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Re: httpd: _lwp_ctl: Cannot allocate memory
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
> 35 processes: 34 sleeping, 1 on CPU
> CPU states: 0.0% user, 0.0% nice, 0.0% system, 0.0% interrupt, 100%
> 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.
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