Bug concerning Proactive Reset

There seems to be a bug concerning _proactive reset_. This bug may be triggered in a matter of seconds when running the multi-threaded lbzip2 application on linux (32-bit).

**Command to run:**
`./drrun -reset_every_nth_bb_unit 3 -- lbzip2 -c my_file > my_file.bz2`

**Debug message:** DynamoRIO seems to believe that a client it making a raw sysenter.

> set confirm off
> add-symbol-file '/home/john/dynamorio/build/lib32/debug/libdynamorio.so' 0xb7c67bbc
> >
>
> os says: 0xb7005000-0xb7205000 prot=0x00000000
> cache says: 0xb7005000-0xb7206000 prot=0x00000000
> >
>
>
>
>