Package: proftpd-basic
Version: 1.3.5e+r1.3.5-2+deb8u1

After the upgrade from version '1.3.5e-0+deb8u1' to '1.3.5e+r1.3.5-2+deb8u1' 
the sftp session is being terminated when using the command 'mkdir /'.

Before the upgrade following error message got displayed: 'Couldn't create 
directory: Failure' and the session stayed active.

After the upgrade we get the following message from our syslogd displayed in 
our terminal:
MKDIR / type=unknown;UNIX.mode=0777;: symbol lookup error: 
/usr/lib/proftpd/ undefined symbol: pr_gid2str

We are using the following sftp.conf:

<IfModule mod_sftp.c>
  <VirtualHost 172.31.XXX.XXX XXXX:XXXX::XXX>

    SFTPEngine on
    SFTPPAMEngine off
    SFTPLog /var/log/proftpd/sftp.log

    ServerName "XXXXXXXXXXXX"
    ShowSymlinks on
    AllowOverwrite on
    DefaultRoot ~
    ListOptions "-la"

    # Configure the server to listen on the normal SSH2 port, port 22
    Port 115

    # Configure both the RSA and DSA host keys, using the same host key
    # files that OpenSSH uses.
    SFTPHostKey /etc/ssh/ssh_host_rsa_key
    SFTPHostKey /etc/ssh/ssh_host_dsa_key

    # Configure the file used for comparing authorized public keys of users.
    SFTPAuthorizedUserKeys file:~/.ssh/authorized_keys

    # Enable compression
    SFTPCompression delayed

    # Allow the same number of authentication attempts as OpenSSH.
    # It is recommended that you explicitly configure MaxLoginAttempts
    # for your SSH2/SFTP instance to be higher than the normal
    # MaxLoginAttempts value for FTP, as there are more ways to authenticate
    # using SSH2.
    MaxLoginAttempts 6

    # do not log ftp logins to wtmp
    WtmpLog off

    TransferLog /var/log/proftpd/xferlog

The 'mkdir /' command is being used in our backup program and is hardcoded. We 
can't change the commands that are used.

The used version is Debian 8.11
Linux 3.16.0-8-amd64 #1 SMP Debian 3.16.64-2 (2019-04-01) x86_64 GNU/Linux

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