Experimental Physics and
Industrial Control System

"Sobhani, Bayan" <[email protected]> · Thu, 1 Feb 2018 19:25:15 +0000

Thank you Mark and Kay, I believe my problem is solved now. I ran the IOC from gdb that way and saw:

#5  0x00007ffff7bd89a6 in SmarActMCS2Axis::stop(double) [clone .localalias.1]
    () from /home/alex/iocs/motor/lib/linux-x86_64/libsmarActMCS2Motor.so
#6  0x00007ffff7bd89a6 in SmarActMCS2Axis::stop(double) [clone .localalias.1]
    () from /home/alex/iocs/motor/lib/linux-x86_64/libsmarActMCS2Motor.so

Repeated over and over again. My SmarActMCS2Axis::stop function had a line in it that read "stop(channel)", which was supposed to be calling a function in the global namespace, but was instead calling itself recursively. Replacing it with "::stop(channel)" fixed the problem.

Alex

-----Original Message-----
From: Kasemir, Kay [mailto:[email protected]] 
Sent: Thursday, February 1, 2018 1:49 PM
To: Sobhani, Bayan <[email protected]>
Cc: [email protected]
Subject: Re: Segmentation fault when setting motorStatusProblem_ to 1

>How exactly do i run the IOC from gdb? 

# Go to the directory that has the st.cmd file cd iocStart/your_ioc_directory

# Check the st.cmd file. It should start with something like #  "#!../../bin/linuxx86_64/name_of_your_ioc_binary"
#
# That's what you load into GDB

gdb ../../bin/linuxx86_64/name_of_your_ioc_binary

# Then, inside gdb, you start the process with the st.cmd file as input run st.cmd

# Once it crashes, list the threads
info threads

# Pick one
thread 3

# Get backtrace
bt

# Select some interesting stack frame
frame 2

# print stuff
print some_var
print *some_pointer_var

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System