I've just run into this issue. Having checked out and built the latest e2fsprogs from git, I get the same error:
colin@myth:~/Programs/e2$ sudo ./e2fsck/e2fsck /dev/sdb1
e2fsck 1.42-WIP (02-Jul-2011)
./e2fsck/e2fsck: Device or resource busy while trying to open /dev/sdb1
Filesystem mounted or opened exclusively by another program?
I've just run into this issue. Having checked out and built the latest e2fsprogs from git, I get the same error:
colin@myth: ~/Programs/ e2$ sudo ./e2fsck/e2fsck /dev/sdb1
e2fsck 1.42-WIP (02-Jul-2011)
./e2fsck/e2fsck: Device or resource busy while trying to open /dev/sdb1
Filesystem mounted or opened exclusively by another program?
So, not <em>entirely</em> fixed upstream :/