ASM 12.1.0.1.0 rm -rf datafile while database is open

In 11.2.0.3 databases we used:

asmcmd rm -rf \+fra\/$AUX_SID  in our scripts for such things as cloning and creating standby's.

This created an error in 12.1.0.1. -  ORA-00600: internal error code, arguments: [kfcDeadlockAvoid01], [3]

So we changed it to:

asmcmd rm -rf \+fra\/$AUX_SID\/ and that stopped the error.   But now it seems that we can delete datafiles when the database is online.  The prior script stopped us from doing this when the database was open.

Please help.

Thanks!