Terminated CIFS on Node1 as well as in the partner context Stopped all vfilers cf giveback showed the same message ("vfiler_low_level", 110 of 158 modules) This time though the filer completed the giveback successfully Restarted both CIFS and VFILERS Attempted new takeover for testing Disabled just the CIFS and VFIler in partner context and attempting giveback Giveback successful Did a takeover from Node2 this time Takeover successful Attempting giveback without shutting down CIFS or vfilers Node2 is showing the same message ("vfiler_low_level", 110 of 158 modules) Giveback took over 30 minutes but did complete Takeover from Node1 again Terminated CIFS and Vfilers in partner context giveback has hung again
We currently do not appear to have any public KBs specifically for ontap 8 7-mode relating to this panic.
Based on other panics we have seen with the same message this panic, I can see this panic has different known causes that could be identified with the core file analysis of the core file that would be dumped with this panic.
There are some very old bugs with a race condition with tearing down the vfiler too soon on the up node and rebuilding it on the node that was given back with CIFS workload. As @tgdfgvadfgadfadfaf mentioned, this will require the CORE dump to be analyzed to look at the stack trace during the PANIC to concretely identify the cause. Unfortunately, ONTAP 8.1.x is End of Support therefore if possible to upgrade to ONTAP 8.2.5P5. Without looking at the stack trace we also won't be able to link an exact bug or KB.