I'm able to reproduce the issue systematically in a KVM vm so I ran the following tests :
Kernel
3.2.0-31-virtual HANG
3.2.0-29-virtual OK
3.2.28-030228-generic HANG (this is the mainline kernel corresponding to 3.2.0-31-virtual I think)
3.5.0-17-generic OK (Quantal latest)
So looks like the issue is not seen in Quantal but do happen with the mainline kernel.
One important thing is that running 3.2.0-29-virtual DOES WORKAROUND this issue !
@Joe
I'm able to reproduce the issue systematically in a KVM vm so I ran the following tests :
Kernel 030228- generic HANG (this is the mainline kernel corresponding to 3.2.0-31-virtual I think)
3.2.0-31-virtual HANG
3.2.0-29-virtual OK
3.2.28-
3.5.0-17-generic OK (Quantal latest)
So looks like the issue is not seen in Quantal but do happen with the mainline kernel.
One important thing is that running 3.2.0-29-virtual DOES WORKAROUND this issue !