Date: Thu, 8 Jul 2021 20:53:01 -0400 From: Karl Denninger <karl@denninger.net> To: stable@freebsd.org Subject: Re: 12.2 Splay Tree ipfw potential panic source Message-ID: <a6a9c220-fee6-a0ea-7721-f88ff865a6a8@denninger.net> In-Reply-To: <20210708221134.GA32658@belenus.iks-jena.de> References: <2e3dcd4d-c8e6-8381-0010-d0844c99901e@denninger.net> <20210708221134.GA32658@belenus.iks-jena.de>
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On 7/8/2021 18:11, Lutz Donnerhacke wrote:
> On Thu, Jul 08, 2021 at 05:38:35PM -0400, Karl Denninger wrote:
>> This is the only change I'm aware of in the build I just put on a fire=
wall
>> that uses ipfw heavily, and it is not panic'ing quite regularly.
> The code was delayed considerably for MFC until such problems are
> identified, tested and solved (AFAIK) in main. The tests are also prese=
nt in
> stable, and the CI system (jenkins) did not report any failure after MF=
Cing.
>
>> I'll see if I can get a dump from it but that may be difficult as the
>> machine in question is a "small box" without attached storage (boots f=
rom
>> an SD card.)
> That would be really helpful. Most notably the bud I can't find easily =
are
> in the area of inbound redirection and protocol helpers. My use case is=
> Carrier Grade NAT (outbound).
The box in question has a material number of "permanent" hole punch=20
redirects for inbound links, to wit:
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ${fwcmd} nat 100 config if ${oif} l=
og same_ports reset=20
redirect_port tcp=C2=A0 ${fwd}:2552 2552 redirect_port tcp=20
192.168.10.214:8080 8080 redirect_port tcp 192.168.10.203:443 4443=20
redirect_port tcp 192.168.10.216:8080 8088 redirect_port
tcp ${fwd}:993 993 redirect_port tcp ${fwd}:4552 4552 redirect_port tcp=20
${fwd}:imaps imaps redirect_port tcp ${fwd}:11443 11443 redirect_port=20
tcp ${fwd}:80 80 redirect_port tcp ${fwd}:2200 22042
The kernel with the splay-tree improvements survives less than /five=20
minutes /before it blows up -- repeatedly.=C2=A0 There is a client (on an=
=20
Android phone) that maintains a connection via one of those=20
(specifically, to the 10.214 ip) along with inbound email on 2552 from=20
an off-site relay.
I will see if I can get at least a panic backtrace, although the=20
impacted box is a pcEngines firewall that boots of an SD card.=C2=A0 An A=
MD=20
box running the same rev but without any ipfw side of things running has =
been up for a couple of days without incident.=C2=A0 Odds are reasonably-=
high=20
the splay tree changes are responsible since that's the "stand-out"=20
difference between the two boxes.
--=20
Karl Denninger
karl@denninger.net <mailto:karl@denninger.net>
/The Market Ticker/
/[S/MIME encrypted email preferred]/
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