Date: Fri, 21 Aug 1998 21:30:01 -0700 (PDT) From: Bruce Evans <bde@zeta.org.au> To: freebsd-bugs@FreeBSD.ORG Subject: Re: kern/7658: (1) rlogin from some host to the FreeBSD host with very slow link. (ping reports around 200ms - 500ms delay) Message-ID: <199808220430.VAA11880@freefall.freebsd.org>
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The following reply was made to PR kern/7658; it has been noted by GNATS.
From: Bruce Evans <bde@zeta.org.au>
To: bde@zeta.org.au, freebsd-bugs@freebsd.org, yasu@codec.mrit.mei.co.jp
Cc: FreeBSD-gnats-submit@freebsd.org
Subject: Re: kern/7658: (1) rlogin from some host to the FreeBSD host with very slow link. (ping reports around 200ms - 500ms delay)
Date: Sat, 22 Aug 1998 14:20:51 +1000
>The following procedure still cause to hung terminal:
> > (1) rlogin from some host to the FreeBSD host with very slow link.
> > (ping reports around 200ms - 500ms delay)
> > (2') type ^C several times. (At this point the terminal stops to accept
> > any keys.)
>
>I did not mentioned but I rlogined 3 times.
> rlogin rlogin rlogin
>Host A ----> Host B -----------------> Host C -----> Host D
>FreeBSD SunOS slow link Solaris FreeBSD
>
>After I rlogined from Host A to Host D, if I type ^C several times,
>then terminal seems to become frozen.
I created a slow link using kernel pppd at 1200 bps, and couldn't see
any problem for:
rlogin rlogin rlogin
Host A ----> Host B -----------------> Host A -----> Host B
FreeBSD FreeBSD slow link FreeBSD FreeBSD
The panic may have been caused by the following events:
hangup -> revoked pty -> pty's vnodes lose their mount point ->
kernel bug for fsync on vnodes with no mount point.
FreeBSD returns -1/EIO for reading from revoked ptys instead of the
more normal 0/no error. Some broken applications spin reading -1/EIO.
This may look like a hang.
Bruce
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