Fail to reconnect to mysql when running with more than one thread

[joseadp]

I am running sysbench with tppc.lua scripts to evaluate the properties of a VM that the database is running. Hence, during sysbench execution, I need to stop MySQL, and restart it afterwards. Sysbench works well when I'm running with a single thread. However, when I increase it to two or more threads, I sysbench stops running.

sysbench /usr/share/sysbench/tpcc.lua --threads=2 --time=3600 --tables=1 --scale=10 --events=100000 --report-csv=yes --report-interval=1 --rand-seed=10 --db-driver=mysql --mysql-host=IP_ADDRESS --mysql-port=3306 --mysql-ignore-errors=all --mysql-db=sbtest --mysql-user=DBtest --mysql-password='Password' run

When I stop MySQL continues working well (around second 6 for the following output). However, I obtain the following error: FATAL: 'thread_run' function failed: (not a string) and sysbench stops running.

sysbench 1.0.20 (using bundled LuaJIT 2.1.0-beta2)

Running the test with following options:
Number of threads: 2
Report intermediate results every 1 second(s)
Initializing random number generator from seed (10).


Initializing worker threads...

Threads started!

1,2,76.79,2144.07,973.31,1009.21,161.55,70.55,0.00,0.00
2,2,71.10,2109.98,962.36,1005.42,142.20,75.82,0.00,0.00
3,2,49.01,1331.40,611.18,622.19,98.03,116.80,0.00,0.00
4,2,55.94,1599.22,732.19,755.16,111.88,127.81,0.00,0.00
5,2,11.97,295.28,134.67,136.67,23.94,102.97,1.00,0.00
6,2,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00
7,2,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00
8,2,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00
9,2,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00

FATAL: `thread_run' function failed: (not a string)

I noticed that thread_run function is in the following lua file:

sysbench/src/lua/internal/sysbench.lua

Line 28 in 2ca9e3f

function thread_run(thread_id)

However, I could not understand why sysbench is throwing this error. Can you provide me some guidance?