After playing fine on my new set up server with a fresh world for more than 3 hours, i just crashed while collecting Sticky Resin with the Wooden Treetap.
Edit: Forgot that at 00:00 my dedicated server is configured for automatic restart. So i guess MC crashed instead of showing a connection loss?
Crash Log (starting at the time where the first error occured):
2012-09-16 23:49:34 [INFO] [STDOUT] setupTexture: "/ic2/sprites/GUIGenerator.png", id: 257
2012-09-16 23:49:57 [INFO] [STDOUT] Error in class 'SourceLWJGL OpenAL'
2012-09-16 23:49:57 [INFO] [STDOUT] Channel null in method 'stop'
2012-09-16 23:50:40 [INFO] [STDOUT] setupTexture: "/ic2/sprites/GUIElectricBlock.png", id: 258
2012-09-16 23:52:05 [INFO] [STDOUT] Error in class 'SourceLWJGL OpenAL'
2012-09-16 23:52:05 [INFO] [STDOUT] Channel null in method 'stop'
2012-09-16 23:56:27 [INFO] [STDOUT] setupTexture: "/ic2/sprites/GUIMacerator.png", id: 259
2012-09-16 23:56:49 [INFO] [STDOUT] Error in class 'SourceLWJGL OpenAL'
2012-09-16 23:56:49 [INFO] [STDOUT] Channel null in method 'stop'
2012-09-16 23:57:09 [INFO] [STDOUT] Error in class 'SourceLWJGL OpenAL'
2012-09-16 23:57:09 [INFO] [STDOUT] Channel null in method 'stop'
2012-09-16 23:57:29 [INFO] [STDOUT] Error in class 'SourceLWJGL OpenAL'
2012-09-16 23:57:29 [INFO] [STDOUT] Channel null in method 'stop'
2012-09-16 23:57:32 [INFO] [STDOUT] Error in class 'SourceLWJGL OpenAL'
2012-09-16 23:57:32 [INFO] [STDOUT] Channel null in method 'stop'
2012-09-16 23:57:49 [INFO] [STDOUT] Error in class 'SourceLWJGL OpenAL'
2012-09-16 23:57:49 [INFO] [STDOUT] Channel null in method 'stop'
2012-09-16 23:58:09 [INFO] [STDOUT] Error in class 'SourceLWJGL OpenAL'
2012-09-16 23:58:09 [INFO] [STDOUT] Channel null in method 'stop'
2012-09-16 23:58:29 [INFO] [STDOUT] Error in class 'SourceLWJGL OpenAL'
2012-09-16 23:58:29 [INFO] [STDOUT] Channel null in method 'stop'
2012-09-16 23:58:49 [INFO] [STDOUT] Error in class 'SourceLWJGL OpenAL'
2012-09-16 23:58:49 [INFO] [STDOUT] Channel null in method 'stop'
2012-09-16 23:59:09 [INFO] [STDOUT] Error in class 'SourceLWJGL OpenAL'
2012-09-16 23:59:09 [INFO] [STDOUT] Channel null in method 'stop'
2012-09-16 23:59:29 [INFO] [STDOUT] Error in class 'SourceLWJGL OpenAL'
2012-09-16 23:59:29 [INFO] [STDOUT] Channel null in method 'stop'
2012-09-16 23:59:38 [INFO] [STDOUT] Error in class 'SourceLWJGL OpenAL'
2012-09-16 23:59:38 [INFO] [STDOUT] Channel null in method 'stop'
2012-09-17 00:00:06 [INFO] [STDERR] java.lang.NullPointerException
2012-09-17 00:00:06 [INFO] [STDERR] at ic2.common.NetworkManagerClient.initiateKeyUpdate(NetworkManagerClient.java:117)
2012-09-17 00:00:06 [INFO] [STDERR] at ic2.common.KeyboardClient.sendKeyUpdate(KeyboardClient.java:47)
2012-09-17 00:00:06 [INFO] [STDERR] at ic2.common.PlatformClient.tickStart(PlatformClient.java:437)
2012-09-17 00:00:06 [INFO] [STDERR] at cpw.mods.fml.common.SingleIntervalHandler.tickStart(SingleIntervalHandler.java:16)
2012-09-17 00:00:06 [INFO] [STDERR] at cpw.mods.fml.common.FMLCommonHandler.tickStart(FMLCommonHandler.java:107)
2012-09-17 00:00:06 [INFO] [STDERR] at cpw.mods.fml.common.FMLCommonHandler.onPreClientTick(FMLCommonHandler.java:363)
2012-09-17 00:00:06 [INFO] [STDERR] at net.minecraft.client.Minecraft.l(Minecraft.java:1432)
2012-09-17 00:00:06 [INFO] [STDERR] at net.minecraft.client.Minecraft.J(Minecraft.java:834)
2012-09-17 00:00:06 [INFO] [STDERR] at net.minecraft.client.Minecraft.run(Minecraft.java:764)
2012-09-17 00:00:06 [INFO] [STDERR] at java.lang.Thread.run(Unknown Source)
2012-09-17 00:00:16 [INFO] [STDOUT] Stopping!
2012-09-17 00:00:16 [INFO] [STDOUT] SoundSystem shutting down...
2012-09-17 00:00:16 [INFO] [STDOUT] Author: Paul Lamb, www.paulscode.com2012-09-17 00:00:50 [INFO] [STDERR] Someone is closing me!
This is definitely not right. Either minecraft or the multiplayer connection are null.
If this only happens when your server restarts, I don't really consider it a critical bug. As Richard said (probably before your edit), the issue most likely is the connection reference being null (because your server terminated said connection during restart).
Not supposed to crash like that, but it's nothing serious, I guess.
