linux-kernel - Re: request_module: runaway loop modprobe net-pf-1 (is Re: Linux 2.6.21-rc1)

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Date:	Wed, 21 Feb 2007 16:18:09 -0800
From:	Greg KH <greg@...ah.com>
To:	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
Cc:	"YOSHIFUJI Hideaki / ?$B5HF#1QL@" <yoshfuji@...ux-ipv6.org>,
	linux-kernel@...r.kernel.org, Kay Sievers <kay.sievers@...y.org>
Subject: Re: request_module: runaway loop modprobe net-pf-1 (is Re: Linux 2.6.21-rc1)

On Thu, Feb 22, 2007 at 06:16:23AM +0900, OGAWA Hirofumi wrote:
> Greg KH <greg@...ah.com> writes:
> 
> > On Thu, Feb 22, 2007 at 04:12:04AM +0900, OGAWA Hirofumi wrote:
> >> YOSHIFUJI Hideaki / ?$B5HF#1QL@ <yoshfuji@...ux-ipv6.org> writes:
> >> 
> >> > In article <Pine.LNX.4.64.0702202043280.4043@...dy.linux-foundation.org> (at Tue, 20 Feb 2007 20:53:45 -0800 (PST)), Linus Torvalds <torvalds@...ux-foundation.org> says:
> >> >
> >> >> But there's a ton of architecture updates (arm, mips, powerpc, x86, you 
> >> >> name it), ACPI updates, and lots of driver work. And just a lot of 
> >> >> cleanups.
> >> >
> >> > I cannot boot 2.6.21-rc1; it falls into OOM-Killer.
> >> >
> >> > Interesting error message I can see is:
> >> >    request_module: runaway loop modprobe net-pf-1
> >> >
> >> > After bisecting, the commit
> >> >   Driver core: let request_module() send a /sys/modules/kmod/-uevent
> >> > (id c353c3fb0700a3c17ea2b0237710a184232ccd7f) is to blame.
> >> >
> >> > Reverting it fixes the issue to me.
> >> 
> >> /sbin/hotplug needs some module, but request_module() call /sbin/hotplug loop?
> >> Hm.. does the patch fix the problem?
> >
> > How does it loop?
> 
> E.g. something calls the request_modle(), and if hotplug is using
> socket(PF_UNIX) and af_unix is module, it also calls request_modle()?
> 
> Just my guess though...

Ugh, why does anyone make af_unix a module these days.  I thought only
Debian was that foolish...  :)

It will be interesting to see if this fixes the issue or not.

thanks,

greg k-h
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