XrdSecsssID::genID(int) constructs an XrdSecEntity object:

   myID.name = (Secure || XrdOucUtils:: UserName(geteuid(), pBuff, pgSz))
             ? (char *)"nobody"  : pBuff;
   myID.grps = (Secure || XrdOucUtils::GroupName(getegid(), gBuff, pgSz))
             ? (char *)"nogroup" : gBuff;

XrdOucUtils:: UserName returns 0 on success, however XrdOucUtils::GroupName returns the length of the group name. This means on group name of length 0 ( a 'failure') the un-initialized gBuff will be saved in myID.grps. To avoid changing the behavior of XrdOucutils::GroupName solution is:

   myID.name = (Secure || XrdOucUtils:: UserName(geteuid(), pBuff, pgSz))
             ? (char *)"nobody"  : pBuff;
   myID.grps = (Secure || XrdOucUtils::GroupName(getegid(), gBuff, pgSz) == 0)
             ? (char *)"nogroup" : gBuff;

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