undefined symbol: ecrt_slave_config_sdo

Hi,
I faced the issue "undefined symbol: ecrt_slave_config_sdo" when I ran linuxcnc, I am using below listed configuration.

Current Linux Kernel version
$ 4.9.47-rt37

Linux CNC version
$ 2.9.0~pre0

Current Ethercat etherlab install : hg clone hg.code.sf.net/p/etherlabmaster/code ethercat-hg

Current Ethercat linuxcnc install : github.com/sittner/linuxcnc-ethercat
$ cd linuxcnc-ethercat-master/
$ make

copy lcec_conf ==> ../linuxcnc-ethercat/src/lcec_conf ==> to your linuxcnc sim map (copy it where your ini files is)
copy lcec_so ==> ../linuxcnc-ethercat/src/lcec.so ==> to your home/.../linuxcnc/rtlib/ (this is only for linuxcnc_dev users)

$ Linux cnc
linuxcnc /home/linuxcnc/machinecnc/my-devices/my.ini

#Error log
LINUXCNC - 2.9.0~pre0
Machine configuration directory is '/home/linuxcnc/machinecnc/my-devices'
Machine configuration file is 'my.ini'
Starting LinuxCNC..werealtime
lcec: dlopen: /home/linuxcnc/machinecnc/linuxcnc/linuxcnc-master/rtlib/lcec.so: undefined symbol: ecrt_slave_config_sdo
./my-lathe.hal:16: waitpid failed /home/linuxcnc/machinecnc/linuxcnc/linuxcnc-master/bin/rtapi_app lcec
./my-lathe.hal:16: /home/linuxcnc/machinecnc/linuxcnc/linuxcnc-master/bin/rtapi_app exited without becoming ready
./my-lathe.hal:16: insmod for lcec failed, returned -1
Shutting down and cleaning up LinuxCNC...
Note: Using POSIX realtime
LinuxCNC terminated with an error. You can find more information in the log:
/home/linuxcnc/linuxcnc_debug.txt
and
/home/linuxcnc/linuxcnc_print.txt
as well as in the output of the shell command 'dmesg' and in the terminal


I tried many things by refering the post but no luck.
Please help me to find What could be the isssue.

Regards,
Pradip

Hi Pradip,

In your case it could be a little problem, but where?

It can be a depmod problem.
In the past it could be a file header problem, because you have a undifined symbol.
Is you ethercat bus running? You can do a command for this.

Read This.

Hello @pradipgor1990
this error "undefined symbol: ecrt_slave_config_sdo" when starting linuxcnc is quite well known, it happens because when compiling linuxcnc-ethercat libethercat.so is not defined in lcec.so, use this command to see if the way to fix it is linked a , in the old version in the file realtime.mk and in the new version in the user.mk file, do you have igh-ethercat installed in the directory?
You can try the file that I attach modified if it works for you,

Attached link of similar problem in case they can help you.
github.com/sittner/linuxcnc-ethercat/issues/61

Greeting
Chimeno