Hans Petter Selasky wrote:
On Friday 09 July 2010 19:12:59 Sean Bruno wrote:
In order to come up with the most convoluted problem possible, I present
to you screen shots of a panic from a FreeBSD VM running in QEMU
emulation under RedHat's KVM infrastructure.
I presented a perfectly functional USB partition from my host machine to
the VM. Then I attempted to mount the partition from FreeBSD and it
generated the panics located here:
http://people.freebsd.org/~sbruno/usb_panic1.png
http://people.freebsd.org/~sbruno/usb_panic2.png
This is 100% reproducible. But not an emergency or anything.
It might be that there is a conflict that both the VM and the OS is accessing
/ loading drivers on the same USB device. The panic seems not directly related
to USB.
--HPS
I followed the code for a while and the cause of the panic appears to be
that ffs_vgetf() in /usr/src/sys/ufs/ffs/ffs_vfsops.c fails in one of
the several ways possible, causing in VFS_ROOT() in
/usr/src/sys/kern/vfs_mount.c to return a non-zero value and resulting
in the panic. I think the problem calls for someone with serious VFS chops.
The I/O errors from the USB device are suspicious (in that they may
cause the mount code to misbehave if they occur during its course).
-Boris
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