/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 BIGGEST_EQUIVALENCE_CLASS --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/fragtest_simple.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 23:18:44,709 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 23:18:44,712 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 23:18:44,728 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 23:18:44,728 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 23:18:44,729 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 23:18:44,730 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 23:18:44,732 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 23:18:44,734 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 23:18:44,735 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 23:18:44,736 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 23:18:44,737 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 23:18:44,737 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 23:18:44,738 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 23:18:44,739 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 23:18:44,740 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 23:18:44,741 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 23:18:44,742 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 23:18:44,744 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 23:18:44,746 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 23:18:44,750 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 23:18:44,751 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 23:18:44,756 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 23:18:44,757 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 23:18:44,762 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 23:18:44,777 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 23:18:44,779 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 23:18:44,780 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 23:18:44,781 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 23:18:44,810 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 23:18:44,810 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 23:18:44,812 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 23:18:44,813 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 23:18:44,813 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 23:18:44,813 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 23:18:44,813 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 23:18:44,813 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 23:18:44,814 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 23:18:44,814 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 23:18:44,815 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 23:18:44,815 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 23:18:44,815 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 23:18:44,816 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 23:18:44,816 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 23:18:44,816 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 23:18:44,817 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 23:18:44,817 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 23:18:44,817 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 23:18:44,817 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 23:18:44,817 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 23:18:44,818 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 23:18:44,818 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 23:18:44,818 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 23:18:44,818 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 23:18:44,819 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 23:18:44,819 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:18:44,819 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 23:18:44,819 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 23:18:44,819 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 -> BIGGEST_EQUIVALENCE_CLASS 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 [2020-07-21 23:18:45,160 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 23:18:45,175 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 23:18:45,178 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 23:18:45,179 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 23:18:45,179 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 23:18:45,180 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-invgen/fragtest_simple.i [2020-07-21 23:18:45,251 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6ef2b9fcf/42c5c53408c0419b8df4e6115049233e/FLAG065141776 [2020-07-21 23:18:45,709 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 23:18:45,710 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-invgen/fragtest_simple.i [2020-07-21 23:18:45,715 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6ef2b9fcf/42c5c53408c0419b8df4e6115049233e/FLAG065141776 [2020-07-21 23:18:46,087 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6ef2b9fcf/42c5c53408c0419b8df4e6115049233e [2020-07-21 23:18:46,097 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 23:18:46,100 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 23:18:46,101 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 23:18:46,101 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 23:18:46,105 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 23:18:46,106 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 11:18:46" (1/1) ... [2020-07-21 23:18:46,109 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3062c9f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:18:46, skipping insertion in model container [2020-07-21 23:18:46,109 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 11:18:46" (1/1) ... [2020-07-21 23:18:46,116 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 23:18:46,133 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 23:18:46,303 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 23:18:46,308 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 23:18:46,328 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 23:18:46,343 INFO L208 MainTranslator]: Completed translation [2020-07-21 23:18:46,343 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:18:46 WrapperNode [2020-07-21 23:18:46,344 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 23:18:46,344 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 23:18:46,345 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 23:18:46,345 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 23:18:46,359 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:18:46" (1/1) ... [2020-07-21 23:18:46,360 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:18:46" (1/1) ... [2020-07-21 23:18:46,365 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:18:46" (1/1) ... [2020-07-21 23:18:46,366 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:18:46" (1/1) ... [2020-07-21 23:18:46,443 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:18:46" (1/1) ... [2020-07-21 23:18:46,452 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:18:46" (1/1) ... [2020-07-21 23:18:46,459 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:18:46" (1/1) ... [2020-07-21 23:18:46,467 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 23:18:46,467 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 23:18:46,467 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 23:18:46,468 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 23:18:46,471 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:18:46" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 23:18:46,539 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 23:18:46,540 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 23:18:46,540 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-21 23:18:46,540 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-21 23:18:46,540 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 23:18:46,540 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 23:18:46,540 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-21 23:18:46,540 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-21 23:18:46,541 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 23:18:46,541 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 23:18:46,541 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 23:18:46,541 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 23:18:46,541 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 23:18:46,829 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 23:18:46,829 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-07-21 23:18:46,833 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 11:18:46 BoogieIcfgContainer [2020-07-21 23:18:46,833 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 23:18:46,835 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 23:18:46,835 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 23:18:46,838 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 23:18:46,838 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 11:18:46" (1/3) ... [2020-07-21 23:18:46,839 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@53b7da8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 11:18:46, skipping insertion in model container [2020-07-21 23:18:46,839 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:18:46" (2/3) ... [2020-07-21 23:18:46,839 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@53b7da8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 11:18:46, skipping insertion in model container [2020-07-21 23:18:46,840 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 11:18:46" (3/3) ... [2020-07-21 23:18:46,841 INFO L109 eAbstractionObserver]: Analyzing ICFG fragtest_simple.i [2020-07-21 23:18:46,852 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 23:18:46,872 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 23:18:46,886 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 23:18:46,908 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 23:18:46,908 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 23:18:46,908 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 23:18:46,908 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 23:18:46,908 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 23:18:46,908 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 23:18:46,909 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 23:18:46,909 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 23:18:46,926 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states. [2020-07-21 23:18:46,932 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-07-21 23:18:46,932 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:18:46,933 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:18:46,933 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:18:46,938 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:18:46,938 INFO L82 PathProgramCache]: Analyzing trace with hash 317368997, now seen corresponding path program 1 times [2020-07-21 23:18:46,944 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:18:46,945 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1691576555] [2020-07-21 23:18:46,945 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 [2020-07-21 23:18:47,009 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 23:18:47,009 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:18:47,012 INFO L263 TraceCheckSpWp]: Trace formula consists of 24 conjuncts, 1 conjunts are in the unsatisfiable core [2020-07-21 23:18:47,017 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:18:47,037 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:18:47,038 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:18:47,039 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1691576555] [2020-07-21 23:18:47,039 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:18:47,040 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-07-21 23:18:47,041 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [807037821] [2020-07-21 23:18:47,045 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-07-21 23:18:47,045 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:18:47,056 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-07-21 23:18:47,057 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-21 23:18:47,059 INFO L87 Difference]: Start difference. First operand 27 states. Second operand 2 states. [2020-07-21 23:18:47,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:18:47,084 INFO L93 Difference]: Finished difference Result 47 states and 62 transitions. [2020-07-21 23:18:47,084 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-07-21 23:18:47,086 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 15 [2020-07-21 23:18:47,086 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:18:47,094 INFO L225 Difference]: With dead ends: 47 [2020-07-21 23:18:47,095 INFO L226 Difference]: Without dead ends: 22 [2020-07-21 23:18:47,099 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-21 23:18:47,117 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-07-21 23:18:47,135 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-07-21 23:18:47,137 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-07-21 23:18:47,138 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 25 transitions. [2020-07-21 23:18:47,140 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 25 transitions. Word has length 15 [2020-07-21 23:18:47,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:18:47,141 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 25 transitions. [2020-07-21 23:18:47,141 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-07-21 23:18:47,141 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 25 transitions. [2020-07-21 23:18:47,142 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-07-21 23:18:47,142 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:18:47,142 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:18:47,357 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:18:47,357 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:18:47,357 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:18:47,358 INFO L82 PathProgramCache]: Analyzing trace with hash 1632722591, now seen corresponding path program 1 times [2020-07-21 23:18:47,359 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:18:47,359 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [107229865] [2020-07-21 23:18:47,360 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 [2020-07-21 23:18:47,401 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:18:47,401 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:18:47,402 INFO L263 TraceCheckSpWp]: Trace formula consists of 43 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 23:18:47,405 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:18:47,443 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 23:18:47,472 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:18:47,473 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:18:47,473 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [107229865] [2020-07-21 23:18:47,473 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:18:47,474 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 23:18:47,476 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [158450737] [2020-07-21 23:18:47,478 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 23:18:47,478 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:18:47,478 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 23:18:47,479 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 23:18:47,479 INFO L87 Difference]: Start difference. First operand 22 states and 25 transitions. Second operand 5 states. [2020-07-21 23:18:47,545 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:18:47,545 INFO L93 Difference]: Finished difference Result 31 states and 34 transitions. [2020-07-21 23:18:47,549 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 23:18:47,550 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2020-07-21 23:18:47,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:18:47,551 INFO L225 Difference]: With dead ends: 31 [2020-07-21 23:18:47,552 INFO L226 Difference]: Without dead ends: 29 [2020-07-21 23:18:47,553 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 23:18:47,554 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-07-21 23:18:47,560 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 28. [2020-07-21 23:18:47,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-07-21 23:18:47,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 31 transitions. [2020-07-21 23:18:47,562 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 31 transitions. Word has length 17 [2020-07-21 23:18:47,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:18:47,563 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 31 transitions. [2020-07-21 23:18:47,563 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 23:18:47,563 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 31 transitions. [2020-07-21 23:18:47,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-21 23:18:47,564 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:18:47,565 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:18:47,780 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:18:47,780 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:18:47,781 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:18:47,782 INFO L82 PathProgramCache]: Analyzing trace with hash -1401298672, now seen corresponding path program 1 times [2020-07-21 23:18:47,782 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:18:47,783 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1973166036] [2020-07-21 23:18:47,783 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 [2020-07-21 23:18:47,822 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 23:18:47,823 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:18:47,823 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-21 23:18:47,826 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:18:47,878 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:18:47,878 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:18:47,879 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1973166036] [2020-07-21 23:18:47,879 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:18:47,879 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 23:18:47,879 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2117253249] [2020-07-21 23:18:47,880 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 23:18:47,880 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:18:47,881 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 23:18:47,881 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-07-21 23:18:47,881 INFO L87 Difference]: Start difference. First operand 28 states and 31 transitions. Second operand 5 states. [2020-07-21 23:18:47,959 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:18:47,959 INFO L93 Difference]: Finished difference Result 49 states and 56 transitions. [2020-07-21 23:18:47,960 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 23:18:47,960 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 25 [2020-07-21 23:18:47,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:18:47,963 INFO L225 Difference]: With dead ends: 49 [2020-07-21 23:18:47,964 INFO L226 Difference]: Without dead ends: 34 [2020-07-21 23:18:47,965 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2020-07-21 23:18:47,965 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-07-21 23:18:47,975 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 30. [2020-07-21 23:18:47,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 23:18:47,976 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 33 transitions. [2020-07-21 23:18:47,976 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 33 transitions. Word has length 25 [2020-07-21 23:18:47,977 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:18:47,977 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 33 transitions. [2020-07-21 23:18:47,977 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 23:18:47,977 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 33 transitions. [2020-07-21 23:18:47,978 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 23:18:47,978 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:18:47,978 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:18:48,184 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:18:48,186 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:18:48,186 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:18:48,187 INFO L82 PathProgramCache]: Analyzing trace with hash 1107622837, now seen corresponding path program 1 times [2020-07-21 23:18:48,187 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:18:48,188 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1162072166] [2020-07-21 23:18:48,188 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 [2020-07-21 23:18:48,235 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:18:48,235 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:18:48,236 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 23:18:48,238 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:18:48,298 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:18:48,299 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:18:48,361 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:18:48,365 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1162072166] [2020-07-21 23:18:48,366 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:18:48,366 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 8 [2020-07-21 23:18:48,366 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1626025548] [2020-07-21 23:18:48,367 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-21 23:18:48,367 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:18:48,368 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-21 23:18:48,368 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-07-21 23:18:48,370 INFO L87 Difference]: Start difference. First operand 30 states and 33 transitions. Second operand 8 states. [2020-07-21 23:18:48,501 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:18:48,501 INFO L93 Difference]: Finished difference Result 55 states and 64 transitions. [2020-07-21 23:18:48,502 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 23:18:48,502 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 27 [2020-07-21 23:18:48,503 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:18:48,503 INFO L225 Difference]: With dead ends: 55 [2020-07-21 23:18:48,504 INFO L226 Difference]: Without dead ends: 40 [2020-07-21 23:18:48,505 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 45 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2020-07-21 23:18:48,505 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-07-21 23:18:48,510 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 32. [2020-07-21 23:18:48,511 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-07-21 23:18:48,512 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 35 transitions. [2020-07-21 23:18:48,512 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 35 transitions. Word has length 27 [2020-07-21 23:18:48,512 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:18:48,512 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 35 transitions. [2020-07-21 23:18:48,513 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-21 23:18:48,513 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 35 transitions. [2020-07-21 23:18:48,514 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-07-21 23:18:48,514 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:18:48,514 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:18:48,714 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:18:48,715 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:18:48,715 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:18:48,716 INFO L82 PathProgramCache]: Analyzing trace with hash -1590427366, now seen corresponding path program 2 times [2020-07-21 23:18:48,716 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:18:48,716 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [603656592] [2020-07-21 23:18:48,717 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 [2020-07-21 23:18:48,750 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:18:48,751 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:18:48,752 INFO L263 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 23:18:48,753 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:18:48,778 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 23:18:48,798 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:18:48,798 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:18:48,816 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 23:18:48,854 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:18:48,855 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [603656592] [2020-07-21 23:18:48,855 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:18:48,856 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2020-07-21 23:18:48,856 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [974613494] [2020-07-21 23:18:48,856 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-21 23:18:48,857 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:18:48,857 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-21 23:18:48,857 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-07-21 23:18:48,858 INFO L87 Difference]: Start difference. First operand 32 states and 35 transitions. Second operand 8 states. [2020-07-21 23:18:48,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:18:48,922 INFO L93 Difference]: Finished difference Result 51 states and 56 transitions. [2020-07-21 23:18:48,923 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 23:18:48,923 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 29 [2020-07-21 23:18:48,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:18:48,924 INFO L225 Difference]: With dead ends: 51 [2020-07-21 23:18:48,924 INFO L226 Difference]: Without dead ends: 49 [2020-07-21 23:18:48,925 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 47 SyntacticMatches, 4 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2020-07-21 23:18:48,926 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-07-21 23:18:48,932 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 44. [2020-07-21 23:18:48,933 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-07-21 23:18:48,934 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 48 transitions. [2020-07-21 23:18:48,934 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 48 transitions. Word has length 29 [2020-07-21 23:18:48,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:18:48,935 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 48 transitions. [2020-07-21 23:18:48,935 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-21 23:18:48,935 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 48 transitions. [2020-07-21 23:18:48,937 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-07-21 23:18:48,937 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:18:48,937 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:18:49,150 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:18:49,151 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:18:49,152 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:18:49,152 INFO L82 PathProgramCache]: Analyzing trace with hash -30298372, now seen corresponding path program 3 times [2020-07-21 23:18:49,152 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:18:49,153 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1824709271] [2020-07-21 23:18:49,154 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 [2020-07-21 23:18:49,189 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 23:18:49,189 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:18:49,190 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 23:18:49,192 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:18:49,263 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 28 proven. 6 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2020-07-21 23:18:49,263 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:18:49,331 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 22 proven. 6 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2020-07-21 23:18:49,332 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1824709271] [2020-07-21 23:18:49,332 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:18:49,332 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 11 [2020-07-21 23:18:49,333 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1433791120] [2020-07-21 23:18:49,333 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 23:18:49,333 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:18:49,334 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 23:18:49,334 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2020-07-21 23:18:49,334 INFO L87 Difference]: Start difference. First operand 44 states and 48 transitions. Second operand 11 states. [2020-07-21 23:18:49,449 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:18:49,449 INFO L93 Difference]: Finished difference Result 83 states and 96 transitions. [2020-07-21 23:18:49,450 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 23:18:49,450 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 45 [2020-07-21 23:18:49,450 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:18:49,452 INFO L225 Difference]: With dead ends: 83 [2020-07-21 23:18:49,452 INFO L226 Difference]: Without dead ends: 58 [2020-07-21 23:18:49,453 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 77 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2020-07-21 23:18:49,454 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-07-21 23:18:49,467 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 46. [2020-07-21 23:18:49,467 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-21 23:18:49,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2020-07-21 23:18:49,470 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 45 [2020-07-21 23:18:49,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:18:49,472 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2020-07-21 23:18:49,472 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 23:18:49,472 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2020-07-21 23:18:49,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-07-21 23:18:49,476 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:18:49,476 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:18:49,691 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:18:49,692 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:18:49,692 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:18:49,692 INFO L82 PathProgramCache]: Analyzing trace with hash 130155809, now seen corresponding path program 4 times [2020-07-21 23:18:49,692 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:18:49,693 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1048054231] [2020-07-21 23:18:49,693 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 [2020-07-21 23:18:49,732 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:18:49,732 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:18:49,733 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 23:18:49,736 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:18:49,822 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 24 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-21 23:18:49,822 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:18:49,912 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 24 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-21 23:18:49,913 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1048054231] [2020-07-21 23:18:49,913 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:18:49,913 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 14 [2020-07-21 23:18:49,914 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1193543807] [2020-07-21 23:18:49,914 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 23:18:49,915 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:18:49,915 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 23:18:49,915 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=129, Unknown=0, NotChecked=0, Total=182 [2020-07-21 23:18:49,916 INFO L87 Difference]: Start difference. First operand 46 states and 50 transitions. Second operand 14 states. [2020-07-21 23:18:50,098 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:18:50,099 INFO L93 Difference]: Finished difference Result 87 states and 103 transitions. [2020-07-21 23:18:50,099 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 23:18:50,099 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 47 [2020-07-21 23:18:50,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:18:50,104 INFO L225 Difference]: With dead ends: 87 [2020-07-21 23:18:50,105 INFO L226 Difference]: Without dead ends: 64 [2020-07-21 23:18:50,106 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 77 SyntacticMatches, 4 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2020-07-21 23:18:50,107 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-07-21 23:18:50,112 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 48. [2020-07-21 23:18:50,113 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-07-21 23:18:50,114 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 52 transitions. [2020-07-21 23:18:50,114 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 52 transitions. Word has length 47 [2020-07-21 23:18:50,114 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:18:50,114 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 52 transitions. [2020-07-21 23:18:50,114 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 23:18:50,115 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 52 transitions. [2020-07-21 23:18:50,115 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-07-21 23:18:50,116 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:18:50,116 INFO L422 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:18:50,329 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:18:50,330 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:18:50,331 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:18:50,331 INFO L82 PathProgramCache]: Analyzing trace with hash -292198906, now seen corresponding path program 5 times [2020-07-21 23:18:50,331 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:18:50,332 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1453518408] [2020-07-21 23:18:50,332 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 [2020-07-21 23:18:50,371 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:18:50,371 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:18:50,372 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 23:18:50,374 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:18:50,427 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 23:18:50,444 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 26 proven. 18 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-21 23:18:50,444 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:18:50,463 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 23:18:50,521 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 26 proven. 18 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-21 23:18:50,521 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1453518408] [2020-07-21 23:18:50,521 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:18:50,522 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 10 [2020-07-21 23:18:50,522 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1738689795] [2020-07-21 23:18:50,524 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 23:18:50,524 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:18:50,524 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 23:18:50,525 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=58, Unknown=0, NotChecked=0, Total=90 [2020-07-21 23:18:50,526 INFO L87 Difference]: Start difference. First operand 48 states and 52 transitions. Second operand 10 states. [2020-07-21 23:18:50,614 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:18:50,615 INFO L93 Difference]: Finished difference Result 67 states and 73 transitions. [2020-07-21 23:18:50,615 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 23:18:50,616 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 49 [2020-07-21 23:18:50,617 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:18:50,618 INFO L225 Difference]: With dead ends: 67 [2020-07-21 23:18:50,618 INFO L226 Difference]: Without dead ends: 65 [2020-07-21 23:18:50,618 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 81 SyntacticMatches, 8 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-21 23:18:50,619 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2020-07-21 23:18:50,628 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 60. [2020-07-21 23:18:50,628 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-07-21 23:18:50,631 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 65 transitions. [2020-07-21 23:18:50,631 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 65 transitions. Word has length 49 [2020-07-21 23:18:50,632 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:18:50,632 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 65 transitions. [2020-07-21 23:18:50,632 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 23:18:50,633 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 65 transitions. [2020-07-21 23:18:50,633 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-07-21 23:18:50,634 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:18:50,634 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 5, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:18:50,836 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:18:50,837 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:18:50,838 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:18:50,838 INFO L82 PathProgramCache]: Analyzing trace with hash 551795688, now seen corresponding path program 6 times [2020-07-21 23:18:50,838 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:18:50,840 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1198754082] [2020-07-21 23:18:50,840 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 [2020-07-21 23:18:50,891 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:18:50,891 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:18:50,892 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 23:18:50,895 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:18:51,007 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 72 proven. 20 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2020-07-21 23:18:51,007 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:18:51,123 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 58 proven. 20 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2020-07-21 23:18:51,124 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1198754082] [2020-07-21 23:18:51,124 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:18:51,124 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 17 [2020-07-21 23:18:51,124 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [892871738] [2020-07-21 23:18:51,125 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 23:18:51,125 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:18:51,126 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 23:18:51,126 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=196, Unknown=0, NotChecked=0, Total=272 [2020-07-21 23:18:51,126 INFO L87 Difference]: Start difference. First operand 60 states and 65 transitions. Second operand 17 states. [2020-07-21 23:18:51,339 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:18:51,339 INFO L93 Difference]: Finished difference Result 115 states and 135 transitions. [2020-07-21 23:18:51,339 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 23:18:51,340 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 65 [2020-07-21 23:18:51,341 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:18:51,344 INFO L225 Difference]: With dead ends: 115 [2020-07-21 23:18:51,345 INFO L226 Difference]: Without dead ends: 82 [2020-07-21 23:18:51,346 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 109 SyntacticMatches, 5 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 86 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=141, Invalid=321, Unknown=0, NotChecked=0, Total=462 [2020-07-21 23:18:51,349 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-07-21 23:18:51,360 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 62. [2020-07-21 23:18:51,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2020-07-21 23:18:51,362 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 67 transitions. [2020-07-21 23:18:51,362 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 67 transitions. Word has length 65 [2020-07-21 23:18:51,363 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:18:51,363 INFO L479 AbstractCegarLoop]: Abstraction has 62 states and 67 transitions. [2020-07-21 23:18:51,363 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 23:18:51,363 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 67 transitions. [2020-07-21 23:18:51,368 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-07-21 23:18:51,368 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:18:51,368 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:18:51,568 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:18:51,569 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:18:51,569 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:18:51,570 INFO L82 PathProgramCache]: Analyzing trace with hash -150434419, now seen corresponding path program 7 times [2020-07-21 23:18:51,570 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:18:51,570 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2047129494] [2020-07-21 23:18:51,571 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 [2020-07-21 23:18:51,614 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:18:51,615 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:18:51,616 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 23:18:51,619 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:18:51,761 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 60 proven. 30 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-21 23:18:51,762 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:18:51,895 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 60 proven. 30 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-21 23:18:51,896 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2047129494] [2020-07-21 23:18:51,896 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:18:51,896 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 20 [2020-07-21 23:18:51,897 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1943493974] [2020-07-21 23:18:51,897 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 23:18:51,897 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:18:51,898 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 23:18:51,898 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=277, Unknown=0, NotChecked=0, Total=380 [2020-07-21 23:18:51,898 INFO L87 Difference]: Start difference. First operand 62 states and 67 transitions. Second operand 20 states. [2020-07-21 23:18:52,183 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:18:52,184 INFO L93 Difference]: Finished difference Result 119 states and 142 transitions. [2020-07-21 23:18:52,184 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 23:18:52,184 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 67 [2020-07-21 23:18:52,185 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:18:52,186 INFO L225 Difference]: With dead ends: 119 [2020-07-21 23:18:52,186 INFO L226 Difference]: Without dead ends: 88 [2020-07-21 23:18:52,190 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 109 SyntacticMatches, 6 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 130 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=193, Invalid=457, Unknown=0, NotChecked=0, Total=650 [2020-07-21 23:18:52,191 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-07-21 23:18:52,209 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 64. [2020-07-21 23:18:52,209 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-07-21 23:18:52,213 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 69 transitions. [2020-07-21 23:18:52,213 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 69 transitions. Word has length 67 [2020-07-21 23:18:52,213 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:18:52,213 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 69 transitions. [2020-07-21 23:18:52,214 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 23:18:52,214 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 69 transitions. [2020-07-21 23:18:52,215 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-07-21 23:18:52,219 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:18:52,219 INFO L422 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:18:52,432 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:18:52,433 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:18:52,433 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:18:52,433 INFO L82 PathProgramCache]: Analyzing trace with hash -683701774, now seen corresponding path program 8 times [2020-07-21 23:18:52,434 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:18:52,434 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1163802745] [2020-07-21 23:18:52,434 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 [2020-07-21 23:18:52,482 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:18:52,482 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:18:52,483 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-21 23:18:52,489 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:18:52,551 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 23:18:52,569 INFO L134 CoverageAnalysis]: Checked inductivity of 142 backedges. 52 proven. 50 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-21 23:18:52,569 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:18:52,582 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 23:18:52,682 INFO L134 CoverageAnalysis]: Checked inductivity of 142 backedges. 52 proven. 50 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-21 23:18:52,682 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1163802745] [2020-07-21 23:18:52,683 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:18:52,683 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2020-07-21 23:18:52,683 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [842497400] [2020-07-21 23:18:52,684 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 23:18:52,684 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:18:52,684 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 23:18:52,684 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=83, Unknown=0, NotChecked=0, Total=132 [2020-07-21 23:18:52,684 INFO L87 Difference]: Start difference. First operand 64 states and 69 transitions. Second operand 12 states. [2020-07-21 23:18:52,790 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:18:52,790 INFO L93 Difference]: Finished difference Result 83 states and 90 transitions. [2020-07-21 23:18:52,791 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 23:18:52,791 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 69 [2020-07-21 23:18:52,792 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:18:52,792 INFO L225 Difference]: With dead ends: 83 [2020-07-21 23:18:52,793 INFO L226 Difference]: Without dead ends: 81 [2020-07-21 23:18:52,793 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 115 SyntacticMatches, 12 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=53, Invalid=103, Unknown=0, NotChecked=0, Total=156 [2020-07-21 23:18:52,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2020-07-21 23:18:52,801 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 76. [2020-07-21 23:18:52,801 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-21 23:18:52,802 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 82 transitions. [2020-07-21 23:18:52,803 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 82 transitions. Word has length 69 [2020-07-21 23:18:52,803 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:18:52,803 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 82 transitions. [2020-07-21 23:18:52,803 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 23:18:52,803 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 82 transitions. [2020-07-21 23:18:52,805 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2020-07-21 23:18:52,805 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:18:52,805 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 8, 7, 7, 7, 7, 7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:18:53,005 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:18:53,006 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:18:53,006 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:18:53,006 INFO L82 PathProgramCache]: Analyzing trace with hash 192972756, now seen corresponding path program 9 times [2020-07-21 23:18:53,006 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:18:53,007 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [902072982] [2020-07-21 23:18:53,007 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 [2020-07-21 23:18:53,053 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:18:53,054 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:18:53,055 INFO L263 TraceCheckSpWp]: Trace formula consists of 222 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 23:18:53,057 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:18:53,220 INFO L134 CoverageAnalysis]: Checked inductivity of 238 backedges. 132 proven. 42 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2020-07-21 23:18:53,220 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:18:53,403 INFO L134 CoverageAnalysis]: Checked inductivity of 238 backedges. 110 proven. 42 refuted. 0 times theorem prover too weak. 86 trivial. 0 not checked. [2020-07-21 23:18:53,404 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [902072982] [2020-07-21 23:18:53,404 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:18:53,404 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 23 [2020-07-21 23:18:53,404 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1012212567] [2020-07-21 23:18:53,406 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 23:18:53,406 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:18:53,406 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 23:18:53,407 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-21 23:18:53,408 INFO L87 Difference]: Start difference. First operand 76 states and 82 transitions. Second operand 23 states. [2020-07-21 23:18:53,722 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:18:53,722 INFO L93 Difference]: Finished difference Result 147 states and 174 transitions. [2020-07-21 23:18:53,723 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 23:18:53,723 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 85 [2020-07-21 23:18:53,723 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:18:53,725 INFO L225 Difference]: With dead ends: 147 [2020-07-21 23:18:53,725 INFO L226 Difference]: Without dead ends: 106 [2020-07-21 23:18:53,729 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 141 SyntacticMatches, 7 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 183 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=253, Invalid=617, Unknown=0, NotChecked=0, Total=870 [2020-07-21 23:18:53,729 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-07-21 23:18:53,743 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 78. [2020-07-21 23:18:53,743 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2020-07-21 23:18:53,746 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 84 transitions. [2020-07-21 23:18:53,746 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 84 transitions. Word has length 85 [2020-07-21 23:18:53,747 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:18:53,747 INFO L479 AbstractCegarLoop]: Abstraction has 78 states and 84 transitions. [2020-07-21 23:18:53,747 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 23:18:53,747 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 84 transitions. [2020-07-21 23:18:53,756 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2020-07-21 23:18:53,756 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:18:53,757 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:18:53,960 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:18:53,961 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:18:53,961 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:18:53,961 INFO L82 PathProgramCache]: Analyzing trace with hash 1722356985, now seen corresponding path program 10 times [2020-07-21 23:18:53,962 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:18:53,962 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1673112719] [2020-07-21 23:18:53,962 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 [2020-07-21 23:18:54,028 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:18:54,029 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:18:54,030 INFO L263 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 23:18:54,035 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:18:54,233 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 112 proven. 56 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2020-07-21 23:18:54,233 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:18:54,442 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 112 proven. 56 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2020-07-21 23:18:54,443 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1673112719] [2020-07-21 23:18:54,443 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:18:54,443 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 26 [2020-07-21 23:18:54,444 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [629043033] [2020-07-21 23:18:54,444 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-07-21 23:18:54,444 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:18:54,445 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-07-21 23:18:54,445 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=169, Invalid=481, Unknown=0, NotChecked=0, Total=650 [2020-07-21 23:18:54,445 INFO L87 Difference]: Start difference. First operand 78 states and 84 transitions. Second operand 26 states. [2020-07-21 23:18:54,793 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:18:54,793 INFO L93 Difference]: Finished difference Result 151 states and 181 transitions. [2020-07-21 23:18:54,793 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-21 23:18:54,794 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 87 [2020-07-21 23:18:54,794 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:18:54,795 INFO L225 Difference]: With dead ends: 151 [2020-07-21 23:18:54,795 INFO L226 Difference]: Without dead ends: 112 [2020-07-21 23:18:54,796 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 181 GetRequests, 141 SyntacticMatches, 8 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 245 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=321, Invalid=801, Unknown=0, NotChecked=0, Total=1122 [2020-07-21 23:18:54,797 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2020-07-21 23:18:54,809 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 80. [2020-07-21 23:18:54,809 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2020-07-21 23:18:54,810 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 86 transitions. [2020-07-21 23:18:54,811 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 86 transitions. Word has length 87 [2020-07-21 23:18:54,811 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:18:54,811 INFO L479 AbstractCegarLoop]: Abstraction has 80 states and 86 transitions. [2020-07-21 23:18:54,811 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-07-21 23:18:54,811 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 86 transitions. [2020-07-21 23:18:54,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2020-07-21 23:18:54,812 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:18:54,812 INFO L422 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 8, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:18:55,027 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:18:55,028 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:18:55,028 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:18:55,029 INFO L82 PathProgramCache]: Analyzing trace with hash -1713181474, now seen corresponding path program 11 times [2020-07-21 23:18:55,029 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:18:55,029 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1814979657] [2020-07-21 23:18:55,030 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 [2020-07-21 23:18:55,090 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:18:55,091 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:18:55,092 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-21 23:18:55,095 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:18:55,162 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 23:18:55,183 INFO L134 CoverageAnalysis]: Checked inductivity of 268 backedges. 86 proven. 98 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2020-07-21 23:18:55,184 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:18:55,198 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 23:18:55,338 INFO L134 CoverageAnalysis]: Checked inductivity of 268 backedges. 86 proven. 98 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2020-07-21 23:18:55,338 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1814979657] [2020-07-21 23:18:55,338 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:18:55,339 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 14 [2020-07-21 23:18:55,339 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [76944322] [2020-07-21 23:18:55,341 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 23:18:55,342 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:18:55,342 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 23:18:55,342 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=112, Unknown=0, NotChecked=0, Total=182 [2020-07-21 23:18:55,342 INFO L87 Difference]: Start difference. First operand 80 states and 86 transitions. Second operand 14 states. [2020-07-21 23:18:55,469 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:18:55,469 INFO L93 Difference]: Finished difference Result 99 states and 107 transitions. [2020-07-21 23:18:55,469 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 23:18:55,470 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 89 [2020-07-21 23:18:55,470 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:18:55,471 INFO L225 Difference]: With dead ends: 99 [2020-07-21 23:18:55,471 INFO L226 Difference]: Without dead ends: 97 [2020-07-21 23:18:55,472 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 149 SyntacticMatches, 16 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 119 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=74, Invalid=136, Unknown=0, NotChecked=0, Total=210 [2020-07-21 23:18:55,474 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2020-07-21 23:18:55,484 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 92. [2020-07-21 23:18:55,484 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2020-07-21 23:18:55,485 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 99 transitions. [2020-07-21 23:18:55,485 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 99 transitions. Word has length 89 [2020-07-21 23:18:55,486 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:18:55,486 INFO L479 AbstractCegarLoop]: Abstraction has 92 states and 99 transitions. [2020-07-21 23:18:55,486 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 23:18:55,487 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 99 transitions. [2020-07-21 23:18:55,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2020-07-21 23:18:55,488 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:18:55,488 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 10, 9, 9, 9, 9, 9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:18:55,695 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:18:55,696 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:18:55,696 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:18:55,697 INFO L82 PathProgramCache]: Analyzing trace with hash -1950838080, now seen corresponding path program 12 times [2020-07-21 23:18:55,697 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:18:55,697 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1687965169] [2020-07-21 23:18:55,698 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 [2020-07-21 23:18:55,753 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:18:55,753 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:18:55,754 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 23:18:55,756 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:18:55,970 INFO L134 CoverageAnalysis]: Checked inductivity of 396 backedges. 208 proven. 72 refuted. 0 times theorem prover too weak. 116 trivial. 0 not checked. [2020-07-21 23:18:55,970 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:18:56,255 INFO L134 CoverageAnalysis]: Checked inductivity of 396 backedges. 178 proven. 72 refuted. 0 times theorem prover too weak. 146 trivial. 0 not checked. [2020-07-21 23:18:56,255 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1687965169] [2020-07-21 23:18:56,256 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:18:56,256 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 29 [2020-07-21 23:18:56,256 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [578285436] [2020-07-21 23:18:56,257 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 23:18:56,257 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:18:56,257 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 23:18:56,258 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=208, Invalid=604, Unknown=0, NotChecked=0, Total=812 [2020-07-21 23:18:56,258 INFO L87 Difference]: Start difference. First operand 92 states and 99 transitions. Second operand 29 states. [2020-07-21 23:18:56,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:18:56,680 INFO L93 Difference]: Finished difference Result 179 states and 213 transitions. [2020-07-21 23:18:56,680 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-07-21 23:18:56,680 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 105 [2020-07-21 23:18:56,681 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:18:56,682 INFO L225 Difference]: With dead ends: 179 [2020-07-21 23:18:56,682 INFO L226 Difference]: Without dead ends: 130 [2020-07-21 23:18:56,683 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 173 SyntacticMatches, 9 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 316 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=397, Invalid=1009, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 23:18:56,684 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2020-07-21 23:18:56,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 94. [2020-07-21 23:18:56,690 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2020-07-21 23:18:56,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 101 transitions. [2020-07-21 23:18:56,691 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 101 transitions. Word has length 105 [2020-07-21 23:18:56,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:18:56,691 INFO L479 AbstractCegarLoop]: Abstraction has 94 states and 101 transitions. [2020-07-21 23:18:56,691 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 23:18:56,691 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 101 transitions. [2020-07-21 23:18:56,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2020-07-21 23:18:56,692 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:18:56,693 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:18:56,897 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:18:56,898 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:18:56,898 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:18:56,899 INFO L82 PathProgramCache]: Analyzing trace with hash -734782619, now seen corresponding path program 13 times [2020-07-21 23:18:56,899 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:18:56,899 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [918877375] [2020-07-21 23:18:56,900 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 [2020-07-21 23:18:56,955 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:18:56,955 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:18:56,956 INFO L263 TraceCheckSpWp]: Trace formula consists of 286 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 23:18:56,960 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:18:57,187 INFO L134 CoverageAnalysis]: Checked inductivity of 414 backedges. 180 proven. 90 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2020-07-21 23:18:57,187 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:18:57,467 INFO L134 CoverageAnalysis]: Checked inductivity of 414 backedges. 180 proven. 90 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2020-07-21 23:18:57,468 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [918877375] [2020-07-21 23:18:57,468 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:18:57,468 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 32 [2020-07-21 23:18:57,468 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2117590853] [2020-07-21 23:18:57,469 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-07-21 23:18:57,469 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:18:57,470 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-07-21 23:18:57,470 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=251, Invalid=741, Unknown=0, NotChecked=0, Total=992 [2020-07-21 23:18:57,470 INFO L87 Difference]: Start difference. First operand 94 states and 101 transitions. Second operand 32 states. [2020-07-21 23:18:57,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:18:57,928 INFO L93 Difference]: Finished difference Result 183 states and 220 transitions. [2020-07-21 23:18:57,928 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-07-21 23:18:57,928 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 107 [2020-07-21 23:18:57,928 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:18:57,929 INFO L225 Difference]: With dead ends: 183 [2020-07-21 23:18:57,929 INFO L226 Difference]: Without dead ends: 136 [2020-07-21 23:18:57,931 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 223 GetRequests, 173 SyntacticMatches, 10 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 396 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=481, Invalid=1241, Unknown=0, NotChecked=0, Total=1722 [2020-07-21 23:18:57,931 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2020-07-21 23:18:57,937 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 96. [2020-07-21 23:18:57,937 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2020-07-21 23:18:57,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 103 transitions. [2020-07-21 23:18:57,938 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 103 transitions. Word has length 107 [2020-07-21 23:18:57,938 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:18:57,938 INFO L479 AbstractCegarLoop]: Abstraction has 96 states and 103 transitions. [2020-07-21 23:18:57,938 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-07-21 23:18:57,939 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 103 transitions. [2020-07-21 23:18:57,940 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-07-21 23:18:57,940 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:18:57,940 INFO L422 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 10, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:18:58,153 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:18:58,154 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:18:58,154 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:18:58,155 INFO L82 PathProgramCache]: Analyzing trace with hash -336589110, now seen corresponding path program 14 times [2020-07-21 23:18:58,155 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:18:58,155 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [764121789] [2020-07-21 23:18:58,156 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 [2020-07-21 23:18:58,215 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:18:58,215 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:18:58,217 INFO L263 TraceCheckSpWp]: Trace formula consists of 296 conjuncts, 23 conjunts are in the unsatisfiable core [2020-07-21 23:18:58,219 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:18:58,309 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 23:18:58,335 INFO L134 CoverageAnalysis]: Checked inductivity of 434 backedges. 128 proven. 162 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2020-07-21 23:18:58,335 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:18:58,352 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 23:18:58,544 INFO L134 CoverageAnalysis]: Checked inductivity of 434 backedges. 128 proven. 162 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2020-07-21 23:18:58,544 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [764121789] [2020-07-21 23:18:58,545 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:18:58,545 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 16 [2020-07-21 23:18:58,545 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [609643428] [2020-07-21 23:18:58,546 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 23:18:58,546 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:18:58,546 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 23:18:58,546 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=145, Unknown=0, NotChecked=0, Total=240 [2020-07-21 23:18:58,546 INFO L87 Difference]: Start difference. First operand 96 states and 103 transitions. Second operand 16 states. [2020-07-21 23:18:58,684 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:18:58,684 INFO L93 Difference]: Finished difference Result 115 states and 124 transitions. [2020-07-21 23:18:58,684 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 23:18:58,685 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 109 [2020-07-21 23:18:58,685 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:18:58,687 INFO L225 Difference]: With dead ends: 115 [2020-07-21 23:18:58,687 INFO L226 Difference]: Without dead ends: 113 [2020-07-21 23:18:58,688 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 183 SyntacticMatches, 20 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 169 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=99, Invalid=173, Unknown=0, NotChecked=0, Total=272 [2020-07-21 23:18:58,688 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2020-07-21 23:18:58,694 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 108. [2020-07-21 23:18:58,695 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 108 states. [2020-07-21 23:18:58,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 116 transitions. [2020-07-21 23:18:58,696 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 116 transitions. Word has length 109 [2020-07-21 23:18:58,696 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:18:58,697 INFO L479 AbstractCegarLoop]: Abstraction has 108 states and 116 transitions. [2020-07-21 23:18:58,697 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 23:18:58,697 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 116 transitions. [2020-07-21 23:18:58,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2020-07-21 23:18:58,699 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:18:58,699 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 12, 11, 11, 11, 11, 11, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:18:58,908 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:18:58,909 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:18:58,909 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:18:58,910 INFO L82 PathProgramCache]: Analyzing trace with hash 1711037612, now seen corresponding path program 15 times [2020-07-21 23:18:58,910 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:18:58,910 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1773117713] [2020-07-21 23:18:58,911 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 [2020-07-21 23:18:58,969 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:18:58,969 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:18:58,971 INFO L263 TraceCheckSpWp]: Trace formula consists of 330 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 23:18:58,974 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:18:59,280 INFO L134 CoverageAnalysis]: Checked inductivity of 594 backedges. 300 proven. 110 refuted. 0 times theorem prover too weak. 184 trivial. 0 not checked. [2020-07-21 23:18:59,280 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:18:59,647 INFO L134 CoverageAnalysis]: Checked inductivity of 594 backedges. 262 proven. 110 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2020-07-21 23:18:59,647 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1773117713] [2020-07-21 23:18:59,647 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:18:59,647 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24] total 35 [2020-07-21 23:18:59,648 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2140792169] [2020-07-21 23:18:59,648 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-07-21 23:18:59,648 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:18:59,649 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-07-21 23:18:59,649 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=298, Invalid=892, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 23:18:59,650 INFO L87 Difference]: Start difference. First operand 108 states and 116 transitions. Second operand 35 states. [2020-07-21 23:19:00,162 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:19:00,162 INFO L93 Difference]: Finished difference Result 211 states and 252 transitions. [2020-07-21 23:19:00,162 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-07-21 23:19:00,163 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 125 [2020-07-21 23:19:00,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:19:00,164 INFO L225 Difference]: With dead ends: 211 [2020-07-21 23:19:00,164 INFO L226 Difference]: Without dead ends: 154 [2020-07-21 23:19:00,166 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 260 GetRequests, 205 SyntacticMatches, 11 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 485 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=573, Invalid=1497, Unknown=0, NotChecked=0, Total=2070 [2020-07-21 23:19:00,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2020-07-21 23:19:00,172 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 110. [2020-07-21 23:19:00,173 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 110 states. [2020-07-21 23:19:00,173 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 118 transitions. [2020-07-21 23:19:00,174 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 118 transitions. Word has length 125 [2020-07-21 23:19:00,174 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:19:00,174 INFO L479 AbstractCegarLoop]: Abstraction has 110 states and 118 transitions. [2020-07-21 23:19:00,174 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-07-21 23:19:00,174 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 118 transitions. [2020-07-21 23:19:00,176 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2020-07-21 23:19:00,176 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:19:00,176 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:19:00,390 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:19:00,391 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:19:00,391 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:19:00,392 INFO L82 PathProgramCache]: Analyzing trace with hash 66724049, now seen corresponding path program 16 times [2020-07-21 23:19:00,392 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:19:00,392 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1929358418] [2020-07-21 23:19:00,392 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 [2020-07-21 23:19:00,459 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:19:00,459 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:19:00,461 INFO L263 TraceCheckSpWp]: Trace formula consists of 340 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-21 23:19:00,463 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:19:00,810 INFO L134 CoverageAnalysis]: Checked inductivity of 616 backedges. 264 proven. 132 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2020-07-21 23:19:00,810 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:19:01,237 INFO L134 CoverageAnalysis]: Checked inductivity of 616 backedges. 264 proven. 132 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2020-07-21 23:19:01,237 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1929358418] [2020-07-21 23:19:01,237 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:19:01,238 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26] total 38 [2020-07-21 23:19:01,238 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [783841916] [2020-07-21 23:19:01,238 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-07-21 23:19:01,239 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:19:01,239 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-07-21 23:19:01,239 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=349, Invalid=1057, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 23:19:01,240 INFO L87 Difference]: Start difference. First operand 110 states and 118 transitions. Second operand 38 states. [2020-07-21 23:19:01,772 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:19:01,772 INFO L93 Difference]: Finished difference Result 215 states and 259 transitions. [2020-07-21 23:19:01,773 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-07-21 23:19:01,773 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 127 [2020-07-21 23:19:01,773 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:19:01,774 INFO L225 Difference]: With dead ends: 215 [2020-07-21 23:19:01,774 INFO L226 Difference]: Without dead ends: 160 [2020-07-21 23:19:01,776 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 265 GetRequests, 205 SyntacticMatches, 12 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 583 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=673, Invalid=1777, Unknown=0, NotChecked=0, Total=2450 [2020-07-21 23:19:01,776 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2020-07-21 23:19:01,782 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 112. [2020-07-21 23:19:01,783 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2020-07-21 23:19:01,783 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 120 transitions. [2020-07-21 23:19:01,784 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 120 transitions. Word has length 127 [2020-07-21 23:19:01,784 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:19:01,784 INFO L479 AbstractCegarLoop]: Abstraction has 112 states and 120 transitions. [2020-07-21 23:19:01,784 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-07-21 23:19:01,784 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 120 transitions. [2020-07-21 23:19:01,785 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2020-07-21 23:19:01,786 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:19:01,786 INFO L422 BasicCegarLoop]: trace histogram [13, 12, 12, 12, 12, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:19:01,986 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:19:01,987 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:19:01,987 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:19:01,987 INFO L82 PathProgramCache]: Analyzing trace with hash 429354934, now seen corresponding path program 17 times [2020-07-21 23:19:01,988 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:19:01,988 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [830805741] [2020-07-21 23:19:01,988 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 [2020-07-21 23:19:02,048 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:19:02,048 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:19:02,049 INFO L263 TraceCheckSpWp]: Trace formula consists of 350 conjuncts, 27 conjunts are in the unsatisfiable core [2020-07-21 23:19:02,051 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:19:02,172 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 23:19:02,201 INFO L134 CoverageAnalysis]: Checked inductivity of 640 backedges. 178 proven. 242 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2020-07-21 23:19:02,201 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:19:02,219 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 23:19:02,483 INFO L134 CoverageAnalysis]: Checked inductivity of 640 backedges. 178 proven. 242 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2020-07-21 23:19:02,484 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [830805741] [2020-07-21 23:19:02,484 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:19:02,484 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 18 [2020-07-21 23:19:02,484 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1727731278] [2020-07-21 23:19:02,486 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 23:19:02,486 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:19:02,486 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 23:19:02,487 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=182, Unknown=0, NotChecked=0, Total=306 [2020-07-21 23:19:02,487 INFO L87 Difference]: Start difference. First operand 112 states and 120 transitions. Second operand 18 states. [2020-07-21 23:19:02,670 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:19:02,670 INFO L93 Difference]: Finished difference Result 131 states and 141 transitions. [2020-07-21 23:19:02,672 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-21 23:19:02,673 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 129 [2020-07-21 23:19:02,673 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:19:02,675 INFO L225 Difference]: With dead ends: 131 [2020-07-21 23:19:02,676 INFO L226 Difference]: Without dead ends: 129 [2020-07-21 23:19:02,676 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 258 GetRequests, 217 SyntacticMatches, 24 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 227 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=128, Invalid=214, Unknown=0, NotChecked=0, Total=342 [2020-07-21 23:19:02,677 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2020-07-21 23:19:02,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 124. [2020-07-21 23:19:02,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 124 states. [2020-07-21 23:19:02,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 133 transitions. [2020-07-21 23:19:02,691 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 133 transitions. Word has length 129 [2020-07-21 23:19:02,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:19:02,692 INFO L479 AbstractCegarLoop]: Abstraction has 124 states and 133 transitions. [2020-07-21 23:19:02,692 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 23:19:02,692 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 133 transitions. [2020-07-21 23:19:02,695 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2020-07-21 23:19:02,695 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:19:02,695 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 14, 13, 13, 13, 13, 13, 13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:19:02,909 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:19:02,910 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:19:02,910 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:19:02,910 INFO L82 PathProgramCache]: Analyzing trace with hash 1971086744, now seen corresponding path program 18 times [2020-07-21 23:19:02,910 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:19:02,911 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [927250106] [2020-07-21 23:19:02,911 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 [2020-07-21 23:19:02,985 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:19:02,985 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:19:02,987 INFO L263 TraceCheckSpWp]: Trace formula consists of 384 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-21 23:19:02,990 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:19:03,395 INFO L134 CoverageAnalysis]: Checked inductivity of 832 backedges. 408 proven. 156 refuted. 0 times theorem prover too weak. 268 trivial. 0 not checked. [2020-07-21 23:19:03,396 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:19:03,889 INFO L134 CoverageAnalysis]: Checked inductivity of 832 backedges. 362 proven. 156 refuted. 0 times theorem prover too weak. 314 trivial. 0 not checked. [2020-07-21 23:19:03,890 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [927250106] [2020-07-21 23:19:03,890 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:19:03,890 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28] total 41 [2020-07-21 23:19:03,890 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [910422096] [2020-07-21 23:19:03,891 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-07-21 23:19:03,891 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:19:03,891 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-07-21 23:19:03,892 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=404, Invalid=1236, Unknown=0, NotChecked=0, Total=1640 [2020-07-21 23:19:03,892 INFO L87 Difference]: Start difference. First operand 124 states and 133 transitions. Second operand 41 states. [2020-07-21 23:19:04,464 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:19:04,464 INFO L93 Difference]: Finished difference Result 243 states and 291 transitions. [2020-07-21 23:19:04,465 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-07-21 23:19:04,465 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 145 [2020-07-21 23:19:04,465 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:19:04,467 INFO L225 Difference]: With dead ends: 243 [2020-07-21 23:19:04,467 INFO L226 Difference]: Without dead ends: 178 [2020-07-21 23:19:04,468 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 302 GetRequests, 237 SyntacticMatches, 13 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 690 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=781, Invalid=2081, Unknown=0, NotChecked=0, Total=2862 [2020-07-21 23:19:04,469 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2020-07-21 23:19:04,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 126. [2020-07-21 23:19:04,475 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 126 states. [2020-07-21 23:19:04,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 135 transitions. [2020-07-21 23:19:04,476 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 135 transitions. Word has length 145 [2020-07-21 23:19:04,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:19:04,476 INFO L479 AbstractCegarLoop]: Abstraction has 126 states and 135 transitions. [2020-07-21 23:19:04,477 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-07-21 23:19:04,477 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 135 transitions. [2020-07-21 23:19:04,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2020-07-21 23:19:04,478 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:19:04,478 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 14, 14, 13, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:19:04,691 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:19:04,692 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:19:04,692 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:19:04,693 INFO L82 PathProgramCache]: Analyzing trace with hash 554411325, now seen corresponding path program 19 times [2020-07-21 23:19:04,693 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:19:04,693 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1209523197] [2020-07-21 23:19:04,693 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 [2020-07-21 23:19:04,760 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:19:04,760 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:19:04,762 INFO L263 TraceCheckSpWp]: Trace formula consists of 394 conjuncts, 30 conjunts are in the unsatisfiable core [2020-07-21 23:19:04,764 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:19:05,199 INFO L134 CoverageAnalysis]: Checked inductivity of 858 backedges. 364 proven. 182 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2020-07-21 23:19:05,199 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:19:05,722 INFO L134 CoverageAnalysis]: Checked inductivity of 858 backedges. 364 proven. 182 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2020-07-21 23:19:05,722 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1209523197] [2020-07-21 23:19:05,723 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:19:05,723 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30] total 44 [2020-07-21 23:19:05,723 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1128796621] [2020-07-21 23:19:05,724 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-07-21 23:19:05,724 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:19:05,724 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-07-21 23:19:05,725 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=463, Invalid=1429, Unknown=0, NotChecked=0, Total=1892 [2020-07-21 23:19:05,725 INFO L87 Difference]: Start difference. First operand 126 states and 135 transitions. Second operand 44 states. [2020-07-21 23:19:06,430 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:19:06,430 INFO L93 Difference]: Finished difference Result 247 states and 298 transitions. [2020-07-21 23:19:06,431 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-07-21 23:19:06,431 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 147 [2020-07-21 23:19:06,431 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:19:06,432 INFO L225 Difference]: With dead ends: 247 [2020-07-21 23:19:06,433 INFO L226 Difference]: Without dead ends: 184 [2020-07-21 23:19:06,436 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 307 GetRequests, 237 SyntacticMatches, 14 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 806 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=897, Invalid=2409, Unknown=0, NotChecked=0, Total=3306 [2020-07-21 23:19:06,437 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2020-07-21 23:19:06,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 128. [2020-07-21 23:19:06,449 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 128 states. [2020-07-21 23:19:06,450 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 137 transitions. [2020-07-21 23:19:06,451 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 137 transitions. Word has length 147 [2020-07-21 23:19:06,451 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:19:06,451 INFO L479 AbstractCegarLoop]: Abstraction has 128 states and 137 transitions. [2020-07-21 23:19:06,451 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-07-21 23:19:06,451 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 137 transitions. [2020-07-21 23:19:06,453 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2020-07-21 23:19:06,453 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:19:06,454 INFO L422 BasicCegarLoop]: trace histogram [15, 14, 14, 14, 14, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:19:06,666 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:19:06,667 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:19:06,667 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:19:06,667 INFO L82 PathProgramCache]: Analyzing trace with hash 633966498, now seen corresponding path program 20 times [2020-07-21 23:19:06,668 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:19:06,668 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2104208955] [2020-07-21 23:19:06,668 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 [2020-07-21 23:19:06,740 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:19:06,741 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:19:06,742 INFO L263 TraceCheckSpWp]: Trace formula consists of 404 conjuncts, 31 conjunts are in the unsatisfiable core [2020-07-21 23:19:06,744 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:19:06,904 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 23:19:06,939 INFO L134 CoverageAnalysis]: Checked inductivity of 886 backedges. 236 proven. 338 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2020-07-21 23:19:06,939 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:19:06,964 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 23:19:07,248 INFO L134 CoverageAnalysis]: Checked inductivity of 886 backedges. 236 proven. 338 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2020-07-21 23:19:07,249 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2104208955] [2020-07-21 23:19:07,249 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:19:07,249 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 20 [2020-07-21 23:19:07,249 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [617995325] [2020-07-21 23:19:07,249 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 23:19:07,250 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:19:07,250 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 23:19:07,250 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=157, Invalid=223, Unknown=0, NotChecked=0, Total=380 [2020-07-21 23:19:07,250 INFO L87 Difference]: Start difference. First operand 128 states and 137 transitions. Second operand 20 states. [2020-07-21 23:19:07,449 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:19:07,449 INFO L93 Difference]: Finished difference Result 147 states and 158 transitions. [2020-07-21 23:19:07,450 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-07-21 23:19:07,450 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 149 [2020-07-21 23:19:07,450 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:19:07,452 INFO L225 Difference]: With dead ends: 147 [2020-07-21 23:19:07,452 INFO L226 Difference]: Without dead ends: 145 [2020-07-21 23:19:07,453 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 298 GetRequests, 251 SyntacticMatches, 28 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 293 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=161, Invalid=259, Unknown=0, NotChecked=0, Total=420 [2020-07-21 23:19:07,453 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145 states. [2020-07-21 23:19:07,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145 to 140. [2020-07-21 23:19:07,460 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 140 states. [2020-07-21 23:19:07,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 150 transitions. [2020-07-21 23:19:07,461 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 150 transitions. Word has length 149 [2020-07-21 23:19:07,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:19:07,462 INFO L479 AbstractCegarLoop]: Abstraction has 140 states and 150 transitions. [2020-07-21 23:19:07,462 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 23:19:07,462 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 150 transitions. [2020-07-21 23:19:07,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 166 [2020-07-21 23:19:07,464 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:19:07,464 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 16, 15, 15, 15, 15, 15, 15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:19:07,677 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:19:07,678 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:19:07,678 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:19:07,678 INFO L82 PathProgramCache]: Analyzing trace with hash -869716604, now seen corresponding path program 21 times [2020-07-21 23:19:07,679 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:19:07,679 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [365653557] [2020-07-21 23:19:07,679 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 [2020-07-21 23:19:07,759 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:19:07,759 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:19:07,762 INFO L263 TraceCheckSpWp]: Trace formula consists of 438 conjuncts, 32 conjunts are in the unsatisfiable core [2020-07-21 23:19:07,765 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:19:08,256 INFO L134 CoverageAnalysis]: Checked inductivity of 1110 backedges. 532 proven. 210 refuted. 0 times theorem prover too weak. 368 trivial. 0 not checked. [2020-07-21 23:19:08,256 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:19:08,846 INFO L134 CoverageAnalysis]: Checked inductivity of 1110 backedges. 478 proven. 210 refuted. 0 times theorem prover too weak. 422 trivial. 0 not checked. [2020-07-21 23:19:08,846 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [365653557] [2020-07-21 23:19:08,846 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:19:08,846 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32] total 47 [2020-07-21 23:19:08,846 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [34464282] [2020-07-21 23:19:08,847 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-07-21 23:19:08,847 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:19:08,847 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-07-21 23:19:08,848 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=526, Invalid=1636, Unknown=0, NotChecked=0, Total=2162 [2020-07-21 23:19:08,848 INFO L87 Difference]: Start difference. First operand 140 states and 150 transitions. Second operand 47 states. [2020-07-21 23:19:09,601 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:19:09,602 INFO L93 Difference]: Finished difference Result 275 states and 330 transitions. [2020-07-21 23:19:09,602 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-07-21 23:19:09,602 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 165 [2020-07-21 23:19:09,602 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:19:09,604 INFO L225 Difference]: With dead ends: 275 [2020-07-21 23:19:09,604 INFO L226 Difference]: Without dead ends: 202 [2020-07-21 23:19:09,609 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 344 GetRequests, 269 SyntacticMatches, 15 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 931 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1021, Invalid=2761, Unknown=0, NotChecked=0, Total=3782 [2020-07-21 23:19:09,609 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2020-07-21 23:19:09,616 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 142. [2020-07-21 23:19:09,616 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 142 states. [2020-07-21 23:19:09,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 152 transitions. [2020-07-21 23:19:09,618 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 152 transitions. Word has length 165 [2020-07-21 23:19:09,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:19:09,618 INFO L479 AbstractCegarLoop]: Abstraction has 142 states and 152 transitions. [2020-07-21 23:19:09,618 INFO L480 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-07-21 23:19:09,618 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 152 transitions. [2020-07-21 23:19:09,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2020-07-21 23:19:09,620 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:19:09,620 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 16, 16, 15, 15, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:19:09,835 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:19:09,836 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:19:09,836 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:19:09,837 INFO L82 PathProgramCache]: Analyzing trace with hash -583456599, now seen corresponding path program 22 times [2020-07-21 23:19:09,837 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:19:09,837 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [423563412] [2020-07-21 23:19:09,838 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 [2020-07-21 23:19:09,909 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:19:09,910 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:19:09,911 INFO L263 TraceCheckSpWp]: Trace formula consists of 448 conjuncts, 34 conjunts are in the unsatisfiable core [2020-07-21 23:19:09,914 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:19:10,502 INFO L134 CoverageAnalysis]: Checked inductivity of 1140 backedges. 480 proven. 240 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2020-07-21 23:19:10,502 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:19:11,163 INFO L134 CoverageAnalysis]: Checked inductivity of 1140 backedges. 480 proven. 240 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2020-07-21 23:19:11,163 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [423563412] [2020-07-21 23:19:11,163 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:19:11,163 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34] total 50 [2020-07-21 23:19:11,164 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1448010718] [2020-07-21 23:19:11,164 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-07-21 23:19:11,164 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:19:11,164 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-07-21 23:19:11,165 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=593, Invalid=1857, Unknown=0, NotChecked=0, Total=2450 [2020-07-21 23:19:11,165 INFO L87 Difference]: Start difference. First operand 142 states and 152 transitions. Second operand 50 states. [2020-07-21 23:19:12,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:19:12,062 INFO L93 Difference]: Finished difference Result 279 states and 337 transitions. [2020-07-21 23:19:12,062 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-07-21 23:19:12,063 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 167 [2020-07-21 23:19:12,063 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:19:12,065 INFO L225 Difference]: With dead ends: 279 [2020-07-21 23:19:12,065 INFO L226 Difference]: Without dead ends: 208 [2020-07-21 23:19:12,072 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 349 GetRequests, 269 SyntacticMatches, 16 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1065 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1153, Invalid=3137, Unknown=0, NotChecked=0, Total=4290 [2020-07-21 23:19:12,072 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2020-07-21 23:19:12,081 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 144. [2020-07-21 23:19:12,082 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 144 states. [2020-07-21 23:19:12,083 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 154 transitions. [2020-07-21 23:19:12,083 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 154 transitions. Word has length 167 [2020-07-21 23:19:12,084 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:19:12,084 INFO L479 AbstractCegarLoop]: Abstraction has 144 states and 154 transitions. [2020-07-21 23:19:12,084 INFO L480 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-07-21 23:19:12,084 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 154 transitions. [2020-07-21 23:19:12,086 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 170 [2020-07-21 23:19:12,086 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:19:12,086 INFO L422 BasicCegarLoop]: trace histogram [17, 16, 16, 16, 16, 15, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:19:12,287 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:19:12,288 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:19:12,288 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:19:12,289 INFO L82 PathProgramCache]: Analyzing trace with hash -365498738, now seen corresponding path program 23 times [2020-07-21 23:19:12,289 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:19:12,289 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [614772452] [2020-07-21 23:19:12,289 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:19:12,414 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:19:12,414 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:19:12,417 INFO L263 TraceCheckSpWp]: Trace formula consists of 458 conjuncts, 35 conjunts are in the unsatisfiable core [2020-07-21 23:19:12,422 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:19:12,625 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 23:19:12,669 INFO L134 CoverageAnalysis]: Checked inductivity of 1172 backedges. 302 proven. 450 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2020-07-21 23:19:12,669 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:19:12,691 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 23:19:13,045 INFO L134 CoverageAnalysis]: Checked inductivity of 1172 backedges. 302 proven. 450 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2020-07-21 23:19:13,045 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [614772452] [2020-07-21 23:19:13,045 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:19:13,045 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 22 [2020-07-21 23:19:13,045 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [51739067] [2020-07-21 23:19:13,046 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-21 23:19:13,046 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:19:13,046 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-21 23:19:13,046 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=194, Invalid=268, Unknown=0, NotChecked=0, Total=462 [2020-07-21 23:19:13,046 INFO L87 Difference]: Start difference. First operand 144 states and 154 transitions. Second operand 22 states. [2020-07-21 23:19:13,261 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:19:13,261 INFO L93 Difference]: Finished difference Result 163 states and 175 transitions. [2020-07-21 23:19:13,262 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-07-21 23:19:13,262 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 169 [2020-07-21 23:19:13,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:19:13,264 INFO L225 Difference]: With dead ends: 163 [2020-07-21 23:19:13,264 INFO L226 Difference]: Without dead ends: 161 [2020-07-21 23:19:13,265 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 338 GetRequests, 285 SyntacticMatches, 32 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 367 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=198, Invalid=308, Unknown=0, NotChecked=0, Total=506 [2020-07-21 23:19:13,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 161 states. [2020-07-21 23:19:13,285 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 161 to 156. [2020-07-21 23:19:13,285 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 156 states. [2020-07-21 23:19:13,291 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 167 transitions. [2020-07-21 23:19:13,292 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 167 transitions. Word has length 169 [2020-07-21 23:19:13,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:19:13,293 INFO L479 AbstractCegarLoop]: Abstraction has 156 states and 167 transitions. [2020-07-21 23:19:13,293 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-21 23:19:13,293 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 167 transitions. [2020-07-21 23:19:13,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 186 [2020-07-21 23:19:13,295 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:19:13,296 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 18, 17, 17, 17, 17, 17, 17, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:19:13,509 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:19:13,509 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:19:13,510 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:19:13,510 INFO L82 PathProgramCache]: Analyzing trace with hash -760007568, now seen corresponding path program 24 times [2020-07-21 23:19:13,510 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:19:13,511 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [550574061] [2020-07-21 23:19:13,511 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 [2020-07-21 23:19:13,673 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:19:13,674 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:19:13,677 INFO L263 TraceCheckSpWp]: Trace formula consists of 492 conjuncts, 36 conjunts are in the unsatisfiable core [2020-07-21 23:19:13,683 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:19:14,301 INFO L134 CoverageAnalysis]: Checked inductivity of 1428 backedges. 672 proven. 272 refuted. 0 times theorem prover too weak. 484 trivial. 0 not checked. [2020-07-21 23:19:14,302 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:19:15,059 INFO L134 CoverageAnalysis]: Checked inductivity of 1428 backedges. 610 proven. 272 refuted. 0 times theorem prover too weak. 546 trivial. 0 not checked. [2020-07-21 23:19:15,060 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [550574061] [2020-07-21 23:19:15,060 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:19:15,060 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36] total 53 [2020-07-21 23:19:15,060 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1576292142] [2020-07-21 23:19:15,060 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2020-07-21 23:19:15,061 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:19:15,061 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2020-07-21 23:19:15,062 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=664, Invalid=2092, Unknown=0, NotChecked=0, Total=2756 [2020-07-21 23:19:15,062 INFO L87 Difference]: Start difference. First operand 156 states and 167 transitions. Second operand 53 states. [2020-07-21 23:19:16,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:19:16,100 INFO L93 Difference]: Finished difference Result 307 states and 369 transitions. [2020-07-21 23:19:16,100 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-07-21 23:19:16,100 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 185 [2020-07-21 23:19:16,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:19:16,102 INFO L225 Difference]: With dead ends: 307 [2020-07-21 23:19:16,102 INFO L226 Difference]: Without dead ends: 226 [2020-07-21 23:19:16,105 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 386 GetRequests, 301 SyntacticMatches, 17 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1208 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1293, Invalid=3537, Unknown=0, NotChecked=0, Total=4830 [2020-07-21 23:19:16,106 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 226 states. [2020-07-21 23:19:16,114 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 226 to 158. [2020-07-21 23:19:16,115 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 158 states. [2020-07-21 23:19:16,116 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 158 states to 158 states and 169 transitions. [2020-07-21 23:19:16,116 INFO L78 Accepts]: Start accepts. Automaton has 158 states and 169 transitions. Word has length 185 [2020-07-21 23:19:16,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:19:16,117 INFO L479 AbstractCegarLoop]: Abstraction has 158 states and 169 transitions. [2020-07-21 23:19:16,117 INFO L480 AbstractCegarLoop]: Interpolant automaton has 53 states. [2020-07-21 23:19:16,117 INFO L276 IsEmpty]: Start isEmpty. Operand 158 states and 169 transitions. [2020-07-21 23:19:16,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 188 [2020-07-21 23:19:16,118 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:19:16,118 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 18, 18, 17, 17, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:19:16,333 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:19:16,334 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:19:16,334 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:19:16,335 INFO L82 PathProgramCache]: Analyzing trace with hash -1861014763, now seen corresponding path program 25 times [2020-07-21 23:19:16,335 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:19:16,335 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [646178061] [2020-07-21 23:19:16,335 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 [2020-07-21 23:19:16,425 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:19:16,426 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:19:16,427 INFO L263 TraceCheckSpWp]: Trace formula consists of 502 conjuncts, 38 conjunts are in the unsatisfiable core [2020-07-21 23:19:16,430 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:19:17,132 INFO L134 CoverageAnalysis]: Checked inductivity of 1462 backedges. 612 proven. 306 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2020-07-21 23:19:17,132 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:19:17,960 INFO L134 CoverageAnalysis]: Checked inductivity of 1462 backedges. 612 proven. 306 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2020-07-21 23:19:17,960 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [646178061] [2020-07-21 23:19:17,960 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:19:17,960 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38] total 56 [2020-07-21 23:19:17,961 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1910271872] [2020-07-21 23:19:17,962 INFO L459 AbstractCegarLoop]: Interpolant automaton has 56 states [2020-07-21 23:19:17,962 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:19:17,962 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2020-07-21 23:19:17,963 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=739, Invalid=2341, Unknown=0, NotChecked=0, Total=3080 [2020-07-21 23:19:17,963 INFO L87 Difference]: Start difference. First operand 158 states and 169 transitions. Second operand 56 states. [2020-07-21 23:19:18,991 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:19:18,991 INFO L93 Difference]: Finished difference Result 311 states and 376 transitions. [2020-07-21 23:19:18,991 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-07-21 23:19:18,992 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 187 [2020-07-21 23:19:18,992 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:19:18,994 INFO L225 Difference]: With dead ends: 311 [2020-07-21 23:19:18,994 INFO L226 Difference]: Without dead ends: 232 [2020-07-21 23:19:18,996 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 391 GetRequests, 301 SyntacticMatches, 18 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1360 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1441, Invalid=3961, Unknown=0, NotChecked=0, Total=5402 [2020-07-21 23:19:18,996 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 232 states. [2020-07-21 23:19:19,009 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 232 to 160. [2020-07-21 23:19:19,010 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 160 states. [2020-07-21 23:19:19,011 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 171 transitions. [2020-07-21 23:19:19,011 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 171 transitions. Word has length 187 [2020-07-21 23:19:19,011 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:19:19,011 INFO L479 AbstractCegarLoop]: Abstraction has 160 states and 171 transitions. [2020-07-21 23:19:19,012 INFO L480 AbstractCegarLoop]: Interpolant automaton has 56 states. [2020-07-21 23:19:19,012 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 171 transitions. [2020-07-21 23:19:19,015 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2020-07-21 23:19:19,015 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:19:19,015 INFO L422 BasicCegarLoop]: trace histogram [19, 18, 18, 18, 18, 17, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:19:19,228 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:19:19,229 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:19:19,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:19:19,229 INFO L82 PathProgramCache]: Analyzing trace with hash 927992954, now seen corresponding path program 26 times [2020-07-21 23:19:19,230 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:19:19,230 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [648148033] [2020-07-21 23:19:19,230 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 [2020-07-21 23:19:19,317 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:19:19,317 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:19:19,320 INFO L263 TraceCheckSpWp]: Trace formula consists of 512 conjuncts, 39 conjunts are in the unsatisfiable core [2020-07-21 23:19:19,324 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:19:19,562 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 23:19:19,602 INFO L134 CoverageAnalysis]: Checked inductivity of 1498 backedges. 376 proven. 578 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2020-07-21 23:19:19,602 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:19:19,626 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 23:19:20,092 INFO L134 CoverageAnalysis]: Checked inductivity of 1498 backedges. 376 proven. 578 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2020-07-21 23:19:20,093 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [648148033] [2020-07-21 23:19:20,093 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:19:20,093 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23] total 24 [2020-07-21 23:19:20,093 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1562929706] [2020-07-21 23:19:20,094 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-21 23:19:20,094 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:19:20,094 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-21 23:19:20,094 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=235, Invalid=317, Unknown=0, NotChecked=0, Total=552 [2020-07-21 23:19:20,095 INFO L87 Difference]: Start difference. First operand 160 states and 171 transitions. Second operand 24 states. [2020-07-21 23:19:20,370 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:19:20,370 INFO L93 Difference]: Finished difference Result 179 states and 192 transitions. [2020-07-21 23:19:20,371 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-07-21 23:19:20,371 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 189 [2020-07-21 23:19:20,372 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:19:20,373 INFO L225 Difference]: With dead ends: 179 [2020-07-21 23:19:20,376 INFO L226 Difference]: Without dead ends: 177 [2020-07-21 23:19:20,378 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 378 GetRequests, 319 SyntacticMatches, 36 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 449 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=239, Invalid=361, Unknown=0, NotChecked=0, Total=600 [2020-07-21 23:19:20,379 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 177 states. [2020-07-21 23:19:20,392 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 177 to 172. [2020-07-21 23:19:20,392 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 172 states. [2020-07-21 23:19:20,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 184 transitions. [2020-07-21 23:19:20,395 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 184 transitions. Word has length 189 [2020-07-21 23:19:20,396 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:19:20,397 INFO L479 AbstractCegarLoop]: Abstraction has 172 states and 184 transitions. [2020-07-21 23:19:20,397 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-21 23:19:20,397 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 184 transitions. [2020-07-21 23:19:20,399 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 206 [2020-07-21 23:19:20,400 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:19:20,400 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 20, 19, 19, 19, 19, 19, 19, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:19:20,613 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:19:20,614 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:19:20,614 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:19:20,614 INFO L82 PathProgramCache]: Analyzing trace with hash 1753938524, now seen corresponding path program 27 times [2020-07-21 23:19:20,615 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:19:20,615 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [459653508] [2020-07-21 23:19:20,615 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 [2020-07-21 23:19:20,753 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:19:20,754 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:19:20,757 INFO L263 TraceCheckSpWp]: Trace formula consists of 546 conjuncts, 40 conjunts are in the unsatisfiable core [2020-07-21 23:19:20,774 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:19:21,602 INFO L134 CoverageAnalysis]: Checked inductivity of 1786 backedges. 828 proven. 342 refuted. 0 times theorem prover too weak. 616 trivial. 0 not checked. [2020-07-21 23:19:21,602 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:19:22,536 INFO L134 CoverageAnalysis]: Checked inductivity of 1786 backedges. 758 proven. 342 refuted. 0 times theorem prover too weak. 686 trivial. 0 not checked. [2020-07-21 23:19:22,536 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [459653508] [2020-07-21 23:19:22,536 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:19:22,536 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40] total 59 [2020-07-21 23:19:22,536 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1593089180] [2020-07-21 23:19:22,537 INFO L459 AbstractCegarLoop]: Interpolant automaton has 59 states [2020-07-21 23:19:22,537 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:19:22,537 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2020-07-21 23:19:22,538 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=818, Invalid=2604, Unknown=0, NotChecked=0, Total=3422 [2020-07-21 23:19:22,538 INFO L87 Difference]: Start difference. First operand 172 states and 184 transitions. Second operand 59 states. [2020-07-21 23:19:23,701 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:19:23,702 INFO L93 Difference]: Finished difference Result 339 states and 408 transitions. [2020-07-21 23:19:23,702 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-07-21 23:19:23,702 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 205 [2020-07-21 23:19:23,703 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:19:23,704 INFO L225 Difference]: With dead ends: 339 [2020-07-21 23:19:23,704 INFO L226 Difference]: Without dead ends: 250 [2020-07-21 23:19:23,706 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 428 GetRequests, 333 SyntacticMatches, 19 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1521 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1597, Invalid=4409, Unknown=0, NotChecked=0, Total=6006 [2020-07-21 23:19:23,706 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 250 states. [2020-07-21 23:19:23,714 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 250 to 174. [2020-07-21 23:19:23,715 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 174 states. [2020-07-21 23:19:23,715 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 186 transitions. [2020-07-21 23:19:23,716 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 186 transitions. Word has length 205 [2020-07-21 23:19:23,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:19:23,716 INFO L479 AbstractCegarLoop]: Abstraction has 174 states and 186 transitions. [2020-07-21 23:19:23,716 INFO L480 AbstractCegarLoop]: Interpolant automaton has 59 states. [2020-07-21 23:19:23,716 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 186 transitions. [2020-07-21 23:19:23,717 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 208 [2020-07-21 23:19:23,717 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:19:23,718 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 20, 20, 19, 19, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:19:23,931 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:19:23,932 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:19:23,932 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:19:23,933 INFO L82 PathProgramCache]: Analyzing trace with hash 1542073473, now seen corresponding path program 28 times [2020-07-21 23:19:23,933 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:19:23,933 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [109237777] [2020-07-21 23:19:23,933 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 [2020-07-21 23:19:24,024 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:19:24,025 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:19:24,027 INFO L263 TraceCheckSpWp]: Trace formula consists of 556 conjuncts, 42 conjunts are in the unsatisfiable core [2020-07-21 23:19:24,030 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:19:24,931 INFO L134 CoverageAnalysis]: Checked inductivity of 1824 backedges. 760 proven. 380 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2020-07-21 23:19:24,931 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:19:26,019 INFO L134 CoverageAnalysis]: Checked inductivity of 1824 backedges. 760 proven. 380 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2020-07-21 23:19:26,020 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [109237777] [2020-07-21 23:19:26,020 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:19:26,020 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42] total 62 [2020-07-21 23:19:26,020 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [800028164] [2020-07-21 23:19:26,021 INFO L459 AbstractCegarLoop]: Interpolant automaton has 62 states [2020-07-21 23:19:26,021 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:19:26,022 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2020-07-21 23:19:26,022 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=901, Invalid=2881, Unknown=0, NotChecked=0, Total=3782 [2020-07-21 23:19:26,022 INFO L87 Difference]: Start difference. First operand 174 states and 186 transitions. Second operand 62 states. [2020-07-21 23:19:27,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:19:27,369 INFO L93 Difference]: Finished difference Result 343 states and 415 transitions. [2020-07-21 23:19:27,369 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-07-21 23:19:27,369 INFO L78 Accepts]: Start accepts. Automaton has 62 states. Word has length 207 [2020-07-21 23:19:27,370 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:19:27,371 INFO L225 Difference]: With dead ends: 343 [2020-07-21 23:19:27,371 INFO L226 Difference]: Without dead ends: 256 [2020-07-21 23:19:27,372 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 433 GetRequests, 333 SyntacticMatches, 20 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1691 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=1761, Invalid=4881, Unknown=0, NotChecked=0, Total=6642 [2020-07-21 23:19:27,373 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 256 states. [2020-07-21 23:19:27,381 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 256 to 176. [2020-07-21 23:19:27,381 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 176 states. [2020-07-21 23:19:27,382 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 188 transitions. [2020-07-21 23:19:27,382 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 188 transitions. Word has length 207 [2020-07-21 23:19:27,382 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:19:27,382 INFO L479 AbstractCegarLoop]: Abstraction has 176 states and 188 transitions. [2020-07-21 23:19:27,382 INFO L480 AbstractCegarLoop]: Interpolant automaton has 62 states. [2020-07-21 23:19:27,383 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 188 transitions. [2020-07-21 23:19:27,384 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 210 [2020-07-21 23:19:27,384 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:19:27,384 INFO L422 BasicCegarLoop]: trace histogram [21, 20, 20, 20, 20, 19, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:19:27,597 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:19:27,598 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:19:27,598 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:19:27,599 INFO L82 PathProgramCache]: Analyzing trace with hash -196777626, now seen corresponding path program 29 times [2020-07-21 23:19:27,599 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:19:27,599 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1118418069] [2020-07-21 23:19:27,599 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 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:19:27,693 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:19:27,694 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:19:27,696 INFO L263 TraceCheckSpWp]: Trace formula consists of 566 conjuncts, 43 conjunts are in the unsatisfiable core [2020-07-21 23:19:27,700 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:19:27,985 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 23:19:28,038 INFO L134 CoverageAnalysis]: Checked inductivity of 1864 backedges. 458 proven. 722 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2020-07-21 23:19:28,039 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:19:28,065 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 23:19:28,631 INFO L134 CoverageAnalysis]: Checked inductivity of 1864 backedges. 458 proven. 722 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2020-07-21 23:19:28,631 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1118418069] [2020-07-21 23:19:28,631 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:19:28,632 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 26 [2020-07-21 23:19:28,632 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1087348941] [2020-07-21 23:19:28,632 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-07-21 23:19:28,632 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:19:28,632 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-07-21 23:19:28,632 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=280, Invalid=370, Unknown=0, NotChecked=0, Total=650 [2020-07-21 23:19:28,633 INFO L87 Difference]: Start difference. First operand 176 states and 188 transitions. Second operand 26 states. [2020-07-21 23:19:28,918 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:19:28,918 INFO L93 Difference]: Finished difference Result 195 states and 209 transitions. [2020-07-21 23:19:28,919 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-07-21 23:19:28,919 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 209 [2020-07-21 23:19:28,920 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:19:28,921 INFO L225 Difference]: With dead ends: 195 [2020-07-21 23:19:28,921 INFO L226 Difference]: Without dead ends: 193 [2020-07-21 23:19:28,922 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 418 GetRequests, 353 SyntacticMatches, 40 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 539 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=284, Invalid=418, Unknown=0, NotChecked=0, Total=702 [2020-07-21 23:19:28,922 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193 states. [2020-07-21 23:19:28,931 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193 to 188. [2020-07-21 23:19:28,931 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 188 states. [2020-07-21 23:19:28,932 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 188 states to 188 states and 201 transitions. [2020-07-21 23:19:28,932 INFO L78 Accepts]: Start accepts. Automaton has 188 states and 201 transitions. Word has length 209 [2020-07-21 23:19:28,933 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:19:28,933 INFO L479 AbstractCegarLoop]: Abstraction has 188 states and 201 transitions. [2020-07-21 23:19:28,933 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-07-21 23:19:28,933 INFO L276 IsEmpty]: Start isEmpty. Operand 188 states and 201 transitions. [2020-07-21 23:19:28,934 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 226 [2020-07-21 23:19:28,934 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:19:28,934 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 22, 21, 21, 21, 21, 21, 21, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:19:29,149 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:19:29,150 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:19:29,150 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:19:29,151 INFO L82 PathProgramCache]: Analyzing trace with hash 65077064, now seen corresponding path program 30 times [2020-07-21 23:19:29,151 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:19:29,151 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1184225381] [2020-07-21 23:19:29,152 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 [2020-07-21 23:19:29,247 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:19:29,248 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:19:29,250 INFO L263 TraceCheckSpWp]: Trace formula consists of 600 conjuncts, 44 conjunts are in the unsatisfiable core [2020-07-21 23:19:29,254 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:19:30,193 INFO L134 CoverageAnalysis]: Checked inductivity of 2184 backedges. 1000 proven. 420 refuted. 0 times theorem prover too weak. 764 trivial. 0 not checked. [2020-07-21 23:19:30,194 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:19:31,291 INFO L134 CoverageAnalysis]: Checked inductivity of 2184 backedges. 922 proven. 420 refuted. 0 times theorem prover too weak. 842 trivial. 0 not checked. [2020-07-21 23:19:31,292 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1184225381] [2020-07-21 23:19:31,292 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:19:31,292 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44] total 65 [2020-07-21 23:19:31,292 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [706157633] [2020-07-21 23:19:31,293 INFO L459 AbstractCegarLoop]: Interpolant automaton has 65 states [2020-07-21 23:19:31,293 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:19:31,293 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2020-07-21 23:19:31,293 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=988, Invalid=3172, Unknown=0, NotChecked=0, Total=4160 [2020-07-21 23:19:31,294 INFO L87 Difference]: Start difference. First operand 188 states and 201 transitions. Second operand 65 states. [2020-07-21 23:19:32,668 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:19:32,668 INFO L93 Difference]: Finished difference Result 371 states and 447 transitions. [2020-07-21 23:19:32,668 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-07-21 23:19:32,669 INFO L78 Accepts]: Start accepts. Automaton has 65 states. Word has length 225 [2020-07-21 23:19:32,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:19:32,670 INFO L225 Difference]: With dead ends: 371 [2020-07-21 23:19:32,670 INFO L226 Difference]: Without dead ends: 274 [2020-07-21 23:19:32,672 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 470 GetRequests, 365 SyntacticMatches, 21 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1870 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=1933, Invalid=5377, Unknown=0, NotChecked=0, Total=7310 [2020-07-21 23:19:32,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 274 states. [2020-07-21 23:19:32,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 274 to 190. [2020-07-21 23:19:32,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 190 states. [2020-07-21 23:19:32,683 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 203 transitions. [2020-07-21 23:19:32,684 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 203 transitions. Word has length 225 [2020-07-21 23:19:32,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:19:32,684 INFO L479 AbstractCegarLoop]: Abstraction has 190 states and 203 transitions. [2020-07-21 23:19:32,684 INFO L480 AbstractCegarLoop]: Interpolant automaton has 65 states. [2020-07-21 23:19:32,684 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 203 transitions. [2020-07-21 23:19:32,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 228 [2020-07-21 23:19:32,686 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:19:32,686 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 22, 22, 21, 21, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:19:32,899 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:19:32,900 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:19:32,900 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:19:32,900 INFO L82 PathProgramCache]: Analyzing trace with hash 1137618157, now seen corresponding path program 31 times [2020-07-21 23:19:32,901 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:19:32,901 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [704207257] [2020-07-21 23:19:32,901 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 [2020-07-21 23:19:33,009 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:19:33,010 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:19:33,012 INFO L263 TraceCheckSpWp]: Trace formula consists of 610 conjuncts, 46 conjunts are in the unsatisfiable core [2020-07-21 23:19:33,017 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:19:34,077 INFO L134 CoverageAnalysis]: Checked inductivity of 2226 backedges. 924 proven. 462 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2020-07-21 23:19:34,077 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:19:35,332 INFO L134 CoverageAnalysis]: Checked inductivity of 2226 backedges. 924 proven. 462 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2020-07-21 23:19:35,333 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [704207257] [2020-07-21 23:19:35,333 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:19:35,333 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 46] total 68 [2020-07-21 23:19:35,333 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [605429647] [2020-07-21 23:19:35,334 INFO L459 AbstractCegarLoop]: Interpolant automaton has 68 states [2020-07-21 23:19:35,334 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:19:35,334 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2020-07-21 23:19:35,334 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1079, Invalid=3477, Unknown=0, NotChecked=0, Total=4556 [2020-07-21 23:19:35,334 INFO L87 Difference]: Start difference. First operand 190 states and 203 transitions. Second operand 68 states. [2020-07-21 23:19:36,823 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:19:36,823 INFO L93 Difference]: Finished difference Result 375 states and 454 transitions. [2020-07-21 23:19:36,823 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-07-21 23:19:36,824 INFO L78 Accepts]: Start accepts. Automaton has 68 states. Word has length 227 [2020-07-21 23:19:36,824 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:19:36,826 INFO L225 Difference]: With dead ends: 375 [2020-07-21 23:19:36,826 INFO L226 Difference]: Without dead ends: 280 [2020-07-21 23:19:36,828 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 475 GetRequests, 365 SyntacticMatches, 22 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2058 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=2113, Invalid=5897, Unknown=0, NotChecked=0, Total=8010 [2020-07-21 23:19:36,828 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 280 states. [2020-07-21 23:19:36,837 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 280 to 192. [2020-07-21 23:19:36,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 192 states. [2020-07-21 23:19:36,838 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 205 transitions. [2020-07-21 23:19:36,839 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 205 transitions. Word has length 227 [2020-07-21 23:19:36,839 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:19:36,839 INFO L479 AbstractCegarLoop]: Abstraction has 192 states and 205 transitions. [2020-07-21 23:19:36,839 INFO L480 AbstractCegarLoop]: Interpolant automaton has 68 states. [2020-07-21 23:19:36,839 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 205 transitions. [2020-07-21 23:19:36,840 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 230 [2020-07-21 23:19:36,841 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:19:36,841 INFO L422 BasicCegarLoop]: trace histogram [23, 22, 22, 22, 22, 21, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:19:37,054 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:19:37,055 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:19:37,055 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:19:37,055 INFO L82 PathProgramCache]: Analyzing trace with hash 1057457490, now seen corresponding path program 32 times [2020-07-21 23:19:37,056 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:19:37,056 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1683664368] [2020-07-21 23:19:37,056 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 [2020-07-21 23:19:37,154 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:19:37,154 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:19:37,158 INFO L263 TraceCheckSpWp]: Trace formula consists of 620 conjuncts, 47 conjunts are in the unsatisfiable core [2020-07-21 23:19:37,162 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:19:37,507 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 23:19:37,570 INFO L134 CoverageAnalysis]: Checked inductivity of 2270 backedges. 548 proven. 882 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2020-07-21 23:19:37,570 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:19:37,600 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 23:19:38,261 INFO L134 CoverageAnalysis]: Checked inductivity of 2270 backedges. 548 proven. 882 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2020-07-21 23:19:38,262 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1683664368] [2020-07-21 23:19:38,262 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:19:38,262 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27] total 28 [2020-07-21 23:19:38,262 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1370829565] [2020-07-21 23:19:38,263 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-07-21 23:19:38,263 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:19:38,265 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-07-21 23:19:38,265 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=329, Invalid=427, Unknown=0, NotChecked=0, Total=756 [2020-07-21 23:19:38,265 INFO L87 Difference]: Start difference. First operand 192 states and 205 transitions. Second operand 28 states. [2020-07-21 23:19:38,545 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:19:38,545 INFO L93 Difference]: Finished difference Result 211 states and 226 transitions. [2020-07-21 23:19:38,546 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-07-21 23:19:38,546 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 229 [2020-07-21 23:19:38,547 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:19:38,548 INFO L225 Difference]: With dead ends: 211 [2020-07-21 23:19:38,548 INFO L226 Difference]: Without dead ends: 209 [2020-07-21 23:19:38,549 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 458 GetRequests, 387 SyntacticMatches, 44 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 637 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=333, Invalid=479, Unknown=0, NotChecked=0, Total=812 [2020-07-21 23:19:38,549 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2020-07-21 23:19:38,558 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 204. [2020-07-21 23:19:38,558 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 204 states. [2020-07-21 23:19:38,559 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 218 transitions. [2020-07-21 23:19:38,559 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 218 transitions. Word has length 229 [2020-07-21 23:19:38,559 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:19:38,560 INFO L479 AbstractCegarLoop]: Abstraction has 204 states and 218 transitions. [2020-07-21 23:19:38,560 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-07-21 23:19:38,560 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 218 transitions. [2020-07-21 23:19:38,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 246 [2020-07-21 23:19:38,561 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:19:38,561 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 24, 23, 23, 23, 23, 23, 23, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:19:38,774 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:19:38,775 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:19:38,775 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:19:38,776 INFO L82 PathProgramCache]: Analyzing trace with hash -777665740, now seen corresponding path program 33 times [2020-07-21 23:19:38,776 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:19:38,776 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1441816483] [2020-07-21 23:19:38,776 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 [2020-07-21 23:19:38,916 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:19:38,916 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:19:38,919 INFO L263 TraceCheckSpWp]: Trace formula consists of 654 conjuncts, 48 conjunts are in the unsatisfiable core [2020-07-21 23:19:38,923 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:19:40,374 INFO L134 CoverageAnalysis]: Checked inductivity of 2622 backedges. 1188 proven. 506 refuted. 0 times theorem prover too weak. 928 trivial. 0 not checked. [2020-07-21 23:19:40,374 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:19:41,746 INFO L134 CoverageAnalysis]: Checked inductivity of 2622 backedges. 1102 proven. 506 refuted. 0 times theorem prover too weak. 1014 trivial. 0 not checked. [2020-07-21 23:19:41,746 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1441816483] [2020-07-21 23:19:41,747 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:19:41,747 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48] total 71 [2020-07-21 23:19:41,747 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [822519278] [2020-07-21 23:19:41,748 INFO L459 AbstractCegarLoop]: Interpolant automaton has 71 states [2020-07-21 23:19:41,748 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:19:41,748 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2020-07-21 23:19:41,749 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1174, Invalid=3796, Unknown=0, NotChecked=0, Total=4970 [2020-07-21 23:19:41,749 INFO L87 Difference]: Start difference. First operand 204 states and 218 transitions. Second operand 71 states. [2020-07-21 23:19:43,342 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:19:43,342 INFO L93 Difference]: Finished difference Result 403 states and 486 transitions. [2020-07-21 23:19:43,342 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-07-21 23:19:43,343 INFO L78 Accepts]: Start accepts. Automaton has 71 states. Word has length 245 [2020-07-21 23:19:43,343 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:19:43,344 INFO L225 Difference]: With dead ends: 403 [2020-07-21 23:19:43,344 INFO L226 Difference]: Without dead ends: 298 [2020-07-21 23:19:43,347 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 512 GetRequests, 397 SyntacticMatches, 23 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2255 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=2301, Invalid=6441, Unknown=0, NotChecked=0, Total=8742 [2020-07-21 23:19:43,348 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 298 states. [2020-07-21 23:19:43,364 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 298 to 206. [2020-07-21 23:19:43,364 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 206 states. [2020-07-21 23:19:43,365 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 206 states to 206 states and 220 transitions. [2020-07-21 23:19:43,365 INFO L78 Accepts]: Start accepts. Automaton has 206 states and 220 transitions. Word has length 245 [2020-07-21 23:19:43,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:19:43,365 INFO L479 AbstractCegarLoop]: Abstraction has 206 states and 220 transitions. [2020-07-21 23:19:43,365 INFO L480 AbstractCegarLoop]: Interpolant automaton has 71 states. [2020-07-21 23:19:43,366 INFO L276 IsEmpty]: Start isEmpty. Operand 206 states and 220 transitions. [2020-07-21 23:19:43,367 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 248 [2020-07-21 23:19:43,367 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:19:43,367 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 24, 24, 23, 23, 23, 23, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:19:43,579 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:19:43,580 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:19:43,580 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:19:43,580 INFO L82 PathProgramCache]: Analyzing trace with hash 1435577433, now seen corresponding path program 34 times [2020-07-21 23:19:43,581 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:19:43,581 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1951490911] [2020-07-21 23:19:43,581 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 [2020-07-21 23:19:43,689 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:19:43,690 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:19:43,692 INFO L263 TraceCheckSpWp]: Trace formula consists of 664 conjuncts, 50 conjunts are in the unsatisfiable core [2020-07-21 23:19:43,697 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:19:44,907 INFO L134 CoverageAnalysis]: Checked inductivity of 2668 backedges. 1104 proven. 552 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2020-07-21 23:19:44,907 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:19:46,417 INFO L134 CoverageAnalysis]: Checked inductivity of 2668 backedges. 1104 proven. 552 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2020-07-21 23:19:46,417 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1951490911] [2020-07-21 23:19:46,417 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:19:46,418 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50] total 74 [2020-07-21 23:19:46,418 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [672512388] [2020-07-21 23:19:46,418 INFO L459 AbstractCegarLoop]: Interpolant automaton has 74 states [2020-07-21 23:19:46,418 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:19:46,419 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2020-07-21 23:19:46,419 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1273, Invalid=4129, Unknown=0, NotChecked=0, Total=5402 [2020-07-21 23:19:46,419 INFO L87 Difference]: Start difference. First operand 206 states and 220 transitions. Second operand 74 states. [2020-07-21 23:19:48,237 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:19:48,237 INFO L93 Difference]: Finished difference Result 407 states and 493 transitions. [2020-07-21 23:19:48,237 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2020-07-21 23:19:48,238 INFO L78 Accepts]: Start accepts. Automaton has 74 states. Word has length 247 [2020-07-21 23:19:48,238 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:19:48,240 INFO L225 Difference]: With dead ends: 407 [2020-07-21 23:19:48,240 INFO L226 Difference]: Without dead ends: 304 [2020-07-21 23:19:48,242 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 517 GetRequests, 397 SyntacticMatches, 24 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2461 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=2497, Invalid=7009, Unknown=0, NotChecked=0, Total=9506 [2020-07-21 23:19:48,242 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 304 states. [2020-07-21 23:19:48,251 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 304 to 208. [2020-07-21 23:19:48,251 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 208 states. [2020-07-21 23:19:48,252 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 208 states to 208 states and 222 transitions. [2020-07-21 23:19:48,253 INFO L78 Accepts]: Start accepts. Automaton has 208 states and 222 transitions. Word has length 247 [2020-07-21 23:19:48,253 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:19:48,253 INFO L479 AbstractCegarLoop]: Abstraction has 208 states and 222 transitions. [2020-07-21 23:19:48,253 INFO L480 AbstractCegarLoop]: Interpolant automaton has 74 states. [2020-07-21 23:19:48,253 INFO L276 IsEmpty]: Start isEmpty. Operand 208 states and 222 transitions. [2020-07-21 23:19:48,255 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 250 [2020-07-21 23:19:48,255 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:19:48,255 INFO L422 BasicCegarLoop]: trace histogram [25, 24, 24, 24, 24, 23, 23, 23, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:19:48,470 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:19:48,471 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:19:48,471 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:19:48,472 INFO L82 PathProgramCache]: Analyzing trace with hash -1941512130, now seen corresponding path program 35 times [2020-07-21 23:19:48,472 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:19:48,472 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [627589449] [2020-07-21 23:19:48,473 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 [2020-07-21 23:19:48,579 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:19:48,580 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:19:48,582 INFO L263 TraceCheckSpWp]: Trace formula consists of 674 conjuncts, 51 conjunts are in the unsatisfiable core [2020-07-21 23:19:48,585 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:19:49,005 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 23:19:49,073 INFO L134 CoverageAnalysis]: Checked inductivity of 2716 backedges. 646 proven. 1058 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2020-07-21 23:19:49,073 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:19:49,108 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 23:19:49,920 INFO L134 CoverageAnalysis]: Checked inductivity of 2716 backedges. 646 proven. 1058 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2020-07-21 23:19:49,920 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [627589449] [2020-07-21 23:19:49,921 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:19:49,921 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29] total 30 [2020-07-21 23:19:49,921 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [863010550] [2020-07-21 23:19:49,921 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-07-21 23:19:49,922 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:19:49,922 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-07-21 23:19:49,922 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=382, Invalid=488, Unknown=0, NotChecked=0, Total=870 [2020-07-21 23:19:49,922 INFO L87 Difference]: Start difference. First operand 208 states and 222 transitions. Second operand 30 states. [2020-07-21 23:19:50,241 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:19:50,242 INFO L93 Difference]: Finished difference Result 227 states and 243 transitions. [2020-07-21 23:19:50,242 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-07-21 23:19:50,243 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 249 [2020-07-21 23:19:50,243 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:19:50,245 INFO L225 Difference]: With dead ends: 227 [2020-07-21 23:19:50,245 INFO L226 Difference]: Without dead ends: 225 [2020-07-21 23:19:50,246 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 498 GetRequests, 421 SyntacticMatches, 48 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 743 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=386, Invalid=544, Unknown=0, NotChecked=0, Total=930 [2020-07-21 23:19:50,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 225 states. [2020-07-21 23:19:50,255 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 225 to 220. [2020-07-21 23:19:50,256 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 220 states. [2020-07-21 23:19:50,256 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 220 states to 220 states and 235 transitions. [2020-07-21 23:19:50,257 INFO L78 Accepts]: Start accepts. Automaton has 220 states and 235 transitions. Word has length 249 [2020-07-21 23:19:50,257 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:19:50,257 INFO L479 AbstractCegarLoop]: Abstraction has 220 states and 235 transitions. [2020-07-21 23:19:50,257 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-07-21 23:19:50,257 INFO L276 IsEmpty]: Start isEmpty. Operand 220 states and 235 transitions. [2020-07-21 23:19:50,259 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 266 [2020-07-21 23:19:50,259 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:19:50,259 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 26, 25, 25, 25, 25, 25, 25, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:19:50,472 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:19:50,473 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:19:50,473 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:19:50,473 INFO L82 PathProgramCache]: Analyzing trace with hash -712391136, now seen corresponding path program 36 times [2020-07-21 23:19:50,473 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:19:50,473 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [705865089] [2020-07-21 23:19:50,473 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 [2020-07-21 23:19:50,594 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:19:50,594 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:19:50,596 INFO L263 TraceCheckSpWp]: Trace formula consists of 708 conjuncts, 52 conjunts are in the unsatisfiable core [2020-07-21 23:19:50,600 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:19:51,988 INFO L134 CoverageAnalysis]: Checked inductivity of 3100 backedges. 1392 proven. 600 refuted. 0 times theorem prover too weak. 1108 trivial. 0 not checked. [2020-07-21 23:19:51,988 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:19:53,612 INFO L134 CoverageAnalysis]: Checked inductivity of 3100 backedges. 1298 proven. 600 refuted. 0 times theorem prover too weak. 1202 trivial. 0 not checked. [2020-07-21 23:19:53,612 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [705865089] [2020-07-21 23:19:53,612 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:19:53,612 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52] total 77 [2020-07-21 23:19:53,612 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1181804128] [2020-07-21 23:19:53,616 INFO L459 AbstractCegarLoop]: Interpolant automaton has 77 states [2020-07-21 23:19:53,616 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:19:53,616 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2020-07-21 23:19:53,617 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1376, Invalid=4476, Unknown=0, NotChecked=0, Total=5852 [2020-07-21 23:19:53,617 INFO L87 Difference]: Start difference. First operand 220 states and 235 transitions. Second operand 77 states. [2020-07-21 23:19:55,583 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:19:55,584 INFO L93 Difference]: Finished difference Result 435 states and 525 transitions. [2020-07-21 23:19:55,584 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2020-07-21 23:19:55,584 INFO L78 Accepts]: Start accepts. Automaton has 77 states. Word has length 265 [2020-07-21 23:19:55,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:19:55,586 INFO L225 Difference]: With dead ends: 435 [2020-07-21 23:19:55,586 INFO L226 Difference]: Without dead ends: 322 [2020-07-21 23:19:55,587 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 554 GetRequests, 429 SyntacticMatches, 25 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2676 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=2701, Invalid=7601, Unknown=0, NotChecked=0, Total=10302 [2020-07-21 23:19:55,587 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 322 states. [2020-07-21 23:19:55,597 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 322 to 222. [2020-07-21 23:19:55,597 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 222 states. [2020-07-21 23:19:55,598 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 222 states to 222 states and 237 transitions. [2020-07-21 23:19:55,599 INFO L78 Accepts]: Start accepts. Automaton has 222 states and 237 transitions. Word has length 265 [2020-07-21 23:19:55,599 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:19:55,599 INFO L479 AbstractCegarLoop]: Abstraction has 222 states and 237 transitions. [2020-07-21 23:19:55,599 INFO L480 AbstractCegarLoop]: Interpolant automaton has 77 states. [2020-07-21 23:19:55,599 INFO L276 IsEmpty]: Start isEmpty. Operand 222 states and 237 transitions. [2020-07-21 23:19:55,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 268 [2020-07-21 23:19:55,601 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:19:55,601 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 26, 26, 25, 25, 25, 25, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:19:55,814 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:19:55,815 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:19:55,815 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:19:55,816 INFO L82 PathProgramCache]: Analyzing trace with hash -993908027, now seen corresponding path program 37 times [2020-07-21 23:19:55,816 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:19:55,816 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1407435578] [2020-07-21 23:19:55,817 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 [2020-07-21 23:19:55,938 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:19:55,938 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:19:55,941 INFO L263 TraceCheckSpWp]: Trace formula consists of 718 conjuncts, 54 conjunts are in the unsatisfiable core [2020-07-21 23:19:55,945 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:19:57,421 INFO L134 CoverageAnalysis]: Checked inductivity of 3150 backedges. 1300 proven. 650 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2020-07-21 23:19:57,421 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:19:59,186 INFO L134 CoverageAnalysis]: Checked inductivity of 3150 backedges. 1300 proven. 650 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2020-07-21 23:19:59,187 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1407435578] [2020-07-21 23:19:59,187 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:19:59,187 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 54] total 80 [2020-07-21 23:19:59,187 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [373184474] [2020-07-21 23:19:59,188 INFO L459 AbstractCegarLoop]: Interpolant automaton has 80 states [2020-07-21 23:19:59,188 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:19:59,188 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2020-07-21 23:19:59,189 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1483, Invalid=4837, Unknown=0, NotChecked=0, Total=6320 [2020-07-21 23:19:59,189 INFO L87 Difference]: Start difference. First operand 222 states and 237 transitions. Second operand 80 states. [2020-07-21 23:20:01,294 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:20:01,294 INFO L93 Difference]: Finished difference Result 439 states and 532 transitions. [2020-07-21 23:20:01,295 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2020-07-21 23:20:01,295 INFO L78 Accepts]: Start accepts. Automaton has 80 states. Word has length 267 [2020-07-21 23:20:01,295 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:20:01,296 INFO L225 Difference]: With dead ends: 439 [2020-07-21 23:20:01,296 INFO L226 Difference]: Without dead ends: 328 [2020-07-21 23:20:01,298 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 559 GetRequests, 429 SyntacticMatches, 26 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2900 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=2913, Invalid=8217, Unknown=0, NotChecked=0, Total=11130 [2020-07-21 23:20:01,299 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 328 states. [2020-07-21 23:20:01,309 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 328 to 224. [2020-07-21 23:20:01,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 224 states. [2020-07-21 23:20:01,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 224 states to 224 states and 239 transitions. [2020-07-21 23:20:01,310 INFO L78 Accepts]: Start accepts. Automaton has 224 states and 239 transitions. Word has length 267 [2020-07-21 23:20:01,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:20:01,311 INFO L479 AbstractCegarLoop]: Abstraction has 224 states and 239 transitions. [2020-07-21 23:20:01,311 INFO L480 AbstractCegarLoop]: Interpolant automaton has 80 states. [2020-07-21 23:20:01,311 INFO L276 IsEmpty]: Start isEmpty. Operand 224 states and 239 transitions. [2020-07-21 23:20:01,313 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 270 [2020-07-21 23:20:01,313 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:20:01,313 INFO L422 BasicCegarLoop]: trace histogram [27, 26, 26, 26, 26, 25, 25, 25, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:20:01,526 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:20:01,527 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:20:01,527 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:20:01,527 INFO L82 PathProgramCache]: Analyzing trace with hash -948700630, now seen corresponding path program 38 times [2020-07-21 23:20:01,528 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:20:01,528 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [575251749] [2020-07-21 23:20:01,528 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 [2020-07-21 23:20:01,653 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:20:01,653 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:20:01,656 INFO L263 TraceCheckSpWp]: Trace formula consists of 728 conjuncts, 55 conjunts are in the unsatisfiable core [2020-07-21 23:20:01,660 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:20:02,118 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 23:20:02,195 INFO L134 CoverageAnalysis]: Checked inductivity of 3202 backedges. 752 proven. 1250 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2020-07-21 23:20:02,195 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:20:02,234 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 23:20:03,248 INFO L134 CoverageAnalysis]: Checked inductivity of 3202 backedges. 752 proven. 1250 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2020-07-21 23:20:03,248 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [575251749] [2020-07-21 23:20:03,248 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:20:03,249 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31] total 32 [2020-07-21 23:20:03,249 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1148023123] [2020-07-21 23:20:03,249 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-07-21 23:20:03,250 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:20:03,250 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-07-21 23:20:03,250 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=439, Invalid=553, Unknown=0, NotChecked=0, Total=992 [2020-07-21 23:20:03,250 INFO L87 Difference]: Start difference. First operand 224 states and 239 transitions. Second operand 32 states. [2020-07-21 23:20:03,606 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:20:03,606 INFO L93 Difference]: Finished difference Result 243 states and 260 transitions. [2020-07-21 23:20:03,611 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-07-21 23:20:03,611 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 269 [2020-07-21 23:20:03,611 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:20:03,613 INFO L225 Difference]: With dead ends: 243 [2020-07-21 23:20:03,613 INFO L226 Difference]: Without dead ends: 241 [2020-07-21 23:20:03,613 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 538 GetRequests, 455 SyntacticMatches, 52 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 857 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=443, Invalid=613, Unknown=0, NotChecked=0, Total=1056 [2020-07-21 23:20:03,614 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 241 states. [2020-07-21 23:20:03,623 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 241 to 236. [2020-07-21 23:20:03,623 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 236 states. [2020-07-21 23:20:03,624 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 236 states to 236 states and 252 transitions. [2020-07-21 23:20:03,625 INFO L78 Accepts]: Start accepts. Automaton has 236 states and 252 transitions. Word has length 269 [2020-07-21 23:20:03,625 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:20:03,625 INFO L479 AbstractCegarLoop]: Abstraction has 236 states and 252 transitions. [2020-07-21 23:20:03,625 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-07-21 23:20:03,625 INFO L276 IsEmpty]: Start isEmpty. Operand 236 states and 252 transitions. [2020-07-21 23:20:03,627 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 286 [2020-07-21 23:20:03,627 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:20:03,628 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 28, 27, 27, 27, 27, 27, 27, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:20:03,840 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:20:03,841 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:20:03,841 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:20:03,842 INFO L82 PathProgramCache]: Analyzing trace with hash 167610380, now seen corresponding path program 39 times [2020-07-21 23:20:03,842 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:20:03,842 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1033387522] [2020-07-21 23:20:03,843 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 [2020-07-21 23:20:03,957 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:20:03,957 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:20:03,959 INFO L263 TraceCheckSpWp]: Trace formula consists of 762 conjuncts, 56 conjunts are in the unsatisfiable core [2020-07-21 23:20:03,962 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:20:05,667 INFO L134 CoverageAnalysis]: Checked inductivity of 3618 backedges. 1612 proven. 702 refuted. 0 times theorem prover too weak. 1304 trivial. 0 not checked. [2020-07-21 23:20:05,668 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:20:07,600 INFO L134 CoverageAnalysis]: Checked inductivity of 3618 backedges. 1510 proven. 702 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2020-07-21 23:20:07,600 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1033387522] [2020-07-21 23:20:07,601 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:20:07,601 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 56] total 83 [2020-07-21 23:20:07,601 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1486081890] [2020-07-21 23:20:07,602 INFO L459 AbstractCegarLoop]: Interpolant automaton has 83 states [2020-07-21 23:20:07,602 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:20:07,602 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2020-07-21 23:20:07,603 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1594, Invalid=5212, Unknown=0, NotChecked=0, Total=6806 [2020-07-21 23:20:07,603 INFO L87 Difference]: Start difference. First operand 236 states and 252 transitions. Second operand 83 states. [2020-07-21 23:20:09,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:20:09,817 INFO L93 Difference]: Finished difference Result 467 states and 564 transitions. [2020-07-21 23:20:09,818 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2020-07-21 23:20:09,818 INFO L78 Accepts]: Start accepts. Automaton has 83 states. Word has length 285 [2020-07-21 23:20:09,818 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:20:09,821 INFO L225 Difference]: With dead ends: 467 [2020-07-21 23:20:09,821 INFO L226 Difference]: Without dead ends: 346 [2020-07-21 23:20:09,823 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 596 GetRequests, 461 SyntacticMatches, 27 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3133 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=3133, Invalid=8857, Unknown=0, NotChecked=0, Total=11990 [2020-07-21 23:20:09,823 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 346 states. [2020-07-21 23:20:09,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 346 to 238. [2020-07-21 23:20:09,833 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 238 states. [2020-07-21 23:20:09,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 238 states to 238 states and 254 transitions. [2020-07-21 23:20:09,834 INFO L78 Accepts]: Start accepts. Automaton has 238 states and 254 transitions. Word has length 285 [2020-07-21 23:20:09,834 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:20:09,834 INFO L479 AbstractCegarLoop]: Abstraction has 238 states and 254 transitions. [2020-07-21 23:20:09,834 INFO L480 AbstractCegarLoop]: Interpolant automaton has 83 states. [2020-07-21 23:20:09,834 INFO L276 IsEmpty]: Start isEmpty. Operand 238 states and 254 transitions. [2020-07-21 23:20:09,836 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 288 [2020-07-21 23:20:09,836 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:20:09,836 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 28, 28, 27, 27, 27, 27, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:20:10,051 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:20:10,052 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:20:10,052 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:20:10,053 INFO L82 PathProgramCache]: Analyzing trace with hash 196225073, now seen corresponding path program 40 times [2020-07-21 23:20:10,053 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:20:10,053 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2044508583] [2020-07-21 23:20:10,053 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 [2020-07-21 23:20:10,167 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:20:10,167 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:20:10,170 INFO L263 TraceCheckSpWp]: Trace formula consists of 772 conjuncts, 58 conjunts are in the unsatisfiable core [2020-07-21 23:20:10,173 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:20:11,930 INFO L134 CoverageAnalysis]: Checked inductivity of 3672 backedges. 1512 proven. 756 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2020-07-21 23:20:11,930 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:20:14,010 INFO L134 CoverageAnalysis]: Checked inductivity of 3672 backedges. 1512 proven. 756 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2020-07-21 23:20:14,010 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2044508583] [2020-07-21 23:20:14,010 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:20:14,011 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 58] total 86 [2020-07-21 23:20:14,011 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [387507038] [2020-07-21 23:20:14,012 INFO L459 AbstractCegarLoop]: Interpolant automaton has 86 states [2020-07-21 23:20:14,012 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:20:14,012 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2020-07-21 23:20:14,013 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1709, Invalid=5601, Unknown=0, NotChecked=0, Total=7310 [2020-07-21 23:20:14,013 INFO L87 Difference]: Start difference. First operand 238 states and 254 transitions. Second operand 86 states. [2020-07-21 23:20:16,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:20:16,309 INFO L93 Difference]: Finished difference Result 471 states and 571 transitions. [2020-07-21 23:20:16,310 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2020-07-21 23:20:16,310 INFO L78 Accepts]: Start accepts. Automaton has 86 states. Word has length 287 [2020-07-21 23:20:16,310 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:20:16,312 INFO L225 Difference]: With dead ends: 471 [2020-07-21 23:20:16,312 INFO L226 Difference]: Without dead ends: 352 [2020-07-21 23:20:16,314 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 601 GetRequests, 461 SyntacticMatches, 28 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3375 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=3361, Invalid=9521, Unknown=0, NotChecked=0, Total=12882 [2020-07-21 23:20:16,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 352 states. [2020-07-21 23:20:16,327 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 352 to 240. [2020-07-21 23:20:16,327 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 240 states. [2020-07-21 23:20:16,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 240 states to 240 states and 256 transitions. [2020-07-21 23:20:16,328 INFO L78 Accepts]: Start accepts. Automaton has 240 states and 256 transitions. Word has length 287 [2020-07-21 23:20:16,328 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:20:16,330 INFO L479 AbstractCegarLoop]: Abstraction has 240 states and 256 transitions. [2020-07-21 23:20:16,330 INFO L480 AbstractCegarLoop]: Interpolant automaton has 86 states. [2020-07-21 23:20:16,330 INFO L276 IsEmpty]: Start isEmpty. Operand 240 states and 256 transitions. [2020-07-21 23:20:16,332 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 290 [2020-07-21 23:20:16,332 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:20:16,333 INFO L422 BasicCegarLoop]: trace histogram [29, 28, 28, 28, 28, 27, 27, 27, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:20:16,550 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:20:16,551 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:20:16,551 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:20:16,551 INFO L82 PathProgramCache]: Analyzing trace with hash 1925141270, now seen corresponding path program 41 times [2020-07-21 23:20:16,552 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:20:16,552 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [679833444] [2020-07-21 23:20:16,552 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 [2020-07-21 23:20:16,665 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:20:16,666 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:20:16,668 INFO L263 TraceCheckSpWp]: Trace formula consists of 782 conjuncts, 59 conjunts are in the unsatisfiable core [2020-07-21 23:20:16,671 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:20:17,260 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 23:20:17,339 INFO L134 CoverageAnalysis]: Checked inductivity of 3728 backedges. 866 proven. 1458 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2020-07-21 23:20:17,339 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:20:17,379 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 23:20:18,587 INFO L134 CoverageAnalysis]: Checked inductivity of 3728 backedges. 866 proven. 1458 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2020-07-21 23:20:18,588 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [679833444] [2020-07-21 23:20:18,588 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:20:18,588 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33] total 34 [2020-07-21 23:20:18,588 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [416129374] [2020-07-21 23:20:18,589 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-07-21 23:20:18,589 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:20:18,589 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-07-21 23:20:18,589 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=500, Invalid=622, Unknown=0, NotChecked=0, Total=1122 [2020-07-21 23:20:18,589 INFO L87 Difference]: Start difference. First operand 240 states and 256 transitions. Second operand 34 states. [2020-07-21 23:20:18,978 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:20:18,978 INFO L93 Difference]: Finished difference Result 259 states and 277 transitions. [2020-07-21 23:20:18,979 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-07-21 23:20:18,979 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 289 [2020-07-21 23:20:18,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:20:18,981 INFO L225 Difference]: With dead ends: 259 [2020-07-21 23:20:18,981 INFO L226 Difference]: Without dead ends: 257 [2020-07-21 23:20:18,982 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 578 GetRequests, 489 SyntacticMatches, 56 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 979 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=504, Invalid=686, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 23:20:18,982 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 257 states. [2020-07-21 23:20:18,990 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 257 to 252. [2020-07-21 23:20:18,991 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 252 states. [2020-07-21 23:20:18,992 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 252 states to 252 states and 269 transitions. [2020-07-21 23:20:18,992 INFO L78 Accepts]: Start accepts. Automaton has 252 states and 269 transitions. Word has length 289 [2020-07-21 23:20:18,992 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:20:18,992 INFO L479 AbstractCegarLoop]: Abstraction has 252 states and 269 transitions. [2020-07-21 23:20:18,992 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-07-21 23:20:18,992 INFO L276 IsEmpty]: Start isEmpty. Operand 252 states and 269 transitions. [2020-07-21 23:20:18,994 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 306 [2020-07-21 23:20:18,994 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:20:18,994 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 30, 29, 29, 29, 29, 29, 29, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:20:19,207 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:20:19,208 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:20:19,208 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:20:19,208 INFO L82 PathProgramCache]: Analyzing trace with hash -2144237320, now seen corresponding path program 42 times [2020-07-21 23:20:19,209 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:20:19,209 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [882792332] [2020-07-21 23:20:19,209 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 [2020-07-21 23:20:19,328 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:20:19,328 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:20:19,331 INFO L263 TraceCheckSpWp]: Trace formula consists of 816 conjuncts, 60 conjunts are in the unsatisfiable core [2020-07-21 23:20:19,334 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:20:21,262 INFO L134 CoverageAnalysis]: Checked inductivity of 4176 backedges. 1848 proven. 812 refuted. 0 times theorem prover too weak. 1516 trivial. 0 not checked. [2020-07-21 23:20:21,262 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:20:23,445 INFO L134 CoverageAnalysis]: Checked inductivity of 4176 backedges. 1738 proven. 812 refuted. 0 times theorem prover too weak. 1626 trivial. 0 not checked. [2020-07-21 23:20:23,446 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [882792332] [2020-07-21 23:20:23,446 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:20:23,446 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 60] total 89 [2020-07-21 23:20:23,446 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [120543036] [2020-07-21 23:20:23,447 INFO L459 AbstractCegarLoop]: Interpolant automaton has 89 states [2020-07-21 23:20:23,447 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:20:23,447 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2020-07-21 23:20:23,448 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1828, Invalid=6004, Unknown=0, NotChecked=0, Total=7832 [2020-07-21 23:20:23,448 INFO L87 Difference]: Start difference. First operand 252 states and 269 transitions. Second operand 89 states. [2020-07-21 23:20:25,944 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:20:25,945 INFO L93 Difference]: Finished difference Result 499 states and 603 transitions. [2020-07-21 23:20:25,945 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2020-07-21 23:20:25,945 INFO L78 Accepts]: Start accepts. Automaton has 89 states. Word has length 305 [2020-07-21 23:20:25,945 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:20:25,947 INFO L225 Difference]: With dead ends: 499 [2020-07-21 23:20:25,947 INFO L226 Difference]: Without dead ends: 370 [2020-07-21 23:20:25,949 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 638 GetRequests, 493 SyntacticMatches, 29 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3626 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=3597, Invalid=10209, Unknown=0, NotChecked=0, Total=13806 [2020-07-21 23:20:25,950 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 370 states. [2020-07-21 23:20:25,961 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 370 to 254. [2020-07-21 23:20:25,962 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 254 states. [2020-07-21 23:20:25,963 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 254 states to 254 states and 271 transitions. [2020-07-21 23:20:25,963 INFO L78 Accepts]: Start accepts. Automaton has 254 states and 271 transitions. Word has length 305 [2020-07-21 23:20:25,963 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:20:25,963 INFO L479 AbstractCegarLoop]: Abstraction has 254 states and 271 transitions. [2020-07-21 23:20:25,963 INFO L480 AbstractCegarLoop]: Interpolant automaton has 89 states. [2020-07-21 23:20:25,963 INFO L276 IsEmpty]: Start isEmpty. Operand 254 states and 271 transitions. [2020-07-21 23:20:25,965 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 308 [2020-07-21 23:20:25,965 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:20:25,966 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 30, 30, 29, 29, 29, 29, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:20:26,177 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:20:26,178 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:20:26,178 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:20:26,178 INFO L82 PathProgramCache]: Analyzing trace with hash 191997085, now seen corresponding path program 43 times [2020-07-21 23:20:26,179 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:20:26,179 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1331108737] [2020-07-21 23:20:26,179 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 [2020-07-21 23:20:26,305 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:20:26,305 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:20:26,308 INFO L263 TraceCheckSpWp]: Trace formula consists of 826 conjuncts, 62 conjunts are in the unsatisfiable core [2020-07-21 23:20:26,311 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:20:28,387 INFO L134 CoverageAnalysis]: Checked inductivity of 4234 backedges. 1740 proven. 870 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2020-07-21 23:20:28,387 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:20:30,829 INFO L134 CoverageAnalysis]: Checked inductivity of 4234 backedges. 1740 proven. 870 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2020-07-21 23:20:30,830 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1331108737] [2020-07-21 23:20:30,830 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:20:30,830 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 62] total 92 [2020-07-21 23:20:30,830 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1838476863] [2020-07-21 23:20:30,831 INFO L459 AbstractCegarLoop]: Interpolant automaton has 92 states [2020-07-21 23:20:30,831 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:20:30,831 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 92 interpolants. [2020-07-21 23:20:30,832 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1951, Invalid=6421, Unknown=0, NotChecked=0, Total=8372 [2020-07-21 23:20:30,832 INFO L87 Difference]: Start difference. First operand 254 states and 271 transitions. Second operand 92 states. [2020-07-21 23:20:33,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:20:33,509 INFO L93 Difference]: Finished difference Result 503 states and 610 transitions. [2020-07-21 23:20:33,509 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2020-07-21 23:20:33,510 INFO L78 Accepts]: Start accepts. Automaton has 92 states. Word has length 307 [2020-07-21 23:20:33,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:20:33,511 INFO L225 Difference]: With dead ends: 503 [2020-07-21 23:20:33,511 INFO L226 Difference]: Without dead ends: 376 [2020-07-21 23:20:33,512 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 643 GetRequests, 493 SyntacticMatches, 30 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3886 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=3841, Invalid=10921, Unknown=0, NotChecked=0, Total=14762 [2020-07-21 23:20:33,513 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 376 states. [2020-07-21 23:20:33,524 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 376 to 256. [2020-07-21 23:20:33,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 256 states. [2020-07-21 23:20:33,525 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 256 states to 256 states and 273 transitions. [2020-07-21 23:20:33,525 INFO L78 Accepts]: Start accepts. Automaton has 256 states and 273 transitions. Word has length 307 [2020-07-21 23:20:33,525 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:20:33,525 INFO L479 AbstractCegarLoop]: Abstraction has 256 states and 273 transitions. [2020-07-21 23:20:33,525 INFO L480 AbstractCegarLoop]: Interpolant automaton has 92 states. [2020-07-21 23:20:33,525 INFO L276 IsEmpty]: Start isEmpty. Operand 256 states and 273 transitions. [2020-07-21 23:20:33,527 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 310 [2020-07-21 23:20:33,527 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:20:33,528 INFO L422 BasicCegarLoop]: trace histogram [31, 30, 30, 30, 30, 29, 29, 29, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:20:33,741 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:20:33,742 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:20:33,742 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:20:33,742 INFO L82 PathProgramCache]: Analyzing trace with hash -954635518, now seen corresponding path program 44 times [2020-07-21 23:20:33,742 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:20:33,742 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [85317195] [2020-07-21 23:20:33,742 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 [2020-07-21 23:20:33,865 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:20:33,865 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:20:33,867 INFO L263 TraceCheckSpWp]: Trace formula consists of 836 conjuncts, 63 conjunts are in the unsatisfiable core [2020-07-21 23:20:33,871 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:20:34,564 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 23:20:34,664 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 988 proven. 1682 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2020-07-21 23:20:34,664 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:20:34,712 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 23:20:36,111 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 988 proven. 1682 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2020-07-21 23:20:36,111 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [85317195] [2020-07-21 23:20:36,111 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:20:36,111 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35] total 36 [2020-07-21 23:20:36,112 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1437717102] [2020-07-21 23:20:36,112 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-07-21 23:20:36,112 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:20:36,112 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-07-21 23:20:36,112 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=565, Invalid=695, Unknown=0, NotChecked=0, Total=1260 [2020-07-21 23:20:36,113 INFO L87 Difference]: Start difference. First operand 256 states and 273 transitions. Second operand 36 states. [2020-07-21 23:20:36,598 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:20:36,599 INFO L93 Difference]: Finished difference Result 275 states and 294 transitions. [2020-07-21 23:20:36,599 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-07-21 23:20:36,599 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 309 [2020-07-21 23:20:36,600 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:20:36,601 INFO L225 Difference]: With dead ends: 275 [2020-07-21 23:20:36,601 INFO L226 Difference]: Without dead ends: 273 [2020-07-21 23:20:36,602 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 618 GetRequests, 523 SyntacticMatches, 60 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1109 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=569, Invalid=763, Unknown=0, NotChecked=0, Total=1332 [2020-07-21 23:20:36,602 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 273 states. [2020-07-21 23:20:36,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 273 to 268. [2020-07-21 23:20:36,613 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 268 states. [2020-07-21 23:20:36,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 268 states to 268 states and 286 transitions. [2020-07-21 23:20:36,614 INFO L78 Accepts]: Start accepts. Automaton has 268 states and 286 transitions. Word has length 309 [2020-07-21 23:20:36,615 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:20:36,615 INFO L479 AbstractCegarLoop]: Abstraction has 268 states and 286 transitions. [2020-07-21 23:20:36,615 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-07-21 23:20:36,615 INFO L276 IsEmpty]: Start isEmpty. Operand 268 states and 286 transitions. [2020-07-21 23:20:36,617 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 326 [2020-07-21 23:20:36,617 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:20:36,617 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 32, 31, 31, 31, 31, 31, 31, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:20:36,830 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:20:36,831 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:20:36,831 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:20:36,832 INFO L82 PathProgramCache]: Analyzing trace with hash -2146023196, now seen corresponding path program 45 times [2020-07-21 23:20:36,832 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:20:36,832 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1063199859] [2020-07-21 23:20:36,833 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 [2020-07-21 23:20:36,960 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:20:36,961 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:20:36,963 INFO L263 TraceCheckSpWp]: Trace formula consists of 870 conjuncts, 64 conjunts are in the unsatisfiable core [2020-07-21 23:20:36,967 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:20:39,141 INFO L134 CoverageAnalysis]: Checked inductivity of 4774 backedges. 2100 proven. 930 refuted. 0 times theorem prover too weak. 1744 trivial. 0 not checked. [2020-07-21 23:20:39,141 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:20:41,788 INFO L134 CoverageAnalysis]: Checked inductivity of 4774 backedges. 1982 proven. 930 refuted. 0 times theorem prover too weak. 1862 trivial. 0 not checked. [2020-07-21 23:20:41,789 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1063199859] [2020-07-21 23:20:41,789 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:20:41,789 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [64, 64] total 95 [2020-07-21 23:20:41,789 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1919864606] [2020-07-21 23:20:41,790 INFO L459 AbstractCegarLoop]: Interpolant automaton has 95 states [2020-07-21 23:20:41,790 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:20:41,791 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 95 interpolants. [2020-07-21 23:20:41,791 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2078, Invalid=6852, Unknown=0, NotChecked=0, Total=8930 [2020-07-21 23:20:41,792 INFO L87 Difference]: Start difference. First operand 268 states and 286 transitions. Second operand 95 states. [2020-07-21 23:20:45,972 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:20:45,973 INFO L93 Difference]: Finished difference Result 531 states and 642 transitions. [2020-07-21 23:20:45,973 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2020-07-21 23:20:45,973 INFO L78 Accepts]: Start accepts. Automaton has 95 states. Word has length 325 [2020-07-21 23:20:45,974 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:20:45,977 INFO L225 Difference]: With dead ends: 531 [2020-07-21 23:20:45,977 INFO L226 Difference]: Without dead ends: 394 [2020-07-21 23:20:45,979 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 680 GetRequests, 525 SyntacticMatches, 31 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4155 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=4093, Invalid=11657, Unknown=0, NotChecked=0, Total=15750 [2020-07-21 23:20:45,980 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 394 states. [2020-07-21 23:20:46,002 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 394 to 270. [2020-07-21 23:20:46,002 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 270 states. [2020-07-21 23:20:46,004 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 270 states to 270 states and 288 transitions. [2020-07-21 23:20:46,004 INFO L78 Accepts]: Start accepts. Automaton has 270 states and 288 transitions. Word has length 325 [2020-07-21 23:20:46,004 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:20:46,005 INFO L479 AbstractCegarLoop]: Abstraction has 270 states and 288 transitions. [2020-07-21 23:20:46,005 INFO L480 AbstractCegarLoop]: Interpolant automaton has 95 states. [2020-07-21 23:20:46,005 INFO L276 IsEmpty]: Start isEmpty. Operand 270 states and 288 transitions. [2020-07-21 23:20:46,009 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 328 [2020-07-21 23:20:46,009 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:20:46,009 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 32, 32, 31, 31, 31, 31, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:20:46,222 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:20:46,223 INFO L427 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:20:46,223 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:20:46,224 INFO L82 PathProgramCache]: Analyzing trace with hash 735125513, now seen corresponding path program 46 times [2020-07-21 23:20:46,224 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:20:46,224 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [751958553] [2020-07-21 23:20:46,224 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 [2020-07-21 23:20:46,438 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:20:46,439 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:20:46,445 INFO L263 TraceCheckSpWp]: Trace formula consists of 880 conjuncts, 66 conjunts are in the unsatisfiable core [2020-07-21 23:20:46,450 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:20:49,718 INFO L134 CoverageAnalysis]: Checked inductivity of 4836 backedges. 1984 proven. 992 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2020-07-21 23:20:49,719 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:20:52,566 INFO L134 CoverageAnalysis]: Checked inductivity of 4836 backedges. 1984 proven. 992 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2020-07-21 23:20:52,567 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [751958553] [2020-07-21 23:20:52,567 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:20:52,567 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [66, 66] total 98 [2020-07-21 23:20:52,567 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1434270781] [2020-07-21 23:20:52,568 INFO L459 AbstractCegarLoop]: Interpolant automaton has 98 states [2020-07-21 23:20:52,568 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:20:52,568 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2020-07-21 23:20:52,569 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2209, Invalid=7297, Unknown=0, NotChecked=0, Total=9506 [2020-07-21 23:20:52,569 INFO L87 Difference]: Start difference. First operand 270 states and 288 transitions. Second operand 98 states. [2020-07-21 23:20:55,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:20:55,677 INFO L93 Difference]: Finished difference Result 535 states and 649 transitions. [2020-07-21 23:20:55,677 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2020-07-21 23:20:55,677 INFO L78 Accepts]: Start accepts. Automaton has 98 states. Word has length 327 [2020-07-21 23:20:55,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:20:55,679 INFO L225 Difference]: With dead ends: 535 [2020-07-21 23:20:55,679 INFO L226 Difference]: Without dead ends: 400 [2020-07-21 23:20:55,681 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 685 GetRequests, 525 SyntacticMatches, 32 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4433 ImplicationChecksByTransitivity, 7.1s TimeCoverageRelationStatistics Valid=4353, Invalid=12417, Unknown=0, NotChecked=0, Total=16770 [2020-07-21 23:20:55,682 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 400 states. [2020-07-21 23:20:55,694 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 400 to 272. [2020-07-21 23:20:55,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 272 states. [2020-07-21 23:20:55,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 272 states to 272 states and 290 transitions. [2020-07-21 23:20:55,696 INFO L78 Accepts]: Start accepts. Automaton has 272 states and 290 transitions. Word has length 327 [2020-07-21 23:20:55,696 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:20:55,696 INFO L479 AbstractCegarLoop]: Abstraction has 272 states and 290 transitions. [2020-07-21 23:20:55,696 INFO L480 AbstractCegarLoop]: Interpolant automaton has 98 states. [2020-07-21 23:20:55,696 INFO L276 IsEmpty]: Start isEmpty. Operand 272 states and 290 transitions. [2020-07-21 23:20:55,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 330 [2020-07-21 23:20:55,698 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:20:55,699 INFO L422 BasicCegarLoop]: trace histogram [33, 32, 32, 32, 32, 31, 31, 31, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:20:55,912 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:20:55,913 INFO L427 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:20:55,913 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:20:55,914 INFO L82 PathProgramCache]: Analyzing trace with hash -734871058, now seen corresponding path program 47 times [2020-07-21 23:20:55,914 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:20:55,914 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1308943864] [2020-07-21 23:20:55,914 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 [2020-07-21 23:20:56,052 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:20:56,052 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:20:56,055 INFO L263 TraceCheckSpWp]: Trace formula consists of 890 conjuncts, 67 conjunts are in the unsatisfiable core [2020-07-21 23:20:56,059 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:20:56,861 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 23:20:56,982 INFO L134 CoverageAnalysis]: Checked inductivity of 4900 backedges. 1118 proven. 1922 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2020-07-21 23:20:56,982 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:20:57,033 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 23:20:58,656 INFO L134 CoverageAnalysis]: Checked inductivity of 4900 backedges. 1118 proven. 1922 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2020-07-21 23:20:58,657 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1308943864] [2020-07-21 23:20:58,657 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:20:58,657 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37] total 38 [2020-07-21 23:20:58,657 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1471404699] [2020-07-21 23:20:58,658 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-07-21 23:20:58,658 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:20:58,658 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-07-21 23:20:58,658 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=634, Invalid=772, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 23:20:58,658 INFO L87 Difference]: Start difference. First operand 272 states and 290 transitions. Second operand 38 states. [2020-07-21 23:20:59,134 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:20:59,134 INFO L93 Difference]: Finished difference Result 291 states and 311 transitions. [2020-07-21 23:20:59,135 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-07-21 23:20:59,135 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 329 [2020-07-21 23:20:59,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:20:59,137 INFO L225 Difference]: With dead ends: 291 [2020-07-21 23:20:59,137 INFO L226 Difference]: Without dead ends: 289 [2020-07-21 23:20:59,138 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 658 GetRequests, 557 SyntacticMatches, 64 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1247 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=638, Invalid=844, Unknown=0, NotChecked=0, Total=1482 [2020-07-21 23:20:59,138 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 289 states. [2020-07-21 23:20:59,151 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 289 to 284. [2020-07-21 23:20:59,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 284 states. [2020-07-21 23:20:59,152 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 284 states to 284 states and 303 transitions. [2020-07-21 23:20:59,153 INFO L78 Accepts]: Start accepts. Automaton has 284 states and 303 transitions. Word has length 329 [2020-07-21 23:20:59,153 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:20:59,153 INFO L479 AbstractCegarLoop]: Abstraction has 284 states and 303 transitions. [2020-07-21 23:20:59,153 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-07-21 23:20:59,153 INFO L276 IsEmpty]: Start isEmpty. Operand 284 states and 303 transitions. [2020-07-21 23:20:59,155 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 346 [2020-07-21 23:20:59,156 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:20:59,156 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 34, 33, 33, 33, 33, 33, 33, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:20:59,369 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 51 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:20:59,370 INFO L427 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:20:59,370 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:20:59,370 INFO L82 PathProgramCache]: Analyzing trace with hash -1470347312, now seen corresponding path program 48 times [2020-07-21 23:20:59,370 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:20:59,370 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1428415300] [2020-07-21 23:20:59,371 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 [2020-07-21 23:20:59,506 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:20:59,507 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:20:59,510 INFO L263 TraceCheckSpWp]: Trace formula consists of 924 conjuncts, 68 conjunts are in the unsatisfiable core [2020-07-21 23:20:59,526 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:21:02,188 INFO L134 CoverageAnalysis]: Checked inductivity of 5412 backedges. 2368 proven. 1056 refuted. 0 times theorem prover too weak. 1988 trivial. 0 not checked. [2020-07-21 23:21:02,188 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:21:05,425 INFO L134 CoverageAnalysis]: Checked inductivity of 5412 backedges. 2242 proven. 1056 refuted. 0 times theorem prover too weak. 2114 trivial. 0 not checked. [2020-07-21 23:21:05,425 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1428415300] [2020-07-21 23:21:05,425 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:21:05,425 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 68] total 101 [2020-07-21 23:21:05,426 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1563550975] [2020-07-21 23:21:05,426 INFO L459 AbstractCegarLoop]: Interpolant automaton has 101 states [2020-07-21 23:21:05,426 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:21:05,427 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2020-07-21 23:21:05,427 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2344, Invalid=7756, Unknown=0, NotChecked=0, Total=10100 [2020-07-21 23:21:05,428 INFO L87 Difference]: Start difference. First operand 284 states and 303 transitions. Second operand 101 states. [2020-07-21 23:21:09,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:21:09,516 INFO L93 Difference]: Finished difference Result 563 states and 681 transitions. [2020-07-21 23:21:09,516 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2020-07-21 23:21:09,516 INFO L78 Accepts]: Start accepts. Automaton has 101 states. Word has length 345 [2020-07-21 23:21:09,517 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:21:09,519 INFO L225 Difference]: With dead ends: 563 [2020-07-21 23:21:09,519 INFO L226 Difference]: Without dead ends: 418 [2020-07-21 23:21:09,521 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 722 GetRequests, 557 SyntacticMatches, 33 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4720 ImplicationChecksByTransitivity, 7.1s TimeCoverageRelationStatistics Valid=4621, Invalid=13201, Unknown=0, NotChecked=0, Total=17822 [2020-07-21 23:21:09,521 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 418 states. [2020-07-21 23:21:09,533 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 418 to 286. [2020-07-21 23:21:09,533 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 286 states. [2020-07-21 23:21:09,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 286 states to 286 states and 305 transitions. [2020-07-21 23:21:09,534 INFO L78 Accepts]: Start accepts. Automaton has 286 states and 305 transitions. Word has length 345 [2020-07-21 23:21:09,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:21:09,535 INFO L479 AbstractCegarLoop]: Abstraction has 286 states and 305 transitions. [2020-07-21 23:21:09,535 INFO L480 AbstractCegarLoop]: Interpolant automaton has 101 states. [2020-07-21 23:21:09,535 INFO L276 IsEmpty]: Start isEmpty. Operand 286 states and 305 transitions. [2020-07-21 23:21:09,537 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 348 [2020-07-21 23:21:09,537 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:21:09,538 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 34, 34, 33, 33, 33, 33, 33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:21:09,750 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:21:09,751 INFO L427 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:21:09,751 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:21:09,751 INFO L82 PathProgramCache]: Analyzing trace with hash 2069961333, now seen corresponding path program 49 times [2020-07-21 23:21:09,751 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:21:09,751 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2024834872] [2020-07-21 23:21:09,751 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 53 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:21:09,890 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:21:09,890 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:21:09,894 INFO L263 TraceCheckSpWp]: Trace formula consists of 934 conjuncts, 70 conjunts are in the unsatisfiable core [2020-07-21 23:21:09,897 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:21:12,863 INFO L134 CoverageAnalysis]: Checked inductivity of 5478 backedges. 2244 proven. 1122 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2020-07-21 23:21:12,863 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:21:16,450 INFO L134 CoverageAnalysis]: Checked inductivity of 5478 backedges. 2244 proven. 1122 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2020-07-21 23:21:16,450 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2024834872] [2020-07-21 23:21:16,450 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:21:16,451 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [70, 70] total 104 [2020-07-21 23:21:16,451 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [424335310] [2020-07-21 23:21:16,451 INFO L459 AbstractCegarLoop]: Interpolant automaton has 104 states [2020-07-21 23:21:16,451 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:21:16,452 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 104 interpolants. [2020-07-21 23:21:16,452 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2483, Invalid=8229, Unknown=0, NotChecked=0, Total=10712 [2020-07-21 23:21:16,453 INFO L87 Difference]: Start difference. First operand 286 states and 305 transitions. Second operand 104 states. [2020-07-21 23:21:20,426 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:21:20,426 INFO L93 Difference]: Finished difference Result 567 states and 688 transitions. [2020-07-21 23:21:20,426 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2020-07-21 23:21:20,426 INFO L78 Accepts]: Start accepts. Automaton has 104 states. Word has length 347 [2020-07-21 23:21:20,427 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:21:20,429 INFO L225 Difference]: With dead ends: 567 [2020-07-21 23:21:20,429 INFO L226 Difference]: Without dead ends: 424 [2020-07-21 23:21:20,431 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 727 GetRequests, 557 SyntacticMatches, 34 SemanticMatches, 136 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5016 ImplicationChecksByTransitivity, 7.9s TimeCoverageRelationStatistics Valid=4897, Invalid=14009, Unknown=0, NotChecked=0, Total=18906 [2020-07-21 23:21:20,431 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 424 states. [2020-07-21 23:21:20,444 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 424 to 288. [2020-07-21 23:21:20,444 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 288 states. [2020-07-21 23:21:20,445 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 288 states to 288 states and 307 transitions. [2020-07-21 23:21:20,445 INFO L78 Accepts]: Start accepts. Automaton has 288 states and 307 transitions. Word has length 347 [2020-07-21 23:21:20,446 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:21:20,446 INFO L479 AbstractCegarLoop]: Abstraction has 288 states and 307 transitions. [2020-07-21 23:21:20,446 INFO L480 AbstractCegarLoop]: Interpolant automaton has 104 states. [2020-07-21 23:21:20,446 INFO L276 IsEmpty]: Start isEmpty. Operand 288 states and 307 transitions. [2020-07-21 23:21:20,448 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 350 [2020-07-21 23:21:20,448 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:21:20,448 INFO L422 BasicCegarLoop]: trace histogram [35, 34, 34, 34, 34, 33, 33, 33, 33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:21:20,661 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:21:20,662 INFO L427 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:21:20,662 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:21:20,663 INFO L82 PathProgramCache]: Analyzing trace with hash -1602496550, now seen corresponding path program 50 times [2020-07-21 23:21:20,663 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:21:20,663 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [984497185] [2020-07-21 23:21:20,663 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 54 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:21:20,802 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:21:20,802 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:21:20,806 INFO L263 TraceCheckSpWp]: Trace formula consists of 944 conjuncts, 71 conjunts are in the unsatisfiable core [2020-07-21 23:21:20,810 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:21:21,832 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 23:21:21,954 INFO L134 CoverageAnalysis]: Checked inductivity of 5546 backedges. 1256 proven. 2178 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2020-07-21 23:21:21,954 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:21:22,016 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 23:21:24,103 INFO L134 CoverageAnalysis]: Checked inductivity of 5546 backedges. 1256 proven. 2178 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2020-07-21 23:21:24,104 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [984497185] [2020-07-21 23:21:24,104 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:21:24,104 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39] total 40 [2020-07-21 23:21:24,104 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1781009341] [2020-07-21 23:21:24,105 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-07-21 23:21:24,105 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:21:24,105 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-07-21 23:21:24,105 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=707, Invalid=853, Unknown=0, NotChecked=0, Total=1560 [2020-07-21 23:21:24,105 INFO L87 Difference]: Start difference. First operand 288 states and 307 transitions. Second operand 40 states. [2020-07-21 23:21:24,738 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:21:24,738 INFO L93 Difference]: Finished difference Result 307 states and 328 transitions. [2020-07-21 23:21:24,739 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-07-21 23:21:24,739 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 349 [2020-07-21 23:21:24,740 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:21:24,741 INFO L225 Difference]: With dead ends: 307 [2020-07-21 23:21:24,742 INFO L226 Difference]: Without dead ends: 305 [2020-07-21 23:21:24,742 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 698 GetRequests, 591 SyntacticMatches, 68 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1393 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=711, Invalid=929, Unknown=0, NotChecked=0, Total=1640 [2020-07-21 23:21:24,742 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 305 states. [2020-07-21 23:21:24,754 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 305 to 300. [2020-07-21 23:21:24,754 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 300 states. [2020-07-21 23:21:24,755 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 300 states to 300 states and 320 transitions. [2020-07-21 23:21:24,755 INFO L78 Accepts]: Start accepts. Automaton has 300 states and 320 transitions. Word has length 349 [2020-07-21 23:21:24,755 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:21:24,756 INFO L479 AbstractCegarLoop]: Abstraction has 300 states and 320 transitions. [2020-07-21 23:21:24,756 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-07-21 23:21:24,756 INFO L276 IsEmpty]: Start isEmpty. Operand 300 states and 320 transitions. [2020-07-21 23:21:24,758 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 366 [2020-07-21 23:21:24,758 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:21:24,758 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 36, 35, 35, 35, 35, 35, 35, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:21:24,972 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:21:24,973 INFO L427 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:21:24,973 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:21:24,974 INFO L82 PathProgramCache]: Analyzing trace with hash 242484668, now seen corresponding path program 51 times [2020-07-21 23:21:24,974 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:21:24,974 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [613135096] [2020-07-21 23:21:24,975 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 55 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:21:25,118 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:21:25,118 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:21:25,122 INFO L263 TraceCheckSpWp]: Trace formula consists of 978 conjuncts, 72 conjunts are in the unsatisfiable core [2020-07-21 23:21:25,126 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:21:28,489 INFO L134 CoverageAnalysis]: Checked inductivity of 6090 backedges. 2652 proven. 1190 refuted. 0 times theorem prover too weak. 2248 trivial. 0 not checked. [2020-07-21 23:21:28,490 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:21:32,569 INFO L134 CoverageAnalysis]: Checked inductivity of 6090 backedges. 2518 proven. 1190 refuted. 0 times theorem prover too weak. 2382 trivial. 0 not checked. [2020-07-21 23:21:32,570 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [613135096] [2020-07-21 23:21:32,570 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:21:32,570 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [72, 72] total 107 [2020-07-21 23:21:32,570 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1471679839] [2020-07-21 23:21:32,571 INFO L459 AbstractCegarLoop]: Interpolant automaton has 107 states [2020-07-21 23:21:32,571 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:21:32,572 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 107 interpolants. [2020-07-21 23:21:32,572 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2626, Invalid=8716, Unknown=0, NotChecked=0, Total=11342 [2020-07-21 23:21:32,572 INFO L87 Difference]: Start difference. First operand 300 states and 320 transitions. Second operand 107 states. [2020-07-21 23:21:37,359 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:21:37,360 INFO L93 Difference]: Finished difference Result 595 states and 720 transitions. [2020-07-21 23:21:37,360 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2020-07-21 23:21:37,360 INFO L78 Accepts]: Start accepts. Automaton has 107 states. Word has length 365 [2020-07-21 23:21:37,360 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:21:37,362 INFO L225 Difference]: With dead ends: 595 [2020-07-21 23:21:37,362 INFO L226 Difference]: Without dead ends: 442 [2020-07-21 23:21:37,364 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 764 GetRequests, 589 SyntacticMatches, 35 SemanticMatches, 140 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5321 ImplicationChecksByTransitivity, 8.9s TimeCoverageRelationStatistics Valid=5181, Invalid=14841, Unknown=0, NotChecked=0, Total=20022 [2020-07-21 23:21:37,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 442 states. [2020-07-21 23:21:37,378 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 442 to 302. [2020-07-21 23:21:37,378 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 302 states. [2020-07-21 23:21:37,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 302 states to 302 states and 322 transitions. [2020-07-21 23:21:37,379 INFO L78 Accepts]: Start accepts. Automaton has 302 states and 322 transitions. Word has length 365 [2020-07-21 23:21:37,379 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:21:37,379 INFO L479 AbstractCegarLoop]: Abstraction has 302 states and 322 transitions. [2020-07-21 23:21:37,380 INFO L480 AbstractCegarLoop]: Interpolant automaton has 107 states. [2020-07-21 23:21:37,380 INFO L276 IsEmpty]: Start isEmpty. Operand 302 states and 322 transitions. [2020-07-21 23:21:37,382 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 368 [2020-07-21 23:21:37,382 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:21:37,382 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 36, 36, 35, 35, 35, 35, 35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:21:37,583 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:21:37,584 INFO L427 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:21:37,584 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:21:37,585 INFO L82 PathProgramCache]: Analyzing trace with hash -814607391, now seen corresponding path program 52 times [2020-07-21 23:21:37,585 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:21:37,585 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [117605110] [2020-07-21 23:21:37,586 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 56 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 56 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:21:37,729 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:21:37,730 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:21:37,733 INFO L263 TraceCheckSpWp]: Trace formula consists of 988 conjuncts, 74 conjunts are in the unsatisfiable core [2020-07-21 23:21:37,737 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:21:41,446 INFO L134 CoverageAnalysis]: Checked inductivity of 6160 backedges. 2520 proven. 1260 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2020-07-21 23:21:41,446 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:21:45,911 INFO L134 CoverageAnalysis]: Checked inductivity of 6160 backedges. 2520 proven. 1260 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2020-07-21 23:21:45,911 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [117605110] [2020-07-21 23:21:45,911 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:21:45,912 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [74, 74] total 110 [2020-07-21 23:21:45,912 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [820427740] [2020-07-21 23:21:45,912 INFO L459 AbstractCegarLoop]: Interpolant automaton has 110 states [2020-07-21 23:21:45,913 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:21:45,913 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 110 interpolants. [2020-07-21 23:21:45,914 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2773, Invalid=9217, Unknown=0, NotChecked=0, Total=11990 [2020-07-21 23:21:45,915 INFO L87 Difference]: Start difference. First operand 302 states and 322 transitions. Second operand 110 states. [2020-07-21 23:21:51,808 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:21:51,808 INFO L93 Difference]: Finished difference Result 599 states and 727 transitions. [2020-07-21 23:21:51,809 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2020-07-21 23:21:51,809 INFO L78 Accepts]: Start accepts. Automaton has 110 states. Word has length 367 [2020-07-21 23:21:51,809 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:21:51,811 INFO L225 Difference]: With dead ends: 599 [2020-07-21 23:21:51,811 INFO L226 Difference]: Without dead ends: 448 [2020-07-21 23:21:51,814 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 769 GetRequests, 589 SyntacticMatches, 36 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5635 ImplicationChecksByTransitivity, 10.0s TimeCoverageRelationStatistics Valid=5473, Invalid=15697, Unknown=0, NotChecked=0, Total=21170 [2020-07-21 23:21:51,815 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 448 states. [2020-07-21 23:21:51,830 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 448 to 304. [2020-07-21 23:21:51,830 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 304 states. [2020-07-21 23:21:51,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 304 states to 304 states and 324 transitions. [2020-07-21 23:21:51,831 INFO L78 Accepts]: Start accepts. Automaton has 304 states and 324 transitions. Word has length 367 [2020-07-21 23:21:51,831 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:21:51,832 INFO L479 AbstractCegarLoop]: Abstraction has 304 states and 324 transitions. [2020-07-21 23:21:51,832 INFO L480 AbstractCegarLoop]: Interpolant automaton has 110 states. [2020-07-21 23:21:51,832 INFO L276 IsEmpty]: Start isEmpty. Operand 304 states and 324 transitions. [2020-07-21 23:21:51,834 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 370 [2020-07-21 23:21:51,834 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:21:51,835 INFO L422 BasicCegarLoop]: trace histogram [37, 36, 36, 36, 36, 35, 35, 35, 35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:21:52,047 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 56 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:21:52,048 INFO L427 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:21:52,048 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:21:52,048 INFO L82 PathProgramCache]: Analyzing trace with hash 1227173062, now seen corresponding path program 53 times [2020-07-21 23:21:52,048 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:21:52,048 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1395568788] [2020-07-21 23:21:52,048 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 57 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 57 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:21:52,200 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:21:52,201 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:21:52,204 INFO L263 TraceCheckSpWp]: Trace formula consists of 998 conjuncts, 75 conjunts are in the unsatisfiable core [2020-07-21 23:21:52,207 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:21:53,427 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 23:21:53,561 INFO L134 CoverageAnalysis]: Checked inductivity of 6232 backedges. 1402 proven. 2450 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2020-07-21 23:21:53,561 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:21:53,625 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 23:21:56,289 INFO L134 CoverageAnalysis]: Checked inductivity of 6232 backedges. 1402 proven. 2450 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2020-07-21 23:21:56,289 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1395568788] [2020-07-21 23:21:56,290 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:21:56,290 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41] total 42 [2020-07-21 23:21:56,290 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1328551842] [2020-07-21 23:21:56,290 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-07-21 23:21:56,291 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:21:56,291 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-07-21 23:21:56,291 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=784, Invalid=938, Unknown=0, NotChecked=0, Total=1722 [2020-07-21 23:21:56,291 INFO L87 Difference]: Start difference. First operand 304 states and 324 transitions. Second operand 42 states. [2020-07-21 23:21:57,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:21:57,009 INFO L93 Difference]: Finished difference Result 323 states and 345 transitions. [2020-07-21 23:21:57,010 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-07-21 23:21:57,010 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 369 [2020-07-21 23:21:57,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:21:57,012 INFO L225 Difference]: With dead ends: 323 [2020-07-21 23:21:57,013 INFO L226 Difference]: Without dead ends: 321 [2020-07-21 23:21:57,013 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 738 GetRequests, 625 SyntacticMatches, 72 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1547 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=788, Invalid=1018, Unknown=0, NotChecked=0, Total=1806 [2020-07-21 23:21:57,013 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 321 states. [2020-07-21 23:21:57,024 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 321 to 316. [2020-07-21 23:21:57,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 316 states. [2020-07-21 23:21:57,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 316 states to 316 states and 337 transitions. [2020-07-21 23:21:57,025 INFO L78 Accepts]: Start accepts. Automaton has 316 states and 337 transitions. Word has length 369 [2020-07-21 23:21:57,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:21:57,025 INFO L479 AbstractCegarLoop]: Abstraction has 316 states and 337 transitions. [2020-07-21 23:21:57,025 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-07-21 23:21:57,025 INFO L276 IsEmpty]: Start isEmpty. Operand 316 states and 337 transitions. [2020-07-21 23:21:57,028 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 386 [2020-07-21 23:21:57,028 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:21:57,028 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 38, 37, 37, 37, 37, 37, 37, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:21:57,228 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 57 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:21:57,229 INFO L427 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:21:57,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:21:57,230 INFO L82 PathProgramCache]: Analyzing trace with hash 1586365096, now seen corresponding path program 54 times [2020-07-21 23:21:57,230 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:21:57,230 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [575563413] [2020-07-21 23:21:57,231 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 58 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 58 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:21:57,384 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:21:57,384 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:21:57,388 INFO L263 TraceCheckSpWp]: Trace formula consists of 1032 conjuncts, 76 conjunts are in the unsatisfiable core [2020-07-21 23:21:57,392 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:22:01,731 INFO L134 CoverageAnalysis]: Checked inductivity of 6808 backedges. 2952 proven. 1332 refuted. 0 times theorem prover too weak. 2524 trivial. 0 not checked. [2020-07-21 23:22:01,731 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:22:07,278 INFO L134 CoverageAnalysis]: Checked inductivity of 6808 backedges. 2810 proven. 1332 refuted. 0 times theorem prover too weak. 2666 trivial. 0 not checked. [2020-07-21 23:22:07,278 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [575563413] [2020-07-21 23:22:07,278 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:22:07,279 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [76, 76] total 113 [2020-07-21 23:22:07,279 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1679974015] [2020-07-21 23:22:07,279 INFO L459 AbstractCegarLoop]: Interpolant automaton has 113 states [2020-07-21 23:22:07,280 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:22:07,280 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 113 interpolants. [2020-07-21 23:22:07,281 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2924, Invalid=9732, Unknown=0, NotChecked=0, Total=12656 [2020-07-21 23:22:07,281 INFO L87 Difference]: Start difference. First operand 316 states and 337 transitions. Second operand 113 states. [2020-07-21 23:22:13,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:22:13,112 INFO L93 Difference]: Finished difference Result 627 states and 759 transitions. [2020-07-21 23:22:13,113 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2020-07-21 23:22:13,113 INFO L78 Accepts]: Start accepts. Automaton has 113 states. Word has length 385 [2020-07-21 23:22:13,113 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:22:13,115 INFO L225 Difference]: With dead ends: 627 [2020-07-21 23:22:13,115 INFO L226 Difference]: Without dead ends: 466 [2020-07-21 23:22:13,117 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 806 GetRequests, 621 SyntacticMatches, 37 SemanticMatches, 148 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5958 ImplicationChecksByTransitivity, 11.8s TimeCoverageRelationStatistics Valid=5773, Invalid=16577, Unknown=0, NotChecked=0, Total=22350 [2020-07-21 23:22:13,117 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 466 states. [2020-07-21 23:22:13,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 466 to 318. [2020-07-21 23:22:13,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 318 states. [2020-07-21 23:22:13,132 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 318 states to 318 states and 339 transitions. [2020-07-21 23:22:13,132 INFO L78 Accepts]: Start accepts. Automaton has 318 states and 339 transitions. Word has length 385 [2020-07-21 23:22:13,132 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:22:13,133 INFO L479 AbstractCegarLoop]: Abstraction has 318 states and 339 transitions. [2020-07-21 23:22:13,133 INFO L480 AbstractCegarLoop]: Interpolant automaton has 113 states. [2020-07-21 23:22:13,133 INFO L276 IsEmpty]: Start isEmpty. Operand 318 states and 339 transitions. [2020-07-21 23:22:13,134 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 388 [2020-07-21 23:22:13,134 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:22:13,135 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 38, 38, 37, 37, 37, 37, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:22:13,335 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 58 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:22:13,336 INFO L427 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:22:13,336 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:22:13,336 INFO L82 PathProgramCache]: Analyzing trace with hash -468415411, now seen corresponding path program 55 times [2020-07-21 23:22:13,337 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:22:13,337 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [404432799] [2020-07-21 23:22:13,337 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 59 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 59 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:22:13,496 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:22:13,496 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:22:13,501 INFO L263 TraceCheckSpWp]: Trace formula consists of 1042 conjuncts, 78 conjunts are in the unsatisfiable core [2020-07-21 23:22:13,504 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:22:18,308 INFO L134 CoverageAnalysis]: Checked inductivity of 6882 backedges. 2812 proven. 1406 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2020-07-21 23:22:18,308 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:22:24,597 INFO L134 CoverageAnalysis]: Checked inductivity of 6882 backedges. 2812 proven. 1406 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2020-07-21 23:22:24,597 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [404432799] [2020-07-21 23:22:24,598 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:22:24,598 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [78, 78] total 116 [2020-07-21 23:22:24,598 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [294278022] [2020-07-21 23:22:24,599 INFO L459 AbstractCegarLoop]: Interpolant automaton has 116 states [2020-07-21 23:22:24,599 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:22:24,600 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 116 interpolants. [2020-07-21 23:22:24,600 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3079, Invalid=10261, Unknown=0, NotChecked=0, Total=13340 [2020-07-21 23:22:24,601 INFO L87 Difference]: Start difference. First operand 318 states and 339 transitions. Second operand 116 states. [2020-07-21 23:22:31,682 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:22:31,682 INFO L93 Difference]: Finished difference Result 631 states and 766 transitions. [2020-07-21 23:22:31,683 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2020-07-21 23:22:31,683 INFO L78 Accepts]: Start accepts. Automaton has 116 states. Word has length 387 [2020-07-21 23:22:31,683 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:22:31,685 INFO L225 Difference]: With dead ends: 631 [2020-07-21 23:22:31,685 INFO L226 Difference]: Without dead ends: 472 [2020-07-21 23:22:31,687 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 811 GetRequests, 621 SyntacticMatches, 38 SemanticMatches, 152 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6290 ImplicationChecksByTransitivity, 13.7s TimeCoverageRelationStatistics Valid=6081, Invalid=17481, Unknown=0, NotChecked=0, Total=23562 [2020-07-21 23:22:31,688 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 472 states. [2020-07-21 23:22:31,701 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 472 to 320. [2020-07-21 23:22:31,701 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 320 states. [2020-07-21 23:22:31,702 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 320 states to 320 states and 341 transitions. [2020-07-21 23:22:31,702 INFO L78 Accepts]: Start accepts. Automaton has 320 states and 341 transitions. Word has length 387 [2020-07-21 23:22:31,702 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:22:31,702 INFO L479 AbstractCegarLoop]: Abstraction has 320 states and 341 transitions. [2020-07-21 23:22:31,702 INFO L480 AbstractCegarLoop]: Interpolant automaton has 116 states. [2020-07-21 23:22:31,703 INFO L276 IsEmpty]: Start isEmpty. Operand 320 states and 341 transitions. [2020-07-21 23:22:31,705 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 390 [2020-07-21 23:22:31,705 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:22:31,706 INFO L422 BasicCegarLoop]: trace histogram [39, 38, 38, 38, 38, 37, 37, 37, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:22:31,935 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 59 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:22:31,936 INFO L427 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:22:31,936 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:22:31,937 INFO L82 PathProgramCache]: Analyzing trace with hash 572473522, now seen corresponding path program 56 times [2020-07-21 23:22:31,937 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:22:31,938 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1754592521] [2020-07-21 23:22:31,938 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 60 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 60 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:22:32,104 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:22:32,104 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:22:32,109 INFO L263 TraceCheckSpWp]: Trace formula consists of 1052 conjuncts, 79 conjunts are in the unsatisfiable core [2020-07-21 23:22:32,112 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:22:33,992 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 23:22:34,180 INFO L134 CoverageAnalysis]: Checked inductivity of 6958 backedges. 1556 proven. 2738 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2020-07-21 23:22:34,180 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:22:34,286 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 23:22:37,973 INFO L134 CoverageAnalysis]: Checked inductivity of 6958 backedges. 1556 proven. 2738 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2020-07-21 23:22:37,974 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1754592521] [2020-07-21 23:22:37,974 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:22:37,974 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43] total 44 [2020-07-21 23:22:37,974 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [230530477] [2020-07-21 23:22:37,975 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-07-21 23:22:37,975 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:22:37,976 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-07-21 23:22:37,976 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=865, Invalid=1027, Unknown=0, NotChecked=0, Total=1892 [2020-07-21 23:22:37,976 INFO L87 Difference]: Start difference. First operand 320 states and 341 transitions. Second operand 44 states. [2020-07-21 23:22:38,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:22:38,921 INFO L93 Difference]: Finished difference Result 339 states and 362 transitions. [2020-07-21 23:22:38,923 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-07-21 23:22:38,923 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 389 [2020-07-21 23:22:38,924 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:22:38,925 INFO L225 Difference]: With dead ends: 339 [2020-07-21 23:22:38,925 INFO L226 Difference]: Without dead ends: 337 [2020-07-21 23:22:38,926 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 778 GetRequests, 659 SyntacticMatches, 76 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1709 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=869, Invalid=1111, Unknown=0, NotChecked=0, Total=1980 [2020-07-21 23:22:38,926 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 337 states. [2020-07-21 23:22:38,938 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 337 to 332. [2020-07-21 23:22:38,938 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 332 states. [2020-07-21 23:22:38,939 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 332 states to 332 states and 354 transitions. [2020-07-21 23:22:38,939 INFO L78 Accepts]: Start accepts. Automaton has 332 states and 354 transitions. Word has length 389 [2020-07-21 23:22:38,939 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:22:38,939 INFO L479 AbstractCegarLoop]: Abstraction has 332 states and 354 transitions. [2020-07-21 23:22:38,939 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-07-21 23:22:38,939 INFO L276 IsEmpty]: Start isEmpty. Operand 332 states and 354 transitions. [2020-07-21 23:22:38,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 406 [2020-07-21 23:22:38,942 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:22:38,942 INFO L422 BasicCegarLoop]: trace histogram [40, 40, 40, 39, 39, 39, 39, 39, 39, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:22:39,144 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 60 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:22:39,144 INFO L427 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:22:39,145 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:22:39,145 INFO L82 PathProgramCache]: Analyzing trace with hash -73744748, now seen corresponding path program 57 times [2020-07-21 23:22:39,145 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:22:39,145 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [251553334] [2020-07-21 23:22:39,146 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 61 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 61 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:22:39,307 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:22:39,307 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:22:39,310 INFO L263 TraceCheckSpWp]: Trace formula consists of 1086 conjuncts, 80 conjunts are in the unsatisfiable core [2020-07-21 23:22:39,314 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:22:45,362 INFO L134 CoverageAnalysis]: Checked inductivity of 7566 backedges. 3268 proven. 1482 refuted. 0 times theorem prover too weak. 2816 trivial. 0 not checked. [2020-07-21 23:22:45,362 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:22:51,397 INFO L134 CoverageAnalysis]: Checked inductivity of 7566 backedges. 3118 proven. 1482 refuted. 0 times theorem prover too weak. 2966 trivial. 0 not checked. [2020-07-21 23:22:51,398 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [251553334] [2020-07-21 23:22:51,398 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:22:51,398 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [80, 80] total 119 [2020-07-21 23:22:51,398 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [60549213] [2020-07-21 23:22:51,399 INFO L459 AbstractCegarLoop]: Interpolant automaton has 119 states [2020-07-21 23:22:51,399 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:22:51,399 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 119 interpolants. [2020-07-21 23:22:51,400 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3238, Invalid=10804, Unknown=0, NotChecked=0, Total=14042 [2020-07-21 23:22:51,400 INFO L87 Difference]: Start difference. First operand 332 states and 354 transitions. Second operand 119 states. [2020-07-21 23:22:58,981 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:22:58,981 INFO L93 Difference]: Finished difference Result 659 states and 798 transitions. [2020-07-21 23:22:58,982 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2020-07-21 23:22:58,982 INFO L78 Accepts]: Start accepts. Automaton has 119 states. Word has length 405 [2020-07-21 23:22:58,982 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:22:58,984 INFO L225 Difference]: With dead ends: 659 [2020-07-21 23:22:58,984 INFO L226 Difference]: Without dead ends: 490 [2020-07-21 23:22:58,987 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 848 GetRequests, 653 SyntacticMatches, 39 SemanticMatches, 156 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6631 ImplicationChecksByTransitivity, 14.7s TimeCoverageRelationStatistics Valid=6397, Invalid=18409, Unknown=0, NotChecked=0, Total=24806 [2020-07-21 23:22:58,987 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 490 states. [2020-07-21 23:22:59,000 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 490 to 334. [2020-07-21 23:22:59,000 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 334 states. [2020-07-21 23:22:59,001 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 334 states to 334 states and 356 transitions. [2020-07-21 23:22:59,001 INFO L78 Accepts]: Start accepts. Automaton has 334 states and 356 transitions. Word has length 405 [2020-07-21 23:22:59,002 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:22:59,002 INFO L479 AbstractCegarLoop]: Abstraction has 334 states and 356 transitions. [2020-07-21 23:22:59,002 INFO L480 AbstractCegarLoop]: Interpolant automaton has 119 states. [2020-07-21 23:22:59,002 INFO L276 IsEmpty]: Start isEmpty. Operand 334 states and 356 transitions. [2020-07-21 23:22:59,004 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 408 [2020-07-21 23:22:59,004 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:22:59,004 INFO L422 BasicCegarLoop]: trace histogram [40, 40, 40, 40, 39, 39, 39, 39, 39, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:22:59,205 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 61 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:22:59,205 INFO L427 AbstractCegarLoop]: === Iteration 61 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:22:59,206 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:22:59,206 INFO L82 PathProgramCache]: Analyzing trace with hash 2082014137, now seen corresponding path program 58 times [2020-07-21 23:22:59,207 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:22:59,207 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1918556973] [2020-07-21 23:22:59,207 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 62 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 62 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:22:59,375 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:22:59,376 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:22:59,380 INFO L263 TraceCheckSpWp]: Trace formula consists of 1096 conjuncts, 82 conjunts are in the unsatisfiable core [2020-07-21 23:22:59,384 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:23:06,138 INFO L134 CoverageAnalysis]: Checked inductivity of 7644 backedges. 3120 proven. 1560 refuted. 0 times theorem prover too weak. 2964 trivial. 0 not checked. [2020-07-21 23:23:06,139 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:23:14,413 INFO L134 CoverageAnalysis]: Checked inductivity of 7644 backedges. 3120 proven. 1560 refuted. 0 times theorem prover too weak. 2964 trivial. 0 not checked. [2020-07-21 23:23:14,414 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1918556973] [2020-07-21 23:23:14,414 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:23:14,414 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [82, 82] total 122 [2020-07-21 23:23:14,414 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [954343411] [2020-07-21 23:23:14,415 INFO L459 AbstractCegarLoop]: Interpolant automaton has 122 states [2020-07-21 23:23:14,415 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:23:14,415 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 122 interpolants. [2020-07-21 23:23:14,416 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3401, Invalid=11361, Unknown=0, NotChecked=0, Total=14762 [2020-07-21 23:23:14,416 INFO L87 Difference]: Start difference. First operand 334 states and 356 transitions. Second operand 122 states. [2020-07-21 23:23:23,182 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:23:23,182 INFO L93 Difference]: Finished difference Result 663 states and 805 transitions. [2020-07-21 23:23:23,182 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2020-07-21 23:23:23,182 INFO L78 Accepts]: Start accepts. Automaton has 122 states. Word has length 407 [2020-07-21 23:23:23,183 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:23:23,185 INFO L225 Difference]: With dead ends: 663 [2020-07-21 23:23:23,185 INFO L226 Difference]: Without dead ends: 496 [2020-07-21 23:23:23,187 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 853 GetRequests, 653 SyntacticMatches, 40 SemanticMatches, 160 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6981 ImplicationChecksByTransitivity, 18.2s TimeCoverageRelationStatistics Valid=6721, Invalid=19361, Unknown=0, NotChecked=0, Total=26082 [2020-07-21 23:23:23,187 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 496 states. [2020-07-21 23:23:23,198 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 496 to 336. [2020-07-21 23:23:23,198 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 336 states. [2020-07-21 23:23:23,199 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 336 states to 336 states and 358 transitions. [2020-07-21 23:23:23,199 INFO L78 Accepts]: Start accepts. Automaton has 336 states and 358 transitions. Word has length 407 [2020-07-21 23:23:23,199 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:23:23,199 INFO L479 AbstractCegarLoop]: Abstraction has 336 states and 358 transitions. [2020-07-21 23:23:23,199 INFO L480 AbstractCegarLoop]: Interpolant automaton has 122 states. [2020-07-21 23:23:23,199 INFO L276 IsEmpty]: Start isEmpty. Operand 336 states and 358 transitions. [2020-07-21 23:23:23,201 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 410 [2020-07-21 23:23:23,201 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:23:23,201 INFO L422 BasicCegarLoop]: trace histogram [41, 40, 40, 40, 40, 39, 39, 39, 39, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:23:23,401 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 62 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:23:23,402 INFO L427 AbstractCegarLoop]: === Iteration 62 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:23:23,402 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:23:23,403 INFO L82 PathProgramCache]: Analyzing trace with hash -702901346, now seen corresponding path program 59 times [2020-07-21 23:23:23,403 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:23:23,403 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1259118596] [2020-07-21 23:23:23,404 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 63 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 63 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:23:23,570 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:23:23,570 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:23:23,574 INFO L263 TraceCheckSpWp]: Trace formula consists of 1106 conjuncts, 83 conjunts are in the unsatisfiable core [2020-07-21 23:23:23,578 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:23:25,426 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 23:23:25,601 INFO L134 CoverageAnalysis]: Checked inductivity of 7724 backedges. 1718 proven. 3042 refuted. 0 times theorem prover too weak. 2964 trivial. 0 not checked. [2020-07-21 23:23:25,602 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:23:25,729 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 23:23:30,317 INFO L134 CoverageAnalysis]: Checked inductivity of 7724 backedges. 1718 proven. 3042 refuted. 0 times theorem prover too weak. 2964 trivial. 0 not checked. [2020-07-21 23:23:30,317 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1259118596] [2020-07-21 23:23:30,318 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:23:30,318 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45] total 46 [2020-07-21 23:23:30,318 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [158242863] [2020-07-21 23:23:30,319 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-07-21 23:23:30,319 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:23:30,319 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-07-21 23:23:30,319 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=950, Invalid=1120, Unknown=0, NotChecked=0, Total=2070 [2020-07-21 23:23:30,319 INFO L87 Difference]: Start difference. First operand 336 states and 358 transitions. Second operand 46 states. [2020-07-21 23:23:31,545 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:23:31,545 INFO L93 Difference]: Finished difference Result 355 states and 379 transitions. [2020-07-21 23:23:31,548 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-07-21 23:23:31,548 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 409 [2020-07-21 23:23:31,549 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:23:31,555 INFO L225 Difference]: With dead ends: 355 [2020-07-21 23:23:31,555 INFO L226 Difference]: Without dead ends: 353 [2020-07-21 23:23:31,556 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 818 GetRequests, 693 SyntacticMatches, 80 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1879 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=954, Invalid=1208, Unknown=0, NotChecked=0, Total=2162 [2020-07-21 23:23:31,557 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 353 states. [2020-07-21 23:23:31,574 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 353 to 348. [2020-07-21 23:23:31,574 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 348 states. [2020-07-21 23:23:31,575 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 348 states to 348 states and 371 transitions. [2020-07-21 23:23:31,576 INFO L78 Accepts]: Start accepts. Automaton has 348 states and 371 transitions. Word has length 409 [2020-07-21 23:23:31,576 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:23:31,576 INFO L479 AbstractCegarLoop]: Abstraction has 348 states and 371 transitions. [2020-07-21 23:23:31,576 INFO L480 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-07-21 23:23:31,576 INFO L276 IsEmpty]: Start isEmpty. Operand 348 states and 371 transitions. [2020-07-21 23:23:31,578 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 426 [2020-07-21 23:23:31,578 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:23:31,578 INFO L422 BasicCegarLoop]: trace histogram [42, 42, 42, 41, 41, 41, 41, 41, 41, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:23:31,779 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 63 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:23:31,779 INFO L427 AbstractCegarLoop]: === Iteration 63 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:23:31,780 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:23:31,780 INFO L82 PathProgramCache]: Analyzing trace with hash 524990848, now seen corresponding path program 60 times [2020-07-21 23:23:31,781 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:23:31,781 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1449993945] [2020-07-21 23:23:31,781 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 64 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 64 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:23:31,961 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:23:31,961 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:23:31,966 INFO L263 TraceCheckSpWp]: Trace formula consists of 1140 conjuncts, 84 conjunts are in the unsatisfiable core [2020-07-21 23:23:31,971 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:23:38,963 INFO L134 CoverageAnalysis]: Checked inductivity of 8364 backedges. 3600 proven. 1640 refuted. 0 times theorem prover too weak. 3124 trivial. 0 not checked. [2020-07-21 23:23:38,963 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:23:48,305 INFO L134 CoverageAnalysis]: Checked inductivity of 8364 backedges. 3442 proven. 1640 refuted. 0 times theorem prover too weak. 3282 trivial. 0 not checked. [2020-07-21 23:23:48,306 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1449993945] [2020-07-21 23:23:48,306 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:23:48,306 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [84, 84] total 125 [2020-07-21 23:23:48,306 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1885533065] [2020-07-21 23:23:48,307 INFO L459 AbstractCegarLoop]: Interpolant automaton has 125 states [2020-07-21 23:23:48,307 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:23:48,308 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 125 interpolants. [2020-07-21 23:23:48,309 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3568, Invalid=11932, Unknown=0, NotChecked=0, Total=15500 [2020-07-21 23:23:48,309 INFO L87 Difference]: Start difference. First operand 348 states and 371 transitions. Second operand 125 states. [2020-07-21 23:23:59,290 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:23:59,290 INFO L93 Difference]: Finished difference Result 691 states and 837 transitions. [2020-07-21 23:23:59,290 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2020-07-21 23:23:59,290 INFO L78 Accepts]: Start accepts. Automaton has 125 states. Word has length 425 [2020-07-21 23:23:59,291 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:23:59,293 INFO L225 Difference]: With dead ends: 691 [2020-07-21 23:23:59,293 INFO L226 Difference]: Without dead ends: 514 [2020-07-21 23:23:59,295 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 890 GetRequests, 685 SyntacticMatches, 41 SemanticMatches, 164 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7340 ImplicationChecksByTransitivity, 20.1s TimeCoverageRelationStatistics Valid=7053, Invalid=20337, Unknown=0, NotChecked=0, Total=27390 [2020-07-21 23:23:59,296 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 514 states. [2020-07-21 23:23:59,309 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 514 to 350. [2020-07-21 23:23:59,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 350 states. [2020-07-21 23:23:59,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 350 states to 350 states and 373 transitions. [2020-07-21 23:23:59,310 INFO L78 Accepts]: Start accepts. Automaton has 350 states and 373 transitions. Word has length 425 [2020-07-21 23:23:59,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:23:59,310 INFO L479 AbstractCegarLoop]: Abstraction has 350 states and 373 transitions. [2020-07-21 23:23:59,310 INFO L480 AbstractCegarLoop]: Interpolant automaton has 125 states. [2020-07-21 23:23:59,310 INFO L276 IsEmpty]: Start isEmpty. Operand 350 states and 373 transitions. [2020-07-21 23:23:59,312 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 428 [2020-07-21 23:23:59,313 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:23:59,313 INFO L422 BasicCegarLoop]: trace histogram [42, 42, 42, 42, 41, 41, 41, 41, 41, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:23:59,516 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 64 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:23:59,517 INFO L427 AbstractCegarLoop]: === Iteration 64 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:23:59,517 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:23:59,518 INFO L82 PathProgramCache]: Analyzing trace with hash -2129659355, now seen corresponding path program 61 times [2020-07-21 23:23:59,518 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:23:59,518 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [160270590] [2020-07-21 23:23:59,519 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 65 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 65 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:23:59,702 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:23:59,703 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:23:59,708 INFO L263 TraceCheckSpWp]: Trace formula consists of 1150 conjuncts, 86 conjunts are in the unsatisfiable core [2020-07-21 23:23:59,714 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:24:08,470 INFO L134 CoverageAnalysis]: Checked inductivity of 8446 backedges. 3444 proven. 1722 refuted. 0 times theorem prover too weak. 3280 trivial. 0 not checked. [2020-07-21 23:24:08,470 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:24:18,056 INFO L134 CoverageAnalysis]: Checked inductivity of 8446 backedges. 3444 proven. 1722 refuted. 0 times theorem prover too weak. 3280 trivial. 0 not checked. [2020-07-21 23:24:18,057 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [160270590] [2020-07-21 23:24:18,057 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:24:18,058 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [86, 86] total 128 [2020-07-21 23:24:18,058 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1395201076] [2020-07-21 23:24:18,059 INFO L459 AbstractCegarLoop]: Interpolant automaton has 128 states [2020-07-21 23:24:18,059 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:24:18,061 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 128 interpolants. [2020-07-21 23:24:18,062 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3739, Invalid=12517, Unknown=0, NotChecked=0, Total=16256 [2020-07-21 23:24:18,062 INFO L87 Difference]: Start difference. First operand 350 states and 373 transitions. Second operand 128 states. [2020-07-21 23:24:29,670 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:24:29,670 INFO L93 Difference]: Finished difference Result 695 states and 844 transitions. [2020-07-21 23:24:29,670 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2020-07-21 23:24:29,670 INFO L78 Accepts]: Start accepts. Automaton has 128 states. Word has length 427 [2020-07-21 23:24:29,671 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:24:29,673 INFO L225 Difference]: With dead ends: 695 [2020-07-21 23:24:29,673 INFO L226 Difference]: Without dead ends: 520 [2020-07-21 23:24:29,676 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 895 GetRequests, 685 SyntacticMatches, 42 SemanticMatches, 168 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7708 ImplicationChecksByTransitivity, 22.5s TimeCoverageRelationStatistics Valid=7393, Invalid=21337, Unknown=0, NotChecked=0, Total=28730 [2020-07-21 23:24:29,677 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 520 states. [2020-07-21 23:24:29,691 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 520 to 352. [2020-07-21 23:24:29,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 352 states. [2020-07-21 23:24:29,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 352 states to 352 states and 375 transitions. [2020-07-21 23:24:29,693 INFO L78 Accepts]: Start accepts. Automaton has 352 states and 375 transitions. Word has length 427 [2020-07-21 23:24:29,694 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:24:29,694 INFO L479 AbstractCegarLoop]: Abstraction has 352 states and 375 transitions. [2020-07-21 23:24:29,694 INFO L480 AbstractCegarLoop]: Interpolant automaton has 128 states. [2020-07-21 23:24:29,695 INFO L276 IsEmpty]: Start isEmpty. Operand 352 states and 375 transitions. [2020-07-21 23:24:29,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 430 [2020-07-21 23:24:29,698 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:24:29,699 INFO L422 BasicCegarLoop]: trace histogram [43, 42, 42, 42, 42, 41, 41, 41, 41, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:24:29,914 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 65 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:24:29,915 INFO L427 AbstractCegarLoop]: === Iteration 65 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:24:29,915 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:24:29,916 INFO L82 PathProgramCache]: Analyzing trace with hash -2037930614, now seen corresponding path program 62 times [2020-07-21 23:24:29,916 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:24:29,917 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1905601097] [2020-07-21 23:24:29,917 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 66 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 66 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:24:30,119 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:24:30,119 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:24:30,126 INFO L263 TraceCheckSpWp]: Trace formula consists of 1160 conjuncts, 87 conjunts are in the unsatisfiable core [2020-07-21 23:24:30,130 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:24:32,384 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 23:24:32,606 INFO L134 CoverageAnalysis]: Checked inductivity of 8530 backedges. 1888 proven. 3362 refuted. 0 times theorem prover too weak. 3280 trivial. 0 not checked. [2020-07-21 23:24:32,606 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:24:32,759 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 23:24:39,042 INFO L134 CoverageAnalysis]: Checked inductivity of 8530 backedges. 1888 proven. 3362 refuted. 0 times theorem prover too weak. 3280 trivial. 0 not checked. [2020-07-21 23:24:39,043 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1905601097] [2020-07-21 23:24:39,043 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:24:39,043 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47] total 48 [2020-07-21 23:24:39,044 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [663502006] [2020-07-21 23:24:39,044 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-07-21 23:24:39,044 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:24:39,045 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-07-21 23:24:39,045 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1039, Invalid=1217, Unknown=0, NotChecked=0, Total=2256 [2020-07-21 23:24:39,045 INFO L87 Difference]: Start difference. First operand 352 states and 375 transitions. Second operand 48 states. [2020-07-21 23:24:40,671 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:24:40,671 INFO L93 Difference]: Finished difference Result 371 states and 396 transitions. [2020-07-21 23:24:40,675 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-07-21 23:24:40,675 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 429 [2020-07-21 23:24:40,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:24:40,678 INFO L225 Difference]: With dead ends: 371 [2020-07-21 23:24:40,678 INFO L226 Difference]: Without dead ends: 369 [2020-07-21 23:24:40,679 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 858 GetRequests, 727 SyntacticMatches, 84 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2057 ImplicationChecksByTransitivity, 8.1s TimeCoverageRelationStatistics Valid=1043, Invalid=1309, Unknown=0, NotChecked=0, Total=2352 [2020-07-21 23:24:40,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 369 states. [2020-07-21 23:24:40,692 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 369 to 364. [2020-07-21 23:24:40,693 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 364 states. [2020-07-21 23:24:40,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 364 states to 364 states and 388 transitions. [2020-07-21 23:24:40,694 INFO L78 Accepts]: Start accepts. Automaton has 364 states and 388 transitions. Word has length 429 [2020-07-21 23:24:40,694 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:24:40,694 INFO L479 AbstractCegarLoop]: Abstraction has 364 states and 388 transitions. [2020-07-21 23:24:40,694 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-07-21 23:24:40,694 INFO L276 IsEmpty]: Start isEmpty. Operand 364 states and 388 transitions. [2020-07-21 23:24:40,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 446 [2020-07-21 23:24:40,697 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:24:40,697 INFO L422 BasicCegarLoop]: trace histogram [44, 44, 44, 43, 43, 43, 43, 43, 43, 42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:24:40,897 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 66 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:24:40,898 INFO L427 AbstractCegarLoop]: === Iteration 66 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:24:40,898 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:24:40,899 INFO L82 PathProgramCache]: Analyzing trace with hash -99716244, now seen corresponding path program 63 times [2020-07-21 23:24:40,899 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:24:40,899 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [778334637] [2020-07-21 23:24:40,900 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 67 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 67 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:24:41,095 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:24:41,095 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:24:41,101 INFO L263 TraceCheckSpWp]: Trace formula consists of 1194 conjuncts, 88 conjunts are in the unsatisfiable core [2020-07-21 23:24:41,106 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:24:50,965 INFO L134 CoverageAnalysis]: Checked inductivity of 9202 backedges. 3948 proven. 1806 refuted. 0 times theorem prover too weak. 3448 trivial. 0 not checked. [2020-07-21 23:24:50,965 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:25:02,356 INFO L134 CoverageAnalysis]: Checked inductivity of 9202 backedges. 3782 proven. 1806 refuted. 0 times theorem prover too weak. 3614 trivial. 0 not checked. [2020-07-21 23:25:02,357 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [778334637] [2020-07-21 23:25:02,357 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:25:02,357 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [88, 88] total 131 [2020-07-21 23:25:02,357 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1165026562] [2020-07-21 23:25:02,358 INFO L459 AbstractCegarLoop]: Interpolant automaton has 131 states [2020-07-21 23:25:02,359 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:25:02,359 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 131 interpolants. [2020-07-21 23:25:02,360 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3914, Invalid=13116, Unknown=0, NotChecked=0, Total=17030 [2020-07-21 23:25:02,361 INFO L87 Difference]: Start difference. First operand 364 states and 388 transitions. Second operand 131 states. [2020-07-21 23:25:16,782 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:25:16,783 INFO L93 Difference]: Finished difference Result 723 states and 876 transitions. [2020-07-21 23:25:16,783 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 88 states. [2020-07-21 23:25:16,783 INFO L78 Accepts]: Start accepts. Automaton has 131 states. Word has length 445 [2020-07-21 23:25:16,784 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:25:16,786 INFO L225 Difference]: With dead ends: 723 [2020-07-21 23:25:16,786 INFO L226 Difference]: Without dead ends: 538 [2020-07-21 23:25:16,789 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 932 GetRequests, 717 SyntacticMatches, 43 SemanticMatches, 172 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8085 ImplicationChecksByTransitivity, 26.6s TimeCoverageRelationStatistics Valid=7741, Invalid=22361, Unknown=0, NotChecked=0, Total=30102 [2020-07-21 23:25:16,790 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 538 states. [2020-07-21 23:25:16,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 538 to 366. [2020-07-21 23:25:16,810 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 366 states. [2020-07-21 23:25:16,811 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 366 states to 366 states and 390 transitions. [2020-07-21 23:25:16,811 INFO L78 Accepts]: Start accepts. Automaton has 366 states and 390 transitions. Word has length 445 [2020-07-21 23:25:16,812 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:25:16,812 INFO L479 AbstractCegarLoop]: Abstraction has 366 states and 390 transitions. [2020-07-21 23:25:16,812 INFO L480 AbstractCegarLoop]: Interpolant automaton has 131 states. [2020-07-21 23:25:16,812 INFO L276 IsEmpty]: Start isEmpty. Operand 366 states and 390 transitions. [2020-07-21 23:25:16,814 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 448 [2020-07-21 23:25:16,814 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:25:16,815 INFO L422 BasicCegarLoop]: trace histogram [44, 44, 44, 44, 43, 43, 43, 43, 43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:25:17,015 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 67 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:25:17,016 INFO L427 AbstractCegarLoop]: === Iteration 67 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:25:17,016 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:25:17,017 INFO L82 PathProgramCache]: Analyzing trace with hash 592048017, now seen corresponding path program 64 times [2020-07-21 23:25:17,017 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:25:17,017 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [713368786] [2020-07-21 23:25:17,018 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 68 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 68 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:25:17,252 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:25:17,252 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:25:17,262 INFO L263 TraceCheckSpWp]: Trace formula consists of 1204 conjuncts, 90 conjunts are in the unsatisfiable core [2020-07-21 23:25:17,270 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:25:29,693 INFO L134 CoverageAnalysis]: Checked inductivity of 9288 backedges. 3784 proven. 1892 refuted. 0 times theorem prover too weak. 3612 trivial. 0 not checked. [2020-07-21 23:25:29,693 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:25:43,803 INFO L134 CoverageAnalysis]: Checked inductivity of 9288 backedges. 3784 proven. 1892 refuted. 0 times theorem prover too weak. 3612 trivial. 0 not checked. [2020-07-21 23:25:43,804 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [713368786] [2020-07-21 23:25:43,804 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:25:43,804 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [90, 90] total 134 [2020-07-21 23:25:43,804 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1702644888] [2020-07-21 23:25:43,805 INFO L459 AbstractCegarLoop]: Interpolant automaton has 134 states [2020-07-21 23:25:43,805 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:25:43,806 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 134 interpolants. [2020-07-21 23:25:43,807 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4093, Invalid=13729, Unknown=0, NotChecked=0, Total=17822 [2020-07-21 23:25:43,807 INFO L87 Difference]: Start difference. First operand 366 states and 390 transitions. Second operand 134 states. [2020-07-21 23:26:01,032 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:26:01,033 INFO L93 Difference]: Finished difference Result 727 states and 883 transitions. [2020-07-21 23:26:01,033 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 90 states. [2020-07-21 23:26:01,033 INFO L78 Accepts]: Start accepts. Automaton has 134 states. Word has length 447 [2020-07-21 23:26:01,034 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:26:01,036 INFO L225 Difference]: With dead ends: 727 [2020-07-21 23:26:01,036 INFO L226 Difference]: Without dead ends: 544 [2020-07-21 23:26:01,039 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 937 GetRequests, 717 SyntacticMatches, 44 SemanticMatches, 176 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8471 ImplicationChecksByTransitivity, 32.4s TimeCoverageRelationStatistics Valid=8097, Invalid=23409, Unknown=0, NotChecked=0, Total=31506 [2020-07-21 23:26:01,041 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 544 states. [2020-07-21 23:26:01,056 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 544 to 368. [2020-07-21 23:26:01,057 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 368 states. [2020-07-21 23:26:01,058 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 368 states to 368 states and 392 transitions. [2020-07-21 23:26:01,058 INFO L78 Accepts]: Start accepts. Automaton has 368 states and 392 transitions. Word has length 447 [2020-07-21 23:26:01,058 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:26:01,058 INFO L479 AbstractCegarLoop]: Abstraction has 368 states and 392 transitions. [2020-07-21 23:26:01,058 INFO L480 AbstractCegarLoop]: Interpolant automaton has 134 states. [2020-07-21 23:26:01,058 INFO L276 IsEmpty]: Start isEmpty. Operand 368 states and 392 transitions. [2020-07-21 23:26:01,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 450 [2020-07-21 23:26:01,061 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:26:01,061 INFO L422 BasicCegarLoop]: trace histogram [45, 44, 44, 44, 44, 43, 43, 43, 43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:26:01,262 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 68 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:26:01,263 INFO L427 AbstractCegarLoop]: === Iteration 68 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:26:01,263 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:26:01,264 INFO L82 PathProgramCache]: Analyzing trace with hash -342428042, now seen corresponding path program 65 times [2020-07-21 23:26:01,264 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:26:01,264 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1421515077] [2020-07-21 23:26:01,265 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 69 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 69 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:26:01,482 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:26:01,482 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:26:01,490 INFO L263 TraceCheckSpWp]: Trace formula consists of 1214 conjuncts, 91 conjunts are in the unsatisfiable core [2020-07-21 23:26:01,495 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:26:06,215 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 23:26:06,548 INFO L134 CoverageAnalysis]: Checked inductivity of 9376 backedges. 2066 proven. 3698 refuted. 0 times theorem prover too weak. 3612 trivial. 0 not checked. [2020-07-21 23:26:06,548 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:26:06,766 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 23:26:16,327 INFO L134 CoverageAnalysis]: Checked inductivity of 9376 backedges. 2066 proven. 3698 refuted. 0 times theorem prover too weak. 3612 trivial. 0 not checked. [2020-07-21 23:26:16,327 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1421515077] [2020-07-21 23:26:16,328 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:26:16,328 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49] total 50 [2020-07-21 23:26:16,328 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2114789153] [2020-07-21 23:26:16,329 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-07-21 23:26:16,329 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:26:16,329 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-07-21 23:26:16,330 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1132, Invalid=1318, Unknown=0, NotChecked=0, Total=2450 [2020-07-21 23:26:16,330 INFO L87 Difference]: Start difference. First operand 368 states and 392 transitions. Second operand 50 states. [2020-07-21 23:26:18,889 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:26:18,890 INFO L93 Difference]: Finished difference Result 387 states and 413 transitions. [2020-07-21 23:26:18,895 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2020-07-21 23:26:18,895 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 449 [2020-07-21 23:26:18,896 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:26:18,898 INFO L225 Difference]: With dead ends: 387 [2020-07-21 23:26:18,899 INFO L226 Difference]: Without dead ends: 385 [2020-07-21 23:26:18,900 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 898 GetRequests, 761 SyntacticMatches, 88 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2243 ImplicationChecksByTransitivity, 13.6s TimeCoverageRelationStatistics Valid=1136, Invalid=1414, Unknown=0, NotChecked=0, Total=2550 [2020-07-21 23:26:18,900 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 385 states. [2020-07-21 23:26:18,916 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 385 to 380. [2020-07-21 23:26:18,916 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 380 states. [2020-07-21 23:26:18,917 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 380 states to 380 states and 405 transitions. [2020-07-21 23:26:18,917 INFO L78 Accepts]: Start accepts. Automaton has 380 states and 405 transitions. Word has length 449 [2020-07-21 23:26:18,917 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:26:18,917 INFO L479 AbstractCegarLoop]: Abstraction has 380 states and 405 transitions. [2020-07-21 23:26:18,918 INFO L480 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-07-21 23:26:18,918 INFO L276 IsEmpty]: Start isEmpty. Operand 380 states and 405 transitions. [2020-07-21 23:26:18,920 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 466 [2020-07-21 23:26:18,921 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:26:18,921 INFO L422 BasicCegarLoop]: trace histogram [46, 46, 46, 45, 45, 45, 45, 45, 45, 44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:26:19,121 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 69 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:26:19,122 INFO L427 AbstractCegarLoop]: === Iteration 69 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:26:19,122 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:26:19,123 INFO L82 PathProgramCache]: Analyzing trace with hash -753505192, now seen corresponding path program 66 times [2020-07-21 23:26:19,123 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:26:19,123 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1968412445] [2020-07-21 23:26:19,124 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 70 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 70 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:26:19,343 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:26:19,344 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:26:19,352 INFO L263 TraceCheckSpWp]: Trace formula consists of 1248 conjuncts, 92 conjunts are in the unsatisfiable core [2020-07-21 23:26:19,358 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:26:34,518 INFO L134 CoverageAnalysis]: Checked inductivity of 10080 backedges. 4312 proven. 1980 refuted. 0 times theorem prover too weak. 3788 trivial. 0 not checked. [2020-07-21 23:26:34,519 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:26:51,478 INFO L134 CoverageAnalysis]: Checked inductivity of 10080 backedges. 4138 proven. 1980 refuted. 0 times theorem prover too weak. 3962 trivial. 0 not checked. [2020-07-21 23:26:51,479 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1968412445] [2020-07-21 23:26:51,479 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:26:51,479 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [92, 92] total 137 [2020-07-21 23:26:51,479 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [626247910] [2020-07-21 23:26:51,480 INFO L459 AbstractCegarLoop]: Interpolant automaton has 137 states [2020-07-21 23:26:51,480 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:26:51,481 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 137 interpolants. [2020-07-21 23:26:51,482 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4276, Invalid=14356, Unknown=0, NotChecked=0, Total=18632 [2020-07-21 23:26:51,483 INFO L87 Difference]: Start difference. First operand 380 states and 405 transitions. Second operand 137 states. [2020-07-21 23:27:08,950 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:27:08,951 INFO L93 Difference]: Finished difference Result 755 states and 915 transitions. [2020-07-21 23:27:08,951 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 92 states. [2020-07-21 23:27:08,951 INFO L78 Accepts]: Start accepts. Automaton has 137 states. Word has length 465 [2020-07-21 23:27:08,952 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:27:08,955 INFO L225 Difference]: With dead ends: 755 [2020-07-21 23:27:08,955 INFO L226 Difference]: Without dead ends: 562 [2020-07-21 23:27:08,958 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 974 GetRequests, 749 SyntacticMatches, 45 SemanticMatches, 180 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8866 ImplicationChecksByTransitivity, 38.5s TimeCoverageRelationStatistics Valid=8461, Invalid=24481, Unknown=0, NotChecked=0, Total=32942 [2020-07-21 23:27:08,959 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 562 states. [2020-07-21 23:27:08,976 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 562 to 382. [2020-07-21 23:27:08,976 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 382 states. [2020-07-21 23:27:08,978 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 382 states to 382 states and 407 transitions. [2020-07-21 23:27:08,979 INFO L78 Accepts]: Start accepts. Automaton has 382 states and 407 transitions. Word has length 465 [2020-07-21 23:27:08,979 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:27:08,979 INFO L479 AbstractCegarLoop]: Abstraction has 382 states and 407 transitions. [2020-07-21 23:27:08,979 INFO L480 AbstractCegarLoop]: Interpolant automaton has 137 states. [2020-07-21 23:27:08,980 INFO L276 IsEmpty]: Start isEmpty. Operand 382 states and 407 transitions. [2020-07-21 23:27:08,984 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 468 [2020-07-21 23:27:08,985 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:27:08,985 INFO L422 BasicCegarLoop]: trace histogram [46, 46, 46, 46, 45, 45, 45, 45, 45, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:27:09,199 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 70 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:27:09,200 INFO L427 AbstractCegarLoop]: === Iteration 70 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:27:09,201 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:27:09,201 INFO L82 PathProgramCache]: Analyzing trace with hash -103324675, now seen corresponding path program 67 times [2020-07-21 23:27:09,202 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:27:09,202 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1523424920] [2020-07-21 23:27:09,202 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 71 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 71 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:27:09,432 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:27:09,432 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:27:09,441 INFO L263 TraceCheckSpWp]: Trace formula consists of 1258 conjuncts, 94 conjunts are in the unsatisfiable core [2020-07-21 23:27:09,447 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:27:26,215 INFO L134 CoverageAnalysis]: Checked inductivity of 10170 backedges. 4140 proven. 2070 refuted. 0 times theorem prover too weak. 3960 trivial. 0 not checked. [2020-07-21 23:27:26,216 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:27:47,550 INFO L134 CoverageAnalysis]: Checked inductivity of 10170 backedges. 4140 proven. 2070 refuted. 0 times theorem prover too weak. 3960 trivial. 0 not checked. [2020-07-21 23:27:47,550 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1523424920] [2020-07-21 23:27:47,550 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:27:47,551 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [94, 94] total 140 [2020-07-21 23:27:47,551 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [385861432] [2020-07-21 23:27:47,552 INFO L459 AbstractCegarLoop]: Interpolant automaton has 140 states [2020-07-21 23:27:47,552 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:27:47,553 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 140 interpolants. [2020-07-21 23:27:47,554 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4463, Invalid=14997, Unknown=0, NotChecked=0, Total=19460 [2020-07-21 23:27:47,554 INFO L87 Difference]: Start difference. First operand 382 states and 407 transitions. Second operand 140 states. [2020-07-21 23:28:10,746 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:28:10,746 INFO L93 Difference]: Finished difference Result 759 states and 922 transitions. [2020-07-21 23:28:10,746 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2020-07-21 23:28:10,747 INFO L78 Accepts]: Start accepts. Automaton has 140 states. Word has length 467 [2020-07-21 23:28:10,747 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:28:10,750 INFO L225 Difference]: With dead ends: 759 [2020-07-21 23:28:10,751 INFO L226 Difference]: Without dead ends: 568 [2020-07-21 23:28:10,754 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 979 GetRequests, 749 SyntacticMatches, 46 SemanticMatches, 184 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9270 ImplicationChecksByTransitivity, 46.9s TimeCoverageRelationStatistics Valid=8833, Invalid=25577, Unknown=0, NotChecked=0, Total=34410 [2020-07-21 23:28:10,755 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 568 states. [2020-07-21 23:28:10,773 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 568 to 384. [2020-07-21 23:28:10,773 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 384 states. [2020-07-21 23:28:10,774 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 384 states to 384 states and 409 transitions. [2020-07-21 23:28:10,775 INFO L78 Accepts]: Start accepts. Automaton has 384 states and 409 transitions. Word has length 467 [2020-07-21 23:28:10,775 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:28:10,775 INFO L479 AbstractCegarLoop]: Abstraction has 384 states and 409 transitions. [2020-07-21 23:28:10,775 INFO L480 AbstractCegarLoop]: Interpolant automaton has 140 states. [2020-07-21 23:28:10,775 INFO L276 IsEmpty]: Start isEmpty. Operand 384 states and 409 transitions. [2020-07-21 23:28:10,777 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 470 [2020-07-21 23:28:10,778 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:28:10,778 INFO L422 BasicCegarLoop]: trace histogram [47, 46, 46, 46, 46, 45, 45, 45, 45, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:28:10,979 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 71 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:28:10,979 INFO L427 AbstractCegarLoop]: === Iteration 71 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:28:10,980 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:28:10,980 INFO L82 PathProgramCache]: Analyzing trace with hash 1949894242, now seen corresponding path program 68 times [2020-07-21 23:28:10,981 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:28:10,981 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1269674349] [2020-07-21 23:28:10,981 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 72 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 72 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:28:11,213 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:28:11,213 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:28:11,223 INFO L263 TraceCheckSpWp]: Trace formula consists of 1268 conjuncts, 95 conjunts are in the unsatisfiable core [2020-07-21 23:28:11,231 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:28:17,258 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 23:28:17,707 INFO L134 CoverageAnalysis]: Checked inductivity of 10262 backedges. 2252 proven. 4050 refuted. 0 times theorem prover too weak. 3960 trivial. 0 not checked. [2020-07-21 23:28:17,708 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:28:17,999 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 23:28:30,155 INFO L134 CoverageAnalysis]: Checked inductivity of 10262 backedges. 2252 proven. 4050 refuted. 0 times theorem prover too weak. 3960 trivial. 0 not checked. [2020-07-21 23:28:30,156 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1269674349] [2020-07-21 23:28:30,156 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:28:30,156 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51] total 52 [2020-07-21 23:28:30,157 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [444809971] [2020-07-21 23:28:30,157 INFO L459 AbstractCegarLoop]: Interpolant automaton has 52 states [2020-07-21 23:28:30,157 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:28:30,158 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2020-07-21 23:28:30,158 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1229, Invalid=1423, Unknown=0, NotChecked=0, Total=2652 [2020-07-21 23:28:30,158 INFO L87 Difference]: Start difference. First operand 384 states and 409 transitions. Second operand 52 states. [2020-07-21 23:28:32,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:28:32,634 INFO L93 Difference]: Finished difference Result 403 states and 430 transitions. [2020-07-21 23:28:32,641 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2020-07-21 23:28:32,641 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 469 [2020-07-21 23:28:32,642 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:28:32,644 INFO L225 Difference]: With dead ends: 403 [2020-07-21 23:28:32,645 INFO L226 Difference]: Without dead ends: 401 [2020-07-21 23:28:32,646 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 938 GetRequests, 795 SyntacticMatches, 92 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2437 ImplicationChecksByTransitivity, 17.3s TimeCoverageRelationStatistics Valid=1233, Invalid=1523, Unknown=0, NotChecked=0, Total=2756 [2020-07-21 23:28:32,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 401 states. [2020-07-21 23:28:32,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 401 to 396. [2020-07-21 23:28:32,675 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 396 states. [2020-07-21 23:28:32,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 396 states to 396 states and 422 transitions. [2020-07-21 23:28:32,677 INFO L78 Accepts]: Start accepts. Automaton has 396 states and 422 transitions. Word has length 469 [2020-07-21 23:28:32,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:28:32,678 INFO L479 AbstractCegarLoop]: Abstraction has 396 states and 422 transitions. [2020-07-21 23:28:32,678 INFO L480 AbstractCegarLoop]: Interpolant automaton has 52 states. [2020-07-21 23:28:32,678 INFO L276 IsEmpty]: Start isEmpty. Operand 396 states and 422 transitions. [2020-07-21 23:28:32,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 486 [2020-07-21 23:28:32,683 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:28:32,684 INFO L422 BasicCegarLoop]: trace histogram [48, 48, 48, 47, 47, 47, 47, 47, 47, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:28:32,898 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 72 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:28:32,899 INFO L427 AbstractCegarLoop]: === Iteration 72 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:28:32,899 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:28:32,900 INFO L82 PathProgramCache]: Analyzing trace with hash 676537412, now seen corresponding path program 69 times [2020-07-21 23:28:32,901 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:28:32,901 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1860093984] [2020-07-21 23:28:32,904 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 73 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 73 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:28:33,242 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:28:33,242 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:28:33,253 INFO L263 TraceCheckSpWp]: Trace formula consists of 1302 conjuncts, 96 conjunts are in the unsatisfiable core [2020-07-21 23:28:33,263 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:28:53,235 INFO L134 CoverageAnalysis]: Checked inductivity of 10998 backedges. 4692 proven. 2162 refuted. 0 times theorem prover too weak. 4144 trivial. 0 not checked. [2020-07-21 23:28:53,235 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:29:16,143 INFO L134 CoverageAnalysis]: Checked inductivity of 10998 backedges. 4510 proven. 2162 refuted. 0 times theorem prover too weak. 4326 trivial. 0 not checked. [2020-07-21 23:29:16,144 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1860093984] [2020-07-21 23:29:16,144 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:29:16,144 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [96, 96] total 143 [2020-07-21 23:29:16,145 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1811334053] [2020-07-21 23:29:16,146 INFO L459 AbstractCegarLoop]: Interpolant automaton has 143 states [2020-07-21 23:29:16,146 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:29:16,147 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 143 interpolants. [2020-07-21 23:29:16,149 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4654, Invalid=15652, Unknown=0, NotChecked=0, Total=20306 [2020-07-21 23:29:16,150 INFO L87 Difference]: Start difference. First operand 396 states and 422 transitions. Second operand 143 states. [2020-07-21 23:29:43,044 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:29:43,045 INFO L93 Difference]: Finished difference Result 787 states and 954 transitions. [2020-07-21 23:29:43,045 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2020-07-21 23:29:43,045 INFO L78 Accepts]: Start accepts. Automaton has 143 states. Word has length 485 [2020-07-21 23:29:43,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:29:43,049 INFO L225 Difference]: With dead ends: 787 [2020-07-21 23:29:43,049 INFO L226 Difference]: Without dead ends: 586 [2020-07-21 23:29:43,053 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1016 GetRequests, 781 SyntacticMatches, 47 SemanticMatches, 188 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9683 ImplicationChecksByTransitivity, 53.1s TimeCoverageRelationStatistics Valid=9213, Invalid=26697, Unknown=0, NotChecked=0, Total=35910 [2020-07-21 23:29:43,054 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 586 states. [2020-07-21 23:29:43,074 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 586 to 398. [2020-07-21 23:29:43,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 398 states. [2020-07-21 23:29:43,076 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 398 states to 398 states and 424 transitions. [2020-07-21 23:29:43,076 INFO L78 Accepts]: Start accepts. Automaton has 398 states and 424 transitions. Word has length 485 [2020-07-21 23:29:43,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:29:43,077 INFO L479 AbstractCegarLoop]: Abstraction has 398 states and 424 transitions. [2020-07-21 23:29:43,077 INFO L480 AbstractCegarLoop]: Interpolant automaton has 143 states. [2020-07-21 23:29:43,077 INFO L276 IsEmpty]: Start isEmpty. Operand 398 states and 424 transitions. [2020-07-21 23:29:43,080 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 488 [2020-07-21 23:29:43,081 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:29:43,081 INFO L422 BasicCegarLoop]: trace histogram [48, 48, 48, 48, 47, 47, 47, 47, 47, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:29:43,282 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 73 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:29:43,283 INFO L427 AbstractCegarLoop]: === Iteration 73 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:29:43,283 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:29:43,284 INFO L82 PathProgramCache]: Analyzing trace with hash 579393385, now seen corresponding path program 70 times [2020-07-21 23:29:43,284 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:29:43,284 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [204430702] [2020-07-21 23:29:43,285 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 74 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 74 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:29:43,533 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:29:43,533 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:29:43,544 INFO L263 TraceCheckSpWp]: Trace formula consists of 1312 conjuncts, 98 conjunts are in the unsatisfiable core [2020-07-21 23:29:43,551 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:30:06,147 INFO L134 CoverageAnalysis]: Checked inductivity of 11092 backedges. 4512 proven. 2256 refuted. 0 times theorem prover too weak. 4324 trivial. 0 not checked. [2020-07-21 23:30:06,148 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:30:33,604 INFO L134 CoverageAnalysis]: Checked inductivity of 11092 backedges. 4512 proven. 2256 refuted. 0 times theorem prover too weak. 4324 trivial. 0 not checked. [2020-07-21 23:30:33,605 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [204430702] [2020-07-21 23:30:33,605 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:30:33,605 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [98, 98] total 146 [2020-07-21 23:30:33,606 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2074257172] [2020-07-21 23:30:33,607 INFO L459 AbstractCegarLoop]: Interpolant automaton has 146 states [2020-07-21 23:30:33,607 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:30:33,608 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 146 interpolants. [2020-07-21 23:30:33,609 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4849, Invalid=16321, Unknown=0, NotChecked=0, Total=21170 [2020-07-21 23:30:33,609 INFO L87 Difference]: Start difference. First operand 398 states and 424 transitions. Second operand 146 states. [2020-07-21 23:31:02,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:31:02,715 INFO L93 Difference]: Finished difference Result 791 states and 961 transitions. [2020-07-21 23:31:02,715 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2020-07-21 23:31:02,716 INFO L78 Accepts]: Start accepts. Automaton has 146 states. Word has length 487 [2020-07-21 23:31:02,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:31:02,721 INFO L225 Difference]: With dead ends: 791 [2020-07-21 23:31:02,721 INFO L226 Difference]: Without dead ends: 592 [2020-07-21 23:31:02,728 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1021 GetRequests, 781 SyntacticMatches, 48 SemanticMatches, 192 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10105 ImplicationChecksByTransitivity, 60.4s TimeCoverageRelationStatistics Valid=9601, Invalid=27841, Unknown=0, NotChecked=0, Total=37442 [2020-07-21 23:31:02,730 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 592 states. [2020-07-21 23:31:02,754 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 592 to 400. [2020-07-21 23:31:02,754 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 400 states. [2020-07-21 23:31:02,755 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 400 states to 400 states and 426 transitions. [2020-07-21 23:31:02,756 INFO L78 Accepts]: Start accepts. Automaton has 400 states and 426 transitions. Word has length 487 [2020-07-21 23:31:02,756 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:31:02,756 INFO L479 AbstractCegarLoop]: Abstraction has 400 states and 426 transitions. [2020-07-21 23:31:02,756 INFO L480 AbstractCegarLoop]: Interpolant automaton has 146 states. [2020-07-21 23:31:02,756 INFO L276 IsEmpty]: Start isEmpty. Operand 400 states and 426 transitions. [2020-07-21 23:31:02,758 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 490 [2020-07-21 23:31:02,759 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:31:02,759 INFO L422 BasicCegarLoop]: trace histogram [49, 48, 48, 48, 48, 47, 47, 47, 47, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:31:02,960 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 74 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:31:02,961 INFO L427 AbstractCegarLoop]: === Iteration 74 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:31:02,961 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:31:02,962 INFO L82 PathProgramCache]: Analyzing trace with hash 1713263950, now seen corresponding path program 71 times [2020-07-21 23:31:02,962 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:31:02,962 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1310623610] [2020-07-21 23:31:02,963 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 75 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 75 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:31:03,224 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:31:03,224 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:31:03,235 INFO L263 TraceCheckSpWp]: Trace formula consists of 1322 conjuncts, 99 conjunts are in the unsatisfiable core [2020-07-21 23:31:03,242 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:31:10,823 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 23:31:11,252 INFO L134 CoverageAnalysis]: Checked inductivity of 11188 backedges. 2446 proven. 4418 refuted. 0 times theorem prover too weak. 4324 trivial. 0 not checked. [2020-07-21 23:31:11,253 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:31:11,519 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 23:31:26,204 INFO L134 CoverageAnalysis]: Checked inductivity of 11188 backedges. 2446 proven. 4418 refuted. 0 times theorem prover too weak. 4324 trivial. 0 not checked. [2020-07-21 23:31:26,204 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1310623610] [2020-07-21 23:31:26,204 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:31:26,205 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53] total 54 [2020-07-21 23:31:26,205 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [230839067] [2020-07-21 23:31:26,206 INFO L459 AbstractCegarLoop]: Interpolant automaton has 54 states [2020-07-21 23:31:26,206 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:31:26,206 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2020-07-21 23:31:26,207 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1330, Invalid=1532, Unknown=0, NotChecked=0, Total=2862 [2020-07-21 23:31:26,207 INFO L87 Difference]: Start difference. First operand 400 states and 426 transitions. Second operand 54 states. [2020-07-21 23:31:30,072 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:31:30,072 INFO L93 Difference]: Finished difference Result 419 states and 447 transitions. [2020-07-21 23:31:30,080 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2020-07-21 23:31:30,080 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 489 [2020-07-21 23:31:30,081 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:31:30,084 INFO L225 Difference]: With dead ends: 419 [2020-07-21 23:31:30,084 INFO L226 Difference]: Without dead ends: 417 [2020-07-21 23:31:30,085 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 978 GetRequests, 829 SyntacticMatches, 96 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2639 ImplicationChecksByTransitivity, 21.3s TimeCoverageRelationStatistics Valid=1334, Invalid=1636, Unknown=0, NotChecked=0, Total=2970 [2020-07-21 23:31:30,086 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 417 states. [2020-07-21 23:31:30,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 417 to 412. [2020-07-21 23:31:30,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 412 states. [2020-07-21 23:31:30,109 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 412 states to 412 states and 439 transitions. [2020-07-21 23:31:30,110 INFO L78 Accepts]: Start accepts. Automaton has 412 states and 439 transitions. Word has length 489 [2020-07-21 23:31:30,110 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:31:30,110 INFO L479 AbstractCegarLoop]: Abstraction has 412 states and 439 transitions. [2020-07-21 23:31:30,110 INFO L480 AbstractCegarLoop]: Interpolant automaton has 54 states. [2020-07-21 23:31:30,111 INFO L276 IsEmpty]: Start isEmpty. Operand 412 states and 439 transitions. [2020-07-21 23:31:30,114 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 506 [2020-07-21 23:31:30,114 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:31:30,115 INFO L422 BasicCegarLoop]: trace histogram [50, 50, 50, 49, 49, 49, 49, 49, 49, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:31:30,315 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 75 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:31:30,316 INFO L427 AbstractCegarLoop]: === Iteration 75 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:31:30,317 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:31:30,317 INFO L82 PathProgramCache]: Analyzing trace with hash -831186128, now seen corresponding path program 72 times [2020-07-21 23:31:30,318 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:31:30,318 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [252956824] [2020-07-21 23:31:30,318 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 76 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 76 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:31:30,589 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:31:30,590 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:31:30,601 INFO L263 TraceCheckSpWp]: Trace formula consists of 1356 conjuncts, 100 conjunts are in the unsatisfiable core [2020-07-21 23:31:30,609 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:31:55,789 INFO L134 CoverageAnalysis]: Checked inductivity of 11956 backedges. 5088 proven. 2352 refuted. 0 times theorem prover too weak. 4516 trivial. 0 not checked. [2020-07-21 23:31:55,790 INFO L328 TraceCheckSpWp]: Computing backward predicates...