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SubjectRe: kernel: request_module[net-pf-10]: fork failed, errno 11
On Sun, Jun 09, 2002 at 06:54:14PM +0100, Athanasius wrote:
> On Sat, Jun 08, 2002 at 08:22:05PM +1000, Keith Owens wrote:
> > On Sat, 8 Jun 2002 10:43:07 +0100,
> > Athanasius <link@gurus.tf> wrote:
> > > I'm seeing a lot of:
> > >
> > > kernel: request_module[net-pf-10]: fork failed, errno 11
> [snip]
> >
> > That error is occurring before modprobe has run, long before it gets to
> > modules.conf. You need to find out why fork() for modprobe on your
> > system is failing with EAGAIN. Have you reached the limit on the
> > number of tasks?
>
> Not as far as I can tell. It would be easier to tell if 'sa' (BSD
> process accounting) carried useful information like timestamps per
> process or even just their PIDs (to match to a *.* syslog'd file).

Ok, a little more investigation:

root@bowl:/sbin# cat modprobe-logging
#!/bin/sh

echo "`date` `ps axh | wc -l`: $@" >> /var/log/modprobe.log
exec /sbin/modprobe $@
root@bowl:/sbin# cat /proc/sys/kernel/modprobe
/sbin/modprobe-logging

In /var/log/kern.log:
Jun 11 14:36:58 bowl kernel: request_module[net-pf-10]: fork failed, errno 11

And in /var/log/modprobe.log:

Tue Jun 11 14:36:41 BST 2002 229: -s -k -- net-pf-10
Tue Jun 11 14:36:58 BST 2002 228: -s -k -- net-pf-10
Tue Jun 11 14:36:58 BST 2002 227: -s -k -- net-pf-10
Tue Jun 11 14:37:02 BST 2002 227: -s -k -- net-pf-10

/proc/sys/kernel/threads-max is 4095.

So, nowhere near threads-max (if ps axh is a good test of that),
certainly not processes-wise. Yet at times the request_module is
failing anyway. It would seem that an immediate followup attempt works.
Yup, just had another instance:

Jun 11 14:40:11 bowl kernel: request_module[net-pf-10]: fork failed, errno 11
Tue Jun 11 14:40:07 BST 2002 235: -s -k -- net-pf-10
Tue Jun 11 14:40:11 BST 2002 229: -s -k -- net-pf-10
Tue Jun 11 14:40:11 BST 2002 230: -s -k -- net-pf-10
Tue Jun 11 14:40:42 BST 2002 227: -s -k -- net-pf-10

Note that ulimit -u is 256, but that's per login instance normally and
I'd not have thought a kernel thread goes through PAM anyway...

-Ath
--
- Athanasius = Athanasius(at)miggy.org.uk / http://www.clan-lovely.org/~athan/
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"And it's me who is my enemy. Me who beats me up.
Me who makes the monsters. Me who strips my confidence." Paula Cole - ME
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