flaky test: router/complex_call.test.lua'

[VitaliyaIoffe]

tarantool-ubuntu-focal-d3c3031bd2695a27ade5807351810d1365f0c9fb

router/complex_call.test.lua                                    
[Instance "box_1_c"] Tarantool server failed to start

Last 15 lines of Tarantool Log file [Instance "box_1_c"][/home/runner/work/tarantool/tarantool/test/var/001_router/box_1_c.log]:
2021-10-21 18:23:27.567 [5109] relay/127.0.0.1:58488/101/main I> recover from `/home/runner/work/tarantool/tarantool/test/var/001_router/box_1_c/00000000000000000043.xlog'
2021-10-21 18:23:27.571 [5109] main/113/applier/[email protected]:3302 I> authenticated
2021-10-21 18:23:27.571 [5109] main/113/applier/[email protected]:3302 I> subscribed
2021-10-21 18:23:27.571 [5109] main/113/applier/[email protected]:3302 I> remote vclock {1: 44} local vclock {1: 44}
2021-10-21 18:23:27.571 [5109] main/113/applier/[email protected]:3302 I> RAFT: message {term: 1, state: follower} from 3
2021-10-21 18:23:27.572 [5109] main/132/applierw/[email protected]:3302 C> leaving orphan mode
2021-10-21 18:23:27.832 [5109] main/113/applier/[email protected]:3302 I> can't read row
2021-10-21 18:23:27.832 [5109] main/113/applier/[email protected]:3302 coio.cc:378 !> SystemError unexpected EOF when reading from socket, called on fd 31, aka 127.0.0.1:47472, peer of 127.0.0.1:3302: Broken pipe
2021-10-21 18:23:27.832 [5109] main/113/applier/[email protected]:3302 I> will retry every 0.10 second
2021-10-21 18:23:27.832 [5109] relay/127.0.0.1:58488/101/main coio.cc:378 !> SystemError unexpected EOF when reading from socket, called on fd 25, aka 127.0.0.1:3303, peer of 127.0.0.1:58488: Broken pipe
2021-10-21 18:23:27.832 [5109] relay/127.0.0.1:58488/101/main C> exiting the relay loop
2021-10-21 18:23:27.879 [5109] main C> got signal 15 - Terminated
2021-10-21 18:23:27.879 [5109] main I> tx_binary: stopped
Starting instance box_1_c...
Start failed: builtin/box/console.lua:865: failed to create server localhost:35394: Address already in use

[Instance "test"] Failed to start tarantool instance "box_1_c"
[ fail ]

[Gerold103]

The problem is that the tests can't run in parallel. They use hardcoded ports. Will fail even if you have tests running in some other repository and occupying one of the hardcoded ports. Same as #174.