./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loops/string-2.i --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_688fdbf1-6e11-42e8-ab61-985eff1cfd8d/bin/uautomizer/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/run_dir_688fdbf1-6e11-42e8-ab61-985eff1cfd8d/bin/uautomizer/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_688fdbf1-6e11-42e8-ab61-985eff1cfd8d/bin/uautomizer/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_688fdbf1-6e11-42e8-ab61-985eff1cfd8d/bin/uautomizer/config/AutomizerReach.xml -i ../../sv-benchmarks/c/loops/string-2.i -s /tmp/vcloud-vcloud-master/worker/run_dir_688fdbf1-6e11-42e8-ab61-985eff1cfd8d/bin/uautomizer/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_688fdbf1-6e11-42e8-ab61-985eff1cfd8d/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 77cd31699320cd40da64f32a92959020d19291bd ..................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis Calling Ultimate with: /usr/lib/jvm/java-8-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_688fdbf1-6e11-42e8-ab61-985eff1cfd8d/bin/uautomizer/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/run_dir_688fdbf1-6e11-42e8-ab61-985eff1cfd8d/bin/uautomizer/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_688fdbf1-6e11-42e8-ab61-985eff1cfd8d/bin/uautomizer/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_688fdbf1-6e11-42e8-ab61-985eff1cfd8d/bin/uautomizer/config/AutomizerReach.xml -i ../../sv-benchmarks/c/loops/string-2.i -s /tmp/vcloud-vcloud-master/worker/run_dir_688fdbf1-6e11-42e8-ab61-985eff1cfd8d/bin/uautomizer/config/svcomp-Reach-32bit-Automizer_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_688fdbf1-6e11-42e8-ab61-985eff1cfd8d/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 77cd31699320cd40da64f32a92959020d19291bd .............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................. 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 17:40:01,925 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-12-07 17:40:01,926 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-12-07 17:40:01,934 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-12-07 17:40:01,934 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-12-07 17:40:01,935 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-12-07 17:40:01,936 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-12-07 17:40:01,937 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-12-07 17:40:01,938 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-12-07 17:40:01,939 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-12-07 17:40:01,940 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-12-07 17:40:01,940 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-12-07 17:40:01,941 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-12-07 17:40:01,941 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-12-07 17:40:01,942 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-12-07 17:40:01,943 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-12-07 17:40:01,944 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-12-07 17:40:01,944 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-12-07 17:40:01,945 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-12-07 17:40:01,947 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-12-07 17:40:01,948 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-12-07 17:40:01,949 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-12-07 17:40:01,949 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-12-07 17:40:01,950 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-12-07 17:40:01,951 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-12-07 17:40:01,952 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-12-07 17:40:01,952 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-12-07 17:40:01,952 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-12-07 17:40:01,952 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-12-07 17:40:01,953 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-12-07 17:40:01,953 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-12-07 17:40:01,954 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-12-07 17:40:01,954 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-12-07 17:40:01,954 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-12-07 17:40:01,955 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-12-07 17:40:01,955 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-12-07 17:40:01,955 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-12-07 17:40:01,956 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-12-07 17:40:01,956 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-12-07 17:40:01,956 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-12-07 17:40:01,957 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-12-07 17:40:01,957 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_688fdbf1-6e11-42e8-ab61-985eff1cfd8d/bin/uautomizer/config/svcomp-Reach-32bit-Automizer_Default.epf [2019-12-07 17:40:01,966 INFO L113 SettingsManager]: Loading preferences was successful [2019-12-07 17:40:01,966 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-12-07 17:40:01,967 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-12-07 17:40:01,967 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-12-07 17:40:01,967 INFO L138 SettingsManager]: * Use SBE=true [2019-12-07 17:40:01,967 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-12-07 17:40:01,967 INFO L138 SettingsManager]: * sizeof long=4 [2019-12-07 17:40:01,967 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-12-07 17:40:01,968 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-12-07 17:40:01,968 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-12-07 17:40:01,968 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-12-07 17:40:01,968 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-12-07 17:40:01,968 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-12-07 17:40:01,968 INFO L138 SettingsManager]: * sizeof long double=12 [2019-12-07 17:40:01,968 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-12-07 17:40:01,968 INFO L138 SettingsManager]: * Use constant arrays=true [2019-12-07 17:40:01,968 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-12-07 17:40:01,969 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-12-07 17:40:01,969 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-12-07 17:40:01,969 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-12-07 17:40:01,969 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-12-07 17:40:01,969 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-12-07 17:40:01,969 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-12-07 17:40:01,969 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-12-07 17:40:01,970 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-12-07 17:40:01,970 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-12-07 17:40:01,970 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-12-07 17:40:01,970 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-12-07 17:40:01,970 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2019-12-07 17:40:01,970 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_688fdbf1-6e11-42e8-ab61-985eff1cfd8d/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 -> 77cd31699320cd40da64f32a92959020d19291bd [2019-12-07 17:40:02,070 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-12-07 17:40:02,078 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-12-07 17:40:02,080 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-12-07 17:40:02,081 INFO L271 PluginConnector]: Initializing CDTParser... [2019-12-07 17:40:02,081 INFO L275 PluginConnector]: CDTParser initialized [2019-12-07 17:40:02,082 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_688fdbf1-6e11-42e8-ab61-985eff1cfd8d/bin/uautomizer/../../sv-benchmarks/c/loops/string-2.i [2019-12-07 17:40:02,120 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_688fdbf1-6e11-42e8-ab61-985eff1cfd8d/bin/uautomizer/data/a2084cce8/5841eb20dd634d5c9a5a4f21f6a325df/FLAG87fab055b [2019-12-07 17:40:02,517 INFO L306 CDTParser]: Found 1 translation units. [2019-12-07 17:40:02,517 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_688fdbf1-6e11-42e8-ab61-985eff1cfd8d/sv-benchmarks/c/loops/string-2.i [2019-12-07 17:40:02,521 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_688fdbf1-6e11-42e8-ab61-985eff1cfd8d/bin/uautomizer/data/a2084cce8/5841eb20dd634d5c9a5a4f21f6a325df/FLAG87fab055b [2019-12-07 17:40:02,530 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_688fdbf1-6e11-42e8-ab61-985eff1cfd8d/bin/uautomizer/data/a2084cce8/5841eb20dd634d5c9a5a4f21f6a325df [2019-12-07 17:40:02,532 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-12-07 17:40:02,533 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2019-12-07 17:40:02,534 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-12-07 17:40:02,534 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-12-07 17:40:02,537 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-12-07 17:40:02,537 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.12 05:40:02" (1/1) ... [2019-12-07 17:40:02,539 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3b0e63b3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 05:40:02, skipping insertion in model container [2019-12-07 17:40:02,539 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.12 05:40:02" (1/1) ... [2019-12-07 17:40:02,544 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2019-12-07 17:40:02,556 INFO L178 MainTranslator]: Built tables and reachable declarations [2019-12-07 17:40:02,695 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-12-07 17:40:02,698 INFO L203 MainTranslator]: Completed pre-run [2019-12-07 17:40:02,713 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-12-07 17:40:02,726 INFO L208 MainTranslator]: Completed translation [2019-12-07 17:40:02,726 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 05:40:02 WrapperNode [2019-12-07 17:40:02,726 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-12-07 17:40:02,726 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-12-07 17:40:02,727 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-12-07 17:40:02,727 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2019-12-07 17:40:02,732 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 05:40:02" (1/1) ... [2019-12-07 17:40:02,738 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 05:40:02" (1/1) ... [2019-12-07 17:40:02,752 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-12-07 17:40:02,753 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-12-07 17:40:02,753 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-12-07 17:40:02,753 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-12-07 17:40:02,759 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 05:40:02" (1/1) ... [2019-12-07 17:40:02,759 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 05:40:02" (1/1) ... [2019-12-07 17:40:02,760 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 05:40:02" (1/1) ... [2019-12-07 17:40:02,761 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 05:40:02" (1/1) ... [2019-12-07 17:40:02,765 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 05:40:02" (1/1) ... [2019-12-07 17:40:02,768 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 05:40:02" (1/1) ... [2019-12-07 17:40:02,769 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 05:40:02" (1/1) ... [2019-12-07 17:40:02,771 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-12-07 17:40:02,771 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-12-07 17:40:02,771 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-12-07 17:40:02,771 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-12-07 17:40:02,772 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 05:40:02" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_688fdbf1-6e11-42e8-ab61-985eff1cfd8d/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 17:40:02,811 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-12-07 17:40:02,811 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-12-07 17:40:02,811 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-12-07 17:40:02,811 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-12-07 17:40:02,811 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-12-07 17:40:02,811 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-12-07 17:40:02,967 INFO L282 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-12-07 17:40:02,967 INFO L287 CfgBuilder]: Removed 11 assume(true) statements. [2019-12-07 17:40:02,968 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.12 05:40:02 BoogieIcfgContainer [2019-12-07 17:40:02,968 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-12-07 17:40:02,968 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-12-07 17:40:02,968 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-12-07 17:40:02,970 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-12-07 17:40:02,970 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.12 05:40:02" (1/3) ... [2019-12-07 17:40:02,971 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2aeac877 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.12 05:40:02, skipping insertion in model container [2019-12-07 17:40:02,971 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 05:40:02" (2/3) ... [2019-12-07 17:40:02,971 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2aeac877 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.12 05:40:02, skipping insertion in model container [2019-12-07 17:40:02,971 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.12 05:40:02" (3/3) ... [2019-12-07 17:40:02,972 INFO L109 eAbstractionObserver]: Analyzing ICFG string-2.i [2019-12-07 17:40:02,978 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-12-07 17:40:02,982 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-12-07 17:40:02,989 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-12-07 17:40:03,003 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-12-07 17:40:03,003 INFO L374 AbstractCegarLoop]: Hoare is true [2019-12-07 17:40:03,004 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-12-07 17:40:03,004 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-12-07 17:40:03,004 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-12-07 17:40:03,004 INFO L378 AbstractCegarLoop]: Difference is false [2019-12-07 17:40:03,004 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-12-07 17:40:03,004 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-12-07 17:40:03,014 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states. [2019-12-07 17:40:03,018 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-12-07 17:40:03,018 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 17:40:03,020 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-12-07 17:40:03,020 INFO L410 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-07 17:40:03,024 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 17:40:03,024 INFO L82 PathProgramCache]: Analyzing trace with hash 374782792, now seen corresponding path program 1 times [2019-12-07 17:40:03,030 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-12-07 17:40:03,030 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1058522417] [2019-12-07 17:40:03,030 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 17:40:03,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 17:40:03,113 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 17:40:03,113 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1058522417] [2019-12-07 17:40:03,114 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-12-07 17:40:03,114 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-12-07 17:40:03,114 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1881515173] [2019-12-07 17:40:03,117 INFO L442 AbstractCegarLoop]: Interpolant automaton has 2 states [2019-12-07 17:40:03,117 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-12-07 17:40:03,126 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2019-12-07 17:40:03,126 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-12-07 17:40:03,127 INFO L87 Difference]: Start difference. First operand 26 states. Second operand 2 states. [2019-12-07 17:40:03,139 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 17:40:03,139 INFO L93 Difference]: Finished difference Result 48 states and 74 transitions. [2019-12-07 17:40:03,140 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2019-12-07 17:40:03,140 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 16 [2019-12-07 17:40:03,141 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 17:40:03,146 INFO L225 Difference]: With dead ends: 48 [2019-12-07 17:40:03,146 INFO L226 Difference]: Without dead ends: 22 [2019-12-07 17:40:03,148 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-12-07 17:40:03,160 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2019-12-07 17:40:03,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2019-12-07 17:40:03,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2019-12-07 17:40:03,171 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 27 transitions. [2019-12-07 17:40:03,172 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 27 transitions. Word has length 16 [2019-12-07 17:40:03,172 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 17:40:03,172 INFO L462 AbstractCegarLoop]: Abstraction has 22 states and 27 transitions. [2019-12-07 17:40:03,172 INFO L463 AbstractCegarLoop]: Interpolant automaton has 2 states. [2019-12-07 17:40:03,172 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 27 transitions. [2019-12-07 17:40:03,173 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2019-12-07 17:40:03,173 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 17:40:03,173 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-12-07 17:40:03,173 INFO L410 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-07 17:40:03,174 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 17:40:03,174 INFO L82 PathProgramCache]: Analyzing trace with hash 1602331574, now seen corresponding path program 1 times [2019-12-07 17:40:03,174 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-12-07 17:40:03,174 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1766989494] [2019-12-07 17:40:03,174 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 17:40:03,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 17:40:03,213 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 17:40:03,213 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1766989494] [2019-12-07 17:40:03,213 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-12-07 17:40:03,213 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-12-07 17:40:03,214 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1700727020] [2019-12-07 17:40:03,215 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-12-07 17:40:03,215 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-12-07 17:40:03,215 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-12-07 17:40:03,216 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-12-07 17:40:03,216 INFO L87 Difference]: Start difference. First operand 22 states and 27 transitions. Second operand 3 states. [2019-12-07 17:40:03,255 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 17:40:03,255 INFO L93 Difference]: Finished difference Result 50 states and 62 transitions. [2019-12-07 17:40:03,256 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-12-07 17:40:03,256 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 18 [2019-12-07 17:40:03,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 17:40:03,257 INFO L225 Difference]: With dead ends: 50 [2019-12-07 17:40:03,257 INFO L226 Difference]: Without dead ends: 32 [2019-12-07 17:40:03,258 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 17:40:03,258 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2019-12-07 17:40:03,261 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 24. [2019-12-07 17:40:03,262 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2019-12-07 17:40:03,262 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 29 transitions. [2019-12-07 17:40:03,262 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 29 transitions. Word has length 18 [2019-12-07 17:40:03,262 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 17:40:03,262 INFO L462 AbstractCegarLoop]: Abstraction has 24 states and 29 transitions. [2019-12-07 17:40:03,262 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-12-07 17:40:03,263 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 29 transitions. [2019-12-07 17:40:03,263 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2019-12-07 17:40:03,263 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 17:40:03,263 INFO L410 BasicCegarLoop]: trace histogram [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 17:40:03,263 INFO L410 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-07 17:40:03,263 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 17:40:03,264 INFO L82 PathProgramCache]: Analyzing trace with hash 177830358, now seen corresponding path program 1 times [2019-12-07 17:40:03,264 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-12-07 17:40:03,264 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [493979077] [2019-12-07 17:40:03,264 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 17:40:03,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 17:40:03,308 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-12-07 17:40:03,308 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [493979077] [2019-12-07 17:40:03,309 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1349181734] [2019-12-07 17:40:03,309 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_688fdbf1-6e11-42e8-ab61-985eff1cfd8d/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 17:40:03,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 17:40:03,353 INFO L264 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 3 conjunts are in the unsatisfiable core [2019-12-07 17:40:03,357 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 17:40:03,374 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-12-07 17:40:03,374 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-12-07 17:40:03,374 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2019-12-07 17:40:03,374 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1684053980] [2019-12-07 17:40:03,375 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-12-07 17:40:03,375 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-12-07 17:40:03,375 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-12-07 17:40:03,375 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2019-12-07 17:40:03,375 INFO L87 Difference]: Start difference. First operand 24 states and 29 transitions. Second operand 5 states. [2019-12-07 17:40:03,420 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 17:40:03,420 INFO L93 Difference]: Finished difference Result 61 states and 74 transitions. [2019-12-07 17:40:03,420 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-12-07 17:40:03,420 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 22 [2019-12-07 17:40:03,421 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 17:40:03,421 INFO L225 Difference]: With dead ends: 61 [2019-12-07 17:40:03,421 INFO L226 Difference]: Without dead ends: 42 [2019-12-07 17:40:03,422 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2019-12-07 17:40:03,422 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2019-12-07 17:40:03,425 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 28. [2019-12-07 17:40:03,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2019-12-07 17:40:03,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 33 transitions. [2019-12-07 17:40:03,426 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 33 transitions. Word has length 22 [2019-12-07 17:40:03,426 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 17:40:03,427 INFO L462 AbstractCegarLoop]: Abstraction has 28 states and 33 transitions. [2019-12-07 17:40:03,427 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-12-07 17:40:03,427 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 33 transitions. [2019-12-07 17:40:03,428 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2019-12-07 17:40:03,428 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 17:40:03,428 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-12-07 17:40:03,629 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 17:40:03,629 INFO L410 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-07 17:40:03,630 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 17:40:03,631 INFO L82 PathProgramCache]: Analyzing trace with hash 1590720246, now seen corresponding path program 2 times [2019-12-07 17:40:03,631 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-12-07 17:40:03,631 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1075782447] [2019-12-07 17:40:03,632 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 17:40:03,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 17:40:03,781 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-12-07 17:40:03,782 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1075782447] [2019-12-07 17:40:03,783 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [623834818] [2019-12-07 17:40:03,783 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_688fdbf1-6e11-42e8-ab61-985eff1cfd8d/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 17:40:03,867 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-12-07 17:40:03,867 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-12-07 17:40:03,867 INFO L264 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 4 conjunts are in the unsatisfiable core [2019-12-07 17:40:03,869 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 17:40:03,877 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-12-07 17:40:03,877 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-12-07 17:40:03,877 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2019-12-07 17:40:03,878 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1294929628] [2019-12-07 17:40:03,878 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-12-07 17:40:03,878 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-12-07 17:40:03,878 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-12-07 17:40:03,879 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2019-12-07 17:40:03,879 INFO L87 Difference]: Start difference. First operand 28 states and 33 transitions. Second operand 6 states. [2019-12-07 17:40:03,925 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 17:40:03,925 INFO L93 Difference]: Finished difference Result 73 states and 87 transitions. [2019-12-07 17:40:03,925 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-12-07 17:40:03,925 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 26 [2019-12-07 17:40:03,925 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 17:40:03,926 INFO L225 Difference]: With dead ends: 73 [2019-12-07 17:40:03,926 INFO L226 Difference]: Without dead ends: 52 [2019-12-07 17:40:03,926 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2019-12-07 17:40:03,927 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2019-12-07 17:40:03,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 32. [2019-12-07 17:40:03,929 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2019-12-07 17:40:03,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 37 transitions. [2019-12-07 17:40:03,930 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 37 transitions. Word has length 26 [2019-12-07 17:40:03,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 17:40:03,930 INFO L462 AbstractCegarLoop]: Abstraction has 32 states and 37 transitions. [2019-12-07 17:40:03,930 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-12-07 17:40:03,930 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 37 transitions. [2019-12-07 17:40:03,931 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2019-12-07 17:40:03,931 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 17:40:03,931 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-12-07 17:40:04,132 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 17:40:04,132 INFO L410 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-07 17:40:04,133 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 17:40:04,133 INFO L82 PathProgramCache]: Analyzing trace with hash -381068522, now seen corresponding path program 3 times [2019-12-07 17:40:04,133 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-12-07 17:40:04,134 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [980399888] [2019-12-07 17:40:04,134 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 17:40:04,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 17:40:04,269 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-12-07 17:40:04,270 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [980399888] [2019-12-07 17:40:04,270 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1951410464] [2019-12-07 17:40:04,271 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_688fdbf1-6e11-42e8-ab61-985eff1cfd8d/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 17:40:04,342 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2019-12-07 17:40:04,343 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-12-07 17:40:04,344 INFO L264 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 5 conjunts are in the unsatisfiable core [2019-12-07 17:40:04,346 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 17:40:04,356 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-12-07 17:40:04,356 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-12-07 17:40:04,357 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2019-12-07 17:40:04,357 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [161779489] [2019-12-07 17:40:04,357 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-12-07 17:40:04,358 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-12-07 17:40:04,358 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-12-07 17:40:04,358 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2019-12-07 17:40:04,358 INFO L87 Difference]: Start difference. First operand 32 states and 37 transitions. Second operand 7 states. [2019-12-07 17:40:04,417 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 17:40:04,417 INFO L93 Difference]: Finished difference Result 85 states and 100 transitions. [2019-12-07 17:40:04,418 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-12-07 17:40:04,418 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 30 [2019-12-07 17:40:04,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 17:40:04,419 INFO L225 Difference]: With dead ends: 85 [2019-12-07 17:40:04,419 INFO L226 Difference]: Without dead ends: 62 [2019-12-07 17:40:04,420 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2019-12-07 17:40:04,420 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2019-12-07 17:40:04,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 36. [2019-12-07 17:40:04,424 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2019-12-07 17:40:04,424 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 41 transitions. [2019-12-07 17:40:04,425 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 41 transitions. Word has length 30 [2019-12-07 17:40:04,425 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 17:40:04,425 INFO L462 AbstractCegarLoop]: Abstraction has 36 states and 41 transitions. [2019-12-07 17:40:04,425 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-12-07 17:40:04,425 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 41 transitions. [2019-12-07 17:40:04,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2019-12-07 17:40:04,426 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 17:40:04,426 INFO L410 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-12-07 17:40:04,627 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 17:40:04,627 INFO L410 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-07 17:40:04,627 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 17:40:04,627 INFO L82 PathProgramCache]: Analyzing trace with hash -583604682, now seen corresponding path program 4 times [2019-12-07 17:40:04,627 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-12-07 17:40:04,628 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1001684704] [2019-12-07 17:40:04,628 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 17:40:04,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 17:40:04,682 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-12-07 17:40:04,682 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1001684704] [2019-12-07 17:40:04,682 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2091195535] [2019-12-07 17:40:04,682 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_688fdbf1-6e11-42e8-ab61-985eff1cfd8d/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 17:40:04,711 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-12-07 17:40:04,711 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-12-07 17:40:04,712 INFO L264 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 6 conjunts are in the unsatisfiable core [2019-12-07 17:40:04,713 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 17:40:04,721 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-12-07 17:40:04,721 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-12-07 17:40:04,722 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2019-12-07 17:40:04,722 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [335698591] [2019-12-07 17:40:04,722 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-12-07 17:40:04,722 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-12-07 17:40:04,723 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-12-07 17:40:04,723 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2019-12-07 17:40:04,723 INFO L87 Difference]: Start difference. First operand 36 states and 41 transitions. Second operand 8 states. [2019-12-07 17:40:04,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 17:40:04,787 INFO L93 Difference]: Finished difference Result 95 states and 111 transitions. [2019-12-07 17:40:04,787 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-12-07 17:40:04,787 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 34 [2019-12-07 17:40:04,787 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 17:40:04,788 INFO L225 Difference]: With dead ends: 95 [2019-12-07 17:40:04,788 INFO L226 Difference]: Without dead ends: 70 [2019-12-07 17:40:04,789 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2019-12-07 17:40:04,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2019-12-07 17:40:04,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 40. [2019-12-07 17:40:04,792 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2019-12-07 17:40:04,792 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 45 transitions. [2019-12-07 17:40:04,793 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 45 transitions. Word has length 34 [2019-12-07 17:40:04,793 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 17:40:04,793 INFO L462 AbstractCegarLoop]: Abstraction has 40 states and 45 transitions. [2019-12-07 17:40:04,793 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-12-07 17:40:04,793 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 45 transitions. [2019-12-07 17:40:04,794 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2019-12-07 17:40:04,794 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 17:40:04,794 INFO L410 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-12-07 17:40:04,994 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 17:40:04,995 INFO L410 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-07 17:40:04,995 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 17:40:04,995 INFO L82 PathProgramCache]: Analyzing trace with hash -270804906, now seen corresponding path program 5 times [2019-12-07 17:40:04,995 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-12-07 17:40:04,995 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1931476093] [2019-12-07 17:40:04,996 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 17:40:05,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-12-07 17:40:05,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-12-07 17:40:05,055 INFO L174 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2019-12-07 17:40:05,055 INFO L475 BasicCegarLoop]: Counterexample might be feasible [2019-12-07 17:40:05,081 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 07.12 05:40:05 BoogieIcfgContainer [2019-12-07 17:40:05,081 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2019-12-07 17:40:05,081 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2019-12-07 17:40:05,082 INFO L271 PluginConnector]: Initializing Witness Printer... [2019-12-07 17:40:05,082 INFO L275 PluginConnector]: Witness Printer initialized [2019-12-07 17:40:05,082 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.12 05:40:02" (3/4) ... [2019-12-07 17:40:05,084 INFO L140 WitnessPrinter]: No result that supports witness generation found [2019-12-07 17:40:05,085 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2019-12-07 17:40:05,086 INFO L168 Benchmark]: Toolchain (without parser) took 2552.66 ms. Allocated memory was 1.0 GB in the beginning and 1.1 GB in the end (delta: 99.6 MB). Free memory was 939.4 MB in the beginning and 900.4 MB in the end (delta: 39.0 MB). Peak memory consumption was 138.6 MB. Max. memory is 11.5 GB. [2019-12-07 17:40:05,086 INFO L168 Benchmark]: CDTParser took 0.14 ms. Allocated memory is still 1.0 GB. Free memory is still 955.5 MB. There was no memory consumed. Max. memory is 11.5 GB. [2019-12-07 17:40:05,087 INFO L168 Benchmark]: CACSL2BoogieTranslator took 192.34 ms. Allocated memory was 1.0 GB in the beginning and 1.1 GB in the end (delta: 99.6 MB). Free memory was 939.4 MB in the beginning and 1.1 GB in the end (delta: -155.1 MB). Peak memory consumption was 24.4 MB. Max. memory is 11.5 GB. [2019-12-07 17:40:05,087 INFO L168 Benchmark]: Boogie Procedure Inliner took 26.13 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 17:40:05,088 INFO L168 Benchmark]: Boogie Preprocessor took 18.27 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: 5.4 MB). Peak memory consumption was 5.4 MB. Max. memory is 11.5 GB. [2019-12-07 17:40:05,088 INFO L168 Benchmark]: RCFGBuilder took 196.67 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 17:40:05,089 INFO L168 Benchmark]: TraceAbstraction took 2112.90 ms. Allocated memory is still 1.1 GB. Free memory was 1.1 GB in the beginning and 900.4 MB in the end (delta: 166.9 MB). Peak memory consumption was 166.9 MB. Max. memory is 11.5 GB. [2019-12-07 17:40:05,089 INFO L168 Benchmark]: Witness Printer took 3.13 ms. Allocated memory is still 1.1 GB. Free memory is still 900.4 MB. There was no memory consumed. Max. memory is 11.5 GB. [2019-12-07 17:40:05,091 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.14 ms. Allocated memory is still 1.0 GB. Free memory is still 955.5 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 192.34 ms. Allocated memory was 1.0 GB in the beginning and 1.1 GB in the end (delta: 99.6 MB). Free memory was 939.4 MB in the beginning and 1.1 GB in the end (delta: -155.1 MB). Peak memory consumption was 24.4 MB. Max. memory is 11.5 GB. * Boogie Procedure Inliner took 26.13 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 18.27 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: 5.4 MB). Peak memory consumption was 5.4 MB. Max. memory is 11.5 GB. * RCFGBuilder took 196.67 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 2112.90 ms. Allocated memory is still 1.1 GB. Free memory was 1.1 GB in the beginning and 900.4 MB in the end (delta: 166.9 MB). Peak memory consumption was 166.9 MB. Max. memory is 11.5 GB. * Witness Printer took 3.13 ms. Allocated memory is still 1.1 GB. Free memory is still 900.4 MB. There was no memory consumed. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - UnprovableResult [Line: 6]: Unable to prove that call of __VERIFIER_error() unreachable Unable to prove that call of __VERIFIER_error() unreachable Reason: overapproximation of shiftLeft at line 55. Possible FailurePath: [L17] char string_A[5], string_B[5]; [L18] int i, j, nc_A, nc_B, found=0; [L21] i=0 [L21] COND TRUE i<5 [L22] string_A[i]=__VERIFIER_nondet_char() [L21] i++ [L21] COND TRUE i<5 [L22] string_A[i]=__VERIFIER_nondet_char() [L21] i++ [L21] COND TRUE i<5 [L22] string_A[i]=__VERIFIER_nondet_char() [L21] i++ [L21] COND TRUE i<5 [L22] string_A[i]=__VERIFIER_nondet_char() [L21] i++ [L21] COND TRUE i<5 [L22] string_A[i]=__VERIFIER_nondet_char() [L21] i++ [L21] COND FALSE !(i<5) [L23] EXPR string_A[5 -1] [L23] COND FALSE !(!(string_A[5 -1]=='\0')) [L25] i=0 [L25] COND TRUE i<5 [L26] string_B[i]=__VERIFIER_nondet_char() [L25] i++ [L25] COND TRUE i<5 [L26] string_B[i]=__VERIFIER_nondet_char() [L25] i++ [L25] COND TRUE i<5 [L26] string_B[i]=__VERIFIER_nondet_char() [L25] i++ [L25] COND TRUE i<5 [L26] string_B[i]=__VERIFIER_nondet_char() [L25] i++ [L25] COND TRUE i<5 [L26] string_B[i]=__VERIFIER_nondet_char() [L25] i++ [L25] COND FALSE !(i<5) [L27] EXPR string_B[5 -1] [L27] COND FALSE !(!(string_B[5 -1]=='\0')) [L29] nc_A = 0 [L30] EXPR string_A[nc_A] [L30] COND FALSE !(string_A[nc_A]!='\0') [L33] nc_B = 0 [L34] EXPR string_B[nc_B] [L34] COND FALSE !(string_B[nc_B]!='\0') [L37] COND FALSE !(!(nc_B >= nc_A)) [L40] EXPR j=0 [L40] i=j=0 [L41] COND FALSE !((inc_B-1)< main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_688fdbf1-6e11-42e8-ab61-985eff1cfd8d/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 -> 77cd31699320cd40da64f32a92959020d19291bd [2019-12-07 17:40:06,683 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-12-07 17:40:06,692 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-12-07 17:40:06,694 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-12-07 17:40:06,695 INFO L271 PluginConnector]: Initializing CDTParser... [2019-12-07 17:40:06,696 INFO L275 PluginConnector]: CDTParser initialized [2019-12-07 17:40:06,696 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_688fdbf1-6e11-42e8-ab61-985eff1cfd8d/bin/uautomizer/../../sv-benchmarks/c/loops/string-2.i [2019-12-07 17:40:06,736 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_688fdbf1-6e11-42e8-ab61-985eff1cfd8d/bin/uautomizer/data/8c8e81cdf/f48d7c0c09564b1c9aff93c4a8c3f193/FLAG79fb72b55 [2019-12-07 17:40:07,142 INFO L306 CDTParser]: Found 1 translation units. [2019-12-07 17:40:07,143 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_688fdbf1-6e11-42e8-ab61-985eff1cfd8d/sv-benchmarks/c/loops/string-2.i [2019-12-07 17:40:07,147 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_688fdbf1-6e11-42e8-ab61-985eff1cfd8d/bin/uautomizer/data/8c8e81cdf/f48d7c0c09564b1c9aff93c4a8c3f193/FLAG79fb72b55 [2019-12-07 17:40:07,513 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_688fdbf1-6e11-42e8-ab61-985eff1cfd8d/bin/uautomizer/data/8c8e81cdf/f48d7c0c09564b1c9aff93c4a8c3f193 [2019-12-07 17:40:07,516 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-12-07 17:40:07,518 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2019-12-07 17:40:07,518 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-12-07 17:40:07,519 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-12-07 17:40:07,522 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-12-07 17:40:07,523 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.12 05:40:07" (1/1) ... [2019-12-07 17:40:07,525 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4a0f9973 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 05:40:07, skipping insertion in model container [2019-12-07 17:40:07,526 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.12 05:40:07" (1/1) ... [2019-12-07 17:40:07,533 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2019-12-07 17:40:07,547 INFO L178 MainTranslator]: Built tables and reachable declarations [2019-12-07 17:40:07,653 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-12-07 17:40:07,656 INFO L203 MainTranslator]: Completed pre-run [2019-12-07 17:40:07,673 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-12-07 17:40:07,686 INFO L208 MainTranslator]: Completed translation [2019-12-07 17:40:07,687 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 05:40:07 WrapperNode [2019-12-07 17:40:07,687 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-12-07 17:40:07,687 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-12-07 17:40:07,687 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-12-07 17:40:07,687 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2019-12-07 17:40:07,692 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 05:40:07" (1/1) ... [2019-12-07 17:40:07,699 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 05:40:07" (1/1) ... [2019-12-07 17:40:07,743 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-12-07 17:40:07,743 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-12-07 17:40:07,743 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-12-07 17:40:07,743 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-12-07 17:40:07,749 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 05:40:07" (1/1) ... [2019-12-07 17:40:07,750 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 05:40:07" (1/1) ... [2019-12-07 17:40:07,752 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 05:40:07" (1/1) ... [2019-12-07 17:40:07,752 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 05:40:07" (1/1) ... [2019-12-07 17:40:07,757 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 05:40:07" (1/1) ... [2019-12-07 17:40:07,761 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 05:40:07" (1/1) ... [2019-12-07 17:40:07,762 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 05:40:07" (1/1) ... [2019-12-07 17:40:07,764 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-12-07 17:40:07,765 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-12-07 17:40:07,765 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-12-07 17:40:07,765 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-12-07 17:40:07,765 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 05:40:07" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_688fdbf1-6e11-42e8-ab61-985eff1cfd8d/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 17:40:07,805 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE1 [2019-12-07 17:40:07,805 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-12-07 17:40:07,805 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-12-07 17:40:07,805 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE1 [2019-12-07 17:40:07,805 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-12-07 17:40:07,805 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-12-07 17:40:08,009 INFO L282 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-12-07 17:40:08,010 INFO L287 CfgBuilder]: Removed 11 assume(true) statements. [2019-12-07 17:40:08,010 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.12 05:40:08 BoogieIcfgContainer [2019-12-07 17:40:08,010 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-12-07 17:40:08,011 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-12-07 17:40:08,011 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-12-07 17:40:08,013 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-12-07 17:40:08,013 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.12 05:40:07" (1/3) ... [2019-12-07 17:40:08,014 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@381df8a8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.12 05:40:08, skipping insertion in model container [2019-12-07 17:40:08,014 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 05:40:07" (2/3) ... [2019-12-07 17:40:08,014 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@381df8a8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.12 05:40:08, skipping insertion in model container [2019-12-07 17:40:08,014 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.12 05:40:08" (3/3) ... [2019-12-07 17:40:08,015 INFO L109 eAbstractionObserver]: Analyzing ICFG string-2.i [2019-12-07 17:40:08,022 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-12-07 17:40:08,026 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-12-07 17:40:08,033 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-12-07 17:40:08,048 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-12-07 17:40:08,048 INFO L374 AbstractCegarLoop]: Hoare is true [2019-12-07 17:40:08,048 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-12-07 17:40:08,048 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-12-07 17:40:08,048 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-12-07 17:40:08,048 INFO L378 AbstractCegarLoop]: Difference is false [2019-12-07 17:40:08,048 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-12-07 17:40:08,049 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-12-07 17:40:08,059 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states. [2019-12-07 17:40:08,063 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-12-07 17:40:08,063 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 17:40:08,064 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-12-07 17:40:08,064 INFO L410 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-07 17:40:08,067 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 17:40:08,068 INFO L82 PathProgramCache]: Analyzing trace with hash 374782792, now seen corresponding path program 1 times [2019-12-07 17:40:08,075 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-12-07 17:40:08,075 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1307735740] [2019-12-07 17:40:08,075 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_688fdbf1-6e11-42e8-ab61-985eff1cfd8d/bin/uautomizer/mathsat Starting monitored process 2 with mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with mathsat -unsat_core_generation=3 [2019-12-07 17:40:08,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 17:40:08,121 INFO L264 TraceCheckSpWp]: Trace formula consists of 38 conjuncts, 1 conjunts are in the unsatisfiable core [2019-12-07 17:40:08,125 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 17:40:08,138 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 17:40:08,138 INFO L329 TraceCheckSpWp]: Computing backward predicates... [2019-12-07 17:40:08,141 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 17:40:08,142 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1307735740] [2019-12-07 17:40:08,142 INFO L220 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-12-07 17:40:08,143 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 2 [2019-12-07 17:40:08,143 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [794254972] [2019-12-07 17:40:08,146 INFO L442 AbstractCegarLoop]: Interpolant automaton has 2 states [2019-12-07 17:40:08,146 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-12-07 17:40:08,154 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2019-12-07 17:40:08,155 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-12-07 17:40:08,156 INFO L87 Difference]: Start difference. First operand 26 states. Second operand 2 states. [2019-12-07 17:40:08,172 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 17:40:08,172 INFO L93 Difference]: Finished difference Result 48 states and 74 transitions. [2019-12-07 17:40:08,172 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2019-12-07 17:40:08,173 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 16 [2019-12-07 17:40:08,174 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 17:40:08,181 INFO L225 Difference]: With dead ends: 48 [2019-12-07 17:40:08,181 INFO L226 Difference]: Without dead ends: 22 [2019-12-07 17:40:08,184 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-12-07 17:40:08,194 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2019-12-07 17:40:08,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2019-12-07 17:40:08,204 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2019-12-07 17:40:08,204 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 27 transitions. [2019-12-07 17:40:08,205 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 27 transitions. Word has length 16 [2019-12-07 17:40:08,205 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 17:40:08,205 INFO L462 AbstractCegarLoop]: Abstraction has 22 states and 27 transitions. [2019-12-07 17:40:08,205 INFO L463 AbstractCegarLoop]: Interpolant automaton has 2 states. [2019-12-07 17:40:08,206 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 27 transitions. [2019-12-07 17:40:08,206 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2019-12-07 17:40:08,206 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 17:40:08,206 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-12-07 17:40:08,407 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 mathsat -unsat_core_generation=3 [2019-12-07 17:40:08,408 INFO L410 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-07 17:40:08,408 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 17:40:08,408 INFO L82 PathProgramCache]: Analyzing trace with hash 1602331574, now seen corresponding path program 1 times [2019-12-07 17:40:08,410 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-12-07 17:40:08,411 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2004871952] [2019-12-07 17:40:08,411 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_688fdbf1-6e11-42e8-ab61-985eff1cfd8d/bin/uautomizer/mathsat Starting monitored process 3 with mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with mathsat -unsat_core_generation=3 [2019-12-07 17:40:08,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 17:40:08,493 INFO L264 TraceCheckSpWp]: Trace formula consists of 40 conjuncts, 2 conjunts are in the unsatisfiable core [2019-12-07 17:40:08,495 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 17:40:08,508 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 17:40:08,508 INFO L329 TraceCheckSpWp]: Computing backward predicates... [2019-12-07 17:40:08,517 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 17:40:08,517 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2004871952] [2019-12-07 17:40:08,518 INFO L220 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-12-07 17:40:08,518 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2019-12-07 17:40:08,518 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2116779455] [2019-12-07 17:40:08,519 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-12-07 17:40:08,519 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-12-07 17:40:08,519 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-12-07 17:40:08,520 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-12-07 17:40:08,520 INFO L87 Difference]: Start difference. First operand 22 states and 27 transitions. Second operand 4 states. [2019-12-07 17:40:08,602 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 17:40:08,602 INFO L93 Difference]: Finished difference Result 58 states and 73 transitions. [2019-12-07 17:40:08,603 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-12-07 17:40:08,603 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 18 [2019-12-07 17:40:08,603 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 17:40:08,605 INFO L225 Difference]: With dead ends: 58 [2019-12-07 17:40:08,605 INFO L226 Difference]: Without dead ends: 40 [2019-12-07 17:40:08,606 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-12-07 17:40:08,606 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2019-12-07 17:40:08,611 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 28. [2019-12-07 17:40:08,611 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2019-12-07 17:40:08,612 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 33 transitions. [2019-12-07 17:40:08,612 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 33 transitions. Word has length 18 [2019-12-07 17:40:08,612 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 17:40:08,612 INFO L462 AbstractCegarLoop]: Abstraction has 28 states and 33 transitions. [2019-12-07 17:40:08,612 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-12-07 17:40:08,612 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 33 transitions. [2019-12-07 17:40:08,613 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2019-12-07 17:40:08,613 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 17:40:08,613 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-12-07 17:40:08,814 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 mathsat -unsat_core_generation=3 [2019-12-07 17:40:08,815 INFO L410 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-07 17:40:08,816 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 17:40:08,816 INFO L82 PathProgramCache]: Analyzing trace with hash 1590720246, now seen corresponding path program 1 times [2019-12-07 17:40:08,818 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-12-07 17:40:08,819 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1316712085] [2019-12-07 17:40:08,820 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_688fdbf1-6e11-42e8-ab61-985eff1cfd8d/bin/uautomizer/mathsat Starting monitored process 4 with mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with mathsat -unsat_core_generation=3 [2019-12-07 17:40:08,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 17:40:08,908 INFO L264 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 4 conjunts are in the unsatisfiable core [2019-12-07 17:40:08,910 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 17:40:08,927 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-12-07 17:40:08,927 INFO L329 TraceCheckSpWp]: Computing backward predicates... [2019-12-07 17:40:08,970 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-12-07 17:40:08,971 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1316712085] [2019-12-07 17:40:08,971 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-12-07 17:40:08,971 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2019-12-07 17:40:08,971 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2104357282] [2019-12-07 17:40:08,972 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-12-07 17:40:08,972 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-12-07 17:40:08,972 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-12-07 17:40:08,972 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2019-12-07 17:40:08,972 INFO L87 Difference]: Start difference. First operand 28 states and 33 transitions. Second operand 8 states. [2019-12-07 17:40:09,237 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 17:40:09,238 INFO L93 Difference]: Finished difference Result 91 states and 111 transitions. [2019-12-07 17:40:09,239 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-12-07 17:40:09,239 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 26 [2019-12-07 17:40:09,239 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 17:40:09,240 INFO L225 Difference]: With dead ends: 91 [2019-12-07 17:40:09,240 INFO L226 Difference]: Without dead ends: 70 [2019-12-07 17:40:09,240 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=29, Invalid=43, Unknown=0, NotChecked=0, Total=72 [2019-12-07 17:40:09,241 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2019-12-07 17:40:09,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 40. [2019-12-07 17:40:09,245 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2019-12-07 17:40:09,246 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 45 transitions. [2019-12-07 17:40:09,246 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 45 transitions. Word has length 26 [2019-12-07 17:40:09,246 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 17:40:09,246 INFO L462 AbstractCegarLoop]: Abstraction has 40 states and 45 transitions. [2019-12-07 17:40:09,246 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-12-07 17:40:09,246 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 45 transitions. [2019-12-07 17:40:09,247 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2019-12-07 17:40:09,247 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 17:40:09,247 INFO L410 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-12-07 17:40:09,448 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 mathsat -unsat_core_generation=3 [2019-12-07 17:40:09,448 INFO L410 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-07 17:40:09,448 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 17:40:09,448 INFO L82 PathProgramCache]: Analyzing trace with hash -270804906, now seen corresponding path program 2 times [2019-12-07 17:40:09,449 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-12-07 17:40:09,449 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [298217912] [2019-12-07 17:40:09,449 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_688fdbf1-6e11-42e8-ab61-985eff1cfd8d/bin/uautomizer/mathsat Starting monitored process 5 with mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with mathsat -unsat_core_generation=3 [2019-12-07 17:40:09,491 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2019-12-07 17:40:09,492 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-12-07 17:40:09,494 INFO L264 TraceCheckSpWp]: Trace formula consists of 40 conjuncts, 6 conjunts are in the unsatisfiable core [2019-12-07 17:40:09,497 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 17:40:09,535 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2019-12-07 17:40:09,535 INFO L329 TraceCheckSpWp]: Computing backward predicates... [2019-12-07 17:40:09,547 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-12-07 17:40:09,615 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2019-12-07 17:40:09,615 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [298217912] [2019-12-07 17:40:09,615 INFO L220 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-12-07 17:40:09,615 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2019-12-07 17:40:09,616 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1457772612] [2019-12-07 17:40:09,616 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-12-07 17:40:09,616 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-12-07 17:40:09,616 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-12-07 17:40:09,616 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2019-12-07 17:40:09,617 INFO L87 Difference]: Start difference. First operand 40 states and 45 transitions. Second operand 6 states. [2019-12-07 17:40:09,733 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 17:40:09,733 INFO L93 Difference]: Finished difference Result 46 states and 52 transitions. [2019-12-07 17:40:09,734 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-12-07 17:40:09,734 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 38 [2019-12-07 17:40:09,734 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 17:40:09,735 INFO L225 Difference]: With dead ends: 46 [2019-12-07 17:40:09,735 INFO L226 Difference]: Without dead ends: 42 [2019-12-07 17:40:09,735 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 70 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-12-07 17:40:09,736 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2019-12-07 17:40:09,740 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2019-12-07 17:40:09,740 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2019-12-07 17:40:09,741 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 46 transitions. [2019-12-07 17:40:09,741 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 46 transitions. Word has length 38 [2019-12-07 17:40:09,742 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 17:40:09,742 INFO L462 AbstractCegarLoop]: Abstraction has 41 states and 46 transitions. [2019-12-07 17:40:09,742 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-12-07 17:40:09,742 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 46 transitions. [2019-12-07 17:40:09,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2019-12-07 17:40:09,743 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 17:40:09,743 INFO L410 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-12-07 17:40:09,944 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 mathsat -unsat_core_generation=3 [2019-12-07 17:40:09,945 INFO L410 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-07 17:40:09,945 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 17:40:09,946 INFO L82 PathProgramCache]: Analyzing trace with hash 1799835385, now seen corresponding path program 1 times [2019-12-07 17:40:09,947 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-12-07 17:40:09,947 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [458705558] [2019-12-07 17:40:09,948 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_688fdbf1-6e11-42e8-ab61-985eff1cfd8d/bin/uautomizer/mathsat Starting monitored process 6 with mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with mathsat -unsat_core_generation=3 [2019-12-07 17:40:10,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 17:40:10,067 INFO L264 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 4 conjunts are in the unsatisfiable core [2019-12-07 17:40:10,068 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 17:40:10,082 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2019-12-07 17:40:10,082 INFO L329 TraceCheckSpWp]: Computing backward predicates... [2019-12-07 17:40:10,098 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2019-12-07 17:40:10,098 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [458705558] [2019-12-07 17:40:10,098 INFO L220 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-12-07 17:40:10,098 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2019-12-07 17:40:10,099 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1059061400] [2019-12-07 17:40:10,099 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-12-07 17:40:10,099 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-12-07 17:40:10,099 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-12-07 17:40:10,099 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2019-12-07 17:40:10,100 INFO L87 Difference]: Start difference. First operand 41 states and 46 transitions. Second operand 6 states. [2019-12-07 17:40:10,150 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 17:40:10,150 INFO L93 Difference]: Finished difference Result 54 states and 62 transitions. [2019-12-07 17:40:10,150 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-12-07 17:40:10,150 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 40 [2019-12-07 17:40:10,151 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 17:40:10,151 INFO L225 Difference]: With dead ends: 54 [2019-12-07 17:40:10,151 INFO L226 Difference]: Without dead ends: 43 [2019-12-07 17:40:10,152 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 74 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2019-12-07 17:40:10,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2019-12-07 17:40:10,155 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2019-12-07 17:40:10,155 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2019-12-07 17:40:10,156 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 48 transitions. [2019-12-07 17:40:10,156 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 48 transitions. Word has length 40 [2019-12-07 17:40:10,156 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 17:40:10,156 INFO L462 AbstractCegarLoop]: Abstraction has 43 states and 48 transitions. [2019-12-07 17:40:10,156 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-12-07 17:40:10,156 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 48 transitions. [2019-12-07 17:40:10,157 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2019-12-07 17:40:10,157 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 17:40:10,157 INFO L410 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-12-07 17:40:10,358 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 mathsat -unsat_core_generation=3 [2019-12-07 17:40:10,359 INFO L410 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-07 17:40:10,359 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 17:40:10,360 INFO L82 PathProgramCache]: Analyzing trace with hash -1856180322, now seen corresponding path program 1 times [2019-12-07 17:40:10,361 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-12-07 17:40:10,362 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [3453752] [2019-12-07 17:40:10,362 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_688fdbf1-6e11-42e8-ab61-985eff1cfd8d/bin/uautomizer/mathsat Starting monitored process 7 with mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with mathsat -unsat_core_generation=3 [2019-12-07 17:40:10,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 17:40:10,453 INFO L264 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 4 conjunts are in the unsatisfiable core [2019-12-07 17:40:10,454 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 17:40:10,487 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2019-12-07 17:40:10,487 INFO L329 TraceCheckSpWp]: Computing backward predicates... [2019-12-07 17:40:10,518 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2019-12-07 17:40:10,518 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [3453752] [2019-12-07 17:40:10,519 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-12-07 17:40:10,519 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2019-12-07 17:40:10,519 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [690357451] [2019-12-07 17:40:10,519 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-12-07 17:40:10,519 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-12-07 17:40:10,520 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-12-07 17:40:10,520 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2019-12-07 17:40:10,520 INFO L87 Difference]: Start difference. First operand 43 states and 48 transitions. Second operand 8 states. [2019-12-07 17:40:10,651 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 17:40:10,651 INFO L93 Difference]: Finished difference Result 98 states and 116 transitions. [2019-12-07 17:40:10,651 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-12-07 17:40:10,652 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 42 [2019-12-07 17:40:10,652 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 17:40:10,653 INFO L225 Difference]: With dead ends: 98 [2019-12-07 17:40:10,653 INFO L226 Difference]: Without dead ends: 88 [2019-12-07 17:40:10,654 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 76 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=39, Invalid=71, Unknown=0, NotChecked=0, Total=110 [2019-12-07 17:40:10,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2019-12-07 17:40:10,659 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 52. [2019-12-07 17:40:10,659 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2019-12-07 17:40:10,660 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 60 transitions. [2019-12-07 17:40:10,660 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 60 transitions. Word has length 42 [2019-12-07 17:40:10,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 17:40:10,660 INFO L462 AbstractCegarLoop]: Abstraction has 52 states and 60 transitions. [2019-12-07 17:40:10,660 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-12-07 17:40:10,660 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 60 transitions. [2019-12-07 17:40:10,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2019-12-07 17:40:10,661 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 17:40:10,661 INFO L410 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-12-07 17:40:10,862 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 mathsat -unsat_core_generation=3 [2019-12-07 17:40:10,863 INFO L410 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-07 17:40:10,863 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 17:40:10,864 INFO L82 PathProgramCache]: Analyzing trace with hash -512239655, now seen corresponding path program 1 times [2019-12-07 17:40:10,865 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-12-07 17:40:10,865 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1972499906] [2019-12-07 17:40:10,866 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_688fdbf1-6e11-42e8-ab61-985eff1cfd8d/bin/uautomizer/mathsat Starting monitored process 8 with mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with mathsat -unsat_core_generation=3 [2019-12-07 17:40:11,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-12-07 17:40:11,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-12-07 17:40:11,133 INFO L174 FreeRefinementEngine]: Strategy WOLF found a feasible trace [2019-12-07 17:40:11,133 INFO L475 BasicCegarLoop]: Counterexample might be feasible [2019-12-07 17:40:11,333 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 mathsat -unsat_core_generation=3 [2019-12-07 17:40:11,365 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 07.12 05:40:11 BoogieIcfgContainer [2019-12-07 17:40:11,366 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2019-12-07 17:40:11,366 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2019-12-07 17:40:11,366 INFO L271 PluginConnector]: Initializing Witness Printer... [2019-12-07 17:40:11,366 INFO L275 PluginConnector]: Witness Printer initialized [2019-12-07 17:40:11,366 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.12 05:40:08" (3/4) ... [2019-12-07 17:40:11,368 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2019-12-07 17:40:11,408 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_688fdbf1-6e11-42e8-ab61-985eff1cfd8d/bin/uautomizer/witness.graphml [2019-12-07 17:40:11,408 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2019-12-07 17:40:11,409 INFO L168 Benchmark]: Toolchain (without parser) took 3891.73 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 128.5 MB). Free memory was 952.4 MB in the beginning and 872.2 MB in the end (delta: 80.2 MB). Peak memory consumption was 208.7 MB. Max. memory is 11.5 GB. [2019-12-07 17:40:11,409 INFO L168 Benchmark]: CDTParser took 0.14 ms. Allocated memory is still 1.0 GB. Free memory is still 981.9 MB. There was no memory consumed. Max. memory is 11.5 GB. [2019-12-07 17:40:11,410 INFO L168 Benchmark]: CACSL2BoogieTranslator took 168.56 ms. Allocated memory is still 1.0 GB. Free memory was 952.4 MB in the beginning and 941.6 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. [2019-12-07 17:40:11,410 INFO L168 Benchmark]: Boogie Procedure Inliner took 55.68 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 128.5 MB). Free memory was 941.6 MB in the beginning and 1.1 GB in the end (delta: -170.4 MB). Peak memory consumption was 15.3 MB. Max. memory is 11.5 GB. [2019-12-07 17:40:11,410 INFO L168 Benchmark]: Boogie Preprocessor took 21.36 ms. Allocated memory is still 1.2 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB. [2019-12-07 17:40:11,411 INFO L168 Benchmark]: RCFGBuilder took 245.89 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 17.4 MB). Peak memory consumption was 17.4 MB. Max. memory is 11.5 GB. [2019-12-07 17:40:11,411 INFO L168 Benchmark]: TraceAbstraction took 3354.46 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 872.2 MB in the end (delta: 216.0 MB). Peak memory consumption was 216.0 MB. Max. memory is 11.5 GB. [2019-12-07 17:40:11,411 INFO L168 Benchmark]: Witness Printer took 42.05 ms. Allocated memory is still 1.2 GB. Free memory is still 872.2 MB. There was no memory consumed. Max. memory is 11.5 GB. [2019-12-07 17:40:11,413 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.14 ms. Allocated memory is still 1.0 GB. Free memory is still 981.9 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 168.56 ms. Allocated memory is still 1.0 GB. Free memory was 952.4 MB in the beginning and 941.6 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. * Boogie Procedure Inliner took 55.68 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 128.5 MB). Free memory was 941.6 MB in the beginning and 1.1 GB in the end (delta: -170.4 MB). Peak memory consumption was 15.3 MB. Max. memory is 11.5 GB. * Boogie Preprocessor took 21.36 ms. Allocated memory is still 1.2 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB. * RCFGBuilder took 245.89 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 17.4 MB). Peak memory consumption was 17.4 MB. Max. memory is 11.5 GB. * TraceAbstraction took 3354.46 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 872.2 MB in the end (delta: 216.0 MB). Peak memory consumption was 216.0 MB. Max. memory is 11.5 GB. * Witness Printer took 42.05 ms. Allocated memory is still 1.2 GB. Free memory is still 872.2 MB. There was no memory consumed. 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: [L17] char string_A[5], string_B[5]; [L18] int i, j, nc_A, nc_B, found=0; [L21] i=0 [L21] COND TRUE i<5 [L22] string_A[i]=__VERIFIER_nondet_char() [L21] i++ [L21] COND TRUE i<5 [L22] string_A[i]=__VERIFIER_nondet_char() [L21] i++ [L21] COND TRUE i<5 [L22] string_A[i]=__VERIFIER_nondet_char() [L21] i++ [L21] COND TRUE i<5 [L22] string_A[i]=__VERIFIER_nondet_char() [L21] i++ [L21] COND TRUE i<5 [L22] string_A[i]=__VERIFIER_nondet_char() [L21] i++ [L21] COND FALSE !(i<5) [L23] EXPR string_A[5 -1] [L23] COND FALSE !(!(string_A[5 -1]=='\0')) [L25] i=0 [L25] COND TRUE i<5 [L26] string_B[i]=__VERIFIER_nondet_char() [L25] i++ [L25] COND TRUE i<5 [L26] string_B[i]=__VERIFIER_nondet_char() [L25] i++ [L25] COND TRUE i<5 [L26] string_B[i]=__VERIFIER_nondet_char() [L25] i++ [L25] COND TRUE i<5 [L26] string_B[i]=__VERIFIER_nondet_char() [L25] i++ [L25] COND TRUE i<5 [L26] string_B[i]=__VERIFIER_nondet_char() [L25] i++ [L25] COND FALSE !(i<5) [L27] EXPR string_B[5 -1] [L27] COND FALSE !(!(string_B[5 -1]=='\0')) [L29] nc_A = 0 [L30] EXPR string_A[nc_A] [L30] COND TRUE string_A[nc_A]!='\0' [L31] nc_A++ [L30] EXPR string_A[nc_A] [L30] COND FALSE !(string_A[nc_A]!='\0') [L33] nc_B = 0 [L34] EXPR string_B[nc_B] [L34] COND TRUE string_B[nc_B]!='\0' [L35] nc_B++ [L34] EXPR string_B[nc_B] [L34] COND FALSE !(string_B[nc_B]!='\0') [L37] COND FALSE !(!(nc_B >= nc_A)) [L40] EXPR j=0 [L40] i=j=0 [L41] COND TRUE (inc_B-1)<