id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
4392	Stack overflow in calculateStrongComponentJacobians	Francesco Casella	Adrian Pop	"When compiling a model with about 200k equations, I get this error during the performance of calculateStrongComponentJacobians:
{{{
[/build/openmodelica-pVlUNC/openmodelica-1.12.0~dev-633-gd90ff1c/OMCompiler/Compiler/BackEnd/BackendDAEUtil.mo:6963:3-6963:155:writable] Error: Internal error Stack overflow in BackendDAEUtil.getSolvedSystem...
[bt] #1 /usr/bin/../lib/x86_64-linux-gnu/omc/libOpenModelicaRuntimeC.so(mmc_setStacktraceMessages_threadData)
[bt] #2 /usr/bin/../lib/x86_64-linux-gnu/omc/libOpenModelicaCompiler.so(ComponentReference.hashSubscript)
[bt] #3 /usr/bin/../lib/x86_64-linux-gnu/omc/libOpenModelicaCompiler.so(ComponentReference.hashSubscripts2)
[bt] #4 /usr/bin/../lib/x86_64-linux-gnu/omc/libOpenModelicaCompiler.so(ComponentReference.hashSubscripts)
[bt] #5 /usr/bin/../lib/x86_64-linux-gnu/omc/libOpenModelicaCompiler.so(ComponentReference.hashComponentRef)
[bt] #6 /usr/bin/../lib/x86_64-linux-gnu/omc/libOpenModelicaCompiler.so(ComponentReference.hashComponentRefMod)
[bt] #7 /usr/bin/../lib/x86_64-linux-gnu/omc/libOpenModelicaCompiler.so(BackendVariable.getVar2)
[bt] #8 /usr/bin/../lib/x86_64-linux-gnu/omc/libOpenModelicaCompiler.so(BackendVariable.getVarSingle)
[bt] #9...1024 /usr/bin/../lib/x86_64-linux-gnu/omc/libOpenModelicaCompiler.so(SymbolicJacobian.createAllDiffedVars)
[bt] #1025 [...]
}}}

This happens with the standard 8192 kB stack size. If I increase it to 65535 kB it works fine, but I guess this might be a tell-tale sign of a not-too-efficient implementation.

I can provide the test case separately if needed."	defect	closed	high	1.12.0	Backend		fixed		Per Östlund