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Re: A possible hang bug in Telnet

From: Simon Josefsson
Subject: Re: A possible hang bug in Telnet
Date: Mon, 07 Jun 2021 11:54:12 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/26.1 (gnu/linux)

Meng Ruijie <ruijie_meng@u.nus.edu> writes:

> Dear Sir/Madam,
> Sorry to bother you. During testing the Inetutils telnet, I found a
> likely hang bug. Hope you could have a check.
> After telnet is connected with a telnet server, a telnet server is
> crashed, and then telnet will be blocked forever. The reason seems
> that the function select() in sys_bsd.c doesn't consider the condition
> of unlikely receiving data from the server. It isn't set a timeout and
> always waits for data coming.

Hi.  Thanks for the report.  Is your bug in telnet or telnetd?  If it is
the telnet client, doesn't ctrl-] work in this situation, to allow you
to quit or re-open the connection?

Generally, please describe what operating system and environment you
installed Inetutils on, and the exact sequence of steps required for us
to be able to reproduce the problem.


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