I am trying to simulate the atomisation case in the folder /example. I do not edit any code in the atomisation.c, but restarting the simulation is not possile. The below is the procedure I compile with MPI. 1. qcc -source -D_MPI=1 -grid=quadtree atomisation.c 2. mpicc -Wall -O2 -std=c99 _atomisation.c -o run -L$BASILISK/gl -lglutils -lfb_osmesa -lOSMesa -lGLU -lm and the errors are printed on the screen: [xiaopang-Inspiron-7466:128945] *** Process received signal *** [xiaopang-Inspiron-7466:128945] Signal: Segmentation fault (11) [xiaopang-Inspiron-7466:128945] Signal code: Address not mapped (1) [xiaopang-Inspiron-7466:128945] Failing at address: 0x55c7ed1871c0 [xiaopang-Inspiron-7466:128944] *** Process received signal *** [xiaopang-Inspiron-7466:128944] Signal: Segmentation fault (11) [xiaopang-Inspiron-7466:128944] Signal code: Address not mapped (1) [xiaopang-Inspiron-7466:128944] Failing at address: 0x56a5edab6b40 [xiaopang-Inspiron-7466:128945] [ 0] /lib/x86_64-linux-gnu/libpthread.so.0(+0x143c0)[0x7f5ccf0083c0] [xiaopang-Inspiron-7466:128945] [ 1] ./run(+0x3d95b)[0x556beb6f695b] [xiaopang-Inspiron-7466:128945] [ 2] ./run(+0x3f84c)[0x556beb6f884c] [xiaopang-Inspiron-7466:128944] [ 0] [xiaopang-Inspiron-7466:128945] [ 3] ./run(+0x49e4a)[0x556beb702e4a] [xiaopang-Inspiron-7466:128945] [ 4] ./run(+0x6088a)[0x556beb71988a] [xiaopang-Inspiron-7466:128945] [ 5] ./run(+0x1aefa)[0x556beb6d3efa] [xiaopang-Inspiron-7466:128945] [ 6] ./run(+0x4a3ad)[0x556beb7033ad] [xiaopang-Inspiron-7466:128945] [ 7] /lib/x86_64-linux-gnu/libpthread.so.0(+0x143c0)[0x7f9798d953c0] [xiaopang-Inspiron-7466:128944] [ 1] ./run(+0x3d95b)[0x5649ebd4495b] [xiaopang-Inspiron-7466:128944] [ 2] ./run(+0x3f84c)[0x5649ebd4684c] ./run(+0x7198)[0x556beb6c0198] [xiaopang-Inspiron-7466:128945] [ 8] [xiaopang-Inspiron-7466:128944] [ 3] ./run(+0x49e4a)[0x5649ebd50e4a] [xiaopang-Inspiron-7466:128944] [ 4] ./run(+0x6088a)[0x5649ebd6788a] [xiaopang-Inspiron-7466:128944] [ 5] ./run(+0x1aefa)[0x5649ebd21efa] [xiaopang-Inspiron-7466:128944] [ 6] ./run(+0x4a3ad)[0x5649ebd513ad] [xiaopang-Inspiron-7466:128944] [ 7] ./run(+0x7198)[0x5649ebd0e198] [xiaopang-Inspiron-7466:128944] [ 8] /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf3)[0x7f5ccee260b3] [xiaopang-Inspiron-7466:128945] [ 9] ./run(+0x720e)[0x556beb6c020e] [xiaopang-Inspiron-7466:128945] *** End of error message *** /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf3)[0x7f9798bb30b3] [xiaopang-Inspiron-7466:128944] [ 9] ./run(+0x720e)[0x5649ebd0e20e] [xiaopang-Inspiron-7466:128944] *** End of error message *** -------------------------------------------------------------------------- Primary job terminated normally, but 1 process returned a non-zero exit code. Per user-direction, the job has been aborted. -------------------------------------------------------------------------- -------------------------------------------------------------------------- mpirun noticed that process rank 0 with PID 0 on node xiaopang-Inspiron-7466 exited on signal 11 (Segmentation fault). Note that when compiling without mpicc, i.e., running the simulation with one core, it is OK.