Public bug reported:
Binary package hint: kvm
KVM Version: 1:72+dfsg-1ubuntu6
QEMU Version: 0.9.1-5ubuntu3
Description: Ubuntu 8.10
Release: 8.10
File Data and Filename corruption occurs when coping large files to a
Virtual FAT (VFAT) drive. I noticed this when copying ISO images
between 150MB and 200MB from WindowsXP guest to the Linux host. These
ISO images would not boot. Suspecting corruption, I confirmed MD5 hash
values of guest and host copies of these ISO images were different. (In
fact, the guest OS calculated the correct hashes of the files on the
VFAT drive after copying.)
Also, filename corruption also occurred. For example, the VFAT
directory on the host contained the file "pebuilder3110a.zip". After
"exporting" files named "pebuilder.iso", "pebuilder.log", and
"pebuilder.log.iso.md5sum.txt" from the guest OS to the Linux host, the
VFAT directory contained filenames "pebuilder.iso86.zip" (having the
size of the ISO image), and "pebuilder.logmd5sum.txt" (having the size
of the pebuilder.log" file). Again, the this corruption was not
detectable from the guest OS.
Finally, I mounted the guest OS disk image using Linux loop device.
Copying the ISO files from the NTFS file system using this method was
successful. Using PuTTY's sftp also worked.
I hope this report is helpful. I can provided more information if it
would be valuable. But, this was frustratingly easy to reproduce. I am
willing to help in any way.
** Affects: kvm (Ubuntu)
Importance: Undecided
Status: New
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Corruption of File Data/Filename w/ Virtual FAT (VFAT)
https://bugs.launchpad.net/bugs/356808
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