Internal server error in 2.3.1 = mmap() problem?

[Eli Stair]

After Alessandro's post last week, I confirmed my issue was due to glomming the tmpfile onto a tmpfs space with all my other high-IO RRD's, etc.  To confirm his posts, moving the file back to the same local FS fixed the symptoms.

I'll build the CVS vers. this week and try it with the file back on the old filesystem, and post back.

Thanks for your response Ethan.

/eli

-----Original Message-----
From: nagios-devel-admin at lists.sourceforge.net on behalf of Ethan Galstad
Sent: Sat 5/20/2006 12:59 PM
To: Nagios-Devel
Subject: Re: [Nagios-devel] Internal server error in 2.3.1 = mmap() problem?
 
Ethan Galstad wrote:
> Aha!
> 
> I was thinking that the recent patches to CVS might solve this problem, 
> but I doubt they will.  A little detective work revealed that a SIGBUS 
> interrupt may occur if the underlying file that is mmap()ed is 
> truncated.  Since the status file is updated regularly, its size may be 
> larger or smaller than it was previously, so this could be causing the 
> SIGBUS.
> 
> Therefore I assume that I should *not* be mmap()ing the following files: 
> status, comment, and downtime.  Instead, I should be using the standard 
> fgets() calls.  Can anyone else chime in and verify my suspicion?  It 
> seems strange that more people have not reported errors, but the 
> implementation of mmap() across different systems may prevent this error 
> from occuring for others...
> 

I have just committed patches to the 2.x and HEAD branches that remove 
the mmap() functionality for reading the status, comment, and downtime 
files, as I believe this might be the cause of problems.

Alessandro and Eli - Could you test the latest CVS snapshot and see if 
the problem appears to be resolved?  You can grab the latest CVS 
snapshot at the following link:

http://nagios.sourceforge.net/download/cvs/nagios-2-x-cvs.tar.gz


Ethan Galstad,
Nagios Developer
---
Email: nagios at nagios.org
Website: http://www.nagios.org


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