i found this thread while i was searching for a similiar Problem.
In Our case is also a Sles 11 SP3 (up to date patched) affected.
We are running a Vsphere 5.5 (patches up to date) but we are NOT using veeam, we use a different Product (i am not sure if saying which one is here allowed).
Most vesphere Backup solutions rely on VDDK so the process is mostly the same, that means to me, it is somehow a Sles (kernel) + Vsphere VM Tools Problem (probably VDDK related).
We activated vmtools debug log unfortunatly it is not telling usefull informations (while the vm dies) The only thing that i can guess off is, that the related Sles VM has an Sybase DB running wich Sqlanywhere performs some scheduled DB Jobs.
Every Time the VM dies while performing the backup, these jobs are running, so it looks like an overload on the VM (just a guess)
We are still searching for a solution