Re: waitid breaks telnet

[Andrew Morton]

Joe Korty <kortyads@xxxxxxxxxxxxxx> wrote:
>
> [ 2nd send, this one from my home email account...]
> 
> telnet no longer works:
> 
>      # chkconfig telnet on
>      # telnet localhost
>      Trying 127.0.0.1...
>      Connected to localhost (127.0.0.1).
>      Escape character is '^]'.
>      Red Hat Enterprise Linux WS release 3 (Taroon Update 2)
>      Kernel 2.6.10-rc2 on an i686
>      Connection closed by foreign host.
> 
> A bsearch placed the bug between 2.6.9-rc1-bk[78], another
> bsearch on the changesets showed the problem is caused
> by this patch:
> 
>      roland@xxxxxxxxxx[torvalds]|ChangeSet|20040831173525|30767
>      [PATCH] waitid system call
> 
> My guess is, something about the new wait4(2) wrapper
> is causing the telnet daemon to declare success before
> its child, /bin/login, exits.

I can reproduce this on 2.6.10-rc2, but it seems to have been fixed in more
recent kernels.  However I cannot think of anything which we did which
would have fixed this.

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