Re: [uml-devel] 2.4.23(24?)-2 TT mode hangs on request_module

[Robbie Dinn <robbie@microbus.com>]

Henrik Nordstrom wrote:

> I can very reliably reproduce the problem by
> 
> 1. Boot in single user mode (/proc mounted etc.., but no other disturbing 
> factors)
> 2. iptables -A INPUT -j REJECT
> 

I think I may have seen this too, although I didn't understand what
was going on at the time (still don't). I am a little unsure what
versions of software I was using, because I wasn't working very
systematically. It might have been:
  host: 2.6.6 + skas3 patch or 2.6.6-rc3-mm2 + ska3 patch
	+ recent CVS netfilter p-o-m

  uml: 2.6.6 + blaisorblades unofficial patches
	and/or uml patches from suse kernel
	+ recent CVS netfilter p-o-m

I am just a monkey applying patches here, I don't claim to actually
understand the code.

I could get the UML machine to start in single user mode, but
when starting in run level 2 or 3, it would hang (eating lots of cpu
cycles) while starting the firewall.

I assumed that the hang was due to me failing to recompile and install
a fresh version of iptables on UML machine, but I don't have any good
reason to back up that belief. Does that sound plausible?
(I was using iptables-1.2.9 built against an older UML kernel, and had
the 1.2.10 sources waiting to be used).

> The sequence of events here is:
> 
> 1. iptables modprobes the base modules (iptable_filter), then uploads the 
> new iptable which referes to the REJECT match.
> 
> 2. The kernel verifies the new iptable and triggers a request_module call
> for the ipt_REJECT module and here the kernel gets completely stuck..
> 
> If all required modules are loaded manually avoiding the call to
> request_module then there is no problem, but unfortunately this is not a
> very feasible workaround here..
> 

The UML binary that I was using had all the iptables stuff statically
linked. I wasn't using modules at all.

If by so minor miracle I do manage to assemble something that works or
I find some useful information, I will post a follow up of course.

HTH

Robbie Dinn


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