Kernel: trap divide error

Server NGINX
1

Hello,

I use NginX 0.6.32-1 (the Debian sid package, recompiled for Debian
Etch) in a 64bit environnement (about 25M hits per day, per server).
NginX is used to serve static contents, and send other queries to an
Apache server.

I have a lot of errors like this in my logs :
Aug 24 01:48:13 fa20 kernel: nginx[10825] trap divide error ip:43bce1
sp:7fff4cd38160 error:0 in nginx[400000+6c000]
Aug 24 01:48:18 fa20 kernel: nginx[10826] trap divide error ip:43bce1
sp:7fff4cd38160 error:0 in nginx[400000+6c000]
Aug 24 01:48:48 fa20 kernel: nginx[11046] trap divide error ip:43bce1
sp:7fff4cd38160 error:0 in nginx[400000+6c000]
Aug 24 01:49:01 fa20 kernel: nginx[11093] trap divide error ip:43bce1
sp:7fff4cd38160 error:0 in nginx[400000+6c000]

So I would like to know if it is a “kernel problem”, an NginX problem,
or simply a problem in my NginX configuration.

From logs, errors started when I modify upstream configuration. For now
I use this :
upstream clusterweb {
server 127.0.0.1:81 weight=4 max_fails=0 fail_timeout=10s;
server 127.0.0.2:82 backup;
}
upstream clusterwebtest {
server 127.0.0.1:81 max_fails=0 fail_timeout=10s;
server X.X.X.X:81 max_fails=100 fail_timeout=10s;
server 127.0.0.2:82 backup;
}

The “clusterwebtest” upstream is used only for test, there is no trafic
at all on it.

Thanks in advance for your help.
Olivier B.valet

2

Hello!

On Sun, Aug 24, 2008 at 01:03:03PM +0200, Olivier B.valet wrote:

Aug 24 01:48:18 fa20 kernel: nginx[10826] trap divide error ip:43bce1
I use this :
upstream clusterweb {
server 127.0.0.1:81 weight=4 max_fails=0 fail_timeout=10s;
server 127.0.0.2:82 backup;
}
upstream clusterwebtest {
server 127.0.0.1:81 max_fails=0 fail_timeout=10s;

The max_fails=0 known to be broken in 0.6.* (and 0.7.*) since
0.6.6. I’ve sent a patch to Igor some time ago, but it looks like
he forgot it.

Don’t use max_fails=0 or try the attached patch.

Maxim D.

3

On Sun, Aug 24, 2008 at 01:03:03PM +0200, Olivier B.valet wrote:

Aug 24 01:48:48 fa20 kernel: nginx[11046] trap divide error ip:43bce1
server 127.0.0.1:81 weight=4 max_fails=0 fail_timeout=10s;
server 127.0.0.2:82 backup;
}
upstream clusterwebtest {
server 127.0.0.1:81 max_fails=0 fail_timeout=10s;
server X.X.X.X:81 max_fails=100 fail_timeout=10s;
server 127.0.0.2:82 backup;
}

The “clusterwebtest” upstream is used only for test, there is no trafic
at all on it.

This is nginx bug, use Maxim’ patch.

4

Thanks a lot, it works. :wink:

Olivier B.valet

Maxim D. a écrit :