Date: Mon, 28 May 2012 02:22:33 +1000 From: Darren Reed <darrenr@freebsd.org> To: freebsd-net@freebsd.org Subject: rsh forking to infinity and beyond Message-ID: <4FC254C9.1050408@freebsd.org>
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I've run into a rather strange problem with rsh on FreeBSD 9.0
where rsh seems to become a fork bomb.
How or why this happens, I do not know. If I run it from the
command line with a shell, it behaves perfectly normal. Even
inside $() with pdksh. But when I put it in my script...
What does the problem look like? See below.
The script in question does this:
x=$(truss -o rsh.$host.tr -f ${RSH} -l root ${host} echo hello_world)
...
Normally there would be no truss, but I'm trying to work out
why this is happening. Unfortunately, truss does not reveal
any amount of nested forking.
I'm at a loss to explain what's going on.
Anyone?
Darren
-+= 00001 root /sbin/init --
|--= 00127 root adjkerntz -i
|--= 00743 root /sbin/devd
|--= 00909 root /usr/sbin/syslogd -s
|-+= 01149 root /usr/sbin/sshd
| \-+= 01255 root sshd: darrenr [priv] (sshd)
| \-+- 01258 darrenr sshd: darrenr@pts/0 (sshd)
| \-+= 01259 darrenr -tcsh (tcsh)
| \-+= 01328 root su root -c exec tcsh
| \-+= 01329 root tcsh
| |-+= 01392 root /bin/ksh ./setup.sh (ksh93)
| | \-+- 01394 root truss -o rsh.freebsd.tr -f rsh -l root freebsd ec
ho hello_world
| | |-+- 01395 root rsh -l root freebsd echo hello_world
| | | \--- 01454 root <defunct>
| | |--- 01400 root <defunct>
| | \--- 01455 root <defunct>
| \-+= 02045 root pstree
| \--- 02046 root ps -axwwo user,pid,ppid,pgid,command
|--= 01156 root sendmail: accepting connections (sendmail)
|--= 01160 smmsp sendmail: Queue runner@00:30:00 for /var/spool/clientmqueue (s
endmail)
|--= 01166 root /usr/sbin/cron -s
|--= 01191 root /usr/sbin/inetd -wW -C 60
|--= 01226 root /usr/libexec/getty Pc ttyv0
|--= 01227 root /usr/libexec/getty Pc ttyv1
|--= 01228 root /usr/libexec/getty Pc ttyv2
|--= 01229 root /usr/libexec/getty Pc ttyv3
|--= 01230 root /usr/libexec/getty Pc ttyv4
|--= 01231 root /usr/libexec/getty Pc ttyv5
|--= 01232 root /usr/libexec/getty Pc ttyv6
|--= 01233 root /usr/libexec/getty Pc ttyv7
|-+- 01397 root rsh freebsd -l root echo hello_world
| \--- 01401 root <defunct>
|-+- 01399 root rsh freebsd -l root echo hello_world
| \--- 01404 root <defunct>
|-+- 01403 root rsh freebsd -l root echo hello_world
| \--- 01407 root <defunct>
|-+- 01406 root rsh freebsd -l root echo hello_world
| \--- 01410 root <defunct>
|-+- 01409 root rsh freebsd -l root echo hello_world
| \--- 01413 root <defunct>
|-+- 01412 root rsh freebsd -l root echo hello_world
| \--- 01416 root <defunct>
|-+- 01415 root rsh freebsd -l root echo hello_world
...
|-+- 02026 root rsh freebsd -l root echo hello_world
| \--- 02030 root <defunct>
|-+- 02029 root rsh freebsd -l root echo hello_world
| \--- 02033 root <defunct>
|-+- 02032 root rsh freebsd -l root echo hello_world
| \--- 02036 root <defunct>
|-+- 02035 root rsh freebsd -l root echo hello_world
| \--- 02039 root <defunct>
\-+- 02038 root rsh freebsd -l root echo hello_world
\-+- 02040 root rsh freebsd -l root echo hello_world
\--- 02041 root rsh freebsd -l root echo hello_world
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