Bug 161327

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Description of problem:
sshd waits in select (/proc/*/wchan is _stext) after the child process is 
terminated.



Version-Release number of selected component (if applicable):
kernel-2.6.11-1.1369_FC4

How reproducible:
Sometimes

Steps to Reproduce:
1. From another (client) computer, ssh server
2. exit bash
3.
  

Actual Results:  In terminal window on client computer, the ssh command does not terminate:
[serveruser@serverPC serverdir] $ exit
Logout
(cursor bliknks here)

Expected Results:  In terminal window on client computer, the ssh command terminates and the client 
computer shell prompts for the nest command:
[serveruser@serverPC serverdir] $ exit
Logout
Connection to server closed.
[localuser@clientPC localdir] $ (cursor blinks here)

Additional info:

On the server, ps shows
  user 8383 ... sshd: user@notty
and there is no child process. Observe that ordinarily the command line shows 
"sshd user@pts/1" or similar.

strace -p 8383 shows
  select(9, [3 5 8], [], NULL, NULL <unfinished ...>
lsof -p 8383 shows
  sshd 8383 user 3u  IPv6     977353    TCP serverPC:ssh->clientPC:49997 
(ESTABLISHED)
  sshd 8383 user 4u  unix 0xca6ee2a0 977411 socket
  sshd 8383 user 5r  FIFO        0,5 977419 pipe
  sshd 8383 user 6w  FIFO        0,5 977419 pipe
  sshd 8383 user 8u   CHR        5,2    680 /dev/ptmx

Observe that before terminating bash, there are file descriptors 7,8,&9
all pointing to the same file as 8 above, CHR 5,2 /dev/ptmx.

"ps -ef | grep pts/" shows no other ptys than pts/1, used by a second ssh login; 
however, "cat /proc/sys/pty/nr" shows 4.