test: flaky box/access.test.lua test fails on 272 result line

[avtikhon]

Tarantool version:
Tarantool 2.6.0-153-g949c349b7
Target: Darwin-x86_64-RelWithDebInfo
Build options: cmake . -DCMAKE_INSTALL_PREFIX=/usr/local -DENABLE_BACKTRACE=ON
Compiler: /Library/Developer/CommandLineTools/usr/bin/cc /Library/Developer/CommandLineTools/usr/bin/c++
C_FLAGS: -Wno-unknown-pragmas -fexceptions -funwind-tables -fno-omit-frame-pointer -fno-stack-protector -fno-common -msse2 -std=c11 -Wall -Wextra -Wno-strict-aliasing -Wno-char-subscripts -Wno-gnu-alignof-expression -Werror
CXX_FLAGS: -Wno-unknown-pragmas -fexceptions -funwind-tables -fno-omit-frame-pointer -fno-stack-protector -fno-common -msse2 -std=c++11 -Wall -Wextra -Wno-strict-aliasing -Wno-char-subscripts -Wno-invalid-offsetof -Wno-gnu-alignof-expression -Werror

OS version:
OSX 14

Bug description:
https://gitlab.com/tarantool/tarantool/-/jobs/784761505#L7212

artifacts.zip

results file checksum: f94a9c1e206e1db81b9f39666ea14cf7

Segmentation fault
  code: SEGV_MAPERR
  addr: 0x2974656c13
  context: 0x10687fca0
  siginfo: 0x10687fc38
Current time: 1602459367
Please file a bug at http://github.com/tarantool/tarantool/issues
Attempting backtrace... Note: since the server has already crashed, 
this may fail as well
#0  0x102866929 in print_backtrace+9
tarantool/tarantool#1  0x102707f48 in _ZL12sig_fatal_cbiP9__siginfoPv+158
tarantool/tarantool#2  0x7fff723ecb5d in _sigtramp+1d

[023] --- box/access.result	Mon Oct 12 02:02:37 2020
[023] +++ box/access.reject	Mon Oct 12 02:31:51 2020
[023] @@ -272,7 +272,89 @@
[023]  	box.schema.user.drop
[023]  );
[023]  ---
[023] -- All tests passed
[023] +- 'Errors:
[023] +
[023] +  valid_testcases 3: Unsupported role privilege ''execute''
[023] +
[023] +  valid_testcases 4: Unsupported role privilege ''execute''
[023] +
[023] +  valid_testcases 5: Unsupported role privilege ''execute''
[023] +
[023] +  valid_testcases 6: Unsupported role privilege ''execute''
[023] +
[023] +  valid_testcases 7: Unsupported role privilege ''execute''
[023] +
[023] +  valid_testcases 8: Unsupported role privilege ''execute''
[023] +
[023] +  valid_testcases 9: Unsupported role privilege ''execute''
[023] +
[023] +  valid_testcases 10: Unsupported role privilege ''execute''
[023] +
[023] +  valid_testcases 11: Unsupported role privilege ''execute''
[023] +
[023] +  valid_testcases 12: Unsupported role privilege ''execute''
[023] +
[023] +  valid_testcases 13: Unsupported role privilege ''execute''
[023] +
[023] +  valid_testcases 14: Unsupported role privilege ''execute''
[023] +
[023] +  valid_testcases 15: Unsupported role privilege ''execute''
[023] +
[023] +  valid_testcases 16: Unsupported role privilege ''execute''
[023] +
[023] +  valid_testcases 17: Unsupported role privilege ''execute''
[023] +
[023] +  valid_testcases 18: Unsupported role privilege ''execute''
[023] +
[023] +  valid_testcases 19: Unsupported role privilege ''execute''
[023] +
[023] +  valid_testcases 20: Unsupported role privilege ''execute''
[023] +
[023] +  valid_testcases 21: Unsupported role privilege ''execute''
[023] +
[023] +  valid_testcases 22: Unsupported role privilege ''execute''
[023] +
[023] +  valid_testcases 23: Unsupported role privilege ''execute''
[023] +
[023] +  valid_testcases 24: Unsupported role privilege ''execute''
[023] +
[023] +  valid_testcases 25: Unsupported role privilege ''execute''
[023] +
[023] +  valid_testcases 26: Unsupported role privilege ''execute''
[023] +
[023] +  valid_testcases 27: Unsupported role privilege ''execute''
[023] +
[023] +  valid_testcases 28: Unsupported role privilege ''execute''
[023] +
[023] +  valid_testcases 29: Unsupported role privilege ''execute''
[023] +
[023] +  valid_testcases 30: A limit on the total number of users has been reached: 32
[023] +
[023] +  valid_testcases 31: A limit on the total number of users has been reached: 32
[023] +
[023] +  valid_testcases 32: A limit on the total number of users has been reached: 32
[023] +
[023] +  valid_testcases 33: A limit on the total number of users has been reached: 32
[023] +
[023] +  valid_testcases 34: A limit on the total number of users has been reached: 32
[023] +
[023] +  valid_testcases 35: A limit on the total number of users has been reached: 32
[023] +
[023] +  valid_testcases 36: A limit on the total number of users has been reached: 32
[023] +
[023] +  valid_testcases 37: A limit on the total number of users has been reached: 32
[023] +
[023] +  valid_testcases 38: A limit on the total number of users has been reached: 32
[023] +
[023] +  valid_testcases 39: A limit on the total number of users has been reached: 32
[023] +
[023] +  valid_testcases 40: A limit on the total number of users has been reached: 32
[023] +
[023] +  valid_testcases 41: A limit on the total number of users has been reached: 32
[023] +
[023] +  valid_testcases 42: A limit on the total number of users has been reached: 32
[023] +
[023] +  valid_testcases 43: A limit on the total number of users has been reached: 32'
[023]  ...
[023]  identifier.run_test(
[023]  	function (identifier)

Steps to reproduce:

Optional (but very desirable):

• coredump
• backtrace
• netstat