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답변자가 기본적으로 참고할 내용입니다.
- 배포판(옵션)    :  REDHAT 8
- 커널버전(옵션)
  :  2.4.20-31.9smp #1 SMP
- 데몬버전(예:apache
 1.3.27) : 
- 데몬설치유형(RPM/컴파일/기타)
 : 
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안녕하세요 . 산이님.. ^^
dmesg 확인중 이런 메세지가 있는데 저의 내공으로는 뭔지 잘
모르겠네요.

trr: type mismatch for fd000000,800000 old: uncachable new: write-combining
mtrr: type mismatch for fd000000,800000 old: uncachable new: write-combining
ip_conntrack version 2.1 (8192 buckets, 65536 max) - 292 bytes per conntrack
application bug: crond(1020) has SIGCHLD set to SIG_IGN but calls wait().
(see the NOTES section of 'man 2 wait'). Workaround activated.
application bug: sendmail(1501) has SIGCHLD set to SIG_IGN but calls wait().
(see the NOTES section of 'man 2 wait'). Workaround activated.
application bug: crond(1665) has SIGCHLD set to SIG_IGN but calls wait().
(see the NOTES section of 'man 2 wait'). Workaround activated.
application bug: crond(1669) has SIGCHLD set to SIG_IGN but calls wait().
(see the NOTES section of 'man 2 wait'). Workaround activated.
application bug: crond(1689) has SIGCHLD set to SIG_IGN but calls wait().
(see the NOTES section of 'man 2 wait'). Workaround activated.
application bug: crond(1693) has SIGCHLD set to SIG_IGN but calls wait().
(see the NOTES section of 'man 2 wait'). Workaround activated.
application bug: crond(1715) has SIGCHLD set to SIG_IGN but calls wait().
(see the NOTES section of 'man 2 wait'). Workaround activated.
application bug: sendmail(1916) has SIGCHLD set to SIG_IGN but calls wait().
(see the NOTES section of 'man 2 wait'). Workaround activated.
application bug: crond(2080) has SIGCHLD set to SIG_IGN but calls wait().
(see the NOTES section of 'man 2 wait'). Workaround activated.
application bug: crond(2096) has SIGCHLD set to SIG_IGN but calls wait().
(see the NOTES section of 'man 2 wait'). Workaround activated.
application bug: crond(2100) has SIGCHLD set to SIG_IGN but calls wait().
(see the NOTES section of 'man 2 wait'). Workaround activated.


대략 맥이라도 잡아주시면 열심히 공부하겠습니다..^^