./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursive-simple/fibo_2calls_4-2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version f470102c Calling Ultimate with: /usr/lib/jvm/java-8-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_a55dafd2-ad6e-4d71-b4ea-677f567b6d23/bin/uautomizer/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/run_dir_a55dafd2-ad6e-4d71-b4ea-677f567b6d23/bin/uautomizer/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_a55dafd2-ad6e-4d71-b4ea-677f567b6d23/bin/uautomizer/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_a55dafd2-ad6e-4d71-b4ea-677f567b6d23/bin/uautomizer/config/AutomizerReach.xml -i ../../sv-benchmarks/c/recursive-simple/fibo_2calls_4-2.c -s /tmp/vcloud-vcloud-master/worker/run_dir_a55dafd2-ad6e-4d71-b4ea-677f567b6d23/bin/uautomizer/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_a55dafd2-ad6e-4d71-b4ea-677f567b6d23/bin/uautomizer --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(__VERIFIER_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 7a7b79fb8a331a00295fb9ddfb653e17bda3c30d ...................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE --- Real Ultimate output --- This is Ultimate 0.1.25-f470102 [2019-12-07 10:10:39,352 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-12-07 10:10:39,353 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-12-07 10:10:39,362 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-12-07 10:10:39,363 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-12-07 10:10:39,363 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-12-07 10:10:39,364 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-12-07 10:10:39,365 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-12-07 10:10:39,367 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-12-07 10:10:39,367 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-12-07 10:10:39,368 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-12-07 10:10:39,369 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-12-07 10:10:39,369 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-12-07 10:10:39,370 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-12-07 10:10:39,370 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-12-07 10:10:39,371 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-12-07 10:10:39,372 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-12-07 10:10:39,373 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-12-07 10:10:39,374 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-12-07 10:10:39,375 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-12-07 10:10:39,377 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-12-07 10:10:39,378 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-12-07 10:10:39,379 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-12-07 10:10:39,379 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-12-07 10:10:39,381 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-12-07 10:10:39,381 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-12-07 10:10:39,381 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-12-07 10:10:39,382 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-12-07 10:10:39,382 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-12-07 10:10:39,383 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-12-07 10:10:39,383 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-12-07 10:10:39,384 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-12-07 10:10:39,384 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-12-07 10:10:39,385 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-12-07 10:10:39,386 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-12-07 10:10:39,386 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-12-07 10:10:39,386 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-12-07 10:10:39,386 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-12-07 10:10:39,387 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-12-07 10:10:39,387 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-12-07 10:10:39,388 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-12-07 10:10:39,388 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_a55dafd2-ad6e-4d71-b4ea-677f567b6d23/bin/uautomizer/config/svcomp-Reach-32bit-Automizer_Default.epf [2019-12-07 10:10:39,401 INFO L113 SettingsManager]: Loading preferences was successful [2019-12-07 10:10:39,401 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-12-07 10:10:39,402 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-12-07 10:10:39,402 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-12-07 10:10:39,402 INFO L138 SettingsManager]: * Use SBE=true [2019-12-07 10:10:39,403 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-12-07 10:10:39,403 INFO L138 SettingsManager]: * sizeof long=4 [2019-12-07 10:10:39,403 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-12-07 10:10:39,403 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-12-07 10:10:39,403 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-12-07 10:10:39,404 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-12-07 10:10:39,404 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-12-07 10:10:39,404 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-12-07 10:10:39,404 INFO L138 SettingsManager]: * sizeof long double=12 [2019-12-07 10:10:39,404 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-12-07 10:10:39,404 INFO L138 SettingsManager]: * Use constant arrays=true [2019-12-07 10:10:39,405 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-12-07 10:10:39,405 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-12-07 10:10:39,405 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-12-07 10:10:39,405 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-12-07 10:10:39,405 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-12-07 10:10:39,406 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-12-07 10:10:39,406 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-12-07 10:10:39,406 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-12-07 10:10:39,406 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-12-07 10:10:39,406 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-12-07 10:10:39,407 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-12-07 10:10:39,407 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-12-07 10:10:39,407 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2019-12-07 10:10:39,407 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_a55dafd2-ad6e-4d71-b4ea-677f567b6d23/bin/uautomizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(__VERIFIER_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 7a7b79fb8a331a00295fb9ddfb653e17bda3c30d [2019-12-07 10:10:39,509 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-12-07 10:10:39,519 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-12-07 10:10:39,522 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-12-07 10:10:39,523 INFO L271 PluginConnector]: Initializing CDTParser... [2019-12-07 10:10:39,523 INFO L275 PluginConnector]: CDTParser initialized [2019-12-07 10:10:39,524 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_a55dafd2-ad6e-4d71-b4ea-677f567b6d23/bin/uautomizer/../../sv-benchmarks/c/recursive-simple/fibo_2calls_4-2.c [2019-12-07 10:10:39,564 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_a55dafd2-ad6e-4d71-b4ea-677f567b6d23/bin/uautomizer/data/874ef6478/e3ec5a0255d34334842968ebdfec2a0e/FLAG93440f48d [2019-12-07 10:10:39,888 INFO L306 CDTParser]: Found 1 translation units. [2019-12-07 10:10:39,888 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_a55dafd2-ad6e-4d71-b4ea-677f567b6d23/sv-benchmarks/c/recursive-simple/fibo_2calls_4-2.c [2019-12-07 10:10:39,892 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_a55dafd2-ad6e-4d71-b4ea-677f567b6d23/bin/uautomizer/data/874ef6478/e3ec5a0255d34334842968ebdfec2a0e/FLAG93440f48d [2019-12-07 10:10:40,334 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_a55dafd2-ad6e-4d71-b4ea-677f567b6d23/bin/uautomizer/data/874ef6478/e3ec5a0255d34334842968ebdfec2a0e [2019-12-07 10:10:40,337 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-12-07 10:10:40,338 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2019-12-07 10:10:40,339 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-12-07 10:10:40,340 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-12-07 10:10:40,343 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-12-07 10:10:40,344 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.12 10:10:40" (1/1) ... [2019-12-07 10:10:40,346 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6fdb8c7a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 10:10:40, skipping insertion in model container [2019-12-07 10:10:40,347 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.12 10:10:40" (1/1) ... [2019-12-07 10:10:40,353 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2019-12-07 10:10:40,366 INFO L178 MainTranslator]: Built tables and reachable declarations [2019-12-07 10:10:40,478 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-12-07 10:10:40,481 INFO L203 MainTranslator]: Completed pre-run [2019-12-07 10:10:40,527 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-12-07 10:10:40,536 INFO L208 MainTranslator]: Completed translation [2019-12-07 10:10:40,536 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 10:10:40 WrapperNode [2019-12-07 10:10:40,536 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-12-07 10:10:40,537 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-12-07 10:10:40,537 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-12-07 10:10:40,537 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2019-12-07 10:10:40,542 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 10:10:40" (1/1) ... [2019-12-07 10:10:40,546 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 10:10:40" (1/1) ... [2019-12-07 10:10:40,557 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-12-07 10:10:40,557 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-12-07 10:10:40,557 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-12-07 10:10:40,557 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-12-07 10:10:40,563 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 10:10:40" (1/1) ... [2019-12-07 10:10:40,563 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 10:10:40" (1/1) ... [2019-12-07 10:10:40,564 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 10:10:40" (1/1) ... [2019-12-07 10:10:40,564 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 10:10:40" (1/1) ... [2019-12-07 10:10:40,565 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 10:10:40" (1/1) ... [2019-12-07 10:10:40,567 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 10:10:40" (1/1) ... [2019-12-07 10:10:40,567 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 10:10:40" (1/1) ... [2019-12-07 10:10:40,568 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-12-07 10:10:40,568 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-12-07 10:10:40,568 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-12-07 10:10:40,569 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-12-07 10:10:40,569 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 10:10:40" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_a55dafd2-ad6e-4d71-b4ea-677f567b6d23/bin/uautomizer/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 [2019-12-07 10:10:40,610 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-12-07 10:10:40,610 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-12-07 10:10:40,610 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2019-12-07 10:10:40,611 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2019-12-07 10:10:40,611 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2019-12-07 10:10:40,611 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2019-12-07 10:10:40,721 INFO L282 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-12-07 10:10:40,721 INFO L287 CfgBuilder]: Removed 4 assume(true) statements. [2019-12-07 10:10:40,722 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.12 10:10:40 BoogieIcfgContainer [2019-12-07 10:10:40,722 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-12-07 10:10:40,723 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-12-07 10:10:40,723 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-12-07 10:10:40,725 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-12-07 10:10:40,725 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.12 10:10:40" (1/3) ... [2019-12-07 10:10:40,725 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1a1880b3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.12 10:10:40, skipping insertion in model container [2019-12-07 10:10:40,726 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 10:10:40" (2/3) ... [2019-12-07 10:10:40,726 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1a1880b3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.12 10:10:40, skipping insertion in model container [2019-12-07 10:10:40,726 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.12 10:10:40" (3/3) ... [2019-12-07 10:10:40,727 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_2calls_4-2.c [2019-12-07 10:10:40,733 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-12-07 10:10:40,737 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-12-07 10:10:40,744 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-12-07 10:10:40,759 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-12-07 10:10:40,759 INFO L374 AbstractCegarLoop]: Hoare is true [2019-12-07 10:10:40,759 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-12-07 10:10:40,759 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-12-07 10:10:40,760 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-12-07 10:10:40,760 INFO L378 AbstractCegarLoop]: Difference is false [2019-12-07 10:10:40,760 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-12-07 10:10:40,760 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-12-07 10:10:40,771 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states. [2019-12-07 10:10:40,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2019-12-07 10:10:40,774 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 10:10:40,775 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-12-07 10:10:40,775 INFO L410 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-07 10:10:40,778 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 10:10:40,779 INFO L82 PathProgramCache]: Analyzing trace with hash 1871295635, now seen corresponding path program 1 times [2019-12-07 10:10:40,784 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-12-07 10:10:40,784 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1532904039] [2019-12-07 10:10:40,785 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 10:10:40,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 10:10:40,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 10:10:40,918 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 10:10:40,918 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1532904039] [2019-12-07 10:10:40,919 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-12-07 10:10:40,919 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2019-12-07 10:10:40,920 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [769360368] [2019-12-07 10:10:40,923 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-12-07 10:10:40,923 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-12-07 10:10:40,931 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-12-07 10:10:40,932 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2019-12-07 10:10:40,933 INFO L87 Difference]: Start difference. First operand 28 states. Second operand 7 states. [2019-12-07 10:10:41,011 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 10:10:41,011 INFO L93 Difference]: Finished difference Result 38 states and 47 transitions. [2019-12-07 10:10:41,012 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-12-07 10:10:41,013 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 9 [2019-12-07 10:10:41,013 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 10:10:41,019 INFO L225 Difference]: With dead ends: 38 [2019-12-07 10:10:41,019 INFO L226 Difference]: Without dead ends: 26 [2019-12-07 10:10:41,021 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2019-12-07 10:10:41,032 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2019-12-07 10:10:41,046 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2019-12-07 10:10:41,047 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2019-12-07 10:10:41,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 33 transitions. [2019-12-07 10:10:41,049 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 33 transitions. Word has length 9 [2019-12-07 10:10:41,049 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 10:10:41,049 INFO L462 AbstractCegarLoop]: Abstraction has 26 states and 33 transitions. [2019-12-07 10:10:41,049 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-12-07 10:10:41,050 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 33 transitions. [2019-12-07 10:10:41,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-12-07 10:10:41,050 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 10:10:41,051 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-12-07 10:10:41,051 INFO L410 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-07 10:10:41,051 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 10:10:41,051 INFO L82 PathProgramCache]: Analyzing trace with hash -1404217650, now seen corresponding path program 1 times [2019-12-07 10:10:41,051 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-12-07 10:10:41,051 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [631263070] [2019-12-07 10:10:41,051 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 10:10:41,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 10:10:41,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 10:10:41,098 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 10:10:41,098 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [631263070] [2019-12-07 10:10:41,098 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-12-07 10:10:41,098 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2019-12-07 10:10:41,098 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1340844919] [2019-12-07 10:10:41,100 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-12-07 10:10:41,100 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-12-07 10:10:41,100 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-12-07 10:10:41,101 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2019-12-07 10:10:41,101 INFO L87 Difference]: Start difference. First operand 26 states and 33 transitions. Second operand 7 states. [2019-12-07 10:10:41,147 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 10:10:41,148 INFO L93 Difference]: Finished difference Result 32 states and 40 transitions. [2019-12-07 10:10:41,148 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-12-07 10:10:41,148 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 10 [2019-12-07 10:10:41,148 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 10:10:41,149 INFO L225 Difference]: With dead ends: 32 [2019-12-07 10:10:41,149 INFO L226 Difference]: Without dead ends: 28 [2019-12-07 10:10:41,150 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2019-12-07 10:10:41,151 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2019-12-07 10:10:41,155 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2019-12-07 10:10:41,156 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2019-12-07 10:10:41,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 33 transitions. [2019-12-07 10:10:41,157 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 33 transitions. Word has length 10 [2019-12-07 10:10:41,157 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 10:10:41,157 INFO L462 AbstractCegarLoop]: Abstraction has 26 states and 33 transitions. [2019-12-07 10:10:41,157 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-12-07 10:10:41,157 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 33 transitions. [2019-12-07 10:10:41,158 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2019-12-07 10:10:41,158 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 10:10:41,159 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-12-07 10:10:41,159 INFO L410 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-07 10:10:41,159 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 10:10:41,159 INFO L82 PathProgramCache]: Analyzing trace with hash -1629927371, now seen corresponding path program 1 times [2019-12-07 10:10:41,159 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-12-07 10:10:41,160 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [726566219] [2019-12-07 10:10:41,160 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 10:10:41,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 10:10:41,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 10:10:41,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 10:10:41,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 10:10:41,253 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-12-07 10:10:41,253 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [726566219] [2019-12-07 10:10:41,254 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [146595570] [2019-12-07 10:10:41,254 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_a55dafd2-ad6e-4d71-b4ea-677f567b6d23/bin/uautomizer/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 10:10:41,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 10:10:41,281 INFO L264 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 6 conjunts are in the unsatisfiable core [2019-12-07 10:10:41,286 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 10:10:41,328 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-12-07 10:10:41,329 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-12-07 10:10:41,329 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 7] total 12 [2019-12-07 10:10:41,329 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [742779792] [2019-12-07 10:10:41,329 INFO L442 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-12-07 10:10:41,330 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-12-07 10:10:41,330 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-12-07 10:10:41,330 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=106, Unknown=0, NotChecked=0, Total=132 [2019-12-07 10:10:41,330 INFO L87 Difference]: Start difference. First operand 26 states and 33 transitions. Second operand 12 states. [2019-12-07 10:10:41,416 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 10:10:41,416 INFO L93 Difference]: Finished difference Result 59 states and 83 transitions. [2019-12-07 10:10:41,417 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-12-07 10:10:41,417 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 22 [2019-12-07 10:10:41,417 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 10:10:41,418 INFO L225 Difference]: With dead ends: 59 [2019-12-07 10:10:41,418 INFO L226 Difference]: Without dead ends: 35 [2019-12-07 10:10:41,419 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2019-12-07 10:10:41,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2019-12-07 10:10:41,423 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 33. [2019-12-07 10:10:41,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2019-12-07 10:10:41,424 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 42 transitions. [2019-12-07 10:10:41,424 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 42 transitions. Word has length 22 [2019-12-07 10:10:41,425 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 10:10:41,425 INFO L462 AbstractCegarLoop]: Abstraction has 33 states and 42 transitions. [2019-12-07 10:10:41,425 INFO L463 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-12-07 10:10:41,425 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 42 transitions. [2019-12-07 10:10:41,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2019-12-07 10:10:41,426 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 10:10:41,426 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-12-07 10:10:41,627 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 10:10:41,627 INFO L410 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-07 10:10:41,627 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 10:10:41,627 INFO L82 PathProgramCache]: Analyzing trace with hash 1285987244, now seen corresponding path program 1 times [2019-12-07 10:10:41,627 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-12-07 10:10:41,628 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1982606474] [2019-12-07 10:10:41,628 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 10:10:41,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 10:10:41,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 10:10:41,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 10:10:41,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 10:10:41,725 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-12-07 10:10:41,725 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1982606474] [2019-12-07 10:10:41,725 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1725231186] [2019-12-07 10:10:41,725 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_a55dafd2-ad6e-4d71-b4ea-677f567b6d23/bin/uautomizer/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 10:10:41,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 10:10:41,745 INFO L264 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 6 conjunts are in the unsatisfiable core [2019-12-07 10:10:41,746 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 10:10:41,769 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-12-07 10:10:41,769 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-12-07 10:10:41,769 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 7] total 12 [2019-12-07 10:10:41,769 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1583067160] [2019-12-07 10:10:41,770 INFO L442 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-12-07 10:10:41,770 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-12-07 10:10:41,770 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-12-07 10:10:41,770 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=106, Unknown=0, NotChecked=0, Total=132 [2019-12-07 10:10:41,770 INFO L87 Difference]: Start difference. First operand 33 states and 42 transitions. Second operand 12 states. [2019-12-07 10:10:41,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 10:10:41,900 INFO L93 Difference]: Finished difference Result 55 states and 78 transitions. [2019-12-07 10:10:41,900 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-12-07 10:10:41,900 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 23 [2019-12-07 10:10:41,901 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 10:10:41,903 INFO L225 Difference]: With dead ends: 55 [2019-12-07 10:10:41,903 INFO L226 Difference]: Without dead ends: 51 [2019-12-07 10:10:41,904 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2019-12-07 10:10:41,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2019-12-07 10:10:41,912 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 48. [2019-12-07 10:10:41,912 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2019-12-07 10:10:41,914 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 68 transitions. [2019-12-07 10:10:41,914 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 68 transitions. Word has length 23 [2019-12-07 10:10:41,915 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 10:10:41,915 INFO L462 AbstractCegarLoop]: Abstraction has 48 states and 68 transitions. [2019-12-07 10:10:41,915 INFO L463 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-12-07 10:10:41,915 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 68 transitions. [2019-12-07 10:10:41,917 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2019-12-07 10:10:41,917 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 10:10:41,917 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-12-07 10:10:42,118 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 10:10:42,118 INFO L410 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-07 10:10:42,119 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 10:10:42,120 INFO L82 PathProgramCache]: Analyzing trace with hash -649262923, now seen corresponding path program 1 times [2019-12-07 10:10:42,120 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-12-07 10:10:42,121 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1946442385] [2019-12-07 10:10:42,121 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 10:10:42,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 10:10:42,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 10:10:42,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 10:10:42,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 10:10:42,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 10:10:42,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 10:10:42,244 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-12-07 10:10:42,244 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1946442385] [2019-12-07 10:10:42,244 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [98981279] [2019-12-07 10:10:42,244 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_a55dafd2-ad6e-4d71-b4ea-677f567b6d23/bin/uautomizer/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 10:10:42,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 10:10:42,266 INFO L264 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 8 conjunts are in the unsatisfiable core [2019-12-07 10:10:42,267 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 10:10:42,308 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2019-12-07 10:10:42,308 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-12-07 10:10:42,309 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8] total 14 [2019-12-07 10:10:42,309 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1572580598] [2019-12-07 10:10:42,309 INFO L442 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-12-07 10:10:42,309 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-12-07 10:10:42,310 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-12-07 10:10:42,310 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=152, Unknown=0, NotChecked=0, Total=182 [2019-12-07 10:10:42,310 INFO L87 Difference]: Start difference. First operand 48 states and 68 transitions. Second operand 14 states. [2019-12-07 10:10:42,555 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 10:10:42,555 INFO L93 Difference]: Finished difference Result 114 states and 187 transitions. [2019-12-07 10:10:42,555 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-12-07 10:10:42,556 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 35 [2019-12-07 10:10:42,556 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 10:10:42,557 INFO L225 Difference]: With dead ends: 114 [2019-12-07 10:10:42,557 INFO L226 Difference]: Without dead ends: 68 [2019-12-07 10:10:42,559 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2019-12-07 10:10:42,559 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2019-12-07 10:10:42,566 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 66. [2019-12-07 10:10:42,566 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2019-12-07 10:10:42,568 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 98 transitions. [2019-12-07 10:10:42,568 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 98 transitions. Word has length 35 [2019-12-07 10:10:42,568 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 10:10:42,568 INFO L462 AbstractCegarLoop]: Abstraction has 66 states and 98 transitions. [2019-12-07 10:10:42,568 INFO L463 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-12-07 10:10:42,568 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 98 transitions. [2019-12-07 10:10:42,570 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2019-12-07 10:10:42,570 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 10:10:42,570 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-12-07 10:10:42,771 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 10:10:42,771 INFO L410 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-07 10:10:42,772 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 10:10:42,772 INFO L82 PathProgramCache]: Analyzing trace with hash 2000747716, now seen corresponding path program 1 times [2019-12-07 10:10:42,773 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-12-07 10:10:42,773 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1557797823] [2019-12-07 10:10:42,773 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 10:10:42,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 10:10:42,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 10:10:42,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 10:10:42,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 10:10:42,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 10:10:42,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 10:10:42,894 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 7 proven. 3 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2019-12-07 10:10:42,894 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1557797823] [2019-12-07 10:10:42,894 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [331988559] [2019-12-07 10:10:42,895 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_a55dafd2-ad6e-4d71-b4ea-677f567b6d23/bin/uautomizer/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 10:10:42,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 10:10:42,925 INFO L264 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 8 conjunts are in the unsatisfiable core [2019-12-07 10:10:42,927 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 10:10:42,987 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-12-07 10:10:42,988 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-12-07 10:10:42,988 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 14 [2019-12-07 10:10:42,988 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1105200527] [2019-12-07 10:10:42,988 INFO L442 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-12-07 10:10:42,989 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-12-07 10:10:42,989 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-12-07 10:10:42,989 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=151, Unknown=0, NotChecked=0, Total=182 [2019-12-07 10:10:42,989 INFO L87 Difference]: Start difference. First operand 66 states and 98 transitions. Second operand 14 states. [2019-12-07 10:10:43,183 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 10:10:43,183 INFO L93 Difference]: Finished difference Result 147 states and 239 transitions. [2019-12-07 10:10:43,184 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2019-12-07 10:10:43,184 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 36 [2019-12-07 10:10:43,184 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 10:10:43,185 INFO L225 Difference]: With dead ends: 147 [2019-12-07 10:10:43,185 INFO L226 Difference]: Without dead ends: 83 [2019-12-07 10:10:43,187 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=64, Invalid=278, Unknown=0, NotChecked=0, Total=342 [2019-12-07 10:10:43,188 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2019-12-07 10:10:43,196 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 66. [2019-12-07 10:10:43,196 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2019-12-07 10:10:43,197 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 96 transitions. [2019-12-07 10:10:43,197 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 96 transitions. Word has length 36 [2019-12-07 10:10:43,197 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 10:10:43,197 INFO L462 AbstractCegarLoop]: Abstraction has 66 states and 96 transitions. [2019-12-07 10:10:43,197 INFO L463 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-12-07 10:10:43,198 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 96 transitions. [2019-12-07 10:10:43,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2019-12-07 10:10:43,200 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 10:10:43,200 INFO L410 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-12-07 10:10:43,400 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 10:10:43,401 INFO L410 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-07 10:10:43,401 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 10:10:43,402 INFO L82 PathProgramCache]: Analyzing trace with hash -434541687, now seen corresponding path program 1 times [2019-12-07 10:10:43,402 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-12-07 10:10:43,402 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [945404603] [2019-12-07 10:10:43,403 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 10:10:43,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 10:10:43,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 10:10:43,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 10:10:43,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 10:10:43,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 10:10:43,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 10:10:43,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 10:10:43,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 10:10:43,554 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 6 proven. 11 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2019-12-07 10:10:43,554 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [945404603] [2019-12-07 10:10:43,554 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1062861311] [2019-12-07 10:10:43,554 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_a55dafd2-ad6e-4d71-b4ea-677f567b6d23/bin/uautomizer/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 10:10:43,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 10:10:43,577 INFO L264 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 8 conjunts are in the unsatisfiable core [2019-12-07 10:10:43,579 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 10:10:43,627 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 12 proven. 12 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2019-12-07 10:10:43,627 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-12-07 10:10:43,627 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 8] total 17 [2019-12-07 10:10:43,628 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1175991425] [2019-12-07 10:10:43,628 INFO L442 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-12-07 10:10:43,628 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-12-07 10:10:43,629 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-12-07 10:10:43,629 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2019-12-07 10:10:43,629 INFO L87 Difference]: Start difference. First operand 66 states and 96 transitions. Second operand 17 states. [2019-12-07 10:10:43,841 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 10:10:43,841 INFO L93 Difference]: Finished difference Result 163 states and 263 transitions. [2019-12-07 10:10:43,841 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-12-07 10:10:43,841 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 50 [2019-12-07 10:10:43,842 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 10:10:43,843 INFO L225 Difference]: With dead ends: 163 [2019-12-07 10:10:43,843 INFO L226 Difference]: Without dead ends: 99 [2019-12-07 10:10:43,844 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=84, Invalid=422, Unknown=0, NotChecked=0, Total=506 [2019-12-07 10:10:43,844 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2019-12-07 10:10:43,853 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 91. [2019-12-07 10:10:43,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2019-12-07 10:10:43,854 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 143 transitions. [2019-12-07 10:10:43,854 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 143 transitions. Word has length 50 [2019-12-07 10:10:43,854 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 10:10:43,854 INFO L462 AbstractCegarLoop]: Abstraction has 91 states and 143 transitions. [2019-12-07 10:10:43,854 INFO L463 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-12-07 10:10:43,854 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 143 transitions. [2019-12-07 10:10:43,856 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2019-12-07 10:10:43,856 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 10:10:43,856 INFO L410 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-12-07 10:10:44,057 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 10:10:44,058 INFO L410 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-07 10:10:44,058 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 10:10:44,059 INFO L82 PathProgramCache]: Analyzing trace with hash -751947822, now seen corresponding path program 1 times [2019-12-07 10:10:44,059 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-12-07 10:10:44,060 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [813142753] [2019-12-07 10:10:44,060 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 10:10:44,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 10:10:44,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 10:10:44,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 10:10:44,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 10:10:44,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 10:10:44,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 10:10:44,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 10:10:44,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 10:10:44,195 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 19 proven. 11 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-12-07 10:10:44,195 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [813142753] [2019-12-07 10:10:44,195 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [783066723] [2019-12-07 10:10:44,196 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_a55dafd2-ad6e-4d71-b4ea-677f567b6d23/bin/uautomizer/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 10:10:44,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 10:10:44,217 INFO L264 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 6 conjunts are in the unsatisfiable core [2019-12-07 10:10:44,219 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 10:10:44,252 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 18 proven. 5 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-12-07 10:10:44,253 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-12-07 10:10:44,253 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 7] total 15 [2019-12-07 10:10:44,253 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [537713766] [2019-12-07 10:10:44,253 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-12-07 10:10:44,254 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-12-07 10:10:44,254 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-12-07 10:10:44,254 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2019-12-07 10:10:44,254 INFO L87 Difference]: Start difference. First operand 91 states and 143 transitions. Second operand 15 states. [2019-12-07 10:10:44,441 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 10:10:44,441 INFO L93 Difference]: Finished difference Result 182 states and 293 transitions. [2019-12-07 10:10:44,441 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2019-12-07 10:10:44,441 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 51 [2019-12-07 10:10:44,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 10:10:44,442 INFO L225 Difference]: With dead ends: 182 [2019-12-07 10:10:44,442 INFO L226 Difference]: Without dead ends: 91 [2019-12-07 10:10:44,443 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=73, Invalid=307, Unknown=0, NotChecked=0, Total=380 [2019-12-07 10:10:44,444 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2019-12-07 10:10:44,452 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 83. [2019-12-07 10:10:44,453 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2019-12-07 10:10:44,454 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 123 transitions. [2019-12-07 10:10:44,454 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 123 transitions. Word has length 51 [2019-12-07 10:10:44,455 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 10:10:44,455 INFO L462 AbstractCegarLoop]: Abstraction has 83 states and 123 transitions. [2019-12-07 10:10:44,455 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-12-07 10:10:44,455 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 123 transitions. [2019-12-07 10:10:44,456 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2019-12-07 10:10:44,456 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 10:10:44,457 INFO L410 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2019-12-07 10:10:44,657 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 10:10:44,658 INFO L410 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-07 10:10:44,659 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 10:10:44,659 INFO L82 PathProgramCache]: Analyzing trace with hash 629760405, now seen corresponding path program 2 times [2019-12-07 10:10:44,659 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-12-07 10:10:44,660 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1060369613] [2019-12-07 10:10:44,660 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 10:10:44,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 10:10:44,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 10:10:44,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 10:10:44,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 10:10:44,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 10:10:44,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 10:10:44,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 10:10:44,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 10:10:44,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 10:10:44,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 10:10:44,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 10:10:44,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 10:10:44,930 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 31 proven. 51 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2019-12-07 10:10:44,930 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1060369613] [2019-12-07 10:10:44,930 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [180803346] [2019-12-07 10:10:44,930 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_a55dafd2-ad6e-4d71-b4ea-677f567b6d23/bin/uautomizer/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 10:10:44,958 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-12-07 10:10:44,958 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-12-07 10:10:44,958 INFO L264 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 9 conjunts are in the unsatisfiable core [2019-12-07 10:10:44,961 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 10:10:45,027 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 44 proven. 17 refuted. 0 times theorem prover too weak. 71 trivial. 0 not checked. [2019-12-07 10:10:45,027 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-12-07 10:10:45,027 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 9] total 22 [2019-12-07 10:10:45,028 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [767021811] [2019-12-07 10:10:45,028 INFO L442 AbstractCegarLoop]: Interpolant automaton has 22 states [2019-12-07 10:10:45,028 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-12-07 10:10:45,028 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2019-12-07 10:10:45,029 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=398, Unknown=0, NotChecked=0, Total=462 [2019-12-07 10:10:45,029 INFO L87 Difference]: Start difference. First operand 83 states and 123 transitions. Second operand 22 states. [2019-12-07 10:10:45,296 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 10:10:45,296 INFO L93 Difference]: Finished difference Result 189 states and 316 transitions. [2019-12-07 10:10:45,296 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-12-07 10:10:45,296 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 78 [2019-12-07 10:10:45,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 10:10:45,298 INFO L225 Difference]: With dead ends: 189 [2019-12-07 10:10:45,298 INFO L226 Difference]: Without dead ends: 100 [2019-12-07 10:10:45,299 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 94 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 144 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=119, Invalid=637, Unknown=0, NotChecked=0, Total=756 [2019-12-07 10:10:45,299 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2019-12-07 10:10:45,305 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 87. [2019-12-07 10:10:45,305 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2019-12-07 10:10:45,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 120 transitions. [2019-12-07 10:10:45,306 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 120 transitions. Word has length 78 [2019-12-07 10:10:45,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 10:10:45,306 INFO L462 AbstractCegarLoop]: Abstraction has 87 states and 120 transitions. [2019-12-07 10:10:45,306 INFO L463 AbstractCegarLoop]: Interpolant automaton has 22 states. [2019-12-07 10:10:45,306 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 120 transitions. [2019-12-07 10:10:45,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2019-12-07 10:10:45,307 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 10:10:45,307 INFO L410 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-12-07 10:10:45,508 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 10:10:45,508 INFO L410 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-07 10:10:45,509 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 10:10:45,509 INFO L82 PathProgramCache]: Analyzing trace with hash -26046796, now seen corresponding path program 1 times [2019-12-07 10:10:45,509 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-12-07 10:10:45,510 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1786805571] [2019-12-07 10:10:45,510 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 10:10:45,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-12-07 10:10:45,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-12-07 10:10:45,575 INFO L174 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2019-12-07 10:10:45,575 INFO L475 BasicCegarLoop]: Counterexample might be feasible [2019-12-07 10:10:45,606 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 07.12 10:10:45 BoogieIcfgContainer [2019-12-07 10:10:45,607 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2019-12-07 10:10:45,607 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2019-12-07 10:10:45,607 INFO L271 PluginConnector]: Initializing Witness Printer... [2019-12-07 10:10:45,607 INFO L275 PluginConnector]: Witness Printer initialized [2019-12-07 10:10:45,607 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.12 10:10:40" (3/4) ... [2019-12-07 10:10:45,609 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2019-12-07 10:10:45,644 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_a55dafd2-ad6e-4d71-b4ea-677f567b6d23/bin/uautomizer/witness.graphml [2019-12-07 10:10:45,645 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2019-12-07 10:10:45,646 INFO L168 Benchmark]: Toolchain (without parser) took 5307.78 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 128.5 MB). Free memory was 940.9 MB in the beginning and 918.9 MB in the end (delta: 21.9 MB). Peak memory consumption was 150.4 MB. Max. memory is 11.5 GB. [2019-12-07 10:10:45,646 INFO L168 Benchmark]: CDTParser took 0.19 ms. Allocated memory is still 1.0 GB. Free memory is still 955.9 MB. There was no memory consumed. Max. memory is 11.5 GB. [2019-12-07 10:10:45,647 INFO L168 Benchmark]: CACSL2BoogieTranslator took 196.88 ms. Allocated memory was 1.0 GB in the beginning and 1.1 GB in the end (delta: 85.5 MB). Free memory was 940.9 MB in the beginning and 1.1 GB in the end (delta: -142.2 MB). Peak memory consumption was 23.0 MB. Max. memory is 11.5 GB. [2019-12-07 10:10:45,647 INFO L168 Benchmark]: Boogie Procedure Inliner took 20.27 ms. Allocated memory is still 1.1 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB. [2019-12-07 10:10:45,647 INFO L168 Benchmark]: Boogie Preprocessor took 11.25 ms. Allocated memory is still 1.1 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 2.7 MB). Peak memory consumption was 2.7 MB. Max. memory is 11.5 GB. [2019-12-07 10:10:45,647 INFO L168 Benchmark]: RCFGBuilder took 153.98 ms. Allocated memory is still 1.1 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 17.6 MB). Peak memory consumption was 17.6 MB. Max. memory is 11.5 GB. [2019-12-07 10:10:45,648 INFO L168 Benchmark]: TraceAbstraction took 4883.70 ms. Allocated memory was 1.1 GB in the beginning and 1.2 GB in the end (delta: 43.0 MB). Free memory was 1.1 GB in the beginning and 921.0 MB in the end (delta: 141.8 MB). Peak memory consumption was 184.8 MB. Max. memory is 11.5 GB. [2019-12-07 10:10:45,648 INFO L168 Benchmark]: Witness Printer took 37.77 ms. Allocated memory is still 1.2 GB. Free memory was 921.0 MB in the beginning and 918.9 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 11.5 GB. [2019-12-07 10:10:45,649 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.19 ms. Allocated memory is still 1.0 GB. Free memory is still 955.9 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 196.88 ms. Allocated memory was 1.0 GB in the beginning and 1.1 GB in the end (delta: 85.5 MB). Free memory was 940.9 MB in the beginning and 1.1 GB in the end (delta: -142.2 MB). Peak memory consumption was 23.0 MB. Max. memory is 11.5 GB. * Boogie Procedure Inliner took 20.27 ms. Allocated memory is still 1.1 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB. * Boogie Preprocessor took 11.25 ms. Allocated memory is still 1.1 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 2.7 MB). Peak memory consumption was 2.7 MB. Max. memory is 11.5 GB. * RCFGBuilder took 153.98 ms. Allocated memory is still 1.1 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 17.6 MB). Peak memory consumption was 17.6 MB. Max. memory is 11.5 GB. * TraceAbstraction took 4883.70 ms. Allocated memory was 1.1 GB in the beginning and 1.2 GB in the end (delta: 43.0 MB). Free memory was 1.1 GB in the beginning and 921.0 MB in the end (delta: 141.8 MB). Peak memory consumption was 184.8 MB. Max. memory is 11.5 GB. * Witness Printer took 37.77 ms. Allocated memory is still 1.2 GB. Free memory was 921.0 MB in the beginning and 918.9 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 39]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L36] int x = 4; [L37] CALL, EXPR fibo1(x) VAL [\old(n)=4] [L8] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L10] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=3] [L18] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L20] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=2] [L8] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L10] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=2, fibo2(n-1)=1, n=2] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=0] [L18] COND TRUE n < 1 [L19] return 0; VAL [\old(n)=0, \result=0, n=0] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=2, fibo2(n-1)=1, fibo2(n-2)=0, n=2] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=3, fibo1(n-1)=1, n=3] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=3, fibo1(n-1)=1, fibo1(n-2)=1, n=3] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=4, fibo2(n-1)=2, n=4] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=2] [L18] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L20] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=2, fibo1(n-1)=1, n=2] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=0] [L8] COND TRUE n < 1 [L9] return 0; VAL [\old(n)=0, \result=0, n=0] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=2, fibo1(n-1)=1, fibo1(n-2)=0, n=2] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=4, fibo2(n-1)=2, fibo2(n-2)=1, n=4] [L13] return fibo2(n-1) + fibo2(n-2); [L37] RET, EXPR fibo1(x) [L37] int result = fibo1(x); [L38] COND TRUE result == 3 [L39] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 3 procedures, 28 locations, 1 error locations. Result: UNSAFE, OverallTime: 4.8s, OverallIterations: 10, TraceHistogramMax: 6, AutomataDifference: 1.4s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, HoareTripleCheckerStatistics: 210 SDtfs, 383 SDslu, 1378 SDs, 0 SdLazy, 2102 SolverSat, 296 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.8s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 503 GetRequests, 366 SyntacticMatches, 1 SemanticMatches, 136 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 353 ImplicationChecksByTransitivity, 0.9s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=91occurred in iteration=7, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 9 MinimizatonAttempts, 55 StatesRemovedByMinimization, 8 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 1.2s InterpolantComputationTime, 673 NumberOfCodeBlocks, 673 NumberOfCodeBlocksAsserted, 18 NumberOfCheckSat, 593 ConstructedInterpolants, 0 QuantifiedInterpolants, 60425 SizeOfPredicates, 25 NumberOfNonLiveVariables, 676 ConjunctsInSsa, 51 ConjunctsInUnsatCore, 16 InterpolantComputations, 2 PerfectInterpolantSequences, 378/526 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...