As noted in the upstream report, this is a working repro: groupadd delme useradd x1 useradd x2 useradd x3 groupmod -U x1,x2,x3 delme groupmod -U x1,x2 delme
- Bug#1122913: passwd: groupmod -U "" groupname... Chris Hofstädtler
- Bug#1122913: passwd: groupmod -U "" grou... Chris Hofstaedtler

