Bug 454928

Description of problem:

kpartx errors out on files 2Gb or larger (on 32-bit) or 8Gb or larger (on 64-bit) 
with the cryptic error:

failed to stat() <filename>

Giving it the -v flag does not give any more output.

I have replicated this on Fedora 8 and 9 as well.

Version-Release number of selected component (if applicable):

kpartx-0.4.7-17.el5

How reproducible:

Every time.

Steps to Reproduce:

1. Create a file 2Gb or larger on a 32-bit system, or 8Gb or larger on a 64-bit 
system.
2. Run kpartx on it.
3. Fail!
  
Actual results:

Fails to stat:

# dd if=/dev/zero of=2g.img bs=1024M count=2
2+0 records in
2+0 records out
2147483648 bytes (2.1 GB) copied, 45.3624 seconds, 47.3 MB/s
# kpartx -l 2g.img
failed to stat() 2g.img

Expected results:

It works with files just under 2Gb:

# dd if=/dev/zero of=almost2g.img bs=1000M count=2
2+0 records in
2+0 records out
2097152000 bytes (2.1 GB) copied, 45.1009 seconds, 46.5 MB/s
# kpartx -l almost2g.img

Additional info:

The results I pasted were from a 32-bit machine.  It works exactly the same with 
a 8Gb threshold on 64-bit machines.

This really sucks, since kpartx _would be_ a great tool for working with virtual 
machines, if it worked on large files.  But we use 10 Gb files for our VMs (which 
is even smaller than a lot of people), so we can't mount them on 32- or 64-bit 
systems.

If there's a workaround we can use in the mean time, I'd appreciate that, too.

This has been reported to CentOS as well, but without any activity: http://
bugs.centos.org/view.php?id=2882