/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AbstractInterpretationC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf --abstractinterpretationv2.abstract.domain IntervalDomain -i ../../../trunk/examples/svcomp/array-tiling/poly2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-07 04:54:52,255 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-07 04:54:52,257 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-07 04:54:52,275 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-07 04:54:52,276 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-07 04:54:52,277 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-07 04:54:52,279 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-07 04:54:52,291 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-07 04:54:52,293 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-07 04:54:52,295 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-07 04:54:52,298 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-07 04:54:52,298 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-07 04:54:52,298 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-07 04:54:52,300 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-07 04:54:52,302 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-07 04:54:52,303 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-07 04:54:52,304 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-07 04:54:52,306 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-07 04:54:52,308 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-07 04:54:52,313 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-07 04:54:52,316 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-07 04:54:52,319 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-07 04:54:52,322 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-07 04:54:52,323 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-07 04:54:52,326 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-11-07 04:54:52,326 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-11-07 04:54:52,326 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-11-07 04:54:52,328 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-11-07 04:54:52,328 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-11-07 04:54:52,331 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-11-07 04:54:52,331 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-11-07 04:54:52,332 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-11-07 04:54:52,332 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-11-07 04:54:52,333 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-11-07 04:54:52,337 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-11-07 04:54:52,337 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-11-07 04:54:52,338 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-11-07 04:54:52,338 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-11-07 04:54:52,338 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-07 04:54:52,339 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-07 04:54:52,340 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-07 04:54:52,341 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2019-11-07 04:54:52,360 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-07 04:54:52,360 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-07 04:54:52,362 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-07 04:54:52,362 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-07 04:54:52,362 INFO L138 SettingsManager]: * Use SBE=true [2019-11-07 04:54:52,362 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-07 04:54:52,362 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-07 04:54:52,363 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-07 04:54:52,363 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-07 04:54:52,363 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-07 04:54:52,364 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-07 04:54:52,364 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-07 04:54:52,364 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-07 04:54:52,366 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-07 04:54:52,366 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-07 04:54:52,366 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-07 04:54:52,366 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-07 04:54:52,366 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-07 04:54:52,367 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-07 04:54:52,367 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-07 04:54:52,367 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-07 04:54:52,367 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-07 04:54:52,367 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-07 04:54:52,368 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-07 04:54:52,368 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-07 04:54:52,368 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-07 04:54:52,368 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-07 04:54:52,368 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-07 04:54:52,369 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.analysis.abstractinterpretationv2: Abstract domain -> IntervalDomain [2019-11-07 04:54:52,657 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-07 04:54:52,681 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-07 04:54:52,684 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-07 04:54:52,685 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-07 04:54:52,686 INFO L275 PluginConnector]: CDTParser initialized [2019-11-07 04:54:52,687 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-tiling/poly2.c [2019-11-07 04:54:52,757 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d70edc90a/d5fd17c8935a493188e2a5e11d10fe34/FLAG68f32034c [2019-11-07 04:54:53,197 INFO L306 CDTParser]: Found 1 translation units. [2019-11-07 04:54:53,198 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-tiling/poly2.c [2019-11-07 04:54:53,205 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d70edc90a/d5fd17c8935a493188e2a5e11d10fe34/FLAG68f32034c [2019-11-07 04:54:53,568 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d70edc90a/d5fd17c8935a493188e2a5e11d10fe34 [2019-11-07 04:54:53,576 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-07 04:54:53,578 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-07 04:54:53,579 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-07 04:54:53,579 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-07 04:54:53,582 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-07 04:54:53,583 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 04:54:53" (1/1) ... [2019-11-07 04:54:53,586 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@16b3176f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:54:53, skipping insertion in model container [2019-11-07 04:54:53,587 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 04:54:53" (1/1) ... [2019-11-07 04:54:53,594 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-07 04:54:53,610 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-07 04:54:53,804 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 04:54:53,815 INFO L188 MainTranslator]: Completed pre-run [2019-11-07 04:54:53,831 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 04:54:53,846 INFO L192 MainTranslator]: Completed translation [2019-11-07 04:54:53,847 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:54:53 WrapperNode [2019-11-07 04:54:53,847 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-07 04:54:53,848 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-07 04:54:53,848 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-07 04:54:53,848 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-07 04:54:53,860 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:54:53" (1/1) ... [2019-11-07 04:54:53,860 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:54:53" (1/1) ... [2019-11-07 04:54:53,960 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:54:53" (1/1) ... [2019-11-07 04:54:53,960 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:54:53" (1/1) ... [2019-11-07 04:54:53,967 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:54:53" (1/1) ... [2019-11-07 04:54:53,972 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:54:53" (1/1) ... [2019-11-07 04:54:53,974 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:54:53" (1/1) ... [2019-11-07 04:54:53,976 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-07 04:54:53,977 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-07 04:54:53,977 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-07 04:54:53,977 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-07 04:54:53,979 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:54:53" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-07 04:54:54,029 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-07 04:54:54,029 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-07 04:54:54,030 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-11-07 04:54:54,030 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-07 04:54:54,030 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-07 04:54:54,030 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assume [2019-11-07 04:54:54,030 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-11-07 04:54:54,030 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-11-07 04:54:54,031 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2019-11-07 04:54:54,031 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-07 04:54:54,031 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2019-11-07 04:54:54,031 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-11-07 04:54:54,031 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-11-07 04:54:54,031 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-07 04:54:54,031 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-07 04:54:54,032 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-07 04:54:54,335 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-07 04:54:54,336 INFO L284 CfgBuilder]: Removed 3 assume(true) statements. [2019-11-07 04:54:54,337 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 04:54:54 BoogieIcfgContainer [2019-11-07 04:54:54,337 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-07 04:54:54,338 INFO L113 PluginConnector]: ------------------------Abstract Interpretation---------------------------- [2019-11-07 04:54:54,338 INFO L271 PluginConnector]: Initializing Abstract Interpretation... [2019-11-07 04:54:54,339 INFO L275 PluginConnector]: Abstract Interpretation initialized [2019-11-07 04:54:54,339 INFO L185 PluginConnector]: Executing the observer AbstractInterpretationRcfgObserver from plugin Abstract Interpretation for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 04:54:54" (1/1) ... [2019-11-07 04:54:54,363 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-11-07 04:54:54,441 INFO L266 AbstractInterpreter]: Error location(s) were unreachable [2019-11-07 04:54:54,447 INFO L272 AbstractInterpreter]: Visited 12 different actions 12 times. Never merged. Never widened. Performed 27 root evaluator evaluations with a maximum evaluation depth of 4. Performed 27 inverse root evaluator evaluations with a maximum inverse evaluation depth of 4. Never found a fixpoint. Largest state had 28 variables. [2019-11-07 04:54:54,448 INFO L132 PluginConnector]: ------------------------ END Abstract Interpretation---------------------------- [2019-11-07 04:54:54,451 INFO L168 Benchmark]: Toolchain (without parser) took 871.71 ms. Allocated memory was 148.4 MB in the beginning and 205.0 MB in the end (delta: 56.6 MB). Free memory was 106.6 MB in the beginning and 162.2 MB in the end (delta: -55.6 MB). Peak memory consumption was 1.0 MB. Max. memory is 7.1 GB. [2019-11-07 04:54:54,452 INFO L168 Benchmark]: CDTParser took 0.17 ms. Allocated memory is still 148.4 MB. Free memory was 124.7 MB in the beginning and 124.5 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2019-11-07 04:54:54,453 INFO L168 Benchmark]: CACSL2BoogieTranslator took 268.77 ms. Allocated memory is still 148.4 MB. Free memory was 106.1 MB in the beginning and 96.2 MB in the end (delta: 10.0 MB). Peak memory consumption was 10.0 MB. Max. memory is 7.1 GB. [2019-11-07 04:54:54,455 INFO L168 Benchmark]: Boogie Preprocessor took 128.63 ms. Allocated memory was 148.4 MB in the beginning and 205.0 MB in the end (delta: 56.6 MB). Free memory was 96.2 MB in the beginning and 183.3 MB in the end (delta: -87.1 MB). Peak memory consumption was 10.3 MB. Max. memory is 7.1 GB. [2019-11-07 04:54:54,456 INFO L168 Benchmark]: RCFGBuilder took 360.86 ms. Allocated memory is still 205.0 MB. Free memory was 183.3 MB in the beginning and 167.9 MB in the end (delta: 15.5 MB). Peak memory consumption was 15.5 MB. Max. memory is 7.1 GB. [2019-11-07 04:54:54,457 INFO L168 Benchmark]: Abstract Interpretation took 109.78 ms. Allocated memory is still 205.0 MB. Free memory was 167.9 MB in the beginning and 162.2 MB in the end (delta: 5.7 MB). Peak memory consumption was 5.7 MB. Max. memory is 7.1 GB. [2019-11-07 04:54:54,462 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.17 ms. Allocated memory is still 148.4 MB. Free memory was 124.7 MB in the beginning and 124.5 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 268.77 ms. Allocated memory is still 148.4 MB. Free memory was 106.1 MB in the beginning and 96.2 MB in the end (delta: 10.0 MB). Peak memory consumption was 10.0 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 128.63 ms. Allocated memory was 148.4 MB in the beginning and 205.0 MB in the end (delta: 56.6 MB). Free memory was 96.2 MB in the beginning and 183.3 MB in the end (delta: -87.1 MB). Peak memory consumption was 10.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 360.86 ms. Allocated memory is still 205.0 MB. Free memory was 183.3 MB in the beginning and 167.9 MB in the end (delta: 15.5 MB). Peak memory consumption was 15.5 MB. Max. memory is 7.1 GB. * Abstract Interpretation took 109.78 ms. Allocated memory is still 205.0 MB. Free memory was 167.9 MB in the beginning and 162.2 MB in the end (delta: 5.7 MB). Peak memory consumption was 5.7 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.analysis.abstractinterpretationv2: - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - PositiveResult [Line: 3]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location RESULT: Ultimate proved your program to be correct! Received shutdown request...