/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_6-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 16:54:07,813 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 16:54:07,816 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 16:54:07,831 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 16:54:07,831 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 16:54:07,833 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 16:54:07,835 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 16:54:07,837 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 16:54:07,840 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 16:54:07,841 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 16:54:07,842 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 16:54:07,844 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 16:54:07,845 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 16:54:07,846 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 16:54:07,848 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 16:54:07,850 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 16:54:07,851 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 16:54:07,853 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 16:54:07,855 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 16:54:07,859 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 16:54:07,861 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 16:54:07,863 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 16:54:07,865 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 16:54:07,867 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 16:54:07,871 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 16:54:07,884 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 16:54:07,886 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 16:54:07,887 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 16:54:07,888 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 16:54:07,918 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 16:54:07,918 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 16:54:07,920 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 16:54:07,920 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 16:54:07,921 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 16:54:07,921 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 16:54:07,921 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 16:54:07,921 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 16:54:07,921 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 16:54:07,922 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 16:54:07,922 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 16:54:07,922 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 16:54:07,922 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 16:54:07,922 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 16:54:07,923 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 16:54:07,923 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 16:54:07,923 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 16:54:07,923 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 16:54:07,924 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 16:54:07,924 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 16:54:07,924 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 16:54:07,924 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 16:54:07,925 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 16:54:07,925 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 16:54:07,925 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 16:54:07,925 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 16:54:07,925 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:07,925 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 16:54:07,926 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 16:54:07,926 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_VARIABLES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 16:54:08,274 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 16:54:08,306 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 16:54:08,311 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 16:54:08,313 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 16:54:08,314 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 16:54:08,315 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_6-1.c [2020-07-20 16:54:08,427 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/964196720/8bbba8d5a4774a649fee2e7d640f2d4c/FLAG6953c2730 [2020-07-20 16:54:08,987 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 16:54:08,987 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_2calls_6-1.c [2020-07-20 16:54:08,997 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/964196720/8bbba8d5a4774a649fee2e7d640f2d4c/FLAG6953c2730 [2020-07-20 16:54:09,374 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/964196720/8bbba8d5a4774a649fee2e7d640f2d4c [2020-07-20 16:54:09,389 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 16:54:09,394 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 16:54:09,402 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 16:54:09,403 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 16:54:09,407 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 16:54:09,411 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 04:54:09" (1/1) ... [2020-07-20 16:54:09,417 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5174a507 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:54:09, skipping insertion in model container [2020-07-20 16:54:09,417 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 04:54:09" (1/1) ... [2020-07-20 16:54:09,429 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 16:54:09,458 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 16:54:09,701 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 16:54:09,705 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 16:54:09,723 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 16:54:09,738 INFO L208 MainTranslator]: Completed translation [2020-07-20 16:54:09,739 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:54:09 WrapperNode [2020-07-20 16:54:09,739 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 16:54:09,740 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 16:54:09,740 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 16:54:09,740 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 16:54:09,754 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:54:09" (1/1) ... [2020-07-20 16:54:09,754 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:54:09" (1/1) ... [2020-07-20 16:54:09,759 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:54:09" (1/1) ... [2020-07-20 16:54:09,760 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:54:09" (1/1) ... [2020-07-20 16:54:09,851 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:54:09" (1/1) ... [2020-07-20 16:54:09,854 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:54:09" (1/1) ... [2020-07-20 16:54:09,855 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:54:09" (1/1) ... [2020-07-20 16:54:09,862 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 16:54:09,863 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 16:54:09,863 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 16:54:09,864 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 16:54:09,865 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:54:09" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 16:54:09,922 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 16:54:09,922 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 16:54:09,923 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2020-07-20 16:54:09,923 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2020-07-20 16:54:09,923 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 16:54:09,923 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 16:54:09,923 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 16:54:09,923 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2020-07-20 16:54:09,924 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2020-07-20 16:54:09,924 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 16:54:09,924 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 16:54:09,924 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 16:54:10,132 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 16:54:10,133 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 16:54:10,137 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 04:54:10 BoogieIcfgContainer [2020-07-20 16:54:10,137 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 16:54:10,138 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 16:54:10,139 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 16:54:10,142 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 16:54:10,142 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 04:54:09" (1/3) ... [2020-07-20 16:54:10,143 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6f418c31 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 04:54:10, skipping insertion in model container [2020-07-20 16:54:10,143 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:54:09" (2/3) ... [2020-07-20 16:54:10,144 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6f418c31 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 04:54:10, skipping insertion in model container [2020-07-20 16:54:10,144 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 04:54:10" (3/3) ... [2020-07-20 16:54:10,146 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_2calls_6-1.c [2020-07-20 16:54:10,156 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 16:54:10,164 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 16:54:10,178 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 16:54:10,203 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 16:54:10,203 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 16:54:10,203 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 16:54:10,203 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 16:54:10,203 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 16:54:10,203 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 16:54:10,204 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 16:54:10,204 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 16:54:10,220 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-07-20 16:54:10,226 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 16:54:10,227 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:54:10,228 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:54:10,228 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:54:10,234 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:54:10,234 INFO L82 PathProgramCache]: Analyzing trace with hash 1464461757, now seen corresponding path program 1 times [2020-07-20 16:54:10,243 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:54:10,244 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [346777974] [2020-07-20 16:54:10,244 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:10,334 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:54:10,335 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:54:10,337 INFO L263 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 16:54:10,343 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:54:10,442 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 16:54:10,442 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 16:54:10,444 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [346777974] [2020-07-20 16:54:10,444 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 16:54:10,445 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 16:54:10,446 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1784236003] [2020-07-20 16:54:10,452 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 16:54:10,452 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:54:10,468 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 16:54:10,469 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 16:54:10,472 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 5 states. [2020-07-20 16:54:10,586 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:54:10,586 INFO L93 Difference]: Finished difference Result 44 states and 53 transitions. [2020-07-20 16:54:10,587 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 16:54:10,589 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-20 16:54:10,590 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:54:10,600 INFO L225 Difference]: With dead ends: 44 [2020-07-20 16:54:10,600 INFO L226 Difference]: Without dead ends: 30 [2020-07-20 16:54:10,604 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 16:54:10,622 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-20 16:54:10,649 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-07-20 16:54:10,650 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 16:54:10,652 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-20 16:54:10,654 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 13 [2020-07-20 16:54:10,654 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:54:10,654 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-20 16:54:10,654 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 16:54:10,654 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-20 16:54:10,656 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-20 16:54:10,656 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:54:10,656 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:54:10,869 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:10,870 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:54:10,870 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:54:10,871 INFO L82 PathProgramCache]: Analyzing trace with hash -1134800479, now seen corresponding path program 1 times [2020-07-20 16:54:10,872 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:54:10,872 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [587580924] [2020-07-20 16:54:10,873 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:10,904 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:54:10,904 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:54:10,905 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 16:54:10,907 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:54:10,959 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 16:54:10,960 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 16:54:10,960 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [587580924] [2020-07-20 16:54:10,961 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 16:54:10,961 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 16:54:10,961 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [435472190] [2020-07-20 16:54:10,963 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 16:54:10,963 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:54:10,964 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 16:54:10,964 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 16:54:10,964 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 5 states. [2020-07-20 16:54:11,042 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:54:11,042 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-07-20 16:54:11,043 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 16:54:11,044 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-20 16:54:11,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:54:11,047 INFO L225 Difference]: With dead ends: 36 [2020-07-20 16:54:11,047 INFO L226 Difference]: Without dead ends: 32 [2020-07-20 16:54:11,049 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 16:54:11,050 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-20 16:54:11,060 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-07-20 16:54:11,061 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 16:54:11,063 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-20 16:54:11,064 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 14 [2020-07-20 16:54:11,064 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:54:11,064 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-20 16:54:11,064 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 16:54:11,065 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-20 16:54:11,066 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 16:54:11,067 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:54:11,067 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, 1] [2020-07-20 16:54:11,282 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:11,282 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:54:11,283 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:54:11,283 INFO L82 PathProgramCache]: Analyzing trace with hash -1592795560, now seen corresponding path program 1 times [2020-07-20 16:54:11,284 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:54:11,284 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1435751146] [2020-07-20 16:54:11,285 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 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:11,322 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:54:11,323 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:54:11,324 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 16:54:11,327 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:54:11,410 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 16:54:11,410 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:54:11,609 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:11,612 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:11,681 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 16:54:11,682 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1435751146] [2020-07-20 16:54:11,685 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:54:11,685 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-20 16:54:11,685 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [137515434] [2020-07-20 16:54:11,686 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 16:54:11,686 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:54:11,687 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 16:54:11,687 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-20 16:54:11,690 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 10 states. [2020-07-20 16:54:11,857 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:54:11,858 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2020-07-20 16:54:11,858 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 16:54:11,858 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 26 [2020-07-20 16:54:11,859 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:54:11,861 INFO L225 Difference]: With dead ends: 41 [2020-07-20 16:54:11,861 INFO L226 Difference]: Without dead ends: 37 [2020-07-20 16:54:11,862 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 39 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-20 16:54:11,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-20 16:54:11,870 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2020-07-20 16:54:11,870 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-20 16:54:11,872 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-20 16:54:11,872 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 26 [2020-07-20 16:54:11,873 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:54:11,873 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-20 16:54:11,873 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 16:54:11,873 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-20 16:54:11,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 16:54:11,875 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:54:11,875 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:54:12,089 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:12,090 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:54:12,091 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:54:12,091 INFO L82 PathProgramCache]: Analyzing trace with hash 746633022, now seen corresponding path program 1 times [2020-07-20 16:54:12,092 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:54:12,092 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [703868046] [2020-07-20 16:54:12,092 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:12,141 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:54:12,141 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:54:12,142 INFO L263 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 16:54:12,145 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:54:12,198 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 16:54:12,199 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:54:12,365 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:12,368 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:12,416 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 16:54:12,417 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [703868046] [2020-07-20 16:54:12,418 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:54:12,418 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-20 16:54:12,418 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1789798689] [2020-07-20 16:54:12,419 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 16:54:12,419 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:54:12,420 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 16:54:12,420 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-20 16:54:12,420 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 10 states. [2020-07-20 16:54:12,610 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:54:12,611 INFO L93 Difference]: Finished difference Result 46 states and 62 transitions. [2020-07-20 16:54:12,611 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 16:54:12,612 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-07-20 16:54:12,613 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:54:12,615 INFO L225 Difference]: With dead ends: 46 [2020-07-20 16:54:12,616 INFO L226 Difference]: Without dead ends: 42 [2020-07-20 16:54:12,617 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 42 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-20 16:54:12,623 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-20 16:54:12,639 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 35. [2020-07-20 16:54:12,640 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-20 16:54:12,645 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-20 16:54:12,645 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 27 [2020-07-20 16:54:12,646 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:54:12,646 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-20 16:54:12,646 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 16:54:12,646 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-20 16:54:12,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-20 16:54:12,653 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:54:12,653 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:54:12,867 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:12,868 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:54:12,868 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:54:12,869 INFO L82 PathProgramCache]: Analyzing trace with hash 986908919, now seen corresponding path program 1 times [2020-07-20 16:54:12,869 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:54:12,870 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [957533796] [2020-07-20 16:54:12,870 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:12,910 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:54:12,910 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:54:12,912 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 16:54:12,915 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:54:12,988 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-20 16:54:12,989 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:54:13,302 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:13,367 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:13,369 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:13,442 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 16:54:13,442 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [957533796] [2020-07-20 16:54:13,443 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:54:13,443 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-20 16:54:13,443 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [702199282] [2020-07-20 16:54:13,444 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 16:54:13,444 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:54:13,445 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 16:54:13,445 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-20 16:54:13,445 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 12 states. [2020-07-20 16:54:13,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:54:13,677 INFO L93 Difference]: Finished difference Result 51 states and 72 transitions. [2020-07-20 16:54:13,678 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 16:54:13,679 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 39 [2020-07-20 16:54:13,679 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:54:13,682 INFO L225 Difference]: With dead ends: 51 [2020-07-20 16:54:13,682 INFO L226 Difference]: Without dead ends: 47 [2020-07-20 16:54:13,684 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 63 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-20 16:54:13,685 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-07-20 16:54:13,694 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 40. [2020-07-20 16:54:13,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-20 16:54:13,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-07-20 16:54:13,696 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 39 [2020-07-20 16:54:13,697 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:54:13,697 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-07-20 16:54:13,697 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 16:54:13,697 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-07-20 16:54:13,699 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-07-20 16:54:13,699 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:54:13,699 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:54:13,912 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:13,914 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:54:13,914 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:54:13,915 INFO L82 PathProgramCache]: Analyzing trace with hash -2100495745, now seen corresponding path program 1 times [2020-07-20 16:54:13,915 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:54:13,916 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1089069193] [2020-07-20 16:54:13,916 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:13,949 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:54:13,950 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:54:13,950 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 16:54:13,953 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:54:14,012 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-20 16:54:14,012 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:54:14,316 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:14,317 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:14,356 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-20 16:54:14,357 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1089069193] [2020-07-20 16:54:14,357 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:54:14,357 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 12 [2020-07-20 16:54:14,357 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [489130316] [2020-07-20 16:54:14,360 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 16:54:14,361 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:54:14,361 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 16:54:14,362 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2020-07-20 16:54:14,362 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 12 states. [2020-07-20 16:54:14,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:54:14,735 INFO L93 Difference]: Finished difference Result 84 states and 136 transitions. [2020-07-20 16:54:14,736 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 16:54:14,736 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 40 [2020-07-20 16:54:14,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:54:14,745 INFO L225 Difference]: With dead ends: 84 [2020-07-20 16:54:14,746 INFO L226 Difference]: Without dead ends: 50 [2020-07-20 16:54:14,748 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 64 SyntacticMatches, 7 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=61, Invalid=211, Unknown=0, NotChecked=0, Total=272 [2020-07-20 16:54:14,748 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-07-20 16:54:14,760 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 47. [2020-07-20 16:54:14,761 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-07-20 16:54:14,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 67 transitions. [2020-07-20 16:54:14,764 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 67 transitions. Word has length 40 [2020-07-20 16:54:14,764 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:54:14,765 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 67 transitions. [2020-07-20 16:54:14,765 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 16:54:14,765 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 67 transitions. [2020-07-20 16:54:14,769 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-20 16:54:14,769 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:54:14,770 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:54:14,983 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:14,984 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:54:14,986 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:54:14,986 INFO L82 PathProgramCache]: Analyzing trace with hash 208191613, now seen corresponding path program 1 times [2020-07-20 16:54:14,987 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:54:14,987 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1914312808] [2020-07-20 16:54:14,987 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:15,035 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:54:15,036 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:54:15,041 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 16:54:15,044 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:54:15,145 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-20 16:54:15,146 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:54:15,423 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:15,487 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:15,566 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 12 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 16:54:15,566 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1914312808] [2020-07-20 16:54:15,567 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:54:15,567 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-20 16:54:15,567 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1560827173] [2020-07-20 16:54:15,568 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 16:54:15,568 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:54:15,568 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 16:54:15,569 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-20 16:54:15,569 INFO L87 Difference]: Start difference. First operand 47 states and 67 transitions. Second operand 12 states. [2020-07-20 16:54:15,795 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:54:15,795 INFO L93 Difference]: Finished difference Result 63 states and 99 transitions. [2020-07-20 16:54:15,796 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 16:54:15,796 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 41 [2020-07-20 16:54:15,797 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:54:15,798 INFO L225 Difference]: With dead ends: 63 [2020-07-20 16:54:15,799 INFO L226 Difference]: Without dead ends: 59 [2020-07-20 16:54:15,800 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 68 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-20 16:54:15,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-07-20 16:54:15,814 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 51. [2020-07-20 16:54:15,814 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-20 16:54:15,816 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 77 transitions. [2020-07-20 16:54:15,817 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 77 transitions. Word has length 41 [2020-07-20 16:54:15,818 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:54:15,818 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 77 transitions. [2020-07-20 16:54:15,818 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 16:54:15,818 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 77 transitions. [2020-07-20 16:54:15,821 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-07-20 16:54:15,821 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:54:15,822 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:54:16,029 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:16,030 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:54:16,030 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:54:16,031 INFO L82 PathProgramCache]: Analyzing trace with hash -1291563674, now seen corresponding path program 1 times [2020-07-20 16:54:16,031 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:54:16,032 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [722129751] [2020-07-20 16:54:16,032 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:16,076 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:54:16,076 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:54:16,077 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 16:54:16,081 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:54:16,152 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 17 proven. 4 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-20 16:54:16,153 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:54:16,328 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:16,386 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:16,431 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 17 proven. 4 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-20 16:54:16,432 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [722129751] [2020-07-20 16:54:16,437 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:54:16,438 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-20 16:54:16,439 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1403476942] [2020-07-20 16:54:16,441 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 16:54:16,442 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:54:16,442 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 16:54:16,443 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-20 16:54:16,443 INFO L87 Difference]: Start difference. First operand 51 states and 77 transitions. Second operand 10 states. [2020-07-20 16:54:16,626 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:54:16,626 INFO L93 Difference]: Finished difference Result 65 states and 105 transitions. [2020-07-20 16:54:16,627 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 16:54:16,627 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 53 [2020-07-20 16:54:16,628 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:54:16,630 INFO L225 Difference]: With dead ends: 65 [2020-07-20 16:54:16,630 INFO L226 Difference]: Without dead ends: 61 [2020-07-20 16:54:16,631 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 95 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-20 16:54:16,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-07-20 16:54:16,644 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 53. [2020-07-20 16:54:16,644 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-07-20 16:54:16,646 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 82 transitions. [2020-07-20 16:54:16,646 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 82 transitions. Word has length 53 [2020-07-20 16:54:16,647 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:54:16,647 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 82 transitions. [2020-07-20 16:54:16,647 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 16:54:16,647 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 82 transitions. [2020-07-20 16:54:16,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-07-20 16:54:16,651 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:54:16,651 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:54:16,865 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:16,867 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:54:16,867 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:54:16,868 INFO L82 PathProgramCache]: Analyzing trace with hash 736840020, now seen corresponding path program 2 times [2020-07-20 16:54:16,868 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:54:16,869 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [198674598] [2020-07-20 16:54:16,870 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:16,927 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:54:16,928 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:54:16,929 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 16:54:16,933 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:54:17,027 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 9 proven. 55 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2020-07-20 16:54:17,027 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:54:17,484 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:17,485 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:17,605 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:17,606 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:17,671 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:17,673 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:17,725 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 9 proven. 59 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2020-07-20 16:54:17,726 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [198674598] [2020-07-20 16:54:17,726 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:54:17,727 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-20 16:54:17,727 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [260230761] [2020-07-20 16:54:17,728 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 16:54:17,729 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:54:17,729 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 16:54:17,730 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-20 16:54:17,730 INFO L87 Difference]: Start difference. First operand 53 states and 82 transitions. Second operand 14 states. [2020-07-20 16:54:17,979 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:54:17,980 INFO L93 Difference]: Finished difference Result 75 states and 134 transitions. [2020-07-20 16:54:17,980 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 16:54:17,981 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 78 [2020-07-20 16:54:17,982 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:54:17,983 INFO L225 Difference]: With dead ends: 75 [2020-07-20 16:54:17,984 INFO L226 Difference]: Without dead ends: 71 [2020-07-20 16:54:17,985 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 137 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-20 16:54:17,986 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2020-07-20 16:54:18,000 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 56. [2020-07-20 16:54:18,001 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-20 16:54:18,002 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 90 transitions. [2020-07-20 16:54:18,003 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 90 transitions. Word has length 78 [2020-07-20 16:54:18,004 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:54:18,004 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 90 transitions. [2020-07-20 16:54:18,004 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 16:54:18,004 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 90 transitions. [2020-07-20 16:54:18,007 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-07-20 16:54:18,007 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:54:18,008 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:54:18,221 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:18,222 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:54:18,222 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:54:18,223 INFO L82 PathProgramCache]: Analyzing trace with hash 1583364703, now seen corresponding path program 1 times [2020-07-20 16:54:18,223 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:54:18,224 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [559707741] [2020-07-20 16:54:18,224 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 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:18,284 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:54:18,285 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:54:18,286 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 16:54:18,289 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:54:18,366 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 54 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-20 16:54:18,367 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:54:18,765 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:18,766 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:18,797 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 21 proven. 28 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2020-07-20 16:54:18,798 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [559707741] [2020-07-20 16:54:18,798 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:54:18,798 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 12 [2020-07-20 16:54:18,799 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [213993364] [2020-07-20 16:54:18,799 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 16:54:18,799 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:54:18,800 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 16:54:18,800 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2020-07-20 16:54:18,800 INFO L87 Difference]: Start difference. First operand 56 states and 90 transitions. Second operand 12 states. [2020-07-20 16:54:19,059 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:54:19,060 INFO L93 Difference]: Finished difference Result 114 states and 219 transitions. [2020-07-20 16:54:19,062 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 16:54:19,062 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 67 [2020-07-20 16:54:19,063 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:54:19,064 INFO L225 Difference]: With dead ends: 114 [2020-07-20 16:54:19,064 INFO L226 Difference]: Without dead ends: 64 [2020-07-20 16:54:19,067 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 119 SyntacticMatches, 7 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=61, Invalid=211, Unknown=0, NotChecked=0, Total=272 [2020-07-20 16:54:19,068 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-07-20 16:54:19,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 61. [2020-07-20 16:54:19,089 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-20 16:54:19,090 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 101 transitions. [2020-07-20 16:54:19,091 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 101 transitions. Word has length 67 [2020-07-20 16:54:19,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:54:19,092 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 101 transitions. [2020-07-20 16:54:19,092 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 16:54:19,092 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 101 transitions. [2020-07-20 16:54:19,094 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-07-20 16:54:19,094 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:54:19,094 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:54:19,308 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:19,309 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:54:19,309 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:54:19,310 INFO L82 PathProgramCache]: Analyzing trace with hash -1763147687, now seen corresponding path program 2 times [2020-07-20 16:54:19,311 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:54:19,311 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [964886238] [2020-07-20 16:54:19,312 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:19,369 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:54:19,369 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:54:19,370 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 16:54:19,373 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:54:19,497 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 23 proven. 32 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2020-07-20 16:54:19,497 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:54:19,844 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:20,107 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:20,109 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:20,169 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:20,216 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 23 proven. 34 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2020-07-20 16:54:20,217 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [964886238] [2020-07-20 16:54:20,217 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:54:20,217 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 17 [2020-07-20 16:54:20,217 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [426508814] [2020-07-20 16:54:20,218 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 16:54:20,219 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:54:20,219 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 16:54:20,219 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2020-07-20 16:54:20,219 INFO L87 Difference]: Start difference. First operand 61 states and 101 transitions. Second operand 17 states. [2020-07-20 16:54:20,744 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:54:20,744 INFO L93 Difference]: Finished difference Result 131 states and 252 transitions. [2020-07-20 16:54:20,745 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 16:54:20,745 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 68 [2020-07-20 16:54:20,746 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:54:20,749 INFO L225 Difference]: With dead ends: 131 [2020-07-20 16:54:20,749 INFO L226 Difference]: Without dead ends: 76 [2020-07-20 16:54:20,752 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 116 SyntacticMatches, 11 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=124, Invalid=526, Unknown=0, NotChecked=0, Total=650 [2020-07-20 16:54:20,754 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-07-20 16:54:20,786 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 68. [2020-07-20 16:54:20,787 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2020-07-20 16:54:20,791 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 106 transitions. [2020-07-20 16:54:20,791 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 106 transitions. Word has length 68 [2020-07-20 16:54:20,795 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:54:20,796 INFO L479 AbstractCegarLoop]: Abstraction has 68 states and 106 transitions. [2020-07-20 16:54:20,796 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 16:54:20,796 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 106 transitions. [2020-07-20 16:54:20,801 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-07-20 16:54:20,801 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:54:20,801 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:54:21,002 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:21,003 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:54:21,004 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:54:21,004 INFO L82 PathProgramCache]: Analyzing trace with hash -1986769418, now seen corresponding path program 1 times [2020-07-20 16:54:21,004 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:54:21,005 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [147418652] [2020-07-20 16:54:21,005 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:21,060 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:54:21,061 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:54:21,062 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 16:54:21,066 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:54:21,193 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 39 proven. 53 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-20 16:54:21,194 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:54:21,689 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:21,691 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:21,749 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:21,750 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:21,788 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:21,796 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:22,028 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:22,088 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:22,089 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:22,137 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 39 proven. 57 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2020-07-20 16:54:22,138 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [147418652] [2020-07-20 16:54:22,138 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:54:22,138 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 21 [2020-07-20 16:54:22,139 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [657678804] [2020-07-20 16:54:22,139 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 16:54:22,140 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:54:22,140 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 16:54:22,140 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2020-07-20 16:54:22,140 INFO L87 Difference]: Start difference. First operand 68 states and 106 transitions. Second operand 21 states. [2020-07-20 16:54:23,162 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:54:23,163 INFO L93 Difference]: Finished difference Result 186 states and 366 transitions. [2020-07-20 16:54:23,165 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-07-20 16:54:23,165 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 82 [2020-07-20 16:54:23,165 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:54:23,170 INFO L225 Difference]: With dead ends: 186 [2020-07-20 16:54:23,170 INFO L226 Difference]: Without dead ends: 124 [2020-07-20 16:54:23,173 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 193 GetRequests, 145 SyntacticMatches, 11 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 209 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=268, Invalid=1214, Unknown=0, NotChecked=0, Total=1482 [2020-07-20 16:54:23,174 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2020-07-20 16:54:23,195 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 110. [2020-07-20 16:54:23,196 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 110 states. [2020-07-20 16:54:23,204 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 179 transitions. [2020-07-20 16:54:23,204 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 179 transitions. Word has length 82 [2020-07-20 16:54:23,205 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:54:23,207 INFO L479 AbstractCegarLoop]: Abstraction has 110 states and 179 transitions. [2020-07-20 16:54:23,208 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 16:54:23,208 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 179 transitions. [2020-07-20 16:54:23,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-07-20 16:54:23,210 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:54:23,212 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:54:23,427 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:23,428 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:54:23,429 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:54:23,429 INFO L82 PathProgramCache]: Analyzing trace with hash -1156896337, now seen corresponding path program 3 times [2020-07-20 16:54:23,430 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:54:23,430 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1603376661] [2020-07-20 16:54:23,431 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:23,496 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:54:23,496 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:54:23,497 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 16:54:23,500 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:54:23,571 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 8 proven. 39 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2020-07-20 16:54:23,571 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:54:23,966 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:24,058 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:24,060 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:24,110 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:24,145 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 8 proven. 44 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2020-07-20 16:54:24,146 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1603376661] [2020-07-20 16:54:24,146 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:54:24,146 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-20 16:54:24,146 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1147262056] [2020-07-20 16:54:24,147 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 16:54:24,147 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:54:24,147 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 16:54:24,147 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-20 16:54:24,148 INFO L87 Difference]: Start difference. First operand 110 states and 179 transitions. Second operand 14 states. [2020-07-20 16:54:24,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:54:24,348 INFO L93 Difference]: Finished difference Result 114 states and 182 transitions. [2020-07-20 16:54:24,350 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 16:54:24,350 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 68 [2020-07-20 16:54:24,350 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:54:24,352 INFO L225 Difference]: With dead ends: 114 [2020-07-20 16:54:24,353 INFO L226 Difference]: Without dead ends: 110 [2020-07-20 16:54:24,354 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 118 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-20 16:54:24,354 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2020-07-20 16:54:24,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 102. [2020-07-20 16:54:24,367 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2020-07-20 16:54:24,368 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 159 transitions. [2020-07-20 16:54:24,369 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 159 transitions. Word has length 68 [2020-07-20 16:54:24,370 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:54:24,370 INFO L479 AbstractCegarLoop]: Abstraction has 102 states and 159 transitions. [2020-07-20 16:54:24,370 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 16:54:24,370 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 159 transitions. [2020-07-20 16:54:24,372 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2020-07-20 16:54:24,372 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:54:24,373 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:54:24,588 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:24,588 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:54:24,589 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:54:24,589 INFO L82 PathProgramCache]: Analyzing trace with hash 918304791, now seen corresponding path program 4 times [2020-07-20 16:54:24,590 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:54:24,590 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [937624119] [2020-07-20 16:54:24,591 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:24,659 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:54:24,659 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:54:24,661 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 16:54:24,663 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:54:24,795 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 78 proven. 33 refuted. 0 times theorem prover too weak. 73 trivial. 0 not checked. [2020-07-20 16:54:24,796 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:54:25,256 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:25,322 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:25,362 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:25,498 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:25,499 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:25,546 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:25,582 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 78 proven. 35 refuted. 0 times theorem prover too weak. 71 trivial. 0 not checked. [2020-07-20 16:54:25,583 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [937624119] [2020-07-20 16:54:25,583 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:54:25,583 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 19 [2020-07-20 16:54:25,584 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [665693334] [2020-07-20 16:54:25,584 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 16:54:25,585 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:54:25,585 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 16:54:25,585 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2020-07-20 16:54:25,586 INFO L87 Difference]: Start difference. First operand 102 states and 159 transitions. Second operand 19 states. [2020-07-20 16:54:26,177 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:54:26,178 INFO L93 Difference]: Finished difference Result 269 states and 520 transitions. [2020-07-20 16:54:26,179 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 16:54:26,179 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 94 [2020-07-20 16:54:26,180 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:54:26,185 INFO L225 Difference]: With dead ends: 269 [2020-07-20 16:54:26,185 INFO L226 Difference]: Without dead ends: 168 [2020-07-20 16:54:26,189 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 199 GetRequests, 162 SyntacticMatches, 9 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=157, Invalid=713, Unknown=0, NotChecked=0, Total=870 [2020-07-20 16:54:26,191 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2020-07-20 16:54:26,219 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 144. [2020-07-20 16:54:26,220 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 144 states. [2020-07-20 16:54:26,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 247 transitions. [2020-07-20 16:54:26,229 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 247 transitions. Word has length 94 [2020-07-20 16:54:26,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:54:26,232 INFO L479 AbstractCegarLoop]: Abstraction has 144 states and 247 transitions. [2020-07-20 16:54:26,232 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 16:54:26,232 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 247 transitions. [2020-07-20 16:54:26,236 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-07-20 16:54:26,236 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:54:26,236 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:54:26,451 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:26,452 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:54:26,453 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:54:26,453 INFO L82 PathProgramCache]: Analyzing trace with hash -1676117994, now seen corresponding path program 2 times [2020-07-20 16:54:26,453 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:54:26,454 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1589243171] [2020-07-20 16:54:26,454 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:26,552 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:54:26,553 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:54:26,554 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 16:54:26,556 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:54:26,606 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 30 proven. 29 refuted. 0 times theorem prover too weak. 74 trivial. 0 not checked. [2020-07-20 16:54:26,606 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:54:26,880 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:26,924 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:26,926 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:26,974 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:27,010 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 30 proven. 31 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2020-07-20 16:54:27,010 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1589243171] [2020-07-20 16:54:27,011 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:54:27,011 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-20 16:54:27,011 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1408021874] [2020-07-20 16:54:27,012 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 16:54:27,012 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:54:27,012 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 16:54:27,012 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-20 16:54:27,012 INFO L87 Difference]: Start difference. First operand 144 states and 247 transitions. Second operand 12 states. [2020-07-20 16:54:27,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:54:27,223 INFO L93 Difference]: Finished difference Result 167 states and 289 transitions. [2020-07-20 16:54:27,224 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 16:54:27,224 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 80 [2020-07-20 16:54:27,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:54:27,228 INFO L225 Difference]: With dead ends: 167 [2020-07-20 16:54:27,229 INFO L226 Difference]: Without dead ends: 163 [2020-07-20 16:54:27,233 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 144 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-20 16:54:27,234 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2020-07-20 16:54:27,260 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 157. [2020-07-20 16:54:27,260 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 157 states. [2020-07-20 16:54:27,263 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 272 transitions. [2020-07-20 16:54:27,264 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 272 transitions. Word has length 80 [2020-07-20 16:54:27,264 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:54:27,264 INFO L479 AbstractCegarLoop]: Abstraction has 157 states and 272 transitions. [2020-07-20 16:54:27,265 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 16:54:27,265 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 272 transitions. [2020-07-20 16:54:27,270 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2020-07-20 16:54:27,270 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:54:27,271 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:54:27,483 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:27,485 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:54:27,485 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:54:27,485 INFO L82 PathProgramCache]: Analyzing trace with hash 2019487259, now seen corresponding path program 3 times [2020-07-20 16:54:27,485 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:54:27,486 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [79185209] [2020-07-20 16:54:27,486 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:27,562 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:54:27,562 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:54:27,564 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 16:54:27,566 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:54:27,681 INFO L134 CoverageAnalysis]: Checked inductivity of 357 backedges. 177 proven. 90 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2020-07-20 16:54:27,681 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:54:28,567 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:28,568 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:28,624 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:28,912 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:28,970 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:29,030 INFO L134 CoverageAnalysis]: Checked inductivity of 357 backedges. 71 proven. 141 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2020-07-20 16:54:29,030 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [79185209] [2020-07-20 16:54:29,032 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:54:29,033 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 21 [2020-07-20 16:54:29,033 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [330642085] [2020-07-20 16:54:29,034 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 16:54:29,034 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:54:29,034 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 16:54:29,034 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2020-07-20 16:54:29,035 INFO L87 Difference]: Start difference. First operand 157 states and 272 transitions. Second operand 21 states. [2020-07-20 16:54:29,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:54:29,689 INFO L93 Difference]: Finished difference Result 369 states and 701 transitions. [2020-07-20 16:54:29,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-07-20 16:54:29,690 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 120 [2020-07-20 16:54:29,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:54:29,694 INFO L225 Difference]: With dead ends: 369 [2020-07-20 16:54:29,695 INFO L226 Difference]: Without dead ends: 218 [2020-07-20 16:54:29,698 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 255 GetRequests, 213 SyntacticMatches, 11 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=187, Invalid=869, Unknown=0, NotChecked=0, Total=1056 [2020-07-20 16:54:29,699 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 218 states. [2020-07-20 16:54:29,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 218 to 173. [2020-07-20 16:54:29,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 173 states. [2020-07-20 16:54:29,722 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 306 transitions. [2020-07-20 16:54:29,723 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 306 transitions. Word has length 120 [2020-07-20 16:54:29,723 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:54:29,723 INFO L479 AbstractCegarLoop]: Abstraction has 173 states and 306 transitions. [2020-07-20 16:54:29,723 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 16:54:29,723 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 306 transitions. [2020-07-20 16:54:29,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-07-20 16:54:29,727 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:54:29,727 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:54:29,941 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:29,942 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:54:29,942 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:54:29,943 INFO L82 PathProgramCache]: Analyzing trace with hash -923530611, now seen corresponding path program 4 times [2020-07-20 16:54:29,943 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:54:29,944 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1446878854] [2020-07-20 16:54:29,944 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:30,022 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:54:30,023 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:54:30,024 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 16:54:30,026 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:54:30,093 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 55 proven. 14 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2020-07-20 16:54:30,093 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:54:30,330 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:30,331 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:30,377 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:30,435 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:30,494 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 55 proven. 16 refuted. 0 times theorem prover too weak. 106 trivial. 0 not checked. [2020-07-20 16:54:30,494 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1446878854] [2020-07-20 16:54:30,495 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:54:30,495 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-20 16:54:30,495 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1567953648] [2020-07-20 16:54:30,496 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 16:54:30,496 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:54:30,497 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 16:54:30,497 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-20 16:54:30,497 INFO L87 Difference]: Start difference. First operand 173 states and 306 transitions. Second operand 12 states. [2020-07-20 16:54:30,682 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:54:30,682 INFO L93 Difference]: Finished difference Result 191 states and 349 transitions. [2020-07-20 16:54:30,683 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 16:54:30,683 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 92 [2020-07-20 16:54:30,684 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:54:30,688 INFO L225 Difference]: With dead ends: 191 [2020-07-20 16:54:30,688 INFO L226 Difference]: Without dead ends: 187 [2020-07-20 16:54:30,689 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 169 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-20 16:54:30,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2020-07-20 16:54:30,706 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 176. [2020-07-20 16:54:30,706 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 176 states. [2020-07-20 16:54:30,709 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 316 transitions. [2020-07-20 16:54:30,709 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 316 transitions. Word has length 92 [2020-07-20 16:54:30,710 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:54:30,710 INFO L479 AbstractCegarLoop]: Abstraction has 176 states and 316 transitions. [2020-07-20 16:54:30,710 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 16:54:30,711 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 316 transitions. [2020-07-20 16:54:30,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-07-20 16:54:30,714 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:54:30,714 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 7, 7, 7, 5, 5, 5, 5, 5, 5, 5, 5, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:54:30,929 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:30,929 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:54:30,929 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:54:30,929 INFO L82 PathProgramCache]: Analyzing trace with hash -1258440967, now seen corresponding path program 3 times [2020-07-20 16:54:30,930 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:54:30,930 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [621318005] [2020-07-20 16:54:30,930 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:31,028 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:54:31,029 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:54:31,030 INFO L263 TraceCheckSpWp]: Trace formula consists of 230 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 16:54:31,034 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:54:31,130 INFO L134 CoverageAnalysis]: Checked inductivity of 329 backedges. 21 proven. 117 refuted. 0 times theorem prover too weak. 191 trivial. 0 not checked. [2020-07-20 16:54:31,130 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:54:31,844 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:32,031 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:32,146 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:32,201 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:32,204 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:32,253 INFO L134 CoverageAnalysis]: Checked inductivity of 329 backedges. 21 proven. 125 refuted. 0 times theorem prover too weak. 183 trivial. 0 not checked. [2020-07-20 16:54:32,254 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [621318005] [2020-07-20 16:54:32,254 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:54:32,254 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-20 16:54:32,254 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1580050673] [2020-07-20 16:54:32,255 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-20 16:54:32,255 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:54:32,256 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-20 16:54:32,256 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-20 16:54:32,256 INFO L87 Difference]: Start difference. First operand 176 states and 316 transitions. Second operand 16 states. [2020-07-20 16:54:32,511 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:54:32,512 INFO L93 Difference]: Finished difference Result 206 states and 384 transitions. [2020-07-20 16:54:32,512 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 16:54:32,513 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 117 [2020-07-20 16:54:32,513 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:54:32,517 INFO L225 Difference]: With dead ends: 206 [2020-07-20 16:54:32,517 INFO L226 Difference]: Without dead ends: 202 [2020-07-20 16:54:32,518 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 211 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-20 16:54:32,519 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2020-07-20 16:54:32,540 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 186. [2020-07-20 16:54:32,541 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 186 states. [2020-07-20 16:54:32,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 186 states to 186 states and 342 transitions. [2020-07-20 16:54:32,544 INFO L78 Accepts]: Start accepts. Automaton has 186 states and 342 transitions. Word has length 117 [2020-07-20 16:54:32,545 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:54:32,545 INFO L479 AbstractCegarLoop]: Abstraction has 186 states and 342 transitions. [2020-07-20 16:54:32,545 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-20 16:54:32,545 INFO L276 IsEmpty]: Start isEmpty. Operand 186 states and 342 transitions. [2020-07-20 16:54:32,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2020-07-20 16:54:32,550 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:54:32,550 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 7, 7, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:54:32,764 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:32,764 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:54:32,764 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:54:32,764 INFO L82 PathProgramCache]: Analyzing trace with hash -650257977, now seen corresponding path program 5 times [2020-07-20 16:54:32,765 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:54:32,765 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1287674497] [2020-07-20 16:54:32,765 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:32,854 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:54:32,854 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:54:32,856 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 16:54:32,858 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:54:32,954 INFO L134 CoverageAnalysis]: Checked inductivity of 341 backedges. 210 proven. 31 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2020-07-20 16:54:32,955 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:54:33,579 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:33,580 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:33,827 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:33,827 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:33,875 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:33,935 INFO L134 CoverageAnalysis]: Checked inductivity of 341 backedges. 51 proven. 126 refuted. 0 times theorem prover too weak. 164 trivial. 0 not checked. [2020-07-20 16:54:33,935 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1287674497] [2020-07-20 16:54:33,935 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:54:33,935 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 17 [2020-07-20 16:54:33,936 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1025216080] [2020-07-20 16:54:33,936 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 16:54:33,936 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:54:33,937 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 16:54:33,937 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2020-07-20 16:54:33,937 INFO L87 Difference]: Start difference. First operand 186 states and 342 transitions. Second operand 17 states. [2020-07-20 16:54:34,289 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:54:34,290 INFO L93 Difference]: Finished difference Result 376 states and 717 transitions. [2020-07-20 16:54:34,290 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 16:54:34,290 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 120 [2020-07-20 16:54:34,291 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:54:34,294 INFO L225 Difference]: With dead ends: 376 [2020-07-20 16:54:34,294 INFO L226 Difference]: Without dead ends: 192 [2020-07-20 16:54:34,297 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 249 GetRequests, 214 SyntacticMatches, 11 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=124, Invalid=526, Unknown=0, NotChecked=0, Total=650 [2020-07-20 16:54:34,298 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 192 states. [2020-07-20 16:54:34,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 192 to 190. [2020-07-20 16:54:34,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 190 states. [2020-07-20 16:54:34,314 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 336 transitions. [2020-07-20 16:54:34,315 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 336 transitions. Word has length 120 [2020-07-20 16:54:34,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:54:34,316 INFO L479 AbstractCegarLoop]: Abstraction has 190 states and 336 transitions. [2020-07-20 16:54:34,316 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 16:54:34,316 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 336 transitions. [2020-07-20 16:54:34,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 188 [2020-07-20 16:54:34,320 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:54:34,320 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 12, 12, 9, 9, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 6, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:54:34,534 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:34,535 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:54:34,535 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:54:34,535 INFO L82 PathProgramCache]: Analyzing trace with hash 1301266126, now seen corresponding path program 6 times [2020-07-20 16:54:34,535 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:54:34,536 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [43518546] [2020-07-20 16:54:34,536 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:34,651 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:54:34,651 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:54:34,653 INFO L263 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 16:54:34,658 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:54:34,818 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 145 proven. 298 refuted. 0 times theorem prover too weak. 457 trivial. 0 not checked. [2020-07-20 16:54:34,818 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:54:35,894 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:36,095 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:36,161 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:36,162 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:36,217 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:36,641 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:36,645 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:36,759 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:36,818 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:36,819 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:36,885 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 147 proven. 306 refuted. 0 times theorem prover too weak. 447 trivial. 0 not checked. [2020-07-20 16:54:36,886 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [43518546] [2020-07-20 16:54:36,886 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:54:36,886 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 19] total 25 [2020-07-20 16:54:36,886 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [86512070] [2020-07-20 16:54:36,887 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 16:54:36,887 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:54:36,887 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 16:54:36,888 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=525, Unknown=0, NotChecked=0, Total=600 [2020-07-20 16:54:36,888 INFO L87 Difference]: Start difference. First operand 190 states and 336 transitions. Second operand 25 states. [2020-07-20 16:54:38,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:54:38,137 INFO L93 Difference]: Finished difference Result 479 states and 998 transitions. [2020-07-20 16:54:38,138 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-07-20 16:54:38,138 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 187 [2020-07-20 16:54:38,138 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:54:38,145 INFO L225 Difference]: With dead ends: 479 [2020-07-20 16:54:38,145 INFO L226 Difference]: Without dead ends: 294 [2020-07-20 16:54:38,149 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 391 GetRequests, 335 SyntacticMatches, 15 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 284 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=306, Invalid=1500, Unknown=0, NotChecked=0, Total=1806 [2020-07-20 16:54:38,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 294 states. [2020-07-20 16:54:38,177 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 294 to 239. [2020-07-20 16:54:38,177 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 239 states. [2020-07-20 16:54:38,180 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 239 states to 239 states and 445 transitions. [2020-07-20 16:54:38,181 INFO L78 Accepts]: Start accepts. Automaton has 239 states and 445 transitions. Word has length 187 [2020-07-20 16:54:38,181 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:54:38,181 INFO L479 AbstractCegarLoop]: Abstraction has 239 states and 445 transitions. [2020-07-20 16:54:38,181 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 16:54:38,181 INFO L276 IsEmpty]: Start isEmpty. Operand 239 states and 445 transitions. [2020-07-20 16:54:38,185 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2020-07-20 16:54:38,185 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:54:38,185 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 8, 7, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:54:38,393 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:38,393 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:54:38,394 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:54:38,394 INFO L82 PathProgramCache]: Analyzing trace with hash 2011292190, now seen corresponding path program 7 times [2020-07-20 16:54:38,395 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:54:38,395 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1237891513] [2020-07-20 16:54:38,396 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:38,502 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:54:38,502 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:54:38,504 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 16:54:38,506 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:54:38,641 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 95 proven. 169 refuted. 0 times theorem prover too weak. 173 trivial. 0 not checked. [2020-07-20 16:54:38,642 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:54:39,368 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:39,467 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:39,530 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:39,942 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:40,048 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:40,114 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:40,216 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 95 proven. 179 refuted. 0 times theorem prover too weak. 163 trivial. 0 not checked. [2020-07-20 16:54:40,217 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1237891513] [2020-07-20 16:54:40,217 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:54:40,217 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 19] total 23 [2020-07-20 16:54:40,218 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1768795316] [2020-07-20 16:54:40,218 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 16:54:40,219 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:54:40,219 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 16:54:40,219 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=439, Unknown=0, NotChecked=0, Total=506 [2020-07-20 16:54:40,220 INFO L87 Difference]: Start difference. First operand 239 states and 445 transitions. Second operand 23 states. [2020-07-20 16:54:41,158 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:54:41,159 INFO L93 Difference]: Finished difference Result 491 states and 962 transitions. [2020-07-20 16:54:41,159 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-07-20 16:54:41,160 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 136 [2020-07-20 16:54:41,160 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:54:41,164 INFO L225 Difference]: With dead ends: 491 [2020-07-20 16:54:41,165 INFO L226 Difference]: Without dead ends: 257 [2020-07-20 16:54:41,169 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 296 GetRequests, 241 SyntacticMatches, 17 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 245 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=276, Invalid=1284, Unknown=0, NotChecked=0, Total=1560 [2020-07-20 16:54:41,170 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 257 states. [2020-07-20 16:54:41,187 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 257 to 238. [2020-07-20 16:54:41,187 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 238 states. [2020-07-20 16:54:41,190 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 238 states to 238 states and 446 transitions. [2020-07-20 16:54:41,191 INFO L78 Accepts]: Start accepts. Automaton has 238 states and 446 transitions. Word has length 136 [2020-07-20 16:54:41,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:54:41,191 INFO L479 AbstractCegarLoop]: Abstraction has 238 states and 446 transitions. [2020-07-20 16:54:41,192 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 16:54:41,192 INFO L276 IsEmpty]: Start isEmpty. Operand 238 states and 446 transitions. [2020-07-20 16:54:41,195 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2020-07-20 16:54:41,195 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:54:41,196 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 7, 6, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:54:41,409 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:41,410 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:54:41,411 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:54:41,411 INFO L82 PathProgramCache]: Analyzing trace with hash -400360989, now seen corresponding path program 8 times [2020-07-20 16:54:41,411 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:54:41,412 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [721516355] [2020-07-20 16:54:41,412 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:41,578 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:54:41,578 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:54:41,581 INFO L263 TraceCheckSpWp]: Trace formula consists of 186 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 16:54:41,585 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:54:41,777 INFO L134 CoverageAnalysis]: Checked inductivity of 340 backedges. 85 proven. 124 refuted. 0 times theorem prover too weak. 131 trivial. 0 not checked. [2020-07-20 16:54:41,778 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:54:42,493 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:42,553 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:42,555 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:42,602 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:43,017 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:43,145 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:43,212 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:43,213 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:43,261 INFO L134 CoverageAnalysis]: Checked inductivity of 340 backedges. 85 proven. 131 refuted. 0 times theorem prover too weak. 124 trivial. 0 not checked. [2020-07-20 16:54:43,261 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [721516355] [2020-07-20 16:54:43,261 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:54:43,261 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 17] total 21 [2020-07-20 16:54:43,262 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1291533144] [2020-07-20 16:54:43,262 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 16:54:43,263 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:54:43,263 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 16:54:43,263 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2020-07-20 16:54:43,263 INFO L87 Difference]: Start difference. First operand 238 states and 446 transitions. Second operand 21 states. [2020-07-20 16:54:44,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:54:44,228 INFO L93 Difference]: Finished difference Result 487 states and 959 transitions. [2020-07-20 16:54:44,233 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-07-20 16:54:44,233 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 122 [2020-07-20 16:54:44,234 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:54:44,240 INFO L225 Difference]: With dead ends: 487 [2020-07-20 16:54:44,241 INFO L226 Difference]: Without dead ends: 250 [2020-07-20 16:54:44,250 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 259 GetRequests, 209 SyntacticMatches, 15 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=241, Invalid=1091, Unknown=0, NotChecked=0, Total=1332 [2020-07-20 16:54:44,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 250 states. [2020-07-20 16:54:44,280 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 250 to 232. [2020-07-20 16:54:44,281 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 232 states. [2020-07-20 16:54:44,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 232 states to 232 states and 429 transitions. [2020-07-20 16:54:44,285 INFO L78 Accepts]: Start accepts. Automaton has 232 states and 429 transitions. Word has length 122 [2020-07-20 16:54:44,286 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:54:44,286 INFO L479 AbstractCegarLoop]: Abstraction has 232 states and 429 transitions. [2020-07-20 16:54:44,286 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 16:54:44,286 INFO L276 IsEmpty]: Start isEmpty. Operand 232 states and 429 transitions. [2020-07-20 16:54:44,291 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2020-07-20 16:54:44,291 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:54:44,291 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 7, 7, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:54:44,504 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:44,505 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:54:44,505 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:54:44,506 INFO L82 PathProgramCache]: Analyzing trace with hash -1245954009, now seen corresponding path program 9 times [2020-07-20 16:54:44,506 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:54:44,507 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1479950554] [2020-07-20 16:54:44,507 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:44,692 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:54:44,692 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:54:44,695 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 16:54:44,700 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:54:44,891 INFO L134 CoverageAnalysis]: Checked inductivity of 341 backedges. 78 proven. 124 refuted. 0 times theorem prover too weak. 139 trivial. 0 not checked. [2020-07-20 16:54:44,892 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:54:45,635 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:45,707 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:45,711 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:46,170 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:46,275 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:46,276 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:46,337 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:46,338 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:46,404 INFO L134 CoverageAnalysis]: Checked inductivity of 341 backedges. 78 proven. 130 refuted. 0 times theorem prover too weak. 133 trivial. 0 not checked. [2020-07-20 16:54:46,404 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1479950554] [2020-07-20 16:54:46,404 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:54:46,405 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 17] total 21 [2020-07-20 16:54:46,405 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1701753814] [2020-07-20 16:54:46,406 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 16:54:46,406 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:54:46,407 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 16:54:46,407 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=360, Unknown=0, NotChecked=0, Total=420 [2020-07-20 16:54:46,407 INFO L87 Difference]: Start difference. First operand 232 states and 429 transitions. Second operand 21 states. [2020-07-20 16:54:47,416 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:54:47,417 INFO L93 Difference]: Finished difference Result 471 states and 930 transitions. [2020-07-20 16:54:47,418 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-20 16:54:47,418 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 120 [2020-07-20 16:54:47,419 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:54:47,424 INFO L225 Difference]: With dead ends: 471 [2020-07-20 16:54:47,424 INFO L226 Difference]: Without dead ends: 243 [2020-07-20 16:54:47,429 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 257 GetRequests, 211 SyntacticMatches, 15 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 144 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=186, Invalid=870, Unknown=0, NotChecked=0, Total=1056 [2020-07-20 16:54:47,430 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 243 states. [2020-07-20 16:54:47,454 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 243 to 229. [2020-07-20 16:54:47,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 229 states. [2020-07-20 16:54:47,458 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 229 states to 229 states and 399 transitions. [2020-07-20 16:54:47,459 INFO L78 Accepts]: Start accepts. Automaton has 229 states and 399 transitions. Word has length 120 [2020-07-20 16:54:47,460 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:54:47,460 INFO L479 AbstractCegarLoop]: Abstraction has 229 states and 399 transitions. [2020-07-20 16:54:47,460 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 16:54:47,461 INFO L276 IsEmpty]: Start isEmpty. Operand 229 states and 399 transitions. [2020-07-20 16:54:47,466 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-20 16:54:47,466 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:54:47,466 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 6, 6, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:54:47,679 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:47,680 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:54:47,680 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:54:47,680 INFO L82 PathProgramCache]: Analyzing trace with hash 989968015, now seen corresponding path program 10 times [2020-07-20 16:54:47,681 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:54:47,681 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1593775232] [2020-07-20 16:54:47,681 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:47,831 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:54:47,832 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:54:47,833 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 16:54:47,836 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:54:47,940 INFO L134 CoverageAnalysis]: Checked inductivity of 334 backedges. 24 proven. 129 refuted. 0 times theorem prover too weak. 181 trivial. 0 not checked. [2020-07-20 16:54:47,941 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:54:48,707 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:48,887 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:48,989 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:48,990 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:49,042 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:49,090 INFO L134 CoverageAnalysis]: Checked inductivity of 334 backedges. 24 proven. 139 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2020-07-20 16:54:49,091 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1593775232] [2020-07-20 16:54:49,091 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:54:49,091 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-20 16:54:49,091 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1823727161] [2020-07-20 16:54:49,092 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 16:54:49,092 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:54:49,092 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 16:54:49,092 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-20 16:54:49,093 INFO L87 Difference]: Start difference. First operand 229 states and 399 transitions. Second operand 15 states. [2020-07-20 16:54:49,367 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:54:49,368 INFO L93 Difference]: Finished difference Result 236 states and 410 transitions. [2020-07-20 16:54:49,368 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 16:54:49,369 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 121 [2020-07-20 16:54:49,369 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:54:49,373 INFO L225 Difference]: With dead ends: 236 [2020-07-20 16:54:49,373 INFO L226 Difference]: Without dead ends: 232 [2020-07-20 16:54:49,374 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 246 GetRequests, 217 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-20 16:54:49,375 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 232 states. [2020-07-20 16:54:49,390 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 232 to 229. [2020-07-20 16:54:49,391 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 229 states. [2020-07-20 16:54:49,393 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 229 states to 229 states and 399 transitions. [2020-07-20 16:54:49,394 INFO L78 Accepts]: Start accepts. Automaton has 229 states and 399 transitions. Word has length 121 [2020-07-20 16:54:49,394 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:54:49,395 INFO L479 AbstractCegarLoop]: Abstraction has 229 states and 399 transitions. [2020-07-20 16:54:49,395 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 16:54:49,395 INFO L276 IsEmpty]: Start isEmpty. Operand 229 states and 399 transitions. [2020-07-20 16:54:49,401 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 306 [2020-07-20 16:54:49,402 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:54:49,402 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 22, 22, 15, 13, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 9, 8, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:54:49,617 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:49,618 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:54:49,618 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:54:49,619 INFO L82 PathProgramCache]: Analyzing trace with hash 1896631445, now seen corresponding path program 11 times [2020-07-20 16:54:49,619 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:54:49,619 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1314612444] [2020-07-20 16:54:49,620 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:49,780 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 16:54:49,781 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:54:49,783 INFO L263 TraceCheckSpWp]: Trace formula consists of 247 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 16:54:49,790 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:54:50,052 INFO L134 CoverageAnalysis]: Checked inductivity of 2559 backedges. 1434 proven. 202 refuted. 0 times theorem prover too weak. 923 trivial. 0 not checked. [2020-07-20 16:54:50,053 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:54:52,035 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:52,170 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:52,171 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:52,236 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:52,237 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:52,692 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:52,693 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:52,803 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:52,804 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:52,869 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:52,870 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:52,973 INFO L134 CoverageAnalysis]: Checked inductivity of 2559 backedges. 182 proven. 714 refuted. 0 times theorem prover too weak. 1663 trivial. 0 not checked. [2020-07-20 16:54:52,973 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1314612444] [2020-07-20 16:54:52,973 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:54:52,974 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 19] total 23 [2020-07-20 16:54:52,974 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2060045620] [2020-07-20 16:54:52,974 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 16:54:52,975 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:54:52,975 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 16:54:52,975 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=439, Unknown=0, NotChecked=0, Total=506 [2020-07-20 16:54:52,975 INFO L87 Difference]: Start difference. First operand 229 states and 399 transitions. Second operand 23 states. [2020-07-20 16:54:54,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:54:54,233 INFO L93 Difference]: Finished difference Result 499 states and 944 transitions. [2020-07-20 16:54:54,234 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-07-20 16:54:54,234 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 305 [2020-07-20 16:54:54,235 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:54:54,239 INFO L225 Difference]: With dead ends: 499 [2020-07-20 16:54:54,239 INFO L226 Difference]: Without dead ends: 271 [2020-07-20 16:54:54,243 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 627 GetRequests, 572 SyntacticMatches, 17 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 244 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=276, Invalid=1284, Unknown=0, NotChecked=0, Total=1560 [2020-07-20 16:54:54,244 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 271 states. [2020-07-20 16:54:54,261 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 271 to 235. [2020-07-20 16:54:54,262 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 235 states. [2020-07-20 16:54:54,265 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 235 states to 235 states and 402 transitions. [2020-07-20 16:54:54,266 INFO L78 Accepts]: Start accepts. Automaton has 235 states and 402 transitions. Word has length 305 [2020-07-20 16:54:54,267 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:54:54,267 INFO L479 AbstractCegarLoop]: Abstraction has 235 states and 402 transitions. [2020-07-20 16:54:54,267 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 16:54:54,267 INFO L276 IsEmpty]: Start isEmpty. Operand 235 states and 402 transitions. [2020-07-20 16:54:54,270 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-20 16:54:54,271 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:54:54,271 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 7, 7, 6, 6, 5, 5, 5, 5, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:54:54,484 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:54,485 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:54:54,486 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:54:54,486 INFO L82 PathProgramCache]: Analyzing trace with hash -1905629551, now seen corresponding path program 12 times [2020-07-20 16:54:54,487 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:54:54,487 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1210144783] [2020-07-20 16:54:54,488 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:54,651 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:54:54,651 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:54:54,653 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 16:54:54,656 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:54:54,754 INFO L134 CoverageAnalysis]: Checked inductivity of 346 backedges. 47 proven. 86 refuted. 0 times theorem prover too weak. 213 trivial. 0 not checked. [2020-07-20 16:54:54,755 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:54:55,230 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:55,354 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:55,356 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:55,407 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:55,462 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:55,506 INFO L134 CoverageAnalysis]: Checked inductivity of 346 backedges. 47 proven. 91 refuted. 0 times theorem prover too weak. 208 trivial. 0 not checked. [2020-07-20 16:54:55,507 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1210144783] [2020-07-20 16:54:55,507 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:54:55,507 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-20 16:54:55,507 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1165004801] [2020-07-20 16:54:55,508 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 16:54:55,508 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:54:55,508 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 16:54:55,509 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-20 16:54:55,509 INFO L87 Difference]: Start difference. First operand 235 states and 402 transitions. Second operand 13 states. [2020-07-20 16:54:55,750 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:54:55,750 INFO L93 Difference]: Finished difference Result 278 states and 502 transitions. [2020-07-20 16:54:55,751 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 16:54:55,752 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 121 [2020-07-20 16:54:55,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:54:55,757 INFO L225 Difference]: With dead ends: 278 [2020-07-20 16:54:55,757 INFO L226 Difference]: Without dead ends: 274 [2020-07-20 16:54:55,759 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 221 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-20 16:54:55,760 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 274 states. [2020-07-20 16:54:55,787 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 274 to 248. [2020-07-20 16:54:55,787 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 248 states. [2020-07-20 16:54:55,790 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 248 states to 248 states and 431 transitions. [2020-07-20 16:54:55,791 INFO L78 Accepts]: Start accepts. Automaton has 248 states and 431 transitions. Word has length 121 [2020-07-20 16:54:55,792 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:54:55,792 INFO L479 AbstractCegarLoop]: Abstraction has 248 states and 431 transitions. [2020-07-20 16:54:55,792 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 16:54:55,792 INFO L276 IsEmpty]: Start isEmpty. Operand 248 states and 431 transitions. [2020-07-20 16:54:55,796 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2020-07-20 16:54:55,797 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:54:55,797 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 9, 9, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 4, 4, 4, 4, 4, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:54:56,011 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:56,012 INFO L427 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:54:56,012 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:54:56,013 INFO L82 PathProgramCache]: Analyzing trace with hash 2023571201, now seen corresponding path program 2 times [2020-07-20 16:54:56,013 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:54:56,013 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1925936048] [2020-07-20 16:54:56,013 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:56,310 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:54:56,311 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:54:56,313 INFO L263 TraceCheckSpWp]: Trace formula consists of 283 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 16:54:56,318 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:54:56,413 INFO L134 CoverageAnalysis]: Checked inductivity of 522 backedges. 77 proven. 92 refuted. 0 times theorem prover too weak. 353 trivial. 0 not checked. [2020-07-20 16:54:56,414 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:54:56,960 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:57,054 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:57,107 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:57,107 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:57,166 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:57,254 INFO L134 CoverageAnalysis]: Checked inductivity of 522 backedges. 77 proven. 97 refuted. 0 times theorem prover too weak. 348 trivial. 0 not checked. [2020-07-20 16:54:57,254 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1925936048] [2020-07-20 16:54:57,255 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:54:57,255 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-20 16:54:57,255 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [643812694] [2020-07-20 16:54:57,255 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 16:54:57,255 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:54:57,256 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 16:54:57,256 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-20 16:54:57,256 INFO L87 Difference]: Start difference. First operand 248 states and 431 transitions. Second operand 13 states. [2020-07-20 16:54:57,461 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:54:57,461 INFO L93 Difference]: Finished difference Result 281 states and 518 transitions. [2020-07-20 16:54:57,462 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 16:54:57,462 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 145 [2020-07-20 16:54:57,463 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:54:57,469 INFO L225 Difference]: With dead ends: 281 [2020-07-20 16:54:57,469 INFO L226 Difference]: Without dead ends: 277 [2020-07-20 16:54:57,471 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 294 GetRequests, 270 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-20 16:54:57,472 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 277 states. [2020-07-20 16:54:57,491 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 277 to 248. [2020-07-20 16:54:57,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 248 states. [2020-07-20 16:54:57,495 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 248 states to 248 states and 431 transitions. [2020-07-20 16:54:57,495 INFO L78 Accepts]: Start accepts. Automaton has 248 states and 431 transitions. Word has length 145 [2020-07-20 16:54:57,496 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:54:57,496 INFO L479 AbstractCegarLoop]: Abstraction has 248 states and 431 transitions. [2020-07-20 16:54:57,496 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 16:54:57,496 INFO L276 IsEmpty]: Start isEmpty. Operand 248 states and 431 transitions. [2020-07-20 16:54:57,499 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2020-07-20 16:54:57,500 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:54:57,500 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:54:57,715 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:57,716 INFO L427 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:54:57,716 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:54:57,717 INFO L82 PathProgramCache]: Analyzing trace with hash 247206723, now seen corresponding path program 13 times [2020-07-20 16:54:57,717 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:54:57,717 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [596982079] [2020-07-20 16:54:57,718 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:57,894 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:54:57,895 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:54:57,897 INFO L263 TraceCheckSpWp]: Trace formula consists of 283 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 16:54:57,899 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:54:57,975 INFO L134 CoverageAnalysis]: Checked inductivity of 510 backedges. 134 proven. 31 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2020-07-20 16:54:57,975 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:54:58,449 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:58,450 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:58,568 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:58,622 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:58,739 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:58,939 INFO L134 CoverageAnalysis]: Checked inductivity of 510 backedges. 136 proven. 34 refuted. 0 times theorem prover too weak. 340 trivial. 0 not checked. [2020-07-20 16:54:58,939 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [596982079] [2020-07-20 16:54:58,939 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:54:58,939 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-20 16:54:58,940 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1686809857] [2020-07-20 16:54:58,940 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 16:54:58,940 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:54:58,940 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 16:54:58,940 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-20 16:54:58,940 INFO L87 Difference]: Start difference. First operand 248 states and 431 transitions. Second operand 13 states. [2020-07-20 16:54:59,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:54:59,144 INFO L93 Difference]: Finished difference Result 261 states and 450 transitions. [2020-07-20 16:54:59,145 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 16:54:59,145 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 145 [2020-07-20 16:54:59,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:54:59,148 INFO L225 Difference]: With dead ends: 261 [2020-07-20 16:54:59,149 INFO L226 Difference]: Without dead ends: 257 [2020-07-20 16:54:59,150 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 294 GetRequests, 270 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-20 16:54:59,151 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 257 states. [2020-07-20 16:54:59,168 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 257 to 248. [2020-07-20 16:54:59,169 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 248 states. [2020-07-20 16:54:59,172 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 248 states to 248 states and 431 transitions. [2020-07-20 16:54:59,172 INFO L78 Accepts]: Start accepts. Automaton has 248 states and 431 transitions. Word has length 145 [2020-07-20 16:54:59,173 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:54:59,173 INFO L479 AbstractCegarLoop]: Abstraction has 248 states and 431 transitions. [2020-07-20 16:54:59,173 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 16:54:59,173 INFO L276 IsEmpty]: Start isEmpty. Operand 248 states and 431 transitions. [2020-07-20 16:54:59,177 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 172 [2020-07-20 16:54:59,177 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:54:59,177 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 8, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:54:59,391 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:59,391 INFO L427 AbstractCegarLoop]: === Iteration 29 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:54:59,392 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:54:59,392 INFO L82 PathProgramCache]: Analyzing trace with hash -713059513, now seen corresponding path program 3 times [2020-07-20 16:54:59,392 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:54:59,393 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1749405523] [2020-07-20 16:54:59,393 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:59,570 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:54:59,571 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:54:59,572 INFO L263 TraceCheckSpWp]: Trace formula consists of 255 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 16:54:59,576 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:54:59,722 INFO L134 CoverageAnalysis]: Checked inductivity of 739 backedges. 434 proven. 86 refuted. 0 times theorem prover too weak. 219 trivial. 0 not checked. [2020-07-20 16:54:59,722 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:55:00,807 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:00,808 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:00,855 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:01,317 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:01,319 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:01,435 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:01,436 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:01,505 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:01,506 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:01,573 INFO L134 CoverageAnalysis]: Checked inductivity of 739 backedges. 99 proven. 235 refuted. 0 times theorem prover too weak. 405 trivial. 0 not checked. [2020-07-20 16:55:01,574 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1749405523] [2020-07-20 16:55:01,574 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:55:01,574 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 19 [2020-07-20 16:55:01,574 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [241309339] [2020-07-20 16:55:01,575 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 16:55:01,575 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:55:01,575 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 16:55:01,576 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-07-20 16:55:01,576 INFO L87 Difference]: Start difference. First operand 248 states and 431 transitions. Second operand 19 states. [2020-07-20 16:55:02,435 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:55:02,436 INFO L93 Difference]: Finished difference Result 527 states and 947 transitions. [2020-07-20 16:55:02,437 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-07-20 16:55:02,437 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 171 [2020-07-20 16:55:02,437 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:55:02,441 INFO L225 Difference]: With dead ends: 527 [2020-07-20 16:55:02,441 INFO L226 Difference]: Without dead ends: 285 [2020-07-20 16:55:02,445 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 353 GetRequests, 312 SyntacticMatches, 13 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=162, Invalid=708, Unknown=0, NotChecked=0, Total=870 [2020-07-20 16:55:02,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 285 states. [2020-07-20 16:55:02,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 285 to 251. [2020-07-20 16:55:02,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 251 states. [2020-07-20 16:55:02,467 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 251 states to 251 states and 436 transitions. [2020-07-20 16:55:02,467 INFO L78 Accepts]: Start accepts. Automaton has 251 states and 436 transitions. Word has length 171 [2020-07-20 16:55:02,468 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:55:02,468 INFO L479 AbstractCegarLoop]: Abstraction has 251 states and 436 transitions. [2020-07-20 16:55:02,468 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 16:55:02,468 INFO L276 IsEmpty]: Start isEmpty. Operand 251 states and 436 transitions. [2020-07-20 16:55:02,472 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 170 [2020-07-20 16:55:02,472 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:55:02,473 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:55:02,685 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:02,686 INFO L427 AbstractCegarLoop]: === Iteration 30 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:55:02,687 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:55:02,687 INFO L82 PathProgramCache]: Analyzing trace with hash -754125023, now seen corresponding path program 4 times [2020-07-20 16:55:02,687 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:55:02,688 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2041328245] [2020-07-20 16:55:02,688 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:02,884 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:55:02,884 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:55:02,886 INFO L263 TraceCheckSpWp]: Trace formula consists of 330 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 16:55:02,890 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:55:03,011 INFO L134 CoverageAnalysis]: Checked inductivity of 726 backedges. 45 proven. 235 refuted. 0 times theorem prover too weak. 446 trivial. 0 not checked. [2020-07-20 16:55:03,012 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:55:04,066 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:04,370 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:04,578 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:04,579 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:04,682 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:04,741 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:04,742 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:04,800 INFO L134 CoverageAnalysis]: Checked inductivity of 726 backedges. 45 proven. 249 refuted. 0 times theorem prover too weak. 432 trivial. 0 not checked. [2020-07-20 16:55:04,800 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2041328245] [2020-07-20 16:55:04,800 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:55:04,801 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-20 16:55:04,801 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1613216270] [2020-07-20 16:55:04,802 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 16:55:04,802 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:55:04,802 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 16:55:04,802 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-20 16:55:04,802 INFO L87 Difference]: Start difference. First operand 251 states and 436 transitions. Second operand 17 states. [2020-07-20 16:55:05,150 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:55:05,151 INFO L93 Difference]: Finished difference Result 271 states and 478 transitions. [2020-07-20 16:55:05,151 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 16:55:05,151 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 169 [2020-07-20 16:55:05,152 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:55:05,154 INFO L225 Difference]: With dead ends: 271 [2020-07-20 16:55:05,155 INFO L226 Difference]: Without dead ends: 267 [2020-07-20 16:55:05,156 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 345 GetRequests, 311 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-20 16:55:05,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 267 states. [2020-07-20 16:55:05,173 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 267 to 246. [2020-07-20 16:55:05,174 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 246 states. [2020-07-20 16:55:05,177 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 246 states to 246 states and 425 transitions. [2020-07-20 16:55:05,177 INFO L78 Accepts]: Start accepts. Automaton has 246 states and 425 transitions. Word has length 169 [2020-07-20 16:55:05,178 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:55:05,178 INFO L479 AbstractCegarLoop]: Abstraction has 246 states and 425 transitions. [2020-07-20 16:55:05,178 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 16:55:05,178 INFO L276 IsEmpty]: Start isEmpty. Operand 246 states and 425 transitions. [2020-07-20 16:55:05,182 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 173 [2020-07-20 16:55:05,182 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:55:05,183 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 8, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:55:05,396 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:05,397 INFO L427 AbstractCegarLoop]: === Iteration 31 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:55:05,397 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:55:05,397 INFO L82 PathProgramCache]: Analyzing trace with hash -755103851, now seen corresponding path program 14 times [2020-07-20 16:55:05,398 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:55:05,398 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1941706597] [2020-07-20 16:55:05,398 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:05,600 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:55:05,601 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:55:05,603 INFO L263 TraceCheckSpWp]: Trace formula consists of 256 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 16:55:05,607 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:55:05,746 INFO L134 CoverageAnalysis]: Checked inductivity of 745 backedges. 452 proven. 91 refuted. 0 times theorem prover too weak. 202 trivial. 0 not checked. [2020-07-20 16:55:05,747 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:55:06,914 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:06,915 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:06,980 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:07,448 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:07,559 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:07,560 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:07,621 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:07,682 INFO L134 CoverageAnalysis]: Checked inductivity of 745 backedges. 118 proven. 262 refuted. 0 times theorem prover too weak. 365 trivial. 0 not checked. [2020-07-20 16:55:07,682 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1941706597] [2020-07-20 16:55:07,682 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:55:07,683 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 17] total 21 [2020-07-20 16:55:07,683 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1142078200] [2020-07-20 16:55:07,683 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 16:55:07,683 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:55:07,684 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 16:55:07,684 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=360, Unknown=0, NotChecked=0, Total=420 [2020-07-20 16:55:07,684 INFO L87 Difference]: Start difference. First operand 246 states and 425 transitions. Second operand 21 states. [2020-07-20 16:55:08,480 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:55:08,480 INFO L93 Difference]: Finished difference Result 487 states and 885 transitions. [2020-07-20 16:55:08,481 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-20 16:55:08,481 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 172 [2020-07-20 16:55:08,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:55:08,484 INFO L225 Difference]: With dead ends: 487 [2020-07-20 16:55:08,485 INFO L226 Difference]: Without dead ends: 244 [2020-07-20 16:55:08,487 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 356 GetRequests, 310 SyntacticMatches, 15 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 144 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=186, Invalid=870, Unknown=0, NotChecked=0, Total=1056 [2020-07-20 16:55:08,488 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 244 states. [2020-07-20 16:55:08,501 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 244 to 236. [2020-07-20 16:55:08,501 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 236 states. [2020-07-20 16:55:08,503 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 236 states to 236 states and 398 transitions. [2020-07-20 16:55:08,503 INFO L78 Accepts]: Start accepts. Automaton has 236 states and 398 transitions. Word has length 172 [2020-07-20 16:55:08,504 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:55:08,504 INFO L479 AbstractCegarLoop]: Abstraction has 236 states and 398 transitions. [2020-07-20 16:55:08,504 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 16:55:08,504 INFO L276 IsEmpty]: Start isEmpty. Operand 236 states and 398 transitions. [2020-07-20 16:55:08,507 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 163 [2020-07-20 16:55:08,507 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:55:08,507 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 10, 10, 9, 8, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:55:08,722 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:08,723 INFO L427 AbstractCegarLoop]: === Iteration 32 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:55:08,723 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:55:08,723 INFO L82 PathProgramCache]: Analyzing trace with hash 1102006884, now seen corresponding path program 15 times [2020-07-20 16:55:08,723 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:55:08,723 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2002663009] [2020-07-20 16:55:08,724 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:08,913 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:55:08,914 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:55:08,915 INFO L263 TraceCheckSpWp]: Trace formula consists of 247 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 16:55:08,916 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:55:09,068 INFO L134 CoverageAnalysis]: Checked inductivity of 656 backedges. 168 proven. 206 refuted. 0 times theorem prover too weak. 282 trivial. 0 not checked. [2020-07-20 16:55:09,069 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:55:09,954 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:09,955 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:10,070 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:10,171 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:10,172 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:10,902 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:10,903 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:11,145 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:11,146 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:11,267 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:11,268 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:11,330 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:11,331 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:11,463 INFO L134 CoverageAnalysis]: Checked inductivity of 656 backedges. 168 proven. 220 refuted. 0 times theorem prover too weak. 268 trivial. 0 not checked. [2020-07-20 16:55:11,464 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2002663009] [2020-07-20 16:55:11,465 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:55:11,465 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 21] total 25 [2020-07-20 16:55:11,465 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [701546794] [2020-07-20 16:55:11,466 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 16:55:11,466 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:55:11,466 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 16:55:11,466 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=521, Unknown=0, NotChecked=0, Total=600 [2020-07-20 16:55:11,467 INFO L87 Difference]: Start difference. First operand 236 states and 398 transitions. Second operand 25 states. [2020-07-20 16:55:12,698 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:55:12,699 INFO L93 Difference]: Finished difference Result 497 states and 878 transitions. [2020-07-20 16:55:12,700 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-07-20 16:55:12,700 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 162 [2020-07-20 16:55:12,701 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:55:12,706 INFO L225 Difference]: With dead ends: 497 [2020-07-20 16:55:12,707 INFO L226 Difference]: Without dead ends: 266 [2020-07-20 16:55:12,711 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 338 GetRequests, 281 SyntacticMatches, 19 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 261 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=263, Invalid=1297, Unknown=0, NotChecked=0, Total=1560 [2020-07-20 16:55:12,712 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 266 states. [2020-07-20 16:55:12,728 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 266 to 244. [2020-07-20 16:55:12,729 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 244 states. [2020-07-20 16:55:12,731 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 244 states to 244 states and 390 transitions. [2020-07-20 16:55:12,732 INFO L78 Accepts]: Start accepts. Automaton has 244 states and 390 transitions. Word has length 162 [2020-07-20 16:55:12,732 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:55:12,732 INFO L479 AbstractCegarLoop]: Abstraction has 244 states and 390 transitions. [2020-07-20 16:55:12,732 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 16:55:12,732 INFO L276 IsEmpty]: Start isEmpty. Operand 244 states and 390 transitions. [2020-07-20 16:55:12,735 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 203 [2020-07-20 16:55:12,735 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:55:12,736 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 11, 10, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:55:12,950 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:12,951 INFO L427 AbstractCegarLoop]: === Iteration 33 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:55:12,952 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:55:12,952 INFO L82 PathProgramCache]: Analyzing trace with hash -1935704345, now seen corresponding path program 16 times [2020-07-20 16:55:12,953 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:55:12,953 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1167639394] [2020-07-20 16:55:12,953 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:13,197 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:55:13,197 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:55:13,199 INFO L263 TraceCheckSpWp]: Trace formula consists of 305 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 16:55:13,202 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:55:13,353 INFO L134 CoverageAnalysis]: Checked inductivity of 1052 backedges. 604 proven. 141 refuted. 0 times theorem prover too weak. 307 trivial. 0 not checked. [2020-07-20 16:55:13,353 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:55:14,583 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:14,650 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:14,741 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:15,249 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:15,357 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:15,420 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:15,421 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:15,491 INFO L134 CoverageAnalysis]: Checked inductivity of 1052 backedges. 156 proven. 325 refuted. 0 times theorem prover too weak. 571 trivial. 0 not checked. [2020-07-20 16:55:15,492 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1167639394] [2020-07-20 16:55:15,492 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:55:15,492 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 17] total 21 [2020-07-20 16:55:15,493 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [210624737] [2020-07-20 16:55:15,493 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 16:55:15,493 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:55:15,493 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 16:55:15,494 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2020-07-20 16:55:15,494 INFO L87 Difference]: Start difference. First operand 244 states and 390 transitions. Second operand 21 states. [2020-07-20 16:55:16,483 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:55:16,484 INFO L93 Difference]: Finished difference Result 508 states and 827 transitions. [2020-07-20 16:55:16,485 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-07-20 16:55:16,485 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 202 [2020-07-20 16:55:16,486 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:55:16,490 INFO L225 Difference]: With dead ends: 508 [2020-07-20 16:55:16,491 INFO L226 Difference]: Without dead ends: 270 [2020-07-20 16:55:16,495 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 417 GetRequests, 369 SyntacticMatches, 15 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 158 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=219, Invalid=971, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 16:55:16,496 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 270 states. [2020-07-20 16:55:16,515 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 270 to 244. [2020-07-20 16:55:16,516 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 244 states. [2020-07-20 16:55:16,518 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 244 states to 244 states and 389 transitions. [2020-07-20 16:55:16,521 INFO L78 Accepts]: Start accepts. Automaton has 244 states and 389 transitions. Word has length 202 [2020-07-20 16:55:16,522 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:55:16,522 INFO L479 AbstractCegarLoop]: Abstraction has 244 states and 389 transitions. [2020-07-20 16:55:16,522 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 16:55:16,522 INFO L276 IsEmpty]: Start isEmpty. Operand 244 states and 389 transitions. [2020-07-20 16:55:16,526 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 215 [2020-07-20 16:55:16,527 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:55:16,527 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 11, 10, 8, 8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 7, 6, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:55:16,741 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:16,742 INFO L427 AbstractCegarLoop]: === Iteration 34 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:55:16,742 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:55:16,743 INFO L82 PathProgramCache]: Analyzing trace with hash 2083859482, now seen corresponding path program 17 times [2020-07-20 16:55:16,743 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:55:16,743 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [619292787] [2020-07-20 16:55:16,744 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 35 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:17,004 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:55:17,005 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:55:17,007 INFO L263 TraceCheckSpWp]: Trace formula consists of 323 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 16:55:17,012 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:55:17,199 INFO L134 CoverageAnalysis]: Checked inductivity of 1196 backedges. 234 proven. 341 refuted. 0 times theorem prover too weak. 621 trivial. 0 not checked. [2020-07-20 16:55:17,199 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:55:18,412 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:18,626 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:18,717 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:18,790 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:19,603 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:19,822 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:19,823 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:19,938 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:20,007 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:20,008 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:20,086 INFO L134 CoverageAnalysis]: Checked inductivity of 1196 backedges. 234 proven. 356 refuted. 0 times theorem prover too weak. 606 trivial. 0 not checked. [2020-07-20 16:55:20,086 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [619292787] [2020-07-20 16:55:20,087 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:55:20,087 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 21] total 25 [2020-07-20 16:55:20,087 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [550619281] [2020-07-20 16:55:20,087 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 16:55:20,087 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:55:20,088 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 16:55:20,088 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=523, Unknown=0, NotChecked=0, Total=600 [2020-07-20 16:55:20,088 INFO L87 Difference]: Start difference. First operand 244 states and 389 transitions. Second operand 25 states. [2020-07-20 16:55:21,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:55:21,773 INFO L93 Difference]: Finished difference Result 588 states and 1005 transitions. [2020-07-20 16:55:21,774 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-07-20 16:55:21,774 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 214 [2020-07-20 16:55:21,775 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:55:21,779 INFO L225 Difference]: With dead ends: 588 [2020-07-20 16:55:21,779 INFO L226 Difference]: Without dead ends: 305 [2020-07-20 16:55:21,782 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 448 GetRequests, 385 SyntacticMatches, 19 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 362 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=348, Invalid=1722, Unknown=0, NotChecked=0, Total=2070 [2020-07-20 16:55:21,782 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 305 states. [2020-07-20 16:55:21,801 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 305 to 268. [2020-07-20 16:55:21,801 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 268 states. [2020-07-20 16:55:21,803 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 268 states to 268 states and 421 transitions. [2020-07-20 16:55:21,804 INFO L78 Accepts]: Start accepts. Automaton has 268 states and 421 transitions. Word has length 214 [2020-07-20 16:55:21,805 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:55:21,805 INFO L479 AbstractCegarLoop]: Abstraction has 268 states and 421 transitions. [2020-07-20 16:55:21,805 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 16:55:21,805 INFO L276 IsEmpty]: Start isEmpty. Operand 268 states and 421 transitions. [2020-07-20 16:55:21,808 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 202 [2020-07-20 16:55:21,808 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:55:21,808 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 13, 13, 10, 10, 8, 8, 8, 8, 8, 8, 8, 6, 6, 6, 6, 6, 6, 6, 6, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:55:22,021 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:22,022 INFO L427 AbstractCegarLoop]: === Iteration 35 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:55:22,023 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:55:22,023 INFO L82 PathProgramCache]: Analyzing trace with hash -2099788343, now seen corresponding path program 18 times [2020-07-20 16:55:22,023 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:55:22,024 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1260237798] [2020-07-20 16:55:22,024 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:22,300 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 16:55:22,300 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:55:22,302 INFO L263 TraceCheckSpWp]: Trace formula consists of 448 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-20 16:55:22,306 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:55:22,536 INFO L134 CoverageAnalysis]: Checked inductivity of 1054 backedges. 622 proven. 124 refuted. 0 times theorem prover too weak. 308 trivial. 0 not checked. [2020-07-20 16:55:22,537 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:55:24,024 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:24,131 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:24,680 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:24,803 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:24,804 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:24,921 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:25,045 INFO L134 CoverageAnalysis]: Checked inductivity of 1054 backedges. 132 proven. 356 refuted. 0 times theorem prover too weak. 566 trivial. 0 not checked. [2020-07-20 16:55:25,046 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1260237798] [2020-07-20 16:55:25,046 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:55:25,047 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 18] total 23 [2020-07-20 16:55:25,047 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1417314272] [2020-07-20 16:55:25,049 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 16:55:25,049 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:55:25,050 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 16:55:25,050 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=436, Unknown=0, NotChecked=0, Total=506 [2020-07-20 16:55:25,051 INFO L87 Difference]: Start difference. First operand 268 states and 421 transitions. Second operand 23 states. [2020-07-20 16:55:26,342 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:55:26,343 INFO L93 Difference]: Finished difference Result 524 states and 862 transitions. [2020-07-20 16:55:26,344 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-07-20 16:55:26,344 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 201 [2020-07-20 16:55:26,344 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:55:26,347 INFO L225 Difference]: With dead ends: 524 [2020-07-20 16:55:26,347 INFO L226 Difference]: Without dead ends: 260 [2020-07-20 16:55:26,350 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 418 GetRequests, 365 SyntacticMatches, 15 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 229 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=291, Invalid=1269, Unknown=0, NotChecked=0, Total=1560 [2020-07-20 16:55:26,350 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 260 states. [2020-07-20 16:55:26,373 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 260 to 231. [2020-07-20 16:55:26,374 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 231 states. [2020-07-20 16:55:26,376 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 231 states to 231 states and 351 transitions. [2020-07-20 16:55:26,376 INFO L78 Accepts]: Start accepts. Automaton has 231 states and 351 transitions. Word has length 201 [2020-07-20 16:55:26,377 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:55:26,377 INFO L479 AbstractCegarLoop]: Abstraction has 231 states and 351 transitions. [2020-07-20 16:55:26,377 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 16:55:26,377 INFO L276 IsEmpty]: Start isEmpty. Operand 231 states and 351 transitions. [2020-07-20 16:55:26,379 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2020-07-20 16:55:26,380 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:55:26,380 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 10, 10, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:55:26,593 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:26,594 INFO L427 AbstractCegarLoop]: === Iteration 36 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:55:26,595 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:55:26,595 INFO L82 PathProgramCache]: Analyzing trace with hash 307857833, now seen corresponding path program 19 times [2020-07-20 16:55:26,595 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:55:26,596 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1146731108] [2020-07-20 16:55:26,596 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 37 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:26,907 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 16:55:26,907 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:55:26,911 INFO L263 TraceCheckSpWp]: Trace formula consists of 394 conjuncts, 103 conjunts are in the unsatisfiable core [2020-07-20 16:55:26,914 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:55:27,476 INFO L134 CoverageAnalysis]: Checked inductivity of 786 backedges. 0 proven. 267 refuted. 0 times theorem prover too weak. 519 trivial. 0 not checked. [2020-07-20 16:55:27,477 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:55:30,184 INFO L134 CoverageAnalysis]: Checked inductivity of 786 backedges. 0 proven. 267 refuted. 0 times theorem prover too weak. 519 trivial. 0 not checked. [2020-07-20 16:55:30,185 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1146731108] [2020-07-20 16:55:30,185 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:55:30,186 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28] total 36 [2020-07-20 16:55:30,186 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1195507539] [2020-07-20 16:55:30,187 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-07-20 16:55:30,187 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:55:30,187 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-07-20 16:55:30,188 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=1175, Unknown=0, NotChecked=0, Total=1260 [2020-07-20 16:55:30,188 INFO L87 Difference]: Start difference. First operand 231 states and 351 transitions. Second operand 36 states. [2020-07-20 16:55:31,001 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:55:31,001 INFO L93 Difference]: Finished difference Result 253 states and 392 transitions. [2020-07-20 16:55:31,002 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-07-20 16:55:31,002 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 177 [2020-07-20 16:55:31,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:55:31,005 INFO L225 Difference]: With dead ends: 253 [2020-07-20 16:55:31,006 INFO L226 Difference]: Without dead ends: 249 [2020-07-20 16:55:31,007 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 353 GetRequests, 319 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 188 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=85, Invalid=1175, Unknown=0, NotChecked=0, Total=1260 [2020-07-20 16:55:31,008 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 249 states. [2020-07-20 16:55:31,023 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 249 to 244. [2020-07-20 16:55:31,023 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 244 states. [2020-07-20 16:55:31,024 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 244 states to 244 states and 381 transitions. [2020-07-20 16:55:31,025 INFO L78 Accepts]: Start accepts. Automaton has 244 states and 381 transitions. Word has length 177 [2020-07-20 16:55:31,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:55:31,025 INFO L479 AbstractCegarLoop]: Abstraction has 244 states and 381 transitions. [2020-07-20 16:55:31,025 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-07-20 16:55:31,025 INFO L276 IsEmpty]: Start isEmpty. Operand 244 states and 381 transitions. [2020-07-20 16:55:31,027 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2020-07-20 16:55:31,027 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:55:31,027 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 12, 12, 10, 10, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 5, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:55:31,228 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:31,229 INFO L427 AbstractCegarLoop]: === Iteration 37 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:55:31,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:55:31,229 INFO L82 PathProgramCache]: Analyzing trace with hash -140375518, now seen corresponding path program 20 times [2020-07-20 16:55:31,230 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:55:31,230 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1556588663] [2020-07-20 16:55:31,231 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 38 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:31,552 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 16:55:31,552 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:55:31,555 INFO L263 TraceCheckSpWp]: Trace formula consists of 421 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-20 16:55:31,558 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:55:31,783 INFO L134 CoverageAnalysis]: Checked inductivity of 918 backedges. 180 proven. 268 refuted. 0 times theorem prover too weak. 470 trivial. 0 not checked. [2020-07-20 16:55:31,783 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:55:32,869 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:32,977 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:33,093 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:34,004 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:34,004 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:34,220 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:34,347 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:34,347 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:34,420 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:34,503 INFO L134 CoverageAnalysis]: Checked inductivity of 918 backedges. 179 proven. 280 refuted. 0 times theorem prover too weak. 459 trivial. 0 not checked. [2020-07-20 16:55:34,503 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1556588663] [2020-07-20 16:55:34,503 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:55:34,503 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 20] total 25 [2020-07-20 16:55:34,503 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [998637640] [2020-07-20 16:55:34,504 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 16:55:34,504 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:55:34,505 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 16:55:34,505 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=520, Unknown=0, NotChecked=0, Total=600 [2020-07-20 16:55:34,505 INFO L87 Difference]: Start difference. First operand 244 states and 381 transitions. Second operand 25 states. [2020-07-20 16:55:35,659 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:55:35,659 INFO L93 Difference]: Finished difference Result 496 states and 794 transitions. [2020-07-20 16:55:35,660 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-07-20 16:55:35,661 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 189 [2020-07-20 16:55:35,661 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:55:35,663 INFO L225 Difference]: With dead ends: 496 [2020-07-20 16:55:35,664 INFO L226 Difference]: Without dead ends: 258 [2020-07-20 16:55:35,666 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 396 GetRequests, 337 SyntacticMatches, 17 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 307 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=348, Invalid=1544, Unknown=0, NotChecked=0, Total=1892 [2020-07-20 16:55:35,667 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 258 states. [2020-07-20 16:55:35,681 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 258 to 247. [2020-07-20 16:55:35,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 247 states. [2020-07-20 16:55:35,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 247 states to 247 states and 387 transitions. [2020-07-20 16:55:35,685 INFO L78 Accepts]: Start accepts. Automaton has 247 states and 387 transitions. Word has length 189 [2020-07-20 16:55:35,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:55:35,685 INFO L479 AbstractCegarLoop]: Abstraction has 247 states and 387 transitions. [2020-07-20 16:55:35,685 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 16:55:35,685 INFO L276 IsEmpty]: Start isEmpty. Operand 247 states and 387 transitions. [2020-07-20 16:55:35,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2020-07-20 16:55:35,688 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:55:35,689 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 12, 12, 10, 10, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 5, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:55:35,903 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:35,904 INFO L427 AbstractCegarLoop]: === Iteration 38 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:55:35,904 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:55:35,904 INFO L82 PathProgramCache]: Analyzing trace with hash 1838391522, now seen corresponding path program 21 times [2020-07-20 16:55:35,905 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:55:35,905 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [191029046] [2020-07-20 16:55:35,905 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 39 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:36,238 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 16:55:36,239 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:55:36,242 INFO L263 TraceCheckSpWp]: Trace formula consists of 421 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-20 16:55:36,246 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:55:36,482 INFO L134 CoverageAnalysis]: Checked inductivity of 918 backedges. 167 proven. 281 refuted. 0 times theorem prover too weak. 470 trivial. 0 not checked. [2020-07-20 16:55:36,482 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:55:37,534 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:37,535 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:37,637 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:37,638 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:37,737 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:38,527 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:38,752 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:38,874 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:38,953 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:39,038 INFO L134 CoverageAnalysis]: Checked inductivity of 918 backedges. 166 proven. 293 refuted. 0 times theorem prover too weak. 459 trivial. 0 not checked. [2020-07-20 16:55:39,039 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [191029046] [2020-07-20 16:55:39,039 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:55:39,039 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 20] total 25 [2020-07-20 16:55:39,039 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2069322484] [2020-07-20 16:55:39,040 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 16:55:39,040 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:55:39,041 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 16:55:39,041 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=520, Unknown=0, NotChecked=0, Total=600 [2020-07-20 16:55:39,041 INFO L87 Difference]: Start difference. First operand 247 states and 387 transitions. Second operand 25 states. [2020-07-20 16:55:40,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:55:40,497 INFO L93 Difference]: Finished difference Result 493 states and 795 transitions. [2020-07-20 16:55:40,500 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-07-20 16:55:40,500 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 189 [2020-07-20 16:55:40,500 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:55:40,503 INFO L225 Difference]: With dead ends: 493 [2020-07-20 16:55:40,503 INFO L226 Difference]: Without dead ends: 252 [2020-07-20 16:55:40,505 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 398 GetRequests, 337 SyntacticMatches, 17 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 346 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=371, Invalid=1699, Unknown=0, NotChecked=0, Total=2070 [2020-07-20 16:55:40,506 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 252 states. [2020-07-20 16:55:40,520 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 252 to 239. [2020-07-20 16:55:40,521 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 239 states. [2020-07-20 16:55:40,522 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 239 states to 239 states and 365 transitions. [2020-07-20 16:55:40,523 INFO L78 Accepts]: Start accepts. Automaton has 239 states and 365 transitions. Word has length 189 [2020-07-20 16:55:40,524 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:55:40,524 INFO L479 AbstractCegarLoop]: Abstraction has 239 states and 365 transitions. [2020-07-20 16:55:40,524 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 16:55:40,524 INFO L276 IsEmpty]: Start isEmpty. Operand 239 states and 365 transitions. [2020-07-20 16:55:40,527 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 250 [2020-07-20 16:55:40,527 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:55:40,527 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 16, 16, 11, 10, 10, 10, 10, 10, 10, 10, 10, 10, 8, 8, 8, 8, 8, 8, 8, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:55:40,741 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:40,741 INFO L427 AbstractCegarLoop]: === Iteration 39 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:55:40,742 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:55:40,742 INFO L82 PathProgramCache]: Analyzing trace with hash 2146047195, now seen corresponding path program 5 times [2020-07-20 16:55:40,742 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:55:40,743 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [445588723] [2020-07-20 16:55:40,743 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 40 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:41,066 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:55:41,067 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:55:41,069 INFO L263 TraceCheckSpWp]: Trace formula consists of 484 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-20 16:55:41,073 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:55:41,189 INFO L134 CoverageAnalysis]: Checked inductivity of 1702 backedges. 637 proven. 11 refuted. 0 times theorem prover too weak. 1054 trivial. 0 not checked. [2020-07-20 16:55:41,189 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:55:42,663 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:42,664 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:42,744 INFO L134 CoverageAnalysis]: Checked inductivity of 1702 backedges. 120 proven. 326 refuted. 0 times theorem prover too weak. 1256 trivial. 0 not checked. [2020-07-20 16:55:42,745 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [445588723] [2020-07-20 16:55:42,745 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:55:42,745 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 14 [2020-07-20 16:55:42,745 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1100348072] [2020-07-20 16:55:42,746 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 16:55:42,746 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:55:42,746 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 16:55:42,746 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-07-20 16:55:42,746 INFO L87 Difference]: Start difference. First operand 239 states and 365 transitions. Second operand 14 states. [2020-07-20 16:55:42,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:55:42,968 INFO L93 Difference]: Finished difference Result 449 states and 700 transitions. [2020-07-20 16:55:42,969 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 16:55:42,969 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 249 [2020-07-20 16:55:42,970 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:55:42,973 INFO L225 Difference]: With dead ends: 449 [2020-07-20 16:55:42,973 INFO L226 Difference]: Without dead ends: 216 [2020-07-20 16:55:42,974 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 502 GetRequests, 478 SyntacticMatches, 7 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=74, Invalid=268, Unknown=0, NotChecked=0, Total=342 [2020-07-20 16:55:42,975 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 216 states. [2020-07-20 16:55:42,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 216 to 216. [2020-07-20 16:55:42,985 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 216 states. [2020-07-20 16:55:42,986 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 216 states to 216 states and 323 transitions. [2020-07-20 16:55:42,986 INFO L78 Accepts]: Start accepts. Automaton has 216 states and 323 transitions. Word has length 249 [2020-07-20 16:55:42,986 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:55:42,987 INFO L479 AbstractCegarLoop]: Abstraction has 216 states and 323 transitions. [2020-07-20 16:55:42,987 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 16:55:42,987 INFO L276 IsEmpty]: Start isEmpty. Operand 216 states and 323 transitions. [2020-07-20 16:55:42,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 477 [2020-07-20 16:55:42,990 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:55:42,991 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 34, 34, 23, 20, 18, 18, 18, 18, 18, 18, 18, 17, 17, 17, 17, 17, 17, 17, 14, 14, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:55:43,205 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:43,206 INFO L427 AbstractCegarLoop]: === Iteration 40 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:55:43,206 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:55:43,207 INFO L82 PathProgramCache]: Analyzing trace with hash -2026726594, now seen corresponding path program 22 times [2020-07-20 16:55:43,207 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:55:43,208 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [504734815] [2020-07-20 16:55:43,208 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 41 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:43,547 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 16:55:43,547 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:55:43,550 INFO L263 TraceCheckSpWp]: Trace formula consists of 376 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 16:55:43,556 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:55:43,835 INFO L134 CoverageAnalysis]: Checked inductivity of 6507 backedges. 3642 proven. 305 refuted. 0 times theorem prover too weak. 2560 trivial. 0 not checked. [2020-07-20 16:55:43,835 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:55:47,163 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:47,164 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:47,424 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:47,551 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:47,552 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:47,635 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:47,726 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:48,311 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:48,312 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:48,393 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:48,495 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:48,679 INFO L134 CoverageAnalysis]: Checked inductivity of 6507 backedges. 423 proven. 1104 refuted. 0 times theorem prover too weak. 4980 trivial. 0 not checked. [2020-07-20 16:55:48,680 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [504734815] [2020-07-20 16:55:48,680 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:55:48,681 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 19] total 25 [2020-07-20 16:55:48,681 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [797979458] [2020-07-20 16:55:48,682 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 16:55:48,682 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:55:48,682 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 16:55:48,683 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=523, Unknown=0, NotChecked=0, Total=600 [2020-07-20 16:55:48,683 INFO L87 Difference]: Start difference. First operand 216 states and 323 transitions. Second operand 25 states. [2020-07-20 16:55:50,538 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:55:50,538 INFO L93 Difference]: Finished difference Result 527 states and 870 transitions. [2020-07-20 16:55:50,539 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-07-20 16:55:50,539 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 476 [2020-07-20 16:55:50,540 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:55:50,544 INFO L225 Difference]: With dead ends: 527 [2020-07-20 16:55:50,545 INFO L226 Difference]: Without dead ends: 286 [2020-07-20 16:55:50,548 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 972 GetRequests, 913 SyntacticMatches, 15 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 355 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=354, Invalid=1716, Unknown=0, NotChecked=0, Total=2070 [2020-07-20 16:55:50,549 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 286 states. [2020-07-20 16:55:50,566 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 286 to 254. [2020-07-20 16:55:50,566 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 254 states. [2020-07-20 16:55:50,568 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 254 states to 254 states and 402 transitions. [2020-07-20 16:55:50,569 INFO L78 Accepts]: Start accepts. Automaton has 254 states and 402 transitions. Word has length 476 [2020-07-20 16:55:50,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:55:50,570 INFO L479 AbstractCegarLoop]: Abstraction has 254 states and 402 transitions. [2020-07-20 16:55:50,570 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 16:55:50,570 INFO L276 IsEmpty]: Start isEmpty. Operand 254 states and 402 transitions. [2020-07-20 16:55:50,572 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 238 [2020-07-20 16:55:50,573 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:55:50,573 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 14, 14, 11, 10, 10, 10, 10, 10, 10, 10, 10, 10, 7, 7, 7, 7, 7, 7, 7, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:55:50,774 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:50,774 INFO L427 AbstractCegarLoop]: === Iteration 41 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:55:50,775 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:55:50,775 INFO L82 PathProgramCache]: Analyzing trace with hash -681984220, now seen corresponding path program 6 times [2020-07-20 16:55:50,775 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:55:50,776 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [413005663] [2020-07-20 16:55:50,776 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 42 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:51,118 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:55:51,118 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:55:51,121 INFO L263 TraceCheckSpWp]: Trace formula consists of 461 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-20 16:55:51,124 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:55:51,296 INFO L134 CoverageAnalysis]: Checked inductivity of 1558 backedges. 820 proven. 51 refuted. 0 times theorem prover too weak. 687 trivial. 0 not checked. [2020-07-20 16:55:51,297 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:55:52,801 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:53,373 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:53,374 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:53,506 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:53,630 INFO L134 CoverageAnalysis]: Checked inductivity of 1558 backedges. 147 proven. 371 refuted. 0 times theorem prover too weak. 1040 trivial. 0 not checked. [2020-07-20 16:55:53,630 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [413005663] [2020-07-20 16:55:53,631 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:55:53,631 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14] total 19 [2020-07-20 16:55:53,631 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1534238885] [2020-07-20 16:55:53,632 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 16:55:53,632 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:55:53,632 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 16:55:53,633 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=287, Unknown=0, NotChecked=0, Total=342 [2020-07-20 16:55:53,633 INFO L87 Difference]: Start difference. First operand 254 states and 402 transitions. Second operand 19 states. [2020-07-20 16:55:54,339 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:55:54,339 INFO L93 Difference]: Finished difference Result 480 states and 777 transitions. [2020-07-20 16:55:54,340 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 16:55:54,341 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 237 [2020-07-20 16:55:54,341 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:55:54,344 INFO L225 Difference]: With dead ends: 480 [2020-07-20 16:55:54,345 INFO L226 Difference]: Without dead ends: 232 [2020-07-20 16:55:54,347 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 485 GetRequests, 446 SyntacticMatches, 11 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 105 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=168, Invalid=702, Unknown=0, NotChecked=0, Total=870 [2020-07-20 16:55:54,347 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 232 states. [2020-07-20 16:55:54,362 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 232 to 230. [2020-07-20 16:55:54,362 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 230 states. [2020-07-20 16:55:54,364 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 230 states to 230 states and 354 transitions. [2020-07-20 16:55:54,365 INFO L78 Accepts]: Start accepts. Automaton has 230 states and 354 transitions. Word has length 237 [2020-07-20 16:55:54,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:55:54,365 INFO L479 AbstractCegarLoop]: Abstraction has 230 states and 354 transitions. [2020-07-20 16:55:54,366 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 16:55:54,366 INFO L276 IsEmpty]: Start isEmpty. Operand 230 states and 354 transitions. [2020-07-20 16:55:54,369 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 364 [2020-07-20 16:55:54,369 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:55:54,370 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 25, 25, 19, 19, 14, 14, 14, 14, 14, 14, 14, 12, 12, 12, 12, 12, 12, 12, 9, 7, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:55:54,583 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:54,583 INFO L427 AbstractCegarLoop]: === Iteration 42 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:55:54,584 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:55:54,584 INFO L82 PathProgramCache]: Analyzing trace with hash -1493839085, now seen corresponding path program 23 times [2020-07-20 16:55:54,584 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:55:54,585 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1410728936] [2020-07-20 16:55:54,585 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 43 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:54,983 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:55:54,984 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:55:54,986 INFO L263 TraceCheckSpWp]: Trace formula consists of 543 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 16:55:54,991 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:55:55,290 INFO L134 CoverageAnalysis]: Checked inductivity of 3682 backedges. 2061 proven. 390 refuted. 0 times theorem prover too weak. 1231 trivial. 0 not checked. [2020-07-20 16:55:55,290 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:55:58,476 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:58,477 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:58,771 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:58,923 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:58,924 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:59,021 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:59,978 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:00,261 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:00,397 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:00,399 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:00,481 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:00,620 INFO L134 CoverageAnalysis]: Checked inductivity of 3682 backedges. 302 proven. 1003 refuted. 0 times theorem prover too weak. 2377 trivial. 0 not checked. [2020-07-20 16:56:00,620 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1410728936] [2020-07-20 16:56:00,620 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:56:00,621 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 23] total 29 [2020-07-20 16:56:00,621 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1794777279] [2020-07-20 16:56:00,621 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-20 16:56:00,621 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:00,622 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-20 16:56:00,622 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=716, Unknown=0, NotChecked=0, Total=812 [2020-07-20 16:56:00,622 INFO L87 Difference]: Start difference. First operand 230 states and 354 transitions. Second operand 29 states. [2020-07-20 16:56:01,848 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:01,849 INFO L93 Difference]: Finished difference Result 521 states and 875 transitions. [2020-07-20 16:56:01,849 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-07-20 16:56:01,850 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 363 [2020-07-20 16:56:01,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:01,852 INFO L225 Difference]: With dead ends: 521 [2020-07-20 16:56:01,853 INFO L226 Difference]: Without dead ends: 297 [2020-07-20 16:56:01,855 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 743 GetRequests, 679 SyntacticMatches, 19 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 391 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=341, Invalid=1821, Unknown=0, NotChecked=0, Total=2162 [2020-07-20 16:56:01,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 297 states. [2020-07-20 16:56:01,868 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 297 to 247. [2020-07-20 16:56:01,868 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 247 states. [2020-07-20 16:56:01,870 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 247 states to 247 states and 394 transitions. [2020-07-20 16:56:01,870 INFO L78 Accepts]: Start accepts. Automaton has 247 states and 394 transitions. Word has length 363 [2020-07-20 16:56:01,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:01,871 INFO L479 AbstractCegarLoop]: Abstraction has 247 states and 394 transitions. [2020-07-20 16:56:01,871 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-20 16:56:01,871 INFO L276 IsEmpty]: Start isEmpty. Operand 247 states and 394 transitions. [2020-07-20 16:56:01,873 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 250 [2020-07-20 16:56:01,873 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:01,874 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 16, 16, 11, 10, 10, 10, 10, 10, 10, 10, 10, 10, 8, 8, 8, 8, 8, 8, 8, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:02,086 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:02,087 INFO L427 AbstractCegarLoop]: === Iteration 43 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:02,088 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:02,088 INFO L82 PathProgramCache]: Analyzing trace with hash 1491534157, now seen corresponding path program 7 times [2020-07-20 16:56:02,088 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:02,089 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [530405774] [2020-07-20 16:56:02,089 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 44 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:02,453 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:56:02,453 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:02,456 INFO L263 TraceCheckSpWp]: Trace formula consists of 484 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-20 16:56:02,460 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:02,699 INFO L134 CoverageAnalysis]: Checked inductivity of 1702 backedges. 981 proven. 177 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2020-07-20 16:56:02,700 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:56:04,486 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:04,578 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:05,363 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:05,364 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:05,586 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:05,710 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:05,711 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:05,868 INFO L134 CoverageAnalysis]: Checked inductivity of 1702 backedges. 209 proven. 447 refuted. 0 times theorem prover too weak. 1046 trivial. 0 not checked. [2020-07-20 16:56:05,869 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [530405774] [2020-07-20 16:56:05,869 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:56:05,869 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 18] total 23 [2020-07-20 16:56:05,869 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2108310022] [2020-07-20 16:56:05,870 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 16:56:05,870 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:05,871 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 16:56:05,871 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=435, Unknown=0, NotChecked=0, Total=506 [2020-07-20 16:56:05,871 INFO L87 Difference]: Start difference. First operand 247 states and 394 transitions. Second operand 23 states. [2020-07-20 16:56:07,039 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:07,040 INFO L93 Difference]: Finished difference Result 481 states and 800 transitions. [2020-07-20 16:56:07,041 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-07-20 16:56:07,041 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 249 [2020-07-20 16:56:07,041 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:07,044 INFO L225 Difference]: With dead ends: 481 [2020-07-20 16:56:07,044 INFO L226 Difference]: Without dead ends: 239 [2020-07-20 16:56:07,047 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 512 GetRequests, 462 SyntacticMatches, 15 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 208 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=233, Invalid=1099, Unknown=0, NotChecked=0, Total=1332 [2020-07-20 16:56:07,048 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 239 states. [2020-07-20 16:56:07,064 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 239 to 231. [2020-07-20 16:56:07,064 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 231 states. [2020-07-20 16:56:07,066 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 231 states to 231 states and 363 transitions. [2020-07-20 16:56:07,067 INFO L78 Accepts]: Start accepts. Automaton has 231 states and 363 transitions. Word has length 249 [2020-07-20 16:56:07,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:07,068 INFO L479 AbstractCegarLoop]: Abstraction has 231 states and 363 transitions. [2020-07-20 16:56:07,068 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 16:56:07,068 INFO L276 IsEmpty]: Start isEmpty. Operand 231 states and 363 transitions. [2020-07-20 16:56:07,072 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 417 [2020-07-20 16:56:07,073 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:07,073 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 29, 29, 20, 17, 17, 17, 17, 17, 17, 17, 17, 14, 14, 14, 14, 14, 14, 14, 14, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:07,287 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:07,288 INFO L427 AbstractCegarLoop]: === Iteration 44 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:07,288 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:07,289 INFO L82 PathProgramCache]: Analyzing trace with hash 969019326, now seen corresponding path program 5 times [2020-07-20 16:56:07,290 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:07,290 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1601983428] [2020-07-20 16:56:07,291 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 45 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:07,785 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:56:07,786 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:07,791 INFO L263 TraceCheckSpWp]: Trace formula consists of 804 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 16:56:07,799 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:08,063 INFO L134 CoverageAnalysis]: Checked inductivity of 5003 backedges. 326 proven. 596 refuted. 0 times theorem prover too weak. 4081 trivial. 0 not checked. [2020-07-20 16:56:08,064 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:56:10,335 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:10,687 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:10,688 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:10,961 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:10,962 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:11,127 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:11,219 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:11,349 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:11,672 INFO L134 CoverageAnalysis]: Checked inductivity of 5003 backedges. 326 proven. 610 refuted. 0 times theorem prover too weak. 4067 trivial. 0 not checked. [2020-07-20 16:56:11,673 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1601983428] [2020-07-20 16:56:11,673 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:56:11,673 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-20 16:56:11,673 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [572979904] [2020-07-20 16:56:11,674 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 16:56:11,674 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:11,674 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 16:56:11,675 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-20 16:56:11,675 INFO L87 Difference]: Start difference. First operand 231 states and 363 transitions. Second operand 17 states. [2020-07-20 16:56:12,139 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:12,139 INFO L93 Difference]: Finished difference Result 245 states and 399 transitions. [2020-07-20 16:56:12,140 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 16:56:12,141 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 416 [2020-07-20 16:56:12,142 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:12,144 INFO L225 Difference]: With dead ends: 245 [2020-07-20 16:56:12,144 INFO L226 Difference]: Without dead ends: 231 [2020-07-20 16:56:12,145 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 838 GetRequests, 804 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-20 16:56:12,146 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 231 states. [2020-07-20 16:56:12,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 231 to 211. [2020-07-20 16:56:12,157 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 211 states. [2020-07-20 16:56:12,158 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 211 states to 211 states and 304 transitions. [2020-07-20 16:56:12,159 INFO L78 Accepts]: Start accepts. Automaton has 211 states and 304 transitions. Word has length 416 [2020-07-20 16:56:12,159 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:12,159 INFO L479 AbstractCegarLoop]: Abstraction has 211 states and 304 transitions. [2020-07-20 16:56:12,159 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 16:56:12,160 INFO L276 IsEmpty]: Start isEmpty. Operand 211 states and 304 transitions. [2020-07-20 16:56:12,163 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 412 [2020-07-20 16:56:12,163 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:12,164 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 30, 30, 19, 19, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 12, 11, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:12,378 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:12,379 INFO L427 AbstractCegarLoop]: === Iteration 45 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:12,379 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:12,379 INFO L82 PathProgramCache]: Analyzing trace with hash -131280481, now seen corresponding path program 24 times [2020-07-20 16:56:12,379 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:12,380 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1871919103] [2020-07-20 16:56:12,380 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 46 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:12,785 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:56:12,786 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:12,790 INFO L263 TraceCheckSpWp]: Trace formula consists of 612 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-20 16:56:12,794 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:13,377 INFO L134 CoverageAnalysis]: Checked inductivity of 4782 backedges. 573 proven. 1206 refuted. 0 times theorem prover too weak. 3003 trivial. 0 not checked. [2020-07-20 16:56:13,377 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:56:17,042 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:17,043 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:17,713 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:17,714 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:18,110 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:18,366 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:18,524 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:18,524 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:18,628 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:20,027 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:20,333 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:20,523 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:20,523 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:20,638 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:20,639 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:20,709 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:20,710 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:20,876 INFO L134 CoverageAnalysis]: Checked inductivity of 4782 backedges. 573 proven. 1244 refuted. 0 times theorem prover too weak. 2965 trivial. 0 not checked. [2020-07-20 16:56:20,876 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1871919103] [2020-07-20 16:56:20,876 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:56:20,876 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 29] total 35 [2020-07-20 16:56:20,877 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [278161544] [2020-07-20 16:56:20,877 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-07-20 16:56:20,877 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:20,878 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-07-20 16:56:20,878 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=1062, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 16:56:20,878 INFO L87 Difference]: Start difference. First operand 211 states and 304 transitions. Second operand 35 states. [2020-07-20 16:56:23,387 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:23,387 INFO L93 Difference]: Finished difference Result 492 states and 796 transitions. [2020-07-20 16:56:23,389 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-07-20 16:56:23,389 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 411 [2020-07-20 16:56:23,389 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:23,392 INFO L225 Difference]: With dead ends: 492 [2020-07-20 16:56:23,392 INFO L226 Difference]: Without dead ends: 254 [2020-07-20 16:56:23,395 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 853 GetRequests, 763 SyntacticMatches, 25 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 972 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=658, Invalid=3764, Unknown=0, NotChecked=0, Total=4422 [2020-07-20 16:56:23,395 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 254 states. [2020-07-20 16:56:23,406 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 254 to 223. [2020-07-20 16:56:23,407 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 223 states. [2020-07-20 16:56:23,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 223 states to 223 states and 313 transitions. [2020-07-20 16:56:23,408 INFO L78 Accepts]: Start accepts. Automaton has 223 states and 313 transitions. Word has length 411 [2020-07-20 16:56:23,408 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:23,409 INFO L479 AbstractCegarLoop]: Abstraction has 223 states and 313 transitions. [2020-07-20 16:56:23,409 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-07-20 16:56:23,409 INFO L276 IsEmpty]: Start isEmpty. Operand 223 states and 313 transitions. [2020-07-20 16:56:23,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 344 [2020-07-20 16:56:23,412 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:23,412 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 25, 25, 15, 15, 13, 13, 13, 13, 13, 13, 13, 12, 12, 12, 12, 12, 12, 12, 11, 10, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:23,612 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:23,613 INFO L427 AbstractCegarLoop]: === Iteration 46 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:23,614 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:23,614 INFO L82 PathProgramCache]: Analyzing trace with hash -1089242128, now seen corresponding path program 25 times [2020-07-20 16:56:23,614 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:23,615 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [461255346] [2020-07-20 16:56:23,615 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 47 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:24,043 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:56:24,044 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:24,046 INFO L263 TraceCheckSpWp]: Trace formula consists of 508 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 16:56:24,050 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:24,306 INFO L134 CoverageAnalysis]: Checked inductivity of 3286 backedges. 1875 proven. 246 refuted. 0 times theorem prover too weak. 1165 trivial. 0 not checked. [2020-07-20 16:56:24,307 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:56:27,137 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:27,138 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:27,293 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:27,397 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:28,384 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:28,658 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:28,659 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:28,810 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:28,904 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:28,905 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:29,021 INFO L134 CoverageAnalysis]: Checked inductivity of 3286 backedges. 259 proven. 868 refuted. 0 times theorem prover too weak. 2159 trivial. 0 not checked. [2020-07-20 16:56:29,022 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [461255346] [2020-07-20 16:56:29,022 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:56:29,022 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 21] total 25 [2020-07-20 16:56:29,022 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1831286129] [2020-07-20 16:56:29,023 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 16:56:29,023 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:29,023 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 16:56:29,023 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=521, Unknown=0, NotChecked=0, Total=600 [2020-07-20 16:56:29,024 INFO L87 Difference]: Start difference. First operand 223 states and 313 transitions. Second operand 25 states. [2020-07-20 16:56:30,259 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:30,260 INFO L93 Difference]: Finished difference Result 426 states and 611 transitions. [2020-07-20 16:56:30,261 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-07-20 16:56:30,261 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 343 [2020-07-20 16:56:30,262 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:30,263 INFO L225 Difference]: With dead ends: 426 [2020-07-20 16:56:30,263 INFO L226 Difference]: Without dead ends: 150 [2020-07-20 16:56:30,266 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 700 GetRequests, 643 SyntacticMatches, 19 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 261 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=263, Invalid=1297, Unknown=0, NotChecked=0, Total=1560 [2020-07-20 16:56:30,266 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2020-07-20 16:56:30,273 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 132. [2020-07-20 16:56:30,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 132 states. [2020-07-20 16:56:30,274 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 159 transitions. [2020-07-20 16:56:30,274 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 159 transitions. Word has length 343 [2020-07-20 16:56:30,275 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:30,275 INFO L479 AbstractCegarLoop]: Abstraction has 132 states and 159 transitions. [2020-07-20 16:56:30,275 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 16:56:30,275 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 159 transitions. [2020-07-20 16:56:30,278 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 238 [2020-07-20 16:56:30,278 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:30,279 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 17, 17, 10, 10, 9, 9, 9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 8, 8, 8, 7, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:30,479 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:30,480 INFO L427 AbstractCegarLoop]: === Iteration 47 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:30,480 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:30,481 INFO L82 PathProgramCache]: Analyzing trace with hash 120952594, now seen corresponding path program 26 times [2020-07-20 16:56:30,481 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:30,481 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [954333851] [2020-07-20 16:56:30,482 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 48 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:30,957 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:56:30,957 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:30,960 INFO L263 TraceCheckSpWp]: Trace formula consists of 461 conjuncts, 21 conjunts are in the unsatisfiable core [2020-07-20 16:56:30,963 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:31,243 INFO L134 CoverageAnalysis]: Checked inductivity of 1502 backedges. 312 proven. 362 refuted. 0 times theorem prover too weak. 828 trivial. 0 not checked. [2020-07-20 16:56:31,243 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:56:32,765 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:32,766 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:32,913 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:32,914 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:33,001 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:33,002 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:34,271 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:34,641 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:34,869 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:34,988 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:35,159 INFO L134 CoverageAnalysis]: Checked inductivity of 1502 backedges. 310 proven. 377 refuted. 0 times theorem prover too weak. 815 trivial. 0 not checked. [2020-07-20 16:56:35,159 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [954333851] [2020-07-20 16:56:35,159 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:56:35,160 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 22] total 27 [2020-07-20 16:56:35,160 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1956362832] [2020-07-20 16:56:35,160 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-20 16:56:35,160 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:35,161 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-20 16:56:35,161 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=610, Unknown=0, NotChecked=0, Total=702 [2020-07-20 16:56:35,161 INFO L87 Difference]: Start difference. First operand 132 states and 159 transitions. Second operand 27 states. [2020-07-20 16:56:36,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:36,575 INFO L93 Difference]: Finished difference Result 165 states and 199 transitions. [2020-07-20 16:56:36,577 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-07-20 16:56:36,577 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 237 [2020-07-20 16:56:36,578 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:36,579 INFO L225 Difference]: With dead ends: 165 [2020-07-20 16:56:36,580 INFO L226 Difference]: Without dead ends: 118 [2020-07-20 16:56:36,582 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 491 GetRequests, 430 SyntacticMatches, 19 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 349 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=323, Invalid=1569, Unknown=0, NotChecked=0, Total=1892 [2020-07-20 16:56:36,583 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-07-20 16:56:36,589 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 100. [2020-07-20 16:56:36,589 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2020-07-20 16:56:36,590 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 114 transitions. [2020-07-20 16:56:36,590 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 114 transitions. Word has length 237 [2020-07-20 16:56:36,591 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:36,591 INFO L479 AbstractCegarLoop]: Abstraction has 100 states and 114 transitions. [2020-07-20 16:56:36,591 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-20 16:56:36,591 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 114 transitions. [2020-07-20 16:56:36,593 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 274 [2020-07-20 16:56:36,593 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:36,593 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 20, 20, 11, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:36,806 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:36,807 INFO L427 AbstractCegarLoop]: === Iteration 48 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:36,807 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:36,808 INFO L82 PathProgramCache]: Analyzing trace with hash 220548973, now seen corresponding path program 6 times [2020-07-20 16:56:36,808 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:36,808 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1345198254] [2020-07-20 16:56:36,809 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 49 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:37,304 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:56:37,304 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:37,306 INFO L263 TraceCheckSpWp]: Trace formula consists of 531 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-20 16:56:37,310 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:37,474 INFO L134 CoverageAnalysis]: Checked inductivity of 2050 backedges. 132 proven. 427 refuted. 0 times theorem prover too weak. 1491 trivial. 0 not checked. [2020-07-20 16:56:37,474 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:56:39,406 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:39,407 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:39,888 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:40,137 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:40,137 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:40,293 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:40,294 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:40,375 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:40,482 INFO L134 CoverageAnalysis]: Checked inductivity of 2050 backedges. 130 proven. 443 refuted. 0 times theorem prover too weak. 1477 trivial. 0 not checked. [2020-07-20 16:56:40,482 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1345198254] [2020-07-20 16:56:40,482 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:56:40,483 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 16] total 19 [2020-07-20 16:56:40,483 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1281867516] [2020-07-20 16:56:40,483 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 16:56:40,483 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:40,483 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 16:56:40,484 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=274, Unknown=0, NotChecked=0, Total=342 [2020-07-20 16:56:40,484 INFO L87 Difference]: Start difference. First operand 100 states and 114 transitions. Second operand 19 states. [2020-07-20 16:56:40,767 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:40,768 INFO L93 Difference]: Finished difference Result 100 states and 114 transitions. [2020-07-20 16:56:40,769 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 16:56:40,769 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 273 [2020-07-20 16:56:40,770 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:40,770 INFO L225 Difference]: With dead ends: 100 [2020-07-20 16:56:40,770 INFO L226 Difference]: Without dead ends: 0 [2020-07-20 16:56:40,771 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 551 GetRequests, 515 SyntacticMatches, 13 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 133 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=128, Invalid=472, Unknown=0, NotChecked=0, Total=600 [2020-07-20 16:56:40,772 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-20 16:56:40,772 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-20 16:56:40,772 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-20 16:56:40,772 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-20 16:56:40,772 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 273 [2020-07-20 16:56:40,772 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:40,773 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-20 16:56:40,773 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 16:56:40,773 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-20 16:56:40,773 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-20 16:56:40,981 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:40,986 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-20 16:56:41,537 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 18 [2020-07-20 16:56:42,344 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 102 DAG size of output: 11 [2020-07-20 16:56:42,489 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 102 DAG size of output: 11 [2020-07-20 16:56:42,605 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 102 DAG size of output: 11 [2020-07-20 16:56:46,377 WARN L193 SmtUtils]: Spent 205.00 ms on a formula simplification. DAG size of input: 151 DAG size of output: 75 [2020-07-20 16:56:48,441 WARN L193 SmtUtils]: Spent 866.00 ms on a formula simplification. DAG size of input: 187 DAG size of output: 9 [2020-07-20 16:56:49,179 WARN L193 SmtUtils]: Spent 721.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 1 [2020-07-20 16:56:49,733 WARN L193 SmtUtils]: Spent 538.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 1 [2020-07-20 16:56:51,301 WARN L193 SmtUtils]: Spent 1.56 s on a formula simplification. DAG size of input: 236 DAG size of output: 22 [2020-07-20 16:56:52,220 WARN L193 SmtUtils]: Spent 907.00 ms on a formula simplification. DAG size of input: 192 DAG size of output: 8 [2020-07-20 16:56:54,232 WARN L193 SmtUtils]: Spent 1.99 s on a formula simplification. DAG size of input: 286 DAG size of output: 15 [2020-07-20 16:56:54,237 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-20 16:56:54,238 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-20 16:56:54,238 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-20 16:56:54,238 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-20 16:56:54,238 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-20 16:56:54,238 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-20 16:56:54,238 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 39) no Hoare annotation was computed. [2020-07-20 16:56:54,238 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 35 42) the Hoare annotation is: true [2020-07-20 16:56:54,239 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 35 42) no Hoare annotation was computed. [2020-07-20 16:56:54,239 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 35 42) no Hoare annotation was computed. [2020-07-20 16:56:54,239 INFO L268 CegarLoopResult]: For program point L39(line 39) no Hoare annotation was computed. [2020-07-20 16:56:54,239 INFO L268 CegarLoopResult]: For program point L38(lines 38 40) no Hoare annotation was computed. [2020-07-20 16:56:54,239 INFO L264 CegarLoopResult]: At program point L37(line 37) the Hoare annotation is: (and (<= main_~x~0 6) (<= 6 main_~x~0)) [2020-07-20 16:56:54,239 INFO L268 CegarLoopResult]: For program point L37-1(line 37) no Hoare annotation was computed. [2020-07-20 16:56:54,239 INFO L268 CegarLoopResult]: For program point L38-2(lines 38 40) no Hoare annotation was computed. [2020-07-20 16:56:54,240 INFO L271 CegarLoopResult]: At program point fibo2ENTRY(lines 17 25) the Hoare annotation is: true [2020-07-20 16:56:54,240 INFO L264 CegarLoopResult]: At program point L23(line 23) the Hoare annotation is: (and (<= fibo2_~n |fibo2_#in~n|) (<= |fibo2_#in~n| fibo2_~n) (not (<= |fibo2_#in~n| 2))) [2020-07-20 16:56:54,240 INFO L268 CegarLoopResult]: For program point L23-1(line 23) no Hoare annotation was computed. [2020-07-20 16:56:54,240 INFO L264 CegarLoopResult]: At program point L23-2(line 23) the Hoare annotation is: (let ((.cse0 (<= fibo2_~n |fibo2_#in~n|)) (.cse1 (<= |fibo2_#in~n| fibo2_~n))) (or (and .cse0 .cse1 (<= 6 fibo2_~n)) (and .cse0 (= 3 |fibo2_#t~ret2|) (<= 5 fibo2_~n) (< |fibo2_#in~n| 6)) (and .cse0 (< fibo2_~n 5) .cse1 (= 2 |fibo2_#t~ret2|) (<= 4 fibo2_~n)))) [2020-07-20 16:56:54,241 INFO L268 CegarLoopResult]: For program point L20(lines 20 24) no Hoare annotation was computed. [2020-07-20 16:56:54,241 INFO L268 CegarLoopResult]: For program point L23-3(line 23) no Hoare annotation was computed. [2020-07-20 16:56:54,241 INFO L268 CegarLoopResult]: For program point L18(lines 18 24) no Hoare annotation was computed. [2020-07-20 16:56:54,241 INFO L268 CegarLoopResult]: For program point fibo2FINAL(lines 17 25) no Hoare annotation was computed. [2020-07-20 16:56:54,241 INFO L268 CegarLoopResult]: For program point fibo2EXIT(lines 17 25) no Hoare annotation was computed. [2020-07-20 16:56:54,241 INFO L271 CegarLoopResult]: At program point fibo1ENTRY(lines 7 15) the Hoare annotation is: true [2020-07-20 16:56:54,241 INFO L264 CegarLoopResult]: At program point L13(line 13) the Hoare annotation is: (and (<= fibo1_~n |fibo1_#in~n|) (not (<= |fibo1_#in~n| 2)) (<= |fibo1_#in~n| fibo1_~n)) [2020-07-20 16:56:54,241 INFO L268 CegarLoopResult]: For program point L13-1(line 13) no Hoare annotation was computed. [2020-07-20 16:56:54,241 INFO L264 CegarLoopResult]: At program point L13-2(line 13) the Hoare annotation is: (let ((.cse0 (<= fibo1_~n |fibo1_#in~n|))) (or (and .cse0 (<= 5 fibo1_~n) (<= |fibo1_#in~n| 5)) (and (= 5 |fibo1_#t~ret0|) .cse0 (<= 6 fibo1_~n) (<= |fibo1_#in~n| fibo1_~n) (<= fibo1_~n 6)))) [2020-07-20 16:56:54,242 INFO L268 CegarLoopResult]: For program point fibo1FINAL(lines 7 15) no Hoare annotation was computed. [2020-07-20 16:56:54,242 INFO L268 CegarLoopResult]: For program point L10(lines 10 14) no Hoare annotation was computed. [2020-07-20 16:56:54,242 INFO L268 CegarLoopResult]: For program point L13-3(line 13) no Hoare annotation was computed. [2020-07-20 16:56:54,242 INFO L268 CegarLoopResult]: For program point L8(lines 8 14) no Hoare annotation was computed. [2020-07-20 16:56:54,242 INFO L268 CegarLoopResult]: For program point fibo1EXIT(lines 7 15) no Hoare annotation was computed. [2020-07-20 16:56:54,248 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 04:56:54 BoogieIcfgContainer [2020-07-20 16:56:54,249 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 16:56:54,250 INFO L168 Benchmark]: Toolchain (without parser) took 164860.27 ms. Allocated memory was 140.5 MB in the beginning and 999.8 MB in the end (delta: 859.3 MB). Free memory was 99.9 MB in the beginning and 192.0 MB in the end (delta: -92.2 MB). Peak memory consumption was 891.3 MB. Max. memory is 7.1 GB. [2020-07-20 16:56:54,251 INFO L168 Benchmark]: CDTParser took 1.00 ms. Allocated memory is still 140.5 MB. Free memory was 118.1 MB in the beginning and 117.9 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-07-20 16:56:54,251 INFO L168 Benchmark]: CACSL2BoogieTranslator took 337.34 ms. Allocated memory is still 140.5 MB. Free memory was 99.4 MB in the beginning and 89.9 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. [2020-07-20 16:56:54,252 INFO L168 Benchmark]: Boogie Preprocessor took 122.50 ms. Allocated memory was 140.5 MB in the beginning and 200.8 MB in the end (delta: 60.3 MB). Free memory was 89.9 MB in the beginning and 179.5 MB in the end (delta: -89.6 MB). Peak memory consumption was 10.5 MB. Max. memory is 7.1 GB. [2020-07-20 16:56:54,252 INFO L168 Benchmark]: RCFGBuilder took 274.23 ms. Allocated memory is still 200.8 MB. Free memory was 179.5 MB in the beginning and 166.2 MB in the end (delta: 13.3 MB). Peak memory consumption was 13.3 MB. Max. memory is 7.1 GB. [2020-07-20 16:56:54,253 INFO L168 Benchmark]: TraceAbstraction took 164110.46 ms. Allocated memory was 200.8 MB in the beginning and 999.8 MB in the end (delta: 799.0 MB). Free memory was 165.6 MB in the beginning and 192.0 MB in the end (delta: -26.5 MB). Peak memory consumption was 896.8 MB. Max. memory is 7.1 GB. [2020-07-20 16:56:54,255 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 1.00 ms. Allocated memory is still 140.5 MB. Free memory was 118.1 MB in the beginning and 117.9 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 337.34 ms. Allocated memory is still 140.5 MB. Free memory was 99.4 MB in the beginning and 89.9 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 122.50 ms. Allocated memory was 140.5 MB in the beginning and 200.8 MB in the end (delta: 60.3 MB). Free memory was 89.9 MB in the beginning and 179.5 MB in the end (delta: -89.6 MB). Peak memory consumption was 10.5 MB. Max. memory is 7.1 GB. * RCFGBuilder took 274.23 ms. Allocated memory is still 200.8 MB. Free memory was 179.5 MB in the beginning and 166.2 MB in the end (delta: 13.3 MB). Peak memory consumption was 13.3 MB. Max. memory is 7.1 GB. * TraceAbstraction took 164110.46 ms. Allocated memory was 200.8 MB in the beginning and 999.8 MB in the end (delta: 799.0 MB). Free memory was 165.6 MB in the beginning and 192.0 MB in the end (delta: -26.5 MB). Peak memory consumption was 896.8 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 39]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 33 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 150.7s, OverallIterations: 48, TraceHistogramMax: 37, AutomataDifference: 34.5s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 13.2s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 1568 SDtfs, 3727 SDslu, 13755 SDs, 0 SdLazy, 17650 SolverSat, 3978 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 14.6s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 15960 GetRequests, 14143 SyntacticMatches, 545 SemanticMatches, 1272 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7138 ImplicationChecksByTransitivity, 28.4s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=268occurred in iteration=34, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.9s AutomataMinimizationTime, 48 MinimizatonAttempts, 783 StatesRemovedByMinimization, 45 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 11 LocationsWithAnnotation, 3293 PreInvPairs, 5717 NumberOfFragments, 102 HoareAnnotationTreeSize, 3293 FomulaSimplifications, 73618509 FormulaSimplificationTreeSizeReduction, 6.4s HoareSimplificationTime, 11 FomulaSimplificationsInter, 98096709 FormulaSimplificationTreeSizeReductionInter, 6.6s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.4s SsaConstructionTime, 1.9s SatisfiabilityAnalysisTime, 95.1s InterpolantComputationTime, 7741 NumberOfCodeBlocks, 4853 NumberOfCodeBlocksAsserted, 125 NumberOfCheckSat, 15361 ConstructedInterpolants, 0 QuantifiedInterpolants, 5824823 SizeOfPredicates, 339 NumberOfNonLiveVariables, 12988 ConjunctsInSsa, 733 ConjunctsInUnsatCore, 94 InterpolantComputations, 2 PerfectInterpolantSequences, 78143/97934 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...