./Ultimate.py --spec ../../sv-benchmarks/c/ReachSafety.prp --file ../../sv-benchmarks/c/loops/string_false-unreach-call_true-termination.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 1dbac8bc Calling Ultimate with: java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/working_dir_2cf71372-7936-41ce-9463-266dd2834c69/bin-2019/uautomizer/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/working_dir_2cf71372-7936-41ce-9463-266dd2834c69/bin-2019/uautomizer/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/working_dir_2cf71372-7936-41ce-9463-266dd2834c69/bin-2019/uautomizer/data -tc /tmp/vcloud-vcloud-master/worker/working_dir_2cf71372-7936-41ce-9463-266dd2834c69/bin-2019/uautomizer/config/AutomizerReach.xml -i ../../sv-benchmarks/c/loops/string_false-unreach-call_true-termination.i -s /tmp/vcloud-vcloud-master/worker/working_dir_2cf71372-7936-41ce-9463-266dd2834c69/bin-2019/uautomizer/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/working_dir_2cf71372-7936-41ce-9463-266dd2834c69/bin-2019/uautomizer --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(__VERIFIER_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 77cd31699320cd40da64f32a92959020d19291bd ................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis Calling Ultimate with: java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/working_dir_2cf71372-7936-41ce-9463-266dd2834c69/bin-2019/uautomizer/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/working_dir_2cf71372-7936-41ce-9463-266dd2834c69/bin-2019/uautomizer/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/working_dir_2cf71372-7936-41ce-9463-266dd2834c69/bin-2019/uautomizer/data -tc /tmp/vcloud-vcloud-master/worker/working_dir_2cf71372-7936-41ce-9463-266dd2834c69/bin-2019/uautomizer/config/AutomizerReach.xml -i ../../sv-benchmarks/c/loops/string_false-unreach-call_true-termination.i -s /tmp/vcloud-vcloud-master/worker/working_dir_2cf71372-7936-41ce-9463-266dd2834c69/bin-2019/uautomizer/config/svcomp-Reach-32bit-Automizer_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/working_dir_2cf71372-7936-41ce-9463-266dd2834c69/bin-2019/uautomizer --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(__VERIFIER_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 77cd31699320cd40da64f32a92959020d19291bd .................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................. Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE --- Real Ultimate output --- This is Ultimate 0.1.23-1dbac8b [2018-10-26 23:12:31,274 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-26 23:12:31,277 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-26 23:12:31,285 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-26 23:12:31,286 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-26 23:12:31,286 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-26 23:12:31,288 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-26 23:12:31,289 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-26 23:12:31,290 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-26 23:12:31,291 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-26 23:12:31,291 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-26 23:12:31,291 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-26 23:12:31,292 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-26 23:12:31,293 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-26 23:12:31,294 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-26 23:12:31,294 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-26 23:12:31,296 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-26 23:12:31,297 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-26 23:12:31,299 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-26 23:12:31,300 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-26 23:12:31,301 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-26 23:12:31,302 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-26 23:12:31,305 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-26 23:12:31,305 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-26 23:12:31,305 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-26 23:12:31,306 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-26 23:12:31,307 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-26 23:12:31,308 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-26 23:12:31,308 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-26 23:12:31,309 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-26 23:12:31,309 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-26 23:12:31,310 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-10-26 23:12:31,310 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-10-26 23:12:31,310 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-10-26 23:12:31,312 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-10-26 23:12:31,312 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-10-26 23:12:31,312 INFO L98 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/working_dir_2cf71372-7936-41ce-9463-266dd2834c69/bin-2019/uautomizer/config/svcomp-Reach-32bit-Automizer_Default.epf [2018-10-26 23:12:31,324 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-26 23:12:31,324 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-26 23:12:31,324 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-26 23:12:31,325 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-10-26 23:12:31,325 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-10-26 23:12:31,325 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-10-26 23:12:31,325 INFO L133 SettingsManager]: * Use SBE=true [2018-10-26 23:12:31,326 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-26 23:12:31,326 INFO L133 SettingsManager]: * sizeof long=4 [2018-10-26 23:12:31,326 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-26 23:12:31,326 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-10-26 23:12:31,326 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-26 23:12:31,326 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-26 23:12:31,326 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-26 23:12:31,327 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-26 23:12:31,327 INFO L133 SettingsManager]: * sizeof long double=12 [2018-10-26 23:12:31,328 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-26 23:12:31,328 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-26 23:12:31,329 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-26 23:12:31,329 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-26 23:12:31,329 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-26 23:12:31,329 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-26 23:12:31,329 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-26 23:12:31,329 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-26 23:12:31,329 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-26 23:12:31,330 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-26 23:12:31,330 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-10-26 23:12:31,330 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-26 23:12:31,330 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-26 23:12:31,330 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 -> /tmp/vcloud-vcloud-master/worker/working_dir_2cf71372-7936-41ce-9463-266dd2834c69/bin-2019/uautomizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(__VERIFIER_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 77cd31699320cd40da64f32a92959020d19291bd [2018-10-26 23:12:31,358 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-26 23:12:31,369 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-26 23:12:31,372 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-26 23:12:31,372 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-26 23:12:31,373 INFO L276 PluginConnector]: CDTParser initialized [2018-10-26 23:12:31,373 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/working_dir_2cf71372-7936-41ce-9463-266dd2834c69/bin-2019/uautomizer/../../sv-benchmarks/c/loops/string_false-unreach-call_true-termination.i [2018-10-26 23:12:31,414 INFO L218 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_2cf71372-7936-41ce-9463-266dd2834c69/bin-2019/uautomizer/data/28708e264/3d64053de5584cdf8b9e39e2bcb828fe/FLAG734d1dd1c [2018-10-26 23:12:31,831 INFO L298 CDTParser]: Found 1 translation units. [2018-10-26 23:12:31,835 INFO L158 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/working_dir_2cf71372-7936-41ce-9463-266dd2834c69/sv-benchmarks/c/loops/string_false-unreach-call_true-termination.i [2018-10-26 23:12:31,841 INFO L346 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_2cf71372-7936-41ce-9463-266dd2834c69/bin-2019/uautomizer/data/28708e264/3d64053de5584cdf8b9e39e2bcb828fe/FLAG734d1dd1c [2018-10-26 23:12:31,860 INFO L354 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/working_dir_2cf71372-7936-41ce-9463-266dd2834c69/bin-2019/uautomizer/data/28708e264/3d64053de5584cdf8b9e39e2bcb828fe [2018-10-26 23:12:31,863 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-26 23:12:31,864 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-26 23:12:31,865 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-26 23:12:31,865 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-26 23:12:31,871 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-26 23:12:31,871 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.10 11:12:31" (1/1) ... [2018-10-26 23:12:31,874 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4eeeae86 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 11:12:31, skipping insertion in model container [2018-10-26 23:12:31,874 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.10 11:12:31" (1/1) ... [2018-10-26 23:12:31,883 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-26 23:12:31,904 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-26 23:12:32,055 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-26 23:12:32,057 INFO L189 MainTranslator]: Completed pre-run [2018-10-26 23:12:32,077 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-26 23:12:32,093 INFO L193 MainTranslator]: Completed translation [2018-10-26 23:12:32,094 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 11:12:32 WrapperNode [2018-10-26 23:12:32,094 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-26 23:12:32,094 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-26 23:12:32,094 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-26 23:12:32,094 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-26 23:12:32,103 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 11:12:32" (1/1) ... [2018-10-26 23:12:32,103 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 11:12:32" (1/1) ... [2018-10-26 23:12:32,111 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 11:12:32" (1/1) ... [2018-10-26 23:12:32,111 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 11:12:32" (1/1) ... [2018-10-26 23:12:32,117 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 11:12:32" (1/1) ... [2018-10-26 23:12:32,123 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 11:12:32" (1/1) ... [2018-10-26 23:12:32,130 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 11:12:32" (1/1) ... [2018-10-26 23:12:32,132 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-26 23:12:32,132 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-26 23:12:32,132 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-26 23:12:32,133 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-26 23:12:32,133 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 11:12:32" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_2cf71372-7936-41ce-9463-266dd2834c69/bin-2019/uautomizer/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-26 23:12:32,237 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-26 23:12:32,237 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-26 23:12:32,237 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-26 23:12:32,238 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-26 23:12:32,238 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2018-10-26 23:12:32,238 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assume [2018-10-26 23:12:32,238 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-26 23:12:32,238 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2018-10-26 23:12:32,238 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-26 23:12:32,238 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-10-26 23:12:32,238 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2018-10-26 23:12:32,239 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2018-10-26 23:12:32,239 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-10-26 23:12:32,239 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-26 23:12:32,239 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-26 23:12:32,239 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~int [2018-10-26 23:12:32,661 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-26 23:12:32,662 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.10 11:12:32 BoogieIcfgContainer [2018-10-26 23:12:32,662 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-26 23:12:32,663 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-26 23:12:32,663 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-26 23:12:32,665 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-26 23:12:32,665 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 26.10 11:12:31" (1/3) ... [2018-10-26 23:12:32,666 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6e53ba36 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.10 11:12:32, skipping insertion in model container [2018-10-26 23:12:32,666 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 11:12:32" (2/3) ... [2018-10-26 23:12:32,667 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6e53ba36 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.10 11:12:32, skipping insertion in model container [2018-10-26 23:12:32,667 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.10 11:12:32" (3/3) ... [2018-10-26 23:12:32,670 INFO L112 eAbstractionObserver]: Analyzing ICFG string_false-unreach-call_true-termination.i [2018-10-26 23:12:32,678 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-26 23:12:32,685 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-26 23:12:32,697 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-26 23:12:32,717 INFO L135 ementStrategyFactory]: Using default assertion order modulation [2018-10-26 23:12:32,718 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-26 23:12:32,718 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-26 23:12:32,718 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-26 23:12:32,718 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-26 23:12:32,718 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-26 23:12:32,718 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-26 23:12:32,718 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-26 23:12:32,718 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-26 23:12:32,733 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states. [2018-10-26 23:12:32,738 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-10-26 23:12:32,738 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 23:12:32,739 INFO L375 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] [2018-10-26 23:12:32,740 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 23:12:32,745 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 23:12:32,745 INFO L82 PathProgramCache]: Analyzing trace with hash 308783607, now seen corresponding path program 1 times [2018-10-26 23:12:32,746 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-26 23:12:32,747 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-26 23:12:32,778 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 23:12:32,778 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 23:12:32,778 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 23:12:32,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 23:12:32,839 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-26 23:12:32,841 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-26 23:12:32,841 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-26 23:12:32,845 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-26 23:12:32,856 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-26 23:12:32,857 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-26 23:12:32,858 INFO L87 Difference]: Start difference. First operand 64 states. Second operand 2 states. [2018-10-26 23:12:32,878 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 23:12:32,878 INFO L93 Difference]: Finished difference Result 115 states and 142 transitions. [2018-10-26 23:12:32,878 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-26 23:12:32,879 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 24 [2018-10-26 23:12:32,879 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 23:12:32,886 INFO L225 Difference]: With dead ends: 115 [2018-10-26 23:12:32,886 INFO L226 Difference]: Without dead ends: 41 [2018-10-26 23:12:32,889 INFO L605 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 [2018-10-26 23:12:32,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2018-10-26 23:12:32,919 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2018-10-26 23:12:32,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-10-26 23:12:32,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 46 transitions. [2018-10-26 23:12:32,923 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 46 transitions. Word has length 24 [2018-10-26 23:12:32,923 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 23:12:32,923 INFO L481 AbstractCegarLoop]: Abstraction has 41 states and 46 transitions. [2018-10-26 23:12:32,923 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-26 23:12:32,923 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 46 transitions. [2018-10-26 23:12:32,924 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-10-26 23:12:32,924 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 23:12:32,924 INFO L375 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, 1, 1, 1] [2018-10-26 23:12:32,925 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 23:12:32,925 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 23:12:32,925 INFO L82 PathProgramCache]: Analyzing trace with hash -598303112, now seen corresponding path program 1 times [2018-10-26 23:12:32,925 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-26 23:12:32,925 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-26 23:12:32,926 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 23:12:32,926 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 23:12:32,926 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 23:12:32,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 23:12:32,985 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-26 23:12:32,985 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-26 23:12:32,985 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-26 23:12:32,986 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-26 23:12:32,986 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-26 23:12:32,986 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-26 23:12:32,987 INFO L87 Difference]: Start difference. First operand 41 states and 46 transitions. Second operand 3 states. [2018-10-26 23:12:33,239 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 23:12:33,240 INFO L93 Difference]: Finished difference Result 86 states and 99 transitions. [2018-10-26 23:12:33,240 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-26 23:12:33,240 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 31 [2018-10-26 23:12:33,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 23:12:33,244 INFO L225 Difference]: With dead ends: 86 [2018-10-26 23:12:33,244 INFO L226 Difference]: Without dead ends: 58 [2018-10-26 23:12:33,245 INFO L605 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 [2018-10-26 23:12:33,245 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2018-10-26 23:12:33,251 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 45. [2018-10-26 23:12:33,251 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-10-26 23:12:33,252 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 50 transitions. [2018-10-26 23:12:33,252 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 50 transitions. Word has length 31 [2018-10-26 23:12:33,252 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 23:12:33,252 INFO L481 AbstractCegarLoop]: Abstraction has 45 states and 50 transitions. [2018-10-26 23:12:33,253 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-26 23:12:33,253 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 50 transitions. [2018-10-26 23:12:33,253 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-10-26 23:12:33,253 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 23:12:33,254 INFO L375 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 23:12:33,254 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 23:12:33,254 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 23:12:33,254 INFO L82 PathProgramCache]: Analyzing trace with hash 1546214901, now seen corresponding path program 1 times [2018-10-26 23:12:33,254 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-26 23:12:33,254 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-26 23:12:33,257 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 23:12:33,257 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 23:12:33,257 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 23:12:33,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 23:12:33,350 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-26 23:12:33,350 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 23:12:33,350 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_2cf71372-7936-41ce-9463-266dd2834c69/bin-2019/uautomizer/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 [2018-10-26 23:12:33,366 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 23:12:33,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 23:12:33,408 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 23:12:33,442 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-26 23:12:33,463 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-26 23:12:33,463 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2018-10-26 23:12:33,464 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-26 23:12:33,464 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-26 23:12:33,464 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2018-10-26 23:12:33,464 INFO L87 Difference]: Start difference. First operand 45 states and 50 transitions. Second operand 5 states. [2018-10-26 23:12:33,591 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 23:12:33,591 INFO L93 Difference]: Finished difference Result 105 states and 120 transitions. [2018-10-26 23:12:33,593 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-26 23:12:33,593 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 41 [2018-10-26 23:12:33,593 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 23:12:33,594 INFO L225 Difference]: With dead ends: 105 [2018-10-26 23:12:33,594 INFO L226 Difference]: Without dead ends: 75 [2018-10-26 23:12:33,595 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2018-10-26 23:12:33,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2018-10-26 23:12:33,601 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 55. [2018-10-26 23:12:33,601 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2018-10-26 23:12:33,602 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 60 transitions. [2018-10-26 23:12:33,602 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 60 transitions. Word has length 41 [2018-10-26 23:12:33,602 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 23:12:33,602 INFO L481 AbstractCegarLoop]: Abstraction has 55 states and 60 transitions. [2018-10-26 23:12:33,602 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-26 23:12:33,603 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 60 transitions. [2018-10-26 23:12:33,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2018-10-26 23:12:33,604 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 23:12:33,605 INFO L375 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 23:12:33,605 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 23:12:33,605 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 23:12:33,605 INFO L82 PathProgramCache]: Analyzing trace with hash -687417832, now seen corresponding path program 2 times [2018-10-26 23:12:33,605 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-26 23:12:33,605 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-26 23:12:33,606 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 23:12:33,606 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 23:12:33,608 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 23:12:33,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 23:12:33,682 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-10-26 23:12:33,682 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 23:12:33,682 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_2cf71372-7936-41ce-9463-266dd2834c69/bin-2019/uautomizer/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 [2018-10-26 23:12:33,698 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-26 23:12:33,740 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-26 23:12:33,740 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 23:12:33,742 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 23:12:33,758 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-10-26 23:12:33,778 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-26 23:12:33,778 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2018-10-26 23:12:33,779 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-26 23:12:33,779 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-26 23:12:33,779 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2018-10-26 23:12:33,780 INFO L87 Difference]: Start difference. First operand 55 states and 60 transitions. Second operand 6 states. [2018-10-26 23:12:34,001 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 23:12:34,001 INFO L93 Difference]: Finished difference Result 127 states and 144 transitions. [2018-10-26 23:12:34,001 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-26 23:12:34,001 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 51 [2018-10-26 23:12:34,001 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 23:12:34,002 INFO L225 Difference]: With dead ends: 127 [2018-10-26 23:12:34,002 INFO L226 Difference]: Without dead ends: 92 [2018-10-26 23:12:34,003 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2018-10-26 23:12:34,003 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2018-10-26 23:12:34,009 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 65. [2018-10-26 23:12:34,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2018-10-26 23:12:34,010 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 70 transitions. [2018-10-26 23:12:34,010 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 70 transitions. Word has length 51 [2018-10-26 23:12:34,010 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 23:12:34,011 INFO L481 AbstractCegarLoop]: Abstraction has 65 states and 70 transitions. [2018-10-26 23:12:34,011 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-26 23:12:34,012 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 70 transitions. [2018-10-26 23:12:34,012 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2018-10-26 23:12:34,013 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 23:12:34,013 INFO L375 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 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, 1, 1, 1, 1, 1] [2018-10-26 23:12:34,013 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 23:12:34,013 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 23:12:34,013 INFO L82 PathProgramCache]: Analyzing trace with hash -561435307, now seen corresponding path program 3 times [2018-10-26 23:12:34,013 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-26 23:12:34,014 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-26 23:12:34,014 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 23:12:34,014 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 23:12:34,015 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 23:12:34,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 23:12:34,125 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-10-26 23:12:34,125 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 23:12:34,125 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_2cf71372-7936-41ce-9463-266dd2834c69/bin-2019/uautomizer/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 [2018-10-26 23:12:34,142 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-26 23:12:34,235 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-26 23:12:34,235 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 23:12:34,238 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 23:12:34,349 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-10-26 23:12:34,375 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-26 23:12:34,375 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2018-10-26 23:12:34,375 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-26 23:12:34,376 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-26 23:12:34,376 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-10-26 23:12:34,376 INFO L87 Difference]: Start difference. First operand 65 states and 70 transitions. Second operand 7 states. [2018-10-26 23:12:34,557 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 23:12:34,557 INFO L93 Difference]: Finished difference Result 149 states and 168 transitions. [2018-10-26 23:12:34,558 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-26 23:12:34,558 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 61 [2018-10-26 23:12:34,558 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 23:12:34,559 INFO L225 Difference]: With dead ends: 149 [2018-10-26 23:12:34,559 INFO L226 Difference]: Without dead ends: 109 [2018-10-26 23:12:34,559 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-10-26 23:12:34,560 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2018-10-26 23:12:34,566 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 75. [2018-10-26 23:12:34,566 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2018-10-26 23:12:34,567 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 80 transitions. [2018-10-26 23:12:34,567 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 80 transitions. Word has length 61 [2018-10-26 23:12:34,569 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 23:12:34,569 INFO L481 AbstractCegarLoop]: Abstraction has 75 states and 80 transitions. [2018-10-26 23:12:34,569 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-26 23:12:34,569 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 80 transitions. [2018-10-26 23:12:34,571 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2018-10-26 23:12:34,571 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 23:12:34,571 INFO L375 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 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, 1, 1, 1, 1, 1] [2018-10-26 23:12:34,571 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 23:12:34,571 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 23:12:34,572 INFO L82 PathProgramCache]: Analyzing trace with hash 1338516920, now seen corresponding path program 4 times [2018-10-26 23:12:34,572 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-26 23:12:34,572 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-26 23:12:34,573 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 23:12:34,573 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 23:12:34,573 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 23:12:34,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 23:12:34,652 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2018-10-26 23:12:34,652 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 23:12:34,652 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_2cf71372-7936-41ce-9463-266dd2834c69/bin-2019/uautomizer/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 [2018-10-26 23:12:34,663 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-26 23:12:34,699 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-26 23:12:34,699 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 23:12:34,702 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 23:12:34,752 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2018-10-26 23:12:34,768 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-26 23:12:34,768 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2018-10-26 23:12:34,769 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-26 23:12:34,769 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-26 23:12:34,769 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2018-10-26 23:12:34,769 INFO L87 Difference]: Start difference. First operand 75 states and 80 transitions. Second operand 8 states. [2018-10-26 23:12:35,038 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 23:12:35,038 INFO L93 Difference]: Finished difference Result 165 states and 186 transitions. [2018-10-26 23:12:35,039 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-26 23:12:35,039 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 71 [2018-10-26 23:12:35,039 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 23:12:35,040 INFO L225 Difference]: With dead ends: 165 [2018-10-26 23:12:35,040 INFO L226 Difference]: Without dead ends: 120 [2018-10-26 23:12:35,040 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 71 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2018-10-26 23:12:35,040 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2018-10-26 23:12:35,044 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 85. [2018-10-26 23:12:35,044 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2018-10-26 23:12:35,046 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 90 transitions. [2018-10-26 23:12:35,046 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 90 transitions. Word has length 71 [2018-10-26 23:12:35,047 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 23:12:35,047 INFO L481 AbstractCegarLoop]: Abstraction has 85 states and 90 transitions. [2018-10-26 23:12:35,047 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-26 23:12:35,047 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 90 transitions. [2018-10-26 23:12:35,048 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2018-10-26 23:12:35,048 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 23:12:35,048 INFO L375 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 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, 1, 1, 1, 1, 1] [2018-10-26 23:12:35,048 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 23:12:35,049 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 23:12:35,049 INFO L82 PathProgramCache]: Analyzing trace with hash 1460102325, now seen corresponding path program 5 times [2018-10-26 23:12:35,049 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-26 23:12:35,049 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-26 23:12:35,050 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 23:12:35,050 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 23:12:35,050 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 23:12:35,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-10-26 23:12:35,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-10-26 23:12:35,138 INFO L442 BasicCegarLoop]: Counterexample might be feasible [2018-10-26 23:12:35,175 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 26.10 11:12:35 BoogieIcfgContainer [2018-10-26 23:12:35,176 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-26 23:12:35,176 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2018-10-26 23:12:35,176 INFO L271 PluginConnector]: Initializing Witness Printer... [2018-10-26 23:12:35,176 INFO L276 PluginConnector]: Witness Printer initialized [2018-10-26 23:12:35,177 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.10 11:12:32" (3/4) ... [2018-10-26 23:12:35,181 INFO L147 WitnessPrinter]: No result that supports witness generation found [2018-10-26 23:12:35,181 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2018-10-26 23:12:35,182 INFO L168 Benchmark]: Toolchain (without parser) took 3318.40 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 148.9 MB). Free memory was 960.7 MB in the beginning and 927.9 MB in the end (delta: 32.9 MB). Peak memory consumption was 181.7 MB. Max. memory is 11.5 GB. [2018-10-26 23:12:35,183 INFO L168 Benchmark]: CDTParser took 0.11 ms. Allocated memory is still 1.0 GB. Free memory is still 985.4 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-10-26 23:12:35,183 INFO L168 Benchmark]: CACSL2BoogieTranslator took 229.12 ms. Allocated memory is still 1.0 GB. Free memory was 960.7 MB in the beginning and 950.0 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. [2018-10-26 23:12:35,184 INFO L168 Benchmark]: Boogie Preprocessor took 37.74 ms. Allocated memory is still 1.0 GB. Free memory was 950.0 MB in the beginning and 947.3 MB in the end (delta: 2.7 MB). Peak memory consumption was 2.7 MB. Max. memory is 11.5 GB. [2018-10-26 23:12:35,184 INFO L168 Benchmark]: RCFGBuilder took 529.56 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 148.9 MB). Free memory was 947.3 MB in the beginning and 1.1 GB in the end (delta: -179.1 MB). Peak memory consumption was 22.7 MB. Max. memory is 11.5 GB. [2018-10-26 23:12:35,185 INFO L168 Benchmark]: TraceAbstraction took 2513.17 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 927.9 MB in the end (delta: 198.5 MB). Peak memory consumption was 198.5 MB. Max. memory is 11.5 GB. [2018-10-26 23:12:35,185 INFO L168 Benchmark]: Witness Printer took 5.11 ms. Allocated memory is still 1.2 GB. Free memory is still 927.9 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-10-26 23:12:35,190 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.11 ms. Allocated memory is still 1.0 GB. Free memory is still 985.4 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 229.12 ms. Allocated memory is still 1.0 GB. Free memory was 960.7 MB in the beginning and 950.0 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. * Boogie Preprocessor took 37.74 ms. Allocated memory is still 1.0 GB. Free memory was 950.0 MB in the beginning and 947.3 MB in the end (delta: 2.7 MB). Peak memory consumption was 2.7 MB. Max. memory is 11.5 GB. * RCFGBuilder took 529.56 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 148.9 MB). Free memory was 947.3 MB in the beginning and 1.1 GB in the end (delta: -179.1 MB). Peak memory consumption was 22.7 MB. Max. memory is 11.5 GB. * TraceAbstraction took 2513.17 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 927.9 MB in the end (delta: 198.5 MB). Peak memory consumption was 198.5 MB. Max. memory is 11.5 GB. * Witness Printer took 5.11 ms. Allocated memory is still 1.2 GB. Free memory is still 927.9 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] FCALL char string_A[5], string_B[5]; VAL [string_A={8:0}, string_B={9:0}] [L18] int i, j, nc_A, nc_B, found=0; [L21] i=0 VAL [found=0, i=0, string_A={8:0}, string_B={9:0}] [L21] COND TRUE i<5 [L22] FCALL string_A[i]=__VERIFIER_nondet_char() VAL [__VERIFIER_nondet_char()=0, found=0, i=0, string_A={8:0}, string_B={9:0}] [L21] i++ VAL [found=0, i=1, string_A={8:0}, string_B={9:0}] [L21] COND TRUE i<5 [L22] FCALL string_A[i]=__VERIFIER_nondet_char() VAL [__VERIFIER_nondet_char()=0, found=0, i=1, string_A={8:0}, string_B={9:0}] [L21] i++ VAL [found=0, i=2, string_A={8:0}, string_B={9:0}] [L21] COND TRUE i<5 [L22] FCALL string_A[i]=__VERIFIER_nondet_char() VAL [__VERIFIER_nondet_char()=0, found=0, i=2, string_A={8:0}, string_B={9:0}] [L21] i++ VAL [found=0, i=3, string_A={8:0}, string_B={9:0}] [L21] COND TRUE i<5 [L22] FCALL string_A[i]=__VERIFIER_nondet_char() VAL [__VERIFIER_nondet_char()=0, found=0, i=3, string_A={8:0}, string_B={9:0}] [L21] i++ VAL [found=0, i=4, string_A={8:0}, string_B={9:0}] [L21] COND TRUE i<5 [L22] FCALL string_A[i]=__VERIFIER_nondet_char() VAL [__VERIFIER_nondet_char()=0, found=0, i=4, string_A={8:0}, string_B={9:0}] [L21] i++ VAL [found=0, i=5, string_A={8:0}, string_B={9:0}] [L21] COND FALSE !(i<5) VAL [found=0, i=5, string_A={8:0}, string_B={9:0}] [L23] EXPR, FCALL string_A[5 -1] VAL [found=0, i=5, string_A={8:0}, string_A[5 -1]=0, string_B={9:0}] [L23] COND FALSE !(!(string_A[5 -1]=='\0')) [L25] i=0 VAL [found=0, i=0, string_A={8:0}, string_B={9:0}] [L25] COND TRUE i<5 [L26] FCALL string_B[i]=__VERIFIER_nondet_char() VAL [__VERIFIER_nondet_char()=0, found=0, i=0, string_A={8:0}, string_B={9:0}] [L25] i++ VAL [found=0, i=1, string_A={8:0}, string_B={9:0}] [L25] COND TRUE i<5 [L26] FCALL string_B[i]=__VERIFIER_nondet_char() VAL [__VERIFIER_nondet_char()=0, found=0, i=1, string_A={8:0}, string_B={9:0}] [L25] i++ VAL [found=0, i=2, string_A={8:0}, string_B={9:0}] [L25] COND TRUE i<5 [L26] FCALL string_B[i]=__VERIFIER_nondet_char() VAL [__VERIFIER_nondet_char()=0, found=0, i=2, string_A={8:0}, string_B={9:0}] [L25] i++ VAL [found=0, i=3, string_A={8:0}, string_B={9:0}] [L25] COND TRUE i<5 [L26] FCALL string_B[i]=__VERIFIER_nondet_char() VAL [__VERIFIER_nondet_char()=0, found=0, i=3, string_A={8:0}, string_B={9:0}] [L25] i++ VAL [found=0, i=4, string_A={8:0}, string_B={9:0}] [L25] COND TRUE i<5 [L26] FCALL string_B[i]=__VERIFIER_nondet_char() VAL [__VERIFIER_nondet_char()=0, found=0, i=4, string_A={8:0}, string_B={9:0}] [L25] i++ VAL [found=0, i=5, string_A={8:0}, string_B={9:0}] [L25] COND FALSE !(i<5) VAL [found=0, i=5, string_A={8:0}, string_B={9:0}] [L27] EXPR, FCALL string_B[5 -1] VAL [found=0, i=5, string_A={8:0}, string_B={9:0}, 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={8:0}, string_B={9:0}] [L30] EXPR, FCALL string_A[nc_A] VAL [found=0, i=5, nc_A=0, string_A={8:0}, string_A[nc_A]=0, string_B={9:0}] [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={8:0}, string_B={9:0}] [L34] EXPR, FCALL string_B[nc_B] VAL [found=0, i=5, nc_A=0, nc_B=0, string_A={8:0}, string_B={9:0}, 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={8:0}, string_B={9:0}] [L41] COND FALSE !((inc_B-1)< main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/working_dir_2cf71372-7936-41ce-9463-266dd2834c69/bin-2019/uautomizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(__VERIFIER_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 77cd31699320cd40da64f32a92959020d19291bd [2018-10-26 23:12:37,074 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-26 23:12:37,087 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-26 23:12:37,092 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-26 23:12:37,093 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-26 23:12:37,094 INFO L276 PluginConnector]: CDTParser initialized [2018-10-26 23:12:37,095 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/working_dir_2cf71372-7936-41ce-9463-266dd2834c69/bin-2019/uautomizer/../../sv-benchmarks/c/loops/string_false-unreach-call_true-termination.i [2018-10-26 23:12:37,142 INFO L218 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_2cf71372-7936-41ce-9463-266dd2834c69/bin-2019/uautomizer/data/93cd99df8/d046421f228748628e0b8db50ff0503e/FLAGc4e711f38 [2018-10-26 23:12:37,517 INFO L298 CDTParser]: Found 1 translation units. [2018-10-26 23:12:37,518 INFO L158 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/working_dir_2cf71372-7936-41ce-9463-266dd2834c69/sv-benchmarks/c/loops/string_false-unreach-call_true-termination.i [2018-10-26 23:12:37,525 INFO L346 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_2cf71372-7936-41ce-9463-266dd2834c69/bin-2019/uautomizer/data/93cd99df8/d046421f228748628e0b8db50ff0503e/FLAGc4e711f38 [2018-10-26 23:12:37,541 INFO L354 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/working_dir_2cf71372-7936-41ce-9463-266dd2834c69/bin-2019/uautomizer/data/93cd99df8/d046421f228748628e0b8db50ff0503e [2018-10-26 23:12:37,545 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-26 23:12:37,547 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-26 23:12:37,548 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-26 23:12:37,551 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-26 23:12:37,555 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-26 23:12:37,555 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.10 11:12:37" (1/1) ... [2018-10-26 23:12:37,558 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@770feb10 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 11:12:37, skipping insertion in model container [2018-10-26 23:12:37,558 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.10 11:12:37" (1/1) ... [2018-10-26 23:12:37,566 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-26 23:12:37,586 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-26 23:12:37,758 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-26 23:12:37,761 INFO L189 MainTranslator]: Completed pre-run [2018-10-26 23:12:37,782 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-26 23:12:37,799 INFO L193 MainTranslator]: Completed translation [2018-10-26 23:12:37,799 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 11:12:37 WrapperNode [2018-10-26 23:12:37,799 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-26 23:12:37,800 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-26 23:12:37,800 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-26 23:12:37,800 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-26 23:12:37,809 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 11:12:37" (1/1) ... [2018-10-26 23:12:37,809 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 11:12:37" (1/1) ... [2018-10-26 23:12:37,817 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 11:12:37" (1/1) ... [2018-10-26 23:12:37,817 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 11:12:37" (1/1) ... [2018-10-26 23:12:37,824 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 11:12:37" (1/1) ... [2018-10-26 23:12:37,830 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 11:12:37" (1/1) ... [2018-10-26 23:12:37,831 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 11:12:37" (1/1) ... [2018-10-26 23:12:37,833 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-26 23:12:37,834 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-26 23:12:37,834 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-26 23:12:37,834 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-26 23:12:37,835 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 11:12:37" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_2cf71372-7936-41ce-9463-266dd2834c69/bin-2019/uautomizer/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-26 23:12:37,924 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-26 23:12:37,925 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-26 23:12:37,925 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-26 23:12:37,925 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-26 23:12:37,925 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2018-10-26 23:12:37,925 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assume [2018-10-26 23:12:37,925 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-26 23:12:37,925 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2018-10-26 23:12:37,926 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-26 23:12:37,926 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-10-26 23:12:37,926 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE1 [2018-10-26 23:12:37,926 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE1 [2018-10-26 23:12:37,926 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-10-26 23:12:37,926 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-26 23:12:37,926 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-26 23:12:37,926 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~intINTTYPE1 [2018-10-26 23:12:38,387 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-26 23:12:38,387 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.10 11:12:38 BoogieIcfgContainer [2018-10-26 23:12:38,388 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-26 23:12:38,389 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-26 23:12:38,389 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-26 23:12:38,392 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-26 23:12:38,392 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 26.10 11:12:37" (1/3) ... [2018-10-26 23:12:38,392 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@726f68d8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.10 11:12:38, skipping insertion in model container [2018-10-26 23:12:38,393 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 11:12:37" (2/3) ... [2018-10-26 23:12:38,393 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@726f68d8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.10 11:12:38, skipping insertion in model container [2018-10-26 23:12:38,393 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.10 11:12:38" (3/3) ... [2018-10-26 23:12:38,394 INFO L112 eAbstractionObserver]: Analyzing ICFG string_false-unreach-call_true-termination.i [2018-10-26 23:12:38,403 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-26 23:12:38,408 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-26 23:12:38,418 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-26 23:12:38,443 INFO L135 ementStrategyFactory]: Using default assertion order modulation [2018-10-26 23:12:38,444 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-26 23:12:38,444 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-26 23:12:38,444 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-26 23:12:38,444 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-26 23:12:38,444 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-26 23:12:38,445 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-26 23:12:38,445 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-26 23:12:38,445 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-26 23:12:38,460 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states. [2018-10-26 23:12:38,465 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-10-26 23:12:38,466 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 23:12:38,466 INFO L375 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] [2018-10-26 23:12:38,468 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 23:12:38,472 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 23:12:38,472 INFO L82 PathProgramCache]: Analyzing trace with hash 308783607, now seen corresponding path program 1 times [2018-10-26 23:12:38,475 INFO L225 ckRefinementStrategy]: Switched to mode CVC4_FPBP [2018-10-26 23:12:38,475 INFO L69 tionRefinementEngine]: Using refinement strategy WolfRefinementStrategy No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_2cf71372-7936-41ce-9463-266dd2834c69/bin-2019/uautomizer/cvc4nyu Starting monitored process 2 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk [2018-10-26 23:12:38,489 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 23:12:38,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 23:12:38,532 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 23:12:38,548 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-26 23:12:38,548 INFO L312 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [MP cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk (2)] Exception during sending of exit command (exit): Broken pipe [2018-10-26 23:12:38,553 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-26 23:12:38,553 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-26 23:12:38,556 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-26 23:12:38,566 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-26 23:12:38,566 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-26 23:12:38,568 INFO L87 Difference]: Start difference. First operand 64 states. Second operand 2 states. [2018-10-26 23:12:38,585 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 23:12:38,585 INFO L93 Difference]: Finished difference Result 115 states and 142 transitions. [2018-10-26 23:12:38,586 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-26 23:12:38,586 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 24 [2018-10-26 23:12:38,587 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 23:12:38,592 INFO L225 Difference]: With dead ends: 115 [2018-10-26 23:12:38,592 INFO L226 Difference]: Without dead ends: 41 [2018-10-26 23:12:38,595 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-26 23:12:38,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2018-10-26 23:12:38,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2018-10-26 23:12:38,621 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-10-26 23:12:38,621 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 46 transitions. [2018-10-26 23:12:38,623 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 46 transitions. Word has length 24 [2018-10-26 23:12:38,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 23:12:38,623 INFO L481 AbstractCegarLoop]: Abstraction has 41 states and 46 transitions. [2018-10-26 23:12:38,623 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-26 23:12:38,623 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 46 transitions. [2018-10-26 23:12:38,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-10-26 23:12:38,624 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 23:12:38,624 INFO L375 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, 1, 1, 1] [2018-10-26 23:12:38,625 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 23:12:38,625 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 23:12:38,625 INFO L82 PathProgramCache]: Analyzing trace with hash -598303112, now seen corresponding path program 1 times [2018-10-26 23:12:38,625 INFO L225 ckRefinementStrategy]: Switched to mode CVC4_FPBP [2018-10-26 23:12:38,626 INFO L69 tionRefinementEngine]: Using refinement strategy WolfRefinementStrategy No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_2cf71372-7936-41ce-9463-266dd2834c69/bin-2019/uautomizer/cvc4nyu Starting monitored process 3 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk [2018-10-26 23:12:38,639 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 23:12:38,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 23:12:38,686 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 23:12:38,707 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-26 23:12:38,707 INFO L312 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2018-10-26 23:12:38,708 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-26 23:12:38,709 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-26 23:12:38,710 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-26 23:12:38,710 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-26 23:12:38,711 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-26 23:12:38,711 INFO L87 Difference]: Start difference. First operand 41 states and 46 transitions. Second operand 3 states. [2018-10-26 23:12:38,957 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 23:12:38,957 INFO L93 Difference]: Finished difference Result 86 states and 99 transitions. [2018-10-26 23:12:38,958 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-26 23:12:38,958 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 31 [2018-10-26 23:12:38,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 23:12:38,961 INFO L225 Difference]: With dead ends: 86 [2018-10-26 23:12:38,961 INFO L226 Difference]: Without dead ends: 58 [2018-10-26 23:12:38,962 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-26 23:12:38,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2018-10-26 23:12:38,968 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 45. [2018-10-26 23:12:38,969 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-10-26 23:12:38,970 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 50 transitions. [2018-10-26 23:12:38,970 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 50 transitions. Word has length 31 [2018-10-26 23:12:38,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 23:12:38,970 INFO L481 AbstractCegarLoop]: Abstraction has 45 states and 50 transitions. [2018-10-26 23:12:38,970 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-26 23:12:38,970 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 50 transitions. [2018-10-26 23:12:38,972 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-10-26 23:12:38,972 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 23:12:38,972 INFO L375 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 23:12:38,972 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 23:12:38,973 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 23:12:38,973 INFO L82 PathProgramCache]: Analyzing trace with hash 1546214901, now seen corresponding path program 1 times [2018-10-26 23:12:38,973 INFO L225 ckRefinementStrategy]: Switched to mode CVC4_FPBP [2018-10-26 23:12:38,974 INFO L69 tionRefinementEngine]: Using refinement strategy WolfRefinementStrategy No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_2cf71372-7936-41ce-9463-266dd2834c69/bin-2019/uautomizer/cvc4nyu Starting monitored process 4 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk [2018-10-26 23:12:39,001 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 23:12:39,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 23:12:39,053 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 23:12:39,182 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-26 23:12:39,182 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 23:12:39,243 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-26 23:12:39,248 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-26 23:12:39,248 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6 [2018-10-26 23:12:39,249 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-26 23:12:39,249 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-26 23:12:39,249 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-10-26 23:12:39,249 INFO L87 Difference]: Start difference. First operand 45 states and 50 transitions. Second operand 6 states. [2018-10-26 23:12:39,754 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 23:12:39,755 INFO L93 Difference]: Finished difference Result 133 states and 156 transitions. [2018-10-26 23:12:39,759 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-26 23:12:39,760 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 41 [2018-10-26 23:12:39,760 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 23:12:39,761 INFO L225 Difference]: With dead ends: 133 [2018-10-26 23:12:39,761 INFO L226 Difference]: Without dead ends: 103 [2018-10-26 23:12:39,761 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 77 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=19, Invalid=23, Unknown=0, NotChecked=0, Total=42 [2018-10-26 23:12:39,762 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2018-10-26 23:12:39,769 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 75. [2018-10-26 23:12:39,769 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2018-10-26 23:12:39,770 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 80 transitions. [2018-10-26 23:12:39,770 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 80 transitions. Word has length 41 [2018-10-26 23:12:39,771 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 23:12:39,771 INFO L481 AbstractCegarLoop]: Abstraction has 75 states and 80 transitions. [2018-10-26 23:12:39,771 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-26 23:12:39,771 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 80 transitions. [2018-10-26 23:12:39,772 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2018-10-26 23:12:39,772 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 23:12:39,773 INFO L375 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 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, 1, 1, 1, 1, 1] [2018-10-26 23:12:39,774 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 23:12:39,774 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 23:12:39,775 INFO L82 PathProgramCache]: Analyzing trace with hash 1338516920, now seen corresponding path program 2 times [2018-10-26 23:12:39,775 INFO L225 ckRefinementStrategy]: Switched to mode CVC4_FPBP [2018-10-26 23:12:39,775 INFO L69 tionRefinementEngine]: Using refinement strategy WolfRefinementStrategy No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_2cf71372-7936-41ce-9463-266dd2834c69/bin-2019/uautomizer/cvc4nyu Starting monitored process 5 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk [2018-10-26 23:12:39,796 INFO L101 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2018-10-26 23:12:39,838 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2018-10-26 23:12:39,838 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 23:12:39,844 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 23:12:40,015 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 76 trivial. 0 not checked. [2018-10-26 23:12:40,016 INFO L312 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2018-10-26 23:12:40,023 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-26 23:12:40,024 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2018-10-26 23:12:40,025 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-26 23:12:40,025 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-26 23:12:40,025 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2018-10-26 23:12:40,025 INFO L87 Difference]: Start difference. First operand 75 states and 80 transitions. Second operand 7 states. [2018-10-26 23:12:40,238 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 23:12:40,238 INFO L93 Difference]: Finished difference Result 96 states and 104 transitions. [2018-10-26 23:12:40,239 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-26 23:12:40,239 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 71 [2018-10-26 23:12:40,240 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 23:12:40,240 INFO L225 Difference]: With dead ends: 96 [2018-10-26 23:12:40,240 INFO L226 Difference]: Without dead ends: 78 [2018-10-26 23:12:40,241 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2018-10-26 23:12:40,242 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2018-10-26 23:12:40,247 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 78. [2018-10-26 23:12:40,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2018-10-26 23:12:40,248 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 83 transitions. [2018-10-26 23:12:40,248 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 83 transitions. Word has length 71 [2018-10-26 23:12:40,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 23:12:40,249 INFO L481 AbstractCegarLoop]: Abstraction has 78 states and 83 transitions. [2018-10-26 23:12:40,249 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-26 23:12:40,249 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 83 transitions. [2018-10-26 23:12:40,250 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2018-10-26 23:12:40,250 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 23:12:40,251 INFO L375 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 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, 1, 1] [2018-10-26 23:12:40,252 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 23:12:40,252 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 23:12:40,252 INFO L82 PathProgramCache]: Analyzing trace with hash 402234175, now seen corresponding path program 1 times [2018-10-26 23:12:40,253 INFO L225 ckRefinementStrategy]: Switched to mode CVC4_FPBP [2018-10-26 23:12:40,253 INFO L69 tionRefinementEngine]: Using refinement strategy WolfRefinementStrategy No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_2cf71372-7936-41ce-9463-266dd2834c69/bin-2019/uautomizer/cvc4nyu Starting monitored process 6 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk [2018-10-26 23:12:40,267 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 23:12:40,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 23:12:40,319 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 23:12:40,361 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2018-10-26 23:12:40,362 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 23:12:40,497 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2018-10-26 23:12:40,499 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-26 23:12:40,499 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2018-10-26 23:12:40,499 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-26 23:12:40,500 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-26 23:12:40,500 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2018-10-26 23:12:40,500 INFO L87 Difference]: Start difference. First operand 78 states and 83 transitions. Second operand 12 states. [2018-10-26 23:12:41,286 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 23:12:41,287 INFO L93 Difference]: Finished difference Result 177 states and 198 transitions. [2018-10-26 23:12:41,287 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-26 23:12:41,287 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 74 [2018-10-26 23:12:41,288 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 23:12:41,288 INFO L225 Difference]: With dead ends: 177 [2018-10-26 23:12:41,288 INFO L226 Difference]: Without dead ends: 129 [2018-10-26 23:12:41,289 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 137 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2018-10-26 23:12:41,289 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2018-10-26 23:12:41,297 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 88. [2018-10-26 23:12:41,297 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2018-10-26 23:12:41,298 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 93 transitions. [2018-10-26 23:12:41,298 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 93 transitions. Word has length 74 [2018-10-26 23:12:41,299 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 23:12:41,299 INFO L481 AbstractCegarLoop]: Abstraction has 88 states and 93 transitions. [2018-10-26 23:12:41,300 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-26 23:12:41,300 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 93 transitions. [2018-10-26 23:12:41,303 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2018-10-26 23:12:41,303 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 23:12:41,303 INFO L375 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 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, 1, 1] [2018-10-26 23:12:41,303 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 23:12:41,303 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 23:12:41,304 INFO L82 PathProgramCache]: Analyzing trace with hash 1895604002, now seen corresponding path program 2 times [2018-10-26 23:12:41,304 INFO L225 ckRefinementStrategy]: Switched to mode CVC4_FPBP [2018-10-26 23:12:41,304 INFO L69 tionRefinementEngine]: Using refinement strategy WolfRefinementStrategy No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_2cf71372-7936-41ce-9463-266dd2834c69/bin-2019/uautomizer/cvc4nyu Starting monitored process 7 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk [2018-10-26 23:12:41,331 INFO L101 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2018-10-26 23:12:41,369 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2018-10-26 23:12:41,369 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 23:12:41,373 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 23:12:41,431 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 123 trivial. 0 not checked. [2018-10-26 23:12:41,431 INFO L312 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2018-10-26 23:12:41,435 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-26 23:12:41,435 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2018-10-26 23:12:41,436 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-26 23:12:41,436 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-26 23:12:41,436 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-10-26 23:12:41,437 INFO L87 Difference]: Start difference. First operand 88 states and 93 transitions. Second operand 6 states. [2018-10-26 23:12:41,562 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 23:12:41,562 INFO L93 Difference]: Finished difference Result 99 states and 105 transitions. [2018-10-26 23:12:41,563 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-26 23:12:41,563 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 84 [2018-10-26 23:12:41,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 23:12:41,564 INFO L225 Difference]: With dead ends: 99 [2018-10-26 23:12:41,564 INFO L226 Difference]: Without dead ends: 93 [2018-10-26 23:12:41,564 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 79 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2018-10-26 23:12:41,564 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2018-10-26 23:12:41,569 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 90. [2018-10-26 23:12:41,570 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2018-10-26 23:12:41,570 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 95 transitions. [2018-10-26 23:12:41,571 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 95 transitions. Word has length 84 [2018-10-26 23:12:41,572 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 23:12:41,572 INFO L481 AbstractCegarLoop]: Abstraction has 90 states and 95 transitions. [2018-10-26 23:12:41,572 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-26 23:12:41,573 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 95 transitions. [2018-10-26 23:12:41,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2018-10-26 23:12:41,574 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 23:12:41,574 INFO L375 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 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, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 23:12:41,574 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 23:12:41,574 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 23:12:41,574 INFO L82 PathProgramCache]: Analyzing trace with hash -1423095970, now seen corresponding path program 1 times [2018-10-26 23:12:41,575 INFO L225 ckRefinementStrategy]: Switched to mode CVC4_FPBP [2018-10-26 23:12:41,575 INFO L69 tionRefinementEngine]: Using refinement strategy WolfRefinementStrategy No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_2cf71372-7936-41ce-9463-266dd2834c69/bin-2019/uautomizer/cvc4nyu Starting monitored process 8 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk [2018-10-26 23:12:41,588 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 23:12:41,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 23:12:41,654 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 23:12:41,680 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 123 trivial. 0 not checked. [2018-10-26 23:12:41,681 INFO L312 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2018-10-26 23:12:41,683 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-26 23:12:41,684 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2018-10-26 23:12:41,684 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-26 23:12:41,684 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-26 23:12:41,684 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2018-10-26 23:12:41,684 INFO L87 Difference]: Start difference. First operand 90 states and 95 transitions. Second operand 4 states. [2018-10-26 23:12:41,713 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 23:12:41,714 INFO L93 Difference]: Finished difference Result 114 states and 122 transitions. [2018-10-26 23:12:41,714 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-26 23:12:41,714 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 89 [2018-10-26 23:12:41,715 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 23:12:41,715 INFO L225 Difference]: With dead ends: 114 [2018-10-26 23:12:41,715 INFO L226 Difference]: Without dead ends: 93 [2018-10-26 23:12:41,716 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 86 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2018-10-26 23:12:41,716 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2018-10-26 23:12:41,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 93. [2018-10-26 23:12:41,724 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2018-10-26 23:12:41,724 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 98 transitions. [2018-10-26 23:12:41,725 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 98 transitions. Word has length 89 [2018-10-26 23:12:41,725 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 23:12:41,725 INFO L481 AbstractCegarLoop]: Abstraction has 93 states and 98 transitions. [2018-10-26 23:12:41,725 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-26 23:12:41,725 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 98 transitions. [2018-10-26 23:12:41,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2018-10-26 23:12:41,726 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 23:12:41,727 INFO L375 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 2, 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, 1, 1, 1, 1, 1, 1] [2018-10-26 23:12:41,728 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 23:12:41,728 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 23:12:41,728 INFO L82 PathProgramCache]: Analyzing trace with hash 174267018, now seen corresponding path program 1 times [2018-10-26 23:12:41,729 INFO L225 ckRefinementStrategy]: Switched to mode CVC4_FPBP [2018-10-26 23:12:41,729 INFO L69 tionRefinementEngine]: Using refinement strategy WolfRefinementStrategy No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_2cf71372-7936-41ce-9463-266dd2834c69/bin-2019/uautomizer/cvc4nyu Starting monitored process 9 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk [2018-10-26 23:12:41,744 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 23:12:41,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-10-26 23:12:42,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-10-26 23:12:42,179 INFO L442 BasicCegarLoop]: Counterexample might be feasible [2018-10-26 23:12:42,226 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 26.10 11:12:42 BoogieIcfgContainer [2018-10-26 23:12:42,227 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-26 23:12:42,227 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2018-10-26 23:12:42,227 INFO L271 PluginConnector]: Initializing Witness Printer... [2018-10-26 23:12:42,228 INFO L276 PluginConnector]: Witness Printer initialized [2018-10-26 23:12:42,228 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.10 11:12:38" (3/4) ... [2018-10-26 23:12:42,230 INFO L138 WitnessPrinter]: Generating witness for reachability counterexample [2018-10-26 23:12:42,324 INFO L145 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/working_dir_2cf71372-7936-41ce-9463-266dd2834c69/bin-2019/uautomizer/witness.graphml [2018-10-26 23:12:42,324 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2018-10-26 23:12:42,325 INFO L168 Benchmark]: Toolchain (without parser) took 4778.47 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 216.5 MB). Free memory was 953.2 MB in the beginning and 1.2 GB in the end (delta: -256.4 MB). Peak memory consumption was 282.8 MB. Max. memory is 11.5 GB. [2018-10-26 23:12:42,326 INFO L168 Benchmark]: CDTParser took 0.17 ms. Allocated memory is still 1.0 GB. Free memory is still 978.7 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-10-26 23:12:42,326 INFO L168 Benchmark]: CACSL2BoogieTranslator took 251.13 ms. Allocated memory is still 1.0 GB. Free memory was 953.2 MB in the beginning and 937.1 MB in the end (delta: 16.1 MB). Peak memory consumption was 16.1 MB. Max. memory is 11.5 GB. [2018-10-26 23:12:42,327 INFO L168 Benchmark]: Boogie Preprocessor took 33.52 ms. Allocated memory is still 1.0 GB. Free memory is still 937.1 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-10-26 23:12:42,327 INFO L168 Benchmark]: RCFGBuilder took 554.03 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 163.1 MB). Free memory was 937.1 MB in the beginning and 1.1 GB in the end (delta: -193.7 MB). Peak memory consumption was 21.9 MB. Max. memory is 11.5 GB. [2018-10-26 23:12:42,327 INFO L168 Benchmark]: TraceAbstraction took 3837.81 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 842.1 MB in the end (delta: 288.7 MB). Peak memory consumption was 288.7 MB. Max. memory is 11.5 GB. [2018-10-26 23:12:42,327 INFO L168 Benchmark]: Witness Printer took 97.21 ms. Allocated memory was 1.2 GB in the beginning and 1.2 GB in the end (delta: 53.5 MB). Free memory was 842.1 MB in the beginning and 1.2 GB in the end (delta: -367.5 MB). Peak memory consumption was 8.6 MB. Max. memory is 11.5 GB. [2018-10-26 23:12:42,329 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.17 ms. Allocated memory is still 1.0 GB. Free memory is still 978.7 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 251.13 ms. Allocated memory is still 1.0 GB. Free memory was 953.2 MB in the beginning and 937.1 MB in the end (delta: 16.1 MB). Peak memory consumption was 16.1 MB. Max. memory is 11.5 GB. * Boogie Preprocessor took 33.52 ms. Allocated memory is still 1.0 GB. Free memory is still 937.1 MB. There was no memory consumed. Max. memory is 11.5 GB. * RCFGBuilder took 554.03 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 163.1 MB). Free memory was 937.1 MB in the beginning and 1.1 GB in the end (delta: -193.7 MB). Peak memory consumption was 21.9 MB. Max. memory is 11.5 GB. * TraceAbstraction took 3837.81 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 842.1 MB in the end (delta: 288.7 MB). Peak memory consumption was 288.7 MB. Max. memory is 11.5 GB. * Witness Printer took 97.21 ms. Allocated memory was 1.2 GB in the beginning and 1.2 GB in the end (delta: 53.5 MB). Free memory was 842.1 MB in the beginning and 1.2 GB in the end (delta: -367.5 MB). Peak memory consumption was 8.6 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] FCALL char string_A[5], string_B[5]; VAL [string_A={2:0}, string_B={3:0}] [L18] int i, j, nc_A, nc_B, found=0; [L21] i=0 VAL [found=0, i=0, string_A={2:0}, string_B={3:0}] [L21] COND TRUE i<5 VAL [found=0, i=0, string_A={2:0}, string_B={3:0}] [L22] FCALL string_A[i]=__VERIFIER_nondet_char() VAL [__VERIFIER_nondet_char()=1, found=0, i=0, string_A={2:0}, string_B={3:0}] [L21] i++ VAL [found=0, i=1, string_A={2:0}, string_B={3:0}] [L21] COND TRUE i<5 VAL [found=0, i=1, string_A={2:0}, string_B={3:0}] [L22] FCALL string_A[i]=__VERIFIER_nondet_char() VAL [__VERIFIER_nondet_char()=0, found=0, i=1, string_A={2:0}, string_B={3:0}] [L21] i++ VAL [found=0, i=2, string_A={2:0}, string_B={3:0}] [L21] COND TRUE i<5 VAL [found=0, i=2, string_A={2:0}, string_B={3:0}] [L22] FCALL string_A[i]=__VERIFIER_nondet_char() VAL [__VERIFIER_nondet_char()=0, found=0, i=2, string_A={2:0}, string_B={3:0}] [L21] i++ VAL [found=0, i=3, string_A={2:0}, string_B={3:0}] [L21] COND TRUE i<5 VAL [found=0, i=3, string_A={2:0}, string_B={3:0}] [L22] FCALL string_A[i]=__VERIFIER_nondet_char() VAL [__VERIFIER_nondet_char()=0, found=0, i=3, string_A={2:0}, string_B={3:0}] [L21] i++ VAL [found=0, i=4, string_A={2:0}, string_B={3:0}] [L21] COND TRUE i<5 VAL [found=0, i=4, string_A={2:0}, string_B={3:0}] [L22] FCALL string_A[i]=__VERIFIER_nondet_char() VAL [__VERIFIER_nondet_char()=0, found=0, i=4, string_A={2:0}, string_B={3:0}] [L21] i++ VAL [found=0, i=5, string_A={2:0}, string_B={3:0}] [L21] COND FALSE !(i<5) VAL [found=0, i=5, string_A={2:0}, string_B={3:0}] [L23] EXPR, FCALL string_A[5 -1] VAL [found=0, i=5, string_A={2:0}, string_A[5 -1]=0, string_B={3:0}] [L23] COND FALSE !(!(string_A[5 -1]=='\0')) [L25] i=0 VAL [found=0, i=0, string_A={2:0}, string_B={3:0}] [L25] COND TRUE i<5 VAL [found=0, i=0, string_A={2:0}, string_B={3:0}] [L26] FCALL string_B[i]=__VERIFIER_nondet_char() VAL [__VERIFIER_nondet_char()=1, found=0, i=0, string_A={2:0}, string_B={3:0}] [L25] i++ VAL [found=0, i=1, string_A={2:0}, string_B={3:0}] [L25] COND TRUE i<5 VAL [found=0, i=1, string_A={2:0}, string_B={3:0}] [L26] FCALL string_B[i]=__VERIFIER_nondet_char() VAL [__VERIFIER_nondet_char()=0, found=0, i=1, string_A={2:0}, string_B={3:0}] [L25] i++ VAL [found=0, i=2, string_A={2:0}, string_B={3:0}] [L25] COND TRUE i<5 VAL [found=0, i=2, string_A={2:0}, string_B={3:0}] [L26] FCALL string_B[i]=__VERIFIER_nondet_char() VAL [__VERIFIER_nondet_char()=0, found=0, i=2, string_A={2:0}, string_B={3:0}] [L25] i++ VAL [found=0, i=3, string_A={2:0}, string_B={3:0}] [L25] COND TRUE i<5 VAL [found=0, i=3, string_A={2:0}, string_B={3:0}] [L26] FCALL string_B[i]=__VERIFIER_nondet_char() VAL [__VERIFIER_nondet_char()=0, found=0, i=3, string_A={2:0}, string_B={3:0}] [L25] i++ VAL [found=0, i=4, string_A={2:0}, string_B={3:0}] [L25] COND TRUE i<5 VAL [found=0, i=4, string_A={2:0}, string_B={3:0}] [L26] FCALL string_B[i]=__VERIFIER_nondet_char() VAL [__VERIFIER_nondet_char()=0, found=0, i=4, string_A={2:0}, string_B={3:0}] [L25] i++ VAL [found=0, i=5, string_A={2:0}, string_B={3:0}] [L25] COND FALSE !(i<5) VAL [found=0, i=5, string_A={2:0}, string_B={3:0}] [L27] EXPR, FCALL string_B[5 -1] VAL [found=0, i=5, string_A={2:0}, string_B={3:0}, 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={2:0}, string_B={3:0}] [L30] EXPR, FCALL string_A[nc_A] VAL [found=0, i=5, nc_A=0, string_A={2:0}, string_A[nc_A]=1, string_B={3:0}] [L30] COND TRUE string_A[nc_A]!='\0' [L31] nc_A++ VAL [found=0, i=5, nc_A=1, string_A={2:0}, string_B={3:0}] [L30] EXPR, FCALL string_A[nc_A] VAL [found=0, i=5, nc_A=1, string_A={2:0}, string_A[nc_A]=0, string_B={3:0}] [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={2:0}, string_B={3:0}] [L34] EXPR, FCALL string_B[nc_B] VAL [found=0, i=5, nc_A=1, nc_B=0, string_A={2:0}, string_B={3:0}, 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={2:0}, string_B={3:0}] [L34] EXPR, FCALL string_B[nc_B] VAL [found=0, i=5, nc_A=1, nc_B=1, string_A={2:0}, string_B={3:0}, 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={2:0}, string_B={3:0}] [L41] COND TRUE (inc_B-1)<