/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 NUM_FUNCTIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-invgen/MADWiFi-encode_ie_ok.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 14:09:25,478 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 14:09:25,481 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 14:09:25,501 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 14:09:25,502 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 14:09:25,504 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 14:09:25,506 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 14:09:25,521 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 14:09:25,524 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 14:09:25,524 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 14:09:25,526 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 14:09:25,528 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 14:09:25,528 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 14:09:25,532 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 14:09:25,533 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 14:09:25,534 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 14:09:25,535 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 14:09:25,536 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 14:09:25,537 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 14:09:25,539 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 14:09:25,541 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 14:09:25,542 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 14:09:25,543 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 14:09:25,544 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 14:09:25,547 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 14:09:25,555 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 14:09:25,556 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 14:09:25,556 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 14:09:25,557 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 [2020-07-21 14:09:25,572 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 14:09:25,573 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 14:09:25,574 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 14:09:25,574 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 14:09:25,574 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 14:09:25,575 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 14:09:25,575 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 14:09:25,575 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 14:09:25,575 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 14:09:25,575 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 14:09:25,576 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 14:09:25,576 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 14:09:25,576 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 14:09:25,576 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 14:09:25,576 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 14:09:25,577 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 14:09:25,577 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 14:09:25,577 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 14:09:25,577 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 14:09:25,577 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 14:09:25,578 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 14:09:25,578 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 14:09:25,578 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 14:09:25,578 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 14:09:25,578 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 14:09:25,579 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 14:09:25,579 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:09:25,579 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 14:09:25,579 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 14:09:25,579 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 -> NUM_FUNCTIONS 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 -> 2 [2020-07-21 14:09:25,876 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 14:09:25,895 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 14:09:25,899 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 14:09:25,901 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 14:09:25,901 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 14:09:25,904 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-invgen/MADWiFi-encode_ie_ok.i [2020-07-21 14:09:25,994 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/69750665a/9787a1196bd34d3ab2304142696afe7c/FLAG43c8f1a02 [2020-07-21 14:09:26,520 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 14:09:26,522 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-invgen/MADWiFi-encode_ie_ok.i [2020-07-21 14:09:26,530 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/69750665a/9787a1196bd34d3ab2304142696afe7c/FLAG43c8f1a02 [2020-07-21 14:09:26,897 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/69750665a/9787a1196bd34d3ab2304142696afe7c [2020-07-21 14:09:26,907 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 14:09:26,910 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 14:09:26,911 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 14:09:26,911 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 14:09:26,916 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 14:09:26,917 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 02:09:26" (1/1) ... [2020-07-21 14:09:26,921 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6af9b194 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:09:26, skipping insertion in model container [2020-07-21 14:09:26,921 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 02:09:26" (1/1) ... [2020-07-21 14:09:26,929 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 14:09:26,949 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 14:09:27,132 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 14:09:27,137 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 14:09:27,157 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 14:09:27,174 INFO L208 MainTranslator]: Completed translation [2020-07-21 14:09:27,174 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:09:27 WrapperNode [2020-07-21 14:09:27,174 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 14:09:27,175 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 14:09:27,176 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 14:09:27,176 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 14:09:27,192 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:09:27" (1/1) ... [2020-07-21 14:09:27,192 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:09:27" (1/1) ... [2020-07-21 14:09:27,199 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:09:27" (1/1) ... [2020-07-21 14:09:27,199 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:09:27" (1/1) ... [2020-07-21 14:09:27,204 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:09:27" (1/1) ... [2020-07-21 14:09:27,211 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:09:27" (1/1) ... [2020-07-21 14:09:27,212 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:09:27" (1/1) ... [2020-07-21 14:09:27,311 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 14:09:27,311 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 14:09:27,312 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 14:09:27,312 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 14:09:27,313 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:09:27" (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 [2020-07-21 14:09:27,386 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 14:09:27,387 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 14:09:27,387 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-21 14:09:27,387 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-21 14:09:27,387 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 14:09:27,387 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 14:09:27,388 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-21 14:09:27,388 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-21 14:09:27,388 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 14:09:27,388 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 14:09:27,388 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 14:09:27,389 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 14:09:27,389 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 14:09:27,655 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 14:09:27,655 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-21 14:09:27,660 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 02:09:27 BoogieIcfgContainer [2020-07-21 14:09:27,660 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 14:09:27,662 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 14:09:27,662 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 14:09:27,666 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 14:09:27,666 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 02:09:26" (1/3) ... [2020-07-21 14:09:27,668 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4c72bc18 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 02:09:27, skipping insertion in model container [2020-07-21 14:09:27,668 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:09:27" (2/3) ... [2020-07-21 14:09:27,669 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4c72bc18 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 02:09:27, skipping insertion in model container [2020-07-21 14:09:27,669 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 02:09:27" (3/3) ... [2020-07-21 14:09:27,671 INFO L109 eAbstractionObserver]: Analyzing ICFG MADWiFi-encode_ie_ok.i [2020-07-21 14:09:27,684 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 14:09:27,692 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 14:09:27,713 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 14:09:27,752 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 14:09:27,752 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 14:09:27,753 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 14:09:27,753 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 14:09:27,753 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 14:09:27,756 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 14:09:27,757 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 14:09:27,757 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 14:09:27,790 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states. [2020-07-21 14:09:27,797 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-21 14:09:27,798 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:09:27,799 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:09:27,800 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:09:27,824 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:09:27,825 INFO L82 PathProgramCache]: Analyzing trace with hash 921445730, now seen corresponding path program 1 times [2020-07-21 14:09:27,842 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:09:27,842 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2053640464] [2020-07-21 14:09:27,843 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 14:09:27,917 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:09:27,918 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:09:27,921 INFO L263 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-21 14:09:27,926 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:09:28,000 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:09:28,034 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 14:09:28,034 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 14:09:28,035 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2053640464] [2020-07-21 14:09:28,036 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 14:09:28,037 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-07-21 14:09:28,039 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1247136635] [2020-07-21 14:09:28,044 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-21 14:09:28,044 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:09:28,056 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-21 14:09:28,057 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-07-21 14:09:28,060 INFO L87 Difference]: Start difference. First operand 28 states. Second operand 6 states. [2020-07-21 14:09:28,216 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:09:28,216 INFO L93 Difference]: Finished difference Result 51 states and 67 transitions. [2020-07-21 14:09:28,217 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 14:09:28,219 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 18 [2020-07-21 14:09:28,220 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:09:28,230 INFO L225 Difference]: With dead ends: 51 [2020-07-21 14:09:28,230 INFO L226 Difference]: Without dead ends: 28 [2020-07-21 14:09:28,235 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-07-21 14:09:28,257 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-21 14:09:28,280 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-07-21 14:09:28,281 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-07-21 14:09:28,283 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2020-07-21 14:09:28,285 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 18 [2020-07-21 14:09:28,286 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:09:28,286 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2020-07-21 14:09:28,286 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-21 14:09:28,286 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2020-07-21 14:09:28,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-21 14:09:28,288 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:09:28,288 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:09:28,502 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:09:28,502 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:09:28,503 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:09:28,503 INFO L82 PathProgramCache]: Analyzing trace with hash 487181509, now seen corresponding path program 1 times [2020-07-21 14:09:28,503 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:09:28,504 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1829850345] [2020-07-21 14:09:28,504 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 14:09:28,583 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:09:28,583 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:09:28,585 INFO L263 TraceCheckSpWp]: Trace formula consists of 58 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 14:09:28,588 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:09:28,635 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:09:28,659 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 14:09:28,659 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 14:09:28,660 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1829850345] [2020-07-21 14:09:28,660 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 14:09:28,660 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-07-21 14:09:28,661 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [695463049] [2020-07-21 14:09:28,663 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-21 14:09:28,663 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:09:28,664 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-21 14:09:28,664 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-07-21 14:09:28,664 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 6 states. [2020-07-21 14:09:28,751 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:09:28,751 INFO L93 Difference]: Finished difference Result 38 states and 39 transitions. [2020-07-21 14:09:28,752 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 14:09:28,752 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 23 [2020-07-21 14:09:28,753 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:09:28,755 INFO L225 Difference]: With dead ends: 38 [2020-07-21 14:09:28,755 INFO L226 Difference]: Without dead ends: 36 [2020-07-21 14:09:28,757 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-07-21 14:09:28,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-07-21 14:09:28,769 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-07-21 14:09:28,769 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-21 14:09:28,771 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2020-07-21 14:09:28,771 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 23 [2020-07-21 14:09:28,771 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:09:28,772 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2020-07-21 14:09:28,772 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-21 14:09:28,772 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2020-07-21 14:09:28,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-07-21 14:09:28,774 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:09:28,775 INFO L422 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:09:28,990 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:09:28,991 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:09:28,991 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:09:28,992 INFO L82 PathProgramCache]: Analyzing trace with hash 258938125, now seen corresponding path program 1 times [2020-07-21 14:09:28,992 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:09:28,992 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1073777983] [2020-07-21 14:09:28,993 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 14:09:29,034 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:09:29,035 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:09:29,036 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 14:09:29,039 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:09:29,142 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:09:29,206 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-21 14:09:29,206 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:09:29,232 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:09:29,383 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1073777983] [2020-07-21 14:09:29,384 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 14:09:29,384 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-07-21 14:09:29,384 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [256813067] [2020-07-21 14:09:29,385 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 14:09:29,385 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:09:29,386 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 14:09:29,386 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2020-07-21 14:09:29,386 INFO L87 Difference]: Start difference. First operand 35 states and 36 transitions. Second operand 9 states. [2020-07-21 14:09:29,586 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:09:29,586 INFO L93 Difference]: Finished difference Result 47 states and 49 transitions. [2020-07-21 14:09:29,587 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 14:09:29,587 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 36 [2020-07-21 14:09:29,588 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:09:29,589 INFO L225 Difference]: With dead ends: 47 [2020-07-21 14:09:29,589 INFO L226 Difference]: Without dead ends: 45 [2020-07-21 14:09:29,590 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 35 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=64, Invalid=176, Unknown=0, NotChecked=0, Total=240 [2020-07-21 14:09:29,590 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-07-21 14:09:29,598 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 44. [2020-07-21 14:09:29,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-07-21 14:09:29,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2020-07-21 14:09:29,600 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 36 [2020-07-21 14:09:29,601 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:09:29,601 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2020-07-21 14:09:29,601 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 14:09:29,601 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2020-07-21 14:09:29,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-07-21 14:09:29,603 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:09:29,603 INFO L422 BasicCegarLoop]: trace histogram [6, 5, 5, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:09:29,817 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:09:29,818 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:09:29,819 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:09:29,819 INFO L82 PathProgramCache]: Analyzing trace with hash -801144379, now seen corresponding path program 2 times [2020-07-21 14:09:29,820 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:09:29,820 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2044636179] [2020-07-21 14:09:29,820 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 14:09:29,870 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:09:29,871 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:09:29,872 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 14:09:29,875 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:09:29,980 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:09:30,028 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 10 proven. 11 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-21 14:09:30,029 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:09:30,058 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:09:30,166 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2044636179] [2020-07-21 14:09:30,167 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 14:09:30,167 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-07-21 14:09:30,167 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [592982046] [2020-07-21 14:09:30,168 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 14:09:30,168 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:09:30,168 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 14:09:30,169 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=138, Unknown=0, NotChecked=0, Total=182 [2020-07-21 14:09:30,169 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand 11 states. [2020-07-21 14:09:30,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:09:30,453 INFO L93 Difference]: Finished difference Result 56 states and 59 transitions. [2020-07-21 14:09:30,453 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 14:09:30,453 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 49 [2020-07-21 14:09:30,454 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:09:30,455 INFO L225 Difference]: With dead ends: 56 [2020-07-21 14:09:30,457 INFO L226 Difference]: Without dead ends: 54 [2020-07-21 14:09:30,458 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 46 SyntacticMatches, 3 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=83, Invalid=259, Unknown=0, NotChecked=0, Total=342 [2020-07-21 14:09:30,458 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-07-21 14:09:30,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2020-07-21 14:09:30,472 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-07-21 14:09:30,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 56 transitions. [2020-07-21 14:09:30,476 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 56 transitions. Word has length 49 [2020-07-21 14:09:30,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:09:30,476 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 56 transitions. [2020-07-21 14:09:30,476 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 14:09:30,477 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 56 transitions. [2020-07-21 14:09:30,479 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-07-21 14:09:30,479 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:09:30,479 INFO L422 BasicCegarLoop]: trace histogram [8, 7, 7, 4, 4, 4, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:09:30,682 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:09:30,683 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:09:30,684 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:09:30,684 INFO L82 PathProgramCache]: Analyzing trace with hash -907575283, now seen corresponding path program 3 times [2020-07-21 14:09:30,685 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:09:30,685 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1337947837] [2020-07-21 14:09:30,686 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 14:09:30,732 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:09:30,732 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:09:30,733 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-21 14:09:30,737 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:09:30,887 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:09:30,947 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 14 proven. 24 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2020-07-21 14:09:30,947 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:09:30,972 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:09:31,081 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1337947837] [2020-07-21 14:09:31,082 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 14:09:31,082 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-07-21 14:09:31,082 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1686551458] [2020-07-21 14:09:31,083 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 14:09:31,083 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:09:31,084 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 14:09:31,084 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=186, Unknown=0, NotChecked=0, Total=240 [2020-07-21 14:09:31,085 INFO L87 Difference]: Start difference. First operand 53 states and 56 transitions. Second operand 13 states. [2020-07-21 14:09:31,431 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:09:31,432 INFO L93 Difference]: Finished difference Result 65 states and 69 transitions. [2020-07-21 14:09:31,433 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 14:09:31,433 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 62 [2020-07-21 14:09:31,434 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:09:31,435 INFO L225 Difference]: With dead ends: 65 [2020-07-21 14:09:31,435 INFO L226 Difference]: Without dead ends: 63 [2020-07-21 14:09:31,436 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 57 SyntacticMatches, 3 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=102, Invalid=360, Unknown=0, NotChecked=0, Total=462 [2020-07-21 14:09:31,436 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-07-21 14:09:31,445 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 62. [2020-07-21 14:09:31,446 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2020-07-21 14:09:31,447 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 66 transitions. [2020-07-21 14:09:31,448 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 66 transitions. Word has length 62 [2020-07-21 14:09:31,448 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:09:31,448 INFO L479 AbstractCegarLoop]: Abstraction has 62 states and 66 transitions. [2020-07-21 14:09:31,448 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 14:09:31,449 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 66 transitions. [2020-07-21 14:09:31,451 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2020-07-21 14:09:31,451 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:09:31,451 INFO L422 BasicCegarLoop]: trace histogram [10, 9, 9, 5, 5, 5, 5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:09:31,665 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:09:31,666 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:09:31,666 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:09:31,667 INFO L82 PathProgramCache]: Analyzing trace with hash -1945307451, now seen corresponding path program 4 times [2020-07-21 14:09:31,667 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:09:31,667 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [887418871] [2020-07-21 14:09:31,667 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 14:09:31,722 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:09:31,722 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:09:31,724 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-21 14:09:31,731 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:09:31,909 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:09:31,959 INFO L134 CoverageAnalysis]: Checked inductivity of 204 backedges. 18 proven. 42 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2020-07-21 14:09:31,967 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:09:31,993 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:09:32,136 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [887418871] [2020-07-21 14:09:32,136 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 14:09:32,136 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-07-21 14:09:32,137 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [728986733] [2020-07-21 14:09:32,137 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 14:09:32,138 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:09:32,138 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 14:09:32,139 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=242, Unknown=0, NotChecked=0, Total=306 [2020-07-21 14:09:32,139 INFO L87 Difference]: Start difference. First operand 62 states and 66 transitions. Second operand 15 states. [2020-07-21 14:09:32,511 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:09:32,511 INFO L93 Difference]: Finished difference Result 74 states and 79 transitions. [2020-07-21 14:09:32,511 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-07-21 14:09:32,512 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 75 [2020-07-21 14:09:32,513 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:09:32,514 INFO L225 Difference]: With dead ends: 74 [2020-07-21 14:09:32,514 INFO L226 Difference]: Without dead ends: 72 [2020-07-21 14:09:32,518 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 68 SyntacticMatches, 3 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 134 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=121, Invalid=479, Unknown=0, NotChecked=0, Total=600 [2020-07-21 14:09:32,518 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-07-21 14:09:32,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2020-07-21 14:09:32,543 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-21 14:09:32,546 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 76 transitions. [2020-07-21 14:09:32,546 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 76 transitions. Word has length 75 [2020-07-21 14:09:32,547 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:09:32,547 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 76 transitions. [2020-07-21 14:09:32,551 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 14:09:32,551 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 76 transitions. [2020-07-21 14:09:32,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2020-07-21 14:09:32,554 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:09:32,554 INFO L422 BasicCegarLoop]: trace histogram [12, 11, 11, 6, 6, 6, 6, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:09:32,768 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:09:32,769 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:09:32,770 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:09:32,770 INFO L82 PathProgramCache]: Analyzing trace with hash -1067439347, now seen corresponding path program 5 times [2020-07-21 14:09:32,770 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:09:32,771 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1822942859] [2020-07-21 14:09:32,771 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 14:09:32,834 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:09:32,835 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:09:32,836 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-21 14:09:32,840 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:09:33,053 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:09:33,104 INFO L134 CoverageAnalysis]: Checked inductivity of 307 backedges. 22 proven. 65 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2020-07-21 14:09:33,104 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:09:33,131 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:09:33,261 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1822942859] [2020-07-21 14:09:33,261 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 14:09:33,262 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-07-21 14:09:33,262 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [520984583] [2020-07-21 14:09:33,263 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 14:09:33,263 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:09:33,263 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 14:09:33,264 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=306, Unknown=0, NotChecked=0, Total=380 [2020-07-21 14:09:33,264 INFO L87 Difference]: Start difference. First operand 71 states and 76 transitions. Second operand 17 states. [2020-07-21 14:09:33,785 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:09:33,786 INFO L93 Difference]: Finished difference Result 83 states and 89 transitions. [2020-07-21 14:09:33,786 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-07-21 14:09:33,786 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 88 [2020-07-21 14:09:33,787 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:09:33,788 INFO L225 Difference]: With dead ends: 83 [2020-07-21 14:09:33,788 INFO L226 Difference]: Without dead ends: 81 [2020-07-21 14:09:33,789 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 79 SyntacticMatches, 3 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=140, Invalid=616, Unknown=0, NotChecked=0, Total=756 [2020-07-21 14:09:33,790 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2020-07-21 14:09:33,800 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 80. [2020-07-21 14:09:33,800 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2020-07-21 14:09:33,801 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 86 transitions. [2020-07-21 14:09:33,802 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 86 transitions. Word has length 88 [2020-07-21 14:09:33,802 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:09:33,802 INFO L479 AbstractCegarLoop]: Abstraction has 80 states and 86 transitions. [2020-07-21 14:09:33,802 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 14:09:33,803 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 86 transitions. [2020-07-21 14:09:33,804 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2020-07-21 14:09:33,804 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:09:33,805 INFO L422 BasicCegarLoop]: trace histogram [14, 13, 13, 7, 7, 7, 7, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:09:34,017 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:09:34,018 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:09:34,019 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:09:34,019 INFO L82 PathProgramCache]: Analyzing trace with hash -29217851, now seen corresponding path program 6 times [2020-07-21 14:09:34,020 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:09:34,020 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [785595547] [2020-07-21 14:09:34,021 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 14:09:34,065 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:09:34,065 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:09:34,067 INFO L263 TraceCheckSpWp]: Trace formula consists of 202 conjuncts, 21 conjunts are in the unsatisfiable core [2020-07-21 14:09:34,071 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:09:34,334 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:09:34,384 INFO L134 CoverageAnalysis]: Checked inductivity of 431 backedges. 26 proven. 93 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2020-07-21 14:09:34,384 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:09:34,417 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:09:34,554 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [785595547] [2020-07-21 14:09:34,555 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 14:09:34,555 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-07-21 14:09:34,555 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1979684484] [2020-07-21 14:09:34,556 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 14:09:34,557 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:09:34,557 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 14:09:34,558 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=378, Unknown=0, NotChecked=0, Total=462 [2020-07-21 14:09:34,558 INFO L87 Difference]: Start difference. First operand 80 states and 86 transitions. Second operand 19 states. [2020-07-21 14:09:35,167 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:09:35,167 INFO L93 Difference]: Finished difference Result 92 states and 99 transitions. [2020-07-21 14:09:35,168 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-07-21 14:09:35,168 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 101 [2020-07-21 14:09:35,169 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:09:35,170 INFO L225 Difference]: With dead ends: 92 [2020-07-21 14:09:35,171 INFO L226 Difference]: Without dead ends: 90 [2020-07-21 14:09:35,172 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 90 SyntacticMatches, 3 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 241 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=159, Invalid=771, Unknown=0, NotChecked=0, Total=930 [2020-07-21 14:09:35,172 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-07-21 14:09:35,183 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2020-07-21 14:09:35,183 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-07-21 14:09:35,184 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 96 transitions. [2020-07-21 14:09:35,185 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 96 transitions. Word has length 101 [2020-07-21 14:09:35,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:09:35,185 INFO L479 AbstractCegarLoop]: Abstraction has 89 states and 96 transitions. [2020-07-21 14:09:35,186 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 14:09:35,186 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 96 transitions. [2020-07-21 14:09:35,188 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2020-07-21 14:09:35,188 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:09:35,188 INFO L422 BasicCegarLoop]: trace histogram [16, 15, 15, 8, 8, 8, 8, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:09:35,401 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:09:35,402 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:09:35,403 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:09:35,403 INFO L82 PathProgramCache]: Analyzing trace with hash 923342349, now seen corresponding path program 7 times [2020-07-21 14:09:35,403 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:09:35,404 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [458419486] [2020-07-21 14:09:35,405 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 14:09:35,453 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:09:35,453 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:09:35,455 INFO L263 TraceCheckSpWp]: Trace formula consists of 226 conjuncts, 23 conjunts are in the unsatisfiable core [2020-07-21 14:09:35,459 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:09:35,719 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:09:35,779 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 30 proven. 126 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2020-07-21 14:09:35,779 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:09:35,814 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:09:35,967 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [458419486] [2020-07-21 14:09:35,967 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 14:09:35,967 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-07-21 14:09:35,967 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [284512537] [2020-07-21 14:09:35,968 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 14:09:35,968 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:09:35,968 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 14:09:35,969 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=458, Unknown=0, NotChecked=0, Total=552 [2020-07-21 14:09:35,969 INFO L87 Difference]: Start difference. First operand 89 states and 96 transitions. Second operand 21 states. [2020-07-21 14:09:36,742 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:09:36,742 INFO L93 Difference]: Finished difference Result 101 states and 109 transitions. [2020-07-21 14:09:36,743 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-07-21 14:09:36,743 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 114 [2020-07-21 14:09:36,744 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:09:36,745 INFO L225 Difference]: With dead ends: 101 [2020-07-21 14:09:36,745 INFO L226 Difference]: Without dead ends: 99 [2020-07-21 14:09:36,746 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 101 SyntacticMatches, 3 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 305 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=178, Invalid=944, Unknown=0, NotChecked=0, Total=1122 [2020-07-21 14:09:36,747 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2020-07-21 14:09:36,777 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 98. [2020-07-21 14:09:36,777 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 98 states. [2020-07-21 14:09:36,784 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 106 transitions. [2020-07-21 14:09:36,784 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 106 transitions. Word has length 114 [2020-07-21 14:09:36,785 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:09:36,785 INFO L479 AbstractCegarLoop]: Abstraction has 98 states and 106 transitions. [2020-07-21 14:09:36,785 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 14:09:36,785 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 106 transitions. [2020-07-21 14:09:36,787 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2020-07-21 14:09:36,790 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:09:36,791 INFO L422 BasicCegarLoop]: trace histogram [18, 17, 17, 9, 9, 9, 9, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:09:37,004 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:09:37,005 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:09:37,006 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:09:37,006 INFO L82 PathProgramCache]: Analyzing trace with hash 816783557, now seen corresponding path program 8 times [2020-07-21 14:09:37,007 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:09:37,007 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [542470881] [2020-07-21 14:09:37,008 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 14:09:37,059 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:09:37,060 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:09:37,062 INFO L263 TraceCheckSpWp]: Trace formula consists of 250 conjuncts, 25 conjunts are in the unsatisfiable core [2020-07-21 14:09:37,065 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:09:37,378 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:09:37,450 INFO L134 CoverageAnalysis]: Checked inductivity of 742 backedges. 34 proven. 164 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2020-07-21 14:09:37,450 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:09:37,490 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:09:37,645 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [542470881] [2020-07-21 14:09:37,645 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 14:09:37,645 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-07-21 14:09:37,646 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [684049699] [2020-07-21 14:09:37,646 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 14:09:37,646 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:09:37,647 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 14:09:37,647 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=546, Unknown=0, NotChecked=0, Total=650 [2020-07-21 14:09:37,647 INFO L87 Difference]: Start difference. First operand 98 states and 106 transitions. Second operand 23 states. [2020-07-21 14:09:38,441 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:09:38,441 INFO L93 Difference]: Finished difference Result 110 states and 119 transitions. [2020-07-21 14:09:38,442 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-07-21 14:09:38,442 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 127 [2020-07-21 14:09:38,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:09:38,444 INFO L225 Difference]: With dead ends: 110 [2020-07-21 14:09:38,444 INFO L226 Difference]: Without dead ends: 108 [2020-07-21 14:09:38,445 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 112 SyntacticMatches, 3 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 376 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=197, Invalid=1135, Unknown=0, NotChecked=0, Total=1332 [2020-07-21 14:09:38,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-07-21 14:09:38,456 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 107. [2020-07-21 14:09:38,456 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-07-21 14:09:38,458 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 116 transitions. [2020-07-21 14:09:38,458 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 116 transitions. Word has length 127 [2020-07-21 14:09:38,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:09:38,459 INFO L479 AbstractCegarLoop]: Abstraction has 107 states and 116 transitions. [2020-07-21 14:09:38,459 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 14:09:38,459 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 116 transitions. [2020-07-21 14:09:38,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2020-07-21 14:09:38,461 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:09:38,461 INFO L422 BasicCegarLoop]: trace histogram [20, 19, 19, 10, 10, 10, 10, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:09:38,676 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:09:38,677 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:09:38,678 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:09:38,678 INFO L82 PathProgramCache]: Analyzing trace with hash -1777188595, now seen corresponding path program 9 times [2020-07-21 14:09:38,679 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:09:38,679 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1491464673] [2020-07-21 14:09:38,680 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 14:09:38,735 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:09:38,736 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:09:38,738 INFO L263 TraceCheckSpWp]: Trace formula consists of 274 conjuncts, 27 conjunts are in the unsatisfiable core [2020-07-21 14:09:38,741 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:09:39,087 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:09:39,167 INFO L134 CoverageAnalysis]: Checked inductivity of 929 backedges. 38 proven. 207 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2020-07-21 14:09:39,167 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:09:39,203 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:09:39,348 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1491464673] [2020-07-21 14:09:39,348 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 14:09:39,348 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-07-21 14:09:39,348 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1942279495] [2020-07-21 14:09:39,349 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 14:09:39,349 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:09:39,349 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 14:09:39,350 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=642, Unknown=0, NotChecked=0, Total=756 [2020-07-21 14:09:39,350 INFO L87 Difference]: Start difference. First operand 107 states and 116 transitions. Second operand 25 states. [2020-07-21 14:09:40,337 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:09:40,337 INFO L93 Difference]: Finished difference Result 119 states and 129 transitions. [2020-07-21 14:09:40,338 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-07-21 14:09:40,338 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 140 [2020-07-21 14:09:40,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:09:40,341 INFO L225 Difference]: With dead ends: 119 [2020-07-21 14:09:40,341 INFO L226 Difference]: Without dead ends: 117 [2020-07-21 14:09:40,342 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 123 SyntacticMatches, 3 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 454 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=216, Invalid=1344, Unknown=0, NotChecked=0, Total=1560 [2020-07-21 14:09:40,343 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2020-07-21 14:09:40,353 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 116. [2020-07-21 14:09:40,354 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 116 states. [2020-07-21 14:09:40,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 126 transitions. [2020-07-21 14:09:40,355 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 126 transitions. Word has length 140 [2020-07-21 14:09:40,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:09:40,356 INFO L479 AbstractCegarLoop]: Abstraction has 116 states and 126 transitions. [2020-07-21 14:09:40,356 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 14:09:40,357 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 126 transitions. [2020-07-21 14:09:40,359 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2020-07-21 14:09:40,359 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:09:40,359 INFO L422 BasicCegarLoop]: trace histogram [22, 21, 21, 11, 11, 11, 11, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:09:40,573 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:09:40,574 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:09:40,575 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:09:40,575 INFO L82 PathProgramCache]: Analyzing trace with hash -1994140219, now seen corresponding path program 10 times [2020-07-21 14:09:40,575 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:09:40,576 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1584768397] [2020-07-21 14:09:40,576 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 14:09:40,644 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:09:40,644 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:09:40,646 INFO L263 TraceCheckSpWp]: Trace formula consists of 298 conjuncts, 29 conjunts are in the unsatisfiable core [2020-07-21 14:09:40,648 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:09:41,052 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:09:41,140 INFO L134 CoverageAnalysis]: Checked inductivity of 1137 backedges. 42 proven. 255 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2020-07-21 14:09:41,141 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:09:41,181 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:09:41,351 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1584768397] [2020-07-21 14:09:41,352 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 14:09:41,352 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-07-21 14:09:41,352 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [428474435] [2020-07-21 14:09:41,353 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-21 14:09:41,353 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:09:41,353 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-21 14:09:41,353 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=746, Unknown=0, NotChecked=0, Total=870 [2020-07-21 14:09:41,354 INFO L87 Difference]: Start difference. First operand 116 states and 126 transitions. Second operand 27 states. [2020-07-21 14:09:42,426 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:09:42,426 INFO L93 Difference]: Finished difference Result 128 states and 139 transitions. [2020-07-21 14:09:42,428 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-07-21 14:09:42,429 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 153 [2020-07-21 14:09:42,429 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:09:42,430 INFO L225 Difference]: With dead ends: 128 [2020-07-21 14:09:42,430 INFO L226 Difference]: Without dead ends: 126 [2020-07-21 14:09:42,432 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 134 SyntacticMatches, 3 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 539 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=235, Invalid=1571, Unknown=0, NotChecked=0, Total=1806 [2020-07-21 14:09:42,432 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2020-07-21 14:09:42,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 125. [2020-07-21 14:09:42,446 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 125 states. [2020-07-21 14:09:42,447 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 136 transitions. [2020-07-21 14:09:42,447 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 136 transitions. Word has length 153 [2020-07-21 14:09:42,453 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:09:42,453 INFO L479 AbstractCegarLoop]: Abstraction has 125 states and 136 transitions. [2020-07-21 14:09:42,453 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-21 14:09:42,454 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 136 transitions. [2020-07-21 14:09:42,456 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 167 [2020-07-21 14:09:42,456 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:09:42,456 INFO L422 BasicCegarLoop]: trace histogram [24, 23, 23, 12, 12, 12, 12, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:09:42,669 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:09:42,670 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:09:42,670 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:09:42,671 INFO L82 PathProgramCache]: Analyzing trace with hash 1772858381, now seen corresponding path program 11 times [2020-07-21 14:09:42,671 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:09:42,672 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [320796713] [2020-07-21 14:09:42,672 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:09:42,737 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:09:42,737 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:09:42,739 INFO L263 TraceCheckSpWp]: Trace formula consists of 322 conjuncts, 31 conjunts are in the unsatisfiable core [2020-07-21 14:09:42,744 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:09:43,199 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:09:43,290 INFO L134 CoverageAnalysis]: Checked inductivity of 1366 backedges. 46 proven. 308 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2020-07-21 14:09:43,290 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:09:43,338 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:09:43,520 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [320796713] [2020-07-21 14:09:43,521 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 14:09:43,521 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-07-21 14:09:43,521 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [788044414] [2020-07-21 14:09:43,522 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 14:09:43,522 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:09:43,522 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 14:09:43,523 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=858, Unknown=0, NotChecked=0, Total=992 [2020-07-21 14:09:43,523 INFO L87 Difference]: Start difference. First operand 125 states and 136 transitions. Second operand 29 states. [2020-07-21 14:09:44,671 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:09:44,671 INFO L93 Difference]: Finished difference Result 137 states and 149 transitions. [2020-07-21 14:09:44,671 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-07-21 14:09:44,672 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 166 [2020-07-21 14:09:44,673 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:09:44,674 INFO L225 Difference]: With dead ends: 137 [2020-07-21 14:09:44,674 INFO L226 Difference]: Without dead ends: 135 [2020-07-21 14:09:44,675 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 145 SyntacticMatches, 3 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 631 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=254, Invalid=1816, Unknown=0, NotChecked=0, Total=2070 [2020-07-21 14:09:44,676 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2020-07-21 14:09:44,686 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 134. [2020-07-21 14:09:44,686 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 134 states. [2020-07-21 14:09:44,687 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 146 transitions. [2020-07-21 14:09:44,688 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 146 transitions. Word has length 166 [2020-07-21 14:09:44,688 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:09:44,688 INFO L479 AbstractCegarLoop]: Abstraction has 134 states and 146 transitions. [2020-07-21 14:09:44,689 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 14:09:44,689 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 146 transitions. [2020-07-21 14:09:44,691 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 180 [2020-07-21 14:09:44,691 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:09:44,691 INFO L422 BasicCegarLoop]: trace histogram [26, 25, 25, 13, 13, 13, 13, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:09:44,905 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:09:44,906 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:09:44,906 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:09:44,907 INFO L82 PathProgramCache]: Analyzing trace with hash -915387707, now seen corresponding path program 12 times [2020-07-21 14:09:44,907 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:09:44,907 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1118807809] [2020-07-21 14:09:44,908 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:09:44,974 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:09:44,974 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:09:44,977 INFO L263 TraceCheckSpWp]: Trace formula consists of 346 conjuncts, 33 conjunts are in the unsatisfiable core [2020-07-21 14:09:44,981 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:09:45,494 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:09:45,583 INFO L134 CoverageAnalysis]: Checked inductivity of 1616 backedges. 50 proven. 366 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2020-07-21 14:09:45,584 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:09:45,631 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:09:45,818 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1118807809] [2020-07-21 14:09:45,818 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 14:09:45,819 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-07-21 14:09:45,819 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [488475792] [2020-07-21 14:09:45,819 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-07-21 14:09:45,820 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:09:45,820 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-07-21 14:09:45,820 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=978, Unknown=0, NotChecked=0, Total=1122 [2020-07-21 14:09:45,821 INFO L87 Difference]: Start difference. First operand 134 states and 146 transitions. Second operand 31 states. [2020-07-21 14:09:47,208 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:09:47,208 INFO L93 Difference]: Finished difference Result 146 states and 159 transitions. [2020-07-21 14:09:47,209 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-07-21 14:09:47,209 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 179 [2020-07-21 14:09:47,210 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:09:47,211 INFO L225 Difference]: With dead ends: 146 [2020-07-21 14:09:47,211 INFO L226 Difference]: Without dead ends: 144 [2020-07-21 14:09:47,212 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 206 GetRequests, 156 SyntacticMatches, 3 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 730 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=273, Invalid=2079, Unknown=0, NotChecked=0, Total=2352 [2020-07-21 14:09:47,213 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2020-07-21 14:09:47,223 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 143. [2020-07-21 14:09:47,223 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 143 states. [2020-07-21 14:09:47,224 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 156 transitions. [2020-07-21 14:09:47,225 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 156 transitions. Word has length 179 [2020-07-21 14:09:47,225 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:09:47,225 INFO L479 AbstractCegarLoop]: Abstraction has 143 states and 156 transitions. [2020-07-21 14:09:47,225 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-07-21 14:09:47,226 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 156 transitions. [2020-07-21 14:09:47,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 193 [2020-07-21 14:09:47,228 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:09:47,228 INFO L422 BasicCegarLoop]: trace histogram [28, 27, 27, 14, 14, 14, 14, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:09:47,441 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:09:47,442 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:09:47,442 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:09:47,442 INFO L82 PathProgramCache]: Analyzing trace with hash 1644517133, now seen corresponding path program 13 times [2020-07-21 14:09:47,442 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:09:47,443 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1852999935] [2020-07-21 14:09:47,443 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:09:47,508 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:09:47,508 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:09:47,510 INFO L263 TraceCheckSpWp]: Trace formula consists of 370 conjuncts, 35 conjunts are in the unsatisfiable core [2020-07-21 14:09:47,513 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:09:48,080 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:09:48,183 INFO L134 CoverageAnalysis]: Checked inductivity of 1887 backedges. 54 proven. 429 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2020-07-21 14:09:48,183 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:09:48,232 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:09:48,434 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1852999935] [2020-07-21 14:09:48,435 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 14:09:48,435 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-07-21 14:09:48,435 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1858679501] [2020-07-21 14:09:48,436 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-07-21 14:09:48,436 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:09:48,436 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-07-21 14:09:48,439 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=154, Invalid=1106, Unknown=0, NotChecked=0, Total=1260 [2020-07-21 14:09:48,439 INFO L87 Difference]: Start difference. First operand 143 states and 156 transitions. Second operand 33 states. [2020-07-21 14:09:49,964 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:09:49,965 INFO L93 Difference]: Finished difference Result 155 states and 169 transitions. [2020-07-21 14:09:49,965 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-07-21 14:09:49,965 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 192 [2020-07-21 14:09:49,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:09:49,967 INFO L225 Difference]: With dead ends: 155 [2020-07-21 14:09:49,967 INFO L226 Difference]: Without dead ends: 153 [2020-07-21 14:09:49,969 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 220 GetRequests, 167 SyntacticMatches, 3 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 836 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=292, Invalid=2360, Unknown=0, NotChecked=0, Total=2652 [2020-07-21 14:09:49,973 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 153 states. [2020-07-21 14:09:49,991 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 153 to 152. [2020-07-21 14:09:49,992 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 152 states. [2020-07-21 14:09:49,995 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 166 transitions. [2020-07-21 14:09:49,996 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 166 transitions. Word has length 192 [2020-07-21 14:09:49,997 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:09:49,997 INFO L479 AbstractCegarLoop]: Abstraction has 152 states and 166 transitions. [2020-07-21 14:09:49,997 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-07-21 14:09:49,998 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 166 transitions. [2020-07-21 14:09:50,003 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 206 [2020-07-21 14:09:50,004 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:09:50,004 INFO L422 BasicCegarLoop]: trace histogram [30, 29, 29, 15, 15, 15, 15, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:09:50,218 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:09:50,219 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:09:50,219 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:09:50,219 INFO L82 PathProgramCache]: Analyzing trace with hash 258244549, now seen corresponding path program 14 times [2020-07-21 14:09:50,220 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:09:50,220 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1017617651] [2020-07-21 14:09:50,220 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:09:50,307 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:09:50,307 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:09:50,309 INFO L263 TraceCheckSpWp]: Trace formula consists of 394 conjuncts, 37 conjunts are in the unsatisfiable core [2020-07-21 14:09:50,312 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:09:50,977 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:09:51,127 INFO L134 CoverageAnalysis]: Checked inductivity of 2179 backedges. 58 proven. 497 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2020-07-21 14:09:51,128 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:09:51,181 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:09:51,389 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1017617651] [2020-07-21 14:09:51,390 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 14:09:51,390 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-07-21 14:09:51,390 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1657303559] [2020-07-21 14:09:51,391 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-07-21 14:09:51,392 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:09:51,392 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-07-21 14:09:51,393 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=164, Invalid=1242, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 14:09:51,393 INFO L87 Difference]: Start difference. First operand 152 states and 166 transitions. Second operand 35 states. [2020-07-21 14:09:53,150 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:09:53,150 INFO L93 Difference]: Finished difference Result 164 states and 179 transitions. [2020-07-21 14:09:53,151 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2020-07-21 14:09:53,151 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 205 [2020-07-21 14:09:53,151 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:09:53,153 INFO L225 Difference]: With dead ends: 164 [2020-07-21 14:09:53,153 INFO L226 Difference]: Without dead ends: 162 [2020-07-21 14:09:53,155 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 234 GetRequests, 178 SyntacticMatches, 3 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 949 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=311, Invalid=2659, Unknown=0, NotChecked=0, Total=2970 [2020-07-21 14:09:53,156 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2020-07-21 14:09:53,171 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 161. [2020-07-21 14:09:53,172 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 161 states. [2020-07-21 14:09:53,173 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 161 states to 161 states and 176 transitions. [2020-07-21 14:09:53,173 INFO L78 Accepts]: Start accepts. Automaton has 161 states and 176 transitions. Word has length 205 [2020-07-21 14:09:53,175 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:09:53,176 INFO L479 AbstractCegarLoop]: Abstraction has 161 states and 176 transitions. [2020-07-21 14:09:53,176 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-07-21 14:09:53,176 INFO L276 IsEmpty]: Start isEmpty. Operand 161 states and 176 transitions. [2020-07-21 14:09:53,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 219 [2020-07-21 14:09:53,181 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:09:53,181 INFO L422 BasicCegarLoop]: trace histogram [32, 31, 31, 16, 16, 16, 16, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:09:53,395 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:09:53,396 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:09:53,396 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:09:53,397 INFO L82 PathProgramCache]: Analyzing trace with hash 1397703181, now seen corresponding path program 15 times [2020-07-21 14:09:53,397 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:09:53,397 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1371195175] [2020-07-21 14:09:53,398 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:09:53,471 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:09:53,471 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:09:53,473 INFO L263 TraceCheckSpWp]: Trace formula consists of 418 conjuncts, 39 conjunts are in the unsatisfiable core [2020-07-21 14:09:53,477 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:09:54,177 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:09:54,313 INFO L134 CoverageAnalysis]: Checked inductivity of 2492 backedges. 62 proven. 570 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2020-07-21 14:09:54,314 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:09:54,371 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:09:54,579 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1371195175] [2020-07-21 14:09:54,579 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 14:09:54,580 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-07-21 14:09:54,580 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1397092469] [2020-07-21 14:09:54,581 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-07-21 14:09:54,581 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:09:54,582 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-07-21 14:09:54,583 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=1386, Unknown=0, NotChecked=0, Total=1560 [2020-07-21 14:09:54,583 INFO L87 Difference]: Start difference. First operand 161 states and 176 transitions. Second operand 37 states. [2020-07-21 14:09:56,455 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:09:56,455 INFO L93 Difference]: Finished difference Result 173 states and 189 transitions. [2020-07-21 14:09:56,456 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2020-07-21 14:09:56,456 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 218 [2020-07-21 14:09:56,457 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:09:56,458 INFO L225 Difference]: With dead ends: 173 [2020-07-21 14:09:56,459 INFO L226 Difference]: Without dead ends: 171 [2020-07-21 14:09:56,461 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 248 GetRequests, 189 SyntacticMatches, 3 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1069 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=330, Invalid=2976, Unknown=0, NotChecked=0, Total=3306 [2020-07-21 14:09:56,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 171 states. [2020-07-21 14:09:56,473 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 171 to 170. [2020-07-21 14:09:56,473 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 170 states. [2020-07-21 14:09:56,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 170 states to 170 states and 186 transitions. [2020-07-21 14:09:56,475 INFO L78 Accepts]: Start accepts. Automaton has 170 states and 186 transitions. Word has length 218 [2020-07-21 14:09:56,475 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:09:56,476 INFO L479 AbstractCegarLoop]: Abstraction has 170 states and 186 transitions. [2020-07-21 14:09:56,476 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-07-21 14:09:56,476 INFO L276 IsEmpty]: Start isEmpty. Operand 170 states and 186 transitions. [2020-07-21 14:09:56,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 232 [2020-07-21 14:09:56,477 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:09:56,478 INFO L422 BasicCegarLoop]: trace histogram [34, 33, 33, 17, 17, 17, 17, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:09:56,691 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:09:56,692 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:09:56,692 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:09:56,693 INFO L82 PathProgramCache]: Analyzing trace with hash -724536123, now seen corresponding path program 16 times [2020-07-21 14:09:56,693 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:09:56,694 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [932607700] [2020-07-21 14:09:56,694 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:09:56,772 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:09:56,772 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:09:56,774 INFO L263 TraceCheckSpWp]: Trace formula consists of 442 conjuncts, 41 conjunts are in the unsatisfiable core [2020-07-21 14:09:56,779 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:09:57,528 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:09:57,675 INFO L134 CoverageAnalysis]: Checked inductivity of 2826 backedges. 66 proven. 648 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2020-07-21 14:09:57,675 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:09:57,737 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:09:57,956 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [932607700] [2020-07-21 14:09:57,956 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 14:09:57,957 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-07-21 14:09:57,957 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [73715588] [2020-07-21 14:09:57,957 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-07-21 14:09:57,958 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:09:57,958 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-07-21 14:09:57,959 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=1538, Unknown=0, NotChecked=0, Total=1722 [2020-07-21 14:09:57,959 INFO L87 Difference]: Start difference. First operand 170 states and 186 transitions. Second operand 39 states. [2020-07-21 14:10:00,194 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:10:00,195 INFO L93 Difference]: Finished difference Result 182 states and 199 transitions. [2020-07-21 14:10:00,200 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2020-07-21 14:10:00,200 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 231 [2020-07-21 14:10:00,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:10:00,202 INFO L225 Difference]: With dead ends: 182 [2020-07-21 14:10:00,202 INFO L226 Difference]: Without dead ends: 180 [2020-07-21 14:10:00,204 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 262 GetRequests, 200 SyntacticMatches, 3 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1196 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=349, Invalid=3311, Unknown=0, NotChecked=0, Total=3660 [2020-07-21 14:10:00,204 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2020-07-21 14:10:00,216 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 179. [2020-07-21 14:10:00,217 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 179 states. [2020-07-21 14:10:00,218 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 196 transitions. [2020-07-21 14:10:00,218 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 196 transitions. Word has length 231 [2020-07-21 14:10:00,219 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:10:00,219 INFO L479 AbstractCegarLoop]: Abstraction has 179 states and 196 transitions. [2020-07-21 14:10:00,219 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-07-21 14:10:00,219 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 196 transitions. [2020-07-21 14:10:00,221 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 245 [2020-07-21 14:10:00,221 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:10:00,221 INFO L422 BasicCegarLoop]: trace histogram [36, 35, 35, 18, 18, 18, 18, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:10:00,435 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:10:00,436 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:10:00,436 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:10:00,437 INFO L82 PathProgramCache]: Analyzing trace with hash 901344525, now seen corresponding path program 17 times [2020-07-21 14:10:00,437 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:10:00,437 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2020775848] [2020-07-21 14:10:00,438 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:10:00,514 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:10:00,515 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:10:00,517 INFO L263 TraceCheckSpWp]: Trace formula consists of 466 conjuncts, 43 conjunts are in the unsatisfiable core [2020-07-21 14:10:00,530 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:10:01,406 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:10:01,560 INFO L134 CoverageAnalysis]: Checked inductivity of 3181 backedges. 70 proven. 731 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2020-07-21 14:10:01,560 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:10:01,626 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:10:01,861 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2020775848] [2020-07-21 14:10:01,862 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 14:10:01,862 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-07-21 14:10:01,862 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1299090782] [2020-07-21 14:10:01,863 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-07-21 14:10:01,863 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:10:01,863 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-07-21 14:10:01,864 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=194, Invalid=1698, Unknown=0, NotChecked=0, Total=1892 [2020-07-21 14:10:01,864 INFO L87 Difference]: Start difference. First operand 179 states and 196 transitions. Second operand 41 states. [2020-07-21 14:10:04,307 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:10:04,307 INFO L93 Difference]: Finished difference Result 191 states and 209 transitions. [2020-07-21 14:10:04,313 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2020-07-21 14:10:04,314 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 244 [2020-07-21 14:10:04,314 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:10:04,315 INFO L225 Difference]: With dead ends: 191 [2020-07-21 14:10:04,315 INFO L226 Difference]: Without dead ends: 189 [2020-07-21 14:10:04,317 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 276 GetRequests, 211 SyntacticMatches, 3 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1330 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=368, Invalid=3664, Unknown=0, NotChecked=0, Total=4032 [2020-07-21 14:10:04,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 189 states. [2020-07-21 14:10:04,331 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 189 to 188. [2020-07-21 14:10:04,331 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 188 states. [2020-07-21 14:10:04,332 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 188 states to 188 states and 206 transitions. [2020-07-21 14:10:04,333 INFO L78 Accepts]: Start accepts. Automaton has 188 states and 206 transitions. Word has length 244 [2020-07-21 14:10:04,333 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:10:04,333 INFO L479 AbstractCegarLoop]: Abstraction has 188 states and 206 transitions. [2020-07-21 14:10:04,334 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-07-21 14:10:04,334 INFO L276 IsEmpty]: Start isEmpty. Operand 188 states and 206 transitions. [2020-07-21 14:10:04,335 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 258 [2020-07-21 14:10:04,335 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:10:04,336 INFO L422 BasicCegarLoop]: trace histogram [38, 37, 37, 19, 19, 19, 19, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:10:04,548 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:10:04,549 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:10:04,549 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:10:04,550 INFO L82 PathProgramCache]: Analyzing trace with hash -276551227, now seen corresponding path program 18 times [2020-07-21 14:10:04,550 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:10:04,550 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1018968287] [2020-07-21 14:10:04,550 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:10:04,636 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:10:04,637 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:10:04,639 INFO L263 TraceCheckSpWp]: Trace formula consists of 490 conjuncts, 45 conjunts are in the unsatisfiable core [2020-07-21 14:10:04,644 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:10:05,585 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:10:05,753 INFO L134 CoverageAnalysis]: Checked inductivity of 3557 backedges. 74 proven. 819 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2020-07-21 14:10:05,753 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:10:05,822 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:10:06,075 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1018968287] [2020-07-21 14:10:06,075 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 14:10:06,075 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-07-21 14:10:06,076 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1935762055] [2020-07-21 14:10:06,076 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-07-21 14:10:06,076 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:10:06,077 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-07-21 14:10:06,077 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=204, Invalid=1866, Unknown=0, NotChecked=0, Total=2070 [2020-07-21 14:10:06,077 INFO L87 Difference]: Start difference. First operand 188 states and 206 transitions. Second operand 43 states. [2020-07-21 14:10:08,613 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:10:08,613 INFO L93 Difference]: Finished difference Result 200 states and 219 transitions. [2020-07-21 14:10:08,614 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2020-07-21 14:10:08,614 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 257 [2020-07-21 14:10:08,615 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:10:08,617 INFO L225 Difference]: With dead ends: 200 [2020-07-21 14:10:08,617 INFO L226 Difference]: Without dead ends: 198 [2020-07-21 14:10:08,621 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 290 GetRequests, 222 SyntacticMatches, 3 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1471 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=387, Invalid=4035, Unknown=0, NotChecked=0, Total=4422 [2020-07-21 14:10:08,622 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 198 states. [2020-07-21 14:10:08,638 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 198 to 197. [2020-07-21 14:10:08,638 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 197 states. [2020-07-21 14:10:08,640 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 197 states to 197 states and 216 transitions. [2020-07-21 14:10:08,640 INFO L78 Accepts]: Start accepts. Automaton has 197 states and 216 transitions. Word has length 257 [2020-07-21 14:10:08,643 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:10:08,643 INFO L479 AbstractCegarLoop]: Abstraction has 197 states and 216 transitions. [2020-07-21 14:10:08,643 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-07-21 14:10:08,644 INFO L276 IsEmpty]: Start isEmpty. Operand 197 states and 216 transitions. [2020-07-21 14:10:08,645 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 271 [2020-07-21 14:10:08,645 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:10:08,646 INFO L422 BasicCegarLoop]: trace histogram [40, 39, 39, 20, 20, 20, 20, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:10:08,846 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:10:08,847 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:10:08,847 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:10:08,847 INFO L82 PathProgramCache]: Analyzing trace with hash 628348941, now seen corresponding path program 19 times [2020-07-21 14:10:08,848 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:10:08,848 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2060191399] [2020-07-21 14:10:08,848 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:10:08,928 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:10:08,928 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:10:08,930 INFO L263 TraceCheckSpWp]: Trace formula consists of 514 conjuncts, 47 conjunts are in the unsatisfiable core [2020-07-21 14:10:08,935 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:10:09,988 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:10:10,168 INFO L134 CoverageAnalysis]: Checked inductivity of 3954 backedges. 78 proven. 912 refuted. 0 times theorem prover too weak. 2964 trivial. 0 not checked. [2020-07-21 14:10:10,169 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:10:10,242 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:10:10,507 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2060191399] [2020-07-21 14:10:10,508 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 14:10:10,508 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-07-21 14:10:10,508 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [115918680] [2020-07-21 14:10:10,509 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-07-21 14:10:10,509 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:10:10,509 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-07-21 14:10:10,510 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=214, Invalid=2042, Unknown=0, NotChecked=0, Total=2256 [2020-07-21 14:10:10,510 INFO L87 Difference]: Start difference. First operand 197 states and 216 transitions. Second operand 45 states. [2020-07-21 14:10:13,333 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:10:13,333 INFO L93 Difference]: Finished difference Result 209 states and 229 transitions. [2020-07-21 14:10:13,334 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2020-07-21 14:10:13,334 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 270 [2020-07-21 14:10:13,335 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:10:13,337 INFO L225 Difference]: With dead ends: 209 [2020-07-21 14:10:13,338 INFO L226 Difference]: Without dead ends: 207 [2020-07-21 14:10:13,340 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 304 GetRequests, 233 SyntacticMatches, 3 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1619 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=406, Invalid=4424, Unknown=0, NotChecked=0, Total=4830 [2020-07-21 14:10:13,340 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 207 states. [2020-07-21 14:10:13,355 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 207 to 206. [2020-07-21 14:10:13,356 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 206 states. [2020-07-21 14:10:13,357 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 206 states to 206 states and 226 transitions. [2020-07-21 14:10:13,357 INFO L78 Accepts]: Start accepts. Automaton has 206 states and 226 transitions. Word has length 270 [2020-07-21 14:10:13,358 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:10:13,358 INFO L479 AbstractCegarLoop]: Abstraction has 206 states and 226 transitions. [2020-07-21 14:10:13,358 INFO L480 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-07-21 14:10:13,358 INFO L276 IsEmpty]: Start isEmpty. Operand 206 states and 226 transitions. [2020-07-21 14:10:13,360 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 284 [2020-07-21 14:10:13,360 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:10:13,361 INFO L422 BasicCegarLoop]: trace histogram [42, 41, 41, 21, 21, 21, 21, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:10:13,573 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:10:13,574 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:10:13,574 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:10:13,575 INFO L82 PathProgramCache]: Analyzing trace with hash -1857052987, now seen corresponding path program 20 times [2020-07-21 14:10:13,575 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:10:13,575 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1972745608] [2020-07-21 14:10:13,575 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:10:13,682 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:10:13,682 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:10:13,686 INFO L263 TraceCheckSpWp]: Trace formula consists of 538 conjuncts, 49 conjunts are in the unsatisfiable core [2020-07-21 14:10:13,692 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:10:14,892 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:10:15,082 INFO L134 CoverageAnalysis]: Checked inductivity of 4372 backedges. 82 proven. 1010 refuted. 0 times theorem prover too weak. 3280 trivial. 0 not checked. [2020-07-21 14:10:15,082 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:10:15,160 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:10:15,451 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1972745608] [2020-07-21 14:10:15,451 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 14:10:15,452 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47] total 47 [2020-07-21 14:10:15,452 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1394045243] [2020-07-21 14:10:15,452 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-07-21 14:10:15,452 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:10:15,453 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-07-21 14:10:15,454 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=224, Invalid=2226, Unknown=0, NotChecked=0, Total=2450 [2020-07-21 14:10:15,454 INFO L87 Difference]: Start difference. First operand 206 states and 226 transitions. Second operand 47 states. [2020-07-21 14:10:18,455 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:10:18,456 INFO L93 Difference]: Finished difference Result 218 states and 239 transitions. [2020-07-21 14:10:18,457 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2020-07-21 14:10:18,457 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 283 [2020-07-21 14:10:18,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:10:18,460 INFO L225 Difference]: With dead ends: 218 [2020-07-21 14:10:18,460 INFO L226 Difference]: Without dead ends: 216 [2020-07-21 14:10:18,461 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 318 GetRequests, 244 SyntacticMatches, 3 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1774 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=425, Invalid=4831, Unknown=0, NotChecked=0, Total=5256 [2020-07-21 14:10:18,462 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 216 states. [2020-07-21 14:10:18,476 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 216 to 215. [2020-07-21 14:10:18,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 215 states. [2020-07-21 14:10:18,478 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 215 states to 215 states and 236 transitions. [2020-07-21 14:10:18,478 INFO L78 Accepts]: Start accepts. Automaton has 215 states and 236 transitions. Word has length 283 [2020-07-21 14:10:18,479 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:10:18,479 INFO L479 AbstractCegarLoop]: Abstraction has 215 states and 236 transitions. [2020-07-21 14:10:18,479 INFO L480 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-07-21 14:10:18,479 INFO L276 IsEmpty]: Start isEmpty. Operand 215 states and 236 transitions. [2020-07-21 14:10:18,481 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 297 [2020-07-21 14:10:18,481 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:10:18,481 INFO L422 BasicCegarLoop]: trace histogram [44, 43, 43, 22, 22, 22, 22, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:10:18,686 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:10:18,687 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:10:18,687 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:10:18,688 INFO L82 PathProgramCache]: Analyzing trace with hash 1655603981, now seen corresponding path program 21 times [2020-07-21 14:10:18,688 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:10:18,688 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [749868473] [2020-07-21 14:10:18,689 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:10:18,782 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:10:18,782 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:10:18,784 INFO L263 TraceCheckSpWp]: Trace formula consists of 562 conjuncts, 51 conjunts are in the unsatisfiable core [2020-07-21 14:10:18,790 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:10:20,328 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:10:20,527 INFO L134 CoverageAnalysis]: Checked inductivity of 4811 backedges. 86 proven. 1113 refuted. 0 times theorem prover too weak. 3612 trivial. 0 not checked. [2020-07-21 14:10:20,527 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:10:20,611 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:10:20,908 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [749868473] [2020-07-21 14:10:20,909 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 14:10:20,909 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49] total 49 [2020-07-21 14:10:20,909 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [918903533] [2020-07-21 14:10:20,910 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2020-07-21 14:10:20,910 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:10:20,910 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2020-07-21 14:10:20,911 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=234, Invalid=2418, Unknown=0, NotChecked=0, Total=2652 [2020-07-21 14:10:20,911 INFO L87 Difference]: Start difference. First operand 215 states and 236 transitions. Second operand 49 states. [2020-07-21 14:10:24,296 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:10:24,296 INFO L93 Difference]: Finished difference Result 227 states and 249 transitions. [2020-07-21 14:10:24,297 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2020-07-21 14:10:24,297 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 296 [2020-07-21 14:10:24,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:10:24,300 INFO L225 Difference]: With dead ends: 227 [2020-07-21 14:10:24,300 INFO L226 Difference]: Without dead ends: 225 [2020-07-21 14:10:24,302 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 332 GetRequests, 255 SyntacticMatches, 3 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1936 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=444, Invalid=5256, Unknown=0, NotChecked=0, Total=5700 [2020-07-21 14:10:24,302 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 225 states. [2020-07-21 14:10:24,318 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 225 to 224. [2020-07-21 14:10:24,318 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 224 states. [2020-07-21 14:10:24,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 224 states to 224 states and 246 transitions. [2020-07-21 14:10:24,320 INFO L78 Accepts]: Start accepts. Automaton has 224 states and 246 transitions. Word has length 296 [2020-07-21 14:10:24,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:10:24,320 INFO L479 AbstractCegarLoop]: Abstraction has 224 states and 246 transitions. [2020-07-21 14:10:24,321 INFO L480 AbstractCegarLoop]: Interpolant automaton has 49 states. [2020-07-21 14:10:24,321 INFO L276 IsEmpty]: Start isEmpty. Operand 224 states and 246 transitions. [2020-07-21 14:10:24,323 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 310 [2020-07-21 14:10:24,323 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:10:24,323 INFO L422 BasicCegarLoop]: trace histogram [46, 45, 45, 23, 23, 23, 23, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:10:24,537 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:10:24,538 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:10:24,538 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:10:24,539 INFO L82 PathProgramCache]: Analyzing trace with hash 1208144837, now seen corresponding path program 22 times [2020-07-21 14:10:24,539 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:10:24,540 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [24278199] [2020-07-21 14:10:24,540 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:10:24,645 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:10:24,645 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:10:24,648 INFO L263 TraceCheckSpWp]: Trace formula consists of 586 conjuncts, 53 conjunts are in the unsatisfiable core [2020-07-21 14:10:24,652 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:10:26,053 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:10:26,277 INFO L134 CoverageAnalysis]: Checked inductivity of 5271 backedges. 90 proven. 1221 refuted. 0 times theorem prover too weak. 3960 trivial. 0 not checked. [2020-07-21 14:10:26,277 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:10:26,368 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:10:26,691 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [24278199] [2020-07-21 14:10:26,692 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 14:10:26,692 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51] total 51 [2020-07-21 14:10:26,692 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1301767519] [2020-07-21 14:10:26,693 INFO L459 AbstractCegarLoop]: Interpolant automaton has 51 states [2020-07-21 14:10:26,693 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:10:26,693 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2020-07-21 14:10:26,694 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=244, Invalid=2618, Unknown=0, NotChecked=0, Total=2862 [2020-07-21 14:10:26,694 INFO L87 Difference]: Start difference. First operand 224 states and 246 transitions. Second operand 51 states. [2020-07-21 14:10:30,379 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:10:30,380 INFO L93 Difference]: Finished difference Result 236 states and 259 transitions. [2020-07-21 14:10:30,380 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2020-07-21 14:10:30,381 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 309 [2020-07-21 14:10:30,382 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:10:30,383 INFO L225 Difference]: With dead ends: 236 [2020-07-21 14:10:30,384 INFO L226 Difference]: Without dead ends: 234 [2020-07-21 14:10:30,385 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 346 GetRequests, 266 SyntacticMatches, 3 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2105 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=463, Invalid=5699, Unknown=0, NotChecked=0, Total=6162 [2020-07-21 14:10:30,386 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 234 states. [2020-07-21 14:10:30,404 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 234 to 233. [2020-07-21 14:10:30,405 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 233 states. [2020-07-21 14:10:30,406 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 233 states to 233 states and 256 transitions. [2020-07-21 14:10:30,406 INFO L78 Accepts]: Start accepts. Automaton has 233 states and 256 transitions. Word has length 309 [2020-07-21 14:10:30,406 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:10:30,407 INFO L479 AbstractCegarLoop]: Abstraction has 233 states and 256 transitions. [2020-07-21 14:10:30,407 INFO L480 AbstractCegarLoop]: Interpolant automaton has 51 states. [2020-07-21 14:10:30,407 INFO L276 IsEmpty]: Start isEmpty. Operand 233 states and 256 transitions. [2020-07-21 14:10:30,409 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 323 [2020-07-21 14:10:30,409 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:10:30,409 INFO L422 BasicCegarLoop]: trace histogram [48, 47, 47, 24, 24, 24, 24, 23, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:10:30,625 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:10:30,626 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:10:30,626 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:10:30,627 INFO L82 PathProgramCache]: Analyzing trace with hash 1369009677, now seen corresponding path program 23 times [2020-07-21 14:10:30,627 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:10:30,627 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [514765184] [2020-07-21 14:10:30,628 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:10:30,748 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:10:30,748 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:10:30,752 INFO L263 TraceCheckSpWp]: Trace formula consists of 610 conjuncts, 55 conjunts are in the unsatisfiable core [2020-07-21 14:10:30,757 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:10:32,306 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:10:32,539 INFO L134 CoverageAnalysis]: Checked inductivity of 5752 backedges. 94 proven. 1334 refuted. 0 times theorem prover too weak. 4324 trivial. 0 not checked. [2020-07-21 14:10:32,539 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:10:32,634 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:10:33,021 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [514765184] [2020-07-21 14:10:33,022 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 14:10:33,022 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53] total 53 [2020-07-21 14:10:33,022 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [696298225] [2020-07-21 14:10:33,023 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2020-07-21 14:10:33,023 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:10:33,023 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2020-07-21 14:10:33,024 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=254, Invalid=2826, Unknown=0, NotChecked=0, Total=3080 [2020-07-21 14:10:33,024 INFO L87 Difference]: Start difference. First operand 233 states and 256 transitions. Second operand 53 states. [2020-07-21 14:10:37,567 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:10:37,568 INFO L93 Difference]: Finished difference Result 245 states and 269 transitions. [2020-07-21 14:10:37,569 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2020-07-21 14:10:37,569 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 322 [2020-07-21 14:10:37,569 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:10:37,570 INFO L225 Difference]: With dead ends: 245 [2020-07-21 14:10:37,570 INFO L226 Difference]: Without dead ends: 243 [2020-07-21 14:10:37,572 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 360 GetRequests, 277 SyntacticMatches, 3 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2281 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=482, Invalid=6160, Unknown=0, NotChecked=0, Total=6642 [2020-07-21 14:10:37,573 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 243 states. [2020-07-21 14:10:37,607 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 243 to 242. [2020-07-21 14:10:37,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 242 states. [2020-07-21 14:10:37,609 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 242 states to 242 states and 266 transitions. [2020-07-21 14:10:37,609 INFO L78 Accepts]: Start accepts. Automaton has 242 states and 266 transitions. Word has length 322 [2020-07-21 14:10:37,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:10:37,610 INFO L479 AbstractCegarLoop]: Abstraction has 242 states and 266 transitions. [2020-07-21 14:10:37,610 INFO L480 AbstractCegarLoop]: Interpolant automaton has 53 states. [2020-07-21 14:10:37,610 INFO L276 IsEmpty]: Start isEmpty. Operand 242 states and 266 transitions. [2020-07-21 14:10:37,612 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 336 [2020-07-21 14:10:37,613 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:10:37,613 INFO L422 BasicCegarLoop]: trace histogram [50, 49, 49, 25, 25, 25, 25, 24, 24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:10:37,818 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:10:37,819 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:10:37,819 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:10:37,820 INFO L82 PathProgramCache]: Analyzing trace with hash -43136827, now seen corresponding path program 24 times [2020-07-21 14:10:37,820 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:10:37,820 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [888306957] [2020-07-21 14:10:37,821 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:10:37,932 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:10:37,932 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:10:37,936 INFO L263 TraceCheckSpWp]: Trace formula consists of 634 conjuncts, 57 conjunts are in the unsatisfiable core [2020-07-21 14:10:37,942 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:10:39,616 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:10:39,872 INFO L134 CoverageAnalysis]: Checked inductivity of 6254 backedges. 98 proven. 1452 refuted. 0 times theorem prover too weak. 4704 trivial. 0 not checked. [2020-07-21 14:10:39,873 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:10:39,975 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:10:40,335 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [888306957] [2020-07-21 14:10:40,335 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 14:10:40,335 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55] total 55 [2020-07-21 14:10:40,335 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [317965294] [2020-07-21 14:10:40,336 INFO L459 AbstractCegarLoop]: Interpolant automaton has 55 states [2020-07-21 14:10:40,336 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:10:40,336 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2020-07-21 14:10:40,337 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=264, Invalid=3042, Unknown=0, NotChecked=0, Total=3306 [2020-07-21 14:10:40,337 INFO L87 Difference]: Start difference. First operand 242 states and 266 transitions. Second operand 55 states. [2020-07-21 14:10:44,639 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:10:44,640 INFO L93 Difference]: Finished difference Result 254 states and 279 transitions. [2020-07-21 14:10:44,642 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2020-07-21 14:10:44,643 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 335 [2020-07-21 14:10:44,643 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:10:44,645 INFO L225 Difference]: With dead ends: 254 [2020-07-21 14:10:44,645 INFO L226 Difference]: Without dead ends: 252 [2020-07-21 14:10:44,646 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 374 GetRequests, 288 SyntacticMatches, 3 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2464 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=501, Invalid=6639, Unknown=0, NotChecked=0, Total=7140 [2020-07-21 14:10:44,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 252 states. [2020-07-21 14:10:44,664 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 252 to 251. [2020-07-21 14:10:44,665 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 251 states. [2020-07-21 14:10:44,666 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 251 states to 251 states and 276 transitions. [2020-07-21 14:10:44,666 INFO L78 Accepts]: Start accepts. Automaton has 251 states and 276 transitions. Word has length 335 [2020-07-21 14:10:44,667 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:10:44,667 INFO L479 AbstractCegarLoop]: Abstraction has 251 states and 276 transitions. [2020-07-21 14:10:44,667 INFO L480 AbstractCegarLoop]: Interpolant automaton has 55 states. [2020-07-21 14:10:44,667 INFO L276 IsEmpty]: Start isEmpty. Operand 251 states and 276 transitions. [2020-07-21 14:10:44,669 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 349 [2020-07-21 14:10:44,669 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:10:44,670 INFO L422 BasicCegarLoop]: trace histogram [52, 51, 51, 26, 26, 26, 26, 25, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:10:44,878 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:10:44,879 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:10:44,879 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:10:44,880 INFO L82 PathProgramCache]: Analyzing trace with hash 2053413133, now seen corresponding path program 25 times [2020-07-21 14:10:44,880 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:10:44,880 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [723160718] [2020-07-21 14:10:44,881 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:10:44,988 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:10:44,988 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:10:44,991 INFO L263 TraceCheckSpWp]: Trace formula consists of 658 conjuncts, 59 conjunts are in the unsatisfiable core [2020-07-21 14:10:44,995 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:10:46,792 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:10:47,060 INFO L134 CoverageAnalysis]: Checked inductivity of 6777 backedges. 102 proven. 1575 refuted. 0 times theorem prover too weak. 5100 trivial. 0 not checked. [2020-07-21 14:10:47,060 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:10:47,178 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:10:47,579 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [723160718] [2020-07-21 14:10:47,579 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 14:10:47,579 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57] total 57 [2020-07-21 14:10:47,580 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [60236160] [2020-07-21 14:10:47,581 INFO L459 AbstractCegarLoop]: Interpolant automaton has 57 states [2020-07-21 14:10:47,581 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:10:47,581 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2020-07-21 14:10:47,582 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=274, Invalid=3266, Unknown=0, NotChecked=0, Total=3540 [2020-07-21 14:10:47,582 INFO L87 Difference]: Start difference. First operand 251 states and 276 transitions. Second operand 57 states. [2020-07-21 14:10:52,442 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:10:52,442 INFO L93 Difference]: Finished difference Result 263 states and 289 transitions. [2020-07-21 14:10:52,443 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2020-07-21 14:10:52,444 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 348 [2020-07-21 14:10:52,445 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:10:52,446 INFO L225 Difference]: With dead ends: 263 [2020-07-21 14:10:52,446 INFO L226 Difference]: Without dead ends: 261 [2020-07-21 14:10:52,447 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 388 GetRequests, 299 SyntacticMatches, 3 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2654 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=520, Invalid=7136, Unknown=0, NotChecked=0, Total=7656 [2020-07-21 14:10:52,448 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 261 states. [2020-07-21 14:10:52,464 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 261 to 260. [2020-07-21 14:10:52,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 260 states. [2020-07-21 14:10:52,465 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 260 states to 260 states and 286 transitions. [2020-07-21 14:10:52,465 INFO L78 Accepts]: Start accepts. Automaton has 260 states and 286 transitions. Word has length 348 [2020-07-21 14:10:52,466 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:10:52,466 INFO L479 AbstractCegarLoop]: Abstraction has 260 states and 286 transitions. [2020-07-21 14:10:52,466 INFO L480 AbstractCegarLoop]: Interpolant automaton has 57 states. [2020-07-21 14:10:52,466 INFO L276 IsEmpty]: Start isEmpty. Operand 260 states and 286 transitions. [2020-07-21 14:10:52,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 362 [2020-07-21 14:10:52,469 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:10:52,469 INFO L422 BasicCegarLoop]: trace histogram [54, 53, 53, 27, 27, 27, 27, 26, 26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:10:52,683 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:10:52,684 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:10:52,684 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:10:52,685 INFO L82 PathProgramCache]: Analyzing trace with hash -144671291, now seen corresponding path program 26 times [2020-07-21 14:10:52,685 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:10:52,685 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1997357270] [2020-07-21 14:10:52,685 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:10:52,790 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:10:52,790 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:10:52,794 INFO L263 TraceCheckSpWp]: Trace formula consists of 682 conjuncts, 61 conjunts are in the unsatisfiable core [2020-07-21 14:10:52,799 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:10:54,747 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:10:55,030 INFO L134 CoverageAnalysis]: Checked inductivity of 7321 backedges. 106 proven. 1703 refuted. 0 times theorem prover too weak. 5512 trivial. 0 not checked. [2020-07-21 14:10:55,030 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:10:55,144 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:10:55,533 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1997357270] [2020-07-21 14:10:55,534 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 14:10:55,534 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59] total 59 [2020-07-21 14:10:55,534 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [667379714] [2020-07-21 14:10:55,535 INFO L459 AbstractCegarLoop]: Interpolant automaton has 59 states [2020-07-21 14:10:55,535 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:10:55,535 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2020-07-21 14:10:55,536 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=284, Invalid=3498, Unknown=0, NotChecked=0, Total=3782 [2020-07-21 14:10:55,536 INFO L87 Difference]: Start difference. First operand 260 states and 286 transitions. Second operand 59 states. [2020-07-21 14:11:00,802 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:11:00,802 INFO L93 Difference]: Finished difference Result 272 states and 299 transitions. [2020-07-21 14:11:00,803 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2020-07-21 14:11:00,803 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 361 [2020-07-21 14:11:00,804 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:11:00,806 INFO L225 Difference]: With dead ends: 272 [2020-07-21 14:11:00,806 INFO L226 Difference]: Without dead ends: 270 [2020-07-21 14:11:00,806 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 402 GetRequests, 310 SyntacticMatches, 3 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2851 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=539, Invalid=7651, Unknown=0, NotChecked=0, Total=8190 [2020-07-21 14:11:00,807 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 270 states. [2020-07-21 14:11:00,828 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 270 to 269. [2020-07-21 14:11:00,828 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 269 states. [2020-07-21 14:11:00,829 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 269 states to 269 states and 296 transitions. [2020-07-21 14:11:00,830 INFO L78 Accepts]: Start accepts. Automaton has 269 states and 296 transitions. Word has length 361 [2020-07-21 14:11:00,830 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:11:00,830 INFO L479 AbstractCegarLoop]: Abstraction has 269 states and 296 transitions. [2020-07-21 14:11:00,830 INFO L480 AbstractCegarLoop]: Interpolant automaton has 59 states. [2020-07-21 14:11:00,831 INFO L276 IsEmpty]: Start isEmpty. Operand 269 states and 296 transitions. [2020-07-21 14:11:00,833 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 375 [2020-07-21 14:11:00,833 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:11:00,834 INFO L422 BasicCegarLoop]: trace histogram [56, 55, 55, 28, 28, 28, 28, 27, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:11:01,047 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:11:01,048 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:11:01,048 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:11:01,049 INFO L82 PathProgramCache]: Analyzing trace with hash -1992293363, now seen corresponding path program 27 times [2020-07-21 14:11:01,049 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:11:01,049 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [373657742] [2020-07-21 14:11:01,049 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:11:01,159 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:11:01,159 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:11:01,162 INFO L263 TraceCheckSpWp]: Trace formula consists of 706 conjuncts, 63 conjunts are in the unsatisfiable core [2020-07-21 14:11:01,167 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:11:03,420 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:11:03,721 INFO L134 CoverageAnalysis]: Checked inductivity of 7886 backedges. 110 proven. 1836 refuted. 0 times theorem prover too weak. 5940 trivial. 0 not checked. [2020-07-21 14:11:03,722 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:11:03,848 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:11:04,274 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [373657742] [2020-07-21 14:11:04,274 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 14:11:04,275 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [61] total 61 [2020-07-21 14:11:04,275 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [495090128] [2020-07-21 14:11:04,276 INFO L459 AbstractCegarLoop]: Interpolant automaton has 61 states [2020-07-21 14:11:04,276 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:11:04,277 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2020-07-21 14:11:04,277 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=294, Invalid=3738, Unknown=0, NotChecked=0, Total=4032 [2020-07-21 14:11:04,277 INFO L87 Difference]: Start difference. First operand 269 states and 296 transitions. Second operand 61 states. [2020-07-21 14:11:10,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:11:10,112 INFO L93 Difference]: Finished difference Result 281 states and 309 transitions. [2020-07-21 14:11:10,114 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 88 states. [2020-07-21 14:11:10,114 INFO L78 Accepts]: Start accepts. Automaton has 61 states. Word has length 374 [2020-07-21 14:11:10,115 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:11:10,117 INFO L225 Difference]: With dead ends: 281 [2020-07-21 14:11:10,117 INFO L226 Difference]: Without dead ends: 279 [2020-07-21 14:11:10,118 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 416 GetRequests, 321 SyntacticMatches, 3 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3055 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=558, Invalid=8184, Unknown=0, NotChecked=0, Total=8742 [2020-07-21 14:11:10,119 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 279 states. [2020-07-21 14:11:10,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 279 to 278. [2020-07-21 14:11:10,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 278 states. [2020-07-21 14:11:10,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 278 states to 278 states and 306 transitions. [2020-07-21 14:11:10,140 INFO L78 Accepts]: Start accepts. Automaton has 278 states and 306 transitions. Word has length 374 [2020-07-21 14:11:10,141 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:11:10,141 INFO L479 AbstractCegarLoop]: Abstraction has 278 states and 306 transitions. [2020-07-21 14:11:10,141 INFO L480 AbstractCegarLoop]: Interpolant automaton has 61 states. [2020-07-21 14:11:10,141 INFO L276 IsEmpty]: Start isEmpty. Operand 278 states and 306 transitions. [2020-07-21 14:11:10,144 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 388 [2020-07-21 14:11:10,144 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:11:10,144 INFO L422 BasicCegarLoop]: trace histogram [58, 57, 57, 29, 29, 29, 29, 28, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:11:10,354 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:11:10,355 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:11:10,355 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:11:10,356 INFO L82 PathProgramCache]: Analyzing trace with hash -676662587, now seen corresponding path program 28 times [2020-07-21 14:11:10,356 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:11:10,356 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1557765034] [2020-07-21 14:11:10,356 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:11:10,481 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:11:10,482 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:11:10,487 INFO L263 TraceCheckSpWp]: Trace formula consists of 730 conjuncts, 65 conjunts are in the unsatisfiable core [2020-07-21 14:11:10,493 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:11:13,187 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:11:13,543 INFO L134 CoverageAnalysis]: Checked inductivity of 8472 backedges. 114 proven. 1974 refuted. 0 times theorem prover too weak. 6384 trivial. 0 not checked. [2020-07-21 14:11:13,543 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:11:13,678 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:11:14,134 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1557765034] [2020-07-21 14:11:14,134 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 14:11:14,134 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [63] total 63 [2020-07-21 14:11:14,135 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1158047882] [2020-07-21 14:11:14,136 INFO L459 AbstractCegarLoop]: Interpolant automaton has 63 states [2020-07-21 14:11:14,136 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:11:14,136 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2020-07-21 14:11:14,136 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=304, Invalid=3986, Unknown=0, NotChecked=0, Total=4290 [2020-07-21 14:11:14,136 INFO L87 Difference]: Start difference. First operand 278 states and 306 transitions. Second operand 63 states. [2020-07-21 14:11:20,421 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:11:20,421 INFO L93 Difference]: Finished difference Result 290 states and 319 transitions. [2020-07-21 14:11:20,423 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2020-07-21 14:11:20,423 INFO L78 Accepts]: Start accepts. Automaton has 63 states. Word has length 387 [2020-07-21 14:11:20,424 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:11:20,425 INFO L225 Difference]: With dead ends: 290 [2020-07-21 14:11:20,425 INFO L226 Difference]: Without dead ends: 288 [2020-07-21 14:11:20,426 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 430 GetRequests, 332 SyntacticMatches, 3 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3266 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=577, Invalid=8735, Unknown=0, NotChecked=0, Total=9312 [2020-07-21 14:11:20,427 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 288 states. [2020-07-21 14:11:20,448 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 288 to 287. [2020-07-21 14:11:20,448 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 287 states. [2020-07-21 14:11:20,450 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 287 states to 287 states and 316 transitions. [2020-07-21 14:11:20,450 INFO L78 Accepts]: Start accepts. Automaton has 287 states and 316 transitions. Word has length 387 [2020-07-21 14:11:20,450 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:11:20,451 INFO L479 AbstractCegarLoop]: Abstraction has 287 states and 316 transitions. [2020-07-21 14:11:20,451 INFO L480 AbstractCegarLoop]: Interpolant automaton has 63 states. [2020-07-21 14:11:20,451 INFO L276 IsEmpty]: Start isEmpty. Operand 287 states and 316 transitions. [2020-07-21 14:11:20,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 401 [2020-07-21 14:11:20,454 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:11:20,454 INFO L422 BasicCegarLoop]: trace histogram [60, 59, 59, 30, 30, 30, 30, 29, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:11:20,668 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:11:20,669 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:11:20,669 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:11:20,669 INFO L82 PathProgramCache]: Analyzing trace with hash 1314631437, now seen corresponding path program 29 times [2020-07-21 14:11:20,669 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:11:20,669 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1014069240] [2020-07-21 14:11:20,670 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:11:20,787 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:11:20,787 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:11:20,791 INFO L263 TraceCheckSpWp]: Trace formula consists of 754 conjuncts, 67 conjunts are in the unsatisfiable core [2020-07-21 14:11:20,796 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:11:23,494 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:11:23,847 INFO L134 CoverageAnalysis]: Checked inductivity of 9079 backedges. 118 proven. 2117 refuted. 0 times theorem prover too weak. 6844 trivial. 0 not checked. [2020-07-21 14:11:23,847 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:11:24,008 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:11:24,511 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1014069240] [2020-07-21 14:11:24,512 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 14:11:24,512 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [65] total 65 [2020-07-21 14:11:24,512 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [511310579] [2020-07-21 14:11:24,513 INFO L459 AbstractCegarLoop]: Interpolant automaton has 65 states [2020-07-21 14:11:24,513 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:11:24,513 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2020-07-21 14:11:24,514 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=314, Invalid=4242, Unknown=0, NotChecked=0, Total=4556 [2020-07-21 14:11:24,514 INFO L87 Difference]: Start difference. First operand 287 states and 316 transitions. Second operand 65 states. [2020-07-21 14:11:31,706 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:11:31,706 INFO L93 Difference]: Finished difference Result 299 states and 329 transitions. [2020-07-21 14:11:31,707 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2020-07-21 14:11:31,708 INFO L78 Accepts]: Start accepts. Automaton has 65 states. Word has length 400 [2020-07-21 14:11:31,709 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:11:31,710 INFO L225 Difference]: With dead ends: 299 [2020-07-21 14:11:31,711 INFO L226 Difference]: Without dead ends: 297 [2020-07-21 14:11:31,712 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 444 GetRequests, 343 SyntacticMatches, 3 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3484 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=596, Invalid=9304, Unknown=0, NotChecked=0, Total=9900 [2020-07-21 14:11:31,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 297 states. [2020-07-21 14:11:31,735 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 297 to 296. [2020-07-21 14:11:31,735 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 296 states. [2020-07-21 14:11:31,736 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 296 states to 296 states and 326 transitions. [2020-07-21 14:11:31,736 INFO L78 Accepts]: Start accepts. Automaton has 296 states and 326 transitions. Word has length 400 [2020-07-21 14:11:31,736 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:11:31,736 INFO L479 AbstractCegarLoop]: Abstraction has 296 states and 326 transitions. [2020-07-21 14:11:31,736 INFO L480 AbstractCegarLoop]: Interpolant automaton has 65 states. [2020-07-21 14:11:31,736 INFO L276 IsEmpty]: Start isEmpty. Operand 296 states and 326 transitions. [2020-07-21 14:11:31,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 414 [2020-07-21 14:11:31,739 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:11:31,740 INFO L422 BasicCegarLoop]: trace histogram [62, 61, 61, 31, 31, 31, 31, 30, 30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:11:31,954 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:11:31,955 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:11:31,955 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:11:31,956 INFO L82 PathProgramCache]: Analyzing trace with hash -1675810875, now seen corresponding path program 30 times [2020-07-21 14:11:31,956 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:11:31,956 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [917210723] [2020-07-21 14:11:31,956 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:11:32,074 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:11:32,074 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:11:32,079 INFO L263 TraceCheckSpWp]: Trace formula consists of 778 conjuncts, 69 conjunts are in the unsatisfiable core [2020-07-21 14:11:32,083 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:11:35,041 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:11:35,428 INFO L134 CoverageAnalysis]: Checked inductivity of 9707 backedges. 122 proven. 2265 refuted. 0 times theorem prover too weak. 7320 trivial. 0 not checked. [2020-07-21 14:11:35,428 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:11:35,612 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:11:36,167 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [917210723] [2020-07-21 14:11:36,167 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 14:11:36,167 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [67] total 67 [2020-07-21 14:11:36,168 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1740153173] [2020-07-21 14:11:36,168 INFO L459 AbstractCegarLoop]: Interpolant automaton has 67 states [2020-07-21 14:11:36,168 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:11:36,168 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2020-07-21 14:11:36,169 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=324, Invalid=4506, Unknown=0, NotChecked=0, Total=4830 [2020-07-21 14:11:36,169 INFO L87 Difference]: Start difference. First operand 296 states and 326 transitions. Second operand 67 states. [2020-07-21 14:11:44,198 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:11:44,199 INFO L93 Difference]: Finished difference Result 308 states and 339 transitions. [2020-07-21 14:11:44,200 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 97 states. [2020-07-21 14:11:44,200 INFO L78 Accepts]: Start accepts. Automaton has 67 states. Word has length 413 [2020-07-21 14:11:44,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:11:44,203 INFO L225 Difference]: With dead ends: 308 [2020-07-21 14:11:44,203 INFO L226 Difference]: Without dead ends: 306 [2020-07-21 14:11:44,204 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 458 GetRequests, 354 SyntacticMatches, 3 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3709 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=615, Invalid=9891, Unknown=0, NotChecked=0, Total=10506 [2020-07-21 14:11:44,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 306 states. [2020-07-21 14:11:44,222 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 306 to 305. [2020-07-21 14:11:44,222 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 305 states. [2020-07-21 14:11:44,224 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 305 states to 305 states and 336 transitions. [2020-07-21 14:11:44,224 INFO L78 Accepts]: Start accepts. Automaton has 305 states and 336 transitions. Word has length 413 [2020-07-21 14:11:44,225 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:11:44,225 INFO L479 AbstractCegarLoop]: Abstraction has 305 states and 336 transitions. [2020-07-21 14:11:44,225 INFO L480 AbstractCegarLoop]: Interpolant automaton has 67 states. [2020-07-21 14:11:44,225 INFO L276 IsEmpty]: Start isEmpty. Operand 305 states and 336 transitions. [2020-07-21 14:11:44,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 427 [2020-07-21 14:11:44,228 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:11:44,228 INFO L422 BasicCegarLoop]: trace histogram [64, 63, 63, 32, 32, 32, 32, 31, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:11:44,431 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:11:44,432 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:11:44,432 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:11:44,433 INFO L82 PathProgramCache]: Analyzing trace with hash -1108895219, now seen corresponding path program 31 times [2020-07-21 14:11:44,433 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:11:44,433 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1730119109] [2020-07-21 14:11:44,434 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:11:44,561 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:11:44,562 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:11:44,567 INFO L263 TraceCheckSpWp]: Trace formula consists of 802 conjuncts, 71 conjunts are in the unsatisfiable core [2020-07-21 14:11:44,571 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:11:47,828 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:11:48,248 INFO L134 CoverageAnalysis]: Checked inductivity of 10356 backedges. 126 proven. 2418 refuted. 0 times theorem prover too weak. 7812 trivial. 0 not checked. [2020-07-21 14:11:48,249 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:11:48,441 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:11:49,005 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1730119109] [2020-07-21 14:11:49,006 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 14:11:49,006 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [69] total 69 [2020-07-21 14:11:49,006 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [420993079] [2020-07-21 14:11:49,007 INFO L459 AbstractCegarLoop]: Interpolant automaton has 69 states [2020-07-21 14:11:49,007 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:11:49,007 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2020-07-21 14:11:49,008 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=334, Invalid=4778, Unknown=0, NotChecked=0, Total=5112 [2020-07-21 14:11:49,008 INFO L87 Difference]: Start difference. First operand 305 states and 336 transitions. Second operand 69 states. [2020-07-21 14:11:58,004 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:11:58,005 INFO L93 Difference]: Finished difference Result 317 states and 349 transitions. [2020-07-21 14:11:58,006 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2020-07-21 14:11:58,006 INFO L78 Accepts]: Start accepts. Automaton has 69 states. Word has length 426 [2020-07-21 14:11:58,007 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:11:58,008 INFO L225 Difference]: With dead ends: 317 [2020-07-21 14:11:58,008 INFO L226 Difference]: Without dead ends: 315 [2020-07-21 14:11:58,009 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 472 GetRequests, 365 SyntacticMatches, 3 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3941 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=634, Invalid=10496, Unknown=0, NotChecked=0, Total=11130 [2020-07-21 14:11:58,010 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 315 states. [2020-07-21 14:11:58,031 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 315 to 314. [2020-07-21 14:11:58,031 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 314 states. [2020-07-21 14:11:58,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 314 states to 314 states and 346 transitions. [2020-07-21 14:11:58,033 INFO L78 Accepts]: Start accepts. Automaton has 314 states and 346 transitions. Word has length 426 [2020-07-21 14:11:58,034 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:11:58,034 INFO L479 AbstractCegarLoop]: Abstraction has 314 states and 346 transitions. [2020-07-21 14:11:58,034 INFO L480 AbstractCegarLoop]: Interpolant automaton has 69 states. [2020-07-21 14:11:58,034 INFO L276 IsEmpty]: Start isEmpty. Operand 314 states and 346 transitions. [2020-07-21 14:11:58,037 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 440 [2020-07-21 14:11:58,038 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:11:58,038 INFO L422 BasicCegarLoop]: trace histogram [66, 65, 65, 33, 33, 33, 33, 32, 32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:11:58,253 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:11:58,253 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:11:58,253 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:11:58,254 INFO L82 PathProgramCache]: Analyzing trace with hash -1635312443, now seen corresponding path program 32 times [2020-07-21 14:11:58,254 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:11:58,254 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [145907446] [2020-07-21 14:11:58,254 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 35 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:11:58,404 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:11:58,405 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:11:58,410 INFO L263 TraceCheckSpWp]: Trace formula consists of 826 conjuncts, 73 conjunts are in the unsatisfiable core [2020-07-21 14:11:58,416 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:12:01,930 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:12:02,381 INFO L134 CoverageAnalysis]: Checked inductivity of 11026 backedges. 130 proven. 2576 refuted. 0 times theorem prover too weak. 8320 trivial. 0 not checked. [2020-07-21 14:12:02,381 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:12:02,563 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:12:03,169 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [145907446] [2020-07-21 14:12:03,170 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 14:12:03,170 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [71] total 71 [2020-07-21 14:12:03,170 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1729563122] [2020-07-21 14:12:03,170 INFO L459 AbstractCegarLoop]: Interpolant automaton has 71 states [2020-07-21 14:12:03,171 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:12:03,171 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2020-07-21 14:12:03,171 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=344, Invalid=5058, Unknown=0, NotChecked=0, Total=5402 [2020-07-21 14:12:03,171 INFO L87 Difference]: Start difference. First operand 314 states and 346 transitions. Second operand 71 states. [2020-07-21 14:12:13,259 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:12:13,259 INFO L93 Difference]: Finished difference Result 326 states and 359 transitions. [2020-07-21 14:12:13,261 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 103 states. [2020-07-21 14:12:13,261 INFO L78 Accepts]: Start accepts. Automaton has 71 states. Word has length 439 [2020-07-21 14:12:13,262 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:12:13,264 INFO L225 Difference]: With dead ends: 326 [2020-07-21 14:12:13,264 INFO L226 Difference]: Without dead ends: 324 [2020-07-21 14:12:13,265 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 486 GetRequests, 376 SyntacticMatches, 3 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4180 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=653, Invalid=11119, Unknown=0, NotChecked=0, Total=11772 [2020-07-21 14:12:13,266 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 324 states. [2020-07-21 14:12:13,290 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 324 to 323. [2020-07-21 14:12:13,290 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 323 states. [2020-07-21 14:12:13,292 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 323 states to 323 states and 356 transitions. [2020-07-21 14:12:13,292 INFO L78 Accepts]: Start accepts. Automaton has 323 states and 356 transitions. Word has length 439 [2020-07-21 14:12:13,292 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:12:13,293 INFO L479 AbstractCegarLoop]: Abstraction has 323 states and 356 transitions. [2020-07-21 14:12:13,293 INFO L480 AbstractCegarLoop]: Interpolant automaton has 71 states. [2020-07-21 14:12:13,293 INFO L276 IsEmpty]: Start isEmpty. Operand 323 states and 356 transitions. [2020-07-21 14:12:13,296 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 453 [2020-07-21 14:12:13,296 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:12:13,297 INFO L422 BasicCegarLoop]: trace histogram [68, 67, 67, 34, 34, 34, 34, 33, 33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:12:13,509 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:12:13,510 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:12:13,510 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:12:13,511 INFO L82 PathProgramCache]: Analyzing trace with hash -267139827, now seen corresponding path program 33 times [2020-07-21 14:12:13,511 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:12:13,511 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [70384470] [2020-07-21 14:12:13,512 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:12:13,644 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:12:13,645 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:12:13,648 INFO L263 TraceCheckSpWp]: Trace formula consists of 850 conjuncts, 75 conjunts are in the unsatisfiable core [2020-07-21 14:12:13,653 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:12:17,607 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:12:18,081 INFO L134 CoverageAnalysis]: Checked inductivity of 11717 backedges. 134 proven. 2739 refuted. 0 times theorem prover too weak. 8844 trivial. 0 not checked. [2020-07-21 14:12:18,082 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:12:18,297 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:12:18,944 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [70384470] [2020-07-21 14:12:18,944 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 14:12:18,945 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [73] total 73 [2020-07-21 14:12:18,945 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1820647478] [2020-07-21 14:12:18,946 INFO L459 AbstractCegarLoop]: Interpolant automaton has 73 states [2020-07-21 14:12:18,946 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:12:18,946 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2020-07-21 14:12:18,946 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=354, Invalid=5346, Unknown=0, NotChecked=0, Total=5700 [2020-07-21 14:12:18,947 INFO L87 Difference]: Start difference. First operand 323 states and 356 transitions. Second operand 73 states. [2020-07-21 14:12:30,425 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:12:30,426 INFO L93 Difference]: Finished difference Result 335 states and 369 transitions. [2020-07-21 14:12:30,428 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 106 states. [2020-07-21 14:12:30,428 INFO L78 Accepts]: Start accepts. Automaton has 73 states. Word has length 452 [2020-07-21 14:12:30,429 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:12:30,431 INFO L225 Difference]: With dead ends: 335 [2020-07-21 14:12:30,431 INFO L226 Difference]: Without dead ends: 333 [2020-07-21 14:12:30,432 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 500 GetRequests, 387 SyntacticMatches, 3 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4426 ImplicationChecksByTransitivity, 7.4s TimeCoverageRelationStatistics Valid=672, Invalid=11760, Unknown=0, NotChecked=0, Total=12432 [2020-07-21 14:12:30,433 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 333 states. [2020-07-21 14:12:30,459 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 333 to 332. [2020-07-21 14:12:30,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 332 states. [2020-07-21 14:12:30,460 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 332 states to 332 states and 366 transitions. [2020-07-21 14:12:30,461 INFO L78 Accepts]: Start accepts. Automaton has 332 states and 366 transitions. Word has length 452 [2020-07-21 14:12:30,461 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:12:30,461 INFO L479 AbstractCegarLoop]: Abstraction has 332 states and 366 transitions. [2020-07-21 14:12:30,462 INFO L480 AbstractCegarLoop]: Interpolant automaton has 73 states. [2020-07-21 14:12:30,462 INFO L276 IsEmpty]: Start isEmpty. Operand 332 states and 366 transitions. [2020-07-21 14:12:30,465 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 466 [2020-07-21 14:12:30,465 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:12:30,466 INFO L422 BasicCegarLoop]: trace histogram [70, 69, 69, 35, 35, 35, 35, 34, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:12:30,679 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:12:30,680 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:12:30,680 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:12:30,681 INFO L82 PathProgramCache]: Analyzing trace with hash -1799827003, now seen corresponding path program 34 times [2020-07-21 14:12:30,681 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:12:30,681 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [452813499] [2020-07-21 14:12:30,681 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 37 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:12:30,829 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:12:30,829 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:12:30,834 INFO L263 TraceCheckSpWp]: Trace formula consists of 874 conjuncts, 77 conjunts are in the unsatisfiable core [2020-07-21 14:12:30,838 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:12:35,338 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:12:35,844 INFO L134 CoverageAnalysis]: Checked inductivity of 12429 backedges. 138 proven. 2907 refuted. 0 times theorem prover too weak. 9384 trivial. 0 not checked. [2020-07-21 14:12:35,844 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:12:36,060 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:12:36,763 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [452813499] [2020-07-21 14:12:36,763 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 14:12:36,764 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [75] total 75 [2020-07-21 14:12:36,764 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [703677673] [2020-07-21 14:12:36,764 INFO L459 AbstractCegarLoop]: Interpolant automaton has 75 states [2020-07-21 14:12:36,765 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:12:36,765 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2020-07-21 14:12:36,765 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=364, Invalid=5642, Unknown=0, NotChecked=0, Total=6006 [2020-07-21 14:12:36,765 INFO L87 Difference]: Start difference. First operand 332 states and 366 transitions. Second operand 75 states. [2020-07-21 14:12:50,375 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:12:50,376 INFO L93 Difference]: Finished difference Result 344 states and 379 transitions. [2020-07-21 14:12:50,377 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 109 states. [2020-07-21 14:12:50,378 INFO L78 Accepts]: Start accepts. Automaton has 75 states. Word has length 465 [2020-07-21 14:12:50,378 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:12:50,380 INFO L225 Difference]: With dead ends: 344 [2020-07-21 14:12:50,380 INFO L226 Difference]: Without dead ends: 342 [2020-07-21 14:12:50,381 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 514 GetRequests, 398 SyntacticMatches, 3 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4679 ImplicationChecksByTransitivity, 8.3s TimeCoverageRelationStatistics Valid=691, Invalid=12419, Unknown=0, NotChecked=0, Total=13110 [2020-07-21 14:12:50,382 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 342 states. [2020-07-21 14:12:50,408 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 342 to 341. [2020-07-21 14:12:50,409 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 341 states. [2020-07-21 14:12:50,410 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 341 states to 341 states and 376 transitions. [2020-07-21 14:12:50,410 INFO L78 Accepts]: Start accepts. Automaton has 341 states and 376 transitions. Word has length 465 [2020-07-21 14:12:50,411 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:12:50,411 INFO L479 AbstractCegarLoop]: Abstraction has 341 states and 376 transitions. [2020-07-21 14:12:50,411 INFO L480 AbstractCegarLoop]: Interpolant automaton has 75 states. [2020-07-21 14:12:50,411 INFO L276 IsEmpty]: Start isEmpty. Operand 341 states and 376 transitions. [2020-07-21 14:12:50,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 479 [2020-07-21 14:12:50,415 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:12:50,415 INFO L422 BasicCegarLoop]: trace histogram [72, 71, 71, 36, 36, 36, 36, 35, 35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:12:50,629 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:12:50,630 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:12:50,630 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:12:50,631 INFO L82 PathProgramCache]: Analyzing trace with hash 554709005, now seen corresponding path program 35 times [2020-07-21 14:12:50,631 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:12:50,631 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [281012082] [2020-07-21 14:12:50,632 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 38 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:12:50,766 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:12:50,766 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:12:50,771 INFO L263 TraceCheckSpWp]: Trace formula consists of 898 conjuncts, 79 conjunts are in the unsatisfiable core [2020-07-21 14:12:50,776 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:12:55,684 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:12:56,225 INFO L134 CoverageAnalysis]: Checked inductivity of 13162 backedges. 142 proven. 3080 refuted. 0 times theorem prover too weak. 9940 trivial. 0 not checked. [2020-07-21 14:12:56,225 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:12:56,483 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:12:57,251 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [281012082] [2020-07-21 14:12:57,251 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 14:12:57,252 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [77] total 77 [2020-07-21 14:12:57,252 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1384823783] [2020-07-21 14:12:57,252 INFO L459 AbstractCegarLoop]: Interpolant automaton has 77 states [2020-07-21 14:12:57,253 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:12:57,253 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2020-07-21 14:12:57,253 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=374, Invalid=5946, Unknown=0, NotChecked=0, Total=6320 [2020-07-21 14:12:57,254 INFO L87 Difference]: Start difference. First operand 341 states and 376 transitions. Second operand 77 states. [2020-07-21 14:13:12,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:13:12,337 INFO L93 Difference]: Finished difference Result 353 states and 389 transitions. [2020-07-21 14:13:12,339 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 112 states. [2020-07-21 14:13:12,339 INFO L78 Accepts]: Start accepts. Automaton has 77 states. Word has length 478 [2020-07-21 14:13:12,340 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:13:12,342 INFO L225 Difference]: With dead ends: 353 [2020-07-21 14:13:12,342 INFO L226 Difference]: Without dead ends: 351 [2020-07-21 14:13:12,344 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 528 GetRequests, 409 SyntacticMatches, 3 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4939 ImplicationChecksByTransitivity, 9.0s TimeCoverageRelationStatistics Valid=710, Invalid=13096, Unknown=0, NotChecked=0, Total=13806 [2020-07-21 14:13:12,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 351 states. [2020-07-21 14:13:12,372 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 351 to 350. [2020-07-21 14:13:12,372 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 350 states. [2020-07-21 14:13:12,374 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 350 states to 350 states and 386 transitions. [2020-07-21 14:13:12,374 INFO L78 Accepts]: Start accepts. Automaton has 350 states and 386 transitions. Word has length 478 [2020-07-21 14:13:12,375 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:13:12,375 INFO L479 AbstractCegarLoop]: Abstraction has 350 states and 386 transitions. [2020-07-21 14:13:12,375 INFO L480 AbstractCegarLoop]: Interpolant automaton has 77 states. [2020-07-21 14:13:12,375 INFO L276 IsEmpty]: Start isEmpty. Operand 350 states and 386 transitions. [2020-07-21 14:13:12,398 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 492 [2020-07-21 14:13:12,398 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:13:12,398 INFO L422 BasicCegarLoop]: trace histogram [74, 73, 73, 37, 37, 37, 37, 36, 36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:13:12,599 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:13:12,599 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:13:12,600 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:13:12,601 INFO L82 PathProgramCache]: Analyzing trace with hash -1870510395, now seen corresponding path program 36 times [2020-07-21 14:13:12,601 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:13:12,601 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2011064376] [2020-07-21 14:13:12,601 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 39 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:13:12,747 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:13:12,747 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:13:12,751 INFO L263 TraceCheckSpWp]: Trace formula consists of 922 conjuncts, 81 conjunts are in the unsatisfiable core [2020-07-21 14:13:12,756 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:13:18,059 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:13:18,635 INFO L134 CoverageAnalysis]: Checked inductivity of 13916 backedges. 146 proven. 3258 refuted. 0 times theorem prover too weak. 10512 trivial. 0 not checked. [2020-07-21 14:13:18,636 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:13:18,891 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:13:19,706 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2011064376] [2020-07-21 14:13:19,706 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 14:13:19,706 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [79] total 79 [2020-07-21 14:13:19,706 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1244959616] [2020-07-21 14:13:19,707 INFO L459 AbstractCegarLoop]: Interpolant automaton has 79 states [2020-07-21 14:13:19,707 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:13:19,707 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2020-07-21 14:13:19,708 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=384, Invalid=6258, Unknown=0, NotChecked=0, Total=6642 [2020-07-21 14:13:19,708 INFO L87 Difference]: Start difference. First operand 350 states and 386 transitions. Second operand 79 states. [2020-07-21 14:13:36,492 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:13:36,493 INFO L93 Difference]: Finished difference Result 362 states and 399 transitions. [2020-07-21 14:13:36,495 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 115 states. [2020-07-21 14:13:36,495 INFO L78 Accepts]: Start accepts. Automaton has 79 states. Word has length 491 [2020-07-21 14:13:36,496 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:13:36,498 INFO L225 Difference]: With dead ends: 362 [2020-07-21 14:13:36,498 INFO L226 Difference]: Without dead ends: 360 [2020-07-21 14:13:36,499 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 542 GetRequests, 420 SyntacticMatches, 3 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5206 ImplicationChecksByTransitivity, 9.8s TimeCoverageRelationStatistics Valid=729, Invalid=13791, Unknown=0, NotChecked=0, Total=14520 [2020-07-21 14:13:36,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 360 states. [2020-07-21 14:13:36,522 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 360 to 359. [2020-07-21 14:13:36,523 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 359 states. [2020-07-21 14:13:36,524 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 359 states to 359 states and 396 transitions. [2020-07-21 14:13:36,525 INFO L78 Accepts]: Start accepts. Automaton has 359 states and 396 transitions. Word has length 491 [2020-07-21 14:13:36,525 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:13:36,525 INFO L479 AbstractCegarLoop]: Abstraction has 359 states and 396 transitions. [2020-07-21 14:13:36,525 INFO L480 AbstractCegarLoop]: Interpolant automaton has 79 states. [2020-07-21 14:13:36,526 INFO L276 IsEmpty]: Start isEmpty. Operand 359 states and 396 transitions. [2020-07-21 14:13:36,529 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 505 [2020-07-21 14:13:36,529 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:13:36,530 INFO L422 BasicCegarLoop]: trace histogram [76, 75, 75, 38, 38, 38, 38, 37, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:13:36,745 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:13:36,746 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:13:36,746 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:13:36,746 INFO L82 PathProgramCache]: Analyzing trace with hash -1324557555, now seen corresponding path program 37 times [2020-07-21 14:13:36,746 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:13:36,746 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1793447055] [2020-07-21 14:13:36,746 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 40 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:13:36,890 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:13:36,890 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:13:36,895 INFO L263 TraceCheckSpWp]: Trace formula consists of 946 conjuncts, 83 conjunts are in the unsatisfiable core [2020-07-21 14:13:36,899 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:13:42,770 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:13:43,380 INFO L134 CoverageAnalysis]: Checked inductivity of 14691 backedges. 150 proven. 3441 refuted. 0 times theorem prover too weak. 11100 trivial. 0 not checked. [2020-07-21 14:13:43,381 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:13:43,661 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:13:44,538 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1793447055] [2020-07-21 14:13:44,539 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 14:13:44,539 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [81] total 81 [2020-07-21 14:13:44,539 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1245109213] [2020-07-21 14:13:44,540 INFO L459 AbstractCegarLoop]: Interpolant automaton has 81 states [2020-07-21 14:13:44,540 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:13:44,541 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 81 interpolants. [2020-07-21 14:13:44,541 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=394, Invalid=6578, Unknown=0, NotChecked=0, Total=6972 [2020-07-21 14:13:44,541 INFO L87 Difference]: Start difference. First operand 359 states and 396 transitions. Second operand 81 states. [2020-07-21 14:14:03,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:14:03,747 INFO L93 Difference]: Finished difference Result 371 states and 409 transitions. [2020-07-21 14:14:03,750 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 118 states. [2020-07-21 14:14:03,750 INFO L78 Accepts]: Start accepts. Automaton has 81 states. Word has length 504 [2020-07-21 14:14:03,751 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:14:03,753 INFO L225 Difference]: With dead ends: 371 [2020-07-21 14:14:03,753 INFO L226 Difference]: Without dead ends: 369 [2020-07-21 14:14:03,754 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 556 GetRequests, 431 SyntacticMatches, 3 SemanticMatches, 122 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5480 ImplicationChecksByTransitivity, 10.8s TimeCoverageRelationStatistics Valid=748, Invalid=14504, Unknown=0, NotChecked=0, Total=15252 [2020-07-21 14:14:03,755 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 369 states. [2020-07-21 14:14:03,785 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 369 to 368. [2020-07-21 14:14:03,785 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 368 states. [2020-07-21 14:14:03,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 368 states to 368 states and 406 transitions. [2020-07-21 14:14:03,787 INFO L78 Accepts]: Start accepts. Automaton has 368 states and 406 transitions. Word has length 504 [2020-07-21 14:14:03,788 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:14:03,788 INFO L479 AbstractCegarLoop]: Abstraction has 368 states and 406 transitions. [2020-07-21 14:14:03,788 INFO L480 AbstractCegarLoop]: Interpolant automaton has 81 states. [2020-07-21 14:14:03,788 INFO L276 IsEmpty]: Start isEmpty. Operand 368 states and 406 transitions. [2020-07-21 14:14:03,792 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 518 [2020-07-21 14:14:03,792 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:14:03,792 INFO L422 BasicCegarLoop]: trace histogram [78, 77, 77, 39, 39, 39, 39, 38, 38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:14:04,006 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:04,007 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:14:04,007 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:14:04,007 INFO L82 PathProgramCache]: Analyzing trace with hash -5014587, now seen corresponding path program 38 times [2020-07-21 14:14:04,007 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:14:04,007 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2023894549] [2020-07-21 14:14:04,008 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 41 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:04,157 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:14:04,158 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:14:04,162 INFO L263 TraceCheckSpWp]: Trace formula consists of 970 conjuncts, 85 conjunts are in the unsatisfiable core [2020-07-21 14:14:04,184 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:14:10,585 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:14:11,264 INFO L134 CoverageAnalysis]: Checked inductivity of 15487 backedges. 154 proven. 3629 refuted. 0 times theorem prover too weak. 11704 trivial. 0 not checked. [2020-07-21 14:14:11,265 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:14:11,566 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:14:12,502 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2023894549] [2020-07-21 14:14:12,503 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 14:14:12,503 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [83] total 83 [2020-07-21 14:14:12,503 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [984206487] [2020-07-21 14:14:12,504 INFO L459 AbstractCegarLoop]: Interpolant automaton has 83 states [2020-07-21 14:14:12,504 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:14:12,504 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2020-07-21 14:14:12,504 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=404, Invalid=6906, Unknown=0, NotChecked=0, Total=7310 [2020-07-21 14:14:12,505 INFO L87 Difference]: Start difference. First operand 368 states and 406 transitions. Second operand 83 states. [2020-07-21 14:14:31,940 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:14:31,940 INFO L93 Difference]: Finished difference Result 380 states and 419 transitions. [2020-07-21 14:14:31,942 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 121 states. [2020-07-21 14:14:31,943 INFO L78 Accepts]: Start accepts. Automaton has 83 states. Word has length 517 [2020-07-21 14:14:31,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:14:31,945 INFO L225 Difference]: With dead ends: 380 [2020-07-21 14:14:31,946 INFO L226 Difference]: Without dead ends: 378 [2020-07-21 14:14:31,947 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 570 GetRequests, 442 SyntacticMatches, 3 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5761 ImplicationChecksByTransitivity, 11.6s TimeCoverageRelationStatistics Valid=767, Invalid=15235, Unknown=0, NotChecked=0, Total=16002 [2020-07-21 14:14:31,947 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 378 states. [2020-07-21 14:14:31,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 378 to 377. [2020-07-21 14:14:31,977 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 377 states. [2020-07-21 14:14:31,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 377 states to 377 states and 416 transitions. [2020-07-21 14:14:31,979 INFO L78 Accepts]: Start accepts. Automaton has 377 states and 416 transitions. Word has length 517 [2020-07-21 14:14:31,980 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:14:31,980 INFO L479 AbstractCegarLoop]: Abstraction has 377 states and 416 transitions. [2020-07-21 14:14:31,980 INFO L480 AbstractCegarLoop]: Interpolant automaton has 83 states. [2020-07-21 14:14:31,981 INFO L276 IsEmpty]: Start isEmpty. Operand 377 states and 416 transitions. [2020-07-21 14:14:31,984 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 531 [2020-07-21 14:14:31,985 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:14:31,985 INFO L422 BasicCegarLoop]: trace histogram [80, 79, 79, 40, 40, 40, 40, 39, 39, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:14:32,198 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:32,199 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:14:32,199 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:14:32,199 INFO L82 PathProgramCache]: Analyzing trace with hash 607766029, now seen corresponding path program 39 times [2020-07-21 14:14:32,199 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:14:32,199 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [300139743] [2020-07-21 14:14:32,199 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 42 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:32,355 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:14:32,355 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:14:32,359 INFO L263 TraceCheckSpWp]: Trace formula consists of 994 conjuncts, 87 conjunts are in the unsatisfiable core [2020-07-21 14:14:32,364 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:14:39,077 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:14:39,775 INFO L134 CoverageAnalysis]: Checked inductivity of 16304 backedges. 158 proven. 3822 refuted. 0 times theorem prover too weak. 12324 trivial. 0 not checked. [2020-07-21 14:14:39,775 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:14:40,085 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:14:41,052 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [300139743] [2020-07-21 14:14:41,052 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 14:14:41,053 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [85] total 85 [2020-07-21 14:14:41,053 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [315542197] [2020-07-21 14:14:41,054 INFO L459 AbstractCegarLoop]: Interpolant automaton has 85 states [2020-07-21 14:14:41,054 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:14:41,054 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 85 interpolants. [2020-07-21 14:14:41,055 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=414, Invalid=7242, Unknown=0, NotChecked=0, Total=7656 [2020-07-21 14:14:41,055 INFO L87 Difference]: Start difference. First operand 377 states and 416 transitions. Second operand 85 states. [2020-07-21 14:15:04,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:15:04,972 INFO L93 Difference]: Finished difference Result 389 states and 429 transitions. [2020-07-21 14:15:04,974 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 124 states. [2020-07-21 14:15:04,975 INFO L78 Accepts]: Start accepts. Automaton has 85 states. Word has length 530 [2020-07-21 14:15:04,976 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:15:04,977 INFO L225 Difference]: With dead ends: 389 [2020-07-21 14:15:04,978 INFO L226 Difference]: Without dead ends: 387 [2020-07-21 14:15:04,979 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 584 GetRequests, 453 SyntacticMatches, 3 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6049 ImplicationChecksByTransitivity, 12.7s TimeCoverageRelationStatistics Valid=786, Invalid=15984, Unknown=0, NotChecked=0, Total=16770 [2020-07-21 14:15:04,979 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 387 states. [2020-07-21 14:15:05,005 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 387 to 386. [2020-07-21 14:15:05,005 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 386 states. [2020-07-21 14:15:05,006 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 386 states to 386 states and 426 transitions. [2020-07-21 14:15:05,007 INFO L78 Accepts]: Start accepts. Automaton has 386 states and 426 transitions. Word has length 530 [2020-07-21 14:15:05,007 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:15:05,007 INFO L479 AbstractCegarLoop]: Abstraction has 386 states and 426 transitions. [2020-07-21 14:15:05,007 INFO L480 AbstractCegarLoop]: Interpolant automaton has 85 states. [2020-07-21 14:15:05,007 INFO L276 IsEmpty]: Start isEmpty. Operand 386 states and 426 transitions. [2020-07-21 14:15:05,010 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 544 [2020-07-21 14:15:05,010 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:15:05,011 INFO L422 BasicCegarLoop]: trace histogram [82, 81, 81, 41, 41, 41, 41, 40, 40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:15:05,211 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:15:05,211 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:15:05,212 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:15:05,212 INFO L82 PathProgramCache]: Analyzing trace with hash -1407422267, now seen corresponding path program 40 times [2020-07-21 14:15:05,212 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:15:05,213 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2089959249] [2020-07-21 14:15:05,213 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 43 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:15:05,368 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:15:05,368 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:15:05,374 INFO L263 TraceCheckSpWp]: Trace formula consists of 1018 conjuncts, 89 conjunts are in the unsatisfiable core [2020-07-21 14:15:05,378 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:15:12,788 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:15:13,519 INFO L134 CoverageAnalysis]: Checked inductivity of 17142 backedges. 162 proven. 4020 refuted. 0 times theorem prover too weak. 12960 trivial. 0 not checked. [2020-07-21 14:15:13,519 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:15:13,860 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:15:14,891 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2089959249] [2020-07-21 14:15:14,891 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 14:15:14,892 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [87] total 87 [2020-07-21 14:15:14,892 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [779145605] [2020-07-21 14:15:14,893 INFO L459 AbstractCegarLoop]: Interpolant automaton has 87 states [2020-07-21 14:15:14,893 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:15:14,893 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2020-07-21 14:15:14,894 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=424, Invalid=7586, Unknown=0, NotChecked=0, Total=8010 [2020-07-21 14:15:14,894 INFO L87 Difference]: Start difference. First operand 386 states and 426 transitions. Second operand 87 states. [2020-07-21 14:15:39,781 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:15:39,781 INFO L93 Difference]: Finished difference Result 398 states and 439 transitions. [2020-07-21 14:15:39,784 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 127 states. [2020-07-21 14:15:39,785 INFO L78 Accepts]: Start accepts. Automaton has 87 states. Word has length 543 [2020-07-21 14:15:39,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:15:39,789 INFO L225 Difference]: With dead ends: 398 [2020-07-21 14:15:39,789 INFO L226 Difference]: Without dead ends: 396 [2020-07-21 14:15:39,790 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 598 GetRequests, 464 SyntacticMatches, 3 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6344 ImplicationChecksByTransitivity, 13.5s TimeCoverageRelationStatistics Valid=805, Invalid=16751, Unknown=0, NotChecked=0, Total=17556 [2020-07-21 14:15:39,791 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 396 states. [2020-07-21 14:15:39,820 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 396 to 395. [2020-07-21 14:15:39,820 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 395 states. [2020-07-21 14:15:39,822 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 395 states to 395 states and 436 transitions. [2020-07-21 14:15:39,822 INFO L78 Accepts]: Start accepts. Automaton has 395 states and 436 transitions. Word has length 543 [2020-07-21 14:15:39,823 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:15:39,823 INFO L479 AbstractCegarLoop]: Abstraction has 395 states and 436 transitions. [2020-07-21 14:15:39,823 INFO L480 AbstractCegarLoop]: Interpolant automaton has 87 states. [2020-07-21 14:15:39,823 INFO L276 IsEmpty]: Start isEmpty. Operand 395 states and 436 transitions. [2020-07-21 14:15:39,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 557 [2020-07-21 14:15:39,828 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:15:39,828 INFO L422 BasicCegarLoop]: trace histogram [84, 83, 83, 42, 42, 42, 42, 41, 41, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:15:40,043 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:15:40,044 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:15:40,044 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:15:40,044 INFO L82 PathProgramCache]: Analyzing trace with hash 583463181, now seen corresponding path program 41 times [2020-07-21 14:15:40,044 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:15:40,044 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1956575903] [2020-07-21 14:15:40,045 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 44 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:15:40,204 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:15:40,205 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:15:40,209 INFO L263 TraceCheckSpWp]: Trace formula consists of 1042 conjuncts, 91 conjunts are in the unsatisfiable core [2020-07-21 14:15:40,215 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:15:48,206 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:15:48,985 INFO L134 CoverageAnalysis]: Checked inductivity of 18001 backedges. 166 proven. 4223 refuted. 0 times theorem prover too weak. 13612 trivial. 0 not checked. [2020-07-21 14:15:48,986 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:15:49,348 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:15:50,493 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1956575903] [2020-07-21 14:15:50,493 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 14:15:50,494 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [89] total 89 [2020-07-21 14:15:50,494 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1151477782] [2020-07-21 14:15:50,495 INFO L459 AbstractCegarLoop]: Interpolant automaton has 89 states [2020-07-21 14:15:50,495 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:15:50,496 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2020-07-21 14:15:50,496 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=434, Invalid=7938, Unknown=0, NotChecked=0, Total=8372 [2020-07-21 14:15:50,496 INFO L87 Difference]: Start difference. First operand 395 states and 436 transitions. Second operand 89 states. [2020-07-21 14:16:18,723 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:16:18,724 INFO L93 Difference]: Finished difference Result 407 states and 449 transitions. [2020-07-21 14:16:18,727 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 130 states. [2020-07-21 14:16:18,727 INFO L78 Accepts]: Start accepts. Automaton has 89 states. Word has length 556 [2020-07-21 14:16:18,729 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:16:18,731 INFO L225 Difference]: With dead ends: 407 [2020-07-21 14:16:18,731 INFO L226 Difference]: Without dead ends: 405 [2020-07-21 14:16:18,732 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 612 GetRequests, 475 SyntacticMatches, 3 SemanticMatches, 134 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6646 ImplicationChecksByTransitivity, 14.8s TimeCoverageRelationStatistics Valid=824, Invalid=17536, Unknown=0, NotChecked=0, Total=18360 [2020-07-21 14:16:18,733 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 405 states. [2020-07-21 14:16:18,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 405 to 404. [2020-07-21 14:16:18,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 404 states. [2020-07-21 14:16:18,760 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 404 states to 404 states and 446 transitions. [2020-07-21 14:16:18,760 INFO L78 Accepts]: Start accepts. Automaton has 404 states and 446 transitions. Word has length 556 [2020-07-21 14:16:18,761 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:16:18,761 INFO L479 AbstractCegarLoop]: Abstraction has 404 states and 446 transitions. [2020-07-21 14:16:18,761 INFO L480 AbstractCegarLoop]: Interpolant automaton has 89 states. [2020-07-21 14:16:18,761 INFO L276 IsEmpty]: Start isEmpty. Operand 404 states and 446 transitions. [2020-07-21 14:16:18,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 570 [2020-07-21 14:16:18,765 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:16:18,765 INFO L422 BasicCegarLoop]: trace histogram [86, 85, 85, 43, 43, 43, 43, 42, 42, 42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:16:18,966 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:16:18,966 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:16:18,966 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:16:18,967 INFO L82 PathProgramCache]: Analyzing trace with hash -1148377659, now seen corresponding path program 42 times [2020-07-21 14:16:18,967 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:16:18,967 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1006103443] [2020-07-21 14:16:18,968 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 45 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:16:19,132 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:16:19,132 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:16:19,138 INFO L263 TraceCheckSpWp]: Trace formula consists of 1066 conjuncts, 93 conjunts are in the unsatisfiable core [2020-07-21 14:16:19,143 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:16:28,170 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:16:29,036 INFO L134 CoverageAnalysis]: Checked inductivity of 18881 backedges. 170 proven. 4431 refuted. 0 times theorem prover too weak. 14280 trivial. 0 not checked. [2020-07-21 14:16:29,036 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:16:29,456 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:16:30,707 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1006103443] [2020-07-21 14:16:30,708 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 14:16:30,708 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [91] total 91 [2020-07-21 14:16:30,708 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2108244440] [2020-07-21 14:16:30,709 INFO L459 AbstractCegarLoop]: Interpolant automaton has 91 states [2020-07-21 14:16:30,709 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:16:30,709 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 91 interpolants. [2020-07-21 14:16:30,709 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=444, Invalid=8298, Unknown=0, NotChecked=0, Total=8742 [2020-07-21 14:16:30,709 INFO L87 Difference]: Start difference. First operand 404 states and 446 transitions. Second operand 91 states. [2020-07-21 14:17:03,364 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:17:03,365 INFO L93 Difference]: Finished difference Result 416 states and 459 transitions. [2020-07-21 14:17:03,369 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 133 states. [2020-07-21 14:17:03,369 INFO L78 Accepts]: Start accepts. Automaton has 91 states. Word has length 569 [2020-07-21 14:17:03,370 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:17:03,372 INFO L225 Difference]: With dead ends: 416 [2020-07-21 14:17:03,372 INFO L226 Difference]: Without dead ends: 414 [2020-07-21 14:17:03,374 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 626 GetRequests, 486 SyntacticMatches, 3 SemanticMatches, 137 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6955 ImplicationChecksByTransitivity, 16.6s TimeCoverageRelationStatistics Valid=843, Invalid=18339, Unknown=0, NotChecked=0, Total=19182 [2020-07-21 14:17:03,374 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 414 states. [2020-07-21 14:17:03,398 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 414 to 413. [2020-07-21 14:17:03,398 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 413 states. [2020-07-21 14:17:03,399 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 413 states to 413 states and 456 transitions. [2020-07-21 14:17:03,400 INFO L78 Accepts]: Start accepts. Automaton has 413 states and 456 transitions. Word has length 569 [2020-07-21 14:17:03,400 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:17:03,401 INFO L479 AbstractCegarLoop]: Abstraction has 413 states and 456 transitions. [2020-07-21 14:17:03,401 INFO L480 AbstractCegarLoop]: Interpolant automaton has 91 states. [2020-07-21 14:17:03,401 INFO L276 IsEmpty]: Start isEmpty. Operand 413 states and 456 transitions. [2020-07-21 14:17:03,405 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 583 [2020-07-21 14:17:03,405 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:17:03,405 INFO L422 BasicCegarLoop]: trace histogram [88, 87, 87, 44, 44, 44, 44, 43, 43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:17:03,605 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:17:03,606 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:17:03,606 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:17:03,607 INFO L82 PathProgramCache]: Analyzing trace with hash 2028231693, now seen corresponding path program 43 times [2020-07-21 14:17:03,607 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:17:03,608 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1811170709] [2020-07-21 14:17:03,608 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 46 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:17:03,778 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:17:03,778 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:17:03,783 INFO L263 TraceCheckSpWp]: Trace formula consists of 1090 conjuncts, 95 conjunts are in the unsatisfiable core [2020-07-21 14:17:03,789 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:17:13,809 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:17:14,727 INFO L134 CoverageAnalysis]: Checked inductivity of 19782 backedges. 174 proven. 4644 refuted. 0 times theorem prover too weak. 14964 trivial. 0 not checked. [2020-07-21 14:17:14,727 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:17:15,155 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:17:16,567 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1811170709] [2020-07-21 14:17:16,567 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 14:17:16,568 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [93] total 93 [2020-07-21 14:17:16,568 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1476233651] [2020-07-21 14:17:16,568 INFO L459 AbstractCegarLoop]: Interpolant automaton has 93 states [2020-07-21 14:17:16,568 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:17:16,569 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 93 interpolants. [2020-07-21 14:17:16,569 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=454, Invalid=8666, Unknown=0, NotChecked=0, Total=9120 [2020-07-21 14:17:16,569 INFO L87 Difference]: Start difference. First operand 413 states and 456 transitions. Second operand 93 states. [2020-07-21 14:17:55,207 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:17:55,207 INFO L93 Difference]: Finished difference Result 425 states and 469 transitions. [2020-07-21 14:17:55,212 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 136 states. [2020-07-21 14:17:55,213 INFO L78 Accepts]: Start accepts. Automaton has 93 states. Word has length 582 [2020-07-21 14:17:55,214 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:17:55,215 INFO L225 Difference]: With dead ends: 425 [2020-07-21 14:17:55,216 INFO L226 Difference]: Without dead ends: 423 [2020-07-21 14:17:55,217 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 640 GetRequests, 497 SyntacticMatches, 3 SemanticMatches, 140 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7271 ImplicationChecksByTransitivity, 18.5s TimeCoverageRelationStatistics Valid=862, Invalid=19160, Unknown=0, NotChecked=0, Total=20022 [2020-07-21 14:17:55,217 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 423 states. [2020-07-21 14:17:55,256 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 423 to 422. [2020-07-21 14:17:55,257 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 422 states. [2020-07-21 14:17:55,259 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 422 states to 422 states and 466 transitions. [2020-07-21 14:17:55,259 INFO L78 Accepts]: Start accepts. Automaton has 422 states and 466 transitions. Word has length 582 [2020-07-21 14:17:55,260 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:17:55,260 INFO L479 AbstractCegarLoop]: Abstraction has 422 states and 466 transitions. [2020-07-21 14:17:55,260 INFO L480 AbstractCegarLoop]: Interpolant automaton has 93 states. [2020-07-21 14:17:55,260 INFO L276 IsEmpty]: Start isEmpty. Operand 422 states and 466 transitions. [2020-07-21 14:17:55,266 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 596 [2020-07-21 14:17:55,266 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:17:55,267 INFO L422 BasicCegarLoop]: trace histogram [90, 89, 89, 45, 45, 45, 45, 44, 44, 44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:17:55,480 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:17:55,481 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:17:55,481 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:17:55,481 INFO L82 PathProgramCache]: Analyzing trace with hash -1344955707, now seen corresponding path program 44 times [2020-07-21 14:17:55,482 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:17:55,482 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [24868613] [2020-07-21 14:17:55,482 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 47 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:17:55,661 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:17:55,661 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:17:55,668 INFO L263 TraceCheckSpWp]: Trace formula consists of 1114 conjuncts, 97 conjunts are in the unsatisfiable core [2020-07-21 14:17:55,673 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:18:08,003 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:18:09,090 INFO L134 CoverageAnalysis]: Checked inductivity of 20704 backedges. 178 proven. 4862 refuted. 0 times theorem prover too weak. 15664 trivial. 0 not checked. [2020-07-21 14:18:09,091 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:18:09,675 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:18:11,489 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [24868613] [2020-07-21 14:18:11,489 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 14:18:11,490 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [95] total 95 [2020-07-21 14:18:11,490 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1320956943] [2020-07-21 14:18:11,490 INFO L459 AbstractCegarLoop]: Interpolant automaton has 95 states [2020-07-21 14:18:11,491 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:18:11,491 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 95 interpolants. [2020-07-21 14:18:11,491 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=464, Invalid=9042, Unknown=0, NotChecked=0, Total=9506 [2020-07-21 14:18:11,491 INFO L87 Difference]: Start difference. First operand 422 states and 466 transitions. Second operand 95 states. [2020-07-21 14:19:03,024 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:19:03,024 INFO L93 Difference]: Finished difference Result 434 states and 479 transitions. [2020-07-21 14:19:03,030 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 139 states. [2020-07-21 14:19:03,031 INFO L78 Accepts]: Start accepts. Automaton has 95 states. Word has length 595 [2020-07-21 14:19:03,032 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:19:03,034 INFO L225 Difference]: With dead ends: 434 [2020-07-21 14:19:03,034 INFO L226 Difference]: Without dead ends: 432 [2020-07-21 14:19:03,036 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 654 GetRequests, 508 SyntacticMatches, 3 SemanticMatches, 143 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7594 ImplicationChecksByTransitivity, 23.5s TimeCoverageRelationStatistics Valid=881, Invalid=19999, Unknown=0, NotChecked=0, Total=20880 [2020-07-21 14:19:03,036 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 432 states. [2020-07-21 14:19:03,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 432 to 431. [2020-07-21 14:19:03,079 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 431 states. [2020-07-21 14:19:03,082 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 431 states to 431 states and 476 transitions. [2020-07-21 14:19:03,082 INFO L78 Accepts]: Start accepts. Automaton has 431 states and 476 transitions. Word has length 595 [2020-07-21 14:19:03,083 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:19:03,083 INFO L479 AbstractCegarLoop]: Abstraction has 431 states and 476 transitions. [2020-07-21 14:19:03,083 INFO L480 AbstractCegarLoop]: Interpolant automaton has 95 states. [2020-07-21 14:19:03,083 INFO L276 IsEmpty]: Start isEmpty. Operand 431 states and 476 transitions. [2020-07-21 14:19:03,089 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 609 [2020-07-21 14:19:03,090 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:19:03,090 INFO L422 BasicCegarLoop]: trace histogram [92, 91, 91, 46, 46, 46, 46, 45, 45, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:19:03,303 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:19:03,304 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:19:03,305 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:19:03,305 INFO L82 PathProgramCache]: Analyzing trace with hash 381814541, now seen corresponding path program 45 times [2020-07-21 14:19:03,306 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:19:03,306 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1968879931] [2020-07-21 14:19:03,306 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 48 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:19:03,593 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:19:03,594 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:19:03,608 INFO L263 TraceCheckSpWp]: Trace formula consists of 1138 conjuncts, 99 conjunts are in the unsatisfiable core [2020-07-21 14:19:03,622 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:19:19,345 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:19:20,767 INFO L134 CoverageAnalysis]: Checked inductivity of 21647 backedges. 182 proven. 5085 refuted. 0 times theorem prover too weak. 16380 trivial. 0 not checked. [2020-07-21 14:19:20,768 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:19:21,503 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:19:23,732 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1968879931] [2020-07-21 14:19:23,732 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 14:19:23,732 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [97] total 97 [2020-07-21 14:19:23,733 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1286488374] [2020-07-21 14:19:23,733 INFO L459 AbstractCegarLoop]: Interpolant automaton has 97 states [2020-07-21 14:19:23,734 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:19:23,734 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 97 interpolants. [2020-07-21 14:19:23,735 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=474, Invalid=9426, Unknown=0, NotChecked=0, Total=9900 [2020-07-21 14:19:23,735 INFO L87 Difference]: Start difference. First operand 431 states and 476 transitions. Second operand 97 states. [2020-07-21 14:20:25,587 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:20:25,588 INFO L93 Difference]: Finished difference Result 443 states and 489 transitions. [2020-07-21 14:20:25,594 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 142 states. [2020-07-21 14:20:25,594 INFO L78 Accepts]: Start accepts. Automaton has 97 states. Word has length 608 [2020-07-21 14:20:25,595 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:20:25,597 INFO L225 Difference]: With dead ends: 443 [2020-07-21 14:20:25,598 INFO L226 Difference]: Without dead ends: 441 [2020-07-21 14:20:25,599 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 668 GetRequests, 519 SyntacticMatches, 3 SemanticMatches, 146 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7924 ImplicationChecksByTransitivity, 29.1s TimeCoverageRelationStatistics Valid=900, Invalid=20856, Unknown=0, NotChecked=0, Total=21756 [2020-07-21 14:20:25,600 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 441 states. [2020-07-21 14:20:25,633 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 441 to 440. [2020-07-21 14:20:25,633 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 440 states. [2020-07-21 14:20:25,635 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 440 states to 440 states and 486 transitions. [2020-07-21 14:20:25,635 INFO L78 Accepts]: Start accepts. Automaton has 440 states and 486 transitions. Word has length 608 [2020-07-21 14:20:25,636 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:20:25,636 INFO L479 AbstractCegarLoop]: Abstraction has 440 states and 486 transitions. [2020-07-21 14:20:25,636 INFO L480 AbstractCegarLoop]: Interpolant automaton has 97 states. [2020-07-21 14:20:25,636 INFO L276 IsEmpty]: Start isEmpty. Operand 440 states and 486 transitions. [2020-07-21 14:20:25,640 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 622 [2020-07-21 14:20:25,640 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:20:25,641 INFO L422 BasicCegarLoop]: trace histogram [94, 93, 93, 47, 47, 47, 47, 46, 46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:20:25,841 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:20:25,842 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:20:25,842 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:20:25,843 INFO L82 PathProgramCache]: Analyzing trace with hash 1724239813, now seen corresponding path program 46 times [2020-07-21 14:20:25,843 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:20:25,844 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1455934191] [2020-07-21 14:20:25,844 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 49 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:20:26,051 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:20:26,052 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:20:26,059 INFO L263 TraceCheckSpWp]: Trace formula consists of 1162 conjuncts, 101 conjunts are in the unsatisfiable core [2020-07-21 14:20:26,065 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:20:44,181 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:20:45,558 INFO L134 CoverageAnalysis]: Checked inductivity of 22611 backedges. 186 proven. 5313 refuted. 0 times theorem prover too weak. 17112 trivial. 0 not checked. [2020-07-21 14:20:45,559 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:20:46,377 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:20:48,658 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1455934191] [2020-07-21 14:20:48,659 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 14:20:48,659 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [99] total 99 [2020-07-21 14:20:48,659 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [236992936] [2020-07-21 14:20:48,660 INFO L459 AbstractCegarLoop]: Interpolant automaton has 99 states [2020-07-21 14:20:48,660 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:20:48,661 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 99 interpolants. [2020-07-21 14:20:48,661 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=484, Invalid=9818, Unknown=0, NotChecked=0, Total=10302 [2020-07-21 14:20:48,662 INFO L87 Difference]: Start difference. First operand 440 states and 486 transitions. Second operand 99 states. [2020-07-21 14:21:52,499 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:21:52,499 INFO L93 Difference]: Finished difference Result 452 states and 499 transitions. [2020-07-21 14:21:52,506 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 145 states. [2020-07-21 14:21:52,507 INFO L78 Accepts]: Start accepts. Automaton has 99 states. Word has length 621 [2020-07-21 14:21:52,508 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:21:52,510 INFO L225 Difference]: With dead ends: 452 [2020-07-21 14:21:52,510 INFO L226 Difference]: Without dead ends: 450 [2020-07-21 14:21:52,513 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 682 GetRequests, 530 SyntacticMatches, 3 SemanticMatches, 149 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8261 ImplicationChecksByTransitivity, 32.2s TimeCoverageRelationStatistics Valid=919, Invalid=21731, Unknown=0, NotChecked=0, Total=22650 [2020-07-21 14:21:52,513 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 450 states. [2020-07-21 14:21:52,541 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 450 to 449. [2020-07-21 14:21:52,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 449 states. [2020-07-21 14:21:52,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 449 states to 449 states and 496 transitions. [2020-07-21 14:21:52,543 INFO L78 Accepts]: Start accepts. Automaton has 449 states and 496 transitions. Word has length 621 [2020-07-21 14:21:52,544 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:21:52,544 INFO L479 AbstractCegarLoop]: Abstraction has 449 states and 496 transitions. [2020-07-21 14:21:52,544 INFO L480 AbstractCegarLoop]: Interpolant automaton has 99 states. [2020-07-21 14:21:52,544 INFO L276 IsEmpty]: Start isEmpty. Operand 449 states and 496 transitions. [2020-07-21 14:21:52,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 635 [2020-07-21 14:21:52,549 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:21:52,549 INFO L422 BasicCegarLoop]: trace histogram [96, 95, 95, 48, 48, 48, 48, 47, 47, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:21:52,750 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:21:52,750 INFO L427 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:21:52,751 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:21:52,751 INFO L82 PathProgramCache]: Analyzing trace with hash 277869069, now seen corresponding path program 47 times [2020-07-21 14:21:52,752 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:21:52,752 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1423928897] [2020-07-21 14:21:52,752 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 50 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:21:52,954 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:21:52,955 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:21:52,965 INFO L263 TraceCheckSpWp]: Trace formula consists of 1186 conjuncts, 103 conjunts are in the unsatisfiable core [2020-07-21 14:21:52,977 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:22:11,734 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:22:13,138 INFO L134 CoverageAnalysis]: Checked inductivity of 23596 backedges. 190 proven. 5546 refuted. 0 times theorem prover too weak. 17860 trivial. 0 not checked. [2020-07-21 14:22:13,138 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:22:13,968 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:22:16,452 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1423928897] [2020-07-21 14:22:16,452 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 14:22:16,453 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [101] total 101 [2020-07-21 14:22:16,453 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [671796241] [2020-07-21 14:22:16,454 INFO L459 AbstractCegarLoop]: Interpolant automaton has 101 states [2020-07-21 14:22:16,454 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:22:16,454 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2020-07-21 14:22:16,455 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=494, Invalid=10218, Unknown=0, NotChecked=0, Total=10712 [2020-07-21 14:22:16,455 INFO L87 Difference]: Start difference. First operand 449 states and 496 transitions. Second operand 101 states.