Issues with DCE

Michele Polese

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Nov 28, 2016, 12:26:32 PM11/28/16

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Dear all,
I am trying to install DCE in a new machine (based on Debian 20).
In particular, I have a setup that works flawlessly in another Ubuntu 16.04 pc. I use Libos (the MPTCP branch of net-next-nuse) with a custom ns-3 module. I did not modify ns-3-dce.
The compilation is successful, the result of the command

ls $DCE_PATH

is

dccp-client            test-fork               test-select
dccp-server            test-fork-fd            test-sem
freebsd-iproute        test-gcc-builtin-apply  test-signal
liblinux.so            test-ioctl              test-sleep
libsim-linux.so        test-iperf              test-socket
ping                   test-local-socket       test-stdio
ping6                  test-malloc             test-stdlib
tcp-client             test-malloc-2           test-strerror
tcp-loopback           test-mutex              test-string
tcp-server             test-name               test-tcp-socket
test-bug-multi-select  test-nanosleep          test-timer-fd
test-clock-gettime     test-netdb              test-tsearch
test-cond              test-once               udp-client
test-dirent            test-pipe               udp-echo-client
test-empty             test-poll               udp-echo-server
test-env               test-pthread            udp-perf
test-exec              test-pthread-key        udp-server
test-exec-target-1     test-random             unix-client
test-fd-simple         test-raw-socket         unix-server

However, when I launch an example, I get this error:

assert failed. cond="filePath.length () > 0", msg="Stack file 'liblinux.so' not found ! Please check your DCE_PATH environment variable.", file=../model/kernel-socket-fd-factory.cc, line=573
terminate called without an active exception

Any idea?
Thanks,
Michele

Matt Anonyme

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Nov 29, 2016, 9:54:37 AM11/29/16

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DCE_PATH is an environement variable just like PATH.
DCE can't find the file "

liblinux.so" so you should export DCE_PATH="folder/with/liblinux:/other/folder"

Cheers

Michele Polese

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Nov 29, 2016, 10:08:04 AM11/29/16

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Hi Matt

2016-11-29 15:54 GMT+01:00 Matt Anonyme <matt...@gmail.com>:

DCE_PATH is an environement variable just like PATH.

DCE can't find the file "liblinux.so" so you should export DCE_PATH="folder/with/liblinux:/other/folder"

this is what I did, and in order to try if I set it correctly I called "ls $DCE_PATH" and in the results there was also liblinux (actually, the symbolic link to liblinux, which is created at the end of the compilation with Bake).

However, the problem was not solved.

Thanks for your time,

Michele

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Michele Polese

Ph.D. Student

Dept. of Information Engineering (DEI) - SIGNET Research Group

University of Padova

Via Gradenigo 6/B, 35131 Padova (Italy)

email: mic...@polese.io

web: polese.io

Matt Anonyme

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Nov 29, 2016, 10:19:16 AM11/29/16

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where did you do the 'ls' from ? if you do $ls $TOTO and TOTO is not set, ls will show the current directory.
How do you export DCE_PATH and how do you run DCE ? I think some waf scripts will remove the environement (like test.py), in which case you have to run "./waf test-runner" or sthg like that.

Hi Matt

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Michele Polese

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Nov 29, 2016, 10:33:58 AM11/29/16

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2016-11-29 16:19 GMT+01:00 Matt Anonyme <matt...@gmail.com>:

where did you do the 'ls' from ? if you do $ls $TOTO and TOTO is not set, ls will show the current directory.

I called it from the folder in which I execute the script.

-bash-4.3$ pwd
/nfsd/signet/ns/polese/net-next-nuse/tools/testing/libos/buildtop/source/ns-3-dce
-bash-4.3$ export DCE_PATH="/nfsd/signet/ns/polese/net-next-nuse/tools/testing/libos/buildtop/build/bin_dce/"
-bash-4.3$ echo $DCE_PATH
/nfsd/signet/ns/polese/net-next-nuse/tools/testing/libos/buildtop/build/bin_dce/
-bash-4.3$ ls $DCE_PATH

dccp-client            test-fork               test-select
dccp-server            test-fork-fd            test-sem
freebsd-iproute        test-gcc-builtin-apply test-signal
liblinux.so            test-ioctl              test-sleep
libsim-linux.so        test-iperf              test-socket
ping                   test-local-socket       test-stdio
ping6                  test-malloc             test-stdlib
tcp-client             test-malloc-2           test-strerror
tcp-loopback           test-mutex              test-string
tcp-server             test-name               test-tcp-socket
test-bug-multi-select test-nanosleep          test-timer-fd
test-clock-gettime     test-netdb              test-tsearch
test-cond              test-once               udp-client
test-dirent            test-pipe               udp-echo-client
test-empty             test-poll               udp-echo-server
test-env               test-pthread            udp-perf
test-exec              test-pthread-key        udp-server
test-exec-target-1     test-random             unix-client
test-fd-simple         test-raw-socket         unix-server

BTW, I did not change the location of liblinux from the default one, and in other installations I never had this problem.

I am trying to launch the simulations in a remote computing cluster, maybe there are some issues with the paths for this particular case?

Thanks for your help!

Michele

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Matt Anonyme

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Nov 29, 2016, 10:59:27 AM11/29/16

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Looks good. Try running with NS_LOG="*" to see debug messages and grep for liblinux.so.
If DCE itself lacks helpful DCE_PATH debug statements, you (or I) can add some.

Michele Polese

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Dec 6, 2016, 12:18:53 PM12/6/16

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Hi Matt,

I have an update. The DEC_PATH is found correctly, and ExecUtils::SeekFile scans all the folders in the path. However, when it reaches the correct one, the CheckFileExe returns false (0 != ::stat (file.c_str (), &st)) is true).

Any idea on why?

Thanks for your time and your help!

Michele

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Matt Anonyme

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Dec 7, 2016, 9:22:33 PM12/7/16

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I remember having a problem with some function buidling the path wrongly, like "//X" instead of "/X" but I can't remember the name. I can't look at this more closely before next week but you could check by yourself by setting a breakpoint on SeekFile, iterate line by line and print the current variables.

Michele Polese

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Dec 8, 2016, 11:18:01 AM12/8/16

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Hi Matt, I added some logs

Here is DCE_PATH:

/nfsd/signet/ns/polese/net-next-nuse/tools/testing/libos/buildtop/build/bin_dce/:/nfsd/signet/ns/polese/net-next-nuse/tools/testing/libos/buildtop/source/ns-3-dce/build/bin_dce:/nfsd/signet/ns/polese/net-next-nuse/tools/testing/libos/buildtop/build/sbin:/nfsd/signet/ns/polese/net-next-nuse/tools/testing/libos/buildtop/build/bin_dce:/usr/lib/gcc/x86_64-redhat-linux/4.8.3:/nfsd/signet/ns/polese/net-next-nuse/tools/testing/libos/buildtop/source/ns-3-dce/build/lib:/nfsd/signet/ns/polese/net-next-nuse/tools/testing/libos/buildtop/source/ns-3-dce/build/lib64:/nfsd/signet/ns/polese/net-next-nuse/tools/testing/libos/buildtop/source/ns-3-dce/build/bin:/nfsd/signet/ns/polese/net-next-nuse/tools/testing/libos/buildtop/build/lib:/nfsd/signet/ns/polese/net-next-nuse/tools/testing/libos/buildtop/build/lib64:/nfsd/signet/ns/polese/net-next-nuse/tools/testing/libos/buildtop/build/bin

While these are the folders visited by SeekFile, (0 != ::stat (file.c_str (), &st)) shows that this condition is true thus the CheckFileExe fails

m_paths p /nfsd/signet/ns/polese/net-next-nuse/tools/testing/libos/buildtop/build/bin_dce

pp /nfsd/signet/ns/polese/net-next-nuse/tools/testing/libos/buildtop/build/bin_dce/liblinux.so

pp after cano /nfsd/signet/ns/polese/net-next-nuse/tools/testing/libos/buildtop/build/bin_dce/liblinux.so