Public bug reported:
$ uname -a
Linux zzz 2.6.32-25-generic #45-Ubuntu SMP Sat Oct 16 19:48:22 UTC 2010 i686
GNU/Linux
$ cat /proc/version_signature
Ubuntu 2.6.32-25.45-generic 2.6.32.21+drm33.7
Ubuntu version: lucid
Attempting to mount a 9p file system in a qemu guest fails
intermittently with the error message "Unable to read superblock". I
tracked this down to an uninitialized field in the virtio transport. A
patch to fix it is attached.
Note: this bug has been fixed upstream in a minor release (2.6.33)
To reproduce: you must be running qemu >= 0.13
$ qemu -virtfs local,path=/tmp,security_model=passthrough,mount_tag=tmp root.img
When the system comes up, run the following command:
# mount -t 9p -o trans=virtio,version=9p2000.L tmp /tmp
The command fails intermittently with 'unable to read superblock'.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: patch
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mounting 9p file system fails intermittently in qemu guest
https://bugs.launchpad.net/bugs/676823
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