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MATLAB crashes when running in a parallel bash mode

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Alessandro Maria Laspina
Alessandro Maria Laspina on 23 Feb 2021
Hello,
bear with me for a few paragraphs while I explain the background of the problem as this is a meta-programming issue.
I have a bash script that I use to run MATLAB that looks like this:
xargs -P25 -d'\n' -I{} -t matlab -nodisplay -nodesktop -r "try;runinput={};MD_script_DoE_mass_time_RLV_Ncvx_SOCP1_14;end;exit" < MD_list_DoE_mass_time_RLV_Ncvx_SOCP1_14.txt
MD_script_DoE_mass_time_RLV_Ncvx_SOCP1_14 is a script file that contains a process, which uses the input case from MD_list_DoE_mass_time_RLV_Ncvx_SOCP1_14.txt. The bash script is reading line by line this text file, which really just contains numbers in descending order from 1 to 25. The script file then reads this as a variable called runinput and starts the process (I have a table in the matlab script file that gives the inputs to all the other variables of the problem based on a value from 1 to 25).
When I run the bash script, out of all the 25 processes, only 4 make it through. I get a whole bunch of errors for the others that indicate the following:
--------------------------------------------------------------------------------
Assertion detected at Tue Feb 23 09:52:13 2021 +0100
--------------------------------------------------------------------------------
Configuration:
Crash Decoding : Disabled - No sandbox or build area path
Crash Mode : continue (default)
Default Encoding : UTF-8
Deployed : false
GNU C Library : 2.26 stable
Graphics Driver : Unknown software
Graphics card 1 : 0x102b ( 0x102b ) 0x534 Version 0.0.0.0 (0-0-0)
Java Version : Java 1.8.0_202-b08 with Oracle Corporation Java HotSpot(TM) 64-Bit Server VM mixed mode
MATLAB Architecture : glnxa64
MATLAB Entitlement ID : 846377
MATLAB Root : /usr/local/MATLAB/R2020a
MATLAB Version : 9.8.0.1538580 (R2020a) Update 6
OpenGL : software
Operating System : "openSUSE Leap 15.0"
Process ID : 25593
Processor ID : x86 Family 6 Model 63 Stepping 2, GenuineIntel
Session Key : 20b9f250-ca98-4381-93f5-fb19d35701c2
Static TLS mitigation : Disabled: Unnecessary
Window System : No active display
Fault Count: 1
Additional Log Files:
Java Crash Report : /cala/alessandro/hs_error_pid25593.log
Java Log : /cala/alessandro/java.log.25593
Assertion in void {anonymous}::mwJavaAbort() at javainit.cpp line 1395:
Fatal Java Exception. See this file for details: /cala/alessandro/hs_error_pid25593.log
Register State (captured):
RAX = 0000000000000000 RBX = 00007f8c25c400a8
RCX = 000000000000000a RDX = 00007f8c25c1f698
RSP = 00007f8aac223c50 RBP = 00007f8aac224010
RSI = 00007f8c25be5ff6 RDI = 00007f8aac223c60
R8 = 00007f8aac223f24 R9 = 00007f8aac223f24
R10 = 00007f8c25be5ff6 R11 = 00007f8aac2243f0
R12 = 00007f8c25c30028 R13 = 00007f8aac224890
R14 = 00007f8c11604583 R15 = 00007f8c1160f4c0
RIP = 00007f8c25b36a4e EFL = 00007f8aac22416d
CS = 3d38 FS = ac22 GS = 7f8a
Stack Trace (captured):
[ 0] 0x00007f8c25b2d753 /usr/local/MATLAB/R2020a/bin/glnxa64/libmwfl.so+00853843
[ 1] 0x00007f8c25b2d94c /usr/local/MATLAB/R2020a/bin/glnxa64/libmwfl.so+00854348 _ZN10foundation4core4diag15stacktrace_base7captureEm+00000028
[ 2] 0x00007f8c25b32b89 /usr/local/MATLAB/R2020a/bin/glnxa64/libmwfl.so+00875401
[ 3] 0x00007f8c25b32cf0 /usr/local/MATLAB/R2020a/bin/glnxa64/libmwfl.so+00875760
[ 4] 0x00007f8c115b07ee /usr/local/MATLAB/R2020a/bin/glnxa64/matlab_startup_plugins/jmi/../../../../bin/glnxa64/libmwjmi.so+01415150
[ 5] 0x00007f8c08bb2700 /usr/local/MATLAB/R2020a/sys/java/jre/glnxa64/jre/lib/amd64/server/libjvm.so+09496320
[ 6] 0x00007f8c08d77683 /usr/local/MATLAB/R2020a/sys/java/jre/glnxa64/jre/lib/amd64/server/libjvm.so+11351683
[ 7] 0x00007f8c087844c7 /usr/local/MATLAB/R2020a/sys/java/jre/glnxa64/jre/lib/amd64/server/libjvm.so+05113031
[ 8] 0x00007f8c08bb3e86 /usr/local/MATLAB/R2020a/sys/java/jre/glnxa64/jre/lib/amd64/server/libjvm.so+09502342
[ 9] 0x00007f8c08bab74f /usr/local/MATLAB/R2020a/sys/java/jre/glnxa64/jre/lib/amd64/server/libjvm.so+09467727
[ 10] 0x00007f8c08bb53c8 /usr/local/MATLAB/R2020a/sys/java/jre/glnxa64/jre/lib/amd64/server/libjvm.so+09507784
[ 11] 0x00007f8c08d1fc0e /usr/local/MATLAB/R2020a/sys/java/jre/glnxa64/jre/lib/amd64/server/libjvm.so+10992654
[ 12] 0x00007f8c08bb18c2 /usr/local/MATLAB/R2020a/sys/java/jre/glnxa64/jre/lib/amd64/server/libjvm.so+09492674
[ 13] 0x00007f8c2795d569 /lib64/libpthread.so.0+00030057
[ 14] 0x00007f8c270fca2f /lib64/libc.so.6+01018415 clone+00000063
I also get an error on the ssh machine which I have attached since its too long to show here.
What is causing this issue? I have done some sample runs on my laptop with a few different runInput cases and it runs fine. It's a little bit tedious to debug the issue seeing as there are a lot of files involved and I don't run these processes with a GUI.

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