./Ultimate.py --spec ../../sv-benchmarks/c/ReachSafety.prp --file ../../sv-benchmarks/c/loops/invert_string_false-unreach-call_true-termination.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 1dbac8bc Calling Ultimate with: java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/working_dir_acef6e98-d694-45cd-889c-4696b3b735b7/bin-2019/uautomizer/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/working_dir_acef6e98-d694-45cd-889c-4696b3b735b7/bin-2019/uautomizer/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/working_dir_acef6e98-d694-45cd-889c-4696b3b735b7/bin-2019/uautomizer/data -tc /tmp/vcloud-vcloud-master/worker/working_dir_acef6e98-d694-45cd-889c-4696b3b735b7/bin-2019/uautomizer/config/AutomizerReach.xml -i ../../sv-benchmarks/c/loops/invert_string_false-unreach-call_true-termination.i -s /tmp/vcloud-vcloud-master/worker/working_dir_acef6e98-d694-45cd-889c-4696b3b735b7/bin-2019/uautomizer/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/working_dir_acef6e98-d694-45cd-889c-4696b3b735b7/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 9eff01e8b41fd58fd007a4a54a96fca4ce69974c ....................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE --- Real Ultimate output --- This is Ultimate 0.1.23-1dbac8b [2018-11-10 05:38:46,283 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-11-10 05:38:46,284 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-11-10 05:38:46,292 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-11-10 05:38:46,292 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-11-10 05:38:46,292 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-11-10 05:38:46,293 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-11-10 05:38:46,294 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-11-10 05:38:46,295 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-11-10 05:38:46,296 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-11-10 05:38:46,297 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-11-10 05:38:46,297 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-11-10 05:38:46,298 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-11-10 05:38:46,298 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-11-10 05:38:46,299 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-11-10 05:38:46,300 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-11-10 05:38:46,300 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-11-10 05:38:46,301 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-11-10 05:38:46,303 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-11-10 05:38:46,304 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-11-10 05:38:46,305 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-11-10 05:38:46,305 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-11-10 05:38:46,307 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-11-10 05:38:46,307 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-11-10 05:38:46,307 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-11-10 05:38:46,308 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-11-10 05:38:46,309 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-11-10 05:38:46,309 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-11-10 05:38:46,310 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-11-10 05:38:46,310 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-11-10 05:38:46,311 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-11-10 05:38:46,311 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-11-10 05:38:46,311 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-11-10 05:38:46,311 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-11-10 05:38:46,312 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-11-10 05:38:46,313 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-11-10 05:38:46,313 INFO L98 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/working_dir_acef6e98-d694-45cd-889c-4696b3b735b7/bin-2019/uautomizer/config/svcomp-Reach-32bit-Automizer_Default.epf [2018-11-10 05:38:46,323 INFO L110 SettingsManager]: Loading preferences was successful [2018-11-10 05:38:46,323 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-11-10 05:38:46,324 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-11-10 05:38:46,324 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-11-10 05:38:46,324 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-11-10 05:38:46,324 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-11-10 05:38:46,325 INFO L133 SettingsManager]: * Use SBE=true [2018-11-10 05:38:46,325 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-11-10 05:38:46,325 INFO L133 SettingsManager]: * sizeof long=4 [2018-11-10 05:38:46,325 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-11-10 05:38:46,325 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-11-10 05:38:46,325 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-11-10 05:38:46,325 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-11-10 05:38:46,326 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-11-10 05:38:46,326 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-11-10 05:38:46,326 INFO L133 SettingsManager]: * sizeof long double=12 [2018-11-10 05:38:46,326 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-11-10 05:38:46,326 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-11-10 05:38:46,326 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-11-10 05:38:46,326 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-11-10 05:38:46,327 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-11-10 05:38:46,327 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-11-10 05:38:46,327 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-11-10 05:38:46,327 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-11-10 05:38:46,327 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-11-10 05:38:46,327 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-11-10 05:38:46,328 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-11-10 05:38:46,328 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-11-10 05:38:46,328 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-11-10 05:38:46,328 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_acef6e98-d694-45cd-889c-4696b3b735b7/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 -> 9eff01e8b41fd58fd007a4a54a96fca4ce69974c [2018-11-10 05:38:46,349 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-11-10 05:38:46,358 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-11-10 05:38:46,359 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-11-10 05:38:46,360 INFO L271 PluginConnector]: Initializing CDTParser... [2018-11-10 05:38:46,361 INFO L276 PluginConnector]: CDTParser initialized [2018-11-10 05:38:46,361 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/working_dir_acef6e98-d694-45cd-889c-4696b3b735b7/bin-2019/uautomizer/../../sv-benchmarks/c/loops/invert_string_false-unreach-call_true-termination.i [2018-11-10 05:38:46,397 INFO L218 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_acef6e98-d694-45cd-889c-4696b3b735b7/bin-2019/uautomizer/data/f08259efa/7d5cc8a649fc448caf64bd57835678d9/FLAGae56cf04b [2018-11-10 05:38:46,715 INFO L298 CDTParser]: Found 1 translation units. [2018-11-10 05:38:46,715 INFO L158 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/working_dir_acef6e98-d694-45cd-889c-4696b3b735b7/sv-benchmarks/c/loops/invert_string_false-unreach-call_true-termination.i [2018-11-10 05:38:46,719 INFO L346 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_acef6e98-d694-45cd-889c-4696b3b735b7/bin-2019/uautomizer/data/f08259efa/7d5cc8a649fc448caf64bd57835678d9/FLAGae56cf04b [2018-11-10 05:38:46,730 INFO L354 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/working_dir_acef6e98-d694-45cd-889c-4696b3b735b7/bin-2019/uautomizer/data/f08259efa/7d5cc8a649fc448caf64bd57835678d9 [2018-11-10 05:38:46,733 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-11-10 05:38:46,734 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-11-10 05:38:46,735 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-11-10 05:38:46,735 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-11-10 05:38:46,738 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-11-10 05:38:46,738 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 10.11 05:38:46" (1/1) ... [2018-11-10 05:38:46,740 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7ce791db and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.11 05:38:46, skipping insertion in model container [2018-11-10 05:38:46,741 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 10.11 05:38:46" (1/1) ... [2018-11-10 05:38:46,746 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-11-10 05:38:46,759 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-11-10 05:38:46,866 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-11-10 05:38:46,868 INFO L189 MainTranslator]: Completed pre-run [2018-11-10 05:38:46,880 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-11-10 05:38:46,892 INFO L193 MainTranslator]: Completed translation [2018-11-10 05:38:46,893 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.11 05:38:46 WrapperNode [2018-11-10 05:38:46,893 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-11-10 05:38:46,893 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-11-10 05:38:46,893 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-11-10 05:38:46,893 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-11-10 05:38:46,900 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.11 05:38:46" (1/1) ... [2018-11-10 05:38:46,901 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.11 05:38:46" (1/1) ... [2018-11-10 05:38:46,907 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.11 05:38:46" (1/1) ... [2018-11-10 05:38:46,907 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.11 05:38:46" (1/1) ... [2018-11-10 05:38:46,911 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.11 05:38:46" (1/1) ... [2018-11-10 05:38:46,914 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.11 05:38:46" (1/1) ... [2018-11-10 05:38:46,915 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.11 05:38:46" (1/1) ... [2018-11-10 05:38:46,916 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-11-10 05:38:46,916 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-11-10 05:38:46,916 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-11-10 05:38:46,916 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-11-10 05:38:46,917 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.11 05:38:46" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_acef6e98-d694-45cd-889c-4696b3b735b7/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 [2018-11-10 05:38:46,993 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-11-10 05:38:46,993 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-11-10 05:38:46,993 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-11-10 05:38:46,993 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-11-10 05:38:46,993 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2018-11-10 05:38:46,993 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-11-10 05:38:46,994 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2018-11-10 05:38:46,994 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2018-11-10 05:38:46,994 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-11-10 05:38:46,994 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-11-10 05:38:46,994 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2018-11-10 05:38:46,994 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2018-11-10 05:38:46,994 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-11-10 05:38:46,994 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-11-10 05:38:46,994 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-11-10 05:38:46,995 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~int [2018-11-10 05:38:47,170 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-11-10 05:38:47,170 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 10.11 05:38:47 BoogieIcfgContainer [2018-11-10 05:38:47,171 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-11-10 05:38:47,171 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-11-10 05:38:47,171 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-11-10 05:38:47,175 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-11-10 05:38:47,175 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 10.11 05:38:46" (1/3) ... [2018-11-10 05:38:47,176 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@365cb07f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 10.11 05:38:47, skipping insertion in model container [2018-11-10 05:38:47,176 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.11 05:38:46" (2/3) ... [2018-11-10 05:38:47,176 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@365cb07f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 10.11 05:38:47, skipping insertion in model container [2018-11-10 05:38:47,176 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 10.11 05:38:47" (3/3) ... [2018-11-10 05:38:47,178 INFO L112 eAbstractionObserver]: Analyzing ICFG invert_string_false-unreach-call_true-termination.i [2018-11-10 05:38:47,186 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-11-10 05:38:47,192 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-11-10 05:38:47,207 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-11-10 05:38:47,233 INFO L135 ementStrategyFactory]: Using default assertion order modulation [2018-11-10 05:38:47,234 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-11-10 05:38:47,234 INFO L383 AbstractCegarLoop]: Hoare is true [2018-11-10 05:38:47,234 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-11-10 05:38:47,234 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-11-10 05:38:47,234 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-11-10 05:38:47,235 INFO L387 AbstractCegarLoop]: Difference is false [2018-11-10 05:38:47,235 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-11-10 05:38:47,235 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-11-10 05:38:47,249 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states. [2018-11-10 05:38:47,253 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-11-10 05:38:47,253 INFO L367 BasicCegarLoop]: Found error trace [2018-11-10 05:38:47,254 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-10 05:38:47,255 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-10 05:38:47,259 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-10 05:38:47,259 INFO L82 PathProgramCache]: Analyzing trace with hash 931697409, now seen corresponding path program 1 times [2018-11-10 05:38:47,260 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-10 05:38:47,261 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-10 05:38:47,298 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 05:38:47,298 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-10 05:38:47,298 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 05:38:47,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-10 05:38:47,369 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-10 05:38:47,371 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-10 05:38:47,371 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-11-10 05:38:47,374 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-11-10 05:38:47,382 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-11-10 05:38:47,382 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-11-10 05:38:47,384 INFO L87 Difference]: Start difference. First operand 44 states. Second operand 2 states. [2018-11-10 05:38:47,402 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-10 05:38:47,403 INFO L93 Difference]: Finished difference Result 74 states and 85 transitions. [2018-11-10 05:38:47,403 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-11-10 05:38:47,403 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 22 [2018-11-10 05:38:47,404 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-10 05:38:47,409 INFO L225 Difference]: With dead ends: 74 [2018-11-10 05:38:47,409 INFO L226 Difference]: Without dead ends: 36 [2018-11-10 05:38:47,412 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-11-10 05:38:47,423 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-11-10 05:38:47,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2018-11-10 05:38:47,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-11-10 05:38:47,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2018-11-10 05:38:47,436 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 22 [2018-11-10 05:38:47,436 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-10 05:38:47,436 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2018-11-10 05:38:47,436 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-11-10 05:38:47,436 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2018-11-10 05:38:47,437 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-11-10 05:38:47,437 INFO L367 BasicCegarLoop]: Found error trace [2018-11-10 05:38:47,437 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-10 05:38:47,437 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-10 05:38:47,438 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-10 05:38:47,438 INFO L82 PathProgramCache]: Analyzing trace with hash -1467881940, now seen corresponding path program 1 times [2018-11-10 05:38:47,438 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-10 05:38:47,438 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-10 05:38:47,439 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 05:38:47,439 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-10 05:38:47,440 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 05:38:47,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-10 05:38:47,537 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-10 05:38:47,537 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-10 05:38:47,537 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-11-10 05:38:47,538 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-11-10 05:38:47,539 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-11-10 05:38:47,539 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2018-11-10 05:38:47,539 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand 5 states. [2018-11-10 05:38:47,600 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-10 05:38:47,600 INFO L93 Difference]: Finished difference Result 58 states and 61 transitions. [2018-11-10 05:38:47,600 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-11-10 05:38:47,601 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 24 [2018-11-10 05:38:47,601 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-10 05:38:47,601 INFO L225 Difference]: With dead ends: 58 [2018-11-10 05:38:47,601 INFO L226 Difference]: Without dead ends: 42 [2018-11-10 05:38:47,602 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2018-11-10 05:38:47,602 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-11-10 05:38:47,605 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 38. [2018-11-10 05:38:47,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-11-10 05:38:47,605 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2018-11-10 05:38:47,606 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 24 [2018-11-10 05:38:47,606 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-10 05:38:47,606 INFO L481 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2018-11-10 05:38:47,606 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-11-10 05:38:47,606 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2018-11-10 05:38:47,606 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2018-11-10 05:38:47,606 INFO L367 BasicCegarLoop]: Found error trace [2018-11-10 05:38:47,607 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-10 05:38:47,607 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-10 05:38:47,607 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-10 05:38:47,607 INFO L82 PathProgramCache]: Analyzing trace with hash 267373412, now seen corresponding path program 1 times [2018-11-10 05:38:47,607 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-10 05:38:47,607 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-10 05:38:47,608 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 05:38:47,608 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-10 05:38:47,608 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 05:38:47,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-10 05:38:47,662 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-10 05:38:47,662 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-10 05:38:47,662 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-11-10 05:38:47,663 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-11-10 05:38:47,663 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-11-10 05:38:47,663 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-11-10 05:38:47,663 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand 5 states. [2018-11-10 05:38:47,765 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-10 05:38:47,765 INFO L93 Difference]: Finished difference Result 74 states and 79 transitions. [2018-11-10 05:38:47,766 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-11-10 05:38:47,766 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 30 [2018-11-10 05:38:47,766 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-10 05:38:47,767 INFO L225 Difference]: With dead ends: 74 [2018-11-10 05:38:47,767 INFO L226 Difference]: Without dead ends: 50 [2018-11-10 05:38:47,768 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2018-11-10 05:38:47,768 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2018-11-10 05:38:47,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 40. [2018-11-10 05:38:47,775 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2018-11-10 05:38:47,775 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2018-11-10 05:38:47,776 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 30 [2018-11-10 05:38:47,776 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-10 05:38:47,776 INFO L481 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2018-11-10 05:38:47,776 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-11-10 05:38:47,776 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2018-11-10 05:38:47,777 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-11-10 05:38:47,777 INFO L367 BasicCegarLoop]: Found error trace [2018-11-10 05:38:47,777 INFO L375 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-10 05:38:47,777 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-10 05:38:47,777 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-10 05:38:47,777 INFO L82 PathProgramCache]: Analyzing trace with hash -190039143, now seen corresponding path program 1 times [2018-11-10 05:38:47,777 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-10 05:38:47,778 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-10 05:38:47,778 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 05:38:47,778 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-10 05:38:47,779 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 05:38:47,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-10 05:38:48,187 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-11-10 05:38:48,187 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-10 05:38:48,187 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_acef6e98-d694-45cd-889c-4696b3b735b7/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 [2018-11-10 05:38:48,204 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-10 05:38:48,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-10 05:38:48,229 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-10 05:38:48,258 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2018-11-10 05:38:48,259 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2018-11-10 05:38:48,263 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-11-10 05:38:48,264 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:10, output treesize:9 [2018-11-10 05:38:48,272 INFO L700 Elim1Store]: detected not equals via solver [2018-11-10 05:38:48,273 INFO L700 Elim1Store]: detected not equals via solver [2018-11-10 05:38:48,274 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 4 [2018-11-10 05:38:48,274 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2018-11-10 05:38:48,278 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-11-10 05:38:48,278 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:17, output treesize:11 [2018-11-10 05:38:48,431 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 17 [2018-11-10 05:38:48,434 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 11 [2018-11-10 05:38:48,434 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-11-10 05:38:48,437 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-11-10 05:38:48,443 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-11-10 05:38:48,443 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:32, output treesize:28 [2018-11-10 05:38:48,493 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2018-11-10 05:38:48,495 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 5 [2018-11-10 05:38:48,495 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-11-10 05:38:48,504 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2018-11-10 05:38:48,505 INFO L267 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2018-11-10 05:38:48,506 INFO L267 ElimStorePlain]: Start of recursive call 2: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-11-10 05:38:48,510 INFO L267 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-11-10 05:38:48,511 INFO L202 ElimStorePlain]: Needed 4 recursive calls to eliminate 3 variables, input treesize:30, output treesize:3 [2018-11-10 05:38:48,528 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-10 05:38:48,548 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-10 05:38:48,548 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 23 [2018-11-10 05:38:48,549 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-11-10 05:38:48,549 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-11-10 05:38:48,550 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=436, Unknown=0, NotChecked=0, Total=506 [2018-11-10 05:38:48,550 INFO L87 Difference]: Start difference. First operand 40 states and 42 transitions. Second operand 23 states. [2018-11-10 05:38:49,454 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-10 05:38:49,454 INFO L93 Difference]: Finished difference Result 125 states and 136 transitions. [2018-11-10 05:38:49,454 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-11-10 05:38:49,454 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 35 [2018-11-10 05:38:49,455 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-10 05:38:49,456 INFO L225 Difference]: With dead ends: 125 [2018-11-10 05:38:49,456 INFO L226 Difference]: Without dead ends: 123 [2018-11-10 05:38:49,457 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 24 SyntacticMatches, 5 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 452 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=416, Invalid=1654, Unknown=0, NotChecked=0, Total=2070 [2018-11-10 05:38:49,457 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2018-11-10 05:38:49,464 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 56. [2018-11-10 05:38:49,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2018-11-10 05:38:49,465 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 59 transitions. [2018-11-10 05:38:49,465 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 59 transitions. Word has length 35 [2018-11-10 05:38:49,465 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-10 05:38:49,465 INFO L481 AbstractCegarLoop]: Abstraction has 56 states and 59 transitions. [2018-11-10 05:38:49,465 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-11-10 05:38:49,465 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 59 transitions. [2018-11-10 05:38:49,466 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-11-10 05:38:49,466 INFO L367 BasicCegarLoop]: Found error trace [2018-11-10 05:38:49,466 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-10 05:38:49,467 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-10 05:38:49,467 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-10 05:38:49,467 INFO L82 PathProgramCache]: Analyzing trace with hash 206412561, now seen corresponding path program 2 times [2018-11-10 05:38:49,467 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-10 05:38:49,467 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-10 05:38:49,468 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 05:38:49,468 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-10 05:38:49,468 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 05:38:49,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-10 05:38:49,502 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 10 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-10 05:38:49,502 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-10 05:38:49,502 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_acef6e98-d694-45cd-889c-4696b3b735b7/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 [2018-11-10 05:38:49,512 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-11-10 05:38:49,527 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-11-10 05:38:49,528 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-10 05:38:49,529 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-10 05:38:49,534 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 10 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-10 05:38:49,553 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-10 05:38:49,554 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 7 [2018-11-10 05:38:49,554 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-11-10 05:38:49,554 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-11-10 05:38:49,554 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2018-11-10 05:38:49,554 INFO L87 Difference]: Start difference. First operand 56 states and 59 transitions. Second operand 7 states. [2018-11-10 05:38:49,623 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-10 05:38:49,624 INFO L93 Difference]: Finished difference Result 123 states and 133 transitions. [2018-11-10 05:38:49,624 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-11-10 05:38:49,624 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 41 [2018-11-10 05:38:49,624 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-10 05:38:49,626 INFO L225 Difference]: With dead ends: 123 [2018-11-10 05:38:49,626 INFO L226 Difference]: Without dead ends: 103 [2018-11-10 05:38:49,626 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=42, Invalid=68, Unknown=0, NotChecked=0, Total=110 [2018-11-10 05:38:49,626 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2018-11-10 05:38:49,633 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 71. [2018-11-10 05:38:49,633 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2018-11-10 05:38:49,634 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 75 transitions. [2018-11-10 05:38:49,634 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 75 transitions. Word has length 41 [2018-11-10 05:38:49,635 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-10 05:38:49,635 INFO L481 AbstractCegarLoop]: Abstraction has 71 states and 75 transitions. [2018-11-10 05:38:49,635 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-11-10 05:38:49,635 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 75 transitions. [2018-11-10 05:38:49,635 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-11-10 05:38:49,636 INFO L367 BasicCegarLoop]: Found error trace [2018-11-10 05:38:49,636 INFO L375 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-10 05:38:49,636 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-10 05:38:49,636 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-10 05:38:49,636 INFO L82 PathProgramCache]: Analyzing trace with hash 964997654, now seen corresponding path program 1 times [2018-11-10 05:38:49,636 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-10 05:38:49,636 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-10 05:38:49,637 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 05:38:49,637 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-10 05:38:49,637 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 05:38:49,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-10 05:38:49,674 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-11-10 05:38:49,674 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-10 05:38:49,674 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_acef6e98-d694-45cd-889c-4696b3b735b7/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 [2018-11-10 05:38:49,679 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-10 05:38:49,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-10 05:38:49,692 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-10 05:38:49,742 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-11-10 05:38:49,757 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-10 05:38:49,758 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 11 [2018-11-10 05:38:49,758 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-11-10 05:38:49,758 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-11-10 05:38:49,758 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=73, Unknown=0, NotChecked=0, Total=110 [2018-11-10 05:38:49,758 INFO L87 Difference]: Start difference. First operand 71 states and 75 transitions. Second operand 11 states. [2018-11-10 05:38:49,848 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-10 05:38:49,848 INFO L93 Difference]: Finished difference Result 109 states and 115 transitions. [2018-11-10 05:38:49,849 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-11-10 05:38:49,849 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 46 [2018-11-10 05:38:49,849 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-10 05:38:49,849 INFO L225 Difference]: With dead ends: 109 [2018-11-10 05:38:49,849 INFO L226 Difference]: Without dead ends: 72 [2018-11-10 05:38:49,850 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=70, Invalid=140, Unknown=0, NotChecked=0, Total=210 [2018-11-10 05:38:49,850 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2018-11-10 05:38:49,854 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 51. [2018-11-10 05:38:49,855 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-11-10 05:38:49,855 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 53 transitions. [2018-11-10 05:38:49,855 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 53 transitions. Word has length 46 [2018-11-10 05:38:49,855 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-10 05:38:49,856 INFO L481 AbstractCegarLoop]: Abstraction has 51 states and 53 transitions. [2018-11-10 05:38:49,856 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-11-10 05:38:49,856 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 53 transitions. [2018-11-10 05:38:49,856 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-11-10 05:38:49,856 INFO L367 BasicCegarLoop]: Found error trace [2018-11-10 05:38:49,857 INFO L375 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-10 05:38:49,857 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-10 05:38:49,857 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-10 05:38:49,857 INFO L82 PathProgramCache]: Analyzing trace with hash 1781688252, now seen corresponding path program 3 times [2018-11-10 05:38:49,857 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-10 05:38:49,857 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-10 05:38:49,858 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 05:38:49,858 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-10 05:38:49,858 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 05:38:49,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-10 05:38:50,227 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 19 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-10 05:38:50,228 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-10 05:38:50,228 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_acef6e98-d694-45cd-889c-4696b3b735b7/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 [2018-11-10 05:38:50,233 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-10 05:38:50,247 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-11-10 05:38:50,247 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-10 05:38:50,250 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-10 05:38:50,253 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2018-11-10 05:38:50,253 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2018-11-10 05:38:50,256 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-11-10 05:38:50,256 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:10, output treesize:9 [2018-11-10 05:38:50,261 INFO L700 Elim1Store]: detected not equals via solver [2018-11-10 05:38:50,261 INFO L700 Elim1Store]: detected not equals via solver [2018-11-10 05:38:50,262 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 4 [2018-11-10 05:38:50,262 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2018-11-10 05:38:50,274 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-11-10 05:38:50,274 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:17, output treesize:11 [2018-11-10 05:38:50,300 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 10 [2018-11-10 05:38:50,302 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 9 [2018-11-10 05:38:50,302 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-11-10 05:38:50,304 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-11-10 05:38:50,311 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-11-10 05:38:50,311 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:32, output treesize:19 [2018-11-10 05:38:50,405 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 19 [2018-11-10 05:38:50,407 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 13 [2018-11-10 05:38:50,407 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-11-10 05:38:50,410 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-11-10 05:38:50,417 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-11-10 05:38:50,417 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:36, output treesize:32 [2018-11-10 05:38:50,516 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2018-11-10 05:38:50,519 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 5 [2018-11-10 05:38:50,519 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-11-10 05:38:50,523 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2018-11-10 05:38:50,524 INFO L267 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2018-11-10 05:38:50,525 INFO L267 ElimStorePlain]: Start of recursive call 2: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-11-10 05:38:50,527 INFO L267 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-11-10 05:38:50,527 INFO L202 ElimStorePlain]: Needed 4 recursive calls to eliminate 3 variables, input treesize:30, output treesize:3 [2018-11-10 05:38:50,560 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-11-10 05:38:50,576 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-10 05:38:50,577 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 17] total 30 [2018-11-10 05:38:50,577 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-11-10 05:38:50,577 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-11-10 05:38:50,577 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=761, Unknown=0, NotChecked=0, Total=870 [2018-11-10 05:38:50,578 INFO L87 Difference]: Start difference. First operand 51 states and 53 transitions. Second operand 30 states. [2018-11-10 05:38:51,290 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-10 05:38:51,290 INFO L93 Difference]: Finished difference Result 87 states and 92 transitions. [2018-11-10 05:38:51,290 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-11-10 05:38:51,290 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 46 [2018-11-10 05:38:51,291 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-10 05:38:51,291 INFO L225 Difference]: With dead ends: 87 [2018-11-10 05:38:51,291 INFO L226 Difference]: Without dead ends: 85 [2018-11-10 05:38:51,292 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 33 SyntacticMatches, 4 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 634 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=354, Invalid=2096, Unknown=0, NotChecked=0, Total=2450 [2018-11-10 05:38:51,292 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2018-11-10 05:38:51,299 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 67. [2018-11-10 05:38:51,299 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2018-11-10 05:38:51,300 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 70 transitions. [2018-11-10 05:38:51,300 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 70 transitions. Word has length 46 [2018-11-10 05:38:51,300 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-10 05:38:51,300 INFO L481 AbstractCegarLoop]: Abstraction has 67 states and 70 transitions. [2018-11-10 05:38:51,300 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-11-10 05:38:51,300 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 70 transitions. [2018-11-10 05:38:51,301 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2018-11-10 05:38:51,301 INFO L367 BasicCegarLoop]: Found error trace [2018-11-10 05:38:51,301 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 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] [2018-11-10 05:38:51,301 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-10 05:38:51,302 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-10 05:38:51,302 INFO L82 PathProgramCache]: Analyzing trace with hash -1828921100, now seen corresponding path program 4 times [2018-11-10 05:38:51,302 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-10 05:38:51,302 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-10 05:38:51,303 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 05:38:51,303 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-10 05:38:51,303 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 05:38:51,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-10 05:38:51,353 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 24 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-10 05:38:51,353 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-10 05:38:51,353 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_acef6e98-d694-45cd-889c-4696b3b735b7/bin-2019/uautomizer/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-10 05:38:51,364 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-10 05:38:51,374 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-10 05:38:51,375 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-10 05:38:51,377 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-10 05:38:51,383 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 24 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-10 05:38:51,400 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-10 05:38:51,401 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 8 [2018-11-10 05:38:51,401 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-11-10 05:38:51,401 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-11-10 05:38:51,401 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-11-10 05:38:51,401 INFO L87 Difference]: Start difference. First operand 67 states and 70 transitions. Second operand 8 states. [2018-11-10 05:38:51,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-10 05:38:51,496 INFO L93 Difference]: Finished difference Result 149 states and 160 transitions. [2018-11-10 05:38:51,496 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-11-10 05:38:51,496 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 52 [2018-11-10 05:38:51,496 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-10 05:38:51,497 INFO L225 Difference]: With dead ends: 149 [2018-11-10 05:38:51,497 INFO L226 Difference]: Without dead ends: 129 [2018-11-10 05:38:51,498 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=60, Invalid=96, Unknown=0, NotChecked=0, Total=156 [2018-11-10 05:38:51,498 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2018-11-10 05:38:51,507 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 88. [2018-11-10 05:38:51,507 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2018-11-10 05:38:51,508 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 92 transitions. [2018-11-10 05:38:51,508 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 92 transitions. Word has length 52 [2018-11-10 05:38:51,508 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-10 05:38:51,508 INFO L481 AbstractCegarLoop]: Abstraction has 88 states and 92 transitions. [2018-11-10 05:38:51,508 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-11-10 05:38:51,508 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 92 transitions. [2018-11-10 05:38:51,509 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2018-11-10 05:38:51,509 INFO L367 BasicCegarLoop]: Found error trace [2018-11-10 05:38:51,509 INFO L375 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-10 05:38:51,509 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-10 05:38:51,509 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-10 05:38:51,510 INFO L82 PathProgramCache]: Analyzing trace with hash -906714605, now seen corresponding path program 2 times [2018-11-10 05:38:51,510 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-10 05:38:51,510 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-10 05:38:51,510 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 05:38:51,510 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-10 05:38:51,510 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 05:38:51,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-11-10 05:38:51,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-11-10 05:38:51,560 INFO L442 BasicCegarLoop]: Counterexample might be feasible [2018-11-10 05:38:51,593 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 10.11 05:38:51 BoogieIcfgContainer [2018-11-10 05:38:51,593 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-11-10 05:38:51,594 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2018-11-10 05:38:51,594 INFO L271 PluginConnector]: Initializing Witness Printer... [2018-11-10 05:38:51,594 INFO L276 PluginConnector]: Witness Printer initialized [2018-11-10 05:38:51,594 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 10.11 05:38:47" (3/4) ... [2018-11-10 05:38:51,596 INFO L138 WitnessPrinter]: Generating witness for reachability counterexample [2018-11-10 05:38:51,639 INFO L145 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/working_dir_acef6e98-d694-45cd-889c-4696b3b735b7/bin-2019/uautomizer/witness.graphml [2018-11-10 05:38:51,639 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2018-11-10 05:38:51,640 INFO L168 Benchmark]: Toolchain (without parser) took 4906.44 ms. Allocated memory was 1.0 GB in the beginning and 1.4 GB in the end (delta: 335.5 MB). Free memory was 960.3 MB in the beginning and 1.1 GB in the end (delta: -140.5 MB). Peak memory consumption was 195.1 MB. Max. memory is 11.5 GB. [2018-11-10 05:38:51,641 INFO L168 Benchmark]: CDTParser took 0.10 ms. Allocated memory is still 1.0 GB. Free memory is still 985.6 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-11-10 05:38:51,641 INFO L168 Benchmark]: CACSL2BoogieTranslator took 158.19 ms. Allocated memory is still 1.0 GB. Free memory was 960.3 MB in the beginning and 949.6 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. [2018-11-10 05:38:51,641 INFO L168 Benchmark]: Boogie Preprocessor took 23.04 ms. Allocated memory is still 1.0 GB. Free memory was 949.6 MB in the beginning and 946.9 MB in the end (delta: 2.7 MB). Peak memory consumption was 2.7 MB. Max. memory is 11.5 GB. [2018-11-10 05:38:51,642 INFO L168 Benchmark]: RCFGBuilder took 254.33 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 158.9 MB). Free memory was 946.9 MB in the beginning and 1.1 GB in the end (delta: -194.2 MB). Peak memory consumption was 19.9 MB. Max. memory is 11.5 GB. [2018-11-10 05:38:51,642 INFO L168 Benchmark]: TraceAbstraction took 4422.31 ms. Allocated memory was 1.2 GB in the beginning and 1.4 GB in the end (delta: 176.7 MB). Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 32.9 MB). Peak memory consumption was 209.6 MB. Max. memory is 11.5 GB. [2018-11-10 05:38:51,642 INFO L168 Benchmark]: Witness Printer took 45.57 ms. Allocated memory is still 1.4 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 7.4 MB). Peak memory consumption was 7.4 MB. Max. memory is 11.5 GB. [2018-11-10 05:38:51,644 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.10 ms. Allocated memory is still 1.0 GB. Free memory is still 985.6 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 158.19 ms. Allocated memory is still 1.0 GB. Free memory was 960.3 MB in the beginning and 949.6 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. * Boogie Preprocessor took 23.04 ms. Allocated memory is still 1.0 GB. Free memory was 949.6 MB in the beginning and 946.9 MB in the end (delta: 2.7 MB). Peak memory consumption was 2.7 MB. Max. memory is 11.5 GB. * RCFGBuilder took 254.33 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 158.9 MB). Free memory was 946.9 MB in the beginning and 1.1 GB in the end (delta: -194.2 MB). Peak memory consumption was 19.9 MB. Max. memory is 11.5 GB. * TraceAbstraction took 4422.31 ms. Allocated memory was 1.2 GB in the beginning and 1.4 GB in the end (delta: 176.7 MB). Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 32.9 MB). Peak memory consumption was 209.6 MB. Max. memory is 11.5 GB. * Witness Printer took 45.57 ms. Allocated memory is still 1.4 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 7.4 MB). Peak memory consumption was 7.4 MB. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 5]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L13] int MAX = __VERIFIER_nondet_uint(); [L14] FCALL char str1[MAX], str2[MAX]; VAL [MAX=2, str1={4:0}, str2={6:0}] [L15] int cont, i, j; [L16] cont = 0 [L18] i=0 VAL [cont=0, i=0, MAX=2, str1={4:0}, str2={6:0}] [L18] COND TRUE i= 0 VAL [cont=0, i=1, j=0, MAX=2, str1={4:0}, str2={6:0}] [L26] EXPR, FCALL str1[0] VAL [cont=0, i=1, j=0, MAX=2, str1={4:0}, str1[0]=1, str2={6:0}] [L26] FCALL str2[j] = str1[0] VAL [cont=0, i=1, j=0, MAX=2, str1={4:0}, str1[0]=1, str2={6:0}] [L27] j++ VAL [cont=0, i=1, j=1, MAX=2, str1={4:0}, str2={6:0}] [L25] i-- VAL [cont=0, i=0, j=1, MAX=2, str1={4:0}, str2={6:0}] [L25] COND TRUE i >= 0 VAL [cont=0, i=0, j=1, MAX=2, str1={4:0}, str2={6:0}] [L26] EXPR, FCALL str1[0] VAL [cont=0, i=0, j=1, MAX=2, str1={4:0}, str1[0]=1, str2={6:0}] [L26] FCALL str2[j] = str1[0] VAL [cont=0, i=0, j=1, MAX=2, str1={4:0}, str1[0]=1, str2={6:0}] [L27] j++ VAL [cont=0, i=0, j=2, MAX=2, str1={4:0}, str2={6:0}] [L25] i-- VAL [cont=0, i=-1, j=2, MAX=2, str1={4:0}, str2={6:0}] [L25] COND FALSE !(i >= 0) VAL [cont=0, i=-1, j=2, MAX=2, str1={4:0}, str2={6:0}] [L30] j = MAX-1 [L31] i=0 VAL [cont=0, i=0, j=1, MAX=2, str1={4:0}, str2={6:0}] [L31] COND TRUE i