to the server under the user with environment /bin/bash (chroot): connection closed

Symptoms

• The system user is unable to connect to the server via SSH with the chrooted environment:

  # ssh username@203.0.113.2
  <…>
  Connection to 203.0.113.2 closed.

• The errors like this may be found in /var/log/messages:

  CONFIG_TEXT: kernel: [2381259.980854] bash[30893]: segfault at b9002127b4 ip 000000b9002127b4 sp 00007ffdac5cc638 error 14 in libc.so.6[7f2ea39be000+1a1000]

• The following errors are in /var/log/auth.log:

  CONFIG_TEXT: sshd[15442]: Accepted password for username from 203.0.113.2 port 33110 ssh2
  sshd[15442]: pam_unix(sshd:session): session opened for user username by (uid=0)
  systemd-logind[924]: New session 9339 of user username.
  systemd: PAM unable to dlopen(pam_unix.so): /lib/security/pam_unix.so: cannot open shared object file: No such file or directory
  ystemd: PAM adding faulty module: pam_unix.so
  systemd: PAM unable to dlopen(pam_plesk.so): /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.25' not found (required by /lib/x86_64-linux-gnu/libcrypt.so.1)
  systemd: PAM adding faulty module: pam_plesk.so
  sshd[15469]: Received disconnect from 203.0.113.2: 11: disconnected by user
  sshd[15442]: pam_unix(sshd:session): session closed for user username
  systemd-logind[924]: Removed session 9339.

Cause

1. Chroot libraries are not up to date.

2. Libraries on the server are custom or were modified manually.

Resolution

1. Install available system updates and rebuild chroot template using this article .

2. Remove custom or manually modified libraries and install them from the official repositories (corresponding to server Operating System).