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Re: httpd: _lwp_ctl: Cannot allocate memory

Andrew Doran wrote:
On Fri, Mar 14, 2008 at 10:07:32PM +1100, Sarton O'Brien wrote:

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

ps 'axs' will show threads within the httpd processes.

www# httpd -l|grep pre

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

Hmm, looks like httpd is not using threads to service requests.

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.

Could you try a ktrace -di on the failing command? Hopefully it does not
seteuid() which is likely to break the trace.
Appears not to be as reproducible as I first thought. When I used ktrace at boot, there were no problems present. So I removed the entry in rc.local and rebooted and then saw this:

Starting local daemons:Starting Webmin server in /root/webmin-1.310
perl: _lwp_ctl: Cannot allocate memory

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