An error which is received signal SIGSEGV in an udf file
 

I’ve written an UDF file for the phase change in multiphase flow. VOF model and species transport were applied. The calculation was well converged in the initial several time steps, but an error occurred when the time step came to a specific value. The error is:
Node 1: Process 19654: Received signal SIGSEGV.
After examination, the UDF file could be well complied and loaded. The initialization of calculation is OK. And there is no gradient of macro parameters appeared in the UDF file.
What is the most possible reason to this problem? I need your help. Thanks a lot!

could be everything: mesh, boundary conditions, UDF, material properties.

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