./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loops/invert_string-1.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_a56755ad-104f-4bbc-b34b-7a0078710258/bin/uautomizer/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/run_dir_a56755ad-104f-4bbc-b34b-7a0078710258/bin/uautomizer/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_a56755ad-104f-4bbc-b34b-7a0078710258/bin/uautomizer/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_a56755ad-104f-4bbc-b34b-7a0078710258/bin/uautomizer/config/AutomizerReach.xml -i ../../sv-benchmarks/c/loops/invert_string-1.c -s /tmp/vcloud-vcloud-master/worker/run_dir_a56755ad-104f-4bbc-b34b-7a0078710258/bin/uautomizer/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_a56755ad-104f-4bbc-b34b-7a0078710258/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 4335483d0b28de4d854f33f949d3555a767d1bde ......................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... 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 14:21:54,765 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-12-07 14:21:54,767 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-12-07 14:21:54,776 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-12-07 14:21:54,776 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-12-07 14:21:54,777 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-12-07 14:21:54,778 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-12-07 14:21:54,780 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-12-07 14:21:54,781 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-12-07 14:21:54,782 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-12-07 14:21:54,783 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-12-07 14:21:54,784 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-12-07 14:21:54,784 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-12-07 14:21:54,785 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-12-07 14:21:54,785 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-12-07 14:21:54,786 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-12-07 14:21:54,786 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-12-07 14:21:54,787 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-12-07 14:21:54,788 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-12-07 14:21:54,790 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-12-07 14:21:54,791 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-12-07 14:21:54,792 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-12-07 14:21:54,793 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-12-07 14:21:54,794 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-12-07 14:21:54,795 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-12-07 14:21:54,796 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-12-07 14:21:54,796 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-12-07 14:21:54,796 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-12-07 14:21:54,796 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-12-07 14:21:54,797 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-12-07 14:21:54,797 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-12-07 14:21:54,798 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-12-07 14:21:54,798 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-12-07 14:21:54,799 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-12-07 14:21:54,800 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-12-07 14:21:54,800 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-12-07 14:21:54,800 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-12-07 14:21:54,801 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-12-07 14:21:54,801 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-12-07 14:21:54,802 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-12-07 14:21:54,802 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-12-07 14:21:54,803 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_a56755ad-104f-4bbc-b34b-7a0078710258/bin/uautomizer/config/svcomp-Reach-32bit-Automizer_Default.epf [2019-12-07 14:21:54,812 INFO L113 SettingsManager]: Loading preferences was successful [2019-12-07 14:21:54,813 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-12-07 14:21:54,813 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-12-07 14:21:54,813 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-12-07 14:21:54,814 INFO L138 SettingsManager]: * Use SBE=true [2019-12-07 14:21:54,814 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-12-07 14:21:54,814 INFO L138 SettingsManager]: * sizeof long=4 [2019-12-07 14:21:54,814 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-12-07 14:21:54,814 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-12-07 14:21:54,814 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-12-07 14:21:54,814 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-12-07 14:21:54,814 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-12-07 14:21:54,815 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-12-07 14:21:54,815 INFO L138 SettingsManager]: * sizeof long double=12 [2019-12-07 14:21:54,815 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-12-07 14:21:54,815 INFO L138 SettingsManager]: * Use constant arrays=true [2019-12-07 14:21:54,815 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-12-07 14:21:54,815 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-12-07 14:21:54,815 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-12-07 14:21:54,815 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-12-07 14:21:54,816 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-12-07 14:21:54,816 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-12-07 14:21:54,816 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-12-07 14:21:54,816 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-12-07 14:21:54,816 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-12-07 14:21:54,816 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-12-07 14:21:54,816 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-12-07 14:21:54,816 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-12-07 14:21:54,817 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2019-12-07 14:21:54,817 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_a56755ad-104f-4bbc-b34b-7a0078710258/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 -> 4335483d0b28de4d854f33f949d3555a767d1bde [2019-12-07 14:21:54,916 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-12-07 14:21:54,924 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-12-07 14:21:54,926 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-12-07 14:21:54,928 INFO L271 PluginConnector]: Initializing CDTParser... [2019-12-07 14:21:54,928 INFO L275 PluginConnector]: CDTParser initialized [2019-12-07 14:21:54,929 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_a56755ad-104f-4bbc-b34b-7a0078710258/bin/uautomizer/../../sv-benchmarks/c/loops/invert_string-1.c [2019-12-07 14:21:54,969 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_a56755ad-104f-4bbc-b34b-7a0078710258/bin/uautomizer/data/86a58ca9d/2229205dbfa1412b9ec37e5aeade8603/FLAGdd6aba3d0 [2019-12-07 14:21:55,310 INFO L306 CDTParser]: Found 1 translation units. [2019-12-07 14:21:55,311 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_a56755ad-104f-4bbc-b34b-7a0078710258/sv-benchmarks/c/loops/invert_string-1.c [2019-12-07 14:21:55,315 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_a56755ad-104f-4bbc-b34b-7a0078710258/bin/uautomizer/data/86a58ca9d/2229205dbfa1412b9ec37e5aeade8603/FLAGdd6aba3d0 [2019-12-07 14:21:55,323 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_a56755ad-104f-4bbc-b34b-7a0078710258/bin/uautomizer/data/86a58ca9d/2229205dbfa1412b9ec37e5aeade8603 [2019-12-07 14:21:55,325 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-12-07 14:21:55,326 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2019-12-07 14:21:55,327 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-12-07 14:21:55,327 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-12-07 14:21:55,329 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-12-07 14:21:55,330 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.12 02:21:55" (1/1) ... [2019-12-07 14:21:55,332 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3c8c33a1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 02:21:55, skipping insertion in model container [2019-12-07 14:21:55,332 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.12 02:21:55" (1/1) ... [2019-12-07 14:21:55,337 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2019-12-07 14:21:55,348 INFO L178 MainTranslator]: Built tables and reachable declarations [2019-12-07 14:21:55,452 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-12-07 14:21:55,454 INFO L203 MainTranslator]: Completed pre-run [2019-12-07 14:21:55,510 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-12-07 14:21:55,523 INFO L208 MainTranslator]: Completed translation [2019-12-07 14:21:55,523 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 02:21:55 WrapperNode [2019-12-07 14:21:55,523 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-12-07 14:21:55,524 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-12-07 14:21:55,524 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-12-07 14:21:55,524 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2019-12-07 14:21:55,530 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 02:21:55" (1/1) ... [2019-12-07 14:21:55,535 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 02:21:55" (1/1) ... [2019-12-07 14:21:55,548 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-12-07 14:21:55,548 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-12-07 14:21:55,549 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-12-07 14:21:55,549 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-12-07 14:21:55,555 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 02:21:55" (1/1) ... [2019-12-07 14:21:55,555 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 02:21:55" (1/1) ... [2019-12-07 14:21:55,556 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 02:21:55" (1/1) ... [2019-12-07 14:21:55,556 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 02:21:55" (1/1) ... [2019-12-07 14:21:55,559 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 02:21:55" (1/1) ... [2019-12-07 14:21:55,562 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 02:21:55" (1/1) ... [2019-12-07 14:21:55,563 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 02:21:55" (1/1) ... [2019-12-07 14:21:55,564 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-12-07 14:21:55,565 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-12-07 14:21:55,565 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-12-07 14:21:55,565 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-12-07 14:21:55,566 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 02:21:55" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_a56755ad-104f-4bbc-b34b-7a0078710258/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 14:21:55,605 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-12-07 14:21:55,605 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-12-07 14:21:55,605 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-12-07 14:21:55,605 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-12-07 14:21:55,605 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-12-07 14:21:55,605 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-12-07 14:21:55,739 INFO L282 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-12-07 14:21:55,740 INFO L287 CfgBuilder]: Removed 9 assume(true) statements. [2019-12-07 14:21:55,740 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.12 02:21:55 BoogieIcfgContainer [2019-12-07 14:21:55,741 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-12-07 14:21:55,741 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-12-07 14:21:55,741 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-12-07 14:21:55,743 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-12-07 14:21:55,743 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.12 02:21:55" (1/3) ... [2019-12-07 14:21:55,744 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5c55aaec and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.12 02:21:55, skipping insertion in model container [2019-12-07 14:21:55,744 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 02:21:55" (2/3) ... [2019-12-07 14:21:55,744 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5c55aaec and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.12 02:21:55, skipping insertion in model container [2019-12-07 14:21:55,744 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.12 02:21:55" (3/3) ... [2019-12-07 14:21:55,745 INFO L109 eAbstractionObserver]: Analyzing ICFG invert_string-1.c [2019-12-07 14:21:55,751 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-12-07 14:21:55,755 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-12-07 14:21:55,762 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-12-07 14:21:55,777 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-12-07 14:21:55,777 INFO L374 AbstractCegarLoop]: Hoare is true [2019-12-07 14:21:55,777 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-12-07 14:21:55,777 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-12-07 14:21:55,777 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-12-07 14:21:55,777 INFO L378 AbstractCegarLoop]: Difference is false [2019-12-07 14:21:55,778 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-12-07 14:21:55,778 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-12-07 14:21:55,786 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states. [2019-12-07 14:21:55,790 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2019-12-07 14:21:55,790 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 14:21:55,791 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-12-07 14:21:55,791 INFO L410 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-07 14:21:55,795 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 14:21:55,795 INFO L82 PathProgramCache]: Analyzing trace with hash -2016449835, now seen corresponding path program 1 times [2019-12-07 14:21:55,801 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-12-07 14:21:55,801 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1790881362] [2019-12-07 14:21:55,801 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 14:21:55,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 14:21:55,914 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 14:21:55,914 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1790881362] [2019-12-07 14:21:55,915 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-12-07 14:21:55,915 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-12-07 14:21:55,916 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [539429681] [2019-12-07 14:21:55,918 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-12-07 14:21:55,919 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-12-07 14:21:55,927 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-12-07 14:21:55,927 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-12-07 14:21:55,928 INFO L87 Difference]: Start difference. First operand 18 states. Second operand 4 states. [2019-12-07 14:21:55,974 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 14:21:55,974 INFO L93 Difference]: Finished difference Result 33 states and 45 transitions. [2019-12-07 14:21:55,974 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-12-07 14:21:55,975 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 9 [2019-12-07 14:21:55,975 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 14:21:55,981 INFO L225 Difference]: With dead ends: 33 [2019-12-07 14:21:55,981 INFO L226 Difference]: Without dead ends: 15 [2019-12-07 14:21:55,983 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2019-12-07 14:21:55,994 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2019-12-07 14:21:56,003 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2019-12-07 14:21:56,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2019-12-07 14:21:56,004 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2019-12-07 14:21:56,005 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 9 [2019-12-07 14:21:56,005 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 14:21:56,005 INFO L462 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2019-12-07 14:21:56,005 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-12-07 14:21:56,005 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2019-12-07 14:21:56,006 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2019-12-07 14:21:56,006 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 14:21:56,006 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-12-07 14:21:56,006 INFO L410 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-07 14:21:56,006 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 14:21:56,006 INFO L82 PathProgramCache]: Analyzing trace with hash 867342291, now seen corresponding path program 1 times [2019-12-07 14:21:56,007 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-12-07 14:21:56,007 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [983926488] [2019-12-07 14:21:56,007 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 14:21:56,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 14:21:56,042 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-12-07 14:21:56,042 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [983926488] [2019-12-07 14:21:56,042 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-12-07 14:21:56,042 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-12-07 14:21:56,042 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2065465641] [2019-12-07 14:21:56,043 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-12-07 14:21:56,044 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-12-07 14:21:56,044 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-12-07 14:21:56,044 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-12-07 14:21:56,044 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 3 states. [2019-12-07 14:21:56,060 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 14:21:56,060 INFO L93 Difference]: Finished difference Result 28 states and 32 transitions. [2019-12-07 14:21:56,060 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-12-07 14:21:56,061 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2019-12-07 14:21:56,061 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 14:21:56,061 INFO L225 Difference]: With dead ends: 28 [2019-12-07 14:21:56,061 INFO L226 Difference]: Without dead ends: 17 [2019-12-07 14:21:56,062 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-12-07 14:21:56,062 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2019-12-07 14:21:56,064 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 16. [2019-12-07 14:21:56,064 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2019-12-07 14:21:56,064 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2019-12-07 14:21:56,065 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 11 [2019-12-07 14:21:56,065 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 14:21:56,065 INFO L462 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2019-12-07 14:21:56,065 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-12-07 14:21:56,065 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2019-12-07 14:21:56,065 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-12-07 14:21:56,065 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 14:21:56,065 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-12-07 14:21:56,065 INFO L410 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-07 14:21:56,066 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 14:21:56,066 INFO L82 PathProgramCache]: Analyzing trace with hash 2031054225, now seen corresponding path program 1 times [2019-12-07 14:21:56,066 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-12-07 14:21:56,066 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2044533440] [2019-12-07 14:21:56,066 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 14:21:56,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 14:21:56,349 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 14:21:56,349 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2044533440] [2019-12-07 14:21:56,350 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [998751463] [2019-12-07 14:21:56,350 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_a56755ad-104f-4bbc-b34b-7a0078710258/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 14:21:56,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 14:21:56,382 INFO L264 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 25 conjunts are in the unsatisfiable core [2019-12-07 14:21:56,385 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 14:21:56,420 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2019-12-07 14:21:56,420 INFO L534 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-12-07 14:21:56,426 INFO L614 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-12-07 14:21:56,427 INFO L534 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-12-07 14:21:56,427 INFO L239 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:18, output treesize:14 [2019-12-07 14:21:56,485 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 15 [2019-12-07 14:21:56,485 INFO L534 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-12-07 14:21:56,492 INFO L614 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-12-07 14:21:56,492 INFO L534 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-12-07 14:21:56,493 INFO L239 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:29, output treesize:25 [2019-12-07 14:21:56,533 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-12-07 14:21:56,552 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 14:21:56,552 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-12-07 14:21:56,552 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 16 [2019-12-07 14:21:56,552 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [513057647] [2019-12-07 14:21:56,553 INFO L442 AbstractCegarLoop]: Interpolant automaton has 16 states [2019-12-07 14:21:56,553 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-12-07 14:21:56,553 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2019-12-07 14:21:56,554 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=197, Unknown=0, NotChecked=0, Total=240 [2019-12-07 14:21:56,554 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 16 states. [2019-12-07 14:21:56,984 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 14:21:56,984 INFO L93 Difference]: Finished difference Result 38 states and 42 transitions. [2019-12-07 14:21:56,985 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-12-07 14:21:56,985 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 13 [2019-12-07 14:21:56,985 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 14:21:56,985 INFO L225 Difference]: With dead ends: 38 [2019-12-07 14:21:56,986 INFO L226 Difference]: Without dead ends: 36 [2019-12-07 14:21:56,986 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 107 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=194, Invalid=508, Unknown=0, NotChecked=0, Total=702 [2019-12-07 14:21:56,987 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2019-12-07 14:21:56,990 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 25. [2019-12-07 14:21:56,991 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2019-12-07 14:21:56,991 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 29 transitions. [2019-12-07 14:21:56,991 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 29 transitions. Word has length 13 [2019-12-07 14:21:56,992 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 14:21:56,992 INFO L462 AbstractCegarLoop]: Abstraction has 25 states and 29 transitions. [2019-12-07 14:21:56,992 INFO L463 AbstractCegarLoop]: Interpolant automaton has 16 states. [2019-12-07 14:21:56,992 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 29 transitions. [2019-12-07 14:21:56,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-12-07 14:21:56,992 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 14:21:56,992 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-12-07 14:21:57,193 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 14:21:57,194 INFO L410 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-07 14:21:57,195 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 14:21:57,195 INFO L82 PathProgramCache]: Analyzing trace with hash -628241457, now seen corresponding path program 2 times [2019-12-07 14:21:57,196 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-12-07 14:21:57,197 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [312056730] [2019-12-07 14:21:57,197 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 14:21:57,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 14:21:57,269 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 14:21:57,269 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [312056730] [2019-12-07 14:21:57,269 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [572785431] [2019-12-07 14:21:57,270 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_a56755ad-104f-4bbc-b34b-7a0078710258/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 14:21:57,303 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-12-07 14:21:57,304 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-12-07 14:21:57,304 INFO L264 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 6 conjunts are in the unsatisfiable core [2019-12-07 14:21:57,306 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 14:21:57,310 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 14:21:57,310 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-12-07 14:21:57,310 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 6 [2019-12-07 14:21:57,311 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [881417496] [2019-12-07 14:21:57,311 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-12-07 14:21:57,311 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-12-07 14:21:57,312 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-12-07 14:21:57,312 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2019-12-07 14:21:57,312 INFO L87 Difference]: Start difference. First operand 25 states and 29 transitions. Second operand 6 states. [2019-12-07 14:21:57,379 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 14:21:57,379 INFO L93 Difference]: Finished difference Result 43 states and 48 transitions. [2019-12-07 14:21:57,379 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-12-07 14:21:57,380 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 15 [2019-12-07 14:21:57,380 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 14:21:57,380 INFO L225 Difference]: With dead ends: 43 [2019-12-07 14:21:57,380 INFO L226 Difference]: Without dead ends: 36 [2019-12-07 14:21:57,381 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2019-12-07 14:21:57,381 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2019-12-07 14:21:57,384 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 27. [2019-12-07 14:21:57,384 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2019-12-07 14:21:57,385 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 31 transitions. [2019-12-07 14:21:57,385 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 31 transitions. Word has length 15 [2019-12-07 14:21:57,385 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 14:21:57,385 INFO L462 AbstractCegarLoop]: Abstraction has 27 states and 31 transitions. [2019-12-07 14:21:57,385 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-12-07 14:21:57,385 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 31 transitions. [2019-12-07 14:21:57,386 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-12-07 14:21:57,386 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 14:21:57,386 INFO L410 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-12-07 14:21:57,586 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 14:21:57,587 INFO L410 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-07 14:21:57,588 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 14:21:57,589 INFO L82 PathProgramCache]: Analyzing trace with hash 1786824679, now seen corresponding path program 1 times [2019-12-07 14:21:57,589 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-12-07 14:21:57,590 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [830442327] [2019-12-07 14:21:57,590 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 14:21:57,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 14:21:57,659 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-12-07 14:21:57,660 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [830442327] [2019-12-07 14:21:57,660 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [550385904] [2019-12-07 14:21:57,660 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_a56755ad-104f-4bbc-b34b-7a0078710258/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 14:21:57,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 14:21:57,683 INFO L264 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 6 conjunts are in the unsatisfiable core [2019-12-07 14:21:57,684 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 14:21:57,709 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-12-07 14:21:57,709 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-12-07 14:21:57,709 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 11 [2019-12-07 14:21:57,710 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [670737127] [2019-12-07 14:21:57,710 INFO L442 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-12-07 14:21:57,710 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-12-07 14:21:57,710 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-12-07 14:21:57,710 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=73, Unknown=0, NotChecked=0, Total=110 [2019-12-07 14:21:57,710 INFO L87 Difference]: Start difference. First operand 27 states and 31 transitions. Second operand 11 states. [2019-12-07 14:21:57,797 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 14:21:57,797 INFO L93 Difference]: Finished difference Result 50 states and 54 transitions. [2019-12-07 14:21:57,798 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-12-07 14:21:57,798 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 17 [2019-12-07 14:21:57,798 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 14:21:57,798 INFO L225 Difference]: With dead ends: 50 [2019-12-07 14:21:57,798 INFO L226 Difference]: Without dead ends: 34 [2019-12-07 14:21:57,799 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=70, Invalid=140, Unknown=0, NotChecked=0, Total=210 [2019-12-07 14:21:57,799 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2019-12-07 14:21:57,801 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 20. [2019-12-07 14:21:57,801 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2019-12-07 14:21:57,801 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2019-12-07 14:21:57,801 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 17 [2019-12-07 14:21:57,802 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 14:21:57,802 INFO L462 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2019-12-07 14:21:57,802 INFO L463 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-12-07 14:21:57,802 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2019-12-07 14:21:57,802 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-12-07 14:21:57,802 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 14:21:57,802 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-12-07 14:21:58,003 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 14:21:58,004 INFO L410 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-07 14:21:58,004 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 14:21:58,005 INFO L82 PathProgramCache]: Analyzing trace with hash -799235507, now seen corresponding path program 3 times [2019-12-07 14:21:58,005 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-12-07 14:21:58,006 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1392587813] [2019-12-07 14:21:58,006 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 14:21:58,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 14:21:58,358 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 14:21:58,359 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1392587813] [2019-12-07 14:21:58,359 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1375336092] [2019-12-07 14:21:58,359 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_a56755ad-104f-4bbc-b34b-7a0078710258/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 14:21:58,391 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-12-07 14:21:58,391 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-12-07 14:21:58,392 INFO L264 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 31 conjunts are in the unsatisfiable core [2019-12-07 14:21:58,393 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 14:21:58,398 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2019-12-07 14:21:58,399 INFO L534 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-12-07 14:21:58,411 INFO L614 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-12-07 14:21:58,412 INFO L534 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-12-07 14:21:58,412 INFO L239 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:18, output treesize:14 [2019-12-07 14:21:58,528 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 17 [2019-12-07 14:21:58,528 INFO L534 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-12-07 14:21:58,535 INFO L614 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-12-07 14:21:58,535 INFO L534 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-12-07 14:21:58,535 INFO L239 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:31, output treesize:27 [2019-12-07 14:21:58,579 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-12-07 14:21:58,597 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 14:21:58,597 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-12-07 14:21:58,598 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 22 [2019-12-07 14:21:58,598 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [921503213] [2019-12-07 14:21:58,598 INFO L442 AbstractCegarLoop]: Interpolant automaton has 22 states [2019-12-07 14:21:58,598 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-12-07 14:21:58,598 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2019-12-07 14:21:58,599 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=401, Unknown=0, NotChecked=0, Total=462 [2019-12-07 14:21:58,599 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 22 states. [2019-12-07 14:21:59,318 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 14:21:59,318 INFO L93 Difference]: Finished difference Result 50 states and 54 transitions. [2019-12-07 14:21:59,318 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2019-12-07 14:21:59,318 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 17 [2019-12-07 14:21:59,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 14:21:59,319 INFO L225 Difference]: With dead ends: 50 [2019-12-07 14:21:59,319 INFO L226 Difference]: Without dead ends: 48 [2019-12-07 14:21:59,320 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 258 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=336, Invalid=1224, Unknown=0, NotChecked=0, Total=1560 [2019-12-07 14:21:59,320 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2019-12-07 14:21:59,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 31. [2019-12-07 14:21:59,323 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2019-12-07 14:21:59,324 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2019-12-07 14:21:59,324 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 17 [2019-12-07 14:21:59,324 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 14:21:59,324 INFO L462 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2019-12-07 14:21:59,324 INFO L463 AbstractCegarLoop]: Interpolant automaton has 22 states. [2019-12-07 14:21:59,324 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2019-12-07 14:21:59,324 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2019-12-07 14:21:59,325 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 14:21:59,325 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-12-07 14:21:59,525 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 14:21:59,526 INFO L410 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-07 14:21:59,526 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 14:21:59,527 INFO L82 PathProgramCache]: Analyzing trace with hash 1927655819, now seen corresponding path program 4 times [2019-12-07 14:21:59,527 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-12-07 14:21:59,528 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1325067102] [2019-12-07 14:21:59,528 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 14:21:59,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 14:21:59,595 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 1 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 14:21:59,595 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1325067102] [2019-12-07 14:21:59,595 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1836383653] [2019-12-07 14:21:59,595 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_a56755ad-104f-4bbc-b34b-7a0078710258/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 14:21:59,616 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-12-07 14:21:59,616 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-12-07 14:21:59,617 WARN L262 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 27 conjunts are in the unsatisfiable core [2019-12-07 14:21:59,618 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 14:21:59,635 INFO L343 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2019-12-07 14:21:59,635 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 15 treesize of output 15 [2019-12-07 14:21:59,636 INFO L534 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-12-07 14:21:59,640 INFO L614 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-12-07 14:21:59,640 INFO L534 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-12-07 14:21:59,640 INFO L239 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:24, output treesize:20 [2019-12-07 14:21:59,677 INFO L343 Elim1Store]: treesize reduction 60, result has 20.0 percent of original size [2019-12-07 14:21:59,677 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 29 treesize of output 27 [2019-12-07 14:21:59,678 INFO L534 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-12-07 14:21:59,683 INFO L614 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-12-07 14:21:59,683 INFO L534 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-12-07 14:21:59,683 INFO L239 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:37, output treesize:35 [2019-12-07 14:21:59,747 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-12-07 14:21:59,760 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-12-07 14:21:59,761 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-12-07 14:21:59,761 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 10] total 15 [2019-12-07 14:21:59,761 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [806274901] [2019-12-07 14:21:59,761 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-12-07 14:21:59,761 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-12-07 14:21:59,761 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-12-07 14:21:59,761 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=175, Unknown=0, NotChecked=0, Total=210 [2019-12-07 14:21:59,762 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand 15 states. [2019-12-07 14:22:00,322 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 14:22:00,322 INFO L93 Difference]: Finished difference Result 77 states and 83 transitions. [2019-12-07 14:22:00,322 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2019-12-07 14:22:00,322 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 19 [2019-12-07 14:22:00,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 14:22:00,323 INFO L225 Difference]: With dead ends: 77 [2019-12-07 14:22:00,323 INFO L226 Difference]: Without dead ends: 67 [2019-12-07 14:22:00,324 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 187 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=182, Invalid=874, Unknown=0, NotChecked=0, Total=1056 [2019-12-07 14:22:00,324 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2019-12-07 14:22:00,329 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 42. [2019-12-07 14:22:00,329 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2019-12-07 14:22:00,330 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 47 transitions. [2019-12-07 14:22:00,330 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 47 transitions. Word has length 19 [2019-12-07 14:22:00,330 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 14:22:00,330 INFO L462 AbstractCegarLoop]: Abstraction has 42 states and 47 transitions. [2019-12-07 14:22:00,330 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-12-07 14:22:00,331 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 47 transitions. [2019-12-07 14:22:00,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2019-12-07 14:22:00,331 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 14:22:00,331 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-12-07 14:22:00,532 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 14:22:00,533 INFO L410 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-07 14:22:00,533 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 14:22:00,534 INFO L82 PathProgramCache]: Analyzing trace with hash 980237987, now seen corresponding path program 2 times [2019-12-07 14:22:00,534 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-12-07 14:22:00,535 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1786708677] [2019-12-07 14:22:00,535 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 14:22:00,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-12-07 14:22:00,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-12-07 14:22:00,583 INFO L174 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2019-12-07 14:22:00,583 INFO L475 BasicCegarLoop]: Counterexample might be feasible [2019-12-07 14:22:00,604 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 07.12 02:22:00 BoogieIcfgContainer [2019-12-07 14:22:00,604 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2019-12-07 14:22:00,605 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2019-12-07 14:22:00,605 INFO L271 PluginConnector]: Initializing Witness Printer... [2019-12-07 14:22:00,605 INFO L275 PluginConnector]: Witness Printer initialized [2019-12-07 14:22:00,605 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.12 02:21:55" (3/4) ... [2019-12-07 14:22:00,607 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2019-12-07 14:22:00,642 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_a56755ad-104f-4bbc-b34b-7a0078710258/bin/uautomizer/witness.graphml [2019-12-07 14:22:00,642 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2019-12-07 14:22:00,643 INFO L168 Benchmark]: Toolchain (without parser) took 5316.95 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 141.0 MB). Free memory was 940.8 MB in the beginning and 831.2 MB in the end (delta: 109.6 MB). Peak memory consumption was 250.7 MB. Max. memory is 11.5 GB. [2019-12-07 14:22:00,643 INFO L168 Benchmark]: CDTParser took 0.21 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 14:22:00,644 INFO L168 Benchmark]: CACSL2BoogieTranslator took 196.79 ms. Allocated memory was 1.0 GB in the beginning and 1.1 GB in the end (delta: 103.3 MB). Free memory was 940.8 MB in the beginning and 1.1 GB in the end (delta: -156.1 MB). Peak memory consumption was 23.5 MB. Max. memory is 11.5 GB. [2019-12-07 14:22:00,644 INFO L168 Benchmark]: Boogie Procedure Inliner took 24.51 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 14:22:00,644 INFO L168 Benchmark]: Boogie Preprocessor took 16.08 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 14:22:00,644 INFO L168 Benchmark]: RCFGBuilder took 175.52 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: 21.9 MB). Peak memory consumption was 21.9 MB. Max. memory is 11.5 GB. [2019-12-07 14:22:00,645 INFO L168 Benchmark]: TraceAbstraction took 4863.35 ms. Allocated memory was 1.1 GB in the beginning and 1.2 GB in the end (delta: 37.7 MB). Free memory was 1.1 GB in the beginning and 831.6 MB in the end (delta: 243.4 MB). Peak memory consumption was 281.2 MB. Max. memory is 11.5 GB. [2019-12-07 14:22:00,645 INFO L168 Benchmark]: Witness Printer took 37.30 ms. Allocated memory is still 1.2 GB. Free memory was 831.6 MB in the beginning and 831.2 MB in the end (delta: 385.9 kB). Peak memory consumption was 385.9 kB. Max. memory is 11.5 GB. [2019-12-07 14:22:00,647 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 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 196.79 ms. Allocated memory was 1.0 GB in the beginning and 1.1 GB in the end (delta: 103.3 MB). Free memory was 940.8 MB in the beginning and 1.1 GB in the end (delta: -156.1 MB). Peak memory consumption was 23.5 MB. Max. memory is 11.5 GB. * Boogie Procedure Inliner took 24.51 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 16.08 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. * RCFGBuilder took 175.52 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: 21.9 MB). Peak memory consumption was 21.9 MB. Max. memory is 11.5 GB. * TraceAbstraction took 4863.35 ms. Allocated memory was 1.1 GB in the beginning and 1.2 GB in the end (delta: 37.7 MB). Free memory was 1.1 GB in the beginning and 831.6 MB in the end (delta: 243.4 MB). Peak memory consumption was 281.2 MB. Max. memory is 11.5 GB. * Witness Printer took 37.30 ms. Allocated memory is still 1.2 GB. Free memory was 831.6 MB in the beginning and 831.2 MB in the end (delta: 385.9 kB). Peak memory consumption was 385.9 kB. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 6]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L14] int MAX = __VERIFIER_nondet_uint(); [L16] char str1[MAX], str2[MAX]; [L17] int cont, i, j; [L18] cont = 0 [L20] i=0 [L20] COND TRUE i= 0 [L28] EXPR str1[0] [L28] str2[j] = str1[0] [L29] j++ [L27] i-- [L27] COND TRUE i >= 0 [L28] EXPR str1[0] [L28] str2[j] = str1[0] [L29] j++ [L27] i-- [L27] COND FALSE !(i >= 0) [L32] j = MAX-1 [L33] i=0 [L33] COND TRUE i