Hi, have you reported your issue in Codership google group? https://groups.google.com/forum/#!forum/codership-team Does Galera report any locking issue in the MariaDB error.log file? 2016-05-02 13:38 GMT+02:00 Ljr Yang <dbmsprog@gmail.com>:

Hi, All Recently, We use Sysbench Test MariaDB 10.1.13. In Test ,We found server lock and can't write . Testing environment: server1: 10.2.1.242 (HP OEM Fusion IO PCIE Card 3.2TB ) server2: 10.2.1.239 (ScanDisk Fusion IO PCIE Card 3.2TB)

sysbench test script: sysbench --test=/usr/share/doc/sysbench/tests/db/oltp.lua --num-threads=16 --mysql-host=localhost --mysql-port=3306 --mysql-socket=/data/mysql2/data/mysql.sock --mysql-user=root --mysql-password=123456 --mysql-db=test --max-time=0 --max-requests=0 --report-interval=1 --oltp-tables-count=16 run

when *wsrep_on = on *, after run a few minutes or a few hours, both server1 and server2 were stucked, all write stoped ,only select statement run normal : ................ [ 815s] threads: 16, tps: 6176.00, reads: 86431.00, writes: 24699.00, response time: 3.37ms (95%), errors: 0.00, reconnects: 0.00 [ 816s] threads: 16, tps: 6064.99, reads: 84907.86, writes: 24256.96, response time: 3.66ms (95%), errors: 0.00, reconnects: 0.00 [ 817s] threads: 16, tps: 6097.00, reads: 85394.05, writes: 24394.02, response time: 3.54ms (95%), errors: 0.00, reconnects: 0.00 [ 818s] threads: 16, tps: 6131.97, reads: 85819.52, writes: 24529.86, response time: 3.65ms (95%), errors: 0.00, reconnects: 0.00 [ 819s] threads: 16, tps: 6143.04, reads: 86036.63, writes: 24575.18, response time: 3.44ms (95%), errors: 0.00, reconnects: 0.00 [ 820s] threads: 16, tps: 5819.80, reads: 81532.22, writes: 23332.20, response time: 3.60ms (95%), errors: 0.00, reconnects: 0.00 [ 821s] threads: 16, tps: 0.00, reads: 0.00, writes: 0.00, response time: 0.00ms (95%), errors: 0.00, reconnects: 0.00 [ 822s] threads: 16, tps: 0.00, reads: 0.00, writes: 0.00, response time: 0.00ms (95%), errors: 0.00, reconnects: 0.00 [ 823s] threads: 16, tps: 0.00, reads: 0.00, writes: 0.00, response time: 0.00ms (95%), errors: 0.00, reconnects: 0.00 [ 824s] threads: 16, tps: 0.00, reads: 0.00, writes: 0.00, response time: 0.00ms (95%), errors: 0.00, reconnects: 0.00 [ 825s] threads: 16, tps: 0.00, reads: 0.00, writes: 0.00, response time: 0.00ms (95%), errors: 0.00, reconnects: 0.00 [ 826s] threads: 16, tps: 0.00, reads: 0.00, writes: 0.00, response time: 0.00ms (95%), errors: 0.00, reconnects: 0.00 ................

In error log file not error info , after execute* pstack `pidof mysqld` > pstack.log*, sysbench run normal again , and start write data.

Every time have this problem, in pstack.log file contains a few lock: #0 0x00007f2b04fe0334 in __lll_lock_wait () from /lib64/libpthread.so.0 #1 0x00007f2b04fdb5d8 in _L_lock_854 () from /lib64/libpthread.so.0 #2 0x00007f2b04fdb4a7 in pthread_mutex_lock () from /lib64/libpthread.so.0 ....................

When *set wsrep_on = off*, Sysbench test MariaDB 10.1.13 normal.

As contrast ,We download Percona-XtraDB-Cluster-5.6.28-rel76.1-25.14.1.Linux.x86_64.ssl101.tar.gz and run sysbench test, found same problem too.

We can't confirm , is it hardware or galera question ? please help analyze ,thank you.

Reference link:

https://en.wikibooks.org/wiki/Linux_Applications_Debugging_Techniques/Deadlo...

http://www.linuxprogrammingblog.com/threads-and-fork-think-twice-before-usin... -- 杨建军

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