[MC-13016] Player selector (@p, @r, @a) sometimes selects wrong player

Please keep this bug report private because it contains many usernames and their positions on my live survival server. I appreciate it.

The problem I'm seeing is that command blocks are selecting players even though they do not qualify for selection. I noticed this with any command block player selector like @p.

In the case of @p, often the command block would pick a player in a vastly different location, even though the player who invoked the command was right next to the command block.

I think the problem may be related to server lag.

I also tested a series of multiple command blocks with limits, but a remote player was still selected. For example, I had one command block that would trigger a second command block.

Block #1:

testfor @a[r=256]

Block #2:

tp @p[r=256] ~0 ~0 ~0

All this does is teleport the player nowhere, but it also creates a log entry.

The trigger for Block #1 is a redstone/hopper clock on a very long delay of many minutes. This circuit is at spawn, which is situated at x: -921, z: -125.

Often, it would select players in completely different regions. Here is what the log recorded:

2013-03-26 23:54:02 [INFO] [@: Teleported imadeyoupee to -923.54,45.00,-125.69]
2013-03-27 04:09:31 [INFO] [@: Teleported HardAsBedrock to -906.33,60.54,-218.70]
2013-03-27 04:18:09 [INFO] [@: Teleported crimeminer to -900.38,40.09,-215.59]
2013-03-27 04:44:02 [INFO] [@: Teleported johnsmith626 to -918.00,6.00,-127.00]
2013-03-27 05:05:31 [INFO] [@: Teleported johndoz to -921.60,24.58,-129.43]
2013-03-27 05:31:28 [INFO] [@: Teleported Bicolore to 82599.00,78.00,39490.76]
2013-03-27 05:54:37 [INFO] [@: Teleported Sebbomm to -920.20,6.00,-125.32]
2013-03-27 06:49:30 [INFO] [@: Teleported Agardor to -802.38,11.00,107.29]
2013-03-27 07:02:35 [INFO] [@: Teleported Onenmaru to -857.01,29.25,-36.28]
2013-03-27 08:04:28 [INFO] [@: Teleported Quiqk to 504552.85,81.00,503538.47]
2013-03-28 02:41:03 [INFO] [@: Teleported wycfa2 to -63309.06,63.00,-17961.81]
2013-03-28 05:04:04 [INFO] [@: Teleported xElfy_samax to 504524.88,86.17,503533.42]
2013-03-28 06:16:55 [INFO] [@: Teleported KRAZYKAJUNKID to -923.71,45.00,-124.72]
2013-03-28 06:29:57 [INFO] [@: Teleported wycfa2 to -63329.53,11.00,-17916.78]
2013-03-28 08:18:34 [INFO] [@: Teleported yagmurkarabulut to -921.69,6.00,-125.21]
2013-03-28 08:31:22 [INFO] [@: Teleported superchoco011 to -763.73,65.39,43.77]
2013-03-28 08:39:53 [INFO] [@: Teleported PaulTB to -804.12,34.00,98.48]
2013-03-28 10:44:56 [INFO] [@: Teleported RareHunterKaze to -925.84,60.63,-123.62]
2013-03-28 11:08:20 [INFO] [@: Teleported Niglar to -917.50,45.00,-132.50]
2013-03-28 11:56:01 [INFO] [@: Teleported PaulTB to -914.79,11.00,1.02]
2013-03-28 13:34:39 [INFO] [@: Teleported Slester95 to -920.64,62.72,-118.47]
2013-03-28 13:55:59 [INFO] [@: Teleported jn3579 to -921.45,31.04,-129.66]
2013-03-28 16:12:31 [INFO] [@: Teleported firemage1999 to -920.94,6.00,-129.43]
2013-03-28 16:29:39 [INFO] [@: Teleported judson2013 to -1155.73,62.41,-88.64]
2013-03-28 17:20:59 [INFO] [@: Teleported mater341 to -919.50,45.00,-124.50]
2013-03-28 17:43:39 [INFO] [@: Teleported Napisdog to -920.38,6.00,-126.08]
2013-03-28 18:13:56 [INFO] [@: Teleported Zoomy1780 to -918.59,53.23,-132.43]
2013-03-28 20:06:02 [INFO] [@: Teleported battleman234 to -919.41,6.00,-128.78]
2013-03-28 20:28:56 [INFO] [@: Teleported xIrishSistersx to -1500841.70,47.00,1499980.43]
2013-03-28 21:55:56 [INFO] [@: Teleported Joey_Divanni to 15619.69,59.00,80248.55]
2013-03-28 22:13:14 [INFO] [@: Teleported RickDeckard525 to -923.73,45.00,-126.30]
2013-03-28 22:21:55 [INFO] [@: Teleported WowILoveLife to -921.30,37.43,-129.70]
2013-03-28 23:10:29 [INFO] [@: Teleported kaidenme to -917.30,6.00,-127.43]
2013-03-29 00:03:56 [INFO] [@: Teleported reivax3685 to -939.42,62.36,-169.49]
2013-03-29 01:38:01 [INFO] [@: Teleported stavvvv to -782.44,63.39,19.06]
2013-03-29 03:08:07 [INFO] [@: Teleported tonei39 to -921.39,45.00,-125.70]
2013-03-29 03:53:34 [INFO] [@: Teleported celtic4003mine to -763.21,53.00,77.72]
2013-03-29 04:19:55 [INFO] [@: Teleported Niksu1313 to -919.43,6.00,-128.68]
2013-03-29 04:58:33 [INFO] [@: Teleported mizbiz to -921.62,45.00,-125.59]
2013-03-29 05:11:21 [INFO] [@: Teleported iGregory67 to -84858.99,72.00,99266.80]
2013-03-29 05:24:09 [INFO] [@: Teleported iGregory67 to -84859.83,72.00,99269.07]
2013-03-29 06:02:33 [INFO] [@: Teleported D_Man_Crafter to -921.90,60.39,-126.31]
2013-03-29 06:15:21 [INFO] [@: Teleported JoelA3 to -923.66,45.00,-125.83]
2013-03-29 07:15:22 [INFO] [@: Teleported PaulTB to -800.54,11.00,102.54]
2013-03-29 07:41:02 [INFO] [@: Teleported drgon122 to -840.11,62.36,-324.49]
2013-03-29 08:10:56 [INFO] [@: Teleported pepperpot9 to -1025.19,62.39,-71.96]
2013-03-29 08:32:25 [INFO] [@: Teleported ropen908 to -917.57,59.91,-125.30]
2013-03-29 11:48:19 [INFO] [@: Teleported goldnassassin12 to -920.16,45.00,-123.55]
2013-03-29 17:05:43 [INFO] [@: Teleported SXvenom to -921.49,45.00,-125.70]
2013-03-29 17:40:15 [INFO] [@: Teleported Slowride1 to -920.31,6.00,-126.33]
2013-03-29 20:21:34 [INFO] [@: Teleported Starlight_Lily to -90760.70,63.00,10608.39]
2013-03-29 21:30:41 [INFO] [@: Teleported moondarkx to -931.63,62.36,-120.82]
2013-03-29 21:48:35 [INFO] [@: Teleported mater341 to -903.10,62.19,-230.23]
2013-03-29 22:31:18 [INFO] [@: Teleported Bicolore to 82764.70,9.00,39241.70]