Tried completely fresh install of fedora-11 and still the same problem,
but finally some new information.

This bug affects x86_64 ltsp clients only!   i386 clients work fine.


Mounting the memory stick works, but trying to read or write to it fails with:

    ellson@bock:usbdisk-sda1> cat foo
    cat: foo: Cannot allocate memory

I suspect this code in ltspfsd (also the similar malloc in ltspfs_write() )


void ltspfs_read(int sockfd, XDR * in)
{
    XDR out;
    char path[PATH_MAX];
    char output[LTSP_MAXBUF];
    int i;
    int fd;
    int result;
    size_t size;
    off_t offset;
    char *buf;

    if (!xdr_u_int(in, &size)) {                 /* Get the size */
        eacces(sockfd);
        return;
    }

    if (!xdr_longlong_t(in, &offset)) {          /* Get the offset */
        eacces(sockfd);
        return;
    }

    if (get_fn(sockfd, in, path)) {              /* Get the path */
        eacces(sockfd);
        return;
    }


    buf = malloc(size);

    /*
     * Check result of malloc
     */

    if (!buf) {
        status_return(sockfd, FAIL);
        return;
    }



Partularly since this code is generating these build warnings!

ake[2]: Entering directory `/home/ellson/rpmbuild/BUILD/ltspfs-0.5.8/src'
/usr/bin/gcc -DHAVE_CONFIG_H -I. -I..    -Wall -W -D_FILE_OFFSET_BITS=64 -DFUSE_USE_VERSION=22 -D_REENTRANT -g -O2 -MT ltspfs-ltspfs.o -MD -MP -MF .deps/ltspfs-ltspfs.Tpo -c -o ltspfs-ltspfs.o `test -f 'ltspfs.c' || echo './'`ltspfs.c
ltspfs.c: In function ‘ltspfs_getattr’:
ltspfs.c:312: warning: passing argument 2 of ‘xdr_u_int’ from incompatible pointer type
/usr/include/rpc/xdr.h:289: note: expected ‘u_int *’ but argument is of type ‘__nlink_t *’
ltspfs.c: In function ‘ltspfs_read’:
ltspfs.c:766: warning: passing argument 2 of ‘xdr_u_int’ from incompatible pointer type
/usr/include/rpc/xdr.h:289: note: expected ‘u_int *’ but argument is of type ‘size_t *’
ltspfs.c: In function ‘ltspfs_write’:
ltspfs.c:823: warning: passing argument 2 of ‘xdr_u_int’ from incompatible pointer type
/usr/include/rpc/xdr.h:289: note: expected ‘u_int *’ but argument is of type ‘size_t *’
ltspfs.c: In function ‘ltspfs_statfs’:
ltspfs.c:882: warning: passing argument 2 of ‘xdr_int’ from incompatible pointer type
/usr/include/rpc/xdr.h:288: note: expected ‘int *’ but argument is of type ‘long int *’
ltspfs.c:883: warning: passing argument 2 of ‘xdr_int’ from incompatible pointer type
/usr/include/rpc/xdr.h:288: note: expected ‘int *’ but argument is of type ‘long int *’
ltspfs.c:889: warning: passing argument 2 of ‘xdr_int’ from incompatible pointer type
/usr/include/rpc/xdr.h:288: note: expected ‘int *’ but argument is of type ‘long int *’
mv -f .deps/ltspfs-ltspfs.Tpo .deps/ltspfs-ltspfs.Po
/usr/bin/gcc -DHAVE_CONFIG_H -I. -I..    -Wall -W -D_FILE_OFFSET_BITS=64 -DFUSE_USE_VERSION=22 -D_REENTRANT -g -O2 -MT ltspfs-common.o -MD -MP -MF .deps/ltspfs-common.Tpo -c -o ltspfs-common.o `test -f 'common.c' || echo './'`common.c
mv -f .deps/ltspfs-common.Tpo .deps/ltspfs-common.Po
/usr/bin/gcc -Wall -W -D_FILE_OFFSET_BITS=64 -DFUSE_USE_VERSION=22 -D_REENTRANT -g -O2   -o ltspfs ltspfs-ltspfs.o ltspfs-common.o -pthread -L/lib64 -lfuse -lrt -ldl -lX11   
/usr/bin/gcc -DHAVE_CONFIG_H -I. -I..    -Wall -W -D_FILE_OFFSET_BITS=64 -DAUTOMOUNT -D_REENTRANT -g -O2 -MT ltspfsd-ltspfsd.o -MD -MP -MF .deps/ltspfsd-ltspfsd.Tpo -c -o ltspfsd-ltspfsd.o `test -f 'ltspfsd.c' || echo './'`ltspfsd.c
mv -f .deps/ltspfsd-ltspfsd.Tpo .deps/ltspfsd-ltspfsd.Po
/usr/bin/gcc -DHAVE_CONFIG_H -I. -I..    -Wall -W -D_FILE_OFFSET_BITS=64 -DAUTOMOUNT -D_REENTRANT -g -O2 -MT ltspfsd-ltspfsd_functions.o -MD -MP -MF .deps/ltspfsd-ltspfsd_functions.Tpo -c -o ltspfsd-ltspfsd_functions.o `test -f 'ltspfsd_functions.c' || echo './'`ltspfsd_functions.c
ltspfsd_functions.c: In function ‘ltspfs_getattr’:
ltspfsd_functions.c:238: warning: passing argument 2 of ‘xdr_u_int’ from incompatible pointer type
/usr/include/rpc/xdr.h:289: note: expected ‘u_int *’ but argument is of type ‘__nlink_t *’
ltspfsd_functions.c: In function ‘ltspfs_read’:
ltspfsd_functions.c:700: warning: passing argument 2 of ‘xdr_u_int’ from incompatible pointer type
/usr/include/rpc/xdr.h:289: note: expected ‘u_int *’ but argument is of type ‘size_t *’
ltspfsd_functions.c: In function ‘ltspfs_write’:
ltspfsd_functions.c:776: warning: passing argument 2 of ‘xdr_u_int’ from incompatible pointer type
/usr/include/rpc/xdr.h:289: note: expected ‘u_int *’ but argument is of type ‘size_t *’
ltspfsd_functions.c: In function ‘ltspfs_statfs’:
ltspfsd_functions.c:864: warning: passing argument 2 of ‘xdr_int’ from incompatible pointer type
/usr/include/rpc/xdr.h:288: note: expected ‘int *’ but argument is of type ‘long int *’
ltspfsd_functions.c:865: warning: passing argument 2 of ‘xdr_int’ from incompatible pointer type
/usr/include/rpc/xdr.h:288: note: expected ‘int *’ but argument is of type ‘long int *’
ltspfsd_functions.c:871: warning: passing argument 2 of ‘xdr_int’ from incompatible pointer type
/usr/include/rpc/xdr.h:288: note: expected ‘int *’ but argument is of type ‘long int *’
ltspfsd_functions.c: In function ‘handle_auth’:
ltspfsd_functions.c:950: warning: passing argument 2 of ‘xdr_u_int’ from incompatible pointer type
/usr/include/rpc/xdr.h:289: note: expected ‘u_int *’ but argument is of type ‘size_t *’
mv -f .deps/ltspfsd-ltspfsd_functions.Tpo .deps/ltspfsd-ltspfsd_functions.Po





I'd report this "upstream" but don't know where that is.  The ltsp.spec lists
https://code.launchpad.net/ltspfs, but try to report a bug there and you get:
    LtspFS (Unspecified)  does not use Launchpad as its bug tracker. 

The Launchpad pages list Scott Balneaves as the maintainer, so I'll try adding him to needinfo.