MailScanner lock up Problem

[Steve Freegard]

Hi Richard,

Richard Potter wrote:
> On Fri, Sep 07, 2007 at 03:33:34PM +0100, Steve Freegard wrote:
> 
>> Also - make sure that 'nscd' isn't running as that's caused me no end of 
>> trouble in the past with similar symptoms.
> 
> Care to expand on that Steve? I have never been aware of any problems
> with nscd.

Sure - the nscd supplied with RedHat EL3/4 for a while was rather buggy 
(they might have fixed it now though - I'm not sure) when under heavy 
load.

As nscd is 'hooked' into glibc at a low-level (e.g. intercepting all 
getpwnam, gethostbyname et al. calls) when it fails it fails in a big 
way and causes lots of things to block waiting on the nscd socket (e.g. 
ls etc.) and the only way I found to fix is a reboot as the system gets 
too hosed to be able to do anything else.

Kind regards,
Steve.