From d5e3d1e969d2f65009f718d3100d6565f47f9112 Mon Sep 17 00:00:00 2001
From: Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: Sun, 4 Jan 2015 15:48:29 -0300
Subject: [PATCH] Fix thinko in lock mode enum
Commit 0e5680f4737a9c6aa94aa9e77543e5de60411322 contained a thinko
mixing LOCKMODE with LockTupleMode. This caused misbehavior in the case
where a tuple is marked with a multixact with at most a FOR SHARE lock,
and another transaction tries to acquire a FOR NO KEY EXCLUSIVE lock;
this case should block but doesn't.
Include a new isolation tester spec file to explicitely try all the
tuple lock combinations; without the fix it shows the problem:
starting permutation: s1_begin s1_lcksvpt s1_tuplock2 s2_tuplock3 s1_commit
step s1_begin: BEGIN;
step s1_lcksvpt: SELECT * FROM multixact_conflict FOR KEY SHARE; SAVEPOINT foo;
a
1
step s1_tuplock2: SELECT * FROM multixact_conflict FOR SHARE;
a
1
step s2_tuplock3: SELECT * FROM multixact_conflict FOR NO KEY UPDATE;
a
1
step s1_commit: COMMIT;
With the fixed code, step s2_tuplock3 blocks until session 1 commits,
which is the correct behavior.
All other cases behave correctly.
Backpatch to 9.3, like the commit that introduced the problem.
---
src/backend/access/heap/heapam.c | 6 +-
.../isolation/expected/tuplelock-conflict.out | 469 ++++++++++++++++++
src/test/isolation/isolation_schedule | 1 +
.../isolation/specs/tuplelock-conflict.spec | 63 +++
4 files changed, 537 insertions(+), 2 deletions(-)
create mode 100644 src/test/isolation/expected/tuplelock-conflict.out
create mode 100644 src/test/isolation/specs/tuplelock-conflict.spec
diff --git a/src/backend/access/heap/heapam.c b/src/backend/access/heap/heapam.c
index cd4cc981135..24e300ca001 100644
--- a/src/backend/access/heap/heapam.c
+++ b/src/backend/access/heap/heapam.c
@@ -6102,6 +6102,7 @@ DoesMultiXactIdConflict(MultiXactId multi, uint16 infomask,
int nmembers;
MultiXactMember *members;
bool result = false;
+ LOCKMODE wanted = tupleLockExtraInfo[lockmode].hwlock;
allow_old = !(infomask & HEAP_LOCK_MASK) && HEAP_XMAX_IS_LOCKED_ONLY(infomask);
nmembers = GetMultiXactIdMembers(multi, &members, allow_old,
@@ -6113,11 +6114,12 @@ DoesMultiXactIdConflict(MultiXactId multi, uint16 infomask,
for (i = 0; i < nmembers; i++)
{
TransactionId memxid;
- LockTupleMode memlockmode;
+ LOCKMODE memlockmode;
memlockmode = LOCKMODE_from_mxstatus(members[i].status);
+
/* ignore members that don't conflict with the lock we want */
- if (!DoLockModesConflict(memlockmode, lockmode))
+ if (!DoLockModesConflict(memlockmode, wanted))
continue;
/* ignore members from current xact */
diff --git a/src/test/isolation/expected/tuplelock-conflict.out b/src/test/isolation/expected/tuplelock-conflict.out
new file mode 100644
index 00000000000..1f5c142aee2
--- /dev/null
+++ b/src/test/isolation/expected/tuplelock-conflict.out
@@ -0,0 +1,469 @@
+Parsed test spec with 2 sessions
+
+starting permutation: s1_begin s1_lcksvpt s1_tuplock1 s2_tuplock1 s1_commit
+step s1_begin: BEGIN;
+step s1_lcksvpt: SELECT * FROM multixact_conflict FOR KEY SHARE; SAVEPOINT foo;
+a
+
+1
+step s1_tuplock1: SELECT * FROM multixact_conflict FOR KEY SHARE;
+a
+
+1
+step s2_tuplock1: SELECT * FROM multixact_conflict FOR KEY SHARE;
+a
+
+1
+step s1_commit: COMMIT;
+
+starting permutation: s1_begin s1_lcksvpt s1_tuplock1 s2_tuplock2 s1_commit
+step s1_begin: BEGIN;
+step s1_lcksvpt: SELECT * FROM multixact_conflict FOR KEY SHARE; SAVEPOINT foo;
+a
+
+1
+step s1_tuplock1: SELECT * FROM multixact_conflict FOR KEY SHARE;
+a
+
+1
+step s2_tuplock2: SELECT * FROM multixact_conflict FOR SHARE;
+a
+
+1
+step s1_commit: COMMIT;
+
+starting permutation: s1_begin s1_lcksvpt s1_tuplock1 s2_tuplock3 s1_commit
+step s1_begin: BEGIN;
+step s1_lcksvpt: SELECT * FROM multixact_conflict FOR KEY SHARE; SAVEPOINT foo;
+a
+
+1
+step s1_tuplock1: SELECT * FROM multixact_conflict FOR KEY SHARE;
+a
+
+1
+step s2_tuplock3: SELECT * FROM multixact_conflict FOR NO KEY UPDATE;
+a
+
+1
+step s1_commit: COMMIT;
+
+starting permutation: s1_begin s1_lcksvpt s1_tuplock1 s2_tuplock4 s1_commit
+step s1_begin: BEGIN;
+step s1_lcksvpt: SELECT * FROM multixact_conflict FOR KEY SHARE; SAVEPOINT foo;
+a
+
+1
+step s1_tuplock1: SELECT * FROM multixact_conflict FOR KEY SHARE;
+a
+
+1
+step s2_tuplock4: SELECT * FROM multixact_conflict FOR UPDATE; <waiting ...>
+step s1_commit: COMMIT;
+step s2_tuplock4: <... completed>
+a
+
+1
+
+starting permutation: s1_begin s1_lcksvpt s1_tuplock2 s2_tuplock1 s1_commit
+step s1_begin: BEGIN;
+step s1_lcksvpt: SELECT * FROM multixact_conflict FOR KEY SHARE; SAVEPOINT foo;
+a
+
+1
+step s1_tuplock2: SELECT * FROM multixact_conflict FOR SHARE;
+a
+
+1
+step s2_tuplock1: SELECT * FROM multixact_conflict FOR KEY SHARE;
+a
+
+1
+step s1_commit: COMMIT;
+
+starting permutation: s1_begin s1_lcksvpt s1_tuplock2 s2_tuplock2 s1_commit
+step s1_begin: BEGIN;
+step s1_lcksvpt: SELECT * FROM multixact_conflict FOR KEY SHARE; SAVEPOINT foo;
+a
+
+1
+step s1_tuplock2: SELECT * FROM multixact_conflict FOR SHARE;
+a
+
+1
+step s2_tuplock2: SELECT * FROM multixact_conflict FOR SHARE;
+a
+
+1
+step s1_commit: COMMIT;
+
+starting permutation: s1_begin s1_lcksvpt s1_tuplock2 s2_tuplock3 s1_commit
+step s1_begin: BEGIN;
+step s1_lcksvpt: SELECT * FROM multixact_conflict FOR KEY SHARE; SAVEPOINT foo;
+a
+
+1
+step s1_tuplock2: SELECT * FROM multixact_conflict FOR SHARE;
+a
+
+1
+step s2_tuplock3: SELECT * FROM multixact_conflict FOR NO KEY UPDATE; <waiting ...>
+step s1_commit: COMMIT;
+step s2_tuplock3: <... completed>
+a
+
+1
+
+starting permutation: s1_begin s1_lcksvpt s1_tuplock2 s2_tuplock4 s1_commit
+step s1_begin: BEGIN;
+step s1_lcksvpt: SELECT * FROM multixact_conflict FOR KEY SHARE; SAVEPOINT foo;
+a
+
+1
+step s1_tuplock2: SELECT * FROM multixact_conflict FOR SHARE;
+a
+
+1
+step s2_tuplock4: SELECT * FROM multixact_conflict FOR UPDATE; <waiting ...>
+step s1_commit: COMMIT;
+step s2_tuplock4: <... completed>
+a
+
+1
+
+starting permutation: s1_begin s1_lcksvpt s1_tuplock3 s2_tuplock1 s1_commit
+step s1_begin: BEGIN;
+step s1_lcksvpt: SELECT * FROM multixact_conflict FOR KEY SHARE; SAVEPOINT foo;
+a
+
+1
+step s1_tuplock3: SELECT * FROM multixact_conflict FOR NO KEY UPDATE;
+a
+
+1
+step s2_tuplock1: SELECT * FROM multixact_conflict FOR KEY SHARE;
+a
+
+1
+step s1_commit: COMMIT;
+
+starting permutation: s1_begin s1_lcksvpt s1_tuplock3 s2_tuplock2 s1_commit
+step s1_begin: BEGIN;
+step s1_lcksvpt: SELECT * FROM multixact_conflict FOR KEY SHARE; SAVEPOINT foo;
+a
+
+1
+step s1_tuplock3: SELECT * FROM multixact_conflict FOR NO KEY UPDATE;
+a
+
+1
+step s2_tuplock2: SELECT * FROM multixact_conflict FOR SHARE; <waiting ...>
+step s1_commit: COMMIT;
+step s2_tuplock2: <... completed>
+a
+
+1
+
+starting permutation: s1_begin s1_lcksvpt s1_tuplock3 s2_tuplock3 s1_commit
+step s1_begin: BEGIN;
+step s1_lcksvpt: SELECT * FROM multixact_conflict FOR KEY SHARE; SAVEPOINT foo;
+a
+
+1
+step s1_tuplock3: SELECT * FROM multixact_conflict FOR NO KEY UPDATE;
+a
+
+1
+step s2_tuplock3: SELECT * FROM multixact_conflict FOR NO KEY UPDATE; <waiting ...>
+step s1_commit: COMMIT;
+step s2_tuplock3: <... completed>
+a
+
+1
+
+starting permutation: s1_begin s1_lcksvpt s1_tuplock3 s2_tuplock4 s1_commit
+step s1_begin: BEGIN;
+step s1_lcksvpt: SELECT * FROM multixact_conflict FOR KEY SHARE; SAVEPOINT foo;
+a
+
+1
+step s1_tuplock3: SELECT * FROM multixact_conflict FOR NO KEY UPDATE;
+a
+
+1
+step s2_tuplock4: SELECT * FROM multixact_conflict FOR UPDATE; <waiting ...>
+step s1_commit: COMMIT;
+step s2_tuplock4: <... completed>
+a
+
+1
+
+starting permutation: s1_begin s1_lcksvpt s1_tuplock4 s2_tuplock1 s1_commit
+step s1_begin: BEGIN;
+step s1_lcksvpt: SELECT * FROM multixact_conflict FOR KEY SHARE; SAVEPOINT foo;
+a
+
+1
+step s1_tuplock4: SELECT * FROM multixact_conflict FOR UPDATE;
+a
+
+1
+step s2_tuplock1: SELECT * FROM multixact_conflict FOR KEY SHARE; <waiting ...>
+step s1_commit: COMMIT;
+step s2_tuplock1: <... completed>
+a
+
+1
+
+starting permutation: s1_begin s1_lcksvpt s1_tuplock4 s2_tuplock2 s1_commit
+step s1_begin: BEGIN;
+step s1_lcksvpt: SELECT * FROM multixact_conflict FOR KEY SHARE; SAVEPOINT foo;
+a
+
+1
+step s1_tuplock4: SELECT * FROM multixact_conflict FOR UPDATE;
+a
+
+1
+step s2_tuplock2: SELECT * FROM multixact_conflict FOR SHARE; <waiting ...>
+step s1_commit: COMMIT;
+step s2_tuplock2: <... completed>
+a
+
+1
+
+starting permutation: s1_begin s1_lcksvpt s1_tuplock4 s2_tuplock3 s1_commit
+step s1_begin: BEGIN;
+step s1_lcksvpt: SELECT * FROM multixact_conflict FOR KEY SHARE; SAVEPOINT foo;
+a
+
+1
+step s1_tuplock4: SELECT * FROM multixact_conflict FOR UPDATE;
+a
+
+1
+step s2_tuplock3: SELECT * FROM multixact_conflict FOR NO KEY UPDATE; <waiting ...>
+step s1_commit: COMMIT;
+step s2_tuplock3: <... completed>
+a
+
+1
+
+starting permutation: s1_begin s1_lcksvpt s1_tuplock4 s2_tuplock4 s1_commit
+step s1_begin: BEGIN;
+step s1_lcksvpt: SELECT * FROM multixact_conflict FOR KEY SHARE; SAVEPOINT foo;
+a
+
+1
+step s1_tuplock4: SELECT * FROM multixact_conflict FOR UPDATE;
+a
+
+1
+step s2_tuplock4: SELECT * FROM multixact_conflict FOR UPDATE; <waiting ...>
+step s1_commit: COMMIT;
+step s2_tuplock4: <... completed>
+a
+
+1
+
+starting permutation: s1_begin s1_tuplock1 s2_tuplock1 s1_commit
+step s1_begin: BEGIN;
+step s1_tuplock1: SELECT * FROM multixact_conflict FOR KEY SHARE;
+a
+
+1
+step s2_tuplock1: SELECT * FROM multixact_conflict FOR KEY SHARE;
+a
+
+1
+step s1_commit: COMMIT;
+
+starting permutation: s1_begin s1_tuplock1 s2_tuplock2 s1_commit
+step s1_begin: BEGIN;
+step s1_tuplock1: SELECT * FROM multixact_conflict FOR KEY SHARE;
+a
+
+1
+step s2_tuplock2: SELECT * FROM multixact_conflict FOR SHARE;
+a
+
+1
+step s1_commit: COMMIT;
+
+starting permutation: s1_begin s1_tuplock1 s2_tuplock3 s1_commit
+step s1_begin: BEGIN;
+step s1_tuplock1: SELECT * FROM multixact_conflict FOR KEY SHARE;
+a
+
+1
+step s2_tuplock3: SELECT * FROM multixact_conflict FOR NO KEY UPDATE;
+a
+
+1
+step s1_commit: COMMIT;
+
+starting permutation: s1_begin s1_tuplock1 s2_tuplock4 s1_commit
+step s1_begin: BEGIN;
+step s1_tuplock1: SELECT * FROM multixact_conflict FOR KEY SHARE;
+a
+
+1
+step s2_tuplock4: SELECT * FROM multixact_conflict FOR UPDATE; <waiting ...>
+step s1_commit: COMMIT;
+step s2_tuplock4: <... completed>
+a
+
+1
+
+starting permutation: s1_begin s1_tuplock2 s2_tuplock1 s1_commit
+step s1_begin: BEGIN;
+step s1_tuplock2: SELECT * FROM multixact_conflict FOR SHARE;
+a
+
+1
+step s2_tuplock1: SELECT * FROM multixact_conflict FOR KEY SHARE;
+a
+
+1
+step s1_commit: COMMIT;
+
+starting permutation: s1_begin s1_tuplock2 s2_tuplock2 s1_commit
+step s1_begin: BEGIN;
+step s1_tuplock2: SELECT * FROM multixact_conflict FOR SHARE;
+a
+
+1
+step s2_tuplock2: SELECT * FROM multixact_conflict FOR SHARE;
+a
+
+1
+step s1_commit: COMMIT;
+
+starting permutation: s1_begin s1_tuplock2 s2_tuplock3 s1_commit
+step s1_begin: BEGIN;
+step s1_tuplock2: SELECT * FROM multixact_conflict FOR SHARE;
+a
+
+1
+step s2_tuplock3: SELECT * FROM multixact_conflict FOR NO KEY UPDATE; <waiting ...>
+step s1_commit: COMMIT;
+step s2_tuplock3: <... completed>
+a
+
+1
+
+starting permutation: s1_begin s1_tuplock2 s2_tuplock4 s1_commit
+step s1_begin: BEGIN;
+step s1_tuplock2: SELECT * FROM multixact_conflict FOR SHARE;
+a
+
+1
+step s2_tuplock4: SELECT * FROM multixact_conflict FOR UPDATE; <waiting ...>
+step s1_commit: COMMIT;
+step s2_tuplock4: <... completed>
+a
+
+1
+
+starting permutation: s1_begin s1_tuplock3 s2_tuplock1 s1_commit
+step s1_begin: BEGIN;
+step s1_tuplock3: SELECT * FROM multixact_conflict FOR NO KEY UPDATE;
+a
+
+1
+step s2_tuplock1: SELECT * FROM multixact_conflict FOR KEY SHARE;
+a
+
+1
+step s1_commit: COMMIT;
+
+starting permutation: s1_begin s1_tuplock3 s2_tuplock2 s1_commit
+step s1_begin: BEGIN;
+step s1_tuplock3: SELECT * FROM multixact_conflict FOR NO KEY UPDATE;
+a
+
+1
+step s2_tuplock2: SELECT * FROM multixact_conflict FOR SHARE; <waiting ...>
+step s1_commit: COMMIT;
+step s2_tuplock2: <... completed>
+a
+
+1
+
+starting permutation: s1_begin s1_tuplock3 s2_tuplock3 s1_commit
+step s1_begin: BEGIN;
+step s1_tuplock3: SELECT * FROM multixact_conflict FOR NO KEY UPDATE;
+a
+
+1
+step s2_tuplock3: SELECT * FROM multixact_conflict FOR NO KEY UPDATE; <waiting ...>
+step s1_commit: COMMIT;
+step s2_tuplock3: <... completed>
+a
+
+1
+
+starting permutation: s1_begin s1_tuplock3 s2_tuplock4 s1_commit
+step s1_begin: BEGIN;
+step s1_tuplock3: SELECT * FROM multixact_conflict FOR NO KEY UPDATE;
+a
+
+1
+step s2_tuplock4: SELECT * FROM multixact_conflict FOR UPDATE; <waiting ...>
+step s1_commit: COMMIT;
+step s2_tuplock4: <... completed>
+a
+
+1
+
+starting permutation: s1_begin s1_tuplock4 s2_tuplock1 s1_commit
+step s1_begin: BEGIN;
+step s1_tuplock4: SELECT * FROM multixact_conflict FOR UPDATE;
+a
+
+1
+step s2_tuplock1: SELECT * FROM multixact_conflict FOR KEY SHARE; <waiting ...>
+step s1_commit: COMMIT;
+step s2_tuplock1: <... completed>
+a
+
+1
+
+starting permutation: s1_begin s1_tuplock4 s2_tuplock2 s1_commit
+step s1_begin: BEGIN;
+step s1_tuplock4: SELECT * FROM multixact_conflict FOR UPDATE;
+a
+
+1
+step s2_tuplock2: SELECT * FROM multixact_conflict FOR SHARE; <waiting ...>
+step s1_commit: COMMIT;
+step s2_tuplock2: <... completed>
+a
+
+1
+
+starting permutation: s1_begin s1_tuplock4 s2_tuplock3 s1_commit
+step s1_begin: BEGIN;
+step s1_tuplock4: SELECT * FROM multixact_conflict FOR UPDATE;
+a
+
+1
+step s2_tuplock3: SELECT * FROM multixact_conflict FOR NO KEY UPDATE; <waiting ...>
+step s1_commit: COMMIT;
+step s2_tuplock3: <... completed>
+a
+
+1
+
+starting permutation: s1_begin s1_tuplock4 s2_tuplock4 s1_commit
+step s1_begin: BEGIN;
+step s1_tuplock4: SELECT * FROM multixact_conflict FOR UPDATE;
+a
+
+1
+step s2_tuplock4: SELECT * FROM multixact_conflict FOR UPDATE; <waiting ...>
+step s1_commit: COMMIT;
+step s2_tuplock4: <... completed>
+a
+
+1
diff --git a/src/test/isolation/isolation_schedule b/src/test/isolation/isolation_schedule
index 79a79568143..c055a534766 100644
--- a/src/test/isolation/isolation_schedule
+++ b/src/test/isolation/isolation_schedule
@@ -22,6 +22,7 @@ test: aborted-keyrevoke
test: multixact-no-deadlock
test: multixact-no-forget
test: propagate-lock-delete
+test: tuplelock-conflict
test: nowait
test: nowait-2
test: nowait-3
diff --git a/src/test/isolation/specs/tuplelock-conflict.spec b/src/test/isolation/specs/tuplelock-conflict.spec
new file mode 100644
index 00000000000..922b572f2d7
--- /dev/null
+++ b/src/test/isolation/specs/tuplelock-conflict.spec
@@ -0,0 +1,63 @@
+# Here we verify that tuple lock levels conform to their documented
+# conflict tables.
+
+setup {
+ DROP TABLE IF EXISTS multixact_conflict;
+ CREATE TABLE multixact_conflict (a int primary key);
+ INSERT INTO multixact_conflict VALUES (1);
+}
+
+teardown {
+ DROP TABLE multixact_conflict;
+}
+
+session "s1"
+step "s1_begin" { BEGIN; }
+step "s1_lcksvpt" { SELECT * FROM multixact_conflict FOR KEY SHARE; SAVEPOINT foo; }
+step "s1_tuplock1" { SELECT * FROM multixact_conflict FOR KEY SHARE; }
+step "s1_tuplock2" { SELECT * FROM multixact_conflict FOR SHARE; }
+step "s1_tuplock3" { SELECT * FROM multixact_conflict FOR NO KEY UPDATE; }
+step "s1_tuplock4" { SELECT * FROM multixact_conflict FOR UPDATE; }
+step "s1_commit" { COMMIT; }
+
+session "s2"
+step "s2_tuplock1" { SELECT * FROM multixact_conflict FOR KEY SHARE; }
+step "s2_tuplock2" { SELECT * FROM multixact_conflict FOR SHARE; }
+step "s2_tuplock3" { SELECT * FROM multixact_conflict FOR NO KEY UPDATE; }
+step "s2_tuplock4" { SELECT * FROM multixact_conflict FOR UPDATE; }
+
+# The version with savepoints test the multixact cases
+permutation "s1_begin" "s1_lcksvpt" "s1_tuplock1" "s2_tuplock1" "s1_commit"
+permutation "s1_begin" "s1_lcksvpt" "s1_tuplock1" "s2_tuplock2" "s1_commit"
+permutation "s1_begin" "s1_lcksvpt" "s1_tuplock1" "s2_tuplock3" "s1_commit"
+permutation "s1_begin" "s1_lcksvpt" "s1_tuplock1" "s2_tuplock4" "s1_commit"
+permutation "s1_begin" "s1_lcksvpt" "s1_tuplock2" "s2_tuplock1" "s1_commit"
+permutation "s1_begin" "s1_lcksvpt" "s1_tuplock2" "s2_tuplock2" "s1_commit"
+permutation "s1_begin" "s1_lcksvpt" "s1_tuplock2" "s2_tuplock3" "s1_commit"
+permutation "s1_begin" "s1_lcksvpt" "s1_tuplock2" "s2_tuplock4" "s1_commit"
+permutation "s1_begin" "s1_lcksvpt" "s1_tuplock3" "s2_tuplock1" "s1_commit"
+permutation "s1_begin" "s1_lcksvpt" "s1_tuplock3" "s2_tuplock2" "s1_commit"
+permutation "s1_begin" "s1_lcksvpt" "s1_tuplock3" "s2_tuplock3" "s1_commit"
+permutation "s1_begin" "s1_lcksvpt" "s1_tuplock3" "s2_tuplock4" "s1_commit"
+permutation "s1_begin" "s1_lcksvpt" "s1_tuplock4" "s2_tuplock1" "s1_commit"
+permutation "s1_begin" "s1_lcksvpt" "s1_tuplock4" "s2_tuplock2" "s1_commit"
+permutation "s1_begin" "s1_lcksvpt" "s1_tuplock4" "s2_tuplock3" "s1_commit"
+permutation "s1_begin" "s1_lcksvpt" "s1_tuplock4" "s2_tuplock4" "s1_commit"
+
+# no multixacts here
+permutation "s1_begin" "s1_tuplock1" "s2_tuplock1" "s1_commit"
+permutation "s1_begin" "s1_tuplock1" "s2_tuplock2" "s1_commit"
+permutation "s1_begin" "s1_tuplock1" "s2_tuplock3" "s1_commit"
+permutation "s1_begin" "s1_tuplock1" "s2_tuplock4" "s1_commit"
+permutation "s1_begin" "s1_tuplock2" "s2_tuplock1" "s1_commit"
+permutation "s1_begin" "s1_tuplock2" "s2_tuplock2" "s1_commit"
+permutation "s1_begin" "s1_tuplock2" "s2_tuplock3" "s1_commit"
+permutation "s1_begin" "s1_tuplock2" "s2_tuplock4" "s1_commit"
+permutation "s1_begin" "s1_tuplock3" "s2_tuplock1" "s1_commit"
+permutation "s1_begin" "s1_tuplock3" "s2_tuplock2" "s1_commit"
+permutation "s1_begin" "s1_tuplock3" "s2_tuplock3" "s1_commit"
+permutation "s1_begin" "s1_tuplock3" "s2_tuplock4" "s1_commit"
+permutation "s1_begin" "s1_tuplock4" "s2_tuplock1" "s1_commit"
+permutation "s1_begin" "s1_tuplock4" "s2_tuplock2" "s1_commit"
+permutation "s1_begin" "s1_tuplock4" "s2_tuplock3" "s1_commit"
+permutation "s1_begin" "s1_tuplock4" "s2_tuplock4" "s1_commit"
--
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