xexpand_2D_3D segment fault

[yjgao-gfz]

Description

Hello, here I am trying to run the example:small_example_coupling_axisem_specfem, the explosion source has no problems but when i use the moment tensor source, it failed at expand_2D_3D with segment fault as below

Program received signal SIGSEGV: Segmentation fault - invalid memory reference.

Thanks!

Affected SPECFEM3D version

4.1.1

Your software and hardware environment

linux desktop

Reproduction steps

1 bash run_this_example.sh and stuck at 
mpirun -np $nproc_specfem $currentdir/bin/xexpand_2D_3D > output_expand_2D_3D.txt 2>&1

Screenshots

![DESCRIPTION](LINK.png)

Logs

Backtrace for this error:
#0  0x7f21a5c49640 in ???
#1  0x7f21a5c48873 in ???
#2  0x7f21a5a5797f in ???
#3  0x412de3 in ???
#4  0x42a143 in ???
#5  0x4015ec in ???
#6  0x7f21a5a40eeb in ???
#7  0x7f21a5a40fb4 in ???
#8  0x401620 in _start
	at ../sysdeps/x86_64/start.S:115
#9  0xffffffffffffffff in ???

OS

Linux