/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic DAGSIZE --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/id_i10_o10-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 21:36:55,054 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 21:36:55,057 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 21:36:55,077 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 21:36:55,077 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 21:36:55,080 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 21:36:55,082 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 21:36:55,096 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 21:36:55,098 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 21:36:55,099 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 21:36:55,102 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 21:36:55,103 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 21:36:55,104 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 21:36:55,107 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 21:36:55,110 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 21:36:55,112 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 21:36:55,114 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 21:36:55,115 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 21:36:55,116 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 21:36:55,118 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 21:36:55,120 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 21:36:55,121 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 21:36:55,122 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 21:36:55,122 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 21:36:55,125 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-07-20 21:36:55,125 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-07-20 21:36:55,125 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-07-20 21:36:55,126 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-07-20 21:36:55,127 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-07-20 21:36:55,128 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-07-20 21:36:55,128 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-07-20 21:36:55,129 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-07-20 21:36:55,129 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-07-20 21:36:55,130 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-07-20 21:36:55,131 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-07-20 21:36:55,131 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-07-20 21:36:55,132 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-07-20 21:36:55,132 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-07-20 21:36:55,132 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 21:36:55,133 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 21:36:55,134 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 21:36:55,135 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 21:36:55,149 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 21:36:55,149 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 21:36:55,151 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 21:36:55,151 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 21:36:55,151 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 21:36:55,151 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 21:36:55,152 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 21:36:55,152 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 21:36:55,152 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 21:36:55,152 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 21:36:55,152 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 21:36:55,153 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 21:36:55,153 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 21:36:55,153 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 21:36:55,153 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 21:36:55,153 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 21:36:55,154 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 21:36:55,154 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 21:36:55,154 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 21:36:55,154 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 21:36:55,154 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 21:36:55,155 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 21:36:55,155 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 21:36:55,155 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 21:36:55,155 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 21:36:55,156 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 21:36:55,156 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:55,156 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 21:36:55,156 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 21:36:55,156 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> DAGSIZE Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 21:36:55,459 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 21:36:55,473 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 21:36:55,479 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 21:36:55,481 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 21:36:55,481 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 21:36:55,482 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id_i10_o10-2.c [2020-07-20 21:36:55,563 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c81186902/29b0d9b7d1494ea599725612fb6b5847/FLAG99c931982 [2020-07-20 21:36:56,046 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 21:36:56,047 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/id_i10_o10-2.c [2020-07-20 21:36:56,055 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c81186902/29b0d9b7d1494ea599725612fb6b5847/FLAG99c931982 [2020-07-20 21:36:56,392 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c81186902/29b0d9b7d1494ea599725612fb6b5847 [2020-07-20 21:36:56,401 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 21:36:56,403 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 21:36:56,404 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 21:36:56,404 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 21:36:56,408 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 21:36:56,409 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 09:36:56" (1/1) ... [2020-07-20 21:36:56,412 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3c5380d7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:36:56, skipping insertion in model container [2020-07-20 21:36:56,412 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 09:36:56" (1/1) ... [2020-07-20 21:36:56,419 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 21:36:56,431 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 21:36:56,593 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 21:36:56,598 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 21:36:56,613 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 21:36:56,627 INFO L208 MainTranslator]: Completed translation [2020-07-20 21:36:56,628 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:36:56 WrapperNode [2020-07-20 21:36:56,628 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 21:36:56,629 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 21:36:56,629 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 21:36:56,629 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 21:36:56,642 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:36:56" (1/1) ... [2020-07-20 21:36:56,642 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:36:56" (1/1) ... [2020-07-20 21:36:56,647 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:36:56" (1/1) ... [2020-07-20 21:36:56,648 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:36:56" (1/1) ... [2020-07-20 21:36:56,651 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:36:56" (1/1) ... [2020-07-20 21:36:56,653 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:36:56" (1/1) ... [2020-07-20 21:36:56,654 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:36:56" (1/1) ... [2020-07-20 21:36:56,655 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 21:36:56,656 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 21:36:56,656 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 21:36:56,656 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 21:36:56,657 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:36:56" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 21:36:56,800 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 21:36:56,800 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 21:36:56,800 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-07-20 21:36:56,801 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 21:36:56,801 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 21:36:56,801 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 21:36:56,801 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-07-20 21:36:56,801 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 21:36:56,801 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 21:36:56,802 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 21:36:56,968 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 21:36:56,968 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 21:36:56,972 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 09:36:56 BoogieIcfgContainer [2020-07-20 21:36:56,973 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 21:36:56,974 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 21:36:56,974 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 21:36:56,977 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 21:36:56,977 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 09:36:56" (1/3) ... [2020-07-20 21:36:56,978 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3e87d86c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 09:36:56, skipping insertion in model container [2020-07-20 21:36:56,978 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:36:56" (2/3) ... [2020-07-20 21:36:56,979 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3e87d86c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 09:36:56, skipping insertion in model container [2020-07-20 21:36:56,979 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 09:36:56" (3/3) ... [2020-07-20 21:36:56,981 INFO L109 eAbstractionObserver]: Analyzing ICFG id_i10_o10-2.c [2020-07-20 21:36:56,991 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 21:36:56,998 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 21:36:57,013 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 21:36:57,039 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 21:36:57,039 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 21:36:57,039 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 21:36:57,040 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 21:36:57,040 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 21:36:57,040 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 21:36:57,040 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 21:36:57,040 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 21:36:57,060 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-07-20 21:36:57,067 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 21:36:57,067 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:57,069 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:57,070 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:57,076 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:57,077 INFO L82 PathProgramCache]: Analyzing trace with hash -872342019, now seen corresponding path program 1 times [2020-07-20 21:36:57,086 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:57,086 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2107229687] [2020-07-20 21:36:57,087 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:57,152 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 21:36:57,153 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:57,155 INFO L263 TraceCheckSpWp]: Trace formula consists of 24 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 21:36:57,162 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:57,261 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 21:36:57,261 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:36:57,262 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2107229687] [2020-07-20 21:36:57,263 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:36:57,263 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 21:36:57,264 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1659553419] [2020-07-20 21:36:57,269 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 21:36:57,270 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:57,284 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 21:36:57,285 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 21:36:57,287 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2020-07-20 21:36:57,381 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:57,381 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2020-07-20 21:36:57,382 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 21:36:57,384 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-20 21:36:57,384 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:57,394 INFO L225 Difference]: With dead ends: 30 [2020-07-20 21:36:57,394 INFO L226 Difference]: Without dead ends: 18 [2020-07-20 21:36:57,407 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 21:36:57,425 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-07-20 21:36:57,448 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-07-20 21:36:57,449 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-07-20 21:36:57,450 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2020-07-20 21:36:57,452 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2020-07-20 21:36:57,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:57,452 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2020-07-20 21:36:57,453 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 21:36:57,453 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2020-07-20 21:36:57,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-20 21:36:57,455 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:57,455 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:57,661 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:57,661 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:57,662 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:57,662 INFO L82 PathProgramCache]: Analyzing trace with hash -953570577, now seen corresponding path program 1 times [2020-07-20 21:36:57,663 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:57,664 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1752807713] [2020-07-20 21:36:57,664 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:57,694 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 21:36:57,694 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:57,695 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 21:36:57,698 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:57,758 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-20 21:36:57,758 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:57,937 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:57,942 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:57,983 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 21:36:57,984 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1752807713] [2020-07-20 21:36:57,984 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:57,984 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-20 21:36:57,985 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [78438498] [2020-07-20 21:36:57,986 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 21:36:57,987 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:57,987 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 21:36:57,987 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-20 21:36:57,988 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 9 states. [2020-07-20 21:36:58,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:58,059 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2020-07-20 21:36:58,060 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 21:36:58,060 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2020-07-20 21:36:58,061 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:58,062 INFO L225 Difference]: With dead ends: 25 [2020-07-20 21:36:58,062 INFO L226 Difference]: Without dead ends: 21 [2020-07-20 21:36:58,063 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 26 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-20 21:36:58,064 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-20 21:36:58,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-20 21:36:58,070 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-20 21:36:58,071 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-07-20 21:36:58,071 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 19 [2020-07-20 21:36:58,072 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:58,072 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-07-20 21:36:58,072 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 21:36:58,072 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-07-20 21:36:58,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-20 21:36:58,073 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:58,074 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:58,286 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:58,287 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:58,287 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:58,288 INFO L82 PathProgramCache]: Analyzing trace with hash 397359997, now seen corresponding path program 2 times [2020-07-20 21:36:58,288 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:58,288 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1502616132] [2020-07-20 21:36:58,289 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:58,317 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 21:36:58,317 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:58,318 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 21:36:58,321 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:58,376 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-07-20 21:36:58,376 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:58,616 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:58,618 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:58,670 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:58,671 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:58,702 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-20 21:36:58,703 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1502616132] [2020-07-20 21:36:58,703 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:58,703 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-20 21:36:58,704 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1111769309] [2020-07-20 21:36:58,704 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 21:36:58,705 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:58,705 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 21:36:58,705 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-20 21:36:58,705 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 11 states. [2020-07-20 21:36:58,767 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:58,768 INFO L93 Difference]: Finished difference Result 28 states and 29 transitions. [2020-07-20 21:36:58,768 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 21:36:58,769 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 25 [2020-07-20 21:36:58,769 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:58,770 INFO L225 Difference]: With dead ends: 28 [2020-07-20 21:36:58,770 INFO L226 Difference]: Without dead ends: 24 [2020-07-20 21:36:58,771 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 34 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-20 21:36:58,772 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-07-20 21:36:58,776 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-07-20 21:36:58,777 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-07-20 21:36:58,778 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2020-07-20 21:36:58,778 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 25 [2020-07-20 21:36:58,779 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:58,779 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2020-07-20 21:36:58,779 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 21:36:58,779 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2020-07-20 21:36:58,780 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-20 21:36:58,781 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:58,781 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:58,994 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:58,995 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:58,995 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:58,996 INFO L82 PathProgramCache]: Analyzing trace with hash 1198310127, now seen corresponding path program 3 times [2020-07-20 21:36:58,996 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:58,997 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1676553439] [2020-07-20 21:36:58,997 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:59,039 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:59,040 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:59,041 INFO L263 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 21:36:59,044 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:59,092 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-07-20 21:36:59,093 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:59,433 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:59,540 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:59,580 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:59,628 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-20 21:36:59,629 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1676553439] [2020-07-20 21:36:59,629 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:59,629 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-20 21:36:59,630 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1515751697] [2020-07-20 21:36:59,630 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 21:36:59,631 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:59,631 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 21:36:59,631 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-20 21:36:59,631 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 13 states. [2020-07-20 21:36:59,727 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:59,728 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2020-07-20 21:36:59,729 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 21:36:59,729 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 31 [2020-07-20 21:36:59,729 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:59,730 INFO L225 Difference]: With dead ends: 31 [2020-07-20 21:36:59,730 INFO L226 Difference]: Without dead ends: 27 [2020-07-20 21:36:59,731 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 42 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-20 21:36:59,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-07-20 21:36:59,736 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-07-20 21:36:59,736 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-07-20 21:36:59,737 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2020-07-20 21:36:59,738 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 31 [2020-07-20 21:36:59,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:59,738 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2020-07-20 21:36:59,738 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 21:36:59,738 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2020-07-20 21:36:59,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-07-20 21:36:59,740 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:59,740 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:59,954 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:59,954 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:59,955 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:59,955 INFO L82 PathProgramCache]: Analyzing trace with hash 1080764669, now seen corresponding path program 4 times [2020-07-20 21:36:59,956 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:59,956 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [427770205] [2020-07-20 21:36:59,957 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:59,991 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:59,991 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:59,992 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 21:36:59,994 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:37:00,057 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2020-07-20 21:37:00,058 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:37:00,593 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:00,594 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:00,742 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:00,744 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:00,829 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:00,830 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:00,874 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:00,875 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:00,933 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-07-20 21:37:00,934 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [427770205] [2020-07-20 21:37:00,935 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:37:00,935 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-20 21:37:00,936 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [959747537] [2020-07-20 21:37:00,936 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 21:37:00,936 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:37:00,937 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 21:37:00,940 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-20 21:37:00,941 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 15 states. [2020-07-20 21:37:01,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:37:01,050 INFO L93 Difference]: Finished difference Result 34 states and 35 transitions. [2020-07-20 21:37:01,056 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 21:37:01,057 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 37 [2020-07-20 21:37:01,058 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:37:01,058 INFO L225 Difference]: With dead ends: 34 [2020-07-20 21:37:01,058 INFO L226 Difference]: Without dead ends: 30 [2020-07-20 21:37:01,061 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 50 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2020-07-20 21:37:01,062 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-20 21:37:01,066 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-07-20 21:37:01,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 21:37:01,068 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2020-07-20 21:37:01,068 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 37 [2020-07-20 21:37:01,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:37:01,069 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2020-07-20 21:37:01,069 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 21:37:01,069 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2020-07-20 21:37:01,070 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-07-20 21:37:01,070 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:37:01,070 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:37:01,277 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:37:01,277 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:37:01,278 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:37:01,278 INFO L82 PathProgramCache]: Analyzing trace with hash -1752970513, now seen corresponding path program 5 times [2020-07-20 21:37:01,279 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:37:01,280 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1007130961] [2020-07-20 21:37:01,280 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:37:01,334 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:37:01,335 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:37:01,335 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 21:37:01,338 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:37:01,421 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-20 21:37:01,421 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:37:02,176 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:02,378 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:02,379 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:02,548 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:02,550 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:02,643 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:02,644 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:02,710 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:02,711 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:02,763 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 65 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-07-20 21:37:02,764 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1007130961] [2020-07-20 21:37:02,764 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:37:02,764 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-20 21:37:02,765 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [767683763] [2020-07-20 21:37:02,765 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 21:37:02,765 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:37:02,766 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 21:37:02,766 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-20 21:37:02,766 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand 17 states. [2020-07-20 21:37:02,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:37:02,905 INFO L93 Difference]: Finished difference Result 37 states and 38 transitions. [2020-07-20 21:37:02,906 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 21:37:02,906 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 43 [2020-07-20 21:37:02,907 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:37:02,908 INFO L225 Difference]: With dead ends: 37 [2020-07-20 21:37:02,908 INFO L226 Difference]: Without dead ends: 33 [2020-07-20 21:37:02,909 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 58 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2020-07-20 21:37:02,909 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-20 21:37:02,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-07-20 21:37:02,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-07-20 21:37:02,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2020-07-20 21:37:02,915 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 43 [2020-07-20 21:37:02,916 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:37:02,916 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2020-07-20 21:37:02,916 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 21:37:02,916 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2020-07-20 21:37:02,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-07-20 21:37:02,918 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:37:02,918 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:37:03,131 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:37:03,132 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:37:03,132 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:37:03,132 INFO L82 PathProgramCache]: Analyzing trace with hash -1590630787, now seen corresponding path program 6 times [2020-07-20 21:37:03,133 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:37:03,134 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [427033566] [2020-07-20 21:37:03,134 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:37:03,211 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:37:03,212 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:37:03,213 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 21:37:03,215 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:37:03,307 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2020-07-20 21:37:03,308 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:37:04,419 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:04,736 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:04,737 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:04,956 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:04,957 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:05,100 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:05,101 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:05,182 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:05,183 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:05,222 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:05,223 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:05,264 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 93 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-20 21:37:05,264 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [427033566] [2020-07-20 21:37:05,264 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:37:05,265 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-20 21:37:05,265 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [990280310] [2020-07-20 21:37:05,265 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 21:37:05,266 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:37:05,266 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 21:37:05,266 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-20 21:37:05,267 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 19 states. [2020-07-20 21:37:05,438 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:37:05,438 INFO L93 Difference]: Finished difference Result 40 states and 41 transitions. [2020-07-20 21:37:05,439 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 21:37:05,439 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 49 [2020-07-20 21:37:05,440 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:37:05,440 INFO L225 Difference]: With dead ends: 40 [2020-07-20 21:37:05,441 INFO L226 Difference]: Without dead ends: 36 [2020-07-20 21:37:05,442 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 66 SyntacticMatches, 14 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=211, Invalid=439, Unknown=0, NotChecked=0, Total=650 [2020-07-20 21:37:05,442 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-07-20 21:37:05,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-07-20 21:37:05,446 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-20 21:37:05,447 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2020-07-20 21:37:05,447 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 49 [2020-07-20 21:37:05,448 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:37:05,448 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2020-07-20 21:37:05,448 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 21:37:05,448 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2020-07-20 21:37:05,449 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-07-20 21:37:05,449 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:37:05,449 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:37:05,653 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:37:05,654 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:37:05,655 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:37:05,655 INFO L82 PathProgramCache]: Analyzing trace with hash 1532150511, now seen corresponding path program 7 times [2020-07-20 21:37:05,656 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:37:05,656 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1927188702] [2020-07-20 21:37:05,656 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:37:05,750 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:37:05,750 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:37:05,751 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 21:37:05,753 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:37:05,844 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2020-07-20 21:37:05,844 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:37:07,367 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:07,368 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:07,833 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:07,834 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:08,135 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:08,136 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:08,359 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:08,360 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:08,505 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:08,594 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:08,642 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:08,685 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2020-07-20 21:37:08,686 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1927188702] [2020-07-20 21:37:08,687 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:37:08,687 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-20 21:37:08,687 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1334466465] [2020-07-20 21:37:08,688 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 21:37:08,688 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:37:08,688 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 21:37:08,689 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-20 21:37:08,689 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand 21 states. [2020-07-20 21:37:08,887 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:37:08,887 INFO L93 Difference]: Finished difference Result 43 states and 44 transitions. [2020-07-20 21:37:08,888 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 21:37:08,888 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 55 [2020-07-20 21:37:08,888 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:37:08,889 INFO L225 Difference]: With dead ends: 43 [2020-07-20 21:37:08,889 INFO L226 Difference]: Without dead ends: 39 [2020-07-20 21:37:08,890 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 74 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2020-07-20 21:37:08,891 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-07-20 21:37:08,895 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-07-20 21:37:08,895 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-07-20 21:37:08,896 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2020-07-20 21:37:08,896 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 55 [2020-07-20 21:37:08,897 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:37:08,897 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2020-07-20 21:37:08,897 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 21:37:08,897 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2020-07-20 21:37:08,898 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-07-20 21:37:08,898 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:37:08,899 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:37:09,104 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:37:09,104 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:37:09,105 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:37:09,105 INFO L82 PathProgramCache]: Analyzing trace with hash 1140618237, now seen corresponding path program 8 times [2020-07-20 21:37:09,106 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:37:09,106 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [508761362] [2020-07-20 21:37:09,107 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:37:09,199 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:37:09,199 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:37:09,200 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 21:37:09,203 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:37:09,303 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2020-07-20 21:37:09,303 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:37:11,433 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:12,122 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:12,635 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:12,975 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:13,185 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:13,331 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:13,332 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:13,421 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:13,422 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:13,473 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:13,474 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:13,538 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 164 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2020-07-20 21:37:13,539 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [508761362] [2020-07-20 21:37:13,539 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:37:13,539 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-20 21:37:13,539 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [324472857] [2020-07-20 21:37:13,540 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 21:37:13,541 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:37:13,541 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 21:37:13,541 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-20 21:37:13,541 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 23 states. [2020-07-20 21:37:13,714 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:37:13,715 INFO L93 Difference]: Finished difference Result 46 states and 47 transitions. [2020-07-20 21:37:13,715 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 21:37:13,715 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 61 [2020-07-20 21:37:13,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:37:13,717 INFO L225 Difference]: With dead ends: 46 [2020-07-20 21:37:13,717 INFO L226 Difference]: Without dead ends: 42 [2020-07-20 21:37:13,720 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 82 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2020-07-20 21:37:13,721 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-20 21:37:13,731 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-07-20 21:37:13,731 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-07-20 21:37:13,732 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2020-07-20 21:37:13,732 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 61 [2020-07-20 21:37:13,733 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:37:13,733 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2020-07-20 21:37:13,733 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 21:37:13,733 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2020-07-20 21:37:13,734 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-07-20 21:37:13,734 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:37:13,734 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:37:13,938 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:37:13,940 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:37:13,940 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:37:13,940 INFO L82 PathProgramCache]: Analyzing trace with hash -1749177617, now seen corresponding path program 9 times [2020-07-20 21:37:13,941 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:37:13,941 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1248940716] [2020-07-20 21:37:13,942 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:37:14,072 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:37:14,073 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:37:14,074 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 21:37:14,076 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:37:14,205 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2020-07-20 21:37:14,206 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:37:16,904 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:16,905 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:17,858 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:17,859 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:18,562 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:18,563 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:19,075 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:19,076 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:19,407 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:19,408 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:19,621 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:19,767 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:19,855 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:19,911 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:19,912 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:37:19,959 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 207 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2020-07-20 21:37:19,960 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1248940716] [2020-07-20 21:37:19,960 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:37:19,960 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 24 [2020-07-20 21:37:19,961 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2080863224] [2020-07-20 21:37:19,961 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-20 21:37:19,961 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:37:19,962 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-20 21:37:19,962 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=397, Unknown=0, NotChecked=0, Total=552 [2020-07-20 21:37:19,962 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand 24 states. [2020-07-20 21:37:20,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:37:20,171 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2020-07-20 21:37:20,172 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 21:37:20,172 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 67 [2020-07-20 21:37:20,173 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:37:20,173 INFO L225 Difference]: With dead ends: 49 [2020-07-20 21:37:20,173 INFO L226 Difference]: Without dead ends: 45 [2020-07-20 21:37:20,179 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 90 SyntacticMatches, 21 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 261 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=385, Invalid=737, Unknown=0, NotChecked=0, Total=1122 [2020-07-20 21:37:20,179 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-07-20 21:37:20,185 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-07-20 21:37:20,186 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-07-20 21:37:20,186 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2020-07-20 21:37:20,187 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 67 [2020-07-20 21:37:20,187 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:37:20,187 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2020-07-20 21:37:20,187 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-20 21:37:20,187 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2020-07-20 21:37:20,189 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2020-07-20 21:37:20,189 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:37:20,189 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:37:20,407 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:37:20,408 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:37:20,408 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:37:20,409 INFO L82 PathProgramCache]: Analyzing trace with hash -1580609155, now seen corresponding path program 10 times [2020-07-20 21:37:20,409 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:37:20,410 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [626287730] [2020-07-20 21:37:20,410 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:37:20,595 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:37:20,595 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:37:20,597 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 47 conjunts are in the unsatisfiable core [2020-07-20 21:37:20,599 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:37:20,969 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2020-07-20 21:37:20,969 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:37:22,052 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2020-07-20 21:37:22,052 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [626287730] [2020-07-20 21:37:22,053 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:37:22,053 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 25 [2020-07-20 21:37:22,053 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [68430127] [2020-07-20 21:37:22,053 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 21:37:22,054 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:37:22,054 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 21:37:22,054 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=553, Unknown=0, NotChecked=0, Total=600 [2020-07-20 21:37:22,054 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand 25 states. [2020-07-20 21:37:22,326 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:37:22,327 INFO L93 Difference]: Finished difference Result 52 states and 53 transitions. [2020-07-20 21:37:22,327 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-07-20 21:37:22,327 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 73 [2020-07-20 21:37:22,328 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:37:22,329 INFO L225 Difference]: With dead ends: 52 [2020-07-20 21:37:22,329 INFO L226 Difference]: Without dead ends: 48 [2020-07-20 21:37:22,330 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 122 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=47, Invalid=553, Unknown=0, NotChecked=0, Total=600 [2020-07-20 21:37:22,331 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-20 21:37:22,338 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-07-20 21:37:22,339 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-07-20 21:37:22,340 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 49 transitions. [2020-07-20 21:37:22,341 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 49 transitions. Word has length 73 [2020-07-20 21:37:22,342 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:37:22,342 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 49 transitions. [2020-07-20 21:37:22,342 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 21:37:22,342 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 49 transitions. [2020-07-20 21:37:22,343 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2020-07-20 21:37:22,344 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:37:22,344 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:37:22,547 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:37:22,547 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:37:22,548 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:37:22,548 INFO L82 PathProgramCache]: Analyzing trace with hash -223837457, now seen corresponding path program 11 times [2020-07-20 21:37:22,548 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:37:22,549 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2022504735] [2020-07-20 21:37:22,549 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:37:22,753 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:37:22,753 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:37:22,755 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-20 21:37:22,756 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:37:22,921 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 187 proven. 0 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2020-07-20 21:37:22,921 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:37:22,921 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2022504735] [2020-07-20 21:37:22,922 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:37:22,922 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2020-07-20 21:37:22,922 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1319052049] [2020-07-20 21:37:22,923 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-20 21:37:22,923 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:37:22,923 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-20 21:37:22,923 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=145, Unknown=0, NotChecked=0, Total=240 [2020-07-20 21:37:22,924 INFO L87 Difference]: Start difference. First operand 48 states and 49 transitions. Second operand 16 states. [2020-07-20 21:37:23,172 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:37:23,173 INFO L93 Difference]: Finished difference Result 48 states and 49 transitions. [2020-07-20 21:37:23,173 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-20 21:37:23,174 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 79 [2020-07-20 21:37:23,174 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:37:23,174 INFO L225 Difference]: With dead ends: 48 [2020-07-20 21:37:23,174 INFO L226 Difference]: Without dead ends: 0 [2020-07-20 21:37:23,176 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=275, Invalid=481, Unknown=0, NotChecked=0, Total=756 [2020-07-20 21:37:23,176 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-20 21:37:23,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-20 21:37:23,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-20 21:37:23,176 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-20 21:37:23,177 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 79 [2020-07-20 21:37:23,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:37:23,177 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-20 21:37:23,177 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-20 21:37:23,177 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-20 21:37:23,177 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-20 21:37:23,378 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:37:23,381 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-20 21:37:23,454 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-20 21:37:23,455 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-20 21:37:23,455 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-20 21:37:23,455 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-20 21:37:23,455 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-20 21:37:23,455 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-20 21:37:23,456 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 13) no Hoare annotation was computed. [2020-07-20 21:37:23,456 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 9 15) the Hoare annotation is: true [2020-07-20 21:37:23,456 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 9 15) no Hoare annotation was computed. [2020-07-20 21:37:23,456 INFO L268 CegarLoopResult]: For program point L13(line 13) no Hoare annotation was computed. [2020-07-20 21:37:23,456 INFO L268 CegarLoopResult]: For program point L12(lines 12 14) no Hoare annotation was computed. [2020-07-20 21:37:23,457 INFO L264 CegarLoopResult]: At program point L11(line 11) the Hoare annotation is: (and (<= 10 main_~input~0) (<= main_~input~0 10)) [2020-07-20 21:37:23,457 INFO L268 CegarLoopResult]: For program point L11-1(line 11) no Hoare annotation was computed. [2020-07-20 21:37:23,457 INFO L268 CegarLoopResult]: For program point L12-2(lines 9 15) no Hoare annotation was computed. [2020-07-20 21:37:23,458 INFO L268 CegarLoopResult]: For program point idFINAL(lines 4 7) no Hoare annotation was computed. [2020-07-20 21:37:23,458 INFO L268 CegarLoopResult]: For program point idEXIT(lines 4 7) no Hoare annotation was computed. [2020-07-20 21:37:23,458 INFO L271 CegarLoopResult]: At program point idENTRY(lines 4 7) the Hoare annotation is: true [2020-07-20 21:37:23,458 INFO L264 CegarLoopResult]: At program point L6(line 6) the Hoare annotation is: (and (<= |id_#in~x| id_~x) (<= id_~x |id_#in~x|)) [2020-07-20 21:37:23,458 INFO L268 CegarLoopResult]: For program point L5(line 5) no Hoare annotation was computed. [2020-07-20 21:37:23,458 INFO L268 CegarLoopResult]: For program point L6-1(line 6) no Hoare annotation was computed. [2020-07-20 21:37:23,467 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 09:37:23 BoogieIcfgContainer [2020-07-20 21:37:23,467 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 21:37:23,475 INFO L168 Benchmark]: Toolchain (without parser) took 27066.80 ms. Allocated memory was 146.3 MB in the beginning and 396.9 MB in the end (delta: 250.6 MB). Free memory was 102.9 MB in the beginning and 229.4 MB in the end (delta: -126.5 MB). Peak memory consumption was 124.1 MB. Max. memory is 7.1 GB. [2020-07-20 21:37:23,475 INFO L168 Benchmark]: CDTParser took 0.58 ms. Allocated memory is still 146.3 MB. Free memory is still 120.8 MB. There was no memory consumed. Max. memory is 7.1 GB. [2020-07-20 21:37:23,476 INFO L168 Benchmark]: CACSL2BoogieTranslator took 223.90 ms. Allocated memory is still 146.3 MB. Free memory was 102.5 MB in the beginning and 93.5 MB in the end (delta: 9.0 MB). Peak memory consumption was 9.0 MB. Max. memory is 7.1 GB. [2020-07-20 21:37:23,481 INFO L168 Benchmark]: Boogie Preprocessor took 26.78 ms. Allocated memory is still 146.3 MB. Free memory was 93.5 MB in the beginning and 91.8 MB in the end (delta: 1.7 MB). Peak memory consumption was 1.7 MB. Max. memory is 7.1 GB. [2020-07-20 21:37:23,484 INFO L168 Benchmark]: RCFGBuilder took 316.98 ms. Allocated memory was 146.3 MB in the beginning and 203.4 MB in the end (delta: 57.1 MB). Free memory was 91.8 MB in the beginning and 172.1 MB in the end (delta: -80.3 MB). Peak memory consumption was 10.0 MB. Max. memory is 7.1 GB. [2020-07-20 21:37:23,488 INFO L168 Benchmark]: TraceAbstraction took 26493.40 ms. Allocated memory was 203.4 MB in the beginning and 396.9 MB in the end (delta: 193.5 MB). Free memory was 172.1 MB in the beginning and 229.4 MB in the end (delta: -57.3 MB). Peak memory consumption was 136.2 MB. Max. memory is 7.1 GB. [2020-07-20 21:37:23,494 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.58 ms. Allocated memory is still 146.3 MB. Free memory is still 120.8 MB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 223.90 ms. Allocated memory is still 146.3 MB. Free memory was 102.5 MB in the beginning and 93.5 MB in the end (delta: 9.0 MB). Peak memory consumption was 9.0 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 26.78 ms. Allocated memory is still 146.3 MB. Free memory was 93.5 MB in the beginning and 91.8 MB in the end (delta: 1.7 MB). Peak memory consumption was 1.7 MB. Max. memory is 7.1 GB. * RCFGBuilder took 316.98 ms. Allocated memory was 146.3 MB in the beginning and 203.4 MB in the end (delta: 57.1 MB). Free memory was 91.8 MB in the beginning and 172.1 MB in the end (delta: -80.3 MB). Peak memory consumption was 10.0 MB. Max. memory is 7.1 GB. * TraceAbstraction took 26493.40 ms. Allocated memory was 203.4 MB in the beginning and 396.9 MB in the end (delta: 193.5 MB). Free memory was 172.1 MB in the beginning and 229.4 MB in the end (delta: -57.3 MB). Peak memory consumption was 136.2 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 13]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 26.3s, OverallIterations: 12, TraceHistogramMax: 12, AutomataDifference: 1.9s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 200 SDtfs, 514 SDslu, 1542 SDs, 0 SdLazy, 830 SolverSat, 198 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.7s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 1067 GetRequests, 717 SyntacticMatches, 109 SemanticMatches, 241 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1124 ImplicationChecksByTransitivity, 3.4s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=48occurred in iteration=11, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 12 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 7 LocationsWithAnnotation, 9 PreInvPairs, 9 NumberOfFragments, 19 HoareAnnotationTreeSize, 9 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 7 FomulaSimplificationsInter, 0 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 20.5s InterpolantComputationTime, 552 NumberOfCodeBlocks, 416 NumberOfCodeBlocksAsserted, 33 NumberOfCheckSat, 990 ConstructedInterpolants, 0 QuantifiedInterpolants, 142320 SizeOfPredicates, 78 NumberOfNonLiveVariables, 1116 ConjunctsInSsa, 203 ConjunctsInUnsatCore, 22 InterpolantComputations, 2 PerfectInterpolantSequences, 1299/2794 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...