MATLAB: Am I receiving “Send 2 ()” errors when I try to connect to the MATLAB Web Server 1.2.3 (R14) on Linux

coreenterprisefedoraMATLAB Web Serverwebserver

When I try to run one of the demo examples of the MATLAB Web Server on Redhat Linux, I receive one of the following errors:

 Error: Send 2 () Error: 32

 Error: recv1() error: 104

Inspecting my error log, I see the warning:

 libgcc_s.so.1 must be installed for pthread_cancel to work

Best Answer

There is a conflict between the libgcc_s.so.1 library that ships with MATLAB and the libgcc_s.so.1 library installed on machines running Redhat Linux 9.0. To work around this issue, use the following steps:

1. Open the file matlabserver.conf for editing. This file can be found in the directory:

$MATLAB/webserver

where $MATLAB is the root directory of your MATLAB installation.

2. Add the following line to the file:

 LIBRARY_PATH=/lib:$LIBRARY_PATH

3. Save the file and restart the MATLAB Web Server

This will cause the MATLAB Web Server to see the system version of the libgcc_so.so.1 library.

Related Solutions

MATLAB: Does MATLAB 7.0 (R14) crash or generate errors when I call mexErrMsgTxt() in a MEX-file

Crashes when invoking mexErrMsgTxt or general runtime errors may be caused by an incompatibility between the version of GCC used to compile the MEX-file and the version used to compile MATLAB's libraries. Note that the only officially supported version of GCC is provided in Technical Note 1601:

http://www.mathworks.com/support/compilers/current_release/

If you are using a different version of GCC, you can work around this issue by removing the runtime libraries from the MATLAB directory and allowing the libraries from your GCC installation to be called. Here are the required steps:

1. Move the runtime libraries that MATLAB ships for GCC to another directory:

 cd $MATLAB
 cd sys/os/glnx86
 mkdir old
 mv libstdc++.* libg2c.* libgcc_s* old

2. Try to run MATLAB. You should be using the system libraries (which should match the system GCC you are using). If MATLAB won't start due to missing libraries, or if your GCC is not installed in /usr/bin, then add the directory of your GCC installation to $LD_LIBRARY_PATH.

If you are using a supported version of GCC, then the issue may be related to your version of GLIBC. For more details, see:

http://www.mathworks.com/support/solutions/data/1-PB3LI.html?solution=1-PB3LI

MATLAB: Do I receive an error about gcc version when executing a MEX-file or an executable generated by MATLAB Compiler on Linux

This bug has been fixed in Release 2007b (R2007b). For previous product releases, read below for any possible workarounds:

This bug has been fixed in Release 2007a (R2007a). For previous product releases, read below for any possible workarounds:

This error may occur when you use MATLAB or MATLAB Compiler in combination with GNU gcc 3.3.x, with gcc 3.2.3 that is distributed by Red Hat, or with another unsupported version of gcc. For the list of supported compilers, consult the following document:

http://www.mathworks.com/support/compilers/current_release/

See the related solution to compile and install a fully compatible GNU gcc. While installing the supported version of gcc is strongly recommended, some of our customers have reported the following workarounds are successful. These workarounds have not been tested and are not supported by MathWorks.

Workaround 1:

Before starting MATLAB (if executing a MEX-file) or before executing a file generated by MATLAB Compiler, set the LD_PRELOAD environment variable to /lib/libgcc_s.so.1

For bash users:

 export LD_PRELOAD=/lib/libgcc_s.so.1

For csh users:

 setenv LD_PRELOAD /lib/libgcc_s.so.1

Workaround 2:

Another workaround is to replace some library files in the MATLAB installation with the corresponding libraries from the version of GCC you are using. Be sure to create backup copies of any libraries you replace, since you may have errors in MATLAB after replacing the libraries. For example in MATLAB 7.1 (R14SP3) you could replace the following files:

libg2c.so.0.0.0 
libgcc_s.so.1 
libstdc++.so.5.0.3

and the symbolic links associated with these files with newer libraries from your gcc release. The files to be replaced are in the following directory:

$MATLABROOT/sys/os/$ARCH

(where $MATLABROOT is the MATLAB root directory on your machine, as returned by typing:

matlabroot

at the MATLAB command prompt and $ARCH is your architecture "glnx86" for 32-bit Linux and "glnxa64" for 64-bit Linux.)

Best Answer

Related Solutions

MATLAB: Does MATLAB 7.0 (R14) crash or generate errors when I call mexErrMsgTxt() in a MEX-file

MATLAB: Do I receive an error about gcc version when executing a MEX-file or an executable generated by MATLAB Compiler on Linux

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