centos 7.1 update causing samba core dump

[causbrooks]

we had a centos 7.0 samba server running samba 4.1.1-32.el7_0. the upgrade to centos 7.1 (with samba 4.1.12-21.el7_1) caused samba to start core dumping at an alarming rate until it filled up the hard drive.

the machine is a member of a non-active directory domain with a centos 7.0 samba domain controller.

the [global] section of testparm reads as follows:

workgroup = ARTRS
server string = ARTRS Storage Server
security = DOMAIN
map to guest = Bad User
log file = /var/log/samba/log.%m
max log size = 50
idmap config * : backend = tdb
cups options = raw

i was able to return the machine to service by downgrading libsmbclient, libwbclient, samba, samba-client, samba-common, and samba-libs to 4.1.1-38.el7_0.

unfortunately, i failed to save the /var/log/samba/log.smb file before doing the downgrade, so i have lost the error log. it simply repeated:

../source3/smbd/server.c:429 Unclean shutdown of pid

and

../source3/smbd/server.c:429(remove_child_pid)

hundreds of times.

anyone else experiencing this problem? i've disabled updates for our other samba servers for the time being, but i'd love to get to the bottom of this.

[giulix63]

Just a wild guess: Have you checked pid file smbd.pid in /var/run? Maybe systemctl is continuously trying to restart the service that keeps bailing out because of an existing pid file...

[causbrooks]

there doesn't appear to be anything strange going on with the pid file.

[causbrooks]

one possible difference i've found:

under samba 4.1.1:

# net rpc join member
Enter root's password:
Joined domain ARTRS.

under samba 4.1.12

# net rpc join member
No realm has been specified! Do you really want to join an Active Directory server?
Enter root's password:
No realm has been specified! Do you really want to join an Active Directory server?
Using short domain name -- ARTRS
Joined 'SMBTEST' to domain 'ARTRS'

is it possible that 4.1.12 is not recognizing that we are not running active directory?