Had an issue this morning where a ESXi host had purple screened and come up with the error
PF Exception 14 in world 9763555: vmx IP 0x41800bc10c57 addr 0x0
If the dump below the error mentions E1000PollRXRing or E1000DevRx as circled in my situation, then From looking on the VMware KB site this seems to be a known issue with the GA build of ESXi 5.5.
Updating the Hosts to update 1 resolves this issue.
Source : VMware KB 2059053