The crashes are resolved through a defect found and fixed during the development of NOS 7.4.0. Because it was found and fixed during development, it is not listed in NOS 7.4.0 release notes. After the crashes were found to happen in versions as early as NOS 5.0.1a, the fix was ported in NOS 7.2.0d and documented in NOS 7.2.0d release notes as Parent Defect ID: NOS-67402, Issue ID: NOS-67403. No further patch releases of NOS 7.3.0 are planned. If a user encounters "Daemon nsm terminated" crashes when using non-ASCII Unicode distributed switch names in vCenter, upgrading to NOS 7.2.0d or 7.4.0 or later should prevent the crashes.
However, the maximum length of port profile names does not change in NOS 7.2.0d or 7.4.0. It is still the same 128 characters. Even after upgrading to NOS 7.2.0d or 7.4.0, if non-ASCII Unicode is used in vCenter for dswitch names, the string that vCenter passes to the VCS may be longer than NOS can handle. It is possible that the VCS won't fully recognize it. Even though vCenter allows non-ASCII Unicode for distributed switch names, only ASCII should be used.
As both a workaround and as the safest permanent solution, only ASCII letters, numbers, and unconvertible symbols should be used in vCenter distributed switch names. Letters, numbers, the minus sign "-", and the underbar "_" have been confirmed to be not converted into at-mark encoding by vCenter.