[Samba] pam_systemd(samba:session): Failed to create session: No such file or directory

Alex samba at abisoft.biz
Tue Jun 23 10:32:18 UTC 2020


There's a file server running CentOS 7 with packaged Samba:
# rpm -qi samba
Name        : samba
Epoch       : 0
Version     : 4.10.4
Release     : 11.el7_8
Architecture: x86_64
Source RPM  : samba-4.10.4-11.el7_8.src.rpm
Build Date  : Tue 12 May 2020 04:31:13 PM UTC
Packager    : CentOS BuildSystem <http://bugs.centos.org>

When a user opens a file share, there's an error coming up in the syslog (however,
it doesn't affect user's ability to open the share):
Jun 23 10:14:37 filer-1 smbd[4572]: pam_systemd(samba:session): pam-systemd initializing
Jun 23 10:14:37 filer-1 smbd[4572]: pam_systemd(samba:session): Asking logind to create session: uid=16777217 pid=4572 service=samba type=tty class=user desktop= seat= vtnr=0 tty=smb/257860650 display= remote=yes remote_user= remote_host=
Jun 23 10:14:37 filer-1 smbd[3944]: pam_systemd(samba:session): Failed to create session: No such file or directory
Jun 23 10:14:37 filer-1 smbd[3944]: pam_unix(samba:session): session opened for user DOMAIN\user by (uid=0)
Jun 23 10:14:47 filer-1 smbd[3944]: pam_unix(samba:session): session closed for user DOMAIN\user

Here is the pam settings for samba:
# cat /etc/pam.d/samba
auth       required     pam_nologin.so
auth       include      password-auth
account    include      password-auth
session    include      password-auth
password   include      password-auth

# cat /etc/pam.d/password-auth
# This file is auto-generated.
# User changes will be destroyed the next time authconfig is run.
session     optional      pam_keyinit.so revoke
session     required      pam_limits.so
-session     optional      pam_systemd.so debug
session     [success=1 default=ignore] pam_succeed_if.so service in crond quiet use_uid
session     required      pam_unix.so

I tried strace samba processes but didn't find anything appropriate. Stracing
systemd-logind displays:
connect(23, {sa_family=AF_UNIX, sun_path="/run/samba/winbindd/pipe"}, 110) = 0
poll([{fd=23, events=POLLIN|POLLOUT|POLLHUP}], 1, -1) = 1 ([{fd=23, revents=POLLOUT}])
write(23, "0\10\0\0\0\0\0\0\0\0\0\0\367\4\0\0\0\10\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 2096) = 2096
poll([{fd=23, events=POLLIN|POLLHUP}], 1, 5000) = 1 ([{fd=23, revents=POLLIN|POLLERR|POLLHUP}])
read(23, 0x7ffd24451f50, 4008)          = -1 ECONNRESET (Connection reset by peer)
close(23)                               = 0
sendmsg(12, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="l\3\1\1\36\0\0\0\222\352\30\0W\0\0\0\5\1u\0\2\0\0\0\6\1s\0\t\0\0\0:1.161534\0\0\0\0\0\0\0\4\1s\0'\0\0\0org.freedesktop.DBus.Error.FileNotFound\0\10\1g\0\1s\0\0", iov_len=104}, {iov_base="\31\0\0\0No such file or directory\0", iov_len=30}], msg_iovlen=2, msg_controllen=0, msg_flags=0}, MSG_DONTWAIT|MSG_NOSIGNAL) = 134

Any ideas how to get that fixed?

Best regards,

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