Re: httpd: _lwp_ctl: Cannot allocate memory

[Sarton O'Brien <bsd-xen%roguewrt.org@localhost>]

Andrew Doran wrote:
> On Fri, Mar 14, 2008 at 01:30:31PM +1100, Sarton O'Brien wrote:
>   
> > Is this a known issue?
> >
> > /etc/rc.d/apache stop
> > Stopping apache.
> > httpd: _lwp_ctl: Cannot allocate memory
> >
> > NetBSD www.internal 4.99.55 NetBSD 4.99.55 (XEN3_DOMU) #0: Tue Mar 11 19:53:46 
> > EST 2008  root%mx0.internal@localhost:/usr/obj/sys/arch/i386/compile/XEN3_DOMU i386
> >     
>
> How much memory did you give the domain? Was it under memory pressure?
> How many threads do your apache processes have each?
>   

I'd only just booted, so no pressure outside of starting/booting.

This is what top reports after being up for over 8 hours:

load averages:  0.02,  0.01,  0.00                  up 0 days,  8:35   
21:51:19
35 processes:  34 sleeping, 1 on CPU
CPU states:  0.0% user,  0.0% nice,  0.0% system,  0.0% interrupt,  100% 
idle
Memory: 298M Act, 12M Wired, 16M Exec, 135M File, 168M Free
Swap: 512M Total, 512M Free

www# ps ax|grep httpd
5214 ?        I    0:00.01 /usr/pkg/sbin/httpd -k start
5382 ?        I    0:00.01 /usr/pkg/sbin/httpd -k start
5441 ?        I    0:00.01 /usr/pkg/sbin/httpd -k start
6237 ?        I    0:00.00 /usr/pkg/sbin/httpd -k start
6331 ?        I    0:00.02 /usr/pkg/sbin/httpd -k start
6939 ?        I    0:00.01 /usr/pkg/sbin/httpd -k start
7074 ?        Ss   0:00.25 /usr/pkg/sbin/httpd -k start
7362 ?        I    0:00.00 /usr/pkg/sbin/httpd -k start
7468 ?        I    0:00.00 /usr/pkg/sbin/httpd -k start
8677 ?        I    0:00.00 /usr/pkg/sbin/httpd -k start
8758 ?        I    0:00.01 /usr/pkg/sbin/httpd -k start

www# httpd -l|grep pre
 prefork.c

<IfModule mpm_prefork_module>
   StartServers         10
   MinSpareServers       5
   MaxSpareServers      10
   MaxClients          150
   MaxRequestsPerChild   0
</IfModule>

www# pkg_info |grep -i apache
apr-1.2.12          Apache Portable Runtime
apr-util-1.2.10     Apache Portable Runtime utilities
apache-2.2.8        Apache HTTP (Web) server, version 2
ap22-php5-5.2.5nb1  Apache (apache22) module for PHP5
ap22-bw-0.6nb2      Class-based bandwidth limiting module for Apache 2

I'll note that stopping and starting now does not seem to cause the problem.

With the other one I reported for webmin, that is 100% repeatable as it 
starts from rc.local ... well attempts to but never actually does. 
Attempting to start it _after_ boot seems to work. The error is always 
generated at boot. The same domu that fails with apache, starts webmin 
fine at boot. I'm guessing if I had of left it for a while rather than 
rebooting, apache probably would have stopped. There seems to be a time 
factor and it seems to occur early on in boot/after boot.

If there is more I can provide please ask.

Sarton