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  1. Minecraft: Java Edition
  2. MC-63

Player data and region files not written to disk simultaneously causing item duplication

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    Details

    • Type: Bug
    • Status: Reopened
    • Resolution: Unresolved
    • Affects Version/s: Minecraft 1.4.1, Snapshot 13w19a, Snapshot 13w21a, Minecraft 1.8.8, Minecraft 16w02a, Minecraft 1.9, Minecraft 1.9.1 Pre-Release 1, Minecraft 1.9.4, Minecraft 16w20a, Minecraft 1.11, Minecraft 16w50a, Minecraft 1.11.2, Minecraft 17w17a, Minecraft 17w17b, Minecraft 1.12.1, Minecraft 1.12.2, Minecraft 18w15a, Minecraft 1.13-pre1, Minecraft 1.13-pre2, Minecraft 1.13.2, 1.14.4, 1.15.2, 1.16.1
    • Fix Version/s: Minecraft 1.4.5
    • Confirmation Status:
      Confirmed
    • Category:
      Player
    • Mojang Priority:
      Normal

      Description

      The bug

      Due to player data and region files not written to disk simultaneously, items can be duplicated quite easy under certain conditions. As of 1.16, Minecraft can be configured to run in synchronous disk i/o mode, making this issue more obvious and easier to reproduce.

      How to reproduce

      1. Make sure syncChunkWrites in options.txt is set to true
      2. Create a world and fill your inventory with things
      3. Leave the world to make sure player data gets written to disk
      4. Rejoin the world
      5. Die
      6. Forcefully terminate minecraft's java process (Taskmanager, /taskkill, ...)
      7. Rejoin the world
        → Notice things you've collected now appear on the ground and in your inventory

      Video demonstrating the issue (potentially outdated regarding reproduction): https://youtu.be/0RYRj5XN8vk?t=25s

        Attachments

          Issue Links

          is duplicated by

          Bug - A problem which impairs or prevents the functions of the product. MC-16358 Item duplication bug

          • Resolved

          Bug - A problem which impairs or prevents the functions of the product. MC-19596 duplicate bonus chest

          • Resolved

          Bug - A problem which impairs or prevents the functions of the product. MC-24546 Dupe using a chest in Singleplayer

          • Resolved

          Bug - A problem which impairs or prevents the functions of the product. MC-151328 Item duplication 1.14

          • Resolved

          Bug - A problem which impairs or prevents the functions of the product. MC-154379 1.14.2 Item Dupe.

          • Resolved

          Bug - A problem which impairs or prevents the functions of the product. MC-156609 duplicating items death glitch

          • Resolved

          Bug - A problem which impairs or prevents the functions of the product. MC-158297 Dupe in 1.14.4 Involving opening one world in two instances at the same time

          • Resolved

          Bug - A problem which impairs or prevents the functions of the product. MC-158465 Inventory duplication on player death

          • Resolved

          Bug - A problem which impairs or prevents the functions of the product. MC-163997 Losing Chestplate during Power Outage

          • Resolved

          Bug - A problem which impairs or prevents the functions of the product. MC-173045 Duping on Servers

          • Resolved

          Bug - A problem which impairs or prevents the functions of the product. MC-191057 DUPE bug on single player TOO OP!! MUST PACH

          • Resolved

          Bug - A problem which impairs or prevents the functions of the product. MC-191841 Minecraft brand new dupe bug

          • Resolved

          Bug - A problem which impairs or prevents the functions of the product. MC-192430 Return Portal did not form in the Nether.

          • Resolved
          relates to

          Bug - A problem which impairs or prevents the functions of the product. MC-75330 Item duplication glitch

          • Resolved

          Bug - A problem which impairs or prevents the functions of the product. MC-409 Worlds not saving upon exit (single player)

          • Resolved

          Bug - A problem which impairs or prevents the functions of the product. MC-3728 Item Duplication Bug

          • Resolved

          Bug - A problem which impairs or prevents the functions of the product. MC-4247 putting items in chests in singleplayer, then quitly logging out will make the chest items revert to the way they were before you opened the chest, but your inventory will stay the say, thus deleting items (if done in reverse items can be duplicated)

          • Resolved

            Activity

              People

              Assignee:
              Unassigned Unassigned
              Reporter:
              marshallguy Marshall Bolwes
              Votes:
              57 Vote for this issue
              Watchers:
              34 Start watching this issue

                Dates

                Created:
                Updated:
                CHK: