src/test/isolation/specs/deadlock-hard.spec

# This is a straightforward deadlock scenario.  Since it involves more than
# two processes, the main lock detector will find the problem and rollback
# the session that first discovers it.  Set deadlock_timeout in each session
# so that it's predictable which session fails.

setup
{
  CREATE TABLE a1 ();
  CREATE TABLE a2 ();
  CREATE TABLE a3 ();
  CREATE TABLE a4 ();
  CREATE TABLE a5 ();
  CREATE TABLE a6 ();
  CREATE TABLE a7 ();
  CREATE TABLE a8 ();
}

teardown
{
  DROP TABLE a1, a2, a3, a4, a5, a6, a7, a8;
}

session s1
setup		{ BEGIN; SET deadlock_timeout = '100s'; }
step s1a1	{ LOCK TABLE a1; }
step s1a2	{ LOCK TABLE a2; }
step s1c	{ COMMIT; }

session s2
setup		{ BEGIN; SET deadlock_timeout = '100s'; }
step s2a2	{ LOCK TABLE a2; }
step s2a3	{ LOCK TABLE a3; }
step s2c	{ COMMIT; }

session s3
setup		{ BEGIN; SET deadlock_timeout = '100s'; }
step s3a3	{ LOCK TABLE a3; }
step s3a4	{ LOCK TABLE a4; }
step s3c	{ COMMIT; }

session s4
setup		{ BEGIN; SET deadlock_timeout = '100s'; }
step s4a4	{ LOCK TABLE a4; }
step s4a5	{ LOCK TABLE a5; }
step s4c	{ COMMIT; }

session s5
setup		{ BEGIN; SET deadlock_timeout = '100s'; }
step s5a5	{ LOCK TABLE a5; }
step s5a6	{ LOCK TABLE a6; }
step s5c	{ COMMIT; }

session s6
setup		{ BEGIN; SET deadlock_timeout = '100s'; }
step s6a6	{ LOCK TABLE a6; }
step s6a7	{ LOCK TABLE a7; }
step s6c	{ COMMIT; }

session s7
setup		{ BEGIN; SET deadlock_timeout = '100s'; }
step s7a7	{ LOCK TABLE a7; }
step s7a8	{ LOCK TABLE a8; }
step s7c	{ COMMIT; }

session s8
setup		{ BEGIN; SET deadlock_timeout = '10ms'; }
step s8a8	{ LOCK TABLE a8; }
step s8a1	{ LOCK TABLE a1; }
step s8c	{ COMMIT; }

# Note: when s8a1 detects the deadlock and fails, s7a8 is released, making
# it timing-dependent which query completion is received first by the tester.
# To ensure output stability, add a blocking mark to force s8a1's completion
# to be reported first.  There is a second timing dependency, too: the tester
# might or might not observe s8a1 during its short lock wait state.  Apply a
# dummy blocking mark to s8a1 to ensure it will be reported as "waiting"
# regardless of that.

permutation s1a1 s2a2 s3a3 s4a4 s5a5 s6a6 s7a7 s8a8 s1a2 s2a3 s3a4 s4a5 s5a6 s6a7 s7a8(s8a1) s8a1(*) s8c s7c s6c s5c s4c s3c s2c s1c