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.git/config corruption using 9p virtio in guest

DISCUSSION Darren Hart 2 participants 2 messages Nov 5, 2011 – Nov 7, 2011 KVM

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Darren Hart

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I have a 32b Fedora 15 guest mounting a filesystem from an Ubuntu 11.10 64b host using virtio and 9p. I'm using the "mapping" security mode (tried squash as well). While I can create, edit, and delete files, when I try to create or clone a git repository, I end up with garbage for the first bit of the newly created .git config.

$ kvm --version
QEMU emulator version 0.14.1 (qemu-kvm-0.14.1), Copyright (c) 2003-2008
Fabrice Bellard
$ uname -a
Linux rage 3.0.0-12-server #20-Ubuntu SMP Fri Oct 7 16:36:30 UTC 2011
x86_64 x86_64 x86_64 GNU/Linux
$ virt-manager --version
Gtk-Message: Failed to load module "pk-gtk-module"
Gtk-Message: Failed to load module "canberra-gtk-module"
0.9.0

The underlying filesystem on the host is an md RAID0 array mounted as:
/dev/md0 on /build type ext4 (rw,noatime,nodiratime,commit=6000)

I was hoping to use 9p/virtio to avoid having to generate a number of larger vm images which I'm using to build full OSes. I'd like the resulting images to be easily accessible on the host.

Any thoughts on a solution?

Signature · 3 lines
Darren Hart
Intel Open Source Technology Center
Yocto Project - Linux Kernel
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Quoted 19 lines · Darren Hart

I have a 32b Fedora 15 guest mounting a filesystem from an Ubuntu 11.10 64b host using virtio and 9p. I'm using the "mapping" security mode (tried squash as well). While I can create, edit, and delete files, when I try to create or clone a git repository, I end up with garbage for the first bit of the newly created .git config.

$ kvm --version
QEMU emulator version 0.14.1 (qemu-kvm-0.14.1), Copyright (c) 2003-2008
Fabrice Bellard
$ uname -a
Linux rage 3.0.0-12-server #20-Ubuntu SMP Fri Oct 7 16:36:30 UTC 2011
x86_64 x86_64 x86_64 GNU/Linux
$ virt-manager --version
Gtk-Message: Failed to load module "pk-gtk-module"
Gtk-Message: Failed to load module "canberra-gtk-module"
0.9.0
Quoted 8 lines

The underlying filesystem on the host is an md RAID0 array mounted as:
/dev/md0 on /build type ext4 (rw,noatime,nodiratime,commit=6000)

I was hoping to use 9p/virtio to avoid having to generate a number of larger vm images which I'm using to build full OSes. I'd like the resulting images to be easily accessible on the host.

Any thoughts on a solution?

Can you describe the corrupted .git/config in more detail?

Does git give you an error message?

Can you hexdump or post the file contents - often corrupted files contain a clue as to how the corruption occurred?

CCed Aneesh, QEMU virtfs maintainer.

Stefan