CDE exit sometimes fails (4385479)
After a user clicks the EXIT icon on the front panel to exit, the system does not return to the login screen. Instead it just hangs with a gray screen. This bug is in base Xserver (4068021, 4378762).
Workaround:
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Assume the admin role on another machine.
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In the admin role, rlogin to the hung machine.
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Find and kill the Xsun process.
$ ps -ef | grep Xsun
Xsun_proc_id
$ kill Xsun_proc_id