After inserting a huge file via GridFS (500MB) and dropping the database after, it is impossible to create a new collection in the database. the command fails with the following error:
"errmsg" : "exception: assertion util/mmap.cpp:167"

Here ist the full shell copy:

MongoDB shell version: 1.8.0
connecting to: db.qa.ep2.hypoport.local:27001/test
ep2:PRIMARY> use test
switched to db test
ep2:PRIMARY> db.createCollection("foo")
{
"errmsg" : "exception: assertion util/mmap.cpp:167",
"code" : 0,
"ok" : 0
}