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  1. Core Server
  2. SERVER-62207

ReshardCollection with small maxTimeMS can crash the shard due to incorrect BSON object lifetime

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Details

    • Bug
    • Status: Closed
    • Major - P3
    • Resolution: Fixed
    • 5.0.0, 5.2.0, 5.1.0
    • 5.3.0, 5.0.6, 5.2.1
    • Sharding
    • None
    • Fully Compatible
    • ALL
    • v5.2, v5.0
    • Hide

      repro.patch 

      ./buildscripts/resmoke.py run --storageEngine=wiredTiger --storageEngineCacheSizeGB=.50 --suite=sharding  jstests/sharding/repro.js --log=file

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      repro.patch ./buildscripts/resmoke.py run --storageEngine=wiredTiger --storageEngineCacheSizeGB=.50 --suite=sharding jstests/sharding/repro.js --log=file
    • Sharding EMEA 2021-12-27

    Description

      _shardsvrReshardCollection constructs a ReshardCollectionCoordinator passing as argument 'request()', which contains non-owned BSON objects (in particular, 'key' and 'collation'. ReshardCollectionCoordinator makes a copy of the ShardsvrReshardCollection object, but the mentioned BSON objects are still unowned. Thus, if ReshardCollectionCoordinator outlives the _shardsvrReshardCollection command, a crash can happen because the underlying bson objects are dangling.

      Attachments

        1. repro.patch
          1 kB
          Jordi Serra Torrens

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            jordi.serra-torrens@mongodb.com Jordi Serra Torrens
            jordi.serra-torrens@mongodb.com Jordi Serra Torrens
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            Dates

              Created:
              Updated:
              Resolved: