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/**
* Tests that checking out an already checked out session doesn't lead to a self-deadlock. This is a
* regression test for SERVER-36007.
*
* @tags: [uses_transactions]
*/
(function() {
"use strict";
load("jstests/libs/parallelTester.js");
const rst = new ReplSetTest({nodes: 1});
rst.startSet();
rst.initiate();
const primary = rst.getPrimary();
const db = primary.getDB("test");
function doInsertWithSession(host, lsid, txnNumber) {
try {
const conn = new Mongo(host);
const db = conn.getDB("test");
assert.commandWorked(db.runCommand({
insert: "mycoll",
documents: [{_id: txnNumber}],
lsid: {id: eval(lsid)},
txnNumber: NumberLong(txnNumber),
}));
return {ok: 1};
} catch (e) {
print("doInsertWithSession failed with " + e.toString());
return {ok: 0, error: e.toString(), stack: e.stack};
}
}
let thread1;
let thread2;
// We fsyncLock the server so that a transaction operation will block waiting for a lock.
assert.commandWorked(db.fsyncLock());
try {
// JavaScript objects backed by C++ objects (e.g. BSON values) do not serialize correctly
// when passed through the ScopedThread constructor. To work around this behavior, we
// instead pass a stringified form of the JavaScript object through the ScopedThread
// constructor and use eval() to rehydrate it.
const lsid = UUID();
thread1 = new ScopedThread(doInsertWithSession, primary.host, tojson(lsid), 1);
thread1.start();
assert.soon(
() => {
const ops = db.currentOp({
"command.insert": "mycoll",
"command.txnNumber": {$eq: 1},
waitingForLock: true
});
return ops.inprog.length === 1;
},
() => {
return "insert operation with txnNumber 1 was not found: " + tojson(db.currentOp());
});
thread2 = new ScopedThread(doInsertWithSession, primary.host, tojson(lsid), 2);
thread2.start();
// Run currentOp() again to ensure that thread2 has started its insert command.
assert.soon(
() => {
const ops =
db.currentOp({"command.insert": "mycoll", "command.txnNumber": {$eq: 2}});
return ops.inprog.length === 1;
},
() => {
return "insert operation with txnNumber 2 was not found: " + tojson(db.currentOp());
});
} finally {
// We run the fsyncUnlock command in a finally block to avoid leaving the server fsyncLock'd
// if the test were to fail.
assert.commandWorked(db.fsyncUnlock());
}
thread1.join();
thread2.join();
assert.commandWorked(thread1.returnData());
assert.commandWorked(thread2.returnData());
rst.stopSet();
})();
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