Re: Linux 4.2.4

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On 25.10.2015 10:03, Willy Tarreau wrote:
On Sun, Oct 25, 2015 at 01:25:47AM -0700, Greg KH wrote:
On Sun, Oct 25, 2015 at 08:25:49AM +0100, Gerhard Wiesinger wrote:
On 23.10.2015 02:33, Greg KH wrote:
I'm announcing the release of the 4.2.4 kernel.

All users of the 4.2 kernel series must upgrade.

The updated 4.2.y git tree can be found at:
	git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git linux-4.2.y
and can be browsed at the normal kernel.org git web browser:
	http://git.kernel.org/?p=linux/kernel/git/stable/linux-stable.git;a=summary

thanks,

greg k-h

Hello Greg,

Kernel 4.2.4 is still broken regarding iptables/ipset:
https://bugzilla.redhat.com/show_bug.cgi?id=1272645

Kernel 4.1.10 works well.

Please fix it ASAP.
Fix it with what patch?
It's not even sure there's a patch for this. There were numerous changes
to ipset between 4.1 and 4.2 and very few in 4.3-rc, any you backported
them all. Also, Gerhard's trace in the bugzilla report above is very
poor, there's just one line of the panic, nothing exploitable at all,
nothing even indicates that it is related to ipset at all.

Sorry, don't have any more information. From the bugzilla report:
Message from syslogd@arm at Oct 24 20:05:09 ...
 kernel:Process ipset (pid: 2055, stack limit = 0xe8404220)

So ipset has a problem ...


Gerhard, it would be easier if you could bisect between 4.1 and 4.2 to
find what patch introduced the regression if you can easily reproduce
the issue. That would make it more obvious what to look at and the
patch author might have some ideas about the real problem.



The device is in production so I can't play around here. Nevertheless I can try a patch. But should be easy to reproduce in developers testing environment with shorewall/netfilter and ipset. As shorewall6 is activated it might also be an IPv6 issue.

Kernel 4.2 seems to me not well tested in the netfilter parts at all (Bug with already known bugfix https://lists.debian.org/debian-kernel/2015/10/msg00034.html was triggered on 2 of 3 of my machines, the new bug on 1 of 1 tested machine).

Ciao,
Gerhard

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