Strange message: Text file busy.

[nj18]

   On FreeBSD 5.4:
   > uname -a
   FreeBSD phoenix.domain 5.4-STABLE FreeBSD 5.4-STABLE #0: Sun Jul 10
   18:54:13 EDT 2005
   [1]root at phoenix.domain:/usr/obj/usr/src/sys/GENERIC  i386
   > echo date >somescript
   > chmod +x somescript
   > ./somescript
   ./somescript: Text file busy.
   What does mean this message at the end: "Text file busy."? I thought
   its a bug in tcsh, but I have this message again with sh. However, I
   can run this script with command "sh somescript":
   > sh somescript
   Thu Jul 14 15:24:28 EDT 2005
   I cant run "./somescript" on other terminal even as root. However if I
   log out and than login again I can run it:
   > ./somescript
   Thu Jul 14 15:27:06 EDT 2005
   On FreeBSD 4.6 everything is ok:
   > echo date >somescript
   > chmod +x somescript
   > ./somescript
   Thu Jul 14 15:14:05 EDT 2005
   > uname -a
   FreeBSD m-net.arbornet.org 4.6.2-RELEASE-p26 FreeBSD 4.6.2-RELEASE-p26
   #7: Sun Oct  5 00:39:40 EDT 2003
   [2]styles at m-net.arbornet.org:/source/stable/src/sys/compile/MNET  i386
   > sh somescript
   Thu Jul 14 15:24:37 EDT 2005
   >
   What is this? Is it a bug in FreeBSD 5.4? And if it is a bug how can I
   fix it?

References

   1. mailto:root at phoenix.domain:/usr/obj/usr/src/sys/GENERIC
   2. mailto:styles at m-net.arbornet.org:/source/stable/src/sys/compile/MNET