[cjc96]

Hey!
I hope everyone is keeping safe :-)

I've been working on a custom Lagrangian solver (OpenFOAM 7) as part of the early stages of my PhD and have reached the point where I am happy with its functionality but am struggling to clean up a last niggling issue, the titular 'double free or corruption (!prev)' error that crashes the solver on completion. It doesn't actually impact the results but isn't something I am happy to leave alone either.

Initially, I only had user-modified versions of lagrangian/intermediate and lagrangian/turbulence and had no issues, it was modifying my own lagrangian/basic that introduced the issue

The (parallel) error in question is as follows:

[LNX-TTCJC-1:23178] *** Process received signal ***
[LNX-TTCJC-1:23178] Signal: Aborted (6)
[LNX-TTCJC-1:23178] Signal code:  (-6)
[LNX-TTCJC-1:23177] *** Process received signal ***
[LNX-TTCJC-1:23177] Signal: Aborted (6)
[LNX-TTCJC-1:23177] Signal code:  (-6)
[LNX-TTCJC-1:23178] [LNX-TTCJC-1:23177] [ 0] /lib/x86_64-linux-gnu/libc.so.6(+0x3ef20)[0x7f262bae7f20]
[LNX-TTCJC-1:23177] [ 1] /lib/x86_64-linux-gnu/libc.so.6(gsignal+0xc7)[0x7f262bae7e97]
[LNX-TTCJC-1:23177] [ 2] /lib/x86_64-linux-gnu/libc.so.6(abort+0x141)[0x7f262bae9801]
[LNX-TTCJC-1:23177] [ 3] [ 0] /lib/x86_64-linux-gnu/libc.so.6(+0x89897)[0x7f262bb32897]
[LNX-TTCJC-1:23177] [ 4] /lib/x86_64-linux-gnu/libc.so.6(+0x9090a)[0x7f262bb3990a]
[LNX-TTCJC-1:23177] [ 5] /lib/x86_64-linux-gnu/libc.so.6(cfree+0x534)[0x7f262bb40e84]
[LNX-TTCJC-1:23177] [ 6] /lib/x86_64-linux-gnu/libc.so.6(__cxa_finalize+0xf5)[0x7f262baec615]
[LNX-TTCJC-1:23177] [ 7] /opt/openfoam7/platforms/linux64GccDPInt32Opt/lib/liblagrangian.so(+0xcd23)[0x7f2629ec3d23]
[LNX-TTCJC-1:23177] *** End of error message ***

From my still rudimentary knowledge, I know that the error is due to some aspect of my solver still calling for 'liblagrangian' as opposed to my custom 'liblagrangianCJC' but I've not been able to track down what.

My solver calls on these libraries:

-lturbulenceModels \
-lincompressibleTurbulenceModels \
-lincompressibleTransportModels \
-lfiniteVolume \
-lmeshTools \
-lfvOptions \
-lsampling \
-L$(FOAM_USER_LIBBIN) \
-llagrangianCJC \
-llagrangianIntermediateCJC \
-lregionModels \
-lsurfaceFilmModels

While I know that these libraries call on 'liblagrangian':

functionObjects/field
functionObjects/lagrangian
mesh/snappyHexMesh
lagrangian/spray
lagrangian/intermediate
lagrangian/coalCombustion
lagrangian/solidParticle
lagrangian/molecularDynamics/molecule
lagrangian/DSMC
lagrangian/turbulence
parallel/decompose/decompose
parallel/reconstruct/reconstruct
sampling/Make

So, from my (inexperienced) eyes, the only common libraries there are 'lagrangian/intermediate' and 'sampling'. I already have a custom 'intermediate' library, so I tried compiling my own 'sampling' library to no luck (in fact this introduced an error related to duplicate entries of the various sampling functions)

From there, I identified what libraries call on 'sampling' with the only one common between 'sampling' and 'lagrangian' being 'functionObjects/field' but again this did not resolve the issue, and as far as I can tell nothing calls that so I am at the end of my line of reasoning.

I can only assume I'm totally misunderstanding how the linking of libraries works, so if anyone could provide some insight I'd be immensely grateful!

[cjc96]

Hello again everyone!
I hope you're all still doing well and have returned to some level of normality at least!

Sorry to bump the post but I never did manage to route out the problem and thought I'd have another stab at it while I'm dealing with some HPC downtime, any advice would be deeply appreciated!

[raumpolizei]

Hey Conor,
difficult to say, is that the gdb output? Could be that your intermediate library still refers to the standard lagrangian basic library (and at the same time yours too). You could try:

>> gdb <yourAppName>
>> run
the application will run until it crashes
>> bt


you could also create a simple application and try to reproduce the error. Something like this:

int main(){
  // create all things needed to create a lagrangian cloud
  {
     // create lagrangian cloud object
     Info<< "leaving scope\n";
  }  // end of scope - cloud gets destructed  
Info<< "end\n";
return EXIT_SUCCESS;
}