PROBLEM: loopback mount doesn't work with files on shm filesystem

[Jonathan Picht <jonathan.picht@web.de>]

Hello,

if I try to mount a file which resides on shm with '-o loop',
I get this output:

ioctl: LOOP_SET_FD: Invalid argument

cat /proc/version:
Linux version 2.4.7 (root@lithium) (gcc version 2.95.4 20010703 (Debian prerelease)) #1 Sam Jul 21 19:23:47 CEST 2001

sh scripts/ver_linux:
If some fields are empty or look unusual you may have an old version.
Compare to the current minimal requirements in Documentation/Changes.

Linux lithium 2.4.7 #1 Sam Jul 21 19:23:47 CEST 2001 i686 unknown

Gnu C                  2.95.4
Gnu make               3.79.1
binutils               2.11.90.0.24
util-linux             2.11g
mount                  2.11g
modutils               2.4.6
e2fsprogs              1.22
reiserfsprogs          3.x.0j
PPP                    2.4.1
Linux C Library        2.2.3
Dynamic linker (ldd)   2.2.3
Procps                 2.0.7
Net-tools              1.60
Console-tools          0.2.3
Sh-utils               2.0.11
Modules Loaded

I'm running Debian/unstable on a Athlon 600 with 192MB ram.
If you need more information, don't hesitate to ask.

Thank you,

Jonathan

ps: Please cc to me in replies, since I'm not subscribed to the list.