Date: Fri, 11 Oct 1996 13:47:55 -0400 (EDT) From: "Stuart R. Anderson" <anderson@hawaii.conterra.com> To: FreeBSD-gnats-submit@freebsd.org Subject: bin/1774: telnet hangup bug Message-ID: <199610111747.NAA08025@hawaii.conterra.com> Resent-Message-ID: <199610111800.LAA14661@freefall.freebsd.org>
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>Number: 1774
>Category: bin
>Synopsis: telnet spins when killed before network is closed
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: freebsd-bugs
>State: open
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Fri Oct 11 11:00:02 PDT 1996
>Last-Modified:
>Originator: Stuart R. Anderson
>Organization:
Stuart Anderson anderson@conterra.com
Conterra Communications
>Release: FreeBSD 2.1-STABLE i386
>Environment:
Main server runnning ISP business. Pentium/166.
>Description:
telnet can go into a run-bound loop if it is killed during the shutdown
process. telnet keeps going into deadpeer().
>How-To-Repeat:
We are using pmwho (a portmaster related utility) to create a web
page displaying who is logged in. Pmwho uses telnet to communicate
with the Portmaster. When pmwho exits, telnet receives a signal which
begins the looping.
During the last incident, we managed to get a load avarage of 100+.
>Fix:
Reset the signal handler to avoid the loop. There is probably one or
two other places where this could be placed, but this one works for us.
diff -c sys_bsd.c.orig sys_bsd.c
*** sys_bsd.c.orig Fri Oct 11 13:33:49 1996
--- sys_bsd.c Fri Oct 11 13:33:59 1996
***************
*** 789,794 ****
--- 789,795 ----
NetClose(fd)
int fd;
{
+ (void) signal(SIGPIPE, SIG_DFL);
return close(fd);
}
>Audit-Trail:
>Unformatted:
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