login success only once

[kaimi]

hi, all
     in my inittab, "tts/0::respawn:/bin/login" works well at the startup,
but in the shell, if run login manually, there's promption for user name,
after input the user name, there's no promption for password, the system is
zombie, the inittab is followed, any ideas? thanks

tts/0::respawn:/bin/login
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