[BUG] write(2) hangs in 2.2.[13-14] (fwd)

[imel...]

	hi all,

	i was testing my nbd array with:
	dd if=/dev/urandom of=test count=4000000

	on a raid5 partition. the test hangs one of the nbd client.
	the problem was on the client. doing:
	#strace nbd-server 100 /dev/hda

	showed that one of the machine was doing write() and it never
	returns.
	the hda is a 3gb disk.

	the kernel had the raid patch, but i wasn't using raid. so it
	must be the kernel. no oops.

		imel