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  1. Core Server
  2. SERVER-53656

Execution stats level explain of aggregate command segfaults when SBE is enabled

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       ➜ cat repro.js
(function() {
"use strict";

const coll = db.explain_sample;
coll.drop();

// Turn on SBE.
assert.commandWorked(
    db.adminCommand({setParameter: 1, internalQueryEnableSlotBasedExecutionEngine: true}));

assert.commandWorked(coll.insert({a: 1}));

// Explain a $sample pipeline.
printjson(coll.explain("allPlansExecution").aggregate([{$sample: {size: 10}}]));
}());
 ➜ python3 buildscripts/resmoke.py run --suites=core repro.js
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      ➜ cat repro.js (function() { "use strict" ; const coll = db.explain_sample; coll.drop(); // Turn on SBE. assert .commandWorked( db.adminCommand({setParameter: 1, internalQueryEnableSlotBasedExecutionEngine: true })); assert .commandWorked(coll.insert({a: 1})); // Explain a $sample pipeline. printjson(coll.explain( "allPlansExecution" ).aggregate([{$sample: {size: 10}}])); }()); ➜ python3 buildscripts/resmoke.py run --suites=core repro.js
    • Query 2021-01-11, Query 2021-01-25
    • 7

      See "Steps to Reproduce". I haven't yet dug into the details of why this crash recurs, but it can be reproduced trivially with the short provided script.

            Assignee:
            david.storch@mongodb.com David Storch
            Reporter:
            david.storch@mongodb.com David Storch
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              Created:
              Updated:
              Resolved: