innobackupex and SST xtrabackup fails if log specified in my.cnf

[Stefano]

If in my.cnf is specified "log"

i.e.
....
....
log=/tmp/query.log
....
....

innobackupex fails and also xtrabackup SST

innobackupex output:

(....)

Unknown suffix '/' used for variable 'log-copy-interval' (value '/tmp/query.log')
xtrabackup: Error while setting value '/tmp/query.log' to 'log-copy-interval'
innobackupex: Error: no 'mysqld' group in MySQL options at /usr/bin/innobackupex line 4350.

SST in mariadb error.log (log in my.cnf specified in both sender and receiver):

141120 16:20:34 [Note] WSREP: Member 1.0 (1.2.3.4) requested state transfer from '*any*'. Selected 0.0 (1.2.3.5)(SYNCED) as donor.
141120 16:20:34 [Note] WSREP: Shifting PRIMARY -> JOINER (TO: 52552847)
141120 16:20:34 [Note] WSREP: Requesting state transfer: success, donor: 0
tar: This does not look like a tar archive
tar: Exiting with failure status due to previous errors
WSREP_SST: [ERROR] Error while getting data from donor node: exit codes: 0 2 (20141120 16:20:34.457)

[Alexey Kopytov (akopytov)]

This looks like a duplicate of bug #1347698 (fixed in 2.2.5+).