[1.41] Attempting to reboot a system with at least two distinct file handles open causes the computer to hang with a ConcurrentModificationException.

Testing code:

local a = fs.open("test1", "w")
local b = fs.open("test2", "w")
os.reboot()

Resulting error:

ComputerCraft: Error running task.
java.util.ConcurrentModificationException
	at java.util.HashMap$HashIterator.nextEntry(HashMap.java:810)
	at java.util.HashMap$ValueIterator.next(HashMap.java:839)
	at dan200.computer.core.FileMount.unmount(FileMount.java:599)
	at dan200.computer.core.FileSystem.unload(FileSystem.java:399)
	at dan200.computer.core.Computer$63.execute(Computer.java:2110)
	at dan200.computer.core.ComputerThread$1$1.run(ComputerThread.java:68)
	at java.lang.Thread.run(Thread.java:679)

So thats why I always close my files… :ph34r:/>/>

I'm pretty shure that this will also happen if the computer is shut down by other means (eg. chunk unloading. If you were copying a file during that, you have two open handles.)

Copying files works on a different system so wouldn't be affected by this. I did think I fixed this, but apparently not - will be fixed for next release.