id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
4534	Stack overflow in SimCodeUtil.createAllDiffedSimVars	Francesco Casella	Henning Kiel	"I have a large model with 200.000 equations that gives stack overflow with the standard Linux stack size of 8 MB. The problem is solved by increasing it to 65 MB or more.
{{{
[/build/openmodelica-qI4Plt/openmodelica-1.13.0~dev-86-g73d3087/OMCompiler/Compiler/SimCode/SimCodeMain.mo:440:3-440:155:writable] Error: Internal error Stack overflow in SimCodeMain.generateModelCode...
[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(Expression.isZero)
[bt] #3 /usr/bin/../lib/x86_64-linux-gnu/omc/libOpenModelicaCompiler.so(ExpressionSimplify.simplifyBinaryCommutativeWork)
[bt] #4 /usr/bin/../lib/x86_64-linux-gnu/omc/libOpenModelicaCompiler.so(ExpressionSimplify.simplifyBinaryCommutative)
[bt] #5 /usr/bin/../lib/x86_64-linux-gnu/omc/libOpenModelicaCompiler.so(ExpressionSimplify.simplifyBinary2)
[bt] #6 /usr/bin/../lib/x86_64-linux-gnu/omc/libOpenModelicaCompiler.so(ExpressionSimplify.simplifyBinary)
[bt] #7 /usr/bin/../lib/x86_64-linux-gnu/omc/libOpenModelicaCompiler.so(ExpressionSimplify.simplifyWork)
[bt] #8...9 /usr/bin/../lib/x86_64-linux-gnu/omc/libOpenModelicaCompiler.so(Expression.traverseExpBottomUp)
[bt] #10 /usr/bin/../lib/x86_64-linux-gnu/omc/libOpenModelicaCompiler.so(ExpressionSimplify.simplify1FixP)
[bt] #11 /usr/bin/../lib/x86_64-linux-gnu/omc/libOpenModelicaCompiler.so(ExpressionSimplify.simplify1WithOptions)
[bt] #12 /usr/bin/../lib/x86_64-linux-gnu/omc/libOpenModelicaCompiler.so(ExpressionSimplify.simplify1)
[bt] #13 /usr/bin/../lib/x86_64-linux-gnu/omc/libOpenModelicaCompiler.so(Expression.createResidualExp2)
[bt] #14 /usr/bin/../lib/x86_64-linux-gnu/omc/libOpenModelicaCompiler.so(Expression.createResidualExp)
[bt] #15...1024 /usr/bin/../lib/x86_64-linux-gnu/omc/libOpenModelicaCompiler.so(SimCodeUtil.createNonlinearResidualEquations)
[bt] #1025 [...]
}}}
I can provide the test case, which is not public, for debugging, but maybe you can catch and remove the bad recursion just based on the stack trace."	defect	closed	high	1.13.0	Code Generation		fixed