CODEWITHSUNDEEP
c++linux
Lutorm
Lutorm

Reputation: 379

Strange symbol lookup error in libstdc++

Trying to track down a segfault somewhere in MPI, I got this error:

./mpitest: symbol lookup error: /usr/lib64/libstdc++.so.6: bàþ;@ BC_
-------------------------------------------------------------------
mpirun has exited due to process rank 2 with PID 8729 on ...

First, I'm used to getting lookup errors when the process is loaded if the library path is wrong. But those all happen before the process starts executing. This happened in the middle of the output from the test. Shouldn't all symbols be resolved by the runtime loader before the process starts?

Second, that symbol looks like garbage. It's certainly not a normal mangled C++ symbol.

Is it possible for memory corruptions (since I am tracking a segfault, it's likely there's something like that going on) to corrupt symbols like this?

This was compiled with icpc 12.0.3 20110309 on a Linux 2.6.18-194.32.1.el5 x86_64 machine.

Upvotes: 3

Views: 1649

Answers (1)

gogators
gogators

Reputation: 815

OpenMPI loads plugins as dynamic shared object at runtime when MPI_INIT is called. See this FAQ. Therefore symbol lookup happens at that time. So it looks to me that your OpenMPI's libmpi_cxx.so was built against a different libstdc++ than what is available or found at runtime. on the system.

You can either rebuild OpenMPI, or if the correct libstdc++ is somewhere on your system (not /usr/lib64/libstdc++.so.6), you can adjust your LD_LIBRARY_PATH. Also, try setting LD_DEBUG=files to see if you are in fact load 2 different libstdc++'s.

Upvotes: 2

Related Questions