2018b segmentation fault on macOS Azure DevOps

I'm using 2018b to run a delaunay triangulation script which I have then built using the Compiler SDK and packaged for Java. From this, I then feed in my function arguments, obtain the result and then solve using Google OR-Tools. This workflow works well and on both my Ubuntu 18.04 machine and Mac laptop I encounter no issues.

I'm using an Azure DevOps instance to build my code and I run two jobs: an Ubuntu 16.04 instance and a macOS X Mojave (10.14) instance. Before compiling the code, a script runs which fetches the MATLAB Runtime 9.5 release, installs it and sets the environment variables. Unit tests then run successfully - which test the MATLAB code - and occasionally (1/5 builds) the process fail after the tests have finished - it appears to be when the environment is shutting down.

I have set the MWApplication to start with MWMCROptions NODISPLAY and NOJVM - this has been an attempt to resolve this issue. After using any MATLAB objects I dispose of them and after running the script from the Java library I dispose of the class and terminate the MWApplication. This solution works fine locally on both my machines but ocassionally fails on the build server and causes the macOS job to fail. The script itself has no UI objects within it and only returns the centroids of the calculated triangles, which I can see return fine when the unit tests run.

After the build failing I am presented with the following segmentation fault:

--------------------------------------------------------------------------------
       Segmentation violation detected at Wed Jul 31 18:59:14 2019 +0000
--------------------------------------------------------------------------------

Configuration:
  Crash Decoding           : Disabled - No sandbox or build area path
  Crash Mode               : continue (default)
  Default Encoding         : ISO-8859-1
  Deployed                 : true
  Graphics Driver          : Unknown software 
  MATLAB Architecture      : maci64
  MATLAB Entitlement ID    : <redacted>
  MATLAB Root              : /Users/vsts/agent/2.154.3/work/1/s/libraries/MATLAB/v95
  MATLAB Version           : 9.5.0.944444 (R2018b)
  OpenGL                   : software
  Operating System         : Mac OS Version 10.14.6 (Build 18G84)
  Process ID               : 14437
  Processor ID             : x86 Family 6 Model 58 Stepping 9, GenuineIntel
  Session Key              : <redacted>
  Window System            : None

Fault Count: 1


Abnormal termination

Register State (from fault):
  RAX = 00007fe0cb600000  RBX = 0000000000000029
  RCX = 00007000056ae5b0  RDX = 00007fff68631282
  RSP = 0000000000000002  RBP = 0000000000000002
  RSI = 00007fe0d1efc080  RDI = 0000000000000000

   R8 = 00007000056ae5e0   R9 = 00007fff68631282
  R10 = 0000001800000000  R11 = 00007fe0cb6fc080
  R12 = 00007fe000000003  R13 = 00007fe0d1e52f20
  R14 = 00007fe0cb417678  R15 = 00007fe0cd975250

  RIP = 00007000056ae5d0  RFL = 0000000104c8148b

   CS = 00007fe0cb6f7400   FS = 0000000000000000   GS = 00007fe0d1854a80

Stack Trace (from fault):
[  0] 0x000000010cf8fdd1                           bin/maci64/libmwfl.dylib+00007633 _ZN10foundation4core4diag15stacktrace_base7captureERKNS1_14thread_contextEm+00000049
[  1] 0x000000010cf954b5                           bin/maci64/libmwfl.dylib+00029877 _ZN10foundation4core4test17terminate_handledEv+00006181
[  2] 0x000000010cf939f5                           bin/maci64/libmwfl.dylib+00023029 _ZN10foundation4core4diag13terminate_logEPKcPK17__darwin_ucontext+00000149
[  3] 0x000000012311d67b                          bin/maci64/libmwmcr.dylib+00632443 _Z19mnPrintErrorMessageRKNSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEEE+00012635
[  4] 0x000000012311b207                          bin/maci64/libmwmcr.dylib+00623111 _Z19mnPrintErrorMessageRKNSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEEE+00003303
[  5] 0x0000000123118d64                          bin/maci64/libmwmcr.dylib+00613732 mnFatalSignalHandler+00000148
[  6] 0x00007fff6866eb5d           /usr/lib/system/libsystem_platform.dylib+00019293 _sigtramp+00000029
[  7] 0x00007000056ae090                                   <unknown-module>+00000000
[  8] 0x0000000104c8148b /Library/Java/JavaVirtualMachines/zulu-8.jdk/Contents/Home/jre/lib/server/libjvm.dylib+03286155 jni_DeleteGlobalRef+00000053
[  9] 0x000000010d1d55d3 /Users/vsts/agent/2.154.3/work/1/s/libraries/repo/ortools/libjniortools.jnilib+00435667 _ZN14GlobalRefGuardD2Ev+00000019
[ 10] 0x000000010d1d5785 /Users/vsts/agent/2.154.3/work/1/s/libraries/repo/ortools/libjniortools.jnilib+00436101 _ZNSt3__114__shared_count16__release_sharedEv+00000037
[ 11] 0x000000010d1d573e /Users/vsts/agent/2.154.3/work/1/s/libraries/repo/ortools/libjniortools.jnilib+00436030 _ZNSt3__119__shared_weak_count16__release_sharedEv+00000014
[ 12] 0x000000010d21c1e2 /Users/vsts/agent/2.154.3/work/1/s/libraries/repo/ortools/libjniortools.jnilib+00725474 _ZNSt3__110__function6__funcIZ86Java_com_google_ortools_constraintsolver_mainJNI_RoutingModel_1registerTransitCallbackE4$_95NS_9allocatorIS2_EEFxxxEE18destroy_deallocateEv+00000018
[ 13] 0x000000010e734728 /Users/vsts/agent/2.154.3/work/1/s/libraries/repo/ortools/libortools.dylib+04912936 _ZN19operations_research12RoutingModelD2Ev+00001272
[ 14] 0x000000010d1b5a86 /Users/vsts/agent/2.154.3/work/1/s/libraries/repo/ortools/libjniortools.jnilib+00305798 Java_com_google_ortools_constraintsolver_mainJNI_delete_1RoutingModel+00000022
[ 15] 0x0000000111ab1407                                   <unknown-module>+00000000
[ 16] 0x0000000111aa0ffd                                   <unknown-module>+00000000
[ 17] 0x0000000111aa0ffd                                   <unknown-module>+00000000
[ 18] 0x0000000111e928cc                                   <unknown-module>+00000000

** This crash report has been saved to disk as /Users/vsts/matlab_crash_dump.14437-1 **



MATLAB is exiting because of fatal error

FAILURE: Build failed with an exception.

What I am slightly unsure about is why there are Google OR-Tool function calls in the stack trace.

Could I please have some assistance resolving this?

[Ankriti Sachan]

The crash log contains an unknown-module which could be related to to some third party component/library.framework involved in your workflow.

Please connect with MathWorks Technical Support along with a sample code and reproduction steps to reproduce the crash, for better assistance.