./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.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 635dfa2a Calling Ultimate with: java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/working_dir_dbb4eb83-8643-4acf-8e48-43ac9ddbbbf9/bin-2019/uautomizer/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/working_dir_dbb4eb83-8643-4acf-8e48-43ac9ddbbbf9/bin-2019/uautomizer/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/working_dir_dbb4eb83-8643-4acf-8e48-43ac9ddbbbf9/bin-2019/uautomizer/data -tc /tmp/vcloud-vcloud-master/worker/working_dir_dbb4eb83-8643-4acf-8e48-43ac9ddbbbf9/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_dbb4eb83-8643-4acf-8e48-43ac9ddbbbf9/bin-2019/uautomizer/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/working_dir_dbb4eb83-8643-4acf-8e48-43ac9ddbbbf9/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_dbb4eb83-8643-4acf-8e48-43ac9ddbbbf9/bin-2019/uautomizer/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/working_dir_dbb4eb83-8643-4acf-8e48-43ac9ddbbbf9/bin-2019/uautomizer/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/working_dir_dbb4eb83-8643-4acf-8e48-43ac9ddbbbf9/bin-2019/uautomizer/data -tc /tmp/vcloud-vcloud-master/worker/working_dir_dbb4eb83-8643-4acf-8e48-43ac9ddbbbf9/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_dbb4eb83-8643-4acf-8e48-43ac9ddbbbf9/bin-2019/uautomizer/config/svcomp-Reach-32bit-Automizer_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/working_dir_dbb4eb83-8643-4acf-8e48-43ac9ddbbbf9/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 0.1.23-635dfa2 [2018-12-08 16:13:26,039 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-12-08 16:13:26,041 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-12-08 16:13:26,047 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-12-08 16:13:26,047 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-12-08 16:13:26,048 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-12-08 16:13:26,049 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-12-08 16:13:26,050 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-12-08 16:13:26,051 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-12-08 16:13:26,051 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-12-08 16:13:26,052 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-12-08 16:13:26,052 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-12-08 16:13:26,053 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-12-08 16:13:26,053 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-12-08 16:13:26,054 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-12-08 16:13:26,054 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-12-08 16:13:26,055 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-12-08 16:13:26,056 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-12-08 16:13:26,057 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-12-08 16:13:26,058 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-12-08 16:13:26,058 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-12-08 16:13:26,059 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-12-08 16:13:26,061 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-12-08 16:13:26,061 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-12-08 16:13:26,061 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-12-08 16:13:26,062 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-12-08 16:13:26,062 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-12-08 16:13:26,062 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-12-08 16:13:26,063 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-12-08 16:13:26,063 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-12-08 16:13:26,063 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-12-08 16:13:26,064 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-12-08 16:13:26,064 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-12-08 16:13:26,064 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-12-08 16:13:26,064 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-12-08 16:13:26,065 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-12-08 16:13:26,065 INFO L98 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/working_dir_dbb4eb83-8643-4acf-8e48-43ac9ddbbbf9/bin-2019/uautomizer/config/svcomp-Reach-32bit-Automizer_Default.epf [2018-12-08 16:13:26,071 INFO L110 SettingsManager]: Loading preferences was successful [2018-12-08 16:13:26,072 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-12-08 16:13:26,072 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-12-08 16:13:26,072 INFO L133 SettingsManager]: * ... calls to implemented procedures=ONLY_FOR_CONCURRENT_PROGRAMS [2018-12-08 16:13:26,072 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-12-08 16:13:26,073 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-12-08 16:13:26,073 INFO L133 SettingsManager]: * Use SBE=true [2018-12-08 16:13:26,073 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-12-08 16:13:26,073 INFO L133 SettingsManager]: * sizeof long=4 [2018-12-08 16:13:26,073 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-12-08 16:13:26,073 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-12-08 16:13:26,073 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-12-08 16:13:26,073 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-12-08 16:13:26,073 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-12-08 16:13:26,073 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-12-08 16:13:26,073 INFO L133 SettingsManager]: * sizeof long double=12 [2018-12-08 16:13:26,074 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-12-08 16:13:26,074 INFO L133 SettingsManager]: * Use constant arrays=true [2018-12-08 16:13:26,074 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-12-08 16:13:26,074 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-12-08 16:13:26,074 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-12-08 16:13:26,074 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-12-08 16:13:26,074 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-12-08 16:13:26,074 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-12-08 16:13:26,074 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-12-08 16:13:26,074 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-12-08 16:13:26,075 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-12-08 16:13:26,075 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-12-08 16:13:26,075 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-12-08 16:13:26,075 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-12-08 16:13:26,075 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_dbb4eb83-8643-4acf-8e48-43ac9ddbbbf9/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 [2018-12-08 16:13:26,098 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-12-08 16:13:26,107 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-12-08 16:13:26,109 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-12-08 16:13:26,110 INFO L271 PluginConnector]: Initializing CDTParser... [2018-12-08 16:13:26,111 INFO L276 PluginConnector]: CDTParser initialized [2018-12-08 16:13:26,111 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/working_dir_dbb4eb83-8643-4acf-8e48-43ac9ddbbbf9/bin-2019/uautomizer/../../sv-benchmarks/c/loops/string_false-unreach-call_true-termination.i [2018-12-08 16:13:26,150 INFO L221 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_dbb4eb83-8643-4acf-8e48-43ac9ddbbbf9/bin-2019/uautomizer/data/6cbd617fb/4a7915d34ee549ada69b513fa63b420c/FLAG6a2b5e63f [2018-12-08 16:13:26,565 INFO L307 CDTParser]: Found 1 translation units. [2018-12-08 16:13:26,565 INFO L161 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/working_dir_dbb4eb83-8643-4acf-8e48-43ac9ddbbbf9/sv-benchmarks/c/loops/string_false-unreach-call_true-termination.i [2018-12-08 16:13:26,569 INFO L355 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_dbb4eb83-8643-4acf-8e48-43ac9ddbbbf9/bin-2019/uautomizer/data/6cbd617fb/4a7915d34ee549ada69b513fa63b420c/FLAG6a2b5e63f [2018-12-08 16:13:26,577 INFO L363 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/working_dir_dbb4eb83-8643-4acf-8e48-43ac9ddbbbf9/bin-2019/uautomizer/data/6cbd617fb/4a7915d34ee549ada69b513fa63b420c [2018-12-08 16:13:26,579 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-12-08 16:13:26,579 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2018-12-08 16:13:26,580 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-12-08 16:13:26,580 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-12-08 16:13:26,582 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-12-08 16:13:26,583 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 08.12 04:13:26" (1/1) ... [2018-12-08 16:13:26,584 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5d10e54c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.12 04:13:26, skipping insertion in model container [2018-12-08 16:13:26,585 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 08.12 04:13:26" (1/1) ... [2018-12-08 16:13:26,589 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-12-08 16:13:26,599 INFO L176 MainTranslator]: Built tables and reachable declarations [2018-12-08 16:13:26,698 INFO L203 PostProcessor]: Analyzing one entry point: main [2018-12-08 16:13:26,700 INFO L191 MainTranslator]: Completed pre-run [2018-12-08 16:13:26,714 INFO L203 PostProcessor]: Analyzing one entry point: main [2018-12-08 16:13:26,724 INFO L195 MainTranslator]: Completed translation [2018-12-08 16:13:26,724 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.12 04:13:26 WrapperNode [2018-12-08 16:13:26,725 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-12-08 16:13:26,725 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-12-08 16:13:26,725 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-12-08 16:13:26,725 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-12-08 16:13:26,730 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.12 04:13:26" (1/1) ... [2018-12-08 16:13:26,735 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.12 04:13:26" (1/1) ... [2018-12-08 16:13:26,767 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-12-08 16:13:26,767 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-12-08 16:13:26,768 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-12-08 16:13:26,768 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-12-08 16:13:26,774 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.12 04:13:26" (1/1) ... [2018-12-08 16:13:26,774 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.12 04:13:26" (1/1) ... [2018-12-08 16:13:26,775 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.12 04:13:26" (1/1) ... [2018-12-08 16:13:26,775 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.12 04:13:26" (1/1) ... [2018-12-08 16:13:26,780 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.12 04:13:26" (1/1) ... [2018-12-08 16:13:26,784 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.12 04:13:26" (1/1) ... [2018-12-08 16:13:26,785 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.12 04:13:26" (1/1) ... [2018-12-08 16:13:26,786 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-12-08 16:13:26,786 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-12-08 16:13:26,786 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-12-08 16:13:26,786 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-12-08 16:13:26,787 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.12 04:13:26" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_dbb4eb83-8643-4acf-8e48-43ac9ddbbbf9/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 [2018-12-08 16:13:26,817 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2018-12-08 16:13:26,817 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-12-08 16:13:26,817 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-12-08 16:13:26,817 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-12-08 16:13:26,818 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-12-08 16:13:26,818 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-12-08 16:13:26,818 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2018-12-08 16:13:26,818 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-12-08 16:13:26,818 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-12-08 16:13:26,818 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-12-08 16:13:26,818 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-12-08 16:13:26,818 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-12-08 16:13:26,955 INFO L275 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-12-08 16:13:26,955 INFO L280 CfgBuilder]: Removed 5 assue(true) statements. [2018-12-08 16:13:26,955 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 08.12 04:13:26 BoogieIcfgContainer [2018-12-08 16:13:26,955 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-12-08 16:13:26,956 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-12-08 16:13:26,956 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-12-08 16:13:26,958 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-12-08 16:13:26,958 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 08.12 04:13:26" (1/3) ... [2018-12-08 16:13:26,959 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@317c9bef and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 08.12 04:13:26, skipping insertion in model container [2018-12-08 16:13:26,959 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.12 04:13:26" (2/3) ... [2018-12-08 16:13:26,959 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@317c9bef and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 08.12 04:13:26, skipping insertion in model container [2018-12-08 16:13:26,959 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 08.12 04:13:26" (3/3) ... [2018-12-08 16:13:26,960 INFO L112 eAbstractionObserver]: Analyzing ICFG string_false-unreach-call_true-termination.i [2018-12-08 16:13:26,967 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-12-08 16:13:26,971 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-12-08 16:13:26,981 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-12-08 16:13:26,999 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-12-08 16:13:26,999 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-12-08 16:13:26,999 INFO L383 AbstractCegarLoop]: Hoare is true [2018-12-08 16:13:26,999 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-12-08 16:13:27,000 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-12-08 16:13:27,000 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-12-08 16:13:27,000 INFO L387 AbstractCegarLoop]: Difference is false [2018-12-08 16:13:27,000 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-12-08 16:13:27,000 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-12-08 16:13:27,012 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states. [2018-12-08 16:13:27,015 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-12-08 16:13:27,015 INFO L394 BasicCegarLoop]: Found error trace [2018-12-08 16:13:27,016 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-08 16:13:27,017 INFO L423 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-08 16:13:27,021 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-08 16:13:27,021 INFO L82 PathProgramCache]: Analyzing trace with hash -99599224, now seen corresponding path program 1 times [2018-12-08 16:13:27,022 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-12-08 16:13:27,023 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-12-08 16:13:27,051 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 16:13:27,051 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-08 16:13:27,051 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 16:13:27,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-08 16:13:27,097 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-08 16:13:27,099 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-08 16:13:27,099 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-12-08 16:13:27,101 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-12-08 16:13:27,109 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-12-08 16:13:27,109 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-12-08 16:13:27,111 INFO L87 Difference]: Start difference. First operand 35 states. Second operand 2 states. [2018-12-08 16:13:27,124 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-08 16:13:27,124 INFO L93 Difference]: Finished difference Result 62 states and 89 transitions. [2018-12-08 16:13:27,124 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-12-08 16:13:27,125 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 22 [2018-12-08 16:13:27,125 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-08 16:13:27,129 INFO L225 Difference]: With dead ends: 62 [2018-12-08 16:13:27,129 INFO L226 Difference]: Without dead ends: 28 [2018-12-08 16:13:27,131 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-12-08 16:13:27,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-12-08 16:13:27,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2018-12-08 16:13:27,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2018-12-08 16:13:27,151 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 33 transitions. [2018-12-08 16:13:27,152 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 33 transitions. Word has length 22 [2018-12-08 16:13:27,152 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-08 16:13:27,152 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 33 transitions. [2018-12-08 16:13:27,152 INFO L481 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-12-08 16:13:27,152 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 33 transitions. [2018-12-08 16:13:27,153 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-12-08 16:13:27,153 INFO L394 BasicCegarLoop]: Found error trace [2018-12-08 16:13:27,153 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-08 16:13:27,153 INFO L423 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-08 16:13:27,153 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-08 16:13:27,154 INFO L82 PathProgramCache]: Analyzing trace with hash 930552028, now seen corresponding path program 1 times [2018-12-08 16:13:27,154 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-12-08 16:13:27,154 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-12-08 16:13:27,154 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 16:13:27,155 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-08 16:13:27,155 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 16:13:27,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-08 16:13:27,183 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-08 16:13:27,183 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-08 16:13:27,183 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-12-08 16:13:27,184 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-12-08 16:13:27,184 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-12-08 16:13:27,184 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-12-08 16:13:27,184 INFO L87 Difference]: Start difference. First operand 28 states and 33 transitions. Second operand 3 states. [2018-12-08 16:13:27,219 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-08 16:13:27,219 INFO L93 Difference]: Finished difference Result 56 states and 69 transitions. [2018-12-08 16:13:27,220 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-12-08 16:13:27,220 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2018-12-08 16:13:27,220 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-08 16:13:27,222 INFO L225 Difference]: With dead ends: 56 [2018-12-08 16:13:27,223 INFO L226 Difference]: Without dead ends: 36 [2018-12-08 16:13:27,223 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-12-08 16:13:27,224 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-12-08 16:13:27,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 30. [2018-12-08 16:13:27,228 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-12-08 16:13:27,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 35 transitions. [2018-12-08 16:13:27,229 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 35 transitions. Word has length 24 [2018-12-08 16:13:27,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-08 16:13:27,229 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 35 transitions. [2018-12-08 16:13:27,229 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-12-08 16:13:27,229 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 35 transitions. [2018-12-08 16:13:27,229 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-12-08 16:13:27,229 INFO L394 BasicCegarLoop]: Found error trace [2018-12-08 16:13:27,229 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-08 16:13:27,230 INFO L423 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-08 16:13:27,230 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-08 16:13:27,230 INFO L82 PathProgramCache]: Analyzing trace with hash 1358146588, now seen corresponding path program 1 times [2018-12-08 16:13:27,230 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-12-08 16:13:27,230 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-12-08 16:13:27,231 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 16:13:27,231 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-08 16:13:27,231 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 16:13:27,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-08 16:13:27,269 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-12-08 16:13:27,270 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-08 16:13:27,270 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_dbb4eb83-8643-4acf-8e48-43ac9ddbbbf9/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 [2018-12-08 16:13:27,276 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-08 16:13:27,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-08 16:13:27,300 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-08 16:13:27,320 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-12-08 16:13:27,338 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-12-08 16:13:27,338 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2018-12-08 16:13:27,338 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-12-08 16:13:27,338 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-12-08 16:13:27,338 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2018-12-08 16:13:27,338 INFO L87 Difference]: Start difference. First operand 30 states and 35 transitions. Second operand 5 states. [2018-12-08 16:13:27,373 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-08 16:13:27,373 INFO L93 Difference]: Finished difference Result 65 states and 80 transitions. [2018-12-08 16:13:27,373 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-12-08 16:13:27,373 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 28 [2018-12-08 16:13:27,373 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-08 16:13:27,374 INFO L225 Difference]: With dead ends: 65 [2018-12-08 16:13:27,374 INFO L226 Difference]: Without dead ends: 44 [2018-12-08 16:13:27,374 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2018-12-08 16:13:27,374 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2018-12-08 16:13:27,376 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 34. [2018-12-08 16:13:27,377 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2018-12-08 16:13:27,377 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 39 transitions. [2018-12-08 16:13:27,377 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 39 transitions. Word has length 28 [2018-12-08 16:13:27,377 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-08 16:13:27,377 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 39 transitions. [2018-12-08 16:13:27,377 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-12-08 16:13:27,377 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 39 transitions. [2018-12-08 16:13:27,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-12-08 16:13:27,378 INFO L394 BasicCegarLoop]: Found error trace [2018-12-08 16:13:27,378 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-08 16:13:27,378 INFO L423 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-08 16:13:27,378 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-08 16:13:27,378 INFO L82 PathProgramCache]: Analyzing trace with hash -1752396196, now seen corresponding path program 2 times [2018-12-08 16:13:27,378 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-12-08 16:13:27,378 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-12-08 16:13:27,379 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 16:13:27,379 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-08 16:13:27,379 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 16:13:27,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-08 16:13:27,427 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-12-08 16:13:27,427 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-08 16:13:27,427 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_dbb4eb83-8643-4acf-8e48-43ac9ddbbbf9/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 [2018-12-08 16:13:27,433 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-12-08 16:13:27,448 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-12-08 16:13:27,448 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-08 16:13:27,450 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-08 16:13:27,460 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-12-08 16:13:27,474 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-12-08 16:13:27,475 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2018-12-08 16:13:27,475 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-12-08 16:13:27,475 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-12-08 16:13:27,475 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2018-12-08 16:13:27,475 INFO L87 Difference]: Start difference. First operand 34 states and 39 transitions. Second operand 6 states. [2018-12-08 16:13:27,517 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-08 16:13:27,517 INFO L93 Difference]: Finished difference Result 75 states and 92 transitions. [2018-12-08 16:13:27,517 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-12-08 16:13:27,517 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 32 [2018-12-08 16:13:27,517 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-08 16:13:27,518 INFO L225 Difference]: With dead ends: 75 [2018-12-08 16:13:27,518 INFO L226 Difference]: Without dead ends: 52 [2018-12-08 16:13:27,518 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2018-12-08 16:13:27,518 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2018-12-08 16:13:27,521 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 38. [2018-12-08 16:13:27,521 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-12-08 16:13:27,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 43 transitions. [2018-12-08 16:13:27,521 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 43 transitions. Word has length 32 [2018-12-08 16:13:27,521 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-08 16:13:27,521 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 43 transitions. [2018-12-08 16:13:27,522 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-12-08 16:13:27,522 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 43 transitions. [2018-12-08 16:13:27,522 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-12-08 16:13:27,522 INFO L394 BasicCegarLoop]: Found error trace [2018-12-08 16:13:27,522 INFO L402 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-08 16:13:27,522 INFO L423 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-08 16:13:27,522 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-08 16:13:27,522 INFO L82 PathProgramCache]: Analyzing trace with hash -800948324, now seen corresponding path program 3 times [2018-12-08 16:13:27,522 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-12-08 16:13:27,523 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-12-08 16:13:27,523 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 16:13:27,523 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-08 16:13:27,523 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 16:13:27,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-08 16:13:27,563 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-12-08 16:13:27,563 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-08 16:13:27,563 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_dbb4eb83-8643-4acf-8e48-43ac9ddbbbf9/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 [2018-12-08 16:13:27,569 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-08 16:13:27,582 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-12-08 16:13:27,582 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-08 16:13:27,583 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-08 16:13:27,590 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-12-08 16:13:27,604 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-12-08 16:13:27,604 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2018-12-08 16:13:27,604 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-12-08 16:13:27,604 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-12-08 16:13:27,604 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-12-08 16:13:27,605 INFO L87 Difference]: Start difference. First operand 38 states and 43 transitions. Second operand 7 states. [2018-12-08 16:13:27,651 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-08 16:13:27,651 INFO L93 Difference]: Finished difference Result 85 states and 104 transitions. [2018-12-08 16:13:27,651 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-12-08 16:13:27,651 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 36 [2018-12-08 16:13:27,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-08 16:13:27,652 INFO L225 Difference]: With dead ends: 85 [2018-12-08 16:13:27,652 INFO L226 Difference]: Without dead ends: 60 [2018-12-08 16:13:27,652 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-12-08 16:13:27,653 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2018-12-08 16:13:27,655 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 42. [2018-12-08 16:13:27,655 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-12-08 16:13:27,656 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 47 transitions. [2018-12-08 16:13:27,656 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 47 transitions. Word has length 36 [2018-12-08 16:13:27,656 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-08 16:13:27,656 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 47 transitions. [2018-12-08 16:13:27,656 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-12-08 16:13:27,656 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 47 transitions. [2018-12-08 16:13:27,657 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2018-12-08 16:13:27,657 INFO L394 BasicCegarLoop]: Found error trace [2018-12-08 16:13:27,657 INFO L402 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-08 16:13:27,657 INFO L423 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-08 16:13:27,657 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-08 16:13:27,657 INFO L82 PathProgramCache]: Analyzing trace with hash 1655062492, now seen corresponding path program 4 times [2018-12-08 16:13:27,657 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-12-08 16:13:27,657 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-12-08 16:13:27,658 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 16:13:27,658 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-08 16:13:27,658 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 16:13:27,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-08 16:13:27,703 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2018-12-08 16:13:27,703 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-08 16:13:27,703 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_dbb4eb83-8643-4acf-8e48-43ac9ddbbbf9/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 [2018-12-08 16:13:27,708 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-08 16:13:27,721 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-08 16:13:27,721 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-08 16:13:27,723 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-08 16:13:27,730 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2018-12-08 16:13:27,744 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-12-08 16:13:27,745 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2018-12-08 16:13:27,745 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-12-08 16:13:27,745 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-12-08 16:13:27,745 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2018-12-08 16:13:27,745 INFO L87 Difference]: Start difference. First operand 42 states and 47 transitions. Second operand 8 states. [2018-12-08 16:13:27,805 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-08 16:13:27,805 INFO L93 Difference]: Finished difference Result 93 states and 114 transitions. [2018-12-08 16:13:27,805 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-12-08 16:13:27,805 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 40 [2018-12-08 16:13:27,805 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-08 16:13:27,806 INFO L225 Difference]: With dead ends: 93 [2018-12-08 16:13:27,806 INFO L226 Difference]: Without dead ends: 66 [2018-12-08 16:13:27,806 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2018-12-08 16:13:27,806 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2018-12-08 16:13:27,808 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 46. [2018-12-08 16:13:27,809 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2018-12-08 16:13:27,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 51 transitions. [2018-12-08 16:13:27,809 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 51 transitions. Word has length 40 [2018-12-08 16:13:27,809 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-08 16:13:27,809 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 51 transitions. [2018-12-08 16:13:27,809 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-12-08 16:13:27,809 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 51 transitions. [2018-12-08 16:13:27,810 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-12-08 16:13:27,810 INFO L394 BasicCegarLoop]: Found error trace [2018-12-08 16:13:27,810 INFO L402 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-08 16:13:27,810 INFO L423 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-08 16:13:27,810 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-08 16:13:27,810 INFO L82 PathProgramCache]: Analyzing trace with hash 349736732, now seen corresponding path program 5 times [2018-12-08 16:13:27,811 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-12-08 16:13:27,811 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-12-08 16:13:27,811 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 16:13:27,811 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-08 16:13:27,811 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-08 16:13:27,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-12-08 16:13:27,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-12-08 16:13:27,861 INFO L469 BasicCegarLoop]: Counterexample might be feasible [2018-12-08 16:13:27,885 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 08.12 04:13:27 BoogieIcfgContainer [2018-12-08 16:13:27,885 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-12-08 16:13:27,886 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2018-12-08 16:13:27,886 INFO L271 PluginConnector]: Initializing Witness Printer... [2018-12-08 16:13:27,886 INFO L276 PluginConnector]: Witness Printer initialized [2018-12-08 16:13:27,886 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 08.12 04:13:26" (3/4) ... [2018-12-08 16:13:27,888 INFO L147 WitnessPrinter]: No result that supports witness generation found [2018-12-08 16:13:27,888 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2018-12-08 16:13:27,889 INFO L168 Benchmark]: Toolchain (without parser) took 1310.04 ms. Allocated memory was 1.0 GB in the beginning and 1.1 GB in the end (delta: 106.4 MB). Free memory was 957.1 MB in the beginning and 916.4 MB in the end (delta: 40.7 MB). Peak memory consumption was 147.1 MB. Max. memory is 11.5 GB. [2018-12-08 16:13:27,890 INFO L168 Benchmark]: CDTParser took 0.14 ms. Allocated memory is still 1.0 GB. Free memory is still 976.9 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-12-08 16:13:27,890 INFO L168 Benchmark]: CACSL2BoogieTranslator took 144.88 ms. Allocated memory is still 1.0 GB. Free memory was 957.1 MB in the beginning and 945.3 MB in the end (delta: 11.8 MB). Peak memory consumption was 11.8 MB. Max. memory is 11.5 GB. [2018-12-08 16:13:27,891 INFO L168 Benchmark]: Boogie Procedure Inliner took 42.31 ms. Allocated memory was 1.0 GB in the beginning and 1.1 GB in the end (delta: 106.4 MB). Free memory was 945.3 MB in the beginning and 1.1 GB in the end (delta: -156.5 MB). Peak memory consumption was 12.9 MB. Max. memory is 11.5 GB. [2018-12-08 16:13:27,891 INFO L168 Benchmark]: Boogie Preprocessor took 18.43 ms. Allocated memory is still 1.1 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB. [2018-12-08 16:13:27,891 INFO L168 Benchmark]: RCFGBuilder took 169.41 ms. Allocated memory is still 1.1 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 19.7 MB). Peak memory consumption was 19.7 MB. Max. memory is 11.5 GB. [2018-12-08 16:13:27,891 INFO L168 Benchmark]: TraceAbstraction took 929.54 ms. Allocated memory is still 1.1 GB. Free memory was 1.1 GB in the beginning and 916.4 MB in the end (delta: 165.7 MB). Peak memory consumption was 165.7 MB. Max. memory is 11.5 GB. [2018-12-08 16:13:27,892 INFO L168 Benchmark]: Witness Printer took 2.96 ms. Allocated memory is still 1.1 GB. Free memory is still 916.4 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-12-08 16:13:27,893 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.14 ms. Allocated memory is still 1.0 GB. Free memory is still 976.9 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 144.88 ms. Allocated memory is still 1.0 GB. Free memory was 957.1 MB in the beginning and 945.3 MB in the end (delta: 11.8 MB). Peak memory consumption was 11.8 MB. Max. memory is 11.5 GB. * Boogie Procedure Inliner took 42.31 ms. Allocated memory was 1.0 GB in the beginning and 1.1 GB in the end (delta: 106.4 MB). Free memory was 945.3 MB in the beginning and 1.1 GB in the end (delta: -156.5 MB). Peak memory consumption was 12.9 MB. Max. memory is 11.5 GB. * Boogie Preprocessor took 18.43 ms. Allocated memory is still 1.1 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB. * RCFGBuilder took 169.41 ms. Allocated memory is still 1.1 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 19.7 MB). Peak memory consumption was 19.7 MB. Max. memory is 11.5 GB. * TraceAbstraction took 929.54 ms. Allocated memory is still 1.1 GB. Free memory was 1.1 GB in the beginning and 916.4 MB in the end (delta: 165.7 MB). Peak memory consumption was 165.7 MB. Max. memory is 11.5 GB. * Witness Printer took 2.96 ms. Allocated memory is still 1.1 GB. Free memory is still 916.4 MB. There was no memory consumed. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - UnprovableResult [Line: 6]: Unable to prove that call of __VERIFIER_error() unreachable Unable to prove that call of __VERIFIER_error() unreachable Reason: overapproximation of shiftLeft at line 55. Possible FailurePath: [L17] char string_A[5], string_B[5]; [L18] int i, j, nc_A, nc_B, found=0; [L21] i=0 VAL [found=0, i=0, string_A={7:0}, string_B={10:0}] [L21] COND TRUE i<5 [L22] string_A[i]=__VERIFIER_nondet_char() [L21] i++ VAL [found=0, i=1, string_A={7:0}, string_B={10:0}] [L21] COND TRUE i<5 [L22] string_A[i]=__VERIFIER_nondet_char() [L21] i++ VAL [found=0, i=2, string_A={7:0}, string_B={10:0}] [L21] COND TRUE i<5 [L22] string_A[i]=__VERIFIER_nondet_char() [L21] i++ VAL [found=0, i=3, string_A={7:0}, string_B={10:0}] [L21] COND TRUE i<5 [L22] string_A[i]=__VERIFIER_nondet_char() [L21] i++ VAL [found=0, i=4, string_A={7:0}, string_B={10:0}] [L21] COND TRUE i<5 [L22] string_A[i]=__VERIFIER_nondet_char() [L21] i++ VAL [found=0, i=5, string_A={7:0}, string_B={10:0}] [L21] COND FALSE !(i<5) VAL [found=0, i=5, string_A={7:0}, string_B={10:0}] [L23] EXPR string_A[5 -1] VAL [found=0, i=5, string_A={7:0}, string_A[5 -1]=0, string_B={10:0}] [L23] COND FALSE !(!(string_A[5 -1]=='\0')) [L25] i=0 VAL [found=0, i=0, string_A={7:0}, string_B={10:0}] [L25] COND TRUE i<5 [L26] string_B[i]=__VERIFIER_nondet_char() [L25] i++ VAL [found=0, i=1, string_A={7:0}, string_B={10:0}] [L25] COND TRUE i<5 [L26] string_B[i]=__VERIFIER_nondet_char() [L25] i++ VAL [found=0, i=2, string_A={7:0}, string_B={10:0}] [L25] COND TRUE i<5 [L26] string_B[i]=__VERIFIER_nondet_char() [L25] i++ VAL [found=0, i=3, string_A={7:0}, string_B={10:0}] [L25] COND TRUE i<5 [L26] string_B[i]=__VERIFIER_nondet_char() [L25] i++ VAL [found=0, i=4, string_A={7:0}, string_B={10:0}] [L25] COND TRUE i<5 [L26] string_B[i]=__VERIFIER_nondet_char() [L25] i++ VAL [found=0, i=5, string_A={7:0}, string_B={10:0}] [L25] COND FALSE !(i<5) VAL [found=0, i=5, string_A={7:0}, string_B={10:0}] [L27] EXPR string_B[5 -1] VAL [found=0, i=5, string_A={7:0}, string_B={10:0}, string_B[5 -1]=0] [L27] COND FALSE !(!(string_B[5 -1]=='\0')) [L29] nc_A = 0 VAL [found=0, i=5, nc_A=0, string_A={7:0}, string_B={10:0}] [L30] EXPR string_A[nc_A] VAL [found=0, i=5, nc_A=0, string_A={7:0}, string_A[nc_A]=0, string_B={10:0}] [L30] COND FALSE !(string_A[nc_A]!='\0') [L33] nc_B = 0 VAL [found=0, i=5, nc_A=0, nc_B=0, string_A={7:0}, string_B={10:0}] [L34] EXPR string_B[nc_B] VAL [found=0, i=5, nc_A=0, nc_B=0, string_A={7:0}, string_B={10:0}, string_B[nc_B]=0] [L34] COND FALSE !(string_B[nc_B]!='\0') [L37] COND FALSE !(!(nc_B >= nc_A)) [L40] EXPR j=0 [L40] i=j=0 VAL [found=0, i=0, j=0, nc_A=0, nc_B=0, string_A={7:0}, string_B={10:0}] [L41] COND FALSE !((inc_B-1)< main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/working_dir_dbb4eb83-8643-4acf-8e48-43ac9ddbbbf9/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 [2018-12-08 16:13:29,231 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-12-08 16:13:29,238 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-12-08 16:13:29,240 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-12-08 16:13:29,241 INFO L271 PluginConnector]: Initializing CDTParser... [2018-12-08 16:13:29,242 INFO L276 PluginConnector]: CDTParser initialized [2018-12-08 16:13:29,242 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/working_dir_dbb4eb83-8643-4acf-8e48-43ac9ddbbbf9/bin-2019/uautomizer/../../sv-benchmarks/c/loops/string_false-unreach-call_true-termination.i [2018-12-08 16:13:29,277 INFO L221 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_dbb4eb83-8643-4acf-8e48-43ac9ddbbbf9/bin-2019/uautomizer/data/0f5d32ba9/8140b2d1a3ae4a79b320ac1dcaec5ab5/FLAGeb005f422 [2018-12-08 16:13:29,608 INFO L307 CDTParser]: Found 1 translation units. [2018-12-08 16:13:29,608 INFO L161 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/working_dir_dbb4eb83-8643-4acf-8e48-43ac9ddbbbf9/sv-benchmarks/c/loops/string_false-unreach-call_true-termination.i [2018-12-08 16:13:29,612 INFO L355 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_dbb4eb83-8643-4acf-8e48-43ac9ddbbbf9/bin-2019/uautomizer/data/0f5d32ba9/8140b2d1a3ae4a79b320ac1dcaec5ab5/FLAGeb005f422 [2018-12-08 16:13:29,620 INFO L363 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/working_dir_dbb4eb83-8643-4acf-8e48-43ac9ddbbbf9/bin-2019/uautomizer/data/0f5d32ba9/8140b2d1a3ae4a79b320ac1dcaec5ab5 [2018-12-08 16:13:29,622 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-12-08 16:13:29,623 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2018-12-08 16:13:29,623 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-12-08 16:13:29,623 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-12-08 16:13:29,626 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-12-08 16:13:29,626 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 08.12 04:13:29" (1/1) ... [2018-12-08 16:13:29,628 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@35441f16 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.12 04:13:29, skipping insertion in model container [2018-12-08 16:13:29,628 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 08.12 04:13:29" (1/1) ... [2018-12-08 16:13:29,632 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-12-08 16:13:29,642 INFO L176 MainTranslator]: Built tables and reachable declarations [2018-12-08 16:13:29,736 INFO L203 PostProcessor]: Analyzing one entry point: main [2018-12-08 16:13:29,738 INFO L191 MainTranslator]: Completed pre-run [2018-12-08 16:13:29,754 INFO L203 PostProcessor]: Analyzing one entry point: main [2018-12-08 16:13:29,767 INFO L195 MainTranslator]: Completed translation [2018-12-08 16:13:29,767 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.12 04:13:29 WrapperNode [2018-12-08 16:13:29,767 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-12-08 16:13:29,768 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-12-08 16:13:29,768 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-12-08 16:13:29,768 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-12-08 16:13:29,773 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.12 04:13:29" (1/1) ... [2018-12-08 16:13:29,778 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.12 04:13:29" (1/1) ... [2018-12-08 16:13:29,783 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-12-08 16:13:29,783 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-12-08 16:13:29,783 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-12-08 16:13:29,783 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-12-08 16:13:29,788 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.12 04:13:29" (1/1) ... [2018-12-08 16:13:29,789 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.12 04:13:29" (1/1) ... [2018-12-08 16:13:29,790 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.12 04:13:29" (1/1) ... [2018-12-08 16:13:29,790 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.12 04:13:29" (1/1) ... [2018-12-08 16:13:29,796 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.12 04:13:29" (1/1) ... [2018-12-08 16:13:29,800 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.12 04:13:29" (1/1) ... [2018-12-08 16:13:29,801 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.12 04:13:29" (1/1) ... [2018-12-08 16:13:29,802 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-12-08 16:13:29,802 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-12-08 16:13:29,803 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-12-08 16:13:29,803 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-12-08 16:13:29,803 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.12 04:13:29" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_dbb4eb83-8643-4acf-8e48-43ac9ddbbbf9/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 [2018-12-08 16:13:29,865 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-12-08 16:13:29,865 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-12-08 16:13:29,865 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-12-08 16:13:29,865 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE1 [2018-12-08 16:13:29,866 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-12-08 16:13:29,866 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-12-08 16:13:29,866 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-12-08 16:13:29,866 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-12-08 16:13:29,866 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-12-08 16:13:29,866 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-12-08 16:13:29,866 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE1 [2018-12-08 16:13:29,866 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-12-08 16:13:30,031 INFO L275 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-12-08 16:13:30,031 INFO L280 CfgBuilder]: Removed 5 assue(true) statements. [2018-12-08 16:13:30,031 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 08.12 04:13:30 BoogieIcfgContainer [2018-12-08 16:13:30,031 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-12-08 16:13:30,032 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-12-08 16:13:30,032 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-12-08 16:13:30,034 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-12-08 16:13:30,034 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 08.12 04:13:29" (1/3) ... [2018-12-08 16:13:30,034 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@734a8647 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 08.12 04:13:30, skipping insertion in model container [2018-12-08 16:13:30,034 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.12 04:13:29" (2/3) ... [2018-12-08 16:13:30,034 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@734a8647 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 08.12 04:13:30, skipping insertion in model container [2018-12-08 16:13:30,034 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 08.12 04:13:30" (3/3) ... [2018-12-08 16:13:30,035 INFO L112 eAbstractionObserver]: Analyzing ICFG string_false-unreach-call_true-termination.i [2018-12-08 16:13:30,041 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-12-08 16:13:30,045 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-12-08 16:13:30,054 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-12-08 16:13:30,070 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-12-08 16:13:30,071 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-12-08 16:13:30,071 INFO L383 AbstractCegarLoop]: Hoare is true [2018-12-08 16:13:30,071 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-12-08 16:13:30,071 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-12-08 16:13:30,071 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-12-08 16:13:30,071 INFO L387 AbstractCegarLoop]: Difference is false [2018-12-08 16:13:30,071 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-12-08 16:13:30,071 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-12-08 16:13:30,081 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states. [2018-12-08 16:13:30,084 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-12-08 16:13:30,085 INFO L394 BasicCegarLoop]: Found error trace [2018-12-08 16:13:30,085 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-08 16:13:30,086 INFO L423 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-08 16:13:30,089 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-08 16:13:30,089 INFO L82 PathProgramCache]: Analyzing trace with hash -99599224, now seen corresponding path program 1 times [2018-12-08 16:13:30,092 INFO L223 ckRefinementStrategy]: Switched to mode CVC4_FPBP [2018-12-08 16:13:30,092 INFO L69 tionRefinementEngine]: Using refinement strategy WolfRefinementStrategy No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_dbb4eb83-8643-4acf-8e48-43ac9ddbbbf9/bin-2019/uautomizer/cvc4 Starting monitored process 2 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2018-12-08 16:13:30,106 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-08 16:13:30,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-08 16:13:30,139 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-08 16:13:30,155 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-08 16:13:30,155 INFO L312 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2018-12-08 16:13:30,158 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-08 16:13:30,158 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-12-08 16:13:30,161 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-12-08 16:13:30,168 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-12-08 16:13:30,169 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-12-08 16:13:30,170 INFO L87 Difference]: Start difference. First operand 35 states. Second operand 2 states. [2018-12-08 16:13:30,182 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-08 16:13:30,182 INFO L93 Difference]: Finished difference Result 62 states and 89 transitions. [2018-12-08 16:13:30,182 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-12-08 16:13:30,183 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 22 [2018-12-08 16:13:30,183 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-08 16:13:30,187 INFO L225 Difference]: With dead ends: 62 [2018-12-08 16:13:30,187 INFO L226 Difference]: Without dead ends: 28 [2018-12-08 16:13:30,189 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-12-08 16:13:30,199 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-12-08 16:13:30,207 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2018-12-08 16:13:30,208 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2018-12-08 16:13:30,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 33 transitions. [2018-12-08 16:13:30,209 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 33 transitions. Word has length 22 [2018-12-08 16:13:30,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-08 16:13:30,210 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 33 transitions. [2018-12-08 16:13:30,210 INFO L481 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-12-08 16:13:30,210 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 33 transitions. [2018-12-08 16:13:30,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-12-08 16:13:30,210 INFO L394 BasicCegarLoop]: Found error trace [2018-12-08 16:13:30,210 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-08 16:13:30,211 INFO L423 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-08 16:13:30,211 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-08 16:13:30,211 INFO L82 PathProgramCache]: Analyzing trace with hash 930552028, now seen corresponding path program 1 times [2018-12-08 16:13:30,211 INFO L223 ckRefinementStrategy]: Switched to mode CVC4_FPBP [2018-12-08 16:13:30,211 INFO L69 tionRefinementEngine]: Using refinement strategy WolfRefinementStrategy No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_dbb4eb83-8643-4acf-8e48-43ac9ddbbbf9/bin-2019/uautomizer/cvc4 Starting monitored process 3 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2018-12-08 16:13:30,228 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-08 16:13:30,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-08 16:13:30,263 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-08 16:13:30,278 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-08 16:13:30,278 INFO L312 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2018-12-08 16:13:30,279 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-08 16:13:30,279 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-12-08 16:13:30,280 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-12-08 16:13:30,280 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-12-08 16:13:30,281 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-12-08 16:13:30,281 INFO L87 Difference]: Start difference. First operand 28 states and 33 transitions. Second operand 3 states. [2018-12-08 16:13:30,330 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-08 16:13:30,330 INFO L93 Difference]: Finished difference Result 56 states and 69 transitions. [2018-12-08 16:13:30,331 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-12-08 16:13:30,331 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2018-12-08 16:13:30,331 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-08 16:13:30,334 INFO L225 Difference]: With dead ends: 56 [2018-12-08 16:13:30,334 INFO L226 Difference]: Without dead ends: 36 [2018-12-08 16:13:30,334 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-12-08 16:13:30,335 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-12-08 16:13:30,339 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 30. [2018-12-08 16:13:30,340 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-12-08 16:13:30,340 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 35 transitions. [2018-12-08 16:13:30,340 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 35 transitions. Word has length 24 [2018-12-08 16:13:30,341 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-08 16:13:30,341 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 35 transitions. [2018-12-08 16:13:30,341 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-12-08 16:13:30,341 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 35 transitions. [2018-12-08 16:13:30,342 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-12-08 16:13:30,342 INFO L394 BasicCegarLoop]: Found error trace [2018-12-08 16:13:30,342 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-08 16:13:30,342 INFO L423 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-08 16:13:30,342 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-08 16:13:30,342 INFO L82 PathProgramCache]: Analyzing trace with hash 1358146588, now seen corresponding path program 1 times [2018-12-08 16:13:30,343 INFO L223 ckRefinementStrategy]: Switched to mode CVC4_FPBP [2018-12-08 16:13:30,343 INFO L69 tionRefinementEngine]: Using refinement strategy WolfRefinementStrategy No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_dbb4eb83-8643-4acf-8e48-43ac9ddbbbf9/bin-2019/uautomizer/cvc4 Starting monitored process 4 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2018-12-08 16:13:30,362 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-08 16:13:30,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-08 16:13:30,412 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-08 16:13:30,429 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-12-08 16:13:30,429 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-08 16:13:30,457 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-12-08 16:13:30,458 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-12-08 16:13:30,459 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6 [2018-12-08 16:13:30,459 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-12-08 16:13:30,459 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-12-08 16:13:30,459 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-12-08 16:13:30,460 INFO L87 Difference]: Start difference. First operand 30 states and 35 transitions. Second operand 6 states. [2018-12-08 16:13:30,618 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-08 16:13:30,618 INFO L93 Difference]: Finished difference Result 79 states and 102 transitions. [2018-12-08 16:13:30,619 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-12-08 16:13:30,619 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 28 [2018-12-08 16:13:30,619 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-08 16:13:30,620 INFO L225 Difference]: With dead ends: 79 [2018-12-08 16:13:30,620 INFO L226 Difference]: Without dead ends: 58 [2018-12-08 16:13:30,621 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=23, Unknown=0, NotChecked=0, Total=42 [2018-12-08 16:13:30,621 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2018-12-08 16:13:30,625 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 42. [2018-12-08 16:13:30,626 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-12-08 16:13:30,626 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 47 transitions. [2018-12-08 16:13:30,627 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 47 transitions. Word has length 28 [2018-12-08 16:13:30,627 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-08 16:13:30,627 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 47 transitions. [2018-12-08 16:13:30,627 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-12-08 16:13:30,627 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 47 transitions. [2018-12-08 16:13:30,628 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2018-12-08 16:13:30,628 INFO L394 BasicCegarLoop]: Found error trace [2018-12-08 16:13:30,628 INFO L402 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-08 16:13:30,628 INFO L423 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-08 16:13:30,628 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-08 16:13:30,628 INFO L82 PathProgramCache]: Analyzing trace with hash 1655062492, now seen corresponding path program 2 times [2018-12-08 16:13:30,629 INFO L223 ckRefinementStrategy]: Switched to mode CVC4_FPBP [2018-12-08 16:13:30,629 INFO L69 tionRefinementEngine]: Using refinement strategy WolfRefinementStrategy No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_dbb4eb83-8643-4acf-8e48-43ac9ddbbbf9/bin-2019/uautomizer/cvc4 Starting monitored process 5 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2018-12-08 16:13:30,641 INFO L101 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2018-12-08 16:13:30,673 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2018-12-08 16:13:30,673 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-08 16:13:30,675 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-08 16:13:30,716 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2018-12-08 16:13:30,716 INFO L312 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2018-12-08 16:13:30,717 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-08 16:13:30,717 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2018-12-08 16:13:30,718 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-12-08 16:13:30,718 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-12-08 16:13:30,718 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2018-12-08 16:13:30,718 INFO L87 Difference]: Start difference. First operand 42 states and 47 transitions. Second operand 8 states. [2018-12-08 16:13:30,822 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-08 16:13:30,822 INFO L93 Difference]: Finished difference Result 68 states and 80 transitions. [2018-12-08 16:13:30,822 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-12-08 16:13:30,822 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 40 [2018-12-08 16:13:30,822 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-08 16:13:30,823 INFO L225 Difference]: With dead ends: 68 [2018-12-08 16:13:30,823 INFO L226 Difference]: Without dead ends: 54 [2018-12-08 16:13:30,823 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=80, Unknown=0, NotChecked=0, Total=110 [2018-12-08 16:13:30,823 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2018-12-08 16:13:30,826 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 47. [2018-12-08 16:13:30,826 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2018-12-08 16:13:30,827 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 53 transitions. [2018-12-08 16:13:30,827 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 53 transitions. Word has length 40 [2018-12-08 16:13:30,827 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-08 16:13:30,827 INFO L480 AbstractCegarLoop]: Abstraction has 47 states and 53 transitions. [2018-12-08 16:13:30,827 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-12-08 16:13:30,827 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 53 transitions. [2018-12-08 16:13:30,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2018-12-08 16:13:30,828 INFO L394 BasicCegarLoop]: Found error trace [2018-12-08 16:13:30,828 INFO L402 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-08 16:13:30,828 INFO L423 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-08 16:13:30,828 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-08 16:13:30,828 INFO L82 PathProgramCache]: Analyzing trace with hash -1489958921, now seen corresponding path program 1 times [2018-12-08 16:13:30,829 INFO L223 ckRefinementStrategy]: Switched to mode CVC4_FPBP [2018-12-08 16:13:30,829 INFO L69 tionRefinementEngine]: Using refinement strategy WolfRefinementStrategy No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_dbb4eb83-8643-4acf-8e48-43ac9ddbbbf9/bin-2019/uautomizer/cvc4 Starting monitored process 6 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2018-12-08 16:13:30,841 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-08 16:13:30,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-08 16:13:30,892 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-08 16:13:30,913 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2018-12-08 16:13:30,913 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-08 16:13:30,985 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2018-12-08 16:13:30,987 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-12-08 16:13:30,987 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2018-12-08 16:13:30,987 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-12-08 16:13:30,987 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-12-08 16:13:30,987 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2018-12-08 16:13:30,987 INFO L87 Difference]: Start difference. First operand 47 states and 53 transitions. Second operand 12 states. [2018-12-08 16:13:31,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-08 16:13:31,279 INFO L93 Difference]: Finished difference Result 105 states and 128 transitions. [2018-12-08 16:13:31,280 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-12-08 16:13:31,280 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 42 [2018-12-08 16:13:31,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-08 16:13:31,281 INFO L225 Difference]: With dead ends: 105 [2018-12-08 16:13:31,281 INFO L226 Difference]: Without dead ends: 73 [2018-12-08 16:13:31,282 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2018-12-08 16:13:31,282 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2018-12-08 16:13:31,285 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 51. [2018-12-08 16:13:31,285 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-12-08 16:13:31,286 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 57 transitions. [2018-12-08 16:13:31,286 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 57 transitions. Word has length 42 [2018-12-08 16:13:31,286 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-08 16:13:31,286 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 57 transitions. [2018-12-08 16:13:31,286 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-12-08 16:13:31,286 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 57 transitions. [2018-12-08 16:13:31,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-12-08 16:13:31,287 INFO L394 BasicCegarLoop]: Found error trace [2018-12-08 16:13:31,287 INFO L402 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-08 16:13:31,287 INFO L423 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-08 16:13:31,287 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-08 16:13:31,287 INFO L82 PathProgramCache]: Analyzing trace with hash -1777563849, now seen corresponding path program 2 times [2018-12-08 16:13:31,288 INFO L223 ckRefinementStrategy]: Switched to mode CVC4_FPBP [2018-12-08 16:13:31,288 INFO L69 tionRefinementEngine]: Using refinement strategy WolfRefinementStrategy No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_dbb4eb83-8643-4acf-8e48-43ac9ddbbbf9/bin-2019/uautomizer/cvc4 Starting monitored process 7 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2018-12-08 16:13:31,301 INFO L101 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2018-12-08 16:13:31,331 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2018-12-08 16:13:31,331 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-08 16:13:31,333 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-08 16:13:31,367 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2018-12-08 16:13:31,368 INFO L312 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2018-12-08 16:13:31,368 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-08 16:13:31,369 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2018-12-08 16:13:31,369 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-12-08 16:13:31,369 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-12-08 16:13:31,369 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-12-08 16:13:31,369 INFO L87 Difference]: Start difference. First operand 51 states and 57 transitions. Second operand 6 states. [2018-12-08 16:13:31,464 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-08 16:13:31,464 INFO L93 Difference]: Finished difference Result 59 states and 66 transitions. [2018-12-08 16:13:31,464 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-12-08 16:13:31,464 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 46 [2018-12-08 16:13:31,465 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-08 16:13:31,465 INFO L225 Difference]: With dead ends: 59 [2018-12-08 16:13:31,465 INFO L226 Difference]: Without dead ends: 53 [2018-12-08 16:13:31,465 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2018-12-08 16:13:31,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2018-12-08 16:13:31,469 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 52. [2018-12-08 16:13:31,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2018-12-08 16:13:31,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 58 transitions. [2018-12-08 16:13:31,470 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 58 transitions. Word has length 46 [2018-12-08 16:13:31,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-08 16:13:31,470 INFO L480 AbstractCegarLoop]: Abstraction has 52 states and 58 transitions. [2018-12-08 16:13:31,470 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-12-08 16:13:31,470 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 58 transitions. [2018-12-08 16:13:31,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2018-12-08 16:13:31,471 INFO L394 BasicCegarLoop]: Found error trace [2018-12-08 16:13:31,471 INFO L402 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-08 16:13:31,471 INFO L423 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-08 16:13:31,471 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-08 16:13:31,471 INFO L82 PathProgramCache]: Analyzing trace with hash 1835345178, now seen corresponding path program 1 times [2018-12-08 16:13:31,472 INFO L223 ckRefinementStrategy]: Switched to mode CVC4_FPBP [2018-12-08 16:13:31,472 INFO L69 tionRefinementEngine]: Using refinement strategy WolfRefinementStrategy No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_dbb4eb83-8643-4acf-8e48-43ac9ddbbbf9/bin-2019/uautomizer/cvc4 Starting monitored process 8 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2018-12-08 16:13:31,486 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-08 16:13:31,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-08 16:13:31,543 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-08 16:13:31,559 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2018-12-08 16:13:31,559 INFO L312 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2018-12-08 16:13:31,560 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-08 16:13:31,561 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2018-12-08 16:13:31,561 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-12-08 16:13:31,561 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-12-08 16:13:31,561 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2018-12-08 16:13:31,561 INFO L87 Difference]: Start difference. First operand 52 states and 58 transitions. Second operand 4 states. [2018-12-08 16:13:31,593 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-08 16:13:31,594 INFO L93 Difference]: Finished difference Result 64 states and 72 transitions. [2018-12-08 16:13:31,594 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-12-08 16:13:31,594 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 48 [2018-12-08 16:13:31,595 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-08 16:13:31,595 INFO L225 Difference]: With dead ends: 64 [2018-12-08 16:13:31,595 INFO L226 Difference]: Without dead ends: 49 [2018-12-08 16:13:31,595 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2018-12-08 16:13:31,595 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-12-08 16:13:31,598 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2018-12-08 16:13:31,598 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2018-12-08 16:13:31,599 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 54 transitions. [2018-12-08 16:13:31,599 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 54 transitions. Word has length 48 [2018-12-08 16:13:31,599 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-08 16:13:31,599 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 54 transitions. [2018-12-08 16:13:31,599 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-12-08 16:13:31,599 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 54 transitions. [2018-12-08 16:13:31,600 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2018-12-08 16:13:31,600 INFO L394 BasicCegarLoop]: Found error trace [2018-12-08 16:13:31,600 INFO L402 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-08 16:13:31,600 INFO L423 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-08 16:13:31,600 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-08 16:13:31,600 INFO L82 PathProgramCache]: Analyzing trace with hash -1547819580, now seen corresponding path program 1 times [2018-12-08 16:13:31,600 INFO L223 ckRefinementStrategy]: Switched to mode CVC4_FPBP [2018-12-08 16:13:31,600 INFO L69 tionRefinementEngine]: Using refinement strategy WolfRefinementStrategy No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_dbb4eb83-8643-4acf-8e48-43ac9ddbbbf9/bin-2019/uautomizer/cvc4 Starting monitored process 9 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2018-12-08 16:13:31,613 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-08 16:13:31,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-08 16:13:31,667 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-08 16:13:31,688 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2018-12-08 16:13:31,689 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-08 16:13:31,711 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2018-12-08 16:13:31,712 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-12-08 16:13:31,712 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2018-12-08 16:13:31,712 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-12-08 16:13:31,712 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-12-08 16:13:31,713 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2018-12-08 16:13:31,713 INFO L87 Difference]: Start difference. First operand 49 states and 54 transitions. Second operand 8 states. [2018-12-08 16:13:31,825 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-08 16:13:31,825 INFO L93 Difference]: Finished difference Result 100 states and 121 transitions. [2018-12-08 16:13:31,826 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-12-08 16:13:31,826 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 48 [2018-12-08 16:13:31,826 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-08 16:13:31,826 INFO L225 Difference]: With dead ends: 100 [2018-12-08 16:13:31,826 INFO L226 Difference]: Without dead ends: 88 [2018-12-08 16:13:31,827 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 89 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=39, Invalid=71, Unknown=0, NotChecked=0, Total=110 [2018-12-08 16:13:31,827 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2018-12-08 16:13:31,832 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 58. [2018-12-08 16:13:31,832 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2018-12-08 16:13:31,832 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 66 transitions. [2018-12-08 16:13:31,833 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 66 transitions. Word has length 48 [2018-12-08 16:13:31,833 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-08 16:13:31,833 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 66 transitions. [2018-12-08 16:13:31,833 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-12-08 16:13:31,833 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 66 transitions. [2018-12-08 16:13:31,833 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2018-12-08 16:13:31,833 INFO L394 BasicCegarLoop]: Found error trace [2018-12-08 16:13:31,834 INFO L402 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-08 16:13:31,834 INFO L423 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-08 16:13:31,834 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-08 16:13:31,834 INFO L82 PathProgramCache]: Analyzing trace with hash -915073569, now seen corresponding path program 1 times [2018-12-08 16:13:31,834 INFO L223 ckRefinementStrategy]: Switched to mode CVC4_FPBP [2018-12-08 16:13:31,834 INFO L69 tionRefinementEngine]: Using refinement strategy WolfRefinementStrategy No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_dbb4eb83-8643-4acf-8e48-43ac9ddbbbf9/bin-2019/uautomizer/cvc4 Starting monitored process 10 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2018-12-08 16:13:31,848 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-08 16:13:32,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-12-08 16:13:32,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-12-08 16:13:32,447 INFO L469 BasicCegarLoop]: Counterexample might be feasible [2018-12-08 16:13:32,474 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 08.12 04:13:32 BoogieIcfgContainer [2018-12-08 16:13:32,474 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-12-08 16:13:32,474 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2018-12-08 16:13:32,474 INFO L271 PluginConnector]: Initializing Witness Printer... [2018-12-08 16:13:32,474 INFO L276 PluginConnector]: Witness Printer initialized [2018-12-08 16:13:32,475 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 08.12 04:13:30" (3/4) ... [2018-12-08 16:13:32,476 INFO L138 WitnessPrinter]: Generating witness for reachability counterexample [2018-12-08 16:13:32,527 INFO L145 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/working_dir_dbb4eb83-8643-4acf-8e48-43ac9ddbbbf9/bin-2019/uautomizer/witness.graphml [2018-12-08 16:13:32,527 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2018-12-08 16:13:32,527 INFO L168 Benchmark]: Toolchain (without parser) took 2905.12 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 141.6 MB). Free memory was 943.4 MB in the beginning and 814.0 MB in the end (delta: 129.4 MB). Peak memory consumption was 270.9 MB. Max. memory is 11.5 GB. [2018-12-08 16:13:32,528 INFO L168 Benchmark]: CDTParser took 0.12 ms. Allocated memory is still 1.0 GB. Free memory is still 972.9 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-12-08 16:13:32,528 INFO L168 Benchmark]: CACSL2BoogieTranslator took 144.30 ms. Allocated memory is still 1.0 GB. Free memory was 943.4 MB in the beginning and 932.6 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. [2018-12-08 16:13:32,528 INFO L168 Benchmark]: Boogie Procedure Inliner took 15.12 ms. Allocated memory is still 1.0 GB. Free memory was 932.6 MB in the beginning and 927.3 MB in the end (delta: 5.4 MB). Peak memory consumption was 5.4 MB. Max. memory is 11.5 GB. [2018-12-08 16:13:32,529 INFO L168 Benchmark]: Boogie Preprocessor took 19.28 ms. Allocated memory is still 1.0 GB. Free memory is still 927.3 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-12-08 16:13:32,529 INFO L168 Benchmark]: RCFGBuilder took 228.95 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 141.6 MB). Free memory was 927.3 MB in the beginning and 1.1 GB in the end (delta: -184.0 MB). Peak memory consumption was 14.1 MB. Max. memory is 11.5 GB. [2018-12-08 16:13:32,529 INFO L168 Benchmark]: TraceAbstraction took 2442.22 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 814.0 MB in the end (delta: 297.3 MB). Peak memory consumption was 297.3 MB. Max. memory is 11.5 GB. [2018-12-08 16:13:32,529 INFO L168 Benchmark]: Witness Printer took 52.53 ms. Allocated memory is still 1.2 GB. Free memory is still 814.0 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-12-08 16:13:32,531 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.12 ms. Allocated memory is still 1.0 GB. Free memory is still 972.9 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 144.30 ms. Allocated memory is still 1.0 GB. Free memory was 943.4 MB in the beginning and 932.6 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. * Boogie Procedure Inliner took 15.12 ms. Allocated memory is still 1.0 GB. Free memory was 932.6 MB in the beginning and 927.3 MB in the end (delta: 5.4 MB). Peak memory consumption was 5.4 MB. Max. memory is 11.5 GB. * Boogie Preprocessor took 19.28 ms. Allocated memory is still 1.0 GB. Free memory is still 927.3 MB. There was no memory consumed. Max. memory is 11.5 GB. * RCFGBuilder took 228.95 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 141.6 MB). Free memory was 927.3 MB in the beginning and 1.1 GB in the end (delta: -184.0 MB). Peak memory consumption was 14.1 MB. Max. memory is 11.5 GB. * TraceAbstraction took 2442.22 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 814.0 MB in the end (delta: 297.3 MB). Peak memory consumption was 297.3 MB. Max. memory is 11.5 GB. * Witness Printer took 52.53 ms. Allocated memory is still 1.2 GB. Free memory is still 814.0 MB. There was no memory consumed. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 6]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L17] char string_A[5], string_B[5]; [L18] int i, j, nc_A, nc_B, found=0; [L21] i=0 VAL [found=0, i=0, string_A={3:0}, string_B={2:0}] [L21] COND TRUE i<5 [L22] string_A[i]=__VERIFIER_nondet_char() [L21] i++ VAL [found=0, i=1, string_A={3:0}, string_B={2:0}] [L21] COND TRUE i<5 [L22] string_A[i]=__VERIFIER_nondet_char() [L21] i++ VAL [found=0, i=2, string_A={3:0}, string_B={2:0}] [L21] COND TRUE i<5 [L22] string_A[i]=__VERIFIER_nondet_char() [L21] i++ VAL [found=0, i=3, string_A={3:0}, string_B={2:0}] [L21] COND TRUE i<5 [L22] string_A[i]=__VERIFIER_nondet_char() [L21] i++ VAL [found=0, i=4, string_A={3:0}, string_B={2:0}] [L21] COND TRUE i<5 [L22] string_A[i]=__VERIFIER_nondet_char() [L21] i++ VAL [found=0, i=5, string_A={3:0}, string_B={2:0}] [L21] COND FALSE !(i<5) VAL [found=0, i=5, string_A={3:0}, string_B={2:0}] [L23] EXPR string_A[5 -1] VAL [found=0, i=5, string_A={3:0}, string_A[5 -1]=0, string_B={2:0}] [L23] COND FALSE !(!(string_A[5 -1]=='\0')) [L25] i=0 VAL [found=0, i=0, string_A={3:0}, string_B={2:0}] [L25] COND TRUE i<5 [L26] string_B[i]=__VERIFIER_nondet_char() [L25] i++ VAL [found=0, i=1, string_A={3:0}, string_B={2:0}] [L25] COND TRUE i<5 [L26] string_B[i]=__VERIFIER_nondet_char() [L25] i++ VAL [found=0, i=2, string_A={3:0}, string_B={2:0}] [L25] COND TRUE i<5 [L26] string_B[i]=__VERIFIER_nondet_char() [L25] i++ VAL [found=0, i=3, string_A={3:0}, string_B={2:0}] [L25] COND TRUE i<5 [L26] string_B[i]=__VERIFIER_nondet_char() [L25] i++ VAL [found=0, i=4, string_A={3:0}, string_B={2:0}] [L25] COND TRUE i<5 [L26] string_B[i]=__VERIFIER_nondet_char() [L25] i++ VAL [found=0, i=5, string_A={3:0}, string_B={2:0}] [L25] COND FALSE !(i<5) VAL [found=0, i=5, string_A={3:0}, string_B={2:0}] [L27] EXPR string_B[5 -1] VAL [found=0, i=5, string_A={3:0}, string_B={2:0}, string_B[5 -1]=0] [L27] COND FALSE !(!(string_B[5 -1]=='\0')) [L29] nc_A = 0 VAL [found=0, i=5, nc_A=0, string_A={3:0}, string_B={2:0}] [L30] EXPR string_A[nc_A] VAL [found=0, i=5, nc_A=0, string_A={3:0}, string_A[nc_A]=1, string_B={2:0}] [L30] COND TRUE string_A[nc_A]!='\0' [L31] nc_A++ VAL [found=0, i=5, nc_A=1, string_A={3:0}, string_B={2:0}] [L30] EXPR string_A[nc_A] VAL [found=0, i=5, nc_A=1, string_A={3:0}, string_A[nc_A]=0, string_B={2:0}] [L30] COND FALSE !(string_A[nc_A]!='\0') [L33] nc_B = 0 VAL [found=0, i=5, nc_A=1, nc_B=0, string_A={3:0}, string_B={2:0}] [L34] EXPR string_B[nc_B] VAL [found=0, i=5, nc_A=1, nc_B=0, string_A={3:0}, string_B={2:0}, string_B[nc_B]=1] [L34] COND TRUE string_B[nc_B]!='\0' [L35] nc_B++ VAL [found=0, i=5, nc_A=1, nc_B=1, string_A={3:0}, string_B={2:0}] [L34] EXPR string_B[nc_B] VAL [found=0, i=5, nc_A=1, nc_B=1, string_A={3:0}, string_B={2:0}, string_B[nc_B]=0] [L34] COND FALSE !(string_B[nc_B]!='\0') [L37] COND FALSE !(!(nc_B >= nc_A)) [L40] EXPR j=0 [L40] i=j=0 VAL [found=0, i=0, j=0, nc_A=1, nc_B=1, string_A={3:0}, string_B={2:0}] [L41] COND TRUE (inc_B-1)<