Re: [eAccelerator-developers] low frequency segfault on AMD64

[Ramon v. A. <ra...@hy...>]

I'm opening a new thread for this to prevent thread-hijjacking, quoting 
original message in full.

Oliver Schonrock wrote:

> We have installed 0.9.5-beta1 on an AMD64 production machine.
>
> This machine is quite busy and runs with 128MB of eA cache.
>
> FreeBSD 5.3-RELEASE FreeBSD 5.3-RELEASE #4:
> Fri May  6 14:07:48 BST 2005 amd64
>
> Apache/2.0.55 (FreeBSD)
>
> eA installed from the current 0.9.4rc_1 ports with a tweaked Makefile 
> (version number and MD5 changed, and all patches removed).
>
> PHP 5.1.2 (cli) (built: Mar  8 2006 00:09:12)
> Copyright (c) 1997-2006 The PHP Group
> Zend Engine v2.1.0, Copyright (c) 1998-2006 Zend Technologies
>     with eAccelerator v0.9.5-beta1, Copyright (c) 2004-2005 
> eAccelerator, by eAccelerator
>
> we are getting about 30 of these per day:
>
> [Thu Mar 09 17:24:01 2006] [notice] child pid 19220 exit signal 
> Segmentation fault (11)

We're getting them on both our AMD64's and our Intel-Xeon's (32bit).
Roughly 30-40 a day. Haven't tried 0.9.5_beta1 on our 32bit hosts though.

> The exact same configuration is running on a 32bit Athlon production 
> machine with no segfaults.
>
> I know this is not very helpful, because I haven't provided a trace, 
> but I don't have a way of doing that on this production machine. We 
> haven't been able to track down the script that causes the segfault 
> either, as far as we can tell it seems "random".
>
> We would like to help track this down. Are there any known issues on 
> 64bit in 0.9.5-beta1?
>
> Could this be one of those famous "concurrency isssues"?

AFAIK there's an outstanding bug that eaccelerator causes apache to 
segfault with signal 11 under load.

>
> Are there any tips anyone has on how we can narrow down the 
> problem/provide a trace given this is a production environment (we 
> don't have a 64bit dev machine)?

Any tips on producing a helpful trace to debug this would be useful, I 
can setup a host in both environments (32/64 bit) for tracing if 
neccesary. For the time being those would be on php-4.3.11 though.
We're working on an upgrade to php5.

Regards,

Ramon

-- 
mail:    ra...@hy...
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-- 
mail:    ra...@hy...
gsm:     +31 (0) 6 48261300
msn:     rja...@ho...
www:     http://ramon71.hyves.nl