/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 4 -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 [2020-07-20 14:29:25,523 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 14:29:25,525 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 14:29:25,544 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 14:29:25,544 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 14:29:25,546 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 14:29:25,548 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 14:29:25,558 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 14:29:25,563 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 14:29:25,565 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 14:29:25,567 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 14:29:25,569 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 14:29:25,569 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 14:29:25,570 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 14:29:25,572 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 14:29:25,573 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 14:29:25,575 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 14:29:25,576 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 14:29:25,577 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 14:29:25,582 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 14:29:25,587 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 14:29:25,590 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 14:29:25,591 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 14:29:25,591 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 14:29:25,594 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 14:29:25,603 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 14:29:25,603 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 14:29:25,604 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 14:29:25,605 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 14:29:25,639 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 14:29:25,639 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 14:29:25,643 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 14:29:25,643 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 14:29:25,643 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 14:29:25,644 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 14:29:25,644 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 14:29:25,644 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 14:29:25,646 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 14:29:25,646 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 14:29:25,646 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 14:29:25,647 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 14:29:25,647 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 14:29:25,647 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 14:29:25,647 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 14:29:25,648 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 14:29:25,648 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 14:29:25,649 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 14:29:25,649 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 14:29:25,649 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 14:29:25,649 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 14:29:25,649 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 14:29:25,649 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 14:29:25,650 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 14:29:25,650 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 14:29:25,650 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 14:29:25,650 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:29:25,650 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 14:29:25,651 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 14:29:25,651 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 -> 4 [2020-07-20 14:29:25,950 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 14:29:25,963 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 14:29:25,966 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 14:29:25,968 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 14:29:25,968 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 14:29:25,969 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-invgen/MADWiFi-encode_ie_ok.i [2020-07-20 14:29:26,026 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/021c6e08f/fc668356f6344db1b9306fe4a22dc21e/FLAG389fd4f98 [2020-07-20 14:29:26,432 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 14:29:26,433 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-invgen/MADWiFi-encode_ie_ok.i [2020-07-20 14:29:26,439 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/021c6e08f/fc668356f6344db1b9306fe4a22dc21e/FLAG389fd4f98 [2020-07-20 14:29:26,855 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/021c6e08f/fc668356f6344db1b9306fe4a22dc21e [2020-07-20 14:29:26,865 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 14:29:26,868 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 14:29:26,869 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 14:29:26,869 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 14:29:26,873 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 14:29:26,874 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 02:29:26" (1/1) ... [2020-07-20 14:29:26,877 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@36e4754b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:29:26, skipping insertion in model container [2020-07-20 14:29:26,877 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 02:29:26" (1/1) ... [2020-07-20 14:29:26,884 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 14:29:26,908 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 14:29:27,103 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 14:29:27,107 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 14:29:27,126 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 14:29:27,142 INFO L208 MainTranslator]: Completed translation [2020-07-20 14:29:27,143 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:29:27 WrapperNode [2020-07-20 14:29:27,143 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 14:29:27,144 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 14:29:27,144 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 14:29:27,144 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 14:29:27,158 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:29:27" (1/1) ... [2020-07-20 14:29:27,158 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:29:27" (1/1) ... [2020-07-20 14:29:27,164 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:29:27" (1/1) ... [2020-07-20 14:29:27,164 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:29:27" (1/1) ... [2020-07-20 14:29:27,168 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:29:27" (1/1) ... [2020-07-20 14:29:27,173 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:29:27" (1/1) ... [2020-07-20 14:29:27,175 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:29:27" (1/1) ... [2020-07-20 14:29:27,265 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 14:29:27,266 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 14:29:27,266 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 14:29:27,266 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 14:29:27,267 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:29:27" (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 [2020-07-20 14:29:27,335 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 14:29:27,335 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 14:29:27,335 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-20 14:29:27,335 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-20 14:29:27,336 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 14:29:27,336 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 14:29:27,336 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-20 14:29:27,336 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-20 14:29:27,336 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-20 14:29:27,336 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 14:29:27,336 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 14:29:27,336 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 14:29:27,337 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 14:29:27,542 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 14:29:27,542 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-20 14:29:27,546 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 02:29:27 BoogieIcfgContainer [2020-07-20 14:29:27,546 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 14:29:27,547 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 14:29:27,548 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 14:29:27,551 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 14:29:27,551 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 02:29:26" (1/3) ... [2020-07-20 14:29:27,552 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@63b3f875 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 02:29:27, skipping insertion in model container [2020-07-20 14:29:27,552 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:29:27" (2/3) ... [2020-07-20 14:29:27,552 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@63b3f875 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 02:29:27, skipping insertion in model container [2020-07-20 14:29:27,553 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 02:29:27" (3/3) ... [2020-07-20 14:29:27,554 INFO L109 eAbstractionObserver]: Analyzing ICFG MADWiFi-encode_ie_ok.i [2020-07-20 14:29:27,565 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 14:29:27,571 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 14:29:27,595 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 14:29:27,653 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 14:29:27,654 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 14:29:27,654 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 14:29:27,654 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 14:29:27,654 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 14:29:27,655 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 14:29:27,655 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 14:29:27,655 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 14:29:27,682 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states. [2020-07-20 14:29:27,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-20 14:29:27,688 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:29:27,689 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:29:27,690 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:29:27,695 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:29:27,696 INFO L82 PathProgramCache]: Analyzing trace with hash 921445730, now seen corresponding path program 1 times [2020-07-20 14:29:27,706 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:29:27,706 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2109489757] [2020-07-20 14:29:27,707 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:29:27,784 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:29:27,784 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:29:27,787 INFO L263 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 14:29:27,793 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:29:27,857 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:29:27,895 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 14:29:27,896 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 14:29:27,897 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2109489757] [2020-07-20 14:29:27,897 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 14:29:27,898 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-07-20 14:29:27,899 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [689854815] [2020-07-20 14:29:27,903 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-20 14:29:27,903 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:29:27,913 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-20 14:29:27,914 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-07-20 14:29:27,916 INFO L87 Difference]: Start difference. First operand 28 states. Second operand 6 states. [2020-07-20 14:29:28,041 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:29:28,042 INFO L93 Difference]: Finished difference Result 51 states and 67 transitions. [2020-07-20 14:29:28,042 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 14:29:28,044 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 18 [2020-07-20 14:29:28,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:29:28,052 INFO L225 Difference]: With dead ends: 51 [2020-07-20 14:29:28,053 INFO L226 Difference]: Without dead ends: 28 [2020-07-20 14:29:28,057 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 [2020-07-20 14:29:28,074 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-20 14:29:28,093 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-07-20 14:29:28,095 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-07-20 14:29:28,096 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2020-07-20 14:29:28,098 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 18 [2020-07-20 14:29:28,098 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:29:28,098 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2020-07-20 14:29:28,098 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-20 14:29:28,099 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2020-07-20 14:29:28,100 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-20 14:29:28,100 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:29:28,100 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] [2020-07-20 14:29:28,315 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:29:28,315 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:29:28,316 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:29:28,316 INFO L82 PathProgramCache]: Analyzing trace with hash 487181509, now seen corresponding path program 1 times [2020-07-20 14:29:28,317 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:29:28,317 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1513964749] [2020-07-20 14:29:28,318 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:29:28,365 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:29:28,365 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:29:28,366 INFO L263 TraceCheckSpWp]: Trace formula consists of 58 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-20 14:29:28,369 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:29:28,405 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:29:28,435 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 14:29:28,435 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 14:29:28,436 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1513964749] [2020-07-20 14:29:28,436 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 14:29:28,436 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-07-20 14:29:28,437 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1901346295] [2020-07-20 14:29:28,438 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-20 14:29:28,439 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:29:28,439 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-20 14:29:28,439 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-07-20 14:29:28,440 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 6 states. [2020-07-20 14:29:28,508 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:29:28,508 INFO L93 Difference]: Finished difference Result 38 states and 39 transitions. [2020-07-20 14:29:28,509 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 14:29:28,509 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 23 [2020-07-20 14:29:28,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:29:28,512 INFO L225 Difference]: With dead ends: 38 [2020-07-20 14:29:28,512 INFO L226 Difference]: Without dead ends: 36 [2020-07-20 14:29:28,513 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 [2020-07-20 14:29:28,513 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-07-20 14:29:28,524 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-07-20 14:29:28,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-20 14:29:28,526 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2020-07-20 14:29:28,526 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 23 [2020-07-20 14:29:28,526 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:29:28,526 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2020-07-20 14:29:28,527 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-20 14:29:28,527 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2020-07-20 14:29:28,529 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-07-20 14:29:28,529 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:29:28,529 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] [2020-07-20 14:29:28,744 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:29:28,744 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:29:28,745 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:29:28,746 INFO L82 PathProgramCache]: Analyzing trace with hash 258938125, now seen corresponding path program 1 times [2020-07-20 14:29:28,747 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:29:28,747 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1613958229] [2020-07-20 14:29:28,748 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:29:28,802 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:29:28,802 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:29:28,803 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-20 14:29:28,806 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:29:28,882 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:29:28,931 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-20 14:29:28,932 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:29:28,957 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:29:29,073 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1613958229] [2020-07-20 14:29:29,073 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 14:29:29,073 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-07-20 14:29:29,074 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1683643432] [2020-07-20 14:29:29,074 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 14:29:29,075 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:29:29,075 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 14:29:29,075 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2020-07-20 14:29:29,076 INFO L87 Difference]: Start difference. First operand 35 states and 36 transitions. Second operand 9 states. [2020-07-20 14:29:29,220 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:29:29,221 INFO L93 Difference]: Finished difference Result 47 states and 49 transitions. [2020-07-20 14:29:29,221 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 14:29:29,221 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 36 [2020-07-20 14:29:29,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:29:29,223 INFO L225 Difference]: With dead ends: 47 [2020-07-20 14:29:29,223 INFO L226 Difference]: Without dead ends: 45 [2020-07-20 14:29:29,224 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 35 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=64, Invalid=176, Unknown=0, NotChecked=0, Total=240 [2020-07-20 14:29:29,224 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-07-20 14:29:29,232 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 44. [2020-07-20 14:29:29,232 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-07-20 14:29:29,233 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2020-07-20 14:29:29,234 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 36 [2020-07-20 14:29:29,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:29:29,234 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2020-07-20 14:29:29,234 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 14:29:29,235 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2020-07-20 14:29:29,236 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-07-20 14:29:29,236 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:29:29,237 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] [2020-07-20 14:29:29,450 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:29:29,451 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:29:29,451 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:29:29,452 INFO L82 PathProgramCache]: Analyzing trace with hash -801144379, now seen corresponding path program 2 times [2020-07-20 14:29:29,453 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:29:29,453 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2064633167] [2020-07-20 14:29:29,454 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:29:29,502 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:29:29,502 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:29:29,503 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-20 14:29:29,508 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:29:29,608 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:29:29,644 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 10 proven. 11 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-20 14:29:29,644 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:29:29,665 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:29:29,757 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2064633167] [2020-07-20 14:29:29,757 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 14:29:29,757 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-07-20 14:29:29,758 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [710145866] [2020-07-20 14:29:29,758 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 14:29:29,759 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:29:29,759 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 14:29:29,759 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=138, Unknown=0, NotChecked=0, Total=182 [2020-07-20 14:29:29,759 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand 11 states. [2020-07-20 14:29:29,958 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:29:29,958 INFO L93 Difference]: Finished difference Result 56 states and 59 transitions. [2020-07-20 14:29:29,959 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 14:29:29,959 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 49 [2020-07-20 14:29:29,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:29:29,961 INFO L225 Difference]: With dead ends: 56 [2020-07-20 14:29:29,961 INFO L226 Difference]: Without dead ends: 54 [2020-07-20 14:29:29,962 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 [2020-07-20 14:29:29,963 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-07-20 14:29:29,971 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2020-07-20 14:29:29,972 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-07-20 14:29:29,973 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 56 transitions. [2020-07-20 14:29:29,973 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 56 transitions. Word has length 49 [2020-07-20 14:29:29,974 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:29:29,974 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 56 transitions. [2020-07-20 14:29:29,974 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 14:29:29,975 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 56 transitions. [2020-07-20 14:29:29,976 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-07-20 14:29:29,977 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:29:29,977 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] [2020-07-20 14:29:30,191 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:29:30,192 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:29:30,192 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:29:30,193 INFO L82 PathProgramCache]: Analyzing trace with hash -907575283, now seen corresponding path program 3 times [2020-07-20 14:29:30,193 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:29:30,193 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [354130938] [2020-07-20 14:29:30,194 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:29:30,243 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:29:30,244 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:29:30,245 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-20 14:29:30,261 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:29:30,409 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:29:30,445 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 14 proven. 24 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2020-07-20 14:29:30,445 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:29:30,468 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:29:30,578 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [354130938] [2020-07-20 14:29:30,578 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 14:29:30,579 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-07-20 14:29:30,579 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [917490816] [2020-07-20 14:29:30,580 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 14:29:30,580 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:29:30,580 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 14:29:30,581 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=186, Unknown=0, NotChecked=0, Total=240 [2020-07-20 14:29:30,581 INFO L87 Difference]: Start difference. First operand 53 states and 56 transitions. Second operand 13 states. [2020-07-20 14:29:30,872 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:29:30,872 INFO L93 Difference]: Finished difference Result 65 states and 69 transitions. [2020-07-20 14:29:30,873 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-20 14:29:30,874 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 62 [2020-07-20 14:29:30,874 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:29:30,875 INFO L225 Difference]: With dead ends: 65 [2020-07-20 14:29:30,875 INFO L226 Difference]: Without dead ends: 63 [2020-07-20 14:29:30,879 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 [2020-07-20 14:29:30,880 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-07-20 14:29:30,897 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 62. [2020-07-20 14:29:30,897 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2020-07-20 14:29:30,900 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 66 transitions. [2020-07-20 14:29:30,900 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 66 transitions. Word has length 62 [2020-07-20 14:29:30,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:29:30,901 INFO L479 AbstractCegarLoop]: Abstraction has 62 states and 66 transitions. [2020-07-20 14:29:30,902 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 14:29:30,902 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 66 transitions. [2020-07-20 14:29:30,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2020-07-20 14:29:30,903 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:29:30,904 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] [2020-07-20 14:29:31,104 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:29:31,105 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:29:31,105 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:29:31,105 INFO L82 PathProgramCache]: Analyzing trace with hash -1945307451, now seen corresponding path program 4 times [2020-07-20 14:29:31,105 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:29:31,106 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1611711835] [2020-07-20 14:29:31,106 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:29:31,148 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:29:31,148 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:29:31,149 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-20 14:29:31,153 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:29:31,302 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:29:31,345 INFO L134 CoverageAnalysis]: Checked inductivity of 204 backedges. 18 proven. 42 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2020-07-20 14:29:31,345 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:29:31,369 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:29:31,472 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1611711835] [2020-07-20 14:29:31,472 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 14:29:31,472 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-07-20 14:29:31,473 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [622916207] [2020-07-20 14:29:31,473 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 14:29:31,473 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:29:31,473 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 14:29:31,474 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=242, Unknown=0, NotChecked=0, Total=306 [2020-07-20 14:29:31,474 INFO L87 Difference]: Start difference. First operand 62 states and 66 transitions. Second operand 15 states. [2020-07-20 14:29:31,853 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:29:31,853 INFO L93 Difference]: Finished difference Result 74 states and 79 transitions. [2020-07-20 14:29:31,853 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-07-20 14:29:31,854 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 75 [2020-07-20 14:29:31,854 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:29:31,855 INFO L225 Difference]: With dead ends: 74 [2020-07-20 14:29:31,856 INFO L226 Difference]: Without dead ends: 72 [2020-07-20 14:29:31,857 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 68 SyntacticMatches, 3 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 134 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=121, Invalid=479, Unknown=0, NotChecked=0, Total=600 [2020-07-20 14:29:31,857 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-07-20 14:29:31,867 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2020-07-20 14:29:31,867 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-20 14:29:31,868 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 76 transitions. [2020-07-20 14:29:31,869 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 76 transitions. Word has length 75 [2020-07-20 14:29:31,869 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:29:31,869 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 76 transitions. [2020-07-20 14:29:31,869 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 14:29:31,869 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 76 transitions. [2020-07-20 14:29:31,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2020-07-20 14:29:31,871 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:29:31,871 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] [2020-07-20 14:29:32,077 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:29:32,078 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:29:32,079 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:29:32,079 INFO L82 PathProgramCache]: Analyzing trace with hash -1067439347, now seen corresponding path program 5 times [2020-07-20 14:29:32,080 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:29:32,080 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1514395290] [2020-07-20 14:29:32,080 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:29:32,134 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:29:32,134 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:29:32,135 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-20 14:29:32,140 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:29:32,326 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:29:32,373 INFO L134 CoverageAnalysis]: Checked inductivity of 307 backedges. 22 proven. 65 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2020-07-20 14:29:32,373 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:29:32,399 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:29:32,515 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1514395290] [2020-07-20 14:29:32,515 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 14:29:32,515 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-07-20 14:29:32,515 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [43726606] [2020-07-20 14:29:32,516 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 14:29:32,516 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:29:32,517 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 14:29:32,517 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=306, Unknown=0, NotChecked=0, Total=380 [2020-07-20 14:29:32,517 INFO L87 Difference]: Start difference. First operand 71 states and 76 transitions. Second operand 17 states. [2020-07-20 14:29:32,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:29:32,963 INFO L93 Difference]: Finished difference Result 83 states and 89 transitions. [2020-07-20 14:29:32,964 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-07-20 14:29:32,964 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 88 [2020-07-20 14:29:32,965 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:29:32,965 INFO L225 Difference]: With dead ends: 83 [2020-07-20 14:29:32,966 INFO L226 Difference]: Without dead ends: 81 [2020-07-20 14:29:32,967 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 [2020-07-20 14:29:32,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2020-07-20 14:29:32,983 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 80. [2020-07-20 14:29:32,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2020-07-20 14:29:32,987 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 86 transitions. [2020-07-20 14:29:32,987 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 86 transitions. Word has length 88 [2020-07-20 14:29:32,989 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:29:32,990 INFO L479 AbstractCegarLoop]: Abstraction has 80 states and 86 transitions. [2020-07-20 14:29:32,990 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 14:29:32,990 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 86 transitions. [2020-07-20 14:29:32,993 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2020-07-20 14:29:32,993 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:29:32,993 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] [2020-07-20 14:29:33,194 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:29:33,195 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:29:33,195 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:29:33,196 INFO L82 PathProgramCache]: Analyzing trace with hash -29217851, now seen corresponding path program 6 times [2020-07-20 14:29:33,196 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:29:33,197 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [863629645] [2020-07-20 14:29:33,197 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:29:33,242 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:29:33,242 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:29:33,243 INFO L263 TraceCheckSpWp]: Trace formula consists of 202 conjuncts, 21 conjunts are in the unsatisfiable core [2020-07-20 14:29:33,246 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:29:33,488 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:29:33,546 INFO L134 CoverageAnalysis]: Checked inductivity of 431 backedges. 26 proven. 93 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2020-07-20 14:29:33,546 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:29:33,576 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:29:33,690 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [863629645] [2020-07-20 14:29:33,691 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 14:29:33,691 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-07-20 14:29:33,691 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [6586323] [2020-07-20 14:29:33,692 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 14:29:33,694 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:29:33,695 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 14:29:33,696 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=378, Unknown=0, NotChecked=0, Total=462 [2020-07-20 14:29:33,696 INFO L87 Difference]: Start difference. First operand 80 states and 86 transitions. Second operand 19 states. [2020-07-20 14:29:34,238 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:29:34,238 INFO L93 Difference]: Finished difference Result 92 states and 99 transitions. [2020-07-20 14:29:34,239 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-07-20 14:29:34,239 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 101 [2020-07-20 14:29:34,239 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:29:34,240 INFO L225 Difference]: With dead ends: 92 [2020-07-20 14:29:34,241 INFO L226 Difference]: Without dead ends: 90 [2020-07-20 14:29:34,242 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 [2020-07-20 14:29:34,242 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-07-20 14:29:34,260 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2020-07-20 14:29:34,260 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-07-20 14:29:34,261 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 96 transitions. [2020-07-20 14:29:34,261 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 96 transitions. Word has length 101 [2020-07-20 14:29:34,262 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:29:34,262 INFO L479 AbstractCegarLoop]: Abstraction has 89 states and 96 transitions. [2020-07-20 14:29:34,262 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 14:29:34,262 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 96 transitions. [2020-07-20 14:29:34,267 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2020-07-20 14:29:34,268 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:29:34,268 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] [2020-07-20 14:29:34,483 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:29:34,484 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:29:34,485 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:29:34,485 INFO L82 PathProgramCache]: Analyzing trace with hash 923342349, now seen corresponding path program 7 times [2020-07-20 14:29:34,485 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:29:34,486 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2037054344] [2020-07-20 14:29:34,486 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:29:34,531 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:29:34,532 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:29:34,533 INFO L263 TraceCheckSpWp]: Trace formula consists of 226 conjuncts, 23 conjunts are in the unsatisfiable core [2020-07-20 14:29:34,536 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:29:34,757 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:29:34,810 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 30 proven. 126 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2020-07-20 14:29:34,810 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:29:34,846 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:29:34,968 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2037054344] [2020-07-20 14:29:34,969 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 14:29:34,969 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-07-20 14:29:34,969 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1597452069] [2020-07-20 14:29:34,970 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 14:29:34,970 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:29:34,970 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 14:29:34,971 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=458, Unknown=0, NotChecked=0, Total=552 [2020-07-20 14:29:34,971 INFO L87 Difference]: Start difference. First operand 89 states and 96 transitions. Second operand 21 states. [2020-07-20 14:29:35,593 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:29:35,593 INFO L93 Difference]: Finished difference Result 101 states and 109 transitions. [2020-07-20 14:29:35,594 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-07-20 14:29:35,594 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 114 [2020-07-20 14:29:35,595 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:29:35,596 INFO L225 Difference]: With dead ends: 101 [2020-07-20 14:29:35,596 INFO L226 Difference]: Without dead ends: 99 [2020-07-20 14:29:35,597 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 101 SyntacticMatches, 3 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 305 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=178, Invalid=944, Unknown=0, NotChecked=0, Total=1122 [2020-07-20 14:29:35,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2020-07-20 14:29:35,608 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 98. [2020-07-20 14:29:35,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 98 states. [2020-07-20 14:29:35,609 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 106 transitions. [2020-07-20 14:29:35,609 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 106 transitions. Word has length 114 [2020-07-20 14:29:35,609 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:29:35,610 INFO L479 AbstractCegarLoop]: Abstraction has 98 states and 106 transitions. [2020-07-20 14:29:35,610 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 14:29:35,610 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 106 transitions. [2020-07-20 14:29:35,611 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2020-07-20 14:29:35,611 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:29:35,611 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] [2020-07-20 14:29:35,824 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:29:35,825 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:29:35,825 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:29:35,826 INFO L82 PathProgramCache]: Analyzing trace with hash 816783557, now seen corresponding path program 8 times [2020-07-20 14:29:35,826 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:29:35,827 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1919436584] [2020-07-20 14:29:35,827 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:29:35,879 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:29:35,879 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:29:35,880 INFO L263 TraceCheckSpWp]: Trace formula consists of 250 conjuncts, 25 conjunts are in the unsatisfiable core [2020-07-20 14:29:35,884 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:29:36,178 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:29:36,236 INFO L134 CoverageAnalysis]: Checked inductivity of 742 backedges. 34 proven. 164 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2020-07-20 14:29:36,236 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:29:36,272 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:29:36,411 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1919436584] [2020-07-20 14:29:36,412 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 14:29:36,412 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-07-20 14:29:36,412 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [281060888] [2020-07-20 14:29:36,413 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 14:29:36,413 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:29:36,413 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 14:29:36,413 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=546, Unknown=0, NotChecked=0, Total=650 [2020-07-20 14:29:36,414 INFO L87 Difference]: Start difference. First operand 98 states and 106 transitions. Second operand 23 states. [2020-07-20 14:29:37,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:29:37,128 INFO L93 Difference]: Finished difference Result 110 states and 119 transitions. [2020-07-20 14:29:37,128 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-07-20 14:29:37,128 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 127 [2020-07-20 14:29:37,129 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:29:37,130 INFO L225 Difference]: With dead ends: 110 [2020-07-20 14:29:37,130 INFO L226 Difference]: Without dead ends: 108 [2020-07-20 14:29:37,132 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 [2020-07-20 14:29:37,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-07-20 14:29:37,143 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 107. [2020-07-20 14:29:37,143 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-07-20 14:29:37,144 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 116 transitions. [2020-07-20 14:29:37,144 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 116 transitions. Word has length 127 [2020-07-20 14:29:37,145 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:29:37,145 INFO L479 AbstractCegarLoop]: Abstraction has 107 states and 116 transitions. [2020-07-20 14:29:37,145 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 14:29:37,145 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 116 transitions. [2020-07-20 14:29:37,146 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2020-07-20 14:29:37,146 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:29:37,146 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] [2020-07-20 14:29:37,359 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:29:37,360 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:29:37,361 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:29:37,361 INFO L82 PathProgramCache]: Analyzing trace with hash -1777188595, now seen corresponding path program 9 times [2020-07-20 14:29:37,362 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:29:37,362 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [75484783] [2020-07-20 14:29:37,362 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:29:37,413 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:29:37,413 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:29:37,415 INFO L263 TraceCheckSpWp]: Trace formula consists of 274 conjuncts, 27 conjunts are in the unsatisfiable core [2020-07-20 14:29:37,417 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:29:37,717 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:29:37,800 INFO L134 CoverageAnalysis]: Checked inductivity of 929 backedges. 38 proven. 207 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2020-07-20 14:29:37,800 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:29:37,833 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:29:37,963 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [75484783] [2020-07-20 14:29:37,963 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 14:29:37,964 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-07-20 14:29:37,964 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1265097740] [2020-07-20 14:29:37,964 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 14:29:37,964 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:29:37,965 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 14:29:37,965 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=642, Unknown=0, NotChecked=0, Total=756 [2020-07-20 14:29:37,965 INFO L87 Difference]: Start difference. First operand 107 states and 116 transitions. Second operand 25 states. [2020-07-20 14:29:38,786 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:29:38,786 INFO L93 Difference]: Finished difference Result 119 states and 129 transitions. [2020-07-20 14:29:38,787 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-07-20 14:29:38,787 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 140 [2020-07-20 14:29:38,788 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:29:38,789 INFO L225 Difference]: With dead ends: 119 [2020-07-20 14:29:38,789 INFO L226 Difference]: Without dead ends: 117 [2020-07-20 14:29:38,790 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 123 SyntacticMatches, 3 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 454 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=216, Invalid=1344, Unknown=0, NotChecked=0, Total=1560 [2020-07-20 14:29:38,790 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2020-07-20 14:29:38,799 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 116. [2020-07-20 14:29:38,799 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 116 states. [2020-07-20 14:29:38,800 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 126 transitions. [2020-07-20 14:29:38,800 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 126 transitions. Word has length 140 [2020-07-20 14:29:38,801 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:29:38,801 INFO L479 AbstractCegarLoop]: Abstraction has 116 states and 126 transitions. [2020-07-20 14:29:38,801 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 14:29:38,801 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 126 transitions. [2020-07-20 14:29:38,803 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2020-07-20 14:29:38,803 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:29:38,803 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] [2020-07-20 14:29:39,017 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:29:39,018 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:29:39,019 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:29:39,019 INFO L82 PathProgramCache]: Analyzing trace with hash -1994140219, now seen corresponding path program 10 times [2020-07-20 14:29:39,019 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:29:39,020 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [467196349] [2020-07-20 14:29:39,020 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:29:39,088 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:29:39,089 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:29:39,090 INFO L263 TraceCheckSpWp]: Trace formula consists of 298 conjuncts, 29 conjunts are in the unsatisfiable core [2020-07-20 14:29:39,093 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:29:39,459 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:29:39,539 INFO L134 CoverageAnalysis]: Checked inductivity of 1137 backedges. 42 proven. 255 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2020-07-20 14:29:39,539 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:29:39,575 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:29:39,722 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [467196349] [2020-07-20 14:29:39,722 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 14:29:39,722 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-07-20 14:29:39,723 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2075620930] [2020-07-20 14:29:39,723 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-20 14:29:39,723 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:29:39,723 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-20 14:29:39,724 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=746, Unknown=0, NotChecked=0, Total=870 [2020-07-20 14:29:39,724 INFO L87 Difference]: Start difference. First operand 116 states and 126 transitions. Second operand 27 states. [2020-07-20 14:29:40,648 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:29:40,649 INFO L93 Difference]: Finished difference Result 128 states and 139 transitions. [2020-07-20 14:29:40,649 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-07-20 14:29:40,649 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 153 [2020-07-20 14:29:40,650 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:29:40,651 INFO L225 Difference]: With dead ends: 128 [2020-07-20 14:29:40,651 INFO L226 Difference]: Without dead ends: 126 [2020-07-20 14:29:40,652 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 134 SyntacticMatches, 3 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 539 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=235, Invalid=1571, Unknown=0, NotChecked=0, Total=1806 [2020-07-20 14:29:40,652 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2020-07-20 14:29:40,665 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 125. [2020-07-20 14:29:40,665 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 125 states. [2020-07-20 14:29:40,666 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 136 transitions. [2020-07-20 14:29:40,667 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 136 transitions. Word has length 153 [2020-07-20 14:29:40,670 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:29:40,671 INFO L479 AbstractCegarLoop]: Abstraction has 125 states and 136 transitions. [2020-07-20 14:29:40,671 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-20 14:29:40,671 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 136 transitions. [2020-07-20 14:29:40,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 167 [2020-07-20 14:29:40,673 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:29:40,673 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] [2020-07-20 14:29:40,886 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:29:40,887 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:29:40,888 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:29:40,888 INFO L82 PathProgramCache]: Analyzing trace with hash 1772858381, now seen corresponding path program 11 times [2020-07-20 14:29:40,888 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:29:40,889 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [959263897] [2020-07-20 14:29:40,889 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 14:29:40,945 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:29:40,946 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:29:40,948 INFO L263 TraceCheckSpWp]: Trace formula consists of 322 conjuncts, 31 conjunts are in the unsatisfiable core [2020-07-20 14:29:40,951 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:29:41,351 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:29:41,463 INFO L134 CoverageAnalysis]: Checked inductivity of 1366 backedges. 46 proven. 308 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2020-07-20 14:29:41,464 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:29:41,507 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:29:41,673 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [959263897] [2020-07-20 14:29:41,673 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 14:29:41,674 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-07-20 14:29:41,674 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1171717181] [2020-07-20 14:29:41,674 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-20 14:29:41,674 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:29:41,675 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-20 14:29:41,675 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=858, Unknown=0, NotChecked=0, Total=992 [2020-07-20 14:29:41,675 INFO L87 Difference]: Start difference. First operand 125 states and 136 transitions. Second operand 29 states. [2020-07-20 14:29:42,703 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:29:42,704 INFO L93 Difference]: Finished difference Result 137 states and 149 transitions. [2020-07-20 14:29:42,704 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-07-20 14:29:42,704 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 166 [2020-07-20 14:29:42,705 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:29:42,707 INFO L225 Difference]: With dead ends: 137 [2020-07-20 14:29:42,707 INFO L226 Difference]: Without dead ends: 135 [2020-07-20 14:29:42,709 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 145 SyntacticMatches, 3 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 631 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=254, Invalid=1816, Unknown=0, NotChecked=0, Total=2070 [2020-07-20 14:29:42,709 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2020-07-20 14:29:42,718 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 134. [2020-07-20 14:29:42,718 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 134 states. [2020-07-20 14:29:42,719 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 146 transitions. [2020-07-20 14:29:42,720 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 146 transitions. Word has length 166 [2020-07-20 14:29:42,720 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:29:42,720 INFO L479 AbstractCegarLoop]: Abstraction has 134 states and 146 transitions. [2020-07-20 14:29:42,721 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-20 14:29:42,721 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 146 transitions. [2020-07-20 14:29:42,723 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 180 [2020-07-20 14:29:42,723 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:29:42,723 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] [2020-07-20 14:29:42,932 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:29:42,933 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:29:42,933 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:29:42,934 INFO L82 PathProgramCache]: Analyzing trace with hash -915387707, now seen corresponding path program 12 times [2020-07-20 14:29:42,934 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:29:42,935 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1345549987] [2020-07-20 14:29:42,935 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 14:29:43,001 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:29:43,001 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:29:43,005 INFO L263 TraceCheckSpWp]: Trace formula consists of 346 conjuncts, 33 conjunts are in the unsatisfiable core [2020-07-20 14:29:43,011 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:29:43,446 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:29:43,531 INFO L134 CoverageAnalysis]: Checked inductivity of 1616 backedges. 50 proven. 366 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2020-07-20 14:29:43,531 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:29:43,573 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:29:43,741 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1345549987] [2020-07-20 14:29:43,741 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 14:29:43,742 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-07-20 14:29:43,742 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [637983392] [2020-07-20 14:29:43,743 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-07-20 14:29:43,743 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:29:43,743 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-07-20 14:29:43,744 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=978, Unknown=0, NotChecked=0, Total=1122 [2020-07-20 14:29:43,744 INFO L87 Difference]: Start difference. First operand 134 states and 146 transitions. Second operand 31 states. [2020-07-20 14:29:45,224 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:29:45,225 INFO L93 Difference]: Finished difference Result 146 states and 159 transitions. [2020-07-20 14:29:45,225 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-07-20 14:29:45,225 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 179 [2020-07-20 14:29:45,226 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:29:45,227 INFO L225 Difference]: With dead ends: 146 [2020-07-20 14:29:45,227 INFO L226 Difference]: Without dead ends: 144 [2020-07-20 14:29:45,229 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 [2020-07-20 14:29:45,230 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2020-07-20 14:29:45,244 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 143. [2020-07-20 14:29:45,244 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 143 states. [2020-07-20 14:29:45,247 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 156 transitions. [2020-07-20 14:29:45,247 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 156 transitions. Word has length 179 [2020-07-20 14:29:45,248 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:29:45,248 INFO L479 AbstractCegarLoop]: Abstraction has 143 states and 156 transitions. [2020-07-20 14:29:45,248 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-07-20 14:29:45,248 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 156 transitions. [2020-07-20 14:29:45,250 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 193 [2020-07-20 14:29:45,250 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:29:45,251 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] [2020-07-20 14:29:45,465 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:29:45,466 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:29:45,466 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:29:45,466 INFO L82 PathProgramCache]: Analyzing trace with hash 1644517133, now seen corresponding path program 13 times [2020-07-20 14:29:45,466 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:29:45,466 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [655027789] [2020-07-20 14:29:45,467 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 14:29:45,532 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:29:45,533 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:29:45,534 INFO L263 TraceCheckSpWp]: Trace formula consists of 370 conjuncts, 35 conjunts are in the unsatisfiable core [2020-07-20 14:29:45,538 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:29:46,045 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:29:46,140 INFO L134 CoverageAnalysis]: Checked inductivity of 1887 backedges. 54 proven. 429 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2020-07-20 14:29:46,141 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:29:46,190 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:29:46,370 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [655027789] [2020-07-20 14:29:46,370 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 14:29:46,371 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-07-20 14:29:46,371 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1399938137] [2020-07-20 14:29:46,372 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-07-20 14:29:46,372 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:29:46,372 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-07-20 14:29:46,373 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=154, Invalid=1106, Unknown=0, NotChecked=0, Total=1260 [2020-07-20 14:29:46,373 INFO L87 Difference]: Start difference. First operand 143 states and 156 transitions. Second operand 33 states. [2020-07-20 14:29:47,725 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:29:47,726 INFO L93 Difference]: Finished difference Result 155 states and 169 transitions. [2020-07-20 14:29:47,726 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-07-20 14:29:47,726 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 192 [2020-07-20 14:29:47,727 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:29:47,728 INFO L225 Difference]: With dead ends: 155 [2020-07-20 14:29:47,728 INFO L226 Difference]: Without dead ends: 153 [2020-07-20 14:29:47,730 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 220 GetRequests, 167 SyntacticMatches, 3 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 836 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=292, Invalid=2360, Unknown=0, NotChecked=0, Total=2652 [2020-07-20 14:29:47,730 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 153 states. [2020-07-20 14:29:47,743 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 153 to 152. [2020-07-20 14:29:47,743 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 152 states. [2020-07-20 14:29:47,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 166 transitions. [2020-07-20 14:29:47,745 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 166 transitions. Word has length 192 [2020-07-20 14:29:47,745 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:29:47,746 INFO L479 AbstractCegarLoop]: Abstraction has 152 states and 166 transitions. [2020-07-20 14:29:47,746 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-07-20 14:29:47,746 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 166 transitions. [2020-07-20 14:29:47,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 206 [2020-07-20 14:29:47,748 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:29:47,748 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] [2020-07-20 14:29:47,961 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:29:47,962 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:29:47,962 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:29:47,962 INFO L82 PathProgramCache]: Analyzing trace with hash 258244549, now seen corresponding path program 14 times [2020-07-20 14:29:47,962 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:29:47,962 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1223410492] [2020-07-20 14:29:47,963 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 14:29:48,026 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:29:48,026 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:29:48,028 INFO L263 TraceCheckSpWp]: Trace formula consists of 394 conjuncts, 37 conjunts are in the unsatisfiable core [2020-07-20 14:29:48,037 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:29:48,633 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:29:48,746 INFO L134 CoverageAnalysis]: Checked inductivity of 2179 backedges. 58 proven. 497 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2020-07-20 14:29:48,746 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:29:48,795 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:29:48,971 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1223410492] [2020-07-20 14:29:48,972 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 14:29:48,972 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-07-20 14:29:48,973 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1415911347] [2020-07-20 14:29:48,973 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-07-20 14:29:48,974 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:29:48,974 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-07-20 14:29:48,974 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=164, Invalid=1242, Unknown=0, NotChecked=0, Total=1406 [2020-07-20 14:29:48,975 INFO L87 Difference]: Start difference. First operand 152 states and 166 transitions. Second operand 35 states. [2020-07-20 14:29:50,521 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:29:50,521 INFO L93 Difference]: Finished difference Result 164 states and 179 transitions. [2020-07-20 14:29:50,521 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2020-07-20 14:29:50,522 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 205 [2020-07-20 14:29:50,522 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:29:50,524 INFO L225 Difference]: With dead ends: 164 [2020-07-20 14:29:50,524 INFO L226 Difference]: Without dead ends: 162 [2020-07-20 14:29:50,526 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 234 GetRequests, 178 SyntacticMatches, 3 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 949 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=311, Invalid=2659, Unknown=0, NotChecked=0, Total=2970 [2020-07-20 14:29:50,526 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2020-07-20 14:29:50,536 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 161. [2020-07-20 14:29:50,537 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 161 states. [2020-07-20 14:29:50,538 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 161 states to 161 states and 176 transitions. [2020-07-20 14:29:50,538 INFO L78 Accepts]: Start accepts. Automaton has 161 states and 176 transitions. Word has length 205 [2020-07-20 14:29:50,538 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:29:50,539 INFO L479 AbstractCegarLoop]: Abstraction has 161 states and 176 transitions. [2020-07-20 14:29:50,539 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-07-20 14:29:50,539 INFO L276 IsEmpty]: Start isEmpty. Operand 161 states and 176 transitions. [2020-07-20 14:29:50,542 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 219 [2020-07-20 14:29:50,542 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:29:50,542 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] [2020-07-20 14:29:50,757 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:29:50,757 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:29:50,758 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:29:50,758 INFO L82 PathProgramCache]: Analyzing trace with hash 1397703181, now seen corresponding path program 15 times [2020-07-20 14:29:50,758 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:29:50,759 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1610087424] [2020-07-20 14:29:50,759 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 14:29:50,831 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:29:50,832 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:29:50,834 INFO L263 TraceCheckSpWp]: Trace formula consists of 418 conjuncts, 39 conjunts are in the unsatisfiable core [2020-07-20 14:29:50,838 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:29:51,444 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:29:51,573 INFO L134 CoverageAnalysis]: Checked inductivity of 2492 backedges. 62 proven. 570 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2020-07-20 14:29:51,573 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:29:51,624 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:29:51,822 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1610087424] [2020-07-20 14:29:51,822 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 14:29:51,822 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-07-20 14:29:51,823 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1286842117] [2020-07-20 14:29:51,823 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-07-20 14:29:51,823 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:29:51,824 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-07-20 14:29:51,824 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=1386, Unknown=0, NotChecked=0, Total=1560 [2020-07-20 14:29:51,824 INFO L87 Difference]: Start difference. First operand 161 states and 176 transitions. Second operand 37 states. [2020-07-20 14:29:53,528 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:29:53,528 INFO L93 Difference]: Finished difference Result 173 states and 189 transitions. [2020-07-20 14:29:53,529 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2020-07-20 14:29:53,529 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 218 [2020-07-20 14:29:53,530 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:29:53,531 INFO L225 Difference]: With dead ends: 173 [2020-07-20 14:29:53,531 INFO L226 Difference]: Without dead ends: 171 [2020-07-20 14:29:53,533 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 248 GetRequests, 189 SyntacticMatches, 3 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1069 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=330, Invalid=2976, Unknown=0, NotChecked=0, Total=3306 [2020-07-20 14:29:53,534 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 171 states. [2020-07-20 14:29:53,548 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 171 to 170. [2020-07-20 14:29:53,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 170 states. [2020-07-20 14:29:53,549 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 170 states to 170 states and 186 transitions. [2020-07-20 14:29:53,550 INFO L78 Accepts]: Start accepts. Automaton has 170 states and 186 transitions. Word has length 218 [2020-07-20 14:29:53,550 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:29:53,551 INFO L479 AbstractCegarLoop]: Abstraction has 170 states and 186 transitions. [2020-07-20 14:29:53,551 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-07-20 14:29:53,551 INFO L276 IsEmpty]: Start isEmpty. Operand 170 states and 186 transitions. [2020-07-20 14:29:53,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 232 [2020-07-20 14:29:53,554 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:29:53,554 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] [2020-07-20 14:29:53,768 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:29:53,768 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:29:53,769 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:29:53,769 INFO L82 PathProgramCache]: Analyzing trace with hash -724536123, now seen corresponding path program 16 times [2020-07-20 14:29:53,769 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:29:53,770 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [391076250] [2020-07-20 14:29:53,770 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 14:29:53,840 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:29:53,840 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:29:53,842 INFO L263 TraceCheckSpWp]: Trace formula consists of 442 conjuncts, 41 conjunts are in the unsatisfiable core [2020-07-20 14:29:53,845 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:29:54,558 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:29:54,714 INFO L134 CoverageAnalysis]: Checked inductivity of 2826 backedges. 66 proven. 648 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2020-07-20 14:29:54,715 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:29:54,772 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:29:54,972 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [391076250] [2020-07-20 14:29:54,973 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 14:29:54,973 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-07-20 14:29:54,973 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1020051753] [2020-07-20 14:29:54,974 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-07-20 14:29:54,974 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:29:54,974 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-07-20 14:29:54,975 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=1538, Unknown=0, NotChecked=0, Total=1722 [2020-07-20 14:29:54,975 INFO L87 Difference]: Start difference. First operand 170 states and 186 transitions. Second operand 39 states. [2020-07-20 14:29:56,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:29:56,968 INFO L93 Difference]: Finished difference Result 182 states and 199 transitions. [2020-07-20 14:29:56,968 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2020-07-20 14:29:56,969 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 231 [2020-07-20 14:29:56,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:29:56,970 INFO L225 Difference]: With dead ends: 182 [2020-07-20 14:29:56,970 INFO L226 Difference]: Without dead ends: 180 [2020-07-20 14:29:56,972 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 262 GetRequests, 200 SyntacticMatches, 3 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1196 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=349, Invalid=3311, Unknown=0, NotChecked=0, Total=3660 [2020-07-20 14:29:56,972 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2020-07-20 14:29:56,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 179. [2020-07-20 14:29:56,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 179 states. [2020-07-20 14:29:56,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 196 transitions. [2020-07-20 14:29:56,986 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 196 transitions. Word has length 231 [2020-07-20 14:29:56,986 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:29:56,986 INFO L479 AbstractCegarLoop]: Abstraction has 179 states and 196 transitions. [2020-07-20 14:29:56,986 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-07-20 14:29:56,986 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 196 transitions. [2020-07-20 14:29:56,988 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 245 [2020-07-20 14:29:56,988 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:29:56,988 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] [2020-07-20 14:29:57,197 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:29:57,198 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:29:57,198 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:29:57,199 INFO L82 PathProgramCache]: Analyzing trace with hash 901344525, now seen corresponding path program 17 times [2020-07-20 14:29:57,199 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:29:57,199 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1370881319] [2020-07-20 14:29:57,200 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 14:29:57,272 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:29:57,273 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:29:57,275 INFO L263 TraceCheckSpWp]: Trace formula consists of 466 conjuncts, 43 conjunts are in the unsatisfiable core [2020-07-20 14:29:57,279 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:29:58,036 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:29:58,185 INFO L134 CoverageAnalysis]: Checked inductivity of 3181 backedges. 70 proven. 731 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2020-07-20 14:29:58,185 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:29:58,244 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:29:58,457 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1370881319] [2020-07-20 14:29:58,458 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 14:29:58,458 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-07-20 14:29:58,458 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [773377800] [2020-07-20 14:29:58,459 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-07-20 14:29:58,459 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:29:58,459 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-07-20 14:29:58,460 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=194, Invalid=1698, Unknown=0, NotChecked=0, Total=1892 [2020-07-20 14:29:58,460 INFO L87 Difference]: Start difference. First operand 179 states and 196 transitions. Second operand 41 states. [2020-07-20 14:30:00,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:30:00,617 INFO L93 Difference]: Finished difference Result 191 states and 209 transitions. [2020-07-20 14:30:00,618 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2020-07-20 14:30:00,618 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 244 [2020-07-20 14:30:00,618 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:30:00,620 INFO L225 Difference]: With dead ends: 191 [2020-07-20 14:30:00,620 INFO L226 Difference]: Without dead ends: 189 [2020-07-20 14:30:00,622 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 276 GetRequests, 211 SyntacticMatches, 3 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1330 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=368, Invalid=3664, Unknown=0, NotChecked=0, Total=4032 [2020-07-20 14:30:00,622 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 189 states. [2020-07-20 14:30:00,634 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 189 to 188. [2020-07-20 14:30:00,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 188 states. [2020-07-20 14:30:00,635 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 188 states to 188 states and 206 transitions. [2020-07-20 14:30:00,635 INFO L78 Accepts]: Start accepts. Automaton has 188 states and 206 transitions. Word has length 244 [2020-07-20 14:30:00,636 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:30:00,636 INFO L479 AbstractCegarLoop]: Abstraction has 188 states and 206 transitions. [2020-07-20 14:30:00,636 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-07-20 14:30:00,636 INFO L276 IsEmpty]: Start isEmpty. Operand 188 states and 206 transitions. [2020-07-20 14:30:00,638 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 258 [2020-07-20 14:30:00,638 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:30:00,638 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] [2020-07-20 14:30:00,839 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:00,839 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:30:00,840 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:30:00,840 INFO L82 PathProgramCache]: Analyzing trace with hash -276551227, now seen corresponding path program 18 times [2020-07-20 14:30:00,840 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:30:00,841 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [701569314] [2020-07-20 14:30:00,841 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 14:30:00,919 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:30:00,920 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:30:00,921 INFO L263 TraceCheckSpWp]: Trace formula consists of 490 conjuncts, 45 conjunts are in the unsatisfiable core [2020-07-20 14:30:00,926 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:30:01,763 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:30:01,937 INFO L134 CoverageAnalysis]: Checked inductivity of 3557 backedges. 74 proven. 819 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2020-07-20 14:30:01,937 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:30:02,001 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:30:02,229 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [701569314] [2020-07-20 14:30:02,229 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 14:30:02,229 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-07-20 14:30:02,230 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1169265499] [2020-07-20 14:30:02,230 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-07-20 14:30:02,230 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:30:02,231 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-07-20 14:30:02,231 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=204, Invalid=1866, Unknown=0, NotChecked=0, Total=2070 [2020-07-20 14:30:02,231 INFO L87 Difference]: Start difference. First operand 188 states and 206 transitions. Second operand 43 states. [2020-07-20 14:30:04,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:30:04,463 INFO L93 Difference]: Finished difference Result 200 states and 219 transitions. [2020-07-20 14:30:04,464 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2020-07-20 14:30:04,464 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 257 [2020-07-20 14:30:04,465 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:30:04,466 INFO L225 Difference]: With dead ends: 200 [2020-07-20 14:30:04,466 INFO L226 Difference]: Without dead ends: 198 [2020-07-20 14:30:04,469 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 290 GetRequests, 222 SyntacticMatches, 3 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1471 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=387, Invalid=4035, Unknown=0, NotChecked=0, Total=4422 [2020-07-20 14:30:04,469 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 198 states. [2020-07-20 14:30:04,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 198 to 197. [2020-07-20 14:30:04,482 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 197 states. [2020-07-20 14:30:04,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 197 states to 197 states and 216 transitions. [2020-07-20 14:30:04,484 INFO L78 Accepts]: Start accepts. Automaton has 197 states and 216 transitions. Word has length 257 [2020-07-20 14:30:04,484 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:30:04,484 INFO L479 AbstractCegarLoop]: Abstraction has 197 states and 216 transitions. [2020-07-20 14:30:04,484 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-07-20 14:30:04,484 INFO L276 IsEmpty]: Start isEmpty. Operand 197 states and 216 transitions. [2020-07-20 14:30:04,486 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 271 [2020-07-20 14:30:04,486 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:30:04,486 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] [2020-07-20 14:30:04,699 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:04,700 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:30:04,700 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:30:04,701 INFO L82 PathProgramCache]: Analyzing trace with hash 628348941, now seen corresponding path program 19 times [2020-07-20 14:30:04,701 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:30:04,701 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [800886671] [2020-07-20 14:30:04,702 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 14:30:04,789 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:30:04,789 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:30:04,791 INFO L263 TraceCheckSpWp]: Trace formula consists of 514 conjuncts, 47 conjunts are in the unsatisfiable core [2020-07-20 14:30:04,796 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:30:05,733 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:30:05,903 INFO L134 CoverageAnalysis]: Checked inductivity of 3954 backedges. 78 proven. 912 refuted. 0 times theorem prover too weak. 2964 trivial. 0 not checked. [2020-07-20 14:30:05,903 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:30:05,969 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:30:06,207 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [800886671] [2020-07-20 14:30:06,207 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 14:30:06,207 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-07-20 14:30:06,207 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1922482105] [2020-07-20 14:30:06,208 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-07-20 14:30:06,208 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:30:06,208 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-07-20 14:30:06,209 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=214, Invalid=2042, Unknown=0, NotChecked=0, Total=2256 [2020-07-20 14:30:06,209 INFO L87 Difference]: Start difference. First operand 197 states and 216 transitions. Second operand 45 states. [2020-07-20 14:30:08,717 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:30:08,717 INFO L93 Difference]: Finished difference Result 209 states and 229 transitions. [2020-07-20 14:30:08,718 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2020-07-20 14:30:08,718 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 270 [2020-07-20 14:30:08,719 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:30:08,720 INFO L225 Difference]: With dead ends: 209 [2020-07-20 14:30:08,720 INFO L226 Difference]: Without dead ends: 207 [2020-07-20 14:30:08,722 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 304 GetRequests, 233 SyntacticMatches, 3 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1619 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=406, Invalid=4424, Unknown=0, NotChecked=0, Total=4830 [2020-07-20 14:30:08,723 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 207 states. [2020-07-20 14:30:08,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 207 to 206. [2020-07-20 14:30:08,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 206 states. [2020-07-20 14:30:08,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 206 states to 206 states and 226 transitions. [2020-07-20 14:30:08,739 INFO L78 Accepts]: Start accepts. Automaton has 206 states and 226 transitions. Word has length 270 [2020-07-20 14:30:08,739 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:30:08,739 INFO L479 AbstractCegarLoop]: Abstraction has 206 states and 226 transitions. [2020-07-20 14:30:08,739 INFO L480 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-07-20 14:30:08,740 INFO L276 IsEmpty]: Start isEmpty. Operand 206 states and 226 transitions. [2020-07-20 14:30:08,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 284 [2020-07-20 14:30:08,741 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:30:08,742 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] [2020-07-20 14:30:08,956 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:08,957 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:30:08,957 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:30:08,958 INFO L82 PathProgramCache]: Analyzing trace with hash -1857052987, now seen corresponding path program 20 times [2020-07-20 14:30:08,958 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:30:08,958 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [889253327] [2020-07-20 14:30:08,959 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 14:30:09,061 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:30:09,061 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:30:09,064 INFO L263 TraceCheckSpWp]: Trace formula consists of 538 conjuncts, 49 conjunts are in the unsatisfiable core [2020-07-20 14:30:09,069 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:30:10,228 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:30:10,417 INFO L134 CoverageAnalysis]: Checked inductivity of 4372 backedges. 82 proven. 1010 refuted. 0 times theorem prover too weak. 3280 trivial. 0 not checked. [2020-07-20 14:30:10,417 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:30:10,493 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:30:10,757 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [889253327] [2020-07-20 14:30:10,758 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 14:30:10,758 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47] total 47 [2020-07-20 14:30:10,758 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1602977068] [2020-07-20 14:30:10,759 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-07-20 14:30:10,759 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:30:10,759 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-07-20 14:30:10,760 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=224, Invalid=2226, Unknown=0, NotChecked=0, Total=2450 [2020-07-20 14:30:10,760 INFO L87 Difference]: Start difference. First operand 206 states and 226 transitions. Second operand 47 states. [2020-07-20 14:30:13,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:30:13,419 INFO L93 Difference]: Finished difference Result 218 states and 239 transitions. [2020-07-20 14:30:13,423 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2020-07-20 14:30:13,423 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 283 [2020-07-20 14:30:13,424 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:30:13,425 INFO L225 Difference]: With dead ends: 218 [2020-07-20 14:30:13,425 INFO L226 Difference]: Without dead ends: 216 [2020-07-20 14:30:13,426 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 318 GetRequests, 244 SyntacticMatches, 3 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1774 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=425, Invalid=4831, Unknown=0, NotChecked=0, Total=5256 [2020-07-20 14:30:13,427 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 216 states. [2020-07-20 14:30:13,444 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 216 to 215. [2020-07-20 14:30:13,445 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 215 states. [2020-07-20 14:30:13,446 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 215 states to 215 states and 236 transitions. [2020-07-20 14:30:13,446 INFO L78 Accepts]: Start accepts. Automaton has 215 states and 236 transitions. Word has length 283 [2020-07-20 14:30:13,447 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:30:13,447 INFO L479 AbstractCegarLoop]: Abstraction has 215 states and 236 transitions. [2020-07-20 14:30:13,447 INFO L480 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-07-20 14:30:13,447 INFO L276 IsEmpty]: Start isEmpty. Operand 215 states and 236 transitions. [2020-07-20 14:30:13,449 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 297 [2020-07-20 14:30:13,449 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:30:13,449 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] [2020-07-20 14:30:13,662 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:13,663 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:30:13,663 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:30:13,664 INFO L82 PathProgramCache]: Analyzing trace with hash 1655603981, now seen corresponding path program 21 times [2020-07-20 14:30:13,664 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:30:13,664 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1938122363] [2020-07-20 14:30:13,665 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 14:30:13,755 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:30:13,755 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:30:13,757 INFO L263 TraceCheckSpWp]: Trace formula consists of 562 conjuncts, 51 conjunts are in the unsatisfiable core [2020-07-20 14:30:13,761 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:30:14,879 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:30:15,065 INFO L134 CoverageAnalysis]: Checked inductivity of 4811 backedges. 86 proven. 1113 refuted. 0 times theorem prover too weak. 3612 trivial. 0 not checked. [2020-07-20 14:30:15,065 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:30:15,139 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:30:15,400 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1938122363] [2020-07-20 14:30:15,401 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 14:30:15,401 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49] total 49 [2020-07-20 14:30:15,401 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1327453411] [2020-07-20 14:30:15,402 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2020-07-20 14:30:15,402 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:30:15,402 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2020-07-20 14:30:15,403 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=234, Invalid=2418, Unknown=0, NotChecked=0, Total=2652 [2020-07-20 14:30:15,403 INFO L87 Difference]: Start difference. First operand 215 states and 236 transitions. Second operand 49 states. [2020-07-20 14:30:18,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:30:18,396 INFO L93 Difference]: Finished difference Result 227 states and 249 transitions. [2020-07-20 14:30:18,396 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2020-07-20 14:30:18,397 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 296 [2020-07-20 14:30:18,397 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:30:18,399 INFO L225 Difference]: With dead ends: 227 [2020-07-20 14:30:18,399 INFO L226 Difference]: Without dead ends: 225 [2020-07-20 14:30:18,400 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 332 GetRequests, 255 SyntacticMatches, 3 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1936 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=444, Invalid=5256, Unknown=0, NotChecked=0, Total=5700 [2020-07-20 14:30:18,400 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 225 states. [2020-07-20 14:30:18,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 225 to 224. [2020-07-20 14:30:18,415 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 224 states. [2020-07-20 14:30:18,416 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 224 states to 224 states and 246 transitions. [2020-07-20 14:30:18,417 INFO L78 Accepts]: Start accepts. Automaton has 224 states and 246 transitions. Word has length 296 [2020-07-20 14:30:18,419 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:30:18,419 INFO L479 AbstractCegarLoop]: Abstraction has 224 states and 246 transitions. [2020-07-20 14:30:18,419 INFO L480 AbstractCegarLoop]: Interpolant automaton has 49 states. [2020-07-20 14:30:18,419 INFO L276 IsEmpty]: Start isEmpty. Operand 224 states and 246 transitions. [2020-07-20 14:30:18,421 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 310 [2020-07-20 14:30:18,421 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:30:18,422 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] [2020-07-20 14:30:18,635 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:18,636 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:30:18,636 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:30:18,637 INFO L82 PathProgramCache]: Analyzing trace with hash 1208144837, now seen corresponding path program 22 times [2020-07-20 14:30:18,637 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:30:18,638 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [295944169] [2020-07-20 14:30:18,638 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 14:30:18,740 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:30:18,741 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:30:18,743 INFO L263 TraceCheckSpWp]: Trace formula consists of 586 conjuncts, 53 conjunts are in the unsatisfiable core [2020-07-20 14:30:18,746 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:30:19,965 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:30:20,174 INFO L134 CoverageAnalysis]: Checked inductivity of 5271 backedges. 90 proven. 1221 refuted. 0 times theorem prover too weak. 3960 trivial. 0 not checked. [2020-07-20 14:30:20,174 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:30:20,251 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:30:20,525 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [295944169] [2020-07-20 14:30:20,526 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 14:30:20,526 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51] total 51 [2020-07-20 14:30:20,526 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1187645513] [2020-07-20 14:30:20,526 INFO L459 AbstractCegarLoop]: Interpolant automaton has 51 states [2020-07-20 14:30:20,526 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:30:20,527 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2020-07-20 14:30:20,527 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=244, Invalid=2618, Unknown=0, NotChecked=0, Total=2862 [2020-07-20 14:30:20,527 INFO L87 Difference]: Start difference. First operand 224 states and 246 transitions. Second operand 51 states. [2020-07-20 14:30:23,708 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:30:23,709 INFO L93 Difference]: Finished difference Result 236 states and 259 transitions. [2020-07-20 14:30:23,709 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2020-07-20 14:30:23,710 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 309 [2020-07-20 14:30:23,710 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:30:23,712 INFO L225 Difference]: With dead ends: 236 [2020-07-20 14:30:23,712 INFO L226 Difference]: Without dead ends: 234 [2020-07-20 14:30:23,713 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 346 GetRequests, 266 SyntacticMatches, 3 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2105 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=463, Invalid=5699, Unknown=0, NotChecked=0, Total=6162 [2020-07-20 14:30:23,714 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 234 states. [2020-07-20 14:30:23,729 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 234 to 233. [2020-07-20 14:30:23,729 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 233 states. [2020-07-20 14:30:23,731 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 233 states to 233 states and 256 transitions. [2020-07-20 14:30:23,731 INFO L78 Accepts]: Start accepts. Automaton has 233 states and 256 transitions. Word has length 309 [2020-07-20 14:30:23,731 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:30:23,731 INFO L479 AbstractCegarLoop]: Abstraction has 233 states and 256 transitions. [2020-07-20 14:30:23,731 INFO L480 AbstractCegarLoop]: Interpolant automaton has 51 states. [2020-07-20 14:30:23,732 INFO L276 IsEmpty]: Start isEmpty. Operand 233 states and 256 transitions. [2020-07-20 14:30:23,733 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 323 [2020-07-20 14:30:23,733 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:30:23,734 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] [2020-07-20 14:30:23,948 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:23,949 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:30:23,949 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:30:23,949 INFO L82 PathProgramCache]: Analyzing trace with hash 1369009677, now seen corresponding path program 23 times [2020-07-20 14:30:23,950 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:30:23,950 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [602703091] [2020-07-20 14:30:23,950 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 14:30:24,045 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:30:24,046 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:30:24,048 INFO L263 TraceCheckSpWp]: Trace formula consists of 610 conjuncts, 55 conjunts are in the unsatisfiable core [2020-07-20 14:30:24,052 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:30:25,411 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:30:25,630 INFO L134 CoverageAnalysis]: Checked inductivity of 5752 backedges. 94 proven. 1334 refuted. 0 times theorem prover too weak. 4324 trivial. 0 not checked. [2020-07-20 14:30:25,631 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:30:25,713 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:30:26,006 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [602703091] [2020-07-20 14:30:26,006 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 14:30:26,006 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53] total 53 [2020-07-20 14:30:26,006 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1989557714] [2020-07-20 14:30:26,007 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2020-07-20 14:30:26,007 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:30:26,007 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2020-07-20 14:30:26,008 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=254, Invalid=2826, Unknown=0, NotChecked=0, Total=3080 [2020-07-20 14:30:26,008 INFO L87 Difference]: Start difference. First operand 233 states and 256 transitions. Second operand 53 states. [2020-07-20 14:30:29,453 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:30:29,453 INFO L93 Difference]: Finished difference Result 245 states and 269 transitions. [2020-07-20 14:30:29,454 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2020-07-20 14:30:29,454 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 322 [2020-07-20 14:30:29,455 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:30:29,456 INFO L225 Difference]: With dead ends: 245 [2020-07-20 14:30:29,456 INFO L226 Difference]: Without dead ends: 243 [2020-07-20 14:30:29,457 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 360 GetRequests, 277 SyntacticMatches, 3 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2281 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=482, Invalid=6160, Unknown=0, NotChecked=0, Total=6642 [2020-07-20 14:30:29,457 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 243 states. [2020-07-20 14:30:29,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 243 to 242. [2020-07-20 14:30:29,476 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 242 states. [2020-07-20 14:30:29,477 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 242 states to 242 states and 266 transitions. [2020-07-20 14:30:29,477 INFO L78 Accepts]: Start accepts. Automaton has 242 states and 266 transitions. Word has length 322 [2020-07-20 14:30:29,477 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:30:29,478 INFO L479 AbstractCegarLoop]: Abstraction has 242 states and 266 transitions. [2020-07-20 14:30:29,478 INFO L480 AbstractCegarLoop]: Interpolant automaton has 53 states. [2020-07-20 14:30:29,478 INFO L276 IsEmpty]: Start isEmpty. Operand 242 states and 266 transitions. [2020-07-20 14:30:29,480 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 336 [2020-07-20 14:30:29,480 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:30:29,480 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] [2020-07-20 14:30:29,695 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:29,696 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:30:29,696 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:30:29,696 INFO L82 PathProgramCache]: Analyzing trace with hash -43136827, now seen corresponding path program 24 times [2020-07-20 14:30:29,697 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:30:29,697 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [741107239] [2020-07-20 14:30:29,697 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 14:30:29,808 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:30:29,808 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:30:29,811 INFO L263 TraceCheckSpWp]: Trace formula consists of 634 conjuncts, 57 conjunts are in the unsatisfiable core [2020-07-20 14:30:29,815 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:30:31,243 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:30:31,491 INFO L134 CoverageAnalysis]: Checked inductivity of 6254 backedges. 98 proven. 1452 refuted. 0 times theorem prover too weak. 4704 trivial. 0 not checked. [2020-07-20 14:30:31,492 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:30:31,580 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:30:31,884 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [741107239] [2020-07-20 14:30:31,884 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 14:30:31,885 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55] total 55 [2020-07-20 14:30:31,885 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [213743039] [2020-07-20 14:30:31,886 INFO L459 AbstractCegarLoop]: Interpolant automaton has 55 states [2020-07-20 14:30:31,886 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:30:31,886 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2020-07-20 14:30:31,886 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=264, Invalid=3042, Unknown=0, NotChecked=0, Total=3306 [2020-07-20 14:30:31,886 INFO L87 Difference]: Start difference. First operand 242 states and 266 transitions. Second operand 55 states. [2020-07-20 14:30:35,552 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:30:35,552 INFO L93 Difference]: Finished difference Result 254 states and 279 transitions. [2020-07-20 14:30:35,553 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2020-07-20 14:30:35,553 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 335 [2020-07-20 14:30:35,554 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:30:35,556 INFO L225 Difference]: With dead ends: 254 [2020-07-20 14:30:35,556 INFO L226 Difference]: Without dead ends: 252 [2020-07-20 14:30:35,557 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 374 GetRequests, 288 SyntacticMatches, 3 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2464 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=501, Invalid=6639, Unknown=0, NotChecked=0, Total=7140 [2020-07-20 14:30:35,558 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 252 states. [2020-07-20 14:30:35,573 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 252 to 251. [2020-07-20 14:30:35,573 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 251 states. [2020-07-20 14:30:35,575 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 251 states to 251 states and 276 transitions. [2020-07-20 14:30:35,575 INFO L78 Accepts]: Start accepts. Automaton has 251 states and 276 transitions. Word has length 335 [2020-07-20 14:30:35,575 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:30:35,575 INFO L479 AbstractCegarLoop]: Abstraction has 251 states and 276 transitions. [2020-07-20 14:30:35,575 INFO L480 AbstractCegarLoop]: Interpolant automaton has 55 states. [2020-07-20 14:30:35,576 INFO L276 IsEmpty]: Start isEmpty. Operand 251 states and 276 transitions. [2020-07-20 14:30:35,578 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 349 [2020-07-20 14:30:35,578 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:30:35,578 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] [2020-07-20 14:30:35,786 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:35,787 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:30:35,787 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:30:35,788 INFO L82 PathProgramCache]: Analyzing trace with hash 2053413133, now seen corresponding path program 25 times [2020-07-20 14:30:35,788 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:30:35,789 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [510236429] [2020-07-20 14:30:35,789 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 14:30:35,907 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:30:35,907 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:30:35,910 INFO L263 TraceCheckSpWp]: Trace formula consists of 658 conjuncts, 59 conjunts are in the unsatisfiable core [2020-07-20 14:30:35,915 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:30:37,470 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:30:37,723 INFO L134 CoverageAnalysis]: Checked inductivity of 6777 backedges. 102 proven. 1575 refuted. 0 times theorem prover too weak. 5100 trivial. 0 not checked. [2020-07-20 14:30:37,723 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:30:37,816 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:30:38,129 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [510236429] [2020-07-20 14:30:38,129 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 14:30:38,129 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57] total 57 [2020-07-20 14:30:38,130 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1993158635] [2020-07-20 14:30:38,130 INFO L459 AbstractCegarLoop]: Interpolant automaton has 57 states [2020-07-20 14:30:38,130 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:30:38,131 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2020-07-20 14:30:38,131 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=274, Invalid=3266, Unknown=0, NotChecked=0, Total=3540 [2020-07-20 14:30:38,131 INFO L87 Difference]: Start difference. First operand 251 states and 276 transitions. Second operand 57 states. [2020-07-20 14:30:42,191 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:30:42,192 INFO L93 Difference]: Finished difference Result 263 states and 289 transitions. [2020-07-20 14:30:42,192 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2020-07-20 14:30:42,192 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 348 [2020-07-20 14:30:42,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:30:42,195 INFO L225 Difference]: With dead ends: 263 [2020-07-20 14:30:42,195 INFO L226 Difference]: Without dead ends: 261 [2020-07-20 14:30:42,196 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 388 GetRequests, 299 SyntacticMatches, 3 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2654 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=520, Invalid=7136, Unknown=0, NotChecked=0, Total=7656 [2020-07-20 14:30:42,197 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 261 states. [2020-07-20 14:30:42,215 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 261 to 260. [2020-07-20 14:30:42,215 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 260 states. [2020-07-20 14:30:42,216 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 260 states to 260 states and 286 transitions. [2020-07-20 14:30:42,216 INFO L78 Accepts]: Start accepts. Automaton has 260 states and 286 transitions. Word has length 348 [2020-07-20 14:30:42,217 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:30:42,217 INFO L479 AbstractCegarLoop]: Abstraction has 260 states and 286 transitions. [2020-07-20 14:30:42,217 INFO L480 AbstractCegarLoop]: Interpolant automaton has 57 states. [2020-07-20 14:30:42,217 INFO L276 IsEmpty]: Start isEmpty. Operand 260 states and 286 transitions. [2020-07-20 14:30:42,219 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 362 [2020-07-20 14:30:42,220 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:30:42,220 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] [2020-07-20 14:30:42,433 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:42,434 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:30:42,434 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:30:42,435 INFO L82 PathProgramCache]: Analyzing trace with hash -144671291, now seen corresponding path program 26 times [2020-07-20 14:30:42,435 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:30:42,435 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [994383117] [2020-07-20 14:30:42,436 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 14:30:42,548 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:30:42,548 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:30:42,553 INFO L263 TraceCheckSpWp]: Trace formula consists of 682 conjuncts, 61 conjunts are in the unsatisfiable core [2020-07-20 14:30:42,559 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:30:44,251 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:30:44,516 INFO L134 CoverageAnalysis]: Checked inductivity of 7321 backedges. 106 proven. 1703 refuted. 0 times theorem prover too weak. 5512 trivial. 0 not checked. [2020-07-20 14:30:44,517 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:30:44,625 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:30:44,967 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [994383117] [2020-07-20 14:30:44,967 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 14:30:44,968 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59] total 59 [2020-07-20 14:30:44,968 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [275474543] [2020-07-20 14:30:44,968 INFO L459 AbstractCegarLoop]: Interpolant automaton has 59 states [2020-07-20 14:30:44,968 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:30:44,969 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2020-07-20 14:30:44,969 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=284, Invalid=3498, Unknown=0, NotChecked=0, Total=3782 [2020-07-20 14:30:44,969 INFO L87 Difference]: Start difference. First operand 260 states and 286 transitions. Second operand 59 states. [2020-07-20 14:30:49,355 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:30:49,356 INFO L93 Difference]: Finished difference Result 272 states and 299 transitions. [2020-07-20 14:30:49,357 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2020-07-20 14:30:49,357 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 361 [2020-07-20 14:30:49,358 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:30:49,360 INFO L225 Difference]: With dead ends: 272 [2020-07-20 14:30:49,360 INFO L226 Difference]: Without dead ends: 270 [2020-07-20 14:30:49,361 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 402 GetRequests, 310 SyntacticMatches, 3 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2851 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=539, Invalid=7651, Unknown=0, NotChecked=0, Total=8190 [2020-07-20 14:30:49,361 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 270 states. [2020-07-20 14:30:49,380 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 270 to 269. [2020-07-20 14:30:49,381 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 269 states. [2020-07-20 14:30:49,382 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 269 states to 269 states and 296 transitions. [2020-07-20 14:30:49,382 INFO L78 Accepts]: Start accepts. Automaton has 269 states and 296 transitions. Word has length 361 [2020-07-20 14:30:49,382 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:30:49,383 INFO L479 AbstractCegarLoop]: Abstraction has 269 states and 296 transitions. [2020-07-20 14:30:49,383 INFO L480 AbstractCegarLoop]: Interpolant automaton has 59 states. [2020-07-20 14:30:49,383 INFO L276 IsEmpty]: Start isEmpty. Operand 269 states and 296 transitions. [2020-07-20 14:30:49,385 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 375 [2020-07-20 14:30:49,385 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:30:49,385 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] [2020-07-20 14:30:49,598 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:49,599 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:30:49,599 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:30:49,599 INFO L82 PathProgramCache]: Analyzing trace with hash -1992293363, now seen corresponding path program 27 times [2020-07-20 14:30:49,599 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:30:49,599 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [31634651] [2020-07-20 14:30:49,599 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 14:30:49,703 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:30:49,704 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:30:49,706 INFO L263 TraceCheckSpWp]: Trace formula consists of 706 conjuncts, 63 conjunts are in the unsatisfiable core [2020-07-20 14:30:49,712 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:30:51,560 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:30:51,848 INFO L134 CoverageAnalysis]: Checked inductivity of 7886 backedges. 110 proven. 1836 refuted. 0 times theorem prover too weak. 5940 trivial. 0 not checked. [2020-07-20 14:30:51,848 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:30:51,962 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:30:52,327 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [31634651] [2020-07-20 14:30:52,327 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 14:30:52,328 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [61] total 61 [2020-07-20 14:30:52,328 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1886336769] [2020-07-20 14:30:52,328 INFO L459 AbstractCegarLoop]: Interpolant automaton has 61 states [2020-07-20 14:30:52,329 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:30:52,329 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2020-07-20 14:30:52,329 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=294, Invalid=3738, Unknown=0, NotChecked=0, Total=4032 [2020-07-20 14:30:52,329 INFO L87 Difference]: Start difference. First operand 269 states and 296 transitions. Second operand 61 states. [2020-07-20 14:30:57,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:30:57,245 INFO L93 Difference]: Finished difference Result 281 states and 309 transitions. [2020-07-20 14:30:57,246 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 88 states. [2020-07-20 14:30:57,246 INFO L78 Accepts]: Start accepts. Automaton has 61 states. Word has length 374 [2020-07-20 14:30:57,247 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:30:57,249 INFO L225 Difference]: With dead ends: 281 [2020-07-20 14:30:57,249 INFO L226 Difference]: Without dead ends: 279 [2020-07-20 14:30:57,250 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 416 GetRequests, 321 SyntacticMatches, 3 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3055 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=558, Invalid=8184, Unknown=0, NotChecked=0, Total=8742 [2020-07-20 14:30:57,251 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 279 states. [2020-07-20 14:30:57,274 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 279 to 278. [2020-07-20 14:30:57,274 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 278 states. [2020-07-20 14:30:57,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 278 states to 278 states and 306 transitions. [2020-07-20 14:30:57,276 INFO L78 Accepts]: Start accepts. Automaton has 278 states and 306 transitions. Word has length 374 [2020-07-20 14:30:57,276 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:30:57,276 INFO L479 AbstractCegarLoop]: Abstraction has 278 states and 306 transitions. [2020-07-20 14:30:57,276 INFO L480 AbstractCegarLoop]: Interpolant automaton has 61 states. [2020-07-20 14:30:57,277 INFO L276 IsEmpty]: Start isEmpty. Operand 278 states and 306 transitions. [2020-07-20 14:30:57,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 388 [2020-07-20 14:30:57,279 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:30:57,280 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] [2020-07-20 14:30:57,492 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:57,493 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:30:57,493 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:30:57,493 INFO L82 PathProgramCache]: Analyzing trace with hash -676662587, now seen corresponding path program 28 times [2020-07-20 14:30:57,494 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:30:57,494 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1343201319] [2020-07-20 14:30:57,494 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 14:30:57,654 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:30:57,654 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:30:57,658 INFO L263 TraceCheckSpWp]: Trace formula consists of 730 conjuncts, 65 conjunts are in the unsatisfiable core [2020-07-20 14:30:57,663 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:30:59,669 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:30:59,980 INFO L134 CoverageAnalysis]: Checked inductivity of 8472 backedges. 114 proven. 1974 refuted. 0 times theorem prover too weak. 6384 trivial. 0 not checked. [2020-07-20 14:30:59,980 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:31:00,092 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:31:00,471 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1343201319] [2020-07-20 14:31:00,471 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 14:31:00,471 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [63] total 63 [2020-07-20 14:31:00,471 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1489851550] [2020-07-20 14:31:00,472 INFO L459 AbstractCegarLoop]: Interpolant automaton has 63 states [2020-07-20 14:31:00,473 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:31:00,473 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2020-07-20 14:31:00,473 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=304, Invalid=3986, Unknown=0, NotChecked=0, Total=4290 [2020-07-20 14:31:00,473 INFO L87 Difference]: Start difference. First operand 278 states and 306 transitions. Second operand 63 states. [2020-07-20 14:31:05,653 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:31:05,653 INFO L93 Difference]: Finished difference Result 290 states and 319 transitions. [2020-07-20 14:31:05,654 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2020-07-20 14:31:05,654 INFO L78 Accepts]: Start accepts. Automaton has 63 states. Word has length 387 [2020-07-20 14:31:05,655 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:31:05,656 INFO L225 Difference]: With dead ends: 290 [2020-07-20 14:31:05,656 INFO L226 Difference]: Without dead ends: 288 [2020-07-20 14:31:05,657 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 430 GetRequests, 332 SyntacticMatches, 3 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3266 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=577, Invalid=8735, Unknown=0, NotChecked=0, Total=9312 [2020-07-20 14:31:05,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 288 states. [2020-07-20 14:31:05,677 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 288 to 287. [2020-07-20 14:31:05,677 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 287 states. [2020-07-20 14:31:05,679 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 287 states to 287 states and 316 transitions. [2020-07-20 14:31:05,679 INFO L78 Accepts]: Start accepts. Automaton has 287 states and 316 transitions. Word has length 387 [2020-07-20 14:31:05,679 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:31:05,679 INFO L479 AbstractCegarLoop]: Abstraction has 287 states and 316 transitions. [2020-07-20 14:31:05,680 INFO L480 AbstractCegarLoop]: Interpolant automaton has 63 states. [2020-07-20 14:31:05,680 INFO L276 IsEmpty]: Start isEmpty. Operand 287 states and 316 transitions. [2020-07-20 14:31:05,682 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 401 [2020-07-20 14:31:05,682 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:31:05,683 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] [2020-07-20 14:31:05,898 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:31:05,899 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:31:05,899 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:31:05,899 INFO L82 PathProgramCache]: Analyzing trace with hash 1314631437, now seen corresponding path program 29 times [2020-07-20 14:31:05,899 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:31:05,899 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [707595494] [2020-07-20 14:31:05,899 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 14:31:06,007 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:31:06,007 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:31:06,010 INFO L263 TraceCheckSpWp]: Trace formula consists of 754 conjuncts, 67 conjunts are in the unsatisfiable core [2020-07-20 14:31:06,015 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:31:08,277 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:31:08,603 INFO L134 CoverageAnalysis]: Checked inductivity of 9079 backedges. 118 proven. 2117 refuted. 0 times theorem prover too weak. 6844 trivial. 0 not checked. [2020-07-20 14:31:08,603 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:31:08,722 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:31:09,120 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [707595494] [2020-07-20 14:31:09,120 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 14:31:09,121 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [65] total 65 [2020-07-20 14:31:09,121 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1142629825] [2020-07-20 14:31:09,121 INFO L459 AbstractCegarLoop]: Interpolant automaton has 65 states [2020-07-20 14:31:09,121 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:31:09,122 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2020-07-20 14:31:09,122 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=314, Invalid=4242, Unknown=0, NotChecked=0, Total=4556 [2020-07-20 14:31:09,122 INFO L87 Difference]: Start difference. First operand 287 states and 316 transitions. Second operand 65 states. [2020-07-20 14:31:14,560 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:31:14,561 INFO L93 Difference]: Finished difference Result 299 states and 329 transitions. [2020-07-20 14:31:14,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2020-07-20 14:31:14,562 INFO L78 Accepts]: Start accepts. Automaton has 65 states. Word has length 400 [2020-07-20 14:31:14,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:31:14,564 INFO L225 Difference]: With dead ends: 299 [2020-07-20 14:31:14,565 INFO L226 Difference]: Without dead ends: 297 [2020-07-20 14:31:14,566 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 444 GetRequests, 343 SyntacticMatches, 3 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3484 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=596, Invalid=9304, Unknown=0, NotChecked=0, Total=9900 [2020-07-20 14:31:14,567 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 297 states. [2020-07-20 14:31:14,584 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 297 to 296. [2020-07-20 14:31:14,584 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 296 states. [2020-07-20 14:31:14,586 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 296 states to 296 states and 326 transitions. [2020-07-20 14:31:14,586 INFO L78 Accepts]: Start accepts. Automaton has 296 states and 326 transitions. Word has length 400 [2020-07-20 14:31:14,587 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:31:14,587 INFO L479 AbstractCegarLoop]: Abstraction has 296 states and 326 transitions. [2020-07-20 14:31:14,587 INFO L480 AbstractCegarLoop]: Interpolant automaton has 65 states. [2020-07-20 14:31:14,587 INFO L276 IsEmpty]: Start isEmpty. Operand 296 states and 326 transitions. [2020-07-20 14:31:14,591 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 414 [2020-07-20 14:31:14,591 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:31:14,591 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] [2020-07-20 14:31:14,806 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:31:14,806 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:31:14,806 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:31:14,807 INFO L82 PathProgramCache]: Analyzing trace with hash -1675810875, now seen corresponding path program 30 times [2020-07-20 14:31:14,807 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:31:14,808 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1636955391] [2020-07-20 14:31:14,808 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 14:31:14,921 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:31:14,921 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:31:14,924 INFO L263 TraceCheckSpWp]: Trace formula consists of 778 conjuncts, 69 conjunts are in the unsatisfiable core [2020-07-20 14:31:14,940 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:31:17,260 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:31:17,610 INFO L134 CoverageAnalysis]: Checked inductivity of 9707 backedges. 122 proven. 2265 refuted. 0 times theorem prover too weak. 7320 trivial. 0 not checked. [2020-07-20 14:31:17,610 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:31:17,748 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:31:18,169 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1636955391] [2020-07-20 14:31:18,169 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 14:31:18,170 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [67] total 67 [2020-07-20 14:31:18,170 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [414200026] [2020-07-20 14:31:18,170 INFO L459 AbstractCegarLoop]: Interpolant automaton has 67 states [2020-07-20 14:31:18,170 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:31:18,171 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2020-07-20 14:31:18,171 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=324, Invalid=4506, Unknown=0, NotChecked=0, Total=4830 [2020-07-20 14:31:18,171 INFO L87 Difference]: Start difference. First operand 296 states and 326 transitions. Second operand 67 states. [2020-07-20 14:31:24,179 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:31:24,180 INFO L93 Difference]: Finished difference Result 308 states and 339 transitions. [2020-07-20 14:31:24,181 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 97 states. [2020-07-20 14:31:24,181 INFO L78 Accepts]: Start accepts. Automaton has 67 states. Word has length 413 [2020-07-20 14:31:24,182 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:31:24,184 INFO L225 Difference]: With dead ends: 308 [2020-07-20 14:31:24,184 INFO L226 Difference]: Without dead ends: 306 [2020-07-20 14:31:24,185 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 458 GetRequests, 354 SyntacticMatches, 3 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3709 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=615, Invalid=9891, Unknown=0, NotChecked=0, Total=10506 [2020-07-20 14:31:24,185 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 306 states. [2020-07-20 14:31:24,207 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 306 to 305. [2020-07-20 14:31:24,207 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 305 states. [2020-07-20 14:31:24,208 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 305 states to 305 states and 336 transitions. [2020-07-20 14:31:24,208 INFO L78 Accepts]: Start accepts. Automaton has 305 states and 336 transitions. Word has length 413 [2020-07-20 14:31:24,209 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:31:24,209 INFO L479 AbstractCegarLoop]: Abstraction has 305 states and 336 transitions. [2020-07-20 14:31:24,209 INFO L480 AbstractCegarLoop]: Interpolant automaton has 67 states. [2020-07-20 14:31:24,209 INFO L276 IsEmpty]: Start isEmpty. Operand 305 states and 336 transitions. [2020-07-20 14:31:24,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 427 [2020-07-20 14:31:24,212 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:31:24,213 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] [2020-07-20 14:31:24,425 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:31:24,426 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:31:24,426 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:31:24,427 INFO L82 PathProgramCache]: Analyzing trace with hash -1108895219, now seen corresponding path program 31 times [2020-07-20 14:31:24,427 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:31:24,427 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [997212318] [2020-07-20 14:31:24,428 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 14:31:24,548 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:31:24,548 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:31:24,551 INFO L263 TraceCheckSpWp]: Trace formula consists of 802 conjuncts, 71 conjunts are in the unsatisfiable core [2020-07-20 14:31:24,556 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:31:27,094 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:31:27,457 INFO L134 CoverageAnalysis]: Checked inductivity of 10356 backedges. 126 proven. 2418 refuted. 0 times theorem prover too weak. 7812 trivial. 0 not checked. [2020-07-20 14:31:27,457 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:31:27,599 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:31:28,053 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [997212318] [2020-07-20 14:31:28,053 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 14:31:28,053 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [69] total 69 [2020-07-20 14:31:28,053 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1169776495] [2020-07-20 14:31:28,054 INFO L459 AbstractCegarLoop]: Interpolant automaton has 69 states [2020-07-20 14:31:28,054 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:31:28,054 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2020-07-20 14:31:28,055 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=334, Invalid=4778, Unknown=0, NotChecked=0, Total=5112 [2020-07-20 14:31:28,055 INFO L87 Difference]: Start difference. First operand 305 states and 336 transitions. Second operand 69 states. [2020-07-20 14:31:34,636 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:31:34,636 INFO L93 Difference]: Finished difference Result 317 states and 349 transitions. [2020-07-20 14:31:34,637 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2020-07-20 14:31:34,637 INFO L78 Accepts]: Start accepts. Automaton has 69 states. Word has length 426 [2020-07-20 14:31:34,638 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:31:34,640 INFO L225 Difference]: With dead ends: 317 [2020-07-20 14:31:34,640 INFO L226 Difference]: Without dead ends: 315 [2020-07-20 14:31:34,642 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 472 GetRequests, 365 SyntacticMatches, 3 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3941 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=634, Invalid=10496, Unknown=0, NotChecked=0, Total=11130 [2020-07-20 14:31:34,642 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 315 states. [2020-07-20 14:31:34,665 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 315 to 314. [2020-07-20 14:31:34,665 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 314 states. [2020-07-20 14:31:34,666 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 314 states to 314 states and 346 transitions. [2020-07-20 14:31:34,666 INFO L78 Accepts]: Start accepts. Automaton has 314 states and 346 transitions. Word has length 426 [2020-07-20 14:31:34,667 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:31:34,667 INFO L479 AbstractCegarLoop]: Abstraction has 314 states and 346 transitions. [2020-07-20 14:31:34,667 INFO L480 AbstractCegarLoop]: Interpolant automaton has 69 states. [2020-07-20 14:31:34,667 INFO L276 IsEmpty]: Start isEmpty. Operand 314 states and 346 transitions. [2020-07-20 14:31:34,670 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 440 [2020-07-20 14:31:34,670 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:31:34,671 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] [2020-07-20 14:31:34,883 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:31:34,884 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:31:34,884 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:31:34,885 INFO L82 PathProgramCache]: Analyzing trace with hash -1635312443, now seen corresponding path program 32 times [2020-07-20 14:31:34,885 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:31:34,885 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [923869653] [2020-07-20 14:31:34,886 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 14:31:35,003 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:31:35,003 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:31:35,007 INFO L263 TraceCheckSpWp]: Trace formula consists of 826 conjuncts, 73 conjunts are in the unsatisfiable core [2020-07-20 14:31:35,012 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:31:37,688 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:31:38,078 INFO L134 CoverageAnalysis]: Checked inductivity of 11026 backedges. 130 proven. 2576 refuted. 0 times theorem prover too weak. 8320 trivial. 0 not checked. [2020-07-20 14:31:38,078 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:31:38,222 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:31:38,685 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [923869653] [2020-07-20 14:31:38,685 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 14:31:38,685 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [71] total 71 [2020-07-20 14:31:38,685 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [610285040] [2020-07-20 14:31:38,686 INFO L459 AbstractCegarLoop]: Interpolant automaton has 71 states [2020-07-20 14:31:38,686 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:31:38,686 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2020-07-20 14:31:38,687 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=344, Invalid=5058, Unknown=0, NotChecked=0, Total=5402 [2020-07-20 14:31:38,687 INFO L87 Difference]: Start difference. First operand 314 states and 346 transitions. Second operand 71 states. [2020-07-20 14:31:45,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:31:45,874 INFO L93 Difference]: Finished difference Result 326 states and 359 transitions. [2020-07-20 14:31:45,875 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 103 states. [2020-07-20 14:31:45,875 INFO L78 Accepts]: Start accepts. Automaton has 71 states. Word has length 439 [2020-07-20 14:31:45,876 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:31:45,878 INFO L225 Difference]: With dead ends: 326 [2020-07-20 14:31:45,878 INFO L226 Difference]: Without dead ends: 324 [2020-07-20 14:31:45,879 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 486 GetRequests, 376 SyntacticMatches, 3 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4180 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=653, Invalid=11119, Unknown=0, NotChecked=0, Total=11772 [2020-07-20 14:31:45,879 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 324 states. [2020-07-20 14:31:45,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 324 to 323. [2020-07-20 14:31:45,901 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 323 states. [2020-07-20 14:31:45,902 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 323 states to 323 states and 356 transitions. [2020-07-20 14:31:45,902 INFO L78 Accepts]: Start accepts. Automaton has 323 states and 356 transitions. Word has length 439 [2020-07-20 14:31:45,902 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:31:45,903 INFO L479 AbstractCegarLoop]: Abstraction has 323 states and 356 transitions. [2020-07-20 14:31:45,903 INFO L480 AbstractCegarLoop]: Interpolant automaton has 71 states. [2020-07-20 14:31:45,903 INFO L276 IsEmpty]: Start isEmpty. Operand 323 states and 356 transitions. [2020-07-20 14:31:45,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 453 [2020-07-20 14:31:45,906 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:31:45,906 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] [2020-07-20 14:31:46,121 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:31:46,122 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:31:46,122 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:31:46,122 INFO L82 PathProgramCache]: Analyzing trace with hash -267139827, now seen corresponding path program 33 times [2020-07-20 14:31:46,122 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:31:46,122 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [320415257] [2020-07-20 14:31:46,122 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 14:31:46,244 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:31:46,244 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:31:46,247 INFO L263 TraceCheckSpWp]: Trace formula consists of 850 conjuncts, 75 conjunts are in the unsatisfiable core [2020-07-20 14:31:46,252 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:31:49,610 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:31:50,044 INFO L134 CoverageAnalysis]: Checked inductivity of 11717 backedges. 134 proven. 2739 refuted. 0 times theorem prover too weak. 8844 trivial. 0 not checked. [2020-07-20 14:31:50,044 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:31:50,199 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:31:50,718 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [320415257] [2020-07-20 14:31:50,719 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 14:31:50,719 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [73] total 73 [2020-07-20 14:31:50,719 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1346744847] [2020-07-20 14:31:50,720 INFO L459 AbstractCegarLoop]: Interpolant automaton has 73 states [2020-07-20 14:31:50,720 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:31:50,720 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2020-07-20 14:31:50,721 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=354, Invalid=5346, Unknown=0, NotChecked=0, Total=5700 [2020-07-20 14:31:50,721 INFO L87 Difference]: Start difference. First operand 323 states and 356 transitions. Second operand 73 states. [2020-07-20 14:31:58,643 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:31:58,643 INFO L93 Difference]: Finished difference Result 335 states and 369 transitions. [2020-07-20 14:31:58,644 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 106 states. [2020-07-20 14:31:58,645 INFO L78 Accepts]: Start accepts. Automaton has 73 states. Word has length 452 [2020-07-20 14:31:58,645 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:31:58,647 INFO L225 Difference]: With dead ends: 335 [2020-07-20 14:31:58,647 INFO L226 Difference]: Without dead ends: 333 [2020-07-20 14:31:58,648 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 500 GetRequests, 387 SyntacticMatches, 3 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4426 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=672, Invalid=11760, Unknown=0, NotChecked=0, Total=12432 [2020-07-20 14:31:58,649 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 333 states. [2020-07-20 14:31:58,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 333 to 332. [2020-07-20 14:31:58,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 332 states. [2020-07-20 14:31:58,675 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 332 states to 332 states and 366 transitions. [2020-07-20 14:31:58,675 INFO L78 Accepts]: Start accepts. Automaton has 332 states and 366 transitions. Word has length 452 [2020-07-20 14:31:58,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:31:58,676 INFO L479 AbstractCegarLoop]: Abstraction has 332 states and 366 transitions. [2020-07-20 14:31:58,676 INFO L480 AbstractCegarLoop]: Interpolant automaton has 73 states. [2020-07-20 14:31:58,676 INFO L276 IsEmpty]: Start isEmpty. Operand 332 states and 366 transitions. [2020-07-20 14:31:58,679 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 466 [2020-07-20 14:31:58,679 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:31:58,680 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] [2020-07-20 14:31:58,892 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:31:58,893 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:31:58,893 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:31:58,894 INFO L82 PathProgramCache]: Analyzing trace with hash -1799827003, now seen corresponding path program 34 times [2020-07-20 14:31:58,894 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:31:58,894 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [761591368] [2020-07-20 14:31:58,895 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 14:31:59,018 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:31:59,019 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:31:59,022 INFO L263 TraceCheckSpWp]: Trace formula consists of 874 conjuncts, 77 conjunts are in the unsatisfiable core [2020-07-20 14:31:59,027 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:32:02,220 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:32:02,670 INFO L134 CoverageAnalysis]: Checked inductivity of 12429 backedges. 138 proven. 2907 refuted. 0 times theorem prover too weak. 9384 trivial. 0 not checked. [2020-07-20 14:32:02,670 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:32:02,837 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:32:03,354 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [761591368] [2020-07-20 14:32:03,355 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 14:32:03,355 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [75] total 75 [2020-07-20 14:32:03,355 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [182491587] [2020-07-20 14:32:03,356 INFO L459 AbstractCegarLoop]: Interpolant automaton has 75 states [2020-07-20 14:32:03,356 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:32:03,357 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2020-07-20 14:32:03,357 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=364, Invalid=5642, Unknown=0, NotChecked=0, Total=6006 [2020-07-20 14:32:03,357 INFO L87 Difference]: Start difference. First operand 332 states and 366 transitions. Second operand 75 states. [2020-07-20 14:32:12,526 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:32:12,526 INFO L93 Difference]: Finished difference Result 344 states and 379 transitions. [2020-07-20 14:32:12,528 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 109 states. [2020-07-20 14:32:12,528 INFO L78 Accepts]: Start accepts. Automaton has 75 states. Word has length 465 [2020-07-20 14:32:12,529 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:32:12,531 INFO L225 Difference]: With dead ends: 344 [2020-07-20 14:32:12,531 INFO L226 Difference]: Without dead ends: 342 [2020-07-20 14:32:12,532 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 514 GetRequests, 398 SyntacticMatches, 3 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4679 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=691, Invalid=12419, Unknown=0, NotChecked=0, Total=13110 [2020-07-20 14:32:12,532 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 342 states. [2020-07-20 14:32:12,557 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 342 to 341. [2020-07-20 14:32:12,557 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 341 states. [2020-07-20 14:32:12,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 341 states to 341 states and 376 transitions. [2020-07-20 14:32:12,559 INFO L78 Accepts]: Start accepts. Automaton has 341 states and 376 transitions. Word has length 465 [2020-07-20 14:32:12,559 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:32:12,559 INFO L479 AbstractCegarLoop]: Abstraction has 341 states and 376 transitions. [2020-07-20 14:32:12,559 INFO L480 AbstractCegarLoop]: Interpolant automaton has 75 states. [2020-07-20 14:32:12,560 INFO L276 IsEmpty]: Start isEmpty. Operand 341 states and 376 transitions. [2020-07-20 14:32:12,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 479 [2020-07-20 14:32:12,563 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:32:12,563 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] [2020-07-20 14:32:12,777 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:32:12,778 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:32:12,778 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:32:12,779 INFO L82 PathProgramCache]: Analyzing trace with hash 554709005, now seen corresponding path program 35 times [2020-07-20 14:32:12,779 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:32:12,780 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [700919230] [2020-07-20 14:32:12,780 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 14:32:12,905 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:32:12,905 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:32:12,908 INFO L263 TraceCheckSpWp]: Trace formula consists of 898 conjuncts, 79 conjunts are in the unsatisfiable core [2020-07-20 14:32:12,913 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:32:16,489 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:32:16,968 INFO L134 CoverageAnalysis]: Checked inductivity of 13162 backedges. 142 proven. 3080 refuted. 0 times theorem prover too weak. 9940 trivial. 0 not checked. [2020-07-20 14:32:16,968 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:32:17,148 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:32:17,726 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [700919230] [2020-07-20 14:32:17,726 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 14:32:17,727 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [77] total 77 [2020-07-20 14:32:17,727 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1906192062] [2020-07-20 14:32:17,727 INFO L459 AbstractCegarLoop]: Interpolant automaton has 77 states [2020-07-20 14:32:17,727 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:32:17,728 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2020-07-20 14:32:17,728 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=374, Invalid=5946, Unknown=0, NotChecked=0, Total=6320 [2020-07-20 14:32:17,728 INFO L87 Difference]: Start difference. First operand 341 states and 376 transitions. Second operand 77 states. [2020-07-20 14:32:28,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:32:28,018 INFO L93 Difference]: Finished difference Result 353 states and 389 transitions. [2020-07-20 14:32:28,019 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 112 states. [2020-07-20 14:32:28,020 INFO L78 Accepts]: Start accepts. Automaton has 77 states. Word has length 478 [2020-07-20 14:32:28,021 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:32:28,023 INFO L225 Difference]: With dead ends: 353 [2020-07-20 14:32:28,023 INFO L226 Difference]: Without dead ends: 351 [2020-07-20 14:32:28,024 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 528 GetRequests, 409 SyntacticMatches, 3 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4939 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=710, Invalid=13096, Unknown=0, NotChecked=0, Total=13806 [2020-07-20 14:32:28,024 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 351 states. [2020-07-20 14:32:28,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 351 to 350. [2020-07-20 14:32:28,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 350 states. [2020-07-20 14:32:28,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 350 states to 350 states and 386 transitions. [2020-07-20 14:32:28,049 INFO L78 Accepts]: Start accepts. Automaton has 350 states and 386 transitions. Word has length 478 [2020-07-20 14:32:28,049 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:32:28,050 INFO L479 AbstractCegarLoop]: Abstraction has 350 states and 386 transitions. [2020-07-20 14:32:28,050 INFO L480 AbstractCegarLoop]: Interpolant automaton has 77 states. [2020-07-20 14:32:28,050 INFO L276 IsEmpty]: Start isEmpty. Operand 350 states and 386 transitions. [2020-07-20 14:32:28,053 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 492 [2020-07-20 14:32:28,053 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:32:28,053 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] [2020-07-20 14:32:28,256 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:32:28,256 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:32:28,256 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:32:28,257 INFO L82 PathProgramCache]: Analyzing trace with hash -1870510395, now seen corresponding path program 36 times [2020-07-20 14:32:28,257 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:32:28,258 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [298553059] [2020-07-20 14:32:28,258 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 14:32:28,389 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:32:28,389 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:32:28,392 INFO L263 TraceCheckSpWp]: Trace formula consists of 922 conjuncts, 81 conjunts are in the unsatisfiable core [2020-07-20 14:32:28,397 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:32:32,338 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:32:32,850 INFO L134 CoverageAnalysis]: Checked inductivity of 13916 backedges. 146 proven. 3258 refuted. 0 times theorem prover too weak. 10512 trivial. 0 not checked. [2020-07-20 14:32:32,850 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:32:33,048 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:32:33,669 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [298553059] [2020-07-20 14:32:33,669 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 14:32:33,670 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [79] total 79 [2020-07-20 14:32:33,670 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1888777014] [2020-07-20 14:32:33,670 INFO L459 AbstractCegarLoop]: Interpolant automaton has 79 states [2020-07-20 14:32:33,671 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:32:33,671 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2020-07-20 14:32:33,671 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=384, Invalid=6258, Unknown=0, NotChecked=0, Total=6642 [2020-07-20 14:32:33,672 INFO L87 Difference]: Start difference. First operand 350 states and 386 transitions. Second operand 79 states. [2020-07-20 14:32:45,130 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:32:45,131 INFO L93 Difference]: Finished difference Result 362 states and 399 transitions. [2020-07-20 14:32:45,132 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 115 states. [2020-07-20 14:32:45,132 INFO L78 Accepts]: Start accepts. Automaton has 79 states. Word has length 491 [2020-07-20 14:32:45,133 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:32:45,136 INFO L225 Difference]: With dead ends: 362 [2020-07-20 14:32:45,136 INFO L226 Difference]: Without dead ends: 360 [2020-07-20 14:32:45,137 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 542 GetRequests, 420 SyntacticMatches, 3 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5206 ImplicationChecksByTransitivity, 7.3s TimeCoverageRelationStatistics Valid=729, Invalid=13791, Unknown=0, NotChecked=0, Total=14520 [2020-07-20 14:32:45,138 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 360 states. [2020-07-20 14:32:45,158 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 360 to 359. [2020-07-20 14:32:45,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 359 states. [2020-07-20 14:32:45,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 359 states to 359 states and 396 transitions. [2020-07-20 14:32:45,160 INFO L78 Accepts]: Start accepts. Automaton has 359 states and 396 transitions. Word has length 491 [2020-07-20 14:32:45,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:32:45,161 INFO L479 AbstractCegarLoop]: Abstraction has 359 states and 396 transitions. [2020-07-20 14:32:45,161 INFO L480 AbstractCegarLoop]: Interpolant automaton has 79 states. [2020-07-20 14:32:45,161 INFO L276 IsEmpty]: Start isEmpty. Operand 359 states and 396 transitions. [2020-07-20 14:32:45,164 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 505 [2020-07-20 14:32:45,164 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:32:45,165 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] [2020-07-20 14:32:45,379 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:32:45,380 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:32:45,380 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:32:45,381 INFO L82 PathProgramCache]: Analyzing trace with hash -1324557555, now seen corresponding path program 37 times [2020-07-20 14:32:45,381 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:32:45,381 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1209476453] [2020-07-20 14:32:45,382 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 14:32:45,518 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:32:45,518 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:32:45,523 INFO L263 TraceCheckSpWp]: Trace formula consists of 946 conjuncts, 83 conjunts are in the unsatisfiable core [2020-07-20 14:32:45,527 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:32:49,915 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:32:50,470 INFO L134 CoverageAnalysis]: Checked inductivity of 14691 backedges. 150 proven. 3441 refuted. 0 times theorem prover too weak. 11100 trivial. 0 not checked. [2020-07-20 14:32:50,470 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:32:50,682 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:32:51,348 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1209476453] [2020-07-20 14:32:51,348 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 14:32:51,348 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [81] total 81 [2020-07-20 14:32:51,348 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [528616351] [2020-07-20 14:32:51,349 INFO L459 AbstractCegarLoop]: Interpolant automaton has 81 states [2020-07-20 14:32:51,349 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:32:51,350 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 81 interpolants. [2020-07-20 14:32:51,350 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=394, Invalid=6578, Unknown=0, NotChecked=0, Total=6972 [2020-07-20 14:32:51,350 INFO L87 Difference]: Start difference. First operand 359 states and 396 transitions. Second operand 81 states. [2020-07-20 14:33:04,751 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:33:04,751 INFO L93 Difference]: Finished difference Result 371 states and 409 transitions. [2020-07-20 14:33:04,753 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 118 states. [2020-07-20 14:33:04,753 INFO L78 Accepts]: Start accepts. Automaton has 81 states. Word has length 504 [2020-07-20 14:33:04,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:33:04,756 INFO L225 Difference]: With dead ends: 371 [2020-07-20 14:33:04,756 INFO L226 Difference]: Without dead ends: 369 [2020-07-20 14:33:04,757 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 556 GetRequests, 431 SyntacticMatches, 3 SemanticMatches, 122 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5480 ImplicationChecksByTransitivity, 8.2s TimeCoverageRelationStatistics Valid=748, Invalid=14504, Unknown=0, NotChecked=0, Total=15252 [2020-07-20 14:33:04,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 369 states. [2020-07-20 14:33:04,786 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 369 to 368. [2020-07-20 14:33:04,786 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 368 states. [2020-07-20 14:33:04,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 368 states to 368 states and 406 transitions. [2020-07-20 14:33:04,788 INFO L78 Accepts]: Start accepts. Automaton has 368 states and 406 transitions. Word has length 504 [2020-07-20 14:33:04,788 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:33:04,788 INFO L479 AbstractCegarLoop]: Abstraction has 368 states and 406 transitions. [2020-07-20 14:33:04,789 INFO L480 AbstractCegarLoop]: Interpolant automaton has 81 states. [2020-07-20 14:33:04,789 INFO L276 IsEmpty]: Start isEmpty. Operand 368 states and 406 transitions. [2020-07-20 14:33:04,792 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 518 [2020-07-20 14:33:04,792 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:33:04,793 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] [2020-07-20 14:33:05,008 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:33:05,009 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:33:05,009 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:33:05,010 INFO L82 PathProgramCache]: Analyzing trace with hash -5014587, now seen corresponding path program 38 times [2020-07-20 14:33:05,010 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:33:05,010 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1360225174] [2020-07-20 14:33:05,010 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 14:33:05,147 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:33:05,148 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:33:05,151 INFO L263 TraceCheckSpWp]: Trace formula consists of 970 conjuncts, 85 conjunts are in the unsatisfiable core [2020-07-20 14:33:05,158 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:33:09,992 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:33:10,582 INFO L134 CoverageAnalysis]: Checked inductivity of 15487 backedges. 154 proven. 3629 refuted. 0 times theorem prover too weak. 11704 trivial. 0 not checked. [2020-07-20 14:33:10,583 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:33:10,814 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:33:11,556 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1360225174] [2020-07-20 14:33:11,556 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 14:33:11,556 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [83] total 83 [2020-07-20 14:33:11,557 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [626235839] [2020-07-20 14:33:11,557 INFO L459 AbstractCegarLoop]: Interpolant automaton has 83 states [2020-07-20 14:33:11,557 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:33:11,558 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2020-07-20 14:33:11,558 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=404, Invalid=6906, Unknown=0, NotChecked=0, Total=7310 [2020-07-20 14:33:11,558 INFO L87 Difference]: Start difference. First operand 368 states and 406 transitions. Second operand 83 states. [2020-07-20 14:33:26,730 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:33:26,731 INFO L93 Difference]: Finished difference Result 380 states and 419 transitions. [2020-07-20 14:33:26,732 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 121 states. [2020-07-20 14:33:26,733 INFO L78 Accepts]: Start accepts. Automaton has 83 states. Word has length 517 [2020-07-20 14:33:26,733 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:33:26,735 INFO L225 Difference]: With dead ends: 380 [2020-07-20 14:33:26,735 INFO L226 Difference]: Without dead ends: 378 [2020-07-20 14:33:26,736 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 570 GetRequests, 442 SyntacticMatches, 3 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5761 ImplicationChecksByTransitivity, 9.1s TimeCoverageRelationStatistics Valid=767, Invalid=15235, Unknown=0, NotChecked=0, Total=16002 [2020-07-20 14:33:26,737 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 378 states. [2020-07-20 14:33:26,766 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 378 to 377. [2020-07-20 14:33:26,766 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 377 states. [2020-07-20 14:33:26,768 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 377 states to 377 states and 416 transitions. [2020-07-20 14:33:26,768 INFO L78 Accepts]: Start accepts. Automaton has 377 states and 416 transitions. Word has length 517 [2020-07-20 14:33:26,769 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:33:26,769 INFO L479 AbstractCegarLoop]: Abstraction has 377 states and 416 transitions. [2020-07-20 14:33:26,769 INFO L480 AbstractCegarLoop]: Interpolant automaton has 83 states. [2020-07-20 14:33:26,769 INFO L276 IsEmpty]: Start isEmpty. Operand 377 states and 416 transitions. [2020-07-20 14:33:26,772 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 531 [2020-07-20 14:33:26,772 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:33:26,773 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] [2020-07-20 14:33:26,979 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:33:26,979 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:33:26,979 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:33:26,980 INFO L82 PathProgramCache]: Analyzing trace with hash 607766029, now seen corresponding path program 39 times [2020-07-20 14:33:26,980 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:33:26,980 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1350162721] [2020-07-20 14:33:26,981 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 14:33:27,121 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:33:27,121 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:33:27,125 INFO L263 TraceCheckSpWp]: Trace formula consists of 994 conjuncts, 87 conjunts are in the unsatisfiable core [2020-07-20 14:33:27,130 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:33:32,759 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:33:33,391 INFO L134 CoverageAnalysis]: Checked inductivity of 16304 backedges. 158 proven. 3822 refuted. 0 times theorem prover too weak. 12324 trivial. 0 not checked. [2020-07-20 14:33:33,391 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:33:33,666 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:33:34,489 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1350162721] [2020-07-20 14:33:34,489 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 14:33:34,490 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [85] total 85 [2020-07-20 14:33:34,490 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [521855950] [2020-07-20 14:33:34,490 INFO L459 AbstractCegarLoop]: Interpolant automaton has 85 states [2020-07-20 14:33:34,490 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:33:34,491 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 85 interpolants. [2020-07-20 14:33:34,491 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=414, Invalid=7242, Unknown=0, NotChecked=0, Total=7656 [2020-07-20 14:33:34,491 INFO L87 Difference]: Start difference. First operand 377 states and 416 transitions. Second operand 85 states. [2020-07-20 14:33:54,391 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:33:54,391 INFO L93 Difference]: Finished difference Result 389 states and 429 transitions. [2020-07-20 14:33:54,393 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 124 states. [2020-07-20 14:33:54,394 INFO L78 Accepts]: Start accepts. Automaton has 85 states. Word has length 530 [2020-07-20 14:33:54,395 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:33:54,397 INFO L225 Difference]: With dead ends: 389 [2020-07-20 14:33:54,397 INFO L226 Difference]: Without dead ends: 387 [2020-07-20 14:33:54,398 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 584 GetRequests, 453 SyntacticMatches, 3 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6049 ImplicationChecksByTransitivity, 10.7s TimeCoverageRelationStatistics Valid=786, Invalid=15984, Unknown=0, NotChecked=0, Total=16770 [2020-07-20 14:33:54,399 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 387 states. [2020-07-20 14:33:54,421 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 387 to 386. [2020-07-20 14:33:54,422 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 386 states. [2020-07-20 14:33:54,423 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 386 states to 386 states and 426 transitions. [2020-07-20 14:33:54,423 INFO L78 Accepts]: Start accepts. Automaton has 386 states and 426 transitions. Word has length 530 [2020-07-20 14:33:54,423 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:33:54,423 INFO L479 AbstractCegarLoop]: Abstraction has 386 states and 426 transitions. [2020-07-20 14:33:54,423 INFO L480 AbstractCegarLoop]: Interpolant automaton has 85 states. [2020-07-20 14:33:54,423 INFO L276 IsEmpty]: Start isEmpty. Operand 386 states and 426 transitions. [2020-07-20 14:33:54,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 544 [2020-07-20 14:33:54,426 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:33:54,426 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] [2020-07-20 14:33:54,627 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:33:54,627 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:33:54,628 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:33:54,628 INFO L82 PathProgramCache]: Analyzing trace with hash -1407422267, now seen corresponding path program 40 times [2020-07-20 14:33:54,628 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:33:54,629 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1266819643] [2020-07-20 14:33:54,629 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 14:33:54,774 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:33:54,774 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:33:54,778 INFO L263 TraceCheckSpWp]: Trace formula consists of 1018 conjuncts, 89 conjunts are in the unsatisfiable core [2020-07-20 14:33:54,783 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:34:01,093 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:34:01,768 INFO L134 CoverageAnalysis]: Checked inductivity of 17142 backedges. 162 proven. 4020 refuted. 0 times theorem prover too weak. 12960 trivial. 0 not checked. [2020-07-20 14:34:01,769 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:34:02,060 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:34:02,972 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1266819643] [2020-07-20 14:34:02,973 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 14:34:02,973 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [87] total 87 [2020-07-20 14:34:02,973 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [62270533] [2020-07-20 14:34:02,974 INFO L459 AbstractCegarLoop]: Interpolant automaton has 87 states [2020-07-20 14:34:02,974 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:34:02,974 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2020-07-20 14:34:02,975 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=424, Invalid=7586, Unknown=0, NotChecked=0, Total=8010 [2020-07-20 14:34:02,975 INFO L87 Difference]: Start difference. First operand 386 states and 426 transitions. Second operand 87 states. [2020-07-20 14:34:23,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:34:23,457 INFO L93 Difference]: Finished difference Result 398 states and 439 transitions. [2020-07-20 14:34:23,459 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 127 states. [2020-07-20 14:34:23,459 INFO L78 Accepts]: Start accepts. Automaton has 87 states. Word has length 543 [2020-07-20 14:34:23,460 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:34:23,463 INFO L225 Difference]: With dead ends: 398 [2020-07-20 14:34:23,463 INFO L226 Difference]: Without dead ends: 396 [2020-07-20 14:34:23,464 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 598 GetRequests, 464 SyntacticMatches, 3 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6344 ImplicationChecksByTransitivity, 11.5s TimeCoverageRelationStatistics Valid=805, Invalid=16751, Unknown=0, NotChecked=0, Total=17556 [2020-07-20 14:34:23,464 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 396 states. [2020-07-20 14:34:23,488 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 396 to 395. [2020-07-20 14:34:23,488 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 395 states. [2020-07-20 14:34:23,489 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 395 states to 395 states and 436 transitions. [2020-07-20 14:34:23,489 INFO L78 Accepts]: Start accepts. Automaton has 395 states and 436 transitions. Word has length 543 [2020-07-20 14:34:23,490 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:34:23,490 INFO L479 AbstractCegarLoop]: Abstraction has 395 states and 436 transitions. [2020-07-20 14:34:23,490 INFO L480 AbstractCegarLoop]: Interpolant automaton has 87 states. [2020-07-20 14:34:23,490 INFO L276 IsEmpty]: Start isEmpty. Operand 395 states and 436 transitions. [2020-07-20 14:34:23,494 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 557 [2020-07-20 14:34:23,494 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:34:23,495 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] [2020-07-20 14:34:23,708 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:34:23,709 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:34:23,709 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:34:23,709 INFO L82 PathProgramCache]: Analyzing trace with hash 583463181, now seen corresponding path program 41 times [2020-07-20 14:34:23,710 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:34:23,710 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [314141134] [2020-07-20 14:34:23,710 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 14:34:23,880 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:34:23,880 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:34:23,886 INFO L263 TraceCheckSpWp]: Trace formula consists of 1042 conjuncts, 91 conjunts are in the unsatisfiable core [2020-07-20 14:34:23,892 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:34:30,808 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:34:31,542 INFO L134 CoverageAnalysis]: Checked inductivity of 18001 backedges. 166 proven. 4223 refuted. 0 times theorem prover too weak. 13612 trivial. 0 not checked. [2020-07-20 14:34:31,542 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:34:31,861 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:34:32,844 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [314141134] [2020-07-20 14:34:32,845 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 14:34:32,845 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [89] total 89 [2020-07-20 14:34:32,846 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2015295731] [2020-07-20 14:34:32,846 INFO L459 AbstractCegarLoop]: Interpolant automaton has 89 states [2020-07-20 14:34:32,847 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:34:32,847 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2020-07-20 14:34:32,848 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=434, Invalid=7938, Unknown=0, NotChecked=0, Total=8372 [2020-07-20 14:34:32,848 INFO L87 Difference]: Start difference. First operand 395 states and 436 transitions. Second operand 89 states. [2020-07-20 14:34:56,616 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:34:56,616 INFO L93 Difference]: Finished difference Result 407 states and 449 transitions. [2020-07-20 14:34:56,619 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 130 states. [2020-07-20 14:34:56,619 INFO L78 Accepts]: Start accepts. Automaton has 89 states. Word has length 556 [2020-07-20 14:34:56,620 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:34:56,622 INFO L225 Difference]: With dead ends: 407 [2020-07-20 14:34:56,622 INFO L226 Difference]: Without dead ends: 405 [2020-07-20 14:34:56,623 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 612 GetRequests, 475 SyntacticMatches, 3 SemanticMatches, 134 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6646 ImplicationChecksByTransitivity, 12.7s TimeCoverageRelationStatistics Valid=824, Invalid=17536, Unknown=0, NotChecked=0, Total=18360 [2020-07-20 14:34:56,624 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 405 states. [2020-07-20 14:34:56,655 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 405 to 404. [2020-07-20 14:34:56,656 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 404 states. [2020-07-20 14:34:56,657 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 404 states to 404 states and 446 transitions. [2020-07-20 14:34:56,657 INFO L78 Accepts]: Start accepts. Automaton has 404 states and 446 transitions. Word has length 556 [2020-07-20 14:34:56,658 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:34:56,658 INFO L479 AbstractCegarLoop]: Abstraction has 404 states and 446 transitions. [2020-07-20 14:34:56,658 INFO L480 AbstractCegarLoop]: Interpolant automaton has 89 states. [2020-07-20 14:34:56,658 INFO L276 IsEmpty]: Start isEmpty. Operand 404 states and 446 transitions. [2020-07-20 14:34:56,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 570 [2020-07-20 14:34:56,661 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:34:56,662 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] [2020-07-20 14:34:56,862 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:34:56,863 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:34:56,863 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:34:56,864 INFO L82 PathProgramCache]: Analyzing trace with hash -1148377659, now seen corresponding path program 42 times [2020-07-20 14:34:56,864 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:34:56,864 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1696922924] [2020-07-20 14:34:56,865 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 14:34:57,019 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:34:57,020 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:34:57,025 INFO L263 TraceCheckSpWp]: Trace formula consists of 1066 conjuncts, 93 conjunts are in the unsatisfiable core [2020-07-20 14:34:57,031 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:35:04,883 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:35:05,747 INFO L134 CoverageAnalysis]: Checked inductivity of 18881 backedges. 170 proven. 4431 refuted. 0 times theorem prover too weak. 14280 trivial. 0 not checked. [2020-07-20 14:35:05,747 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:35:06,120 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:35:07,289 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1696922924] [2020-07-20 14:35:07,289 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 14:35:07,290 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [91] total 91 [2020-07-20 14:35:07,290 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [715388959] [2020-07-20 14:35:07,291 INFO L459 AbstractCegarLoop]: Interpolant automaton has 91 states [2020-07-20 14:35:07,291 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:35:07,291 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 91 interpolants. [2020-07-20 14:35:07,292 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=444, Invalid=8298, Unknown=0, NotChecked=0, Total=8742 [2020-07-20 14:35:07,292 INFO L87 Difference]: Start difference. First operand 404 states and 446 transitions. Second operand 91 states. [2020-07-20 14:35:34,713 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:35:34,713 INFO L93 Difference]: Finished difference Result 416 states and 459 transitions. [2020-07-20 14:35:34,716 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 133 states. [2020-07-20 14:35:34,717 INFO L78 Accepts]: Start accepts. Automaton has 91 states. Word has length 569 [2020-07-20 14:35:34,718 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:35:34,720 INFO L225 Difference]: With dead ends: 416 [2020-07-20 14:35:34,721 INFO L226 Difference]: Without dead ends: 414 [2020-07-20 14:35:34,722 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 626 GetRequests, 486 SyntacticMatches, 3 SemanticMatches, 137 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6955 ImplicationChecksByTransitivity, 14.6s TimeCoverageRelationStatistics Valid=843, Invalid=18339, Unknown=0, NotChecked=0, Total=19182 [2020-07-20 14:35:34,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 414 states. [2020-07-20 14:35:34,745 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 414 to 413. [2020-07-20 14:35:34,745 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 413 states. [2020-07-20 14:35:34,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 413 states to 413 states and 456 transitions. [2020-07-20 14:35:34,747 INFO L78 Accepts]: Start accepts. Automaton has 413 states and 456 transitions. Word has length 569 [2020-07-20 14:35:34,748 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:35:34,748 INFO L479 AbstractCegarLoop]: Abstraction has 413 states and 456 transitions. [2020-07-20 14:35:34,748 INFO L480 AbstractCegarLoop]: Interpolant automaton has 91 states. [2020-07-20 14:35:34,748 INFO L276 IsEmpty]: Start isEmpty. Operand 413 states and 456 transitions. [2020-07-20 14:35:34,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 583 [2020-07-20 14:35:34,751 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:35:34,751 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] [2020-07-20 14:35:34,952 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:35:34,952 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:35:34,953 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:35:34,953 INFO L82 PathProgramCache]: Analyzing trace with hash 2028231693, now seen corresponding path program 43 times [2020-07-20 14:35:34,954 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:35:34,954 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1045173673] [2020-07-20 14:35:34,954 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 14:35:35,112 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:35:35,113 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:35:35,117 INFO L263 TraceCheckSpWp]: Trace formula consists of 1090 conjuncts, 95 conjunts are in the unsatisfiable core [2020-07-20 14:35:35,123 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:35:43,897 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:35:44,738 INFO L134 CoverageAnalysis]: Checked inductivity of 19782 backedges. 174 proven. 4644 refuted. 0 times theorem prover too weak. 14964 trivial. 0 not checked. [2020-07-20 14:35:44,738 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:35:45,138 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:35:46,396 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1045173673] [2020-07-20 14:35:46,397 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 14:35:46,397 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [93] total 93 [2020-07-20 14:35:46,397 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [782714199] [2020-07-20 14:35:46,398 INFO L459 AbstractCegarLoop]: Interpolant automaton has 93 states [2020-07-20 14:35:46,398 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:35:46,398 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 93 interpolants. [2020-07-20 14:35:46,399 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=454, Invalid=8666, Unknown=0, NotChecked=0, Total=9120 [2020-07-20 14:35:46,399 INFO L87 Difference]: Start difference. First operand 413 states and 456 transitions. Second operand 93 states. [2020-07-20 14:36:18,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:36:18,868 INFO L93 Difference]: Finished difference Result 425 states and 469 transitions. [2020-07-20 14:36:18,872 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 136 states. [2020-07-20 14:36:18,872 INFO L78 Accepts]: Start accepts. Automaton has 93 states. Word has length 582 [2020-07-20 14:36:18,873 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:36:18,875 INFO L225 Difference]: With dead ends: 425 [2020-07-20 14:36:18,876 INFO L226 Difference]: Without dead ends: 423 [2020-07-20 14:36:18,877 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 640 GetRequests, 497 SyntacticMatches, 3 SemanticMatches, 140 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7271 ImplicationChecksByTransitivity, 16.2s TimeCoverageRelationStatistics Valid=862, Invalid=19160, Unknown=0, NotChecked=0, Total=20022 [2020-07-20 14:36:18,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 423 states. [2020-07-20 14:36:18,903 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 423 to 422. [2020-07-20 14:36:18,903 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 422 states. [2020-07-20 14:36:18,905 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 422 states to 422 states and 466 transitions. [2020-07-20 14:36:18,905 INFO L78 Accepts]: Start accepts. Automaton has 422 states and 466 transitions. Word has length 582 [2020-07-20 14:36:18,906 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:36:18,906 INFO L479 AbstractCegarLoop]: Abstraction has 422 states and 466 transitions. [2020-07-20 14:36:18,906 INFO L480 AbstractCegarLoop]: Interpolant automaton has 93 states. [2020-07-20 14:36:18,906 INFO L276 IsEmpty]: Start isEmpty. Operand 422 states and 466 transitions. [2020-07-20 14:36:18,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 596 [2020-07-20 14:36:18,910 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:36:18,910 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] [2020-07-20 14:36:19,111 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:36:19,112 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:36:19,112 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:36:19,112 INFO L82 PathProgramCache]: Analyzing trace with hash -1344955707, now seen corresponding path program 44 times [2020-07-20 14:36:19,113 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:36:19,113 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2022934413] [2020-07-20 14:36:19,113 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 14:36:19,274 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:36:19,274 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:36:19,279 INFO L263 TraceCheckSpWp]: Trace formula consists of 1114 conjuncts, 97 conjunts are in the unsatisfiable core [2020-07-20 14:36:19,284 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:36:29,371 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:36:30,269 INFO L134 CoverageAnalysis]: Checked inductivity of 20704 backedges. 178 proven. 4862 refuted. 0 times theorem prover too weak. 15664 trivial. 0 not checked. [2020-07-20 14:36:30,269 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:36:30,732 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:36:32,192 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2022934413] [2020-07-20 14:36:32,192 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 14:36:32,192 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [95] total 95 [2020-07-20 14:36:32,193 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1577435652] [2020-07-20 14:36:32,193 INFO L459 AbstractCegarLoop]: Interpolant automaton has 95 states [2020-07-20 14:36:32,193 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:36:32,194 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 95 interpolants. [2020-07-20 14:36:32,194 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=464, Invalid=9042, Unknown=0, NotChecked=0, Total=9506 [2020-07-20 14:36:32,194 INFO L87 Difference]: Start difference. First operand 422 states and 466 transitions. Second operand 95 states. [2020-07-20 14:37:08,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:37:08,907 INFO L93 Difference]: Finished difference Result 434 states and 479 transitions. [2020-07-20 14:37:08,911 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 139 states. [2020-07-20 14:37:08,911 INFO L78 Accepts]: Start accepts. Automaton has 95 states. Word has length 595 [2020-07-20 14:37:08,912 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:37:08,915 INFO L225 Difference]: With dead ends: 434 [2020-07-20 14:37:08,915 INFO L226 Difference]: Without dead ends: 432 [2020-07-20 14:37:08,916 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 654 GetRequests, 508 SyntacticMatches, 3 SemanticMatches, 143 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7594 ImplicationChecksByTransitivity, 18.4s TimeCoverageRelationStatistics Valid=881, Invalid=19999, Unknown=0, NotChecked=0, Total=20880 [2020-07-20 14:37:08,917 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 432 states. [2020-07-20 14:37:08,953 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 432 to 431. [2020-07-20 14:37:08,953 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 431 states. [2020-07-20 14:37:08,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 431 states to 431 states and 476 transitions. [2020-07-20 14:37:08,955 INFO L78 Accepts]: Start accepts. Automaton has 431 states and 476 transitions. Word has length 595 [2020-07-20 14:37:08,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:37:08,956 INFO L479 AbstractCegarLoop]: Abstraction has 431 states and 476 transitions. [2020-07-20 14:37:08,956 INFO L480 AbstractCegarLoop]: Interpolant automaton has 95 states. [2020-07-20 14:37:08,956 INFO L276 IsEmpty]: Start isEmpty. Operand 431 states and 476 transitions. [2020-07-20 14:37:08,961 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 609 [2020-07-20 14:37:08,961 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:37:08,961 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] [2020-07-20 14:37:09,174 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:37:09,175 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:37:09,175 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:37:09,176 INFO L82 PathProgramCache]: Analyzing trace with hash 381814541, now seen corresponding path program 45 times [2020-07-20 14:37:09,176 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:37:09,176 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2021947145] [2020-07-20 14:37:09,177 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 14:37:09,344 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:37:09,344 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:37:09,349 INFO L263 TraceCheckSpWp]: Trace formula consists of 1138 conjuncts, 99 conjunts are in the unsatisfiable core [2020-07-20 14:37:09,355 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:37:20,706 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:37:21,727 INFO L134 CoverageAnalysis]: Checked inductivity of 21647 backedges. 182 proven. 5085 refuted. 0 times theorem prover too weak. 16380 trivial. 0 not checked. [2020-07-20 14:37:21,727 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:37:22,220 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:37:23,755 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2021947145] [2020-07-20 14:37:23,755 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 14:37:23,755 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [97] total 97 [2020-07-20 14:37:23,756 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1099887611] [2020-07-20 14:37:23,757 INFO L459 AbstractCegarLoop]: Interpolant automaton has 97 states [2020-07-20 14:37:23,757 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:37:23,757 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 97 interpolants. [2020-07-20 14:37:23,758 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=474, Invalid=9426, Unknown=0, NotChecked=0, Total=9900 [2020-07-20 14:37:23,758 INFO L87 Difference]: Start difference. First operand 431 states and 476 transitions. Second operand 97 states. [2020-07-20 14:38:07,187 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:38:07,187 INFO L93 Difference]: Finished difference Result 443 states and 489 transitions. [2020-07-20 14:38:07,192 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 142 states. [2020-07-20 14:38:07,192 INFO L78 Accepts]: Start accepts. Automaton has 97 states. Word has length 608 [2020-07-20 14:38:07,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:38:07,195 INFO L225 Difference]: With dead ends: 443 [2020-07-20 14:38:07,196 INFO L226 Difference]: Without dead ends: 441 [2020-07-20 14:38:07,197 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 668 GetRequests, 519 SyntacticMatches, 3 SemanticMatches, 146 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7924 ImplicationChecksByTransitivity, 20.8s TimeCoverageRelationStatistics Valid=900, Invalid=20856, Unknown=0, NotChecked=0, Total=21756 [2020-07-20 14:38:07,197 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 441 states. [2020-07-20 14:38:07,238 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 441 to 440. [2020-07-20 14:38:07,239 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 440 states. [2020-07-20 14:38:07,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 440 states to 440 states and 486 transitions. [2020-07-20 14:38:07,241 INFO L78 Accepts]: Start accepts. Automaton has 440 states and 486 transitions. Word has length 608 [2020-07-20 14:38:07,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:38:07,242 INFO L479 AbstractCegarLoop]: Abstraction has 440 states and 486 transitions. [2020-07-20 14:38:07,242 INFO L480 AbstractCegarLoop]: Interpolant automaton has 97 states. [2020-07-20 14:38:07,242 INFO L276 IsEmpty]: Start isEmpty. Operand 440 states and 486 transitions. [2020-07-20 14:38:07,248 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 622 [2020-07-20 14:38:07,248 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:38:07,249 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] [2020-07-20 14:38:07,462 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:38:07,463 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:38:07,463 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:38:07,464 INFO L82 PathProgramCache]: Analyzing trace with hash 1724239813, now seen corresponding path program 46 times [2020-07-20 14:38:07,464 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:38:07,465 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1244992751] [2020-07-20 14:38:07,465 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 14:38:07,636 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:38:07,637 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:38:07,641 INFO L263 TraceCheckSpWp]: Trace formula consists of 1162 conjuncts, 101 conjunts are in the unsatisfiable core [2020-07-20 14:38:07,647 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:38:20,996 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:38:22,058 INFO L134 CoverageAnalysis]: Checked inductivity of 22611 backedges. 186 proven. 5313 refuted. 0 times theorem prover too weak. 17112 trivial. 0 not checked. [2020-07-20 14:38:22,059 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:38:22,620 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:38:24,372 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1244992751] [2020-07-20 14:38:24,372 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 14:38:24,372 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [99] total 99 [2020-07-20 14:38:24,373 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1331321296] [2020-07-20 14:38:24,373 INFO L459 AbstractCegarLoop]: Interpolant automaton has 99 states [2020-07-20 14:38:24,374 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:38:24,374 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 99 interpolants. [2020-07-20 14:38:24,375 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=484, Invalid=9818, Unknown=0, NotChecked=0, Total=10302 [2020-07-20 14:38:24,375 INFO L87 Difference]: Start difference. First operand 440 states and 486 transitions. Second operand 99 states. [2020-07-20 14:39:13,491 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:39:13,491 INFO L93 Difference]: Finished difference Result 452 states and 499 transitions. [2020-07-20 14:39:13,496 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 145 states. [2020-07-20 14:39:13,497 INFO L78 Accepts]: Start accepts. Automaton has 99 states. Word has length 621 [2020-07-20 14:39:13,498 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:39:13,500 INFO L225 Difference]: With dead ends: 452 [2020-07-20 14:39:13,500 INFO L226 Difference]: Without dead ends: 450 [2020-07-20 14:39:13,502 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 682 GetRequests, 530 SyntacticMatches, 3 SemanticMatches, 149 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8261 ImplicationChecksByTransitivity, 24.1s TimeCoverageRelationStatistics Valid=919, Invalid=21731, Unknown=0, NotChecked=0, Total=22650 [2020-07-20 14:39:13,503 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 450 states. [2020-07-20 14:39:13,541 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 450 to 449. [2020-07-20 14:39:13,541 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 449 states. [2020-07-20 14:39:13,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 449 states to 449 states and 496 transitions. [2020-07-20 14:39:13,543 INFO L78 Accepts]: Start accepts. Automaton has 449 states and 496 transitions. Word has length 621 [2020-07-20 14:39:13,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:39:13,543 INFO L479 AbstractCegarLoop]: Abstraction has 449 states and 496 transitions. [2020-07-20 14:39:13,544 INFO L480 AbstractCegarLoop]: Interpolant automaton has 99 states. [2020-07-20 14:39:13,544 INFO L276 IsEmpty]: Start isEmpty. Operand 449 states and 496 transitions. [2020-07-20 14:39:13,547 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 635 [2020-07-20 14:39:13,547 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:39:13,548 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] [2020-07-20 14:39:13,748 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:39:13,749 INFO L427 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:39:13,749 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:39:13,750 INFO L82 PathProgramCache]: Analyzing trace with hash 277869069, now seen corresponding path program 47 times [2020-07-20 14:39:13,750 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:39:13,750 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1127253211] [2020-07-20 14:39:13,751 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 14:39:13,932 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:39:13,933 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:39:13,939 INFO L263 TraceCheckSpWp]: Trace formula consists of 1186 conjuncts, 103 conjunts are in the unsatisfiable core [2020-07-20 14:39:13,944 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:39:28,687 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:39:29,899 INFO L134 CoverageAnalysis]: Checked inductivity of 23596 backedges. 190 proven. 5546 refuted. 0 times theorem prover too weak. 17860 trivial. 0 not checked. [2020-07-20 14:39:29,900 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:39:30,559 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:39:32,570 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1127253211] [2020-07-20 14:39:32,570 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 14:39:32,571 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [101] total 101 [2020-07-20 14:39:32,571 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2105380677] [2020-07-20 14:39:32,571 INFO L459 AbstractCegarLoop]: Interpolant automaton has 101 states [2020-07-20 14:39:32,571 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:39:32,572 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2020-07-20 14:39:32,572 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=494, Invalid=10218, Unknown=0, NotChecked=0, Total=10712 [2020-07-20 14:39:32,572 INFO L87 Difference]: Start difference. First operand 449 states and 496 transitions. Second operand 101 states. [2020-07-20 14:40:29,132 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:40:29,132 INFO L93 Difference]: Finished difference Result 461 states and 509 transitions. [2020-07-20 14:40:29,137 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 148 states. [2020-07-20 14:40:29,137 INFO L78 Accepts]: Start accepts. Automaton has 101 states. Word has length 634 [2020-07-20 14:40:29,138 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:40:29,140 INFO L225 Difference]: With dead ends: 461 [2020-07-20 14:40:29,140 INFO L226 Difference]: Without dead ends: 459 [2020-07-20 14:40:29,142 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 696 GetRequests, 541 SyntacticMatches, 3 SemanticMatches, 152 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8605 ImplicationChecksByTransitivity, 27.1s TimeCoverageRelationStatistics Valid=938, Invalid=22624, Unknown=0, NotChecked=0, Total=23562 [2020-07-20 14:40:29,142 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 459 states. [2020-07-20 14:40:29,173 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 459 to 458. [2020-07-20 14:40:29,173 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 458 states. [2020-07-20 14:40:29,175 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 458 states to 458 states and 506 transitions. [2020-07-20 14:40:29,175 INFO L78 Accepts]: Start accepts. Automaton has 458 states and 506 transitions. Word has length 634 [2020-07-20 14:40:29,176 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:40:29,176 INFO L479 AbstractCegarLoop]: Abstraction has 458 states and 506 transitions. [2020-07-20 14:40:29,176 INFO L480 AbstractCegarLoop]: Interpolant automaton has 101 states. [2020-07-20 14:40:29,176 INFO L276 IsEmpty]: Start isEmpty. Operand 458 states and 506 transitions. [2020-07-20 14:40:29,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 648 [2020-07-20 14:40:29,181 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:40:29,181 INFO L422 BasicCegarLoop]: trace histogram [98, 97, 97, 49, 49, 49, 49, 48, 48, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:40:29,394 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:40:29,395 INFO L427 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:40:29,395 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:40:29,396 INFO L82 PathProgramCache]: Analyzing trace with hash 439207109, now seen corresponding path program 48 times [2020-07-20 14:40:29,396 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:40:29,396 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [137198906] [2020-07-20 14:40:29,397 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 51 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:40:29,578 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:40:29,578 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:40:29,585 INFO L263 TraceCheckSpWp]: Trace formula consists of 1210 conjuncts, 105 conjunts are in the unsatisfiable core [2020-07-20 14:40:29,590 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:40:29,916 WARN L193 SmtUtils]: Spent 212.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 14:40:46,071 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:40:47,295 INFO L134 CoverageAnalysis]: Checked inductivity of 24602 backedges. 194 proven. 5784 refuted. 0 times theorem prover too weak. 18624 trivial. 0 not checked. [2020-07-20 14:40:47,295 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:40:47,985 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:40:49,922 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [137198906] [2020-07-20 14:40:49,922 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 14:40:49,923 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [103] total 103 [2020-07-20 14:40:49,923 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1961745862] [2020-07-20 14:40:49,924 INFO L459 AbstractCegarLoop]: Interpolant automaton has 103 states [2020-07-20 14:40:49,924 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:40:49,924 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 103 interpolants. [2020-07-20 14:40:49,925 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=504, Invalid=10626, Unknown=0, NotChecked=0, Total=11130 [2020-07-20 14:40:49,925 INFO L87 Difference]: Start difference. First operand 458 states and 506 transitions. Second operand 103 states. [2020-07-20 14:41:49,725 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:41:49,726 INFO L93 Difference]: Finished difference Result 470 states and 519 transitions. [2020-07-20 14:41:49,731 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 151 states. [2020-07-20 14:41:49,732 INFO L78 Accepts]: Start accepts. Automaton has 103 states. Word has length 647 [2020-07-20 14:41:49,733 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:41:49,734 INFO L225 Difference]: With dead ends: 470 [2020-07-20 14:41:49,735 INFO L226 Difference]: Without dead ends: 468 [2020-07-20 14:41:49,736 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 710 GetRequests, 552 SyntacticMatches, 3 SemanticMatches, 155 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8956 ImplicationChecksByTransitivity, 29.1s TimeCoverageRelationStatistics Valid=957, Invalid=23535, Unknown=0, NotChecked=0, Total=24492 [2020-07-20 14:41:49,736 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 468 states. [2020-07-20 14:41:49,768 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 468 to 467. [2020-07-20 14:41:49,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 467 states. [2020-07-20 14:41:49,774 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 467 states to 467 states and 516 transitions. [2020-07-20 14:41:49,775 INFO L78 Accepts]: Start accepts. Automaton has 467 states and 516 transitions. Word has length 647 [2020-07-20 14:41:49,775 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:41:49,775 INFO L479 AbstractCegarLoop]: Abstraction has 467 states and 516 transitions. [2020-07-20 14:41:49,776 INFO L480 AbstractCegarLoop]: Interpolant automaton has 103 states. [2020-07-20 14:41:49,776 INFO L276 IsEmpty]: Start isEmpty. Operand 467 states and 516 transitions. [2020-07-20 14:41:49,781 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 661 [2020-07-20 14:41:49,781 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:41:49,782 INFO L422 BasicCegarLoop]: trace histogram [100, 99, 99, 50, 50, 50, 50, 49, 49, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:41:49,994 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 51 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:41:49,995 INFO L427 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:41:49,995 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:41:49,996 INFO L82 PathProgramCache]: Analyzing trace with hash -1635902195, now seen corresponding path program 49 times [2020-07-20 14:41:49,997 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:41:49,997 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [233694130] [2020-07-20 14:41:49,997 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 52 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:41:50,177 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:41:50,178 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:41:50,183 INFO L263 TraceCheckSpWp]: Trace formula consists of 1234 conjuncts, 107 conjunts are in the unsatisfiable core [2020-07-20 14:41:50,189 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:42:08,059 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:42:09,430 INFO L134 CoverageAnalysis]: Checked inductivity of 25629 backedges. 198 proven. 6027 refuted. 0 times theorem prover too weak. 19404 trivial. 0 not checked. [2020-07-20 14:42:09,430 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:42:10,237 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:42:12,625 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [233694130] [2020-07-20 14:42:12,625 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 14:42:12,625 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [105] total 105 [2020-07-20 14:42:12,626 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [198008906] [2020-07-20 14:42:12,626 INFO L459 AbstractCegarLoop]: Interpolant automaton has 105 states [2020-07-20 14:42:12,627 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:42:12,627 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 105 interpolants. [2020-07-20 14:42:12,627 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=514, Invalid=11042, Unknown=0, NotChecked=0, Total=11556 [2020-07-20 14:42:12,627 INFO L87 Difference]: Start difference. First operand 467 states and 516 transitions. Second operand 105 states.