syslog.log kernel: [truncated] L/npch ==NULL/n

[gds]

I noticed several threads that mention this system.log entry:

kernel: [truncated] L/npch ==NULL/npch ==NULL/n ... (usually repeats many times)

I see this with the OpenVpn server on the router with an active connection whenever data is accessed through the openvpn server by an openvpn client.

I also see it with idle vpn connections every 30-40 minutes (possibly due to vpn keepalives).

The place in the code where I see the printk() that produces this message is at
release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/net/ppp_generic.c:2973 HEAD version.

Since this error was described as innocuous (and possibly caused by closed source components) in other threads, I just commented out the
printk("pch ==NULL/n");
while letting the function ppp_get_conn_pkt_info() still returns an error.
So I no longer see the error filling the log.

But I still have no idea why pch pointer is NULL when vpn data flows through the openvpn server.

P/S: The correct printk should actually be
printk("pch ==NULL\n");

 

[aprudovsky]

same behavior here - active OpenVPN connection and lots of /npch ==NULL in log

 

[Goobi]

I noticed several threads that mention this system.log entry:

kernel: [truncated] L/npch ==NULL/npch ==NULL/n ... (usually repeats many times)

I see this with the OpenVpn server on the router with an active connection whenever data is accessed through the openvpn server by an openvpn client.

I also see it with idle vpn connections every 30-40 minutes (possibly due to vpn keepalives).

The place in the code where I see the printk() that produces this message is at
release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/net/ppp_generic.c:2973 HEAD version.

Since this error was described as innocuous (and possibly caused by closed source components) in other threads, I just commented out the
printk("pch ==NULL/n");
while letting the function ppp_get_conn_pkt_info() still returns an error.
So I no longer see the error filling the log.

But I still have no idea why pch pointer is NULL when vpn data flows through the openvpn server.

P/S: The correct printk should actually be
printk("pch ==NULL\n");

How exactly did you go about commenting out the printk function? Does this require a recompile of source code?

 

[gds]

How exactly did you go about commenting out the printk function? Does this require a recompile of source code?

Yes, I did a build on version 380.57 after commenting out the printk at release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/net/ppp_generic.c:2973. (But first I changed NULL to BULL to make sure this is where the message was actually coming from.)