Hanging cron.daily

["BeerBong" <alexei@samara.net>]

Hello all!

Please help to understand where can be a problem.
I had a following process list at the morning.
Such things happened from time to time.
----------------------------------------------------------------------------
22799 ?        SW     0:00  \_ /USR/SBIN/CRON
22801 ?        S      0:00      \_ /bin/sh -c test -e /usr/sbin/anacron ||
run-parts --report /etc/cron.daily 2>&1 | mail -s "[Log]"
22808 ?        S      0:00          \_ run-parts --report /etc/cron.daily
23051 ?        Z      0:00          |   \_ [exim <defunct>]
22809 ?        S      0:00          \_ mail -s [Log] Daily report from Maul
email@mail.ru
----------------------------------------------------------------------------
/etc/crontab:
----------------------------------------------------------------------------
SHELL=/bin/sh
PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin

 # m h dom mon dow user  command
00 9    * * *   root    test -e /usr/sbin/anacron || run-parts --report
/etc/cron.daily 2>&1 | mail -s "[Log] Daily report from Maul" email@mail.ru
----------------------------------------------------------------------------

cron.daily contains following scripts:
----------------------------------------------------------------------------
maul:/etc/cron.daily# ls
backup  calendar  exim  find  logrotate  logrotate-webalizer  man-db
modutils  netbase  proftpd  quota  samba  standard  sysklogd
----------------------------------------------------------------------------

non-standart scripts -
backup - makes incremental backup  (166 serious web sites)
(20Mb of gziped changes daily) and copy archive to another computer via
samba

I think other scripts does not matter, because they should be executed after
exim.
exim is a standart script:
----------------------------------------------------------------------------
maul:/tmp/test# cat /etc/cron.daily/exim
#!/bin/sh

# Cycle logs
if [ -x /usr/bin/savelog ]; then
  for i in mainlog rejectlog paniclog; do
    if [ -e /var/log/exim/$i ]; then
      savelog -u mail -g mail -p -c 10 /var/log/exim/$i >/dev/null
    fi
  done
fi
----------------------------------------------------------------------------
Machine has all neccessary resources:
----------------------------------------------------------------------------
maul:/usr/backup# df -k
Filesystem           1k-blocks      Used Available Use% Mounted on
/dev/sda1                93309     31955     56537  36% /
/dev/sda5               577096    155436    392344  28% /var
/dev/sda6              7850996   5840544   1611640  78% /usr
maul:/usr/backup# free
             total       used       free     shared    buffers     cached
Mem:        255900     253796       2104          0      14200      91592
-/+ buffers/cache:     148004     107896
Swap:       511132     102488     408644
----------------------------------------------------------------------------
Logs are clean.
When I start exim script manually it executes normally.
Where problem ?
---
Sergey "BeerBong" Polyakov
chief of WebZavod (http://www.webzavod.ru)