./Ultimate.py --spec /storage/repos/svcomp/c/properties/unreach-call.prp --file /storage/repos/svcomp/c/loops/string_false-unreach-call_true-termination.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 91b1670e Calling Ultimate with: java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx12G -Xms1G -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerReach.xml -i /storage/repos/svcomp/c/loops/string_false-unreach-call_true-termination.i -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --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: java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx12G -Xms1G -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerReach.xml -i /storage/repos/svcomp/c/loops/string_false-unreach-call_true-termination.i -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --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 0.1.24-91b1670 [2018-11-28 18:17:07,764 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-11-28 18:17:07,765 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-11-28 18:17:07,785 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-11-28 18:17:07,786 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-11-28 18:17:07,788 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-11-28 18:17:07,790 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-11-28 18:17:07,792 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-11-28 18:17:07,795 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-11-28 18:17:07,798 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-11-28 18:17:07,800 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-11-28 18:17:07,801 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-11-28 18:17:07,803 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-11-28 18:17:07,805 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-11-28 18:17:07,814 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-11-28 18:17:07,815 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-11-28 18:17:07,817 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-11-28 18:17:07,821 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-11-28 18:17:07,825 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-11-28 18:17:07,826 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-11-28 18:17:07,827 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-11-28 18:17:07,829 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-11-28 18:17:07,831 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-11-28 18:17:07,831 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-11-28 18:17:07,831 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-11-28 18:17:07,832 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-11-28 18:17:07,833 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-11-28 18:17:07,834 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-11-28 18:17:07,835 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-11-28 18:17:07,836 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-11-28 18:17:07,836 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-11-28 18:17:07,837 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-11-28 18:17:07,837 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-11-28 18:17:07,837 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-11-28 18:17:07,839 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-11-28 18:17:07,839 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-11-28 18:17:07,840 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2018-11-28 18:17:07,855 INFO L110 SettingsManager]: Loading preferences was successful [2018-11-28 18:17:07,856 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-11-28 18:17:07,856 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-11-28 18:17:07,857 INFO L133 SettingsManager]: * ... calls to implemented procedures=ONLY_FOR_CONCURRENT_PROGRAMS [2018-11-28 18:17:07,858 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-11-28 18:17:07,858 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-11-28 18:17:07,858 INFO L133 SettingsManager]: * Use SBE=true [2018-11-28 18:17:07,858 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-11-28 18:17:07,858 INFO L133 SettingsManager]: * sizeof long=4 [2018-11-28 18:17:07,858 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-11-28 18:17:07,859 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-11-28 18:17:07,859 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-11-28 18:17:07,859 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-11-28 18:17:07,859 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-11-28 18:17:07,859 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-11-28 18:17:07,860 INFO L133 SettingsManager]: * sizeof long double=12 [2018-11-28 18:17:07,861 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-11-28 18:17:07,861 INFO L133 SettingsManager]: * Use constant arrays=true [2018-11-28 18:17:07,861 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-11-28 18:17:07,862 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-11-28 18:17:07,862 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-11-28 18:17:07,862 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-11-28 18:17:07,862 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-11-28 18:17:07,863 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-11-28 18:17:07,863 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-11-28 18:17:07,863 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-11-28 18:17:07,863 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-11-28 18:17:07,863 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-11-28 18:17:07,864 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-11-28 18:17:07,865 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-11-28 18:17:07,865 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true 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 -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux 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 [2018-11-28 18:17:07,901 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-11-28 18:17:07,913 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-11-28 18:17:07,917 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-11-28 18:17:07,918 INFO L271 PluginConnector]: Initializing CDTParser... [2018-11-28 18:17:07,919 INFO L276 PluginConnector]: CDTParser initialized [2018-11-28 18:17:07,919 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/svcomp/c/loops/string_false-unreach-call_true-termination.i [2018-11-28 18:17:07,980 INFO L221 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/dbdfec3bf/923367c50cd94cf3bf4194c7c54f39dc/FLAG80c22fb27 [2018-11-28 18:17:08,399 INFO L307 CDTParser]: Found 1 translation units. [2018-11-28 18:17:08,400 INFO L161 CDTParser]: Scanning /storage/repos/svcomp/c/loops/string_false-unreach-call_true-termination.i [2018-11-28 18:17:08,407 INFO L355 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/dbdfec3bf/923367c50cd94cf3bf4194c7c54f39dc/FLAG80c22fb27 [2018-11-28 18:17:08,779 INFO L363 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/dbdfec3bf/923367c50cd94cf3bf4194c7c54f39dc [2018-11-28 18:17:08,782 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-11-28 18:17:08,784 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2018-11-28 18:17:08,785 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-11-28 18:17:08,785 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-11-28 18:17:08,790 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-11-28 18:17:08,791 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.11 06:17:08" (1/1) ... [2018-11-28 18:17:08,794 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@67394605 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 06:17:08, skipping insertion in model container [2018-11-28 18:17:08,794 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.11 06:17:08" (1/1) ... [2018-11-28 18:17:08,803 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-11-28 18:17:08,824 INFO L176 MainTranslator]: Built tables and reachable declarations [2018-11-28 18:17:09,109 INFO L203 PostProcessor]: Analyzing one entry point: main [2018-11-28 18:17:09,122 INFO L191 MainTranslator]: Completed pre-run [2018-11-28 18:17:09,162 INFO L203 PostProcessor]: Analyzing one entry point: main [2018-11-28 18:17:09,194 INFO L195 MainTranslator]: Completed translation [2018-11-28 18:17:09,195 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 06:17:09 WrapperNode [2018-11-28 18:17:09,195 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-11-28 18:17:09,196 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-11-28 18:17:09,196 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-11-28 18:17:09,196 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-11-28 18:17:09,208 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 06:17:09" (1/1) ... [2018-11-28 18:17:09,218 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 06:17:09" (1/1) ... [2018-11-28 18:17:09,231 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-11-28 18:17:09,233 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-11-28 18:17:09,233 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-11-28 18:17:09,233 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-11-28 18:17:09,245 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 06:17:09" (1/1) ... [2018-11-28 18:17:09,245 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 06:17:09" (1/1) ... [2018-11-28 18:17:09,255 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 06:17:09" (1/1) ... [2018-11-28 18:17:09,256 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 06:17:09" (1/1) ... [2018-11-28 18:17:09,277 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 06:17:09" (1/1) ... [2018-11-28 18:17:09,294 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 06:17:09" (1/1) ... [2018-11-28 18:17:09,302 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 06:17:09" (1/1) ... [2018-11-28 18:17:09,307 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-11-28 18:17:09,308 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-11-28 18:17:09,308 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-11-28 18:17:09,308 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-11-28 18:17:09,309 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 06:17:09" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-11-28 18:17:09,464 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2018-11-28 18:17:09,465 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-11-28 18:17:09,465 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-11-28 18:17:09,465 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-11-28 18:17:09,465 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-11-28 18:17:09,465 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-11-28 18:17:09,466 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2018-11-28 18:17:09,466 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-11-28 18:17:09,466 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-11-28 18:17:09,466 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-11-28 18:17:09,466 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-11-28 18:17:09,466 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-11-28 18:17:09,994 INFO L275 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-11-28 18:17:09,995 INFO L280 CfgBuilder]: Removed 5 assue(true) statements. [2018-11-28 18:17:09,995 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 06:17:09 BoogieIcfgContainer [2018-11-28 18:17:09,995 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-11-28 18:17:09,996 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-11-28 18:17:09,997 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-11-28 18:17:10,001 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-11-28 18:17:10,001 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 28.11 06:17:08" (1/3) ... [2018-11-28 18:17:10,003 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@49950091 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.11 06:17:10, skipping insertion in model container [2018-11-28 18:17:10,003 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 06:17:09" (2/3) ... [2018-11-28 18:17:10,003 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@49950091 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.11 06:17:10, skipping insertion in model container [2018-11-28 18:17:10,003 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 06:17:09" (3/3) ... [2018-11-28 18:17:10,006 INFO L112 eAbstractionObserver]: Analyzing ICFG string_false-unreach-call_true-termination.i [2018-11-28 18:17:10,018 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-11-28 18:17:10,027 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-11-28 18:17:10,047 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-11-28 18:17:10,085 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-11-28 18:17:10,086 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-11-28 18:17:10,086 INFO L383 AbstractCegarLoop]: Hoare is true [2018-11-28 18:17:10,086 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-11-28 18:17:10,087 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-11-28 18:17:10,087 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-11-28 18:17:10,089 INFO L387 AbstractCegarLoop]: Difference is false [2018-11-28 18:17:10,089 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-11-28 18:17:10,089 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-11-28 18:17:10,116 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states. [2018-11-28 18:17:10,122 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-11-28 18:17:10,122 INFO L394 BasicCegarLoop]: Found error trace [2018-11-28 18:17:10,123 INFO L402 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] [2018-11-28 18:17:10,126 INFO L423 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-28 18:17:10,132 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-28 18:17:10,132 INFO L82 PathProgramCache]: Analyzing trace with hash -99599224, now seen corresponding path program 1 times [2018-11-28 18:17:10,134 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-28 18:17:10,135 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-28 18:17:10,183 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-28 18:17:10,183 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-28 18:17:10,183 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-28 18:17:10,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-28 18:17:10,268 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-28 18:17:10,270 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-28 18:17:10,274 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-11-28 18:17:10,278 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-11-28 18:17:10,293 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-11-28 18:17:10,294 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-11-28 18:17:10,297 INFO L87 Difference]: Start difference. First operand 35 states. Second operand 2 states. [2018-11-28 18:17:10,321 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-28 18:17:10,321 INFO L93 Difference]: Finished difference Result 62 states and 89 transitions. [2018-11-28 18:17:10,321 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-11-28 18:17:10,322 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 22 [2018-11-28 18:17:10,323 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-28 18:17:10,332 INFO L225 Difference]: With dead ends: 62 [2018-11-28 18:17:10,332 INFO L226 Difference]: Without dead ends: 28 [2018-11-28 18:17:10,335 INFO L631 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 [2018-11-28 18:17:10,351 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-11-28 18:17:10,367 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2018-11-28 18:17:10,369 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2018-11-28 18:17:10,370 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 33 transitions. [2018-11-28 18:17:10,372 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 33 transitions. Word has length 22 [2018-11-28 18:17:10,372 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-28 18:17:10,372 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 33 transitions. [2018-11-28 18:17:10,372 INFO L481 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-11-28 18:17:10,372 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 33 transitions. [2018-11-28 18:17:10,373 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-11-28 18:17:10,373 INFO L394 BasicCegarLoop]: Found error trace [2018-11-28 18:17:10,374 INFO L402 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, 1, 1] [2018-11-28 18:17:10,374 INFO L423 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-28 18:17:10,374 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-28 18:17:10,374 INFO L82 PathProgramCache]: Analyzing trace with hash 930552028, now seen corresponding path program 1 times [2018-11-28 18:17:10,374 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-28 18:17:10,375 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-28 18:17:10,376 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-28 18:17:10,376 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-28 18:17:10,376 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-28 18:17:10,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-28 18:17:10,481 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-28 18:17:10,481 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-28 18:17:10,481 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-11-28 18:17:10,483 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-11-28 18:17:10,483 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-11-28 18:17:10,483 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-11-28 18:17:10,484 INFO L87 Difference]: Start difference. First operand 28 states and 33 transitions. Second operand 3 states. [2018-11-28 18:17:10,760 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-28 18:17:10,761 INFO L93 Difference]: Finished difference Result 56 states and 69 transitions. [2018-11-28 18:17:10,761 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-11-28 18:17:10,761 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2018-11-28 18:17:10,762 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-28 18:17:10,765 INFO L225 Difference]: With dead ends: 56 [2018-11-28 18:17:10,766 INFO L226 Difference]: Without dead ends: 36 [2018-11-28 18:17:10,767 INFO L631 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 [2018-11-28 18:17:10,768 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-11-28 18:17:10,775 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 30. [2018-11-28 18:17:10,775 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-11-28 18:17:10,776 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 35 transitions. [2018-11-28 18:17:10,776 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 35 transitions. Word has length 24 [2018-11-28 18:17:10,776 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-28 18:17:10,777 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 35 transitions. [2018-11-28 18:17:10,777 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-11-28 18:17:10,778 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 35 transitions. [2018-11-28 18:17:10,778 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-11-28 18:17:10,779 INFO L394 BasicCegarLoop]: Found error trace [2018-11-28 18:17:10,779 INFO L402 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, 1, 1, 1, 1, 1, 1] [2018-11-28 18:17:10,780 INFO L423 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-28 18:17:10,780 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-28 18:17:10,780 INFO L82 PathProgramCache]: Analyzing trace with hash 1358146588, now seen corresponding path program 1 times [2018-11-28 18:17:10,780 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-28 18:17:10,780 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-28 18:17:10,783 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-28 18:17:10,783 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-28 18:17:10,783 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-28 18:17:10,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-28 18:17:10,893 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-11-28 18:17:10,893 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-28 18:17:10,894 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-28 18:17:10,910 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-28 18:17:10,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-28 18:17:10,964 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-28 18:17:11,060 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-11-28 18:17:11,083 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-28 18:17:11,083 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2018-11-28 18:17:11,083 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-11-28 18:17:11,084 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-11-28 18:17:11,084 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2018-11-28 18:17:11,084 INFO L87 Difference]: Start difference. First operand 30 states and 35 transitions. Second operand 5 states. [2018-11-28 18:17:11,250 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-28 18:17:11,250 INFO L93 Difference]: Finished difference Result 65 states and 80 transitions. [2018-11-28 18:17:11,251 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-11-28 18:17:11,251 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 28 [2018-11-28 18:17:11,251 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-28 18:17:11,252 INFO L225 Difference]: With dead ends: 65 [2018-11-28 18:17:11,253 INFO L226 Difference]: Without dead ends: 44 [2018-11-28 18:17:11,254 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2018-11-28 18:17:11,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2018-11-28 18:17:11,259 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 34. [2018-11-28 18:17:11,259 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2018-11-28 18:17:11,261 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 39 transitions. [2018-11-28 18:17:11,261 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 39 transitions. Word has length 28 [2018-11-28 18:17:11,261 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-28 18:17:11,261 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 39 transitions. [2018-11-28 18:17:11,261 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-11-28 18:17:11,262 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 39 transitions. [2018-11-28 18:17:11,262 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-11-28 18:17:11,263 INFO L394 BasicCegarLoop]: Found error trace [2018-11-28 18:17:11,263 INFO L402 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, 1, 1, 1, 1, 1, 1] [2018-11-28 18:17:11,263 INFO L423 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-28 18:17:11,264 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-28 18:17:11,264 INFO L82 PathProgramCache]: Analyzing trace with hash -1752396196, now seen corresponding path program 2 times [2018-11-28 18:17:11,264 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-28 18:17:11,264 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-28 18:17:11,265 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-28 18:17:11,265 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-28 18:17:11,266 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-28 18:17:11,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-28 18:17:11,556 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-11-28 18:17:11,557 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-28 18:17:11,557 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-28 18:17:11,580 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-11-28 18:17:11,650 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-11-28 18:17:11,650 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-28 18:17:11,656 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-28 18:17:11,733 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-11-28 18:17:11,763 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-28 18:17:11,763 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2018-11-28 18:17:11,764 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-11-28 18:17:11,764 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-11-28 18:17:11,764 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2018-11-28 18:17:11,766 INFO L87 Difference]: Start difference. First operand 34 states and 39 transitions. Second operand 6 states. [2018-11-28 18:17:12,073 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-28 18:17:12,073 INFO L93 Difference]: Finished difference Result 75 states and 92 transitions. [2018-11-28 18:17:12,076 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-11-28 18:17:12,076 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 32 [2018-11-28 18:17:12,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-28 18:17:12,078 INFO L225 Difference]: With dead ends: 75 [2018-11-28 18:17:12,078 INFO L226 Difference]: Without dead ends: 52 [2018-11-28 18:17:12,079 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2018-11-28 18:17:12,079 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2018-11-28 18:17:12,086 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 38. [2018-11-28 18:17:12,086 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-11-28 18:17:12,087 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 43 transitions. [2018-11-28 18:17:12,087 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 43 transitions. Word has length 32 [2018-11-28 18:17:12,088 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-28 18:17:12,088 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 43 transitions. [2018-11-28 18:17:12,088 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-11-28 18:17:12,088 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 43 transitions. [2018-11-28 18:17:12,089 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-11-28 18:17:12,089 INFO L394 BasicCegarLoop]: Found error trace [2018-11-28 18:17:12,090 INFO L402 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, 1, 1, 1, 1, 1, 1] [2018-11-28 18:17:12,090 INFO L423 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-28 18:17:12,090 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-28 18:17:12,090 INFO L82 PathProgramCache]: Analyzing trace with hash -800948324, now seen corresponding path program 3 times [2018-11-28 18:17:12,091 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-28 18:17:12,091 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-28 18:17:12,092 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-28 18:17:12,092 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-28 18:17:12,092 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-28 18:17:12,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-28 18:17:12,224 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-11-28 18:17:12,224 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-28 18:17:12,224 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-28 18:17:12,242 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-28 18:17:12,296 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-11-28 18:17:12,296 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-28 18:17:12,300 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-28 18:17:12,329 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-11-28 18:17:12,351 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-28 18:17:12,352 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2018-11-28 18:17:12,352 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-11-28 18:17:12,352 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-11-28 18:17:12,353 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-11-28 18:17:12,353 INFO L87 Difference]: Start difference. First operand 38 states and 43 transitions. Second operand 7 states. [2018-11-28 18:17:12,813 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-28 18:17:12,813 INFO L93 Difference]: Finished difference Result 85 states and 104 transitions. [2018-11-28 18:17:12,815 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-11-28 18:17:12,816 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 36 [2018-11-28 18:17:12,816 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-28 18:17:12,817 INFO L225 Difference]: With dead ends: 85 [2018-11-28 18:17:12,817 INFO L226 Difference]: Without dead ends: 60 [2018-11-28 18:17:12,818 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-11-28 18:17:12,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2018-11-28 18:17:12,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 42. [2018-11-28 18:17:12,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-11-28 18:17:12,825 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 47 transitions. [2018-11-28 18:17:12,826 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 47 transitions. Word has length 36 [2018-11-28 18:17:12,826 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-28 18:17:12,826 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 47 transitions. [2018-11-28 18:17:12,826 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-11-28 18:17:12,826 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 47 transitions. [2018-11-28 18:17:12,827 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2018-11-28 18:17:12,827 INFO L394 BasicCegarLoop]: Found error trace [2018-11-28 18:17:12,828 INFO L402 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, 1, 1, 1, 1, 1, 1] [2018-11-28 18:17:12,828 INFO L423 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-28 18:17:12,828 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-28 18:17:12,829 INFO L82 PathProgramCache]: Analyzing trace with hash 1655062492, now seen corresponding path program 4 times [2018-11-28 18:17:12,829 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-28 18:17:12,829 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-28 18:17:12,830 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-28 18:17:12,830 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-28 18:17:12,830 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-28 18:17:12,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-28 18:17:12,955 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2018-11-28 18:17:12,956 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-28 18:17:12,956 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-28 18:17:12,976 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-28 18:17:13,013 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-28 18:17:13,013 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-28 18:17:13,020 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-28 18:17:13,126 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2018-11-28 18:17:13,158 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-28 18:17:13,158 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2018-11-28 18:17:13,159 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-11-28 18:17:13,159 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-11-28 18:17:13,160 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2018-11-28 18:17:13,160 INFO L87 Difference]: Start difference. First operand 42 states and 47 transitions. Second operand 8 states. [2018-11-28 18:17:13,562 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-28 18:17:13,562 INFO L93 Difference]: Finished difference Result 93 states and 114 transitions. [2018-11-28 18:17:13,563 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-11-28 18:17:13,563 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 40 [2018-11-28 18:17:13,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-28 18:17:13,564 INFO L225 Difference]: With dead ends: 93 [2018-11-28 18:17:13,564 INFO L226 Difference]: Without dead ends: 66 [2018-11-28 18:17:13,565 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2018-11-28 18:17:13,565 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2018-11-28 18:17:13,579 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 46. [2018-11-28 18:17:13,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2018-11-28 18:17:13,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 51 transitions. [2018-11-28 18:17:13,580 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 51 transitions. Word has length 40 [2018-11-28 18:17:13,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-28 18:17:13,581 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 51 transitions. [2018-11-28 18:17:13,581 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-11-28 18:17:13,581 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 51 transitions. [2018-11-28 18:17:13,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-11-28 18:17:13,582 INFO L394 BasicCegarLoop]: Found error trace [2018-11-28 18:17:13,582 INFO L402 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, 1, 1, 1, 1] [2018-11-28 18:17:13,583 INFO L423 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-28 18:17:13,583 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-28 18:17:13,583 INFO L82 PathProgramCache]: Analyzing trace with hash 349736732, now seen corresponding path program 5 times [2018-11-28 18:17:13,583 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-28 18:17:13,583 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-28 18:17:13,584 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-28 18:17:13,585 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-28 18:17:13,585 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-28 18:17:13,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-11-28 18:17:13,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-11-28 18:17:13,709 INFO L469 BasicCegarLoop]: Counterexample might be feasible [2018-11-28 18:17:13,762 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 28.11 06:17:13 BoogieIcfgContainer [2018-11-28 18:17:13,763 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-11-28 18:17:13,764 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2018-11-28 18:17:13,764 INFO L271 PluginConnector]: Initializing Witness Printer... [2018-11-28 18:17:13,764 INFO L276 PluginConnector]: Witness Printer initialized [2018-11-28 18:17:13,765 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 06:17:09" (3/4) ... [2018-11-28 18:17:13,768 INFO L147 WitnessPrinter]: No result that supports witness generation found [2018-11-28 18:17:13,769 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2018-11-28 18:17:13,769 INFO L168 Benchmark]: Toolchain (without parser) took 4986.45 ms. Allocated memory was 1.0 GB in the beginning and 1.1 GB in the end (delta: 70.3 MB). Free memory was 951.4 MB in the beginning and 867.8 MB in the end (delta: 83.6 MB). Peak memory consumption was 153.8 MB. Max. memory is 11.5 GB. [2018-11-28 18:17:13,771 INFO L168 Benchmark]: CDTParser took 0.18 ms. Allocated memory is still 1.0 GB. Free memory is still 978.2 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-11-28 18:17:13,772 INFO L168 Benchmark]: CACSL2BoogieTranslator took 410.16 ms. Allocated memory is still 1.0 GB. Free memory was 951.4 MB in the beginning and 940.6 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. [2018-11-28 18:17:13,773 INFO L168 Benchmark]: Boogie Procedure Inliner took 36.69 ms. Allocated memory is still 1.0 GB. Free memory is still 940.6 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-11-28 18:17:13,773 INFO L168 Benchmark]: Boogie Preprocessor took 74.86 ms. Allocated memory is still 1.0 GB. Free memory was 940.6 MB in the beginning and 935.2 MB in the end (delta: 5.4 MB). Peak memory consumption was 5.4 MB. Max. memory is 11.5 GB. [2018-11-28 18:17:13,774 INFO L168 Benchmark]: RCFGBuilder took 687.53 ms. Allocated memory was 1.0 GB in the beginning and 1.1 GB in the end (delta: 70.3 MB). Free memory was 935.2 MB in the beginning and 1.0 GB in the end (delta: -94.5 MB). Peak memory consumption was 13.5 MB. Max. memory is 11.5 GB. [2018-11-28 18:17:13,775 INFO L168 Benchmark]: TraceAbstraction took 3766.39 ms. Allocated memory is still 1.1 GB. Free memory was 1.0 GB in the beginning and 867.8 MB in the end (delta: 161.9 MB). Peak memory consumption was 161.9 MB. Max. memory is 11.5 GB. [2018-11-28 18:17:13,776 INFO L168 Benchmark]: Witness Printer took 5.01 ms. Allocated memory is still 1.1 GB. Free memory is still 867.8 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-11-28 18:17:13,781 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.18 ms. Allocated memory is still 1.0 GB. Free memory is still 978.2 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 410.16 ms. Allocated memory is still 1.0 GB. Free memory was 951.4 MB in the beginning and 940.6 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 36.69 ms. Allocated memory is still 1.0 GB. Free memory is still 940.6 MB. There was no memory consumed. Max. memory is 11.5 GB. * Boogie Preprocessor took 74.86 ms. Allocated memory is still 1.0 GB. Free memory was 940.6 MB in the beginning and 935.2 MB in the end (delta: 5.4 MB). Peak memory consumption was 5.4 MB. Max. memory is 11.5 GB. * RCFGBuilder took 687.53 ms. Allocated memory was 1.0 GB in the beginning and 1.1 GB in the end (delta: 70.3 MB). Free memory was 935.2 MB in the beginning and 1.0 GB in the end (delta: -94.5 MB). Peak memory consumption was 13.5 MB. Max. memory is 11.5 GB. * TraceAbstraction took 3766.39 ms. Allocated memory is still 1.1 GB. Free memory was 1.0 GB in the beginning and 867.8 MB in the end (delta: 161.9 MB). Peak memory consumption was 161.9 MB. Max. memory is 11.5 GB. * Witness Printer took 5.01 ms. Allocated memory is still 1.1 GB. Free memory is still 867.8 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 VAL [found=0, i=0, string_A={7:0}, string_B={10:0}] [L21] COND TRUE i<5 [L22] string_A[i]=__VERIFIER_nondet_char() [L21] i++ VAL [found=0, i=1, string_A={7:0}, string_B={10:0}] [L21] COND TRUE i<5 [L22] string_A[i]=__VERIFIER_nondet_char() [L21] i++ VAL [found=0, i=2, string_A={7:0}, string_B={10:0}] [L21] COND TRUE i<5 [L22] string_A[i]=__VERIFIER_nondet_char() [L21] i++ VAL [found=0, i=3, string_A={7:0}, string_B={10:0}] [L21] COND TRUE i<5 [L22] string_A[i]=__VERIFIER_nondet_char() [L21] i++ VAL [found=0, i=4, string_A={7:0}, string_B={10:0}] [L21] COND TRUE i<5 [L22] string_A[i]=__VERIFIER_nondet_char() [L21] i++ VAL [found=0, i=5, string_A={7:0}, string_B={10:0}] [L21] COND FALSE !(i<5) VAL [found=0, i=5, string_A={7:0}, string_B={10:0}] [L23] EXPR string_A[5 -1] VAL [found=0, i=5, string_A={7:0}, string_A[5 -1]=0, string_B={10:0}] [L23] COND FALSE !(!(string_A[5 -1]=='\0')) [L25] i=0 VAL [found=0, i=0, string_A={7:0}, string_B={10:0}] [L25] COND TRUE i<5 [L26] string_B[i]=__VERIFIER_nondet_char() [L25] i++ VAL [found=0, i=1, string_A={7:0}, string_B={10:0}] [L25] COND TRUE i<5 [L26] string_B[i]=__VERIFIER_nondet_char() [L25] i++ VAL [found=0, i=2, string_A={7:0}, string_B={10:0}] [L25] COND TRUE i<5 [L26] string_B[i]=__VERIFIER_nondet_char() [L25] i++ VAL [found=0, i=3, string_A={7:0}, string_B={10:0}] [L25] COND TRUE i<5 [L26] string_B[i]=__VERIFIER_nondet_char() [L25] i++ VAL [found=0, i=4, string_A={7:0}, string_B={10:0}] [L25] COND TRUE i<5 [L26] string_B[i]=__VERIFIER_nondet_char() [L25] i++ VAL [found=0, i=5, string_A={7:0}, string_B={10:0}] [L25] COND FALSE !(i<5) VAL [found=0, i=5, string_A={7:0}, string_B={10:0}] [L27] EXPR string_B[5 -1] VAL [found=0, i=5, string_A={7:0}, string_B={10:0}, string_B[5 -1]=0] [L27] COND FALSE !(!(string_B[5 -1]=='\0')) [L29] nc_A = 0 VAL [found=0, i=5, nc_A=0, string_A={7:0}, string_B={10:0}] [L30] EXPR string_A[nc_A] VAL [found=0, i=5, nc_A=0, string_A={7:0}, string_A[nc_A]=0, string_B={10:0}] [L30] COND FALSE !(string_A[nc_A]!='\0') [L33] nc_B = 0 VAL [found=0, i=5, nc_A=0, nc_B=0, string_A={7:0}, string_B={10:0}] [L34] EXPR string_B[nc_B] VAL [found=0, i=5, nc_A=0, nc_B=0, string_A={7:0}, string_B={10:0}, string_B[nc_B]=0] [L34] COND FALSE !(string_B[nc_B]!='\0') [L37] COND FALSE !(!(nc_B >= nc_A)) [L40] EXPR j=0 [L40] i=j=0 VAL [found=0, i=0, j=0, nc_A=0, nc_B=0, string_A={7:0}, string_B={10:0}] [L41] COND FALSE !((inc_B-1)< main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux 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 [2018-11-28 18:17:16,439 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-11-28 18:17:16,453 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-11-28 18:17:16,457 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-11-28 18:17:16,459 INFO L271 PluginConnector]: Initializing CDTParser... [2018-11-28 18:17:16,459 INFO L276 PluginConnector]: CDTParser initialized [2018-11-28 18:17:16,460 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/svcomp/c/loops/string_false-unreach-call_true-termination.i [2018-11-28 18:17:16,520 INFO L221 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4845dc958/4626eb2cd0f5415b861570da43f24872/FLAGd9eb294c6 [2018-11-28 18:17:17,015 INFO L307 CDTParser]: Found 1 translation units. [2018-11-28 18:17:17,016 INFO L161 CDTParser]: Scanning /storage/repos/svcomp/c/loops/string_false-unreach-call_true-termination.i [2018-11-28 18:17:17,023 INFO L355 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4845dc958/4626eb2cd0f5415b861570da43f24872/FLAGd9eb294c6 [2018-11-28 18:17:17,359 INFO L363 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4845dc958/4626eb2cd0f5415b861570da43f24872 [2018-11-28 18:17:17,363 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-11-28 18:17:17,365 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2018-11-28 18:17:17,367 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-11-28 18:17:17,367 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-11-28 18:17:17,372 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-11-28 18:17:17,373 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.11 06:17:17" (1/1) ... [2018-11-28 18:17:17,377 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@71e708f2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 06:17:17, skipping insertion in model container [2018-11-28 18:17:17,377 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.11 06:17:17" (1/1) ... [2018-11-28 18:17:17,386 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-11-28 18:17:17,409 INFO L176 MainTranslator]: Built tables and reachable declarations [2018-11-28 18:17:17,621 INFO L203 PostProcessor]: Analyzing one entry point: main [2018-11-28 18:17:17,627 INFO L191 MainTranslator]: Completed pre-run [2018-11-28 18:17:17,661 INFO L203 PostProcessor]: Analyzing one entry point: main [2018-11-28 18:17:17,687 INFO L195 MainTranslator]: Completed translation [2018-11-28 18:17:17,688 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 06:17:17 WrapperNode [2018-11-28 18:17:17,688 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-11-28 18:17:17,689 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-11-28 18:17:17,689 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-11-28 18:17:17,689 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-11-28 18:17:17,701 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 06:17:17" (1/1) ... [2018-11-28 18:17:17,715 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 06:17:17" (1/1) ... [2018-11-28 18:17:17,727 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-11-28 18:17:17,728 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-11-28 18:17:17,728 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-11-28 18:17:17,728 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-11-28 18:17:17,740 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 06:17:17" (1/1) ... [2018-11-28 18:17:17,741 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 06:17:17" (1/1) ... [2018-11-28 18:17:17,751 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 06:17:17" (1/1) ... [2018-11-28 18:17:17,753 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 06:17:17" (1/1) ... [2018-11-28 18:17:17,781 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 06:17:17" (1/1) ... [2018-11-28 18:17:17,795 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 06:17:17" (1/1) ... [2018-11-28 18:17:17,800 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 06:17:17" (1/1) ... [2018-11-28 18:17:17,808 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-11-28 18:17:17,809 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-11-28 18:17:17,809 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-11-28 18:17:17,809 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-11-28 18:17:17,810 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 06:17:17" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-11-28 18:17:17,956 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-11-28 18:17:17,956 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-11-28 18:17:17,956 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-11-28 18:17:17,956 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE1 [2018-11-28 18:17:17,956 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-11-28 18:17:17,956 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-11-28 18:17:17,957 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-11-28 18:17:17,957 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-11-28 18:17:17,957 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-11-28 18:17:17,957 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-11-28 18:17:17,957 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE1 [2018-11-28 18:17:17,957 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-11-28 18:17:18,499 INFO L275 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-11-28 18:17:18,500 INFO L280 CfgBuilder]: Removed 5 assue(true) statements. [2018-11-28 18:17:18,500 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 06:17:18 BoogieIcfgContainer [2018-11-28 18:17:18,501 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-11-28 18:17:18,502 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-11-28 18:17:18,502 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-11-28 18:17:18,505 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-11-28 18:17:18,506 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 28.11 06:17:17" (1/3) ... [2018-11-28 18:17:18,507 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3e0f04ae and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.11 06:17:18, skipping insertion in model container [2018-11-28 18:17:18,507 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 06:17:17" (2/3) ... [2018-11-28 18:17:18,507 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3e0f04ae and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.11 06:17:18, skipping insertion in model container [2018-11-28 18:17:18,507 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 06:17:18" (3/3) ... [2018-11-28 18:17:18,510 INFO L112 eAbstractionObserver]: Analyzing ICFG string_false-unreach-call_true-termination.i [2018-11-28 18:17:18,519 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-11-28 18:17:18,527 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-11-28 18:17:18,545 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-11-28 18:17:18,581 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-11-28 18:17:18,582 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-11-28 18:17:18,582 INFO L383 AbstractCegarLoop]: Hoare is true [2018-11-28 18:17:18,582 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-11-28 18:17:18,584 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-11-28 18:17:18,584 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-11-28 18:17:18,584 INFO L387 AbstractCegarLoop]: Difference is false [2018-11-28 18:17:18,585 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-11-28 18:17:18,585 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-11-28 18:17:18,606 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states. [2018-11-28 18:17:18,614 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-11-28 18:17:18,614 INFO L394 BasicCegarLoop]: Found error trace [2018-11-28 18:17:18,615 INFO L402 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] [2018-11-28 18:17:18,618 INFO L423 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-28 18:17:18,625 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-28 18:17:18,626 INFO L82 PathProgramCache]: Analyzing trace with hash -99599224, now seen corresponding path program 1 times [2018-11-28 18:17:18,632 INFO L223 ckRefinementStrategy]: Switched to mode CVC4_FPBP [2018-11-28 18:17:18,632 INFO L69 tionRefinementEngine]: Using refinement strategy WolfRefinementStrategy No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 2 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2018-11-28 18:17:18,655 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-28 18:17:18,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-28 18:17:18,739 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-28 18:17:18,760 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-28 18:17:18,760 INFO L312 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2018-11-28 18:17:18,765 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-28 18:17:18,768 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-11-28 18:17:18,773 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-11-28 18:17:18,790 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-11-28 18:17:18,791 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-11-28 18:17:18,793 INFO L87 Difference]: Start difference. First operand 35 states. Second operand 2 states. [2018-11-28 18:17:18,816 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-28 18:17:18,817 INFO L93 Difference]: Finished difference Result 62 states and 89 transitions. [2018-11-28 18:17:18,817 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-11-28 18:17:18,818 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 22 [2018-11-28 18:17:18,819 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-28 18:17:18,829 INFO L225 Difference]: With dead ends: 62 [2018-11-28 18:17:18,829 INFO L226 Difference]: Without dead ends: 28 [2018-11-28 18:17:18,833 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-11-28 18:17:18,853 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-11-28 18:17:18,873 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2018-11-28 18:17:18,874 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2018-11-28 18:17:18,875 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 33 transitions. [2018-11-28 18:17:18,878 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 33 transitions. Word has length 22 [2018-11-28 18:17:18,879 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-28 18:17:18,879 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 33 transitions. [2018-11-28 18:17:18,879 INFO L481 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-11-28 18:17:18,879 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 33 transitions. [2018-11-28 18:17:18,880 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-11-28 18:17:18,881 INFO L394 BasicCegarLoop]: Found error trace [2018-11-28 18:17:18,881 INFO L402 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, 1, 1] [2018-11-28 18:17:18,881 INFO L423 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-28 18:17:18,881 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-28 18:17:18,883 INFO L82 PathProgramCache]: Analyzing trace with hash 930552028, now seen corresponding path program 1 times [2018-11-28 18:17:18,883 INFO L223 ckRefinementStrategy]: Switched to mode CVC4_FPBP [2018-11-28 18:17:18,884 INFO L69 tionRefinementEngine]: Using refinement strategy WolfRefinementStrategy No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 3 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2018-11-28 18:17:18,909 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-28 18:17:18,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-28 18:17:18,970 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-28 18:17:18,999 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-28 18:17:18,999 INFO L312 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2018-11-28 18:17:19,004 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-28 18:17:19,004 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-11-28 18:17:19,006 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-11-28 18:17:19,006 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-11-28 18:17:19,006 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-11-28 18:17:19,011 INFO L87 Difference]: Start difference. First operand 28 states and 33 transitions. Second operand 3 states. [2018-11-28 18:17:19,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-28 18:17:19,342 INFO L93 Difference]: Finished difference Result 56 states and 69 transitions. [2018-11-28 18:17:19,343 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-11-28 18:17:19,343 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2018-11-28 18:17:19,344 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-28 18:17:19,348 INFO L225 Difference]: With dead ends: 56 [2018-11-28 18:17:19,348 INFO L226 Difference]: Without dead ends: 36 [2018-11-28 18:17:19,349 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-11-28 18:17:19,349 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-11-28 18:17:19,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 30. [2018-11-28 18:17:19,357 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-11-28 18:17:19,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 35 transitions. [2018-11-28 18:17:19,359 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 35 transitions. Word has length 24 [2018-11-28 18:17:19,360 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-28 18:17:19,360 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 35 transitions. [2018-11-28 18:17:19,360 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-11-28 18:17:19,360 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 35 transitions. [2018-11-28 18:17:19,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-11-28 18:17:19,362 INFO L394 BasicCegarLoop]: Found error trace [2018-11-28 18:17:19,362 INFO L402 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, 1, 1, 1, 1, 1, 1] [2018-11-28 18:17:19,362 INFO L423 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-28 18:17:19,363 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-28 18:17:19,364 INFO L82 PathProgramCache]: Analyzing trace with hash 1358146588, now seen corresponding path program 1 times [2018-11-28 18:17:19,364 INFO L223 ckRefinementStrategy]: Switched to mode CVC4_FPBP [2018-11-28 18:17:19,364 INFO L69 tionRefinementEngine]: Using refinement strategy WolfRefinementStrategy No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 4 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2018-11-28 18:17:19,392 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-28 18:17:19,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-28 18:17:19,459 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-28 18:17:19,498 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-11-28 18:17:19,498 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-28 18:17:19,702 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-11-28 18:17:19,706 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-28 18:17:19,706 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6 [2018-11-28 18:17:19,707 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-11-28 18:17:19,707 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-11-28 18:17:19,710 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-11-28 18:17:19,713 INFO L87 Difference]: Start difference. First operand 30 states and 35 transitions. Second operand 6 states. [2018-11-28 18:17:20,303 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-28 18:17:20,303 INFO L93 Difference]: Finished difference Result 79 states and 102 transitions. [2018-11-28 18:17:20,306 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-11-28 18:17:20,306 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 28 [2018-11-28 18:17:20,307 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-28 18:17:20,308 INFO L225 Difference]: With dead ends: 79 [2018-11-28 18:17:20,308 INFO L226 Difference]: Without dead ends: 58 [2018-11-28 18:17:20,309 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=19, Invalid=23, Unknown=0, NotChecked=0, Total=42 [2018-11-28 18:17:20,310 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2018-11-28 18:17:20,317 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 42. [2018-11-28 18:17:20,318 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-11-28 18:17:20,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 47 transitions. [2018-11-28 18:17:20,319 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 47 transitions. Word has length 28 [2018-11-28 18:17:20,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-28 18:17:20,320 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 47 transitions. [2018-11-28 18:17:20,320 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-11-28 18:17:20,320 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 47 transitions. [2018-11-28 18:17:20,322 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2018-11-28 18:17:20,322 INFO L394 BasicCegarLoop]: Found error trace [2018-11-28 18:17:20,322 INFO L402 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, 1, 1, 1, 1, 1, 1] [2018-11-28 18:17:20,322 INFO L423 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-28 18:17:20,324 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-28 18:17:20,324 INFO L82 PathProgramCache]: Analyzing trace with hash 1655062492, now seen corresponding path program 2 times [2018-11-28 18:17:20,325 INFO L223 ckRefinementStrategy]: Switched to mode CVC4_FPBP [2018-11-28 18:17:20,325 INFO L69 tionRefinementEngine]: Using refinement strategy WolfRefinementStrategy No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 5 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2018-11-28 18:17:20,351 INFO L101 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2018-11-28 18:17:20,410 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2018-11-28 18:17:20,410 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-28 18:17:20,414 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-28 18:17:20,527 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2018-11-28 18:17:20,527 INFO L312 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [MP cvc4 --incremental --print-success --lang smt --rewrite-divk (5)] Exception during sending of exit command (exit): Broken pipe [2018-11-28 18:17:20,531 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-28 18:17:20,531 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2018-11-28 18:17:20,532 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-11-28 18:17:20,532 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-11-28 18:17:20,533 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2018-11-28 18:17:20,533 INFO L87 Difference]: Start difference. First operand 42 states and 47 transitions. Second operand 8 states. [2018-11-28 18:17:21,147 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-28 18:17:21,147 INFO L93 Difference]: Finished difference Result 68 states and 80 transitions. [2018-11-28 18:17:21,148 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-11-28 18:17:21,148 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 40 [2018-11-28 18:17:21,149 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-28 18:17:21,152 INFO L225 Difference]: With dead ends: 68 [2018-11-28 18:17:21,152 INFO L226 Difference]: Without dead ends: 54 [2018-11-28 18:17:21,153 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=80, Unknown=0, NotChecked=0, Total=110 [2018-11-28 18:17:21,154 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2018-11-28 18:17:21,162 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 47. [2018-11-28 18:17:21,162 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2018-11-28 18:17:21,163 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 53 transitions. [2018-11-28 18:17:21,164 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 53 transitions. Word has length 40 [2018-11-28 18:17:21,164 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-28 18:17:21,164 INFO L480 AbstractCegarLoop]: Abstraction has 47 states and 53 transitions. [2018-11-28 18:17:21,164 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-11-28 18:17:21,165 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 53 transitions. [2018-11-28 18:17:21,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2018-11-28 18:17:21,167 INFO L394 BasicCegarLoop]: Found error trace [2018-11-28 18:17:21,167 INFO L402 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-28 18:17:21,167 INFO L423 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-28 18:17:21,168 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-28 18:17:21,169 INFO L82 PathProgramCache]: Analyzing trace with hash -1489958921, now seen corresponding path program 1 times [2018-11-28 18:17:21,169 INFO L223 ckRefinementStrategy]: Switched to mode CVC4_FPBP [2018-11-28 18:17:21,169 INFO L69 tionRefinementEngine]: Using refinement strategy WolfRefinementStrategy No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 6 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2018-11-28 18:17:21,188 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-28 18:17:21,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-28 18:17:21,275 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-28 18:17:21,346 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2018-11-28 18:17:21,347 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-28 18:17:21,591 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2018-11-28 18:17:21,595 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-28 18:17:21,595 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2018-11-28 18:17:21,595 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-11-28 18:17:21,596 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-11-28 18:17:21,596 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2018-11-28 18:17:21,596 INFO L87 Difference]: Start difference. First operand 47 states and 53 transitions. Second operand 12 states. [2018-11-28 18:17:22,443 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-28 18:17:22,444 INFO L93 Difference]: Finished difference Result 105 states and 128 transitions. [2018-11-28 18:17:22,447 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-11-28 18:17:22,447 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 42 [2018-11-28 18:17:22,447 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-28 18:17:22,448 INFO L225 Difference]: With dead ends: 105 [2018-11-28 18:17:22,449 INFO L226 Difference]: Without dead ends: 73 [2018-11-28 18:17:22,450 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2018-11-28 18:17:22,450 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2018-11-28 18:17:22,457 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 51. [2018-11-28 18:17:22,458 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-11-28 18:17:22,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 57 transitions. [2018-11-28 18:17:22,459 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 57 transitions. Word has length 42 [2018-11-28 18:17:22,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-28 18:17:22,459 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 57 transitions. [2018-11-28 18:17:22,459 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-11-28 18:17:22,460 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 57 transitions. [2018-11-28 18:17:22,460 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-11-28 18:17:22,461 INFO L394 BasicCegarLoop]: Found error trace [2018-11-28 18:17:22,462 INFO L402 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, 1, 1, 1, 1] [2018-11-28 18:17:22,462 INFO L423 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-28 18:17:22,462 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-28 18:17:22,462 INFO L82 PathProgramCache]: Analyzing trace with hash -1777563849, now seen corresponding path program 2 times [2018-11-28 18:17:22,463 INFO L223 ckRefinementStrategy]: Switched to mode CVC4_FPBP [2018-11-28 18:17:22,463 INFO L69 tionRefinementEngine]: Using refinement strategy WolfRefinementStrategy No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 7 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2018-11-28 18:17:22,481 INFO L101 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2018-11-28 18:17:22,536 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2018-11-28 18:17:22,536 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-28 18:17:22,540 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-28 18:17:22,648 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2018-11-28 18:17:22,648 INFO L312 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2018-11-28 18:17:22,650 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-28 18:17:22,650 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2018-11-28 18:17:22,651 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-11-28 18:17:22,651 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-11-28 18:17:22,651 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-11-28 18:17:22,652 INFO L87 Difference]: Start difference. First operand 51 states and 57 transitions. Second operand 6 states. [2018-11-28 18:17:22,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-28 18:17:22,849 INFO L93 Difference]: Finished difference Result 59 states and 66 transitions. [2018-11-28 18:17:22,850 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-11-28 18:17:22,850 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 46 [2018-11-28 18:17:22,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-28 18:17:22,851 INFO L225 Difference]: With dead ends: 59 [2018-11-28 18:17:22,851 INFO L226 Difference]: Without dead ends: 53 [2018-11-28 18:17:22,852 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2018-11-28 18:17:22,853 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2018-11-28 18:17:22,863 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 52. [2018-11-28 18:17:22,863 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2018-11-28 18:17:22,864 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 58 transitions. [2018-11-28 18:17:22,864 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 58 transitions. Word has length 46 [2018-11-28 18:17:22,865 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-28 18:17:22,865 INFO L480 AbstractCegarLoop]: Abstraction has 52 states and 58 transitions. [2018-11-28 18:17:22,865 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-11-28 18:17:22,866 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 58 transitions. [2018-11-28 18:17:22,866 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2018-11-28 18:17:22,866 INFO L394 BasicCegarLoop]: Found error trace [2018-11-28 18:17:22,867 INFO L402 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, 1, 1, 1, 1, 1, 1] [2018-11-28 18:17:22,867 INFO L423 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-28 18:17:22,867 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-28 18:17:22,867 INFO L82 PathProgramCache]: Analyzing trace with hash 1835345178, now seen corresponding path program 1 times [2018-11-28 18:17:22,868 INFO L223 ckRefinementStrategy]: Switched to mode CVC4_FPBP [2018-11-28 18:17:22,868 INFO L69 tionRefinementEngine]: Using refinement strategy WolfRefinementStrategy No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 8 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2018-11-28 18:17:22,885 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-28 18:17:22,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-28 18:17:22,986 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-28 18:17:23,018 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2018-11-28 18:17:23,018 INFO L312 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2018-11-28 18:17:23,020 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-28 18:17:23,020 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2018-11-28 18:17:23,021 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-11-28 18:17:23,021 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-11-28 18:17:23,021 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2018-11-28 18:17:23,022 INFO L87 Difference]: Start difference. First operand 52 states and 58 transitions. Second operand 4 states. [2018-11-28 18:17:23,119 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-28 18:17:23,120 INFO L93 Difference]: Finished difference Result 64 states and 72 transitions. [2018-11-28 18:17:23,121 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-11-28 18:17:23,121 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 48 [2018-11-28 18:17:23,122 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-28 18:17:23,122 INFO L225 Difference]: With dead ends: 64 [2018-11-28 18:17:23,123 INFO L226 Difference]: Without dead ends: 49 [2018-11-28 18:17:23,124 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2018-11-28 18:17:23,124 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-11-28 18:17:23,132 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2018-11-28 18:17:23,132 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2018-11-28 18:17:23,133 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 54 transitions. [2018-11-28 18:17:23,133 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 54 transitions. Word has length 48 [2018-11-28 18:17:23,133 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-28 18:17:23,134 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 54 transitions. [2018-11-28 18:17:23,135 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-11-28 18:17:23,135 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 54 transitions. [2018-11-28 18:17:23,136 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2018-11-28 18:17:23,136 INFO L394 BasicCegarLoop]: Found error trace [2018-11-28 18:17:23,137 INFO L402 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, 1, 1, 1, 1, 1, 1] [2018-11-28 18:17:23,137 INFO L423 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-28 18:17:23,137 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-28 18:17:23,137 INFO L82 PathProgramCache]: Analyzing trace with hash -1547819580, now seen corresponding path program 1 times [2018-11-28 18:17:23,138 INFO L223 ckRefinementStrategy]: Switched to mode CVC4_FPBP [2018-11-28 18:17:23,138 INFO L69 tionRefinementEngine]: Using refinement strategy WolfRefinementStrategy No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 9 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2018-11-28 18:17:23,167 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-28 18:17:23,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-28 18:17:23,298 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-28 18:17:23,352 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2018-11-28 18:17:23,353 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-28 18:17:23,417 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2018-11-28 18:17:23,420 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-28 18:17:23,420 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2018-11-28 18:17:23,420 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-11-28 18:17:23,420 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-11-28 18:17:23,421 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2018-11-28 18:17:23,421 INFO L87 Difference]: Start difference. First operand 49 states and 54 transitions. Second operand 8 states. [2018-11-28 18:17:24,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-28 18:17:24,020 INFO L93 Difference]: Finished difference Result 100 states and 121 transitions. [2018-11-28 18:17:24,021 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-11-28 18:17:24,021 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 48 [2018-11-28 18:17:24,021 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-28 18:17:24,023 INFO L225 Difference]: With dead ends: 100 [2018-11-28 18:17:24,023 INFO L226 Difference]: Without dead ends: 88 [2018-11-28 18:17:24,024 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 89 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=39, Invalid=71, Unknown=0, NotChecked=0, Total=110 [2018-11-28 18:17:24,024 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2018-11-28 18:17:24,036 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 58. [2018-11-28 18:17:24,036 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2018-11-28 18:17:24,037 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 66 transitions. [2018-11-28 18:17:24,037 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 66 transitions. Word has length 48 [2018-11-28 18:17:24,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-28 18:17:24,038 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 66 transitions. [2018-11-28 18:17:24,038 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-11-28 18:17:24,038 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 66 transitions. [2018-11-28 18:17:24,040 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2018-11-28 18:17:24,040 INFO L394 BasicCegarLoop]: Found error trace [2018-11-28 18:17:24,041 INFO L402 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, 1, 1, 1, 1, 1, 1] [2018-11-28 18:17:24,041 INFO L423 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-28 18:17:24,041 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-28 18:17:24,041 INFO L82 PathProgramCache]: Analyzing trace with hash -915073569, now seen corresponding path program 1 times [2018-11-28 18:17:24,043 INFO L223 ckRefinementStrategy]: Switched to mode CVC4_FPBP [2018-11-28 18:17:24,043 INFO L69 tionRefinementEngine]: Using refinement strategy WolfRefinementStrategy No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 10 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2018-11-28 18:17:24,060 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-28 18:17:24,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-11-28 18:17:24,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-11-28 18:17:25,042 INFO L469 BasicCegarLoop]: Counterexample might be feasible [2018-11-28 18:17:25,125 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 28.11 06:17:25 BoogieIcfgContainer [2018-11-28 18:17:25,125 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-11-28 18:17:25,126 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2018-11-28 18:17:25,126 INFO L271 PluginConnector]: Initializing Witness Printer... [2018-11-28 18:17:25,126 INFO L276 PluginConnector]: Witness Printer initialized [2018-11-28 18:17:25,127 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 06:17:18" (3/4) ... [2018-11-28 18:17:25,132 INFO L138 WitnessPrinter]: Generating witness for reachability counterexample [2018-11-28 18:17:25,254 INFO L145 WitnessManager]: Wrote witness to /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/witness.graphml [2018-11-28 18:17:25,255 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2018-11-28 18:17:25,256 INFO L168 Benchmark]: Toolchain (without parser) took 7891.57 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 146.8 MB). Free memory was 946.0 MB in the beginning and 831.8 MB in the end (delta: 114.2 MB). Peak memory consumption was 261.0 MB. Max. memory is 11.5 GB. [2018-11-28 18:17:25,258 INFO L168 Benchmark]: CDTParser took 0.18 ms. Allocated memory is still 1.0 GB. Free memory is still 972.8 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-11-28 18:17:25,258 INFO L168 Benchmark]: CACSL2BoogieTranslator took 321.45 ms. Allocated memory is still 1.0 GB. Free memory was 946.0 MB in the beginning and 935.2 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. [2018-11-28 18:17:25,263 INFO L168 Benchmark]: Boogie Procedure Inliner took 38.44 ms. Allocated memory is still 1.0 GB. Free memory is still 935.2 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-11-28 18:17:25,263 INFO L168 Benchmark]: Boogie Preprocessor took 80.34 ms. Allocated memory is still 1.0 GB. Free memory was 935.2 MB in the beginning and 929.9 MB in the end (delta: 5.4 MB). Peak memory consumption was 5.4 MB. Max. memory is 11.5 GB. [2018-11-28 18:17:25,265 INFO L168 Benchmark]: RCFGBuilder took 691.96 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 146.8 MB). Free memory was 929.9 MB in the beginning and 1.1 GB in the end (delta: -185.8 MB). Peak memory consumption was 13.6 MB. Max. memory is 11.5 GB. [2018-11-28 18:17:25,266 INFO L168 Benchmark]: TraceAbstraction took 6623.85 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 838.5 MB in the end (delta: 277.2 MB). Peak memory consumption was 277.2 MB. Max. memory is 11.5 GB. [2018-11-28 18:17:25,266 INFO L168 Benchmark]: Witness Printer took 128.69 ms. Allocated memory is still 1.2 GB. Free memory was 838.5 MB in the beginning and 831.8 MB in the end (delta: 6.7 MB). Peak memory consumption was 6.7 MB. Max. memory is 11.5 GB. [2018-11-28 18:17:25,278 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.18 ms. Allocated memory is still 1.0 GB. Free memory is still 972.8 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 321.45 ms. Allocated memory is still 1.0 GB. Free memory was 946.0 MB in the beginning and 935.2 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 38.44 ms. Allocated memory is still 1.0 GB. Free memory is still 935.2 MB. There was no memory consumed. Max. memory is 11.5 GB. * Boogie Preprocessor took 80.34 ms. Allocated memory is still 1.0 GB. Free memory was 935.2 MB in the beginning and 929.9 MB in the end (delta: 5.4 MB). Peak memory consumption was 5.4 MB. Max. memory is 11.5 GB. * RCFGBuilder took 691.96 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 146.8 MB). Free memory was 929.9 MB in the beginning and 1.1 GB in the end (delta: -185.8 MB). Peak memory consumption was 13.6 MB. Max. memory is 11.5 GB. * TraceAbstraction took 6623.85 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 838.5 MB in the end (delta: 277.2 MB). Peak memory consumption was 277.2 MB. Max. memory is 11.5 GB. * Witness Printer took 128.69 ms. Allocated memory is still 1.2 GB. Free memory was 838.5 MB in the beginning and 831.8 MB in the end (delta: 6.7 MB). Peak memory consumption was 6.7 MB. 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 VAL [found=0, i=0, string_A={3:0}, string_B={2:0}] [L21] COND TRUE i<5 [L22] string_A[i]=__VERIFIER_nondet_char() [L21] i++ VAL [found=0, i=1, string_A={3:0}, string_B={2:0}] [L21] COND TRUE i<5 [L22] string_A[i]=__VERIFIER_nondet_char() [L21] i++ VAL [found=0, i=2, string_A={3:0}, string_B={2:0}] [L21] COND TRUE i<5 [L22] string_A[i]=__VERIFIER_nondet_char() [L21] i++ VAL [found=0, i=3, string_A={3:0}, string_B={2:0}] [L21] COND TRUE i<5 [L22] string_A[i]=__VERIFIER_nondet_char() [L21] i++ VAL [found=0, i=4, string_A={3:0}, string_B={2:0}] [L21] COND TRUE i<5 [L22] string_A[i]=__VERIFIER_nondet_char() [L21] i++ VAL [found=0, i=5, string_A={3:0}, string_B={2:0}] [L21] COND FALSE !(i<5) VAL [found=0, i=5, string_A={3:0}, string_B={2:0}] [L23] EXPR string_A[5 -1] VAL [found=0, i=5, string_A={3:0}, string_A[5 -1]=0, string_B={2:0}] [L23] COND FALSE !(!(string_A[5 -1]=='\0')) [L25] i=0 VAL [found=0, i=0, string_A={3:0}, string_B={2:0}] [L25] COND TRUE i<5 [L26] string_B[i]=__VERIFIER_nondet_char() [L25] i++ VAL [found=0, i=1, string_A={3:0}, string_B={2:0}] [L25] COND TRUE i<5 [L26] string_B[i]=__VERIFIER_nondet_char() [L25] i++ VAL [found=0, i=2, string_A={3:0}, string_B={2:0}] [L25] COND TRUE i<5 [L26] string_B[i]=__VERIFIER_nondet_char() [L25] i++ VAL [found=0, i=3, string_A={3:0}, string_B={2:0}] [L25] COND TRUE i<5 [L26] string_B[i]=__VERIFIER_nondet_char() [L25] i++ VAL [found=0, i=4, string_A={3:0}, string_B={2:0}] [L25] COND TRUE i<5 [L26] string_B[i]=__VERIFIER_nondet_char() [L25] i++ VAL [found=0, i=5, string_A={3:0}, string_B={2:0}] [L25] COND FALSE !(i<5) VAL [found=0, i=5, string_A={3:0}, string_B={2:0}] [L27] EXPR string_B[5 -1] VAL [found=0, i=5, string_A={3:0}, string_B={2:0}, string_B[5 -1]=0] [L27] COND FALSE !(!(string_B[5 -1]=='\0')) [L29] nc_A = 0 VAL [found=0, i=5, nc_A=0, string_A={3:0}, string_B={2:0}] [L30] EXPR string_A[nc_A] VAL [found=0, i=5, nc_A=0, string_A={3:0}, string_A[nc_A]=1, string_B={2:0}] [L30] COND TRUE string_A[nc_A]!='\0' [L31] nc_A++ VAL [found=0, i=5, nc_A=1, string_A={3:0}, string_B={2:0}] [L30] EXPR string_A[nc_A] VAL [found=0, i=5, nc_A=1, string_A={3:0}, string_A[nc_A]=0, string_B={2:0}] [L30] COND FALSE !(string_A[nc_A]!='\0') [L33] nc_B = 0 VAL [found=0, i=5, nc_A=1, nc_B=0, string_A={3:0}, string_B={2:0}] [L34] EXPR string_B[nc_B] VAL [found=0, i=5, nc_A=1, nc_B=0, string_A={3:0}, string_B={2:0}, string_B[nc_B]=1] [L34] COND TRUE string_B[nc_B]!='\0' [L35] nc_B++ VAL [found=0, i=5, nc_A=1, nc_B=1, string_A={3:0}, string_B={2:0}] [L34] EXPR string_B[nc_B] VAL [found=0, i=5, nc_A=1, nc_B=1, string_A={3:0}, string_B={2:0}, string_B[nc_B]=0] [L34] COND FALSE !(string_B[nc_B]!='\0') [L37] COND FALSE !(!(nc_B >= nc_A)) [L40] EXPR j=0 [L40] i=j=0 VAL [found=0, i=0, j=0, nc_A=1, nc_B=1, string_A={3:0}, string_B={2:0}] [L41] COND TRUE (inc_B-1)<