undefined symbol: criu_init_opts

Hey, thanks for the prototype

I am trying to run this on ubuntu 18.10, oracle jdk 1.8.0_201, criu 3.11, gcc 8.2

When I am trying to run the prototype though, I get the following output:

keks@ubuntu:~/CRIUForJava$ sudo setsid /opt/jdk/jdk1.8.0_201/bin/java -XX:+UseSerialGC -XX:-UsePerfData -Djava.library.path=$LOAD_LIBRARY_PATH TestRandom 1000000 1000
Before any goodness
Library path = /usr/lib:./
About to load Checkpoint Restore library libCheckpointRestore.so
About to load criu library libcriu.so
Before call to load CheckpointRestore
After call to load CheckpointRestore
After call to load criu
/opt/jdk/jdk1.8.0_201/bin/java: symbol lookup error: /home/keks/CRIUForJava/libCheckpointRestore.so: undefined symbol: criu_init_opts

Here is what I did:

1. Ensured that my system has checkpointrestore enabled

2. Ensured criu version criu 3.11

3. Ran sudo criu service& in the cloned git directory ( it doesnt matter where i create the socket file, right? )

4. Checked criu -> looked good

5. Compiled the CheckpointRestore.java ( aparently it compiled just this file, so I had to do javac *.java in order to run the example )

6-7. Generated the .h file and made it an hpp file

8. Exported the LOAD_LIBRARY_PATH export LOAD_LIBRARY_PATH=/usr/lib:./
   ( In the readme you use the /usr/lib64 directory, on ubuntu somehow i don't have this one, so I copied the libcriu.so file manually into /usr/lib and exported the path )

9. Built the criu native library
   gcc -shared -fPIC -I/opt/jdk/jdk1.8.0_201/include -I/opt/jdk/jdk1.8.0_201/include/linux -I/usr/lib/ -I/usr/include/criu -lcriu -o libCheckpointRestore.so CheckpointRestore.cpp
   ( It appeared that the -l/usr/include could not find the criu.h as it didnt exist under the path, so I copied the {criu_sources_path}/lib/c folder into the /usr/include/criu )

10. Ran the example (see error in the beginning)

Elaborations:
so it looks like criu_init_opts symbol could not be found.

The symbol is not defined in the libCheckpointRestore.so

keks@ubuntu:~/CRIUForJava$ nm libCheckpointRestore.so 
                 ...
                 U criu_check
                 U criu_dump
                 U criu_init_opts
                 ...

The symbol is defined in libcriu.so

keks@ubuntu:~/CRIUForJava$ nm /usr/lib/libcriu.so 
...
0000000000009370 T criu_init_opts
...

So somehow the symbols are not being loaded properly... Am I doing something wrong here? Should I just should use RedHat Linux instead of Ubuntu?

[chflood]

You should be getting criu_init_opts and friends from libcriu. That should be loaded when CheckpointRestore.java calls System.loadLibrary("criu"). I'm kind of flummoxed. Christine

…

On Thu, May 9, 2019 at 7:08 AM oe19fyfa ***@***.***> wrote: Hey, thanks for the prototype I am trying to run this on ubuntu 18.10, oracle jdk 1.8.0_201, criu 3.11, gcc 8.2 When I am trying to run the prototype though, I get the following output: ***@***.***:~/CRIUForJava$ sudo setsid /opt/jdk/jdk1.8.0_201/bin/java -XX:+UseSerialGC -XX:-UsePerfData -Djava.library.path=$LOAD_LIBRARY_PATH TestRandom 1000000 1000 Before any goodness Library path = /usr/lib:./ About to load Checkpoint Restore library libCheckpointRestore.so About to load criu library libcriu.so Before call to load CheckpointRestore After call to load CheckpointRestore After call to load criu /opt/jdk/jdk1.8.0_201/bin/java: symbol lookup error: /home/keks/CRIUForJava/libCheckpointRestore.so: undefined symbol: criu_init_opts Here is what I did: 1. Ensured that my system has checkpointrestore enabled 2. Ensured criu version criu 3.11 3. Ran sudo criu service& in the cloned git directory ( it doesnt matter where i create the socket file, right? ) 4. Checked criu -> looked good 5. Compiled the CheckpointRestore.java ( aparently it compiled just this file, so I had to do javac *.java in order to run the example ) 6-7. Generated the .h file and made it an hpp file 1. Exported the LOAD_LIBRARY_PATH export LOAD_LIBRARY_PATH=/usr/lib:./ ( In the readme you use the /usr/lib64 directory, on ubuntu somehow i don't have this one, so I copied the libcriu.so file manually into /usr/lib and exported the path ) 2. Built the criu native library gcc -shared -fPIC -I/opt/jdk/jdk1.8.0_201/include -I/opt/jdk/jdk1.8.0_201/include/linux -I/usr/lib/ -I/usr/include/criu -lcriu -o libCheckpointRestore.so CheckpointRestore.cpp ( It appeared that the -l/usr/include could not find the criu.h as it didnt exist under the path, so I copied the {criu_sources_path}/lib/c folder into the /usr/include/criu ) 3. Ran the example (see error in the beginning) Elaborations: so it looks like criu_init_opts symbol could not be found. The symbol is not defined in the libCheckpointRestore.so ***@***.***:~/CRIUForJava$ nm libCheckpointRestore.so ... U criu_check U criu_dump U criu_init_opts ... The symbol is defined in libcriu.so ***@***.***:~/CRIUForJava$ nm /usr/lib/libcriu.so ... 0000000000009370 T criu_init_opts ... So somehow the symbols are not being loaded properly... Am I doing something wrong here? Should I just should use RedHat Linux instead of Ubuntu? — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#1>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AE3CLBA3NVG3BSBK5FIYM2DPUQAZJANCNFSM4HLZPOVA> .

@chflood can you please do nm libCheckpointRestore.so on your compiled shared library and send the output? I am trying to figure out whether i did something wrong with the gcc command....

[Sir-Will]

I'm having the same or similar issue:

root@omega ~/criu_testing/CRIUForJava # setsid java -XX:+UseSerialGC -XX:-UsePerfData -Djava.library.path=/usr/lib/x86_64-linux-gnu:./ TestRandom 1000000 1000
root@omega ~/criu_testing/CRIUForJava # Hook:Before Checkpoint: Restore Command: As root java -XX:+UseSerialGC -XX:-UsePerfData -Djava.library.path=$LOAD_LIBRARY_PATH  TestRandomRestore /home/chf/SavedWorlds/run1596254846077
File not found

path = /home/chf/SavedWorlds/run1596254846077
Can't open images dir: No such file or directory
java: symbol lookup error: /root/criu_testing/CRIUForJava/libCheckpointRestore.so: undefined symbol: criu_init_opts

[chflood]

Hi I've got a tutorial coming out on red hat blogs soon that includes a better tutorial. I will let you know when it goes live. Christine

…

On Sat, Aug 1, 2020 at 12:10 AM Sir-Will ***@***.***> wrote: I'm having the same or similar issue: ***@***.*** ~/criu_testing/CRIUForJava # setsid java -XX:+UseSerialGC -XX:-UsePerfData -Djava.library.path=/usr/lib/x86_64-linux-gnu:./ TestRandom 1000000 1000 ***@***.*** ~/criu_testing/CRIUForJava # Hook:Before Checkpoint: Restore Command: As root java -XX:+UseSerialGC -XX:-UsePerfData -Djava.library.path=$LOAD_LIBRARY_PATH TestRandomRestore /home/chf/SavedWorlds/run1596254846077 File not found path = /home/chf/SavedWorlds/run1596254846077 Can't open images dir: No such file or directory java: symbol lookup error: /root/criu_testing/CRIUForJava/libCheckpointRestore.so: undefined symbol: criu_init_opts — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#1 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AE3CLBBWAPWDQLRXLMNOLIDR6OIQ7ANCNFSM4HLZPOVA> .

[Sir-Will]

hey, any news?

[chflood]

If you send me your email address I will send you a preview of the articles. I would love your feedback. Christine chf@redhat.com

…

On Sat, Aug 29, 2020 at 2:19 PM Sir-Will ***@***.***> wrote: hey, any news? — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#1 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AE3CLBEJYNVT5X7RBK7ZYU3SDFA7TANCNFSM4HLZPOVA> .

[Sir-Will]

I have sent you an email.