Out of memory: Killed process ipt_tcpmss_target messages on RV042G V01

[ehosca]

Mar 16 20:24:48 2022 Kernel ipt_tcpmss_target: bad length (585 bytes)
Mar 16 20:24:48 2022 Kernel ipt_tcpmss_target: bad length (585 bytes)
Mar 16 18:44:10 2022 Kernel ipt_tcpmss_target: bad length (585 bytes)
Mar 16 18:44:10 2022 Kernel ipt_tcpmss_target: bad length (585 bytes)
Mar 16 17:13:10 2022 Kernel Out of memory: Killed process 29309 (getty).
Mar 16 17:13:10 2022 Kernel Out of Memory: Kill process 29309 (getty) score 115 and children.
Mar 16 17:13:06 2022 Kernel Out of memory: Killed process 29312 (more).
Mar 16 17:13:06 2022 Kernel Out of Memory: Kill process 29311 (sh) score 172 and children.
Mar 16 17:13:03 2022 Kernel Out of memory: Killed process 740 (udhcpd).
Mar 16 17:13:03 2022 Kernel Out of Memory: Kill process 740 (udhcpd) score 16 and children.
Mar 16 17:13:03 2022 Kernel Out of memory: Killed process 29293 (sleep).
Mar 16 17:13:03 2022 Kernel Out of Memory: Kill process 29293 (sleep) score 112 and children.
Mar 16 17:13:01 2022 Kernel Out of memory: Killed process 29291 (sleep).
Mar 16 17:13:01 2022 Kernel Out of Memory: Kill process 29291 (sleep) score 112 and children.
Mar 16 17:13:00 2022 Kernel Out of memory: Killed process 29306 (getty).
Mar 16 17:13:00 2022 Kernel Out of Memory: Kill process 29306 (getty) score 115 and children.
Mar 16 17:12:55 2022 Kernel Out of memory: Killed process 29305 (getty).
Mar 16 17:12:55 2022 Kernel Out of Memory: Kill process 29305 (getty) score 115 and children.
Mar 16 17:12:52 2022 Kernel Out of memory: Killed process 29302 (getty).
Mar 16 17:12:52 2022 Kernel Out of Memory: Kill process 29302 (getty) score 115 and children.
Mar 16 17:12:48 2022 Kernel Out of memory: Killed process 29298 (getty).
Mar 16 17:12:48 2022 Kernel Out of Memory: Kill process 29298 (getty) score 115 and children.
Mar 16 17:12:45 2022 Kernel Out of memory: Killed process 29300 (.rvOxx_rep0rt).

the incoming log on my RV042 is full of these messages and the router reports a CGI error when trying to connect to the web interface on http://192.168.1.1  

Any idea how to remedy this?

RV042G V01

Firmware Version : v4.2.3.14 

[marce1000]

 - Reboot the device , possible resource lock-up.

 M.

[ehosca]

can you elaborate on resource lockup please? is this a known issue?

my gut feeling is some outside entity is sending incorrectly sized packets as evidenced by the log entries like:

Mar 16 20:24:48 2022 Kernel ipt_tcpmss_target: bad length (585 bytes)

which is in turn causing the router to misbehave and ultimately become unresponsive. Perhaps this is an MTU issue? I have the WAN MTU set to Automatic.

I realize that this is an EOL device but rebooting should really not be an option for consideration as a fix for a router - especially for a device that carries the Cisco nameplate.

[marce1000]

 - Check if this thread could be relevant :

            https://community.cisco.com/t5/small-business-routers/ipt-tcpmss-target-bad-length/td-p/2887865

 M.

[ehosca]

Thanks for that link and I really appreciate you taking the time to respond.

I don't have a Multi-WAN failover setup, just a single WAN1 connected to my ISP's modem, WAN2/DMZ is disabled.

[marce1000]

 - For the Out of Memory errors I would still advice ,  a one time reboot 'for this case'  ; check if GUI becomes available and usable , check if TCP errors come back too (or not).

 M.

[ehosca]

Agreed. After a reboot the RV042G web interface is accessible again.

This is the 3rd time this has happened in a span of 2 months after years of trouble-free operation, so I thought I'd dig in a little deeper to find out the root cause.

The logs are always the same: a bunch of ipt_tcpmss_target: bad length errors followed by Out of memory errors for various processes.

[ehosca]

Happened again this morning, had to power-cycle the RV042 to get internet and web-management-interface back.

It's getting pretty annoying at this point with these random interruptions of service. The Incoming log is all too familiar now ...

Mar 21 08:22:08 2022	Kernel	ipt_tcpmss_target: bad length (585 bytes)
Mar 21 05:02:11 2022	Kernel	ipt_tcpmss_target: bad length (207 bytes)
Mar 20 21:39:30 2022	Kernel	ipt_tcpmss_target: bad length (585 bytes)
Mar 20 21:39:30 2022	Kernel	ipt_tcpmss_target: bad length (585 bytes)
Mar 20 15:24:24 2022	Kernel	ipt_tcpmss_target: bad length (585 bytes)
Mar 20 15:24:24 2022	Kernel	ipt_tcpmss_target: bad length (585 bytes)
Mar 20 14:46:40 2022	Kernel	ipt_tcpmss_target: bad length (585 bytes)
Mar 20 14:46:40 2022	Kernel	ipt_tcpmss_target: bad length (585 bytes)
Mar 20 09:00:27 2022	Kernel	Out of memory: Killed process 21553 (getty).
Mar 20 09:00:27 2022	Kernel	Out of Memory: Kill process 21553 (getty) score 115 and children.
Mar 20 09:00:23 2022	Kernel	Out of memory: Killed process 21549 (getty).
Mar 20 09:00:23 2022	Kernel	Out of Memory: Kill process 21549 (getty) score 115 and children.

[marce1000]

   -  Escalate with TAC : https://www.cisco.com/c/en/us/support/web/tsd-cisco-small-business-support-center-contacts.html

 M.

[thier0509]

Hello,

I have this problem too. 2 routers RV042G V01 with firmware version v4.2.3.14 connected via Gateway To Gateway VPN. Both with static IPs (Magenta Business product). Only WAN 1 programmed. The RV042 fail after about 3-4 days. Customer only reported months later that it annoys him to "constantly" restart.

Do you even get support for an EOL product?
@ehosca, did you get a solution yet?

regards,
T.

Incoming Log Table

[ehosca]

yes .. after reaching out to Cisco and getting nothing, I solved the problem by replacing the RV042 with this 

https://store.ui.com/collections/unifi-network-unifi-os-consoles/products/udm-pro

Highly recommended.

[Zsolt Kendi]

Same router and same problem. But the out of memory come on various processes near in every 3 month. In this case the internet connection become dead, and need more try to login onto the router. After router restarted then everything is works fine again.