I am running a 100% vanilla 1.5.1 server. I get - as soon as someone joins - tons of these here:
java.io.IOException: Input/output error
at java.io.RandomAccessFile.write(Native Method)
at java.io.RandomAccessFile.writeInt(Unknown Source)
at acg.a(SourceFile:307)
at acg.a(SourceFile:249)
at ach.close(SourceFile:230)
at java.util.zip.DeflaterOutputStream.close(Unknown Source)
at java.io.FilterOutputStream.close(Unknown Source)
at acj.a(SourceFile:137)
at acj.c(SourceFile:125)
at akv.b(SourceFile:29)
at akv.run(SourceFile:22)
at java.lang.Thread.run(Unknown Source)
There is enough space on the harddisk, so that cannot be the issue. Any idea what could be wrong?