After installing or upgrading to ESXi 5.5 Update 3, customers performing snapshot consolidation may experience virtual machines failing with the error “Unexpected Signal: 11”.

For further details, please refer to this KB article:

Snapshot consolidation causes virtual machines running on VMware ESXi 5.5 Update 3 hosts to fail with the error: Unexpected signal: 11 (2133118)

Any updates to this information will be made in the KB article itself.