bin/152525: ntpd on 8.1 loops on select() with EBADF

[pluknet]

>Number:         152525
>Category:       bin
>Synopsis:       ntpd on 8.1 loops on select() with EBADF
>Confidential:   no
>Severity:       serious
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Tue Nov 23 11:10:07 UTC 2010
>Closed-Date:
>Last-Modified:
>Originator:     pluknet
>Release:        8.1-RELEASE-p1 amd64
>Organization:
>Environment:
FreeBSD host 8.1-RELEASE-p1 FreeBSD 8.1-RELEASE-p1 #4: Thu Sep 23 08:30:18 UTC 2010     root at host:/usr/obj/usr/src/sys/YYY amd64
>Description:
This is repeatedly observed many times.

 2581 root             1 118    0 11736K  3532K CPU6    6  60.7H 100.00% ntpd

# ntpq -p
localhost: timed out, nothing received
***Request timed out

`/etc/rc.d/ntpd restart` make it work. What can be the reason ?

  2581 ntpd     CALL  select(0x420,0x7fffffffec20,0,0,0)
  2581 ntpd     RET   select -1 errno 9 Bad file descriptor
  2581 ntpd     CALL  stat(0x7fffffffe100,0x7fffffffe080)
  2581 ntpd     NAMI  "/usr/share/nls/C/libc.cat"
  2581 ntpd     RET   stat -1 errno 2 No such file or directory
  2581 ntpd     CALL  stat(0x7fffffffe100,0x7fffffffe080)
  2581 ntpd     NAMI  "/usr/share/nls/libc/C"
  2581 ntpd     RET   stat -1 errno 2 No such file or directory
  2581 ntpd     CALL  stat(0x7fffffffe100,0x7fffffffe080)
  2581 ntpd     NAMI  "/usr/local/share/nls/C/libc.cat"
  2581 ntpd     RET   stat -1 errno 2 No such file or directory
  2581 ntpd     CALL  stat(0x7fffffffe100,0x7fffffffe080)
  2581 ntpd     NAMI  "/usr/local/share/nls/libc/C"
  2581 ntpd     RET   stat -1 errno 2 No such file or directory
  2581 ntpd     CALL  clock_gettime(0xd,0x7fffffffd7e0)
  2581 ntpd     RET   clock_gettime 0
  2581 ntpd     CALL  getpid
  2581 ntpd     RET   getpid 2581/0xa15
  2581 ntpd     CALL  sendto(0x3,0x7fffffffd870,0x43,0,0,0)
  2581 ntpd     GIO   fd 3 wrote 67 bytes
       "<99>Nov 17 18:14:17 ntpd[2581]: select() error: Bad file descriptor"
  2581 ntpd     RET   sendto 67/0x43

>How-To-Repeat:
Wait several day until ntpd starts to loop in select().
>Fix:
`/etc/rc.d/ntpd restart` make it work.

>Release-Note:
>Audit-Trail:
>Unformatted: