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SubjectRe: Strange Error in 2.0.33 w/ RH5.0

On Wed, 18 Feb 1998, Theodore Y. Ts'o wrote:

> Date: Tue, 17 Feb 1998 15:45:28 -0600 (CST)
> From: Tom Tom Tom <>
> Warning: dev (02:01) tty->count(1) != #fd's(2) in tty_open
> Warning: dev (03:01) tty->count(2) != #fd's(3) in tty_open
> Warning: dev (03:01) tty->count(3) != #fd's(5) in tty_open
> Warning: dev (03:01) tty->count(3) != #fd's(6) in release_dev
> Are you using PPP or SLIP by any chance? Alexey Kuznetsov has recently
> pointed out a race condition in the tty hangup processing which hits if
> you are using PPP or SLIP line discplines. I'm currently considering
> how to fix this....
> Most of the time the messages seem to be harmless, and the kernel will
> recover, but it is a problem.

I'm sporadically getting these messages, too. I never noticed any problems
resulting of this:

Feb 18 12:50:34 Galois kernel: Warning: dev (03:19) tty->count(1) != #fd's(2) in do_tty_hangup

The affected machine has no PPP or SLIP logins, but many users are login
in on this machine. Every kernel since a long time seems to have this

> - Ted


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