/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_FUNCTIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_10-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 13:21:07,014 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 13:21:07,017 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 13:21:07,040 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 13:21:07,040 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 13:21:07,042 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 13:21:07,044 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 13:21:07,056 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 13:21:07,060 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 13:21:07,062 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 13:21:07,065 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 13:21:07,066 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 13:21:07,066 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 13:21:07,068 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 13:21:07,070 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 13:21:07,072 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 13:21:07,074 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 13:21:07,075 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 13:21:07,076 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 13:21:07,081 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 13:21:07,085 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 13:21:07,089 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 13:21:07,090 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 13:21:07,090 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 13:21:07,093 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 13:21:07,102 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 13:21:07,103 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 13:21:07,104 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 13:21:07,105 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 13:21:07,144 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 13:21:07,144 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 13:21:07,146 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 13:21:07,148 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 13:21:07,148 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 13:21:07,149 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 13:21:07,149 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 13:21:07,149 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 13:21:07,149 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 13:21:07,149 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 13:21:07,150 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 13:21:07,150 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 13:21:07,150 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 13:21:07,150 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 13:21:07,150 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 13:21:07,151 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 13:21:07,151 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 13:21:07,151 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 13:21:07,152 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 13:21:07,153 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 13:21:07,153 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 13:21:07,153 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 13:21:07,153 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 13:21:07,154 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 13:21:07,154 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 13:21:07,154 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 13:21:07,154 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:07,155 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 13:21:07,155 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 13:21:07,155 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_FUNCTIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 13:21:07,454 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 13:21:07,470 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 13:21:07,474 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 13:21:07,476 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 13:21:07,476 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 13:21:07,477 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_10-2.c [2020-07-20 13:21:07,562 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b8036809f/5e9e7374a7d44d80bcbe461ff5101233/FLAG31d7b2563 [2020-07-20 13:21:08,060 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 13:21:08,061 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_10-2.c [2020-07-20 13:21:08,070 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b8036809f/5e9e7374a7d44d80bcbe461ff5101233/FLAG31d7b2563 [2020-07-20 13:21:08,387 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b8036809f/5e9e7374a7d44d80bcbe461ff5101233 [2020-07-20 13:21:08,397 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 13:21:08,400 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 13:21:08,401 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 13:21:08,401 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 13:21:08,406 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 13:21:08,407 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 01:21:08" (1/1) ... [2020-07-20 13:21:08,411 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1f0f170c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:08, skipping insertion in model container [2020-07-20 13:21:08,411 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 01:21:08" (1/1) ... [2020-07-20 13:21:08,421 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 13:21:08,442 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 13:21:08,627 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 13:21:08,631 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 13:21:08,645 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 13:21:08,659 INFO L208 MainTranslator]: Completed translation [2020-07-20 13:21:08,660 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:08 WrapperNode [2020-07-20 13:21:08,660 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 13:21:08,661 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 13:21:08,661 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 13:21:08,661 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 13:21:08,675 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:08" (1/1) ... [2020-07-20 13:21:08,675 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:08" (1/1) ... [2020-07-20 13:21:08,680 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:08" (1/1) ... [2020-07-20 13:21:08,681 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:08" (1/1) ... [2020-07-20 13:21:08,684 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:08" (1/1) ... [2020-07-20 13:21:08,689 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:08" (1/1) ... [2020-07-20 13:21:08,690 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:08" (1/1) ... [2020-07-20 13:21:08,692 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 13:21:08,692 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 13:21:08,692 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 13:21:08,693 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 13:21:08,694 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:08" (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 13:21:08,861 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 13:21:08,861 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 13:21:08,861 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo [2020-07-20 13:21:08,861 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 13:21:08,862 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 13:21:08,862 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 13:21:08,862 INFO L130 BoogieDeclarations]: Found specification of procedure fibo [2020-07-20 13:21:08,863 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 13:21:08,864 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 13:21:08,864 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 13:21:09,045 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 13:21:09,046 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 13:21:09,051 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 01:21:09 BoogieIcfgContainer [2020-07-20 13:21:09,051 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 13:21:09,053 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 13:21:09,053 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 13:21:09,057 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 13:21:09,057 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 01:21:08" (1/3) ... [2020-07-20 13:21:09,058 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@124c3018 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 01:21:09, skipping insertion in model container [2020-07-20 13:21:09,059 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:08" (2/3) ... [2020-07-20 13:21:09,059 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@124c3018 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 01:21:09, skipping insertion in model container [2020-07-20 13:21:09,059 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 01:21:09" (3/3) ... [2020-07-20 13:21:09,062 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_10-2.c [2020-07-20 13:21:09,076 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 13:21:09,086 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 13:21:09,106 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 13:21:09,141 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 13:21:09,141 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 13:21:09,142 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 13:21:09,142 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 13:21:09,142 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 13:21:09,143 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 13:21:09,143 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 13:21:09,143 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 13:21:09,171 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2020-07-20 13:21:09,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 13:21:09,180 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:09,181 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:09,182 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:09,189 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:09,190 INFO L82 PathProgramCache]: Analyzing trace with hash 537028541, now seen corresponding path program 1 times [2020-07-20 13:21:09,200 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:09,201 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [538686733] [2020-07-20 13:21:09,201 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 13:21:09,275 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:09,276 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:09,278 INFO L263 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 13:21:09,284 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:09,377 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 13:21:09,377 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:21:09,379 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [538686733] [2020-07-20 13:21:09,380 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:21:09,380 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 13:21:09,381 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1392050943] [2020-07-20 13:21:09,386 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 13:21:09,386 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:09,402 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 13:21:09,403 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 13:21:09,405 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 5 states. [2020-07-20 13:21:09,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:09,516 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2020-07-20 13:21:09,517 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 13:21:09,519 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-20 13:21:09,519 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:09,530 INFO L225 Difference]: With dead ends: 35 [2020-07-20 13:21:09,530 INFO L226 Difference]: Without dead ends: 21 [2020-07-20 13:21:09,534 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 13:21:09,550 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-20 13:21:09,572 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-20 13:21:09,574 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-20 13:21:09,576 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-20 13:21:09,578 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2020-07-20 13:21:09,578 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:09,579 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-20 13:21:09,579 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 13:21:09,579 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-20 13:21:09,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-20 13:21:09,581 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:09,582 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:09,798 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:09,798 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:09,799 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:09,799 INFO L82 PathProgramCache]: Analyzing trace with hash 179123823, now seen corresponding path program 1 times [2020-07-20 13:21:09,799 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:09,800 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1392512383] [2020-07-20 13:21:09,800 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 13:21:09,824 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:09,825 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:09,826 INFO L263 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 13:21:09,827 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:09,861 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 13:21:09,862 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:21:09,862 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1392512383] [2020-07-20 13:21:09,862 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:21:09,863 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 13:21:09,863 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [307140802] [2020-07-20 13:21:09,867 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 13:21:09,868 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:09,868 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 13:21:09,869 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 13:21:09,869 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 5 states. [2020-07-20 13:21:09,947 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:09,948 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-07-20 13:21:09,949 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 13:21:09,949 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-20 13:21:09,950 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:09,951 INFO L225 Difference]: With dead ends: 27 [2020-07-20 13:21:09,951 INFO L226 Difference]: Without dead ends: 23 [2020-07-20 13:21:09,953 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 13:21:09,954 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-20 13:21:09,960 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2020-07-20 13:21:09,960 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-20 13:21:09,962 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-20 13:21:09,962 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 14 [2020-07-20 13:21:09,963 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:09,963 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-20 13:21:09,963 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 13:21:09,963 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-20 13:21:09,965 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 13:21:09,965 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:09,965 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:10,181 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:10,181 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:10,183 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:10,185 INFO L82 PathProgramCache]: Analyzing trace with hash 806022394, now seen corresponding path program 1 times [2020-07-20 13:21:10,186 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:10,186 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [272610736] [2020-07-20 13:21:10,188 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 13:21:10,240 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:10,241 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:10,242 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 13:21:10,244 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:10,294 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 13:21:10,294 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:10,463 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:10,512 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-20 13:21:10,513 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [272610736] [2020-07-20 13:21:10,513 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:10,514 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-20 13:21:10,514 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1483887090] [2020-07-20 13:21:10,515 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 13:21:10,515 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:10,515 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 13:21:10,516 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-20 13:21:10,516 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 9 states. [2020-07-20 13:21:10,632 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:10,632 INFO L93 Difference]: Finished difference Result 32 states and 42 transitions. [2020-07-20 13:21:10,633 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 13:21:10,633 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-07-20 13:21:10,634 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:10,636 INFO L225 Difference]: With dead ends: 32 [2020-07-20 13:21:10,636 INFO L226 Difference]: Without dead ends: 28 [2020-07-20 13:21:10,637 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 41 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-20 13:21:10,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-20 13:21:10,645 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-07-20 13:21:10,646 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-20 13:21:10,647 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-20 13:21:10,648 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 26 [2020-07-20 13:21:10,648 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:10,648 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-20 13:21:10,648 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 13:21:10,649 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-20 13:21:10,650 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 13:21:10,650 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:10,651 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:10,865 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:10,866 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:10,866 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:10,867 INFO L82 PathProgramCache]: Analyzing trace with hash -983862936, now seen corresponding path program 1 times [2020-07-20 13:21:10,867 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:10,868 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [562519119] [2020-07-20 13:21:10,869 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 13:21:10,908 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:10,908 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:10,909 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 13:21:10,911 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:10,971 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-20 13:21:10,972 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:11,132 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:11,173 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-20 13:21:11,173 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [562519119] [2020-07-20 13:21:11,174 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:11,174 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-20 13:21:11,175 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [390763900] [2020-07-20 13:21:11,175 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 13:21:11,176 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:11,176 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 13:21:11,177 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-20 13:21:11,177 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 9 states. [2020-07-20 13:21:11,292 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:11,293 INFO L93 Difference]: Finished difference Result 37 states and 54 transitions. [2020-07-20 13:21:11,296 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 13:21:11,296 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2020-07-20 13:21:11,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:11,303 INFO L225 Difference]: With dead ends: 37 [2020-07-20 13:21:11,304 INFO L226 Difference]: Without dead ends: 33 [2020-07-20 13:21:11,305 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 44 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-20 13:21:11,306 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-20 13:21:11,322 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 26. [2020-07-20 13:21:11,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-20 13:21:11,326 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-20 13:21:11,326 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 27 [2020-07-20 13:21:11,329 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:11,329 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-20 13:21:11,330 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 13:21:11,330 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-20 13:21:11,334 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-20 13:21:11,335 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:11,335 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:11,543 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:11,544 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:11,544 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:11,545 INFO L82 PathProgramCache]: Analyzing trace with hash -2027372739, now seen corresponding path program 2 times [2020-07-20 13:21:11,545 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:11,546 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2065442187] [2020-07-20 13:21:11,546 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 13:21:11,595 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:11,595 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:11,596 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 13:21:11,603 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:11,655 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 21 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-20 13:21:11,655 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:11,917 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:11,921 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:11,988 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:11,989 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:12,026 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 26 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-20 13:21:12,027 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2065442187] [2020-07-20 13:21:12,027 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:12,028 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-20 13:21:12,028 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1061432348] [2020-07-20 13:21:12,029 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 13:21:12,029 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:12,029 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 13:21:12,030 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-20 13:21:12,030 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 11 states. [2020-07-20 13:21:12,216 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:12,216 INFO L93 Difference]: Finished difference Result 42 states and 68 transitions. [2020-07-20 13:21:12,218 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 13:21:12,218 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 39 [2020-07-20 13:21:12,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:12,221 INFO L225 Difference]: With dead ends: 42 [2020-07-20 13:21:12,221 INFO L226 Difference]: Without dead ends: 38 [2020-07-20 13:21:12,222 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 64 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-20 13:21:12,222 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-20 13:21:12,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 31. [2020-07-20 13:21:12,231 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-20 13:21:12,232 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-20 13:21:12,232 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 39 [2020-07-20 13:21:12,233 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:12,233 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-20 13:21:12,233 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 13:21:12,233 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-20 13:21:12,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-20 13:21:12,235 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:12,235 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:12,436 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:12,437 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:12,438 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:12,438 INFO L82 PathProgramCache]: Analyzing trace with hash -1111873851, now seen corresponding path program 2 times [2020-07-20 13:21:12,439 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:12,439 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1133238331] [2020-07-20 13:21:12,439 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 13:21:12,473 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:12,473 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:12,474 INFO L263 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 13:21:12,476 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:12,517 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 24 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-07-20 13:21:12,518 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:12,744 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:12,799 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:12,800 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:12,837 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 31 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-20 13:21:12,837 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1133238331] [2020-07-20 13:21:12,838 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:12,838 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-20 13:21:12,838 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [479129004] [2020-07-20 13:21:12,839 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 13:21:12,839 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:12,839 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 13:21:12,840 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-20 13:21:12,840 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 11 states. [2020-07-20 13:21:12,981 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:12,982 INFO L93 Difference]: Finished difference Result 47 states and 84 transitions. [2020-07-20 13:21:12,982 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 13:21:12,983 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 41 [2020-07-20 13:21:12,984 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:12,986 INFO L225 Difference]: With dead ends: 47 [2020-07-20 13:21:12,992 INFO L226 Difference]: Without dead ends: 43 [2020-07-20 13:21:12,993 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 68 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-20 13:21:12,994 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-07-20 13:21:13,014 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 31. [2020-07-20 13:21:13,015 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-20 13:21:13,016 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-20 13:21:13,016 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 41 [2020-07-20 13:21:13,016 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:13,017 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-20 13:21:13,017 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 13:21:13,017 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-20 13:21:13,026 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-07-20 13:21:13,026 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:13,026 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 5, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:13,227 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:13,228 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:13,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:13,229 INFO L82 PathProgramCache]: Analyzing trace with hash -767819153, now seen corresponding path program 3 times [2020-07-20 13:21:13,230 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:13,230 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1243828279] [2020-07-20 13:21:13,231 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 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 13:21:13,276 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:13,277 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:13,278 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 13:21:13,281 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:13,323 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 79 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-07-20 13:21:13,324 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:13,755 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:13,854 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:13,855 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:13,905 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:13,907 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:13,955 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 91 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2020-07-20 13:21:13,956 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1243828279] [2020-07-20 13:21:13,956 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:13,956 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-20 13:21:13,957 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1525915657] [2020-07-20 13:21:13,957 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 13:21:13,958 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:13,958 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 13:21:13,958 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-20 13:21:13,959 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 13 states. [2020-07-20 13:21:14,149 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:14,150 INFO L93 Difference]: Finished difference Result 52 states and 102 transitions. [2020-07-20 13:21:14,151 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 13:21:14,151 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 65 [2020-07-20 13:21:14,152 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:14,156 INFO L225 Difference]: With dead ends: 52 [2020-07-20 13:21:14,157 INFO L226 Difference]: Without dead ends: 48 [2020-07-20 13:21:14,158 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 111 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:21:14,161 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-20 13:21:14,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 36. [2020-07-20 13:21:14,181 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-20 13:21:14,183 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-20 13:21:14,185 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 65 [2020-07-20 13:21:14,186 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:14,186 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-20 13:21:14,186 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 13:21:14,187 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-20 13:21:14,197 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-07-20 13:21:14,198 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:14,198 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 11, 6, 6, 6, 6, 6, 6, 6, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:14,411 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:14,412 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:14,413 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:14,413 INFO L82 PathProgramCache]: Analyzing trace with hash 1474757101, now seen corresponding path program 3 times [2020-07-20 13:21:14,413 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:14,414 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1912708748] [2020-07-20 13:21:14,414 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 13:21:14,469 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:14,469 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:14,470 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 13:21:14,474 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:14,560 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 166 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2020-07-20 13:21:14,560 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:14,989 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:15,084 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:15,085 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:15,128 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:15,167 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 181 refuted. 0 times theorem prover too weak. 219 trivial. 0 not checked. [2020-07-20 13:21:15,167 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1912708748] [2020-07-20 13:21:15,168 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:15,168 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-20 13:21:15,168 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [461384851] [2020-07-20 13:21:15,169 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 13:21:15,169 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:15,170 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 13:21:15,170 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-20 13:21:15,170 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 13 states. [2020-07-20 13:21:15,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:15,308 INFO L93 Difference]: Finished difference Result 57 states and 122 transitions. [2020-07-20 13:21:15,317 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 13:21:15,317 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 96 [2020-07-20 13:21:15,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:15,320 INFO L225 Difference]: With dead ends: 57 [2020-07-20 13:21:15,320 INFO L226 Difference]: Without dead ends: 53 [2020-07-20 13:21:15,321 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 172 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:21:15,321 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-07-20 13:21:15,332 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 36. [2020-07-20 13:21:15,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-20 13:21:15,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-20 13:21:15,334 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 96 [2020-07-20 13:21:15,334 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:15,334 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-20 13:21:15,334 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 13:21:15,335 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-20 13:21:15,336 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-07-20 13:21:15,336 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:15,337 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 9, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:15,551 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:15,552 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:15,553 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:15,554 INFO L82 PathProgramCache]: Analyzing trace with hash 838335741, now seen corresponding path program 4 times [2020-07-20 13:21:15,554 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:15,555 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1001721894] [2020-07-20 13:21:15,555 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 13:21:15,625 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:15,625 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:15,627 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 13:21:15,631 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:15,735 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 244 refuted. 0 times theorem prover too weak. 386 trivial. 0 not checked. [2020-07-20 13:21:15,736 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:16,324 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:16,325 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:16,514 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:16,604 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:16,652 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:16,713 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 266 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2020-07-20 13:21:16,714 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1001721894] [2020-07-20 13:21:16,714 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:16,714 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-20 13:21:16,715 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [411116071] [2020-07-20 13:21:16,715 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 13:21:16,716 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:16,716 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 13:21:16,716 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-20 13:21:16,716 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 15 states. [2020-07-20 13:21:16,998 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:16,999 INFO L93 Difference]: Finished difference Result 62 states and 144 transitions. [2020-07-20 13:21:16,999 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 13:21:16,999 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 117 [2020-07-20 13:21:17,000 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:17,002 INFO L225 Difference]: With dead ends: 62 [2020-07-20 13:21:17,002 INFO L226 Difference]: Without dead ends: 58 [2020-07-20 13:21:17,005 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 211 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2020-07-20 13:21:17,005 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-07-20 13:21:17,015 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 41. [2020-07-20 13:21:17,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-20 13:21:17,017 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-20 13:21:17,017 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 117 [2020-07-20 13:21:17,018 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:17,018 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-20 13:21:17,018 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 13:21:17,018 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-20 13:21:17,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2020-07-20 13:21:17,021 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:17,022 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 21, 13, 13, 13, 13, 13, 13, 13, 8, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:17,235 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:17,236 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:17,236 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:17,236 INFO L82 PathProgramCache]: Analyzing trace with hash -2072922826, now seen corresponding path program 4 times [2020-07-20 13:21:17,236 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:17,237 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [343395601] [2020-07-20 13:21:17,237 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 13:21:17,320 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:17,321 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:17,323 INFO L263 TraceCheckSpWp]: Trace formula consists of 348 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 13:21:17,327 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:17,411 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 86 proven. 506 refuted. 0 times theorem prover too weak. 1334 trivial. 0 not checked. [2020-07-20 13:21:17,412 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:18,130 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:18,352 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:18,431 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:18,432 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:18,483 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:18,485 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:18,545 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 86 proven. 532 refuted. 0 times theorem prover too weak. 1308 trivial. 0 not checked. [2020-07-20 13:21:18,545 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [343395601] [2020-07-20 13:21:18,545 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:18,545 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-20 13:21:18,546 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1483265661] [2020-07-20 13:21:18,547 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 13:21:18,547 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:18,547 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 13:21:18,548 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-20 13:21:18,548 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 15 states. [2020-07-20 13:21:18,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:18,757 INFO L93 Difference]: Finished difference Result 67 states and 168 transitions. [2020-07-20 13:21:18,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 13:21:18,758 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 190 [2020-07-20 13:21:18,758 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:18,761 INFO L225 Difference]: With dead ends: 67 [2020-07-20 13:21:18,761 INFO L226 Difference]: Without dead ends: 63 [2020-07-20 13:21:18,762 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 356 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2020-07-20 13:21:18,763 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-07-20 13:21:18,773 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 41. [2020-07-20 13:21:18,773 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-20 13:21:18,775 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-20 13:21:18,775 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 190 [2020-07-20 13:21:18,776 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:18,776 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-20 13:21:18,776 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 13:21:18,776 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-20 13:21:18,780 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 287 [2020-07-20 13:21:18,781 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:18,781 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 22, 21, 21, 21, 21, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:18,996 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:18,997 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:18,998 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:18,998 INFO L82 PathProgramCache]: Analyzing trace with hash -1082984306, now seen corresponding path program 5 times [2020-07-20 13:21:18,998 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:18,998 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [721252276] [2020-07-20 13:21:18,998 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 13:21:19,119 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:19,119 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:19,120 INFO L263 TraceCheckSpWp]: Trace formula consists of 524 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 13:21:19,126 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:19,230 INFO L134 CoverageAnalysis]: Checked inductivity of 4662 backedges. 159 proven. 967 refuted. 0 times theorem prover too weak. 3536 trivial. 0 not checked. [2020-07-20 13:21:19,230 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:20,419 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:20,774 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:20,948 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:21,032 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:21,077 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:21,078 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:21,177 INFO L134 CoverageAnalysis]: Checked inductivity of 4662 backedges. 159 proven. 1002 refuted. 0 times theorem prover too weak. 3501 trivial. 0 not checked. [2020-07-20 13:21:21,177 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [721252276] [2020-07-20 13:21:21,178 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:21,178 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-20 13:21:21,178 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [862728551] [2020-07-20 13:21:21,179 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 13:21:21,179 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:21,180 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 13:21:21,180 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:21:21,180 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 17 states. [2020-07-20 13:21:21,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:21,403 INFO L93 Difference]: Finished difference Result 72 states and 194 transitions. [2020-07-20 13:21:21,404 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 13:21:21,404 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 286 [2020-07-20 13:21:21,405 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:21,407 INFO L225 Difference]: With dead ends: 72 [2020-07-20 13:21:21,407 INFO L226 Difference]: Without dead ends: 68 [2020-07-20 13:21:21,408 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 578 GetRequests, 545 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:21:21,409 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-07-20 13:21:21,419 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 46. [2020-07-20 13:21:21,420 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-20 13:21:21,424 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-20 13:21:21,425 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 286 [2020-07-20 13:21:21,426 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:21,426 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-20 13:21:21,426 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 13:21:21,426 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-20 13:21:21,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 300 [2020-07-20 13:21:21,431 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:21,431 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 34, 21, 21, 21, 21, 21, 21, 21, 13, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:21,644 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:21,645 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:21,645 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:21,646 INFO L82 PathProgramCache]: Analyzing trace with hash 1006419304, now seen corresponding path program 5 times [2020-07-20 13:21:21,646 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:21,646 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [831254962] [2020-07-20 13:21:21,646 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 13:21:21,777 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:21,778 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:21,780 INFO L263 TraceCheckSpWp]: Trace formula consists of 543 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 13:21:21,788 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:21,922 INFO L134 CoverageAnalysis]: Checked inductivity of 5013 backedges. 159 proven. 1055 refuted. 0 times theorem prover too weak. 3799 trivial. 0 not checked. [2020-07-20 13:21:21,922 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:23,184 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:23,511 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:23,673 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:23,757 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:23,758 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:23,802 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:23,904 INFO L134 CoverageAnalysis]: Checked inductivity of 5013 backedges. 159 proven. 1095 refuted. 0 times theorem prover too weak. 3759 trivial. 0 not checked. [2020-07-20 13:21:23,904 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [831254962] [2020-07-20 13:21:23,905 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:23,905 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-20 13:21:23,905 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [984345167] [2020-07-20 13:21:23,906 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 13:21:23,906 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:23,907 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 13:21:23,907 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:21:23,907 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 17 states. [2020-07-20 13:21:24,116 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:24,117 INFO L93 Difference]: Finished difference Result 77 states and 222 transitions. [2020-07-20 13:21:24,118 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 13:21:24,118 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 299 [2020-07-20 13:21:24,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:24,125 INFO L225 Difference]: With dead ends: 77 [2020-07-20 13:21:24,125 INFO L226 Difference]: Without dead ends: 73 [2020-07-20 13:21:24,127 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 603 GetRequests, 570 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:21:24,127 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-07-20 13:21:24,148 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 46. [2020-07-20 13:21:24,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-20 13:21:24,152 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-20 13:21:24,153 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 299 [2020-07-20 13:21:24,154 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:24,154 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-20 13:21:24,154 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 13:21:24,154 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-20 13:21:24,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 508 [2020-07-20 13:21:24,167 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:24,168 INFO L422 BasicCegarLoop]: trace histogram [77, 77, 39, 38, 38, 38, 38, 38, 38, 38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:24,382 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:24,383 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:24,383 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:24,384 INFO L82 PathProgramCache]: Analyzing trace with hash 785285043, now seen corresponding path program 6 times [2020-07-20 13:21:24,384 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:24,385 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1751790602] [2020-07-20 13:21:24,385 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 13:21:24,590 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:24,590 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:24,593 INFO L263 TraceCheckSpWp]: Trace formula consists of 925 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 13:21:24,601 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:24,808 INFO L134 CoverageAnalysis]: Checked inductivity of 15219 backedges. 391 proven. 2126 refuted. 0 times theorem prover too weak. 12702 trivial. 0 not checked. [2020-07-20 13:21:24,809 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:26,762 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:27,274 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:27,672 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:27,876 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:27,877 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:27,958 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:28,007 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:28,008 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:28,213 INFO L134 CoverageAnalysis]: Checked inductivity of 15219 backedges. 391 proven. 2177 refuted. 0 times theorem prover too weak. 12651 trivial. 0 not checked. [2020-07-20 13:21:28,213 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1751790602] [2020-07-20 13:21:28,213 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:28,214 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-20 13:21:28,214 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1514738832] [2020-07-20 13:21:28,215 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 13:21:28,215 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:28,215 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 13:21:28,216 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-20 13:21:28,216 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 19 states. [2020-07-20 13:21:28,666 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:28,666 INFO L93 Difference]: Finished difference Result 82 states and 252 transitions. [2020-07-20 13:21:28,667 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 13:21:28,667 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 507 [2020-07-20 13:21:28,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:28,672 INFO L225 Difference]: With dead ends: 82 [2020-07-20 13:21:28,672 INFO L226 Difference]: Without dead ends: 78 [2020-07-20 13:21:28,673 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1021 GetRequests, 983 SyntacticMatches, 14 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=211, Invalid=439, Unknown=0, NotChecked=0, Total=650 [2020-07-20 13:21:28,674 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-07-20 13:21:28,684 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 51. [2020-07-20 13:21:28,684 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-20 13:21:28,686 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 109 transitions. [2020-07-20 13:21:28,686 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 109 transitions. Word has length 507 [2020-07-20 13:21:28,687 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:28,687 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 109 transitions. [2020-07-20 13:21:28,687 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 13:21:28,688 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 109 transitions. [2020-07-20 13:21:28,691 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 451 [2020-07-20 13:21:28,691 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:28,691 INFO L422 BasicCegarLoop]: trace histogram [65, 65, 53, 32, 32, 32, 32, 32, 32, 32, 21, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:28,904 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:28,905 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:28,906 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:28,906 INFO L82 PathProgramCache]: Analyzing trace with hash -1350718391, now seen corresponding path program 6 times [2020-07-20 13:21:28,906 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:28,907 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2091049838] [2020-07-20 13:21:28,907 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 13:21:29,116 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:29,116 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:29,120 INFO L263 TraceCheckSpWp]: Trace formula consists of 817 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 13:21:29,129 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:29,339 INFO L134 CoverageAnalysis]: Checked inductivity of 11682 backedges. 333 proven. 1918 refuted. 0 times theorem prover too weak. 9431 trivial. 0 not checked. [2020-07-20 13:21:29,339 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:31,052 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:31,662 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:31,663 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:31,992 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:31,993 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:32,142 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:32,234 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:32,235 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:32,279 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:32,415 INFO L134 CoverageAnalysis]: Checked inductivity of 11682 backedges. 333 proven. 1975 refuted. 0 times theorem prover too weak. 9374 trivial. 0 not checked. [2020-07-20 13:21:32,415 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2091049838] [2020-07-20 13:21:32,416 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:32,416 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-20 13:21:32,416 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [89781137] [2020-07-20 13:21:32,417 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 13:21:32,417 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:32,417 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 13:21:32,418 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-20 13:21:32,418 INFO L87 Difference]: Start difference. First operand 51 states and 109 transitions. Second operand 19 states. [2020-07-20 13:21:32,691 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:32,691 INFO L93 Difference]: Finished difference Result 87 states and 284 transitions. [2020-07-20 13:21:32,692 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 13:21:32,692 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 450 [2020-07-20 13:21:32,693 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:32,696 INFO L225 Difference]: With dead ends: 87 [2020-07-20 13:21:32,696 INFO L226 Difference]: Without dead ends: 83 [2020-07-20 13:21:32,698 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 906 GetRequests, 868 SyntacticMatches, 14 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=211, Invalid=439, Unknown=0, NotChecked=0, Total=650 [2020-07-20 13:21:32,699 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-07-20 13:21:32,717 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 51. [2020-07-20 13:21:32,718 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-20 13:21:32,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 109 transitions. [2020-07-20 13:21:32,721 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 109 transitions. Word has length 450 [2020-07-20 13:21:32,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:32,722 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 109 transitions. [2020-07-20 13:21:32,722 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 13:21:32,722 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 109 transitions. [2020-07-20 13:21:32,734 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1067 [2020-07-20 13:21:32,735 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:32,735 INFO L422 BasicCegarLoop]: trace histogram [163, 163, 82, 81, 81, 81, 81, 81, 81, 81, 81, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:32,949 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:32,950 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:32,950 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:32,951 INFO L82 PathProgramCache]: Analyzing trace with hash 40336450, now seen corresponding path program 7 times [2020-07-20 13:21:32,952 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:32,952 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1605211218] [2020-07-20 13:21:32,953 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 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 13:21:33,405 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:33,406 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:33,413 INFO L263 TraceCheckSpWp]: Trace formula consists of 1940 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 13:21:33,432 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:34,059 INFO L134 CoverageAnalysis]: Checked inductivity of 69012 backedges. 797 proven. 5632 refuted. 0 times theorem prover too weak. 62583 trivial. 0 not checked. [2020-07-20 13:21:34,059 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:37,814 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:37,815 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:39,114 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:39,616 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:39,617 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:39,945 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:39,946 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:40,100 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:40,102 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:40,198 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:40,199 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:40,258 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:40,826 INFO L134 CoverageAnalysis]: Checked inductivity of 69012 backedges. 797 proven. 5702 refuted. 0 times theorem prover too weak. 62513 trivial. 0 not checked. [2020-07-20 13:21:40,826 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1605211218] [2020-07-20 13:21:40,826 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:40,827 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-20 13:21:40,827 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [956849912] [2020-07-20 13:21:40,829 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 13:21:40,829 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:40,829 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 13:21:40,830 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-20 13:21:40,830 INFO L87 Difference]: Start difference. First operand 51 states and 109 transitions. Second operand 21 states. [2020-07-20 13:21:41,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:41,487 INFO L93 Difference]: Finished difference Result 92 states and 318 transitions. [2020-07-20 13:21:41,488 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 13:21:41,488 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1066 [2020-07-20 13:21:41,491 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:41,495 INFO L225 Difference]: With dead ends: 92 [2020-07-20 13:21:41,495 INFO L226 Difference]: Without dead ends: 88 [2020-07-20 13:21:41,501 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2140 GetRequests, 2097 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2020-07-20 13:21:41,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-07-20 13:21:41,520 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 56. [2020-07-20 13:21:41,520 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-20 13:21:41,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 130 transitions. [2020-07-20 13:21:41,522 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 130 transitions. Word has length 1066 [2020-07-20 13:21:41,523 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:41,523 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 130 transitions. [2020-07-20 13:21:41,523 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 13:21:41,524 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 130 transitions. [2020-07-20 13:21:41,530 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 657 [2020-07-20 13:21:41,530 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:41,531 INFO L422 BasicCegarLoop]: trace histogram [95, 95, 79, 47, 47, 47, 47, 47, 47, 47, 32, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:41,745 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:41,746 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:41,746 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:41,746 INFO L82 PathProgramCache]: Analyzing trace with hash -312379166, now seen corresponding path program 7 times [2020-07-20 13:21:41,747 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:41,747 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [549789003] [2020-07-20 13:21:41,747 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 13:21:42,035 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:42,035 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:42,039 INFO L263 TraceCheckSpWp]: Trace formula consists of 1186 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 13:21:42,049 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:42,489 INFO L134 CoverageAnalysis]: Checked inductivity of 25265 backedges. 501 proven. 3394 refuted. 0 times theorem prover too weak. 21370 trivial. 0 not checked. [2020-07-20 13:21:42,489 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:45,057 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:45,058 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:45,937 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:46,404 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:46,405 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:46,688 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:46,689 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:46,866 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:46,956 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:47,005 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:47,238 INFO L134 CoverageAnalysis]: Checked inductivity of 25265 backedges. 501 proven. 3471 refuted. 0 times theorem prover too weak. 21293 trivial. 0 not checked. [2020-07-20 13:21:47,239 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [549789003] [2020-07-20 13:21:47,239 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:47,239 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-20 13:21:47,240 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [393818367] [2020-07-20 13:21:47,241 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 13:21:47,241 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:47,242 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 13:21:47,242 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-20 13:21:47,242 INFO L87 Difference]: Start difference. First operand 56 states and 130 transitions. Second operand 21 states. [2020-07-20 13:21:47,736 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:47,736 INFO L93 Difference]: Finished difference Result 97 states and 354 transitions. [2020-07-20 13:21:47,737 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 13:21:47,737 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 656 [2020-07-20 13:21:47,739 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:47,743 INFO L225 Difference]: With dead ends: 97 [2020-07-20 13:21:47,744 INFO L226 Difference]: Without dead ends: 93 [2020-07-20 13:21:47,745 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1319 GetRequests, 1276 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2020-07-20 13:21:47,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-07-20 13:21:47,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 56. [2020-07-20 13:21:47,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-20 13:21:47,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 130 transitions. [2020-07-20 13:21:47,764 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 130 transitions. Word has length 656 [2020-07-20 13:21:47,765 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:47,765 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 130 transitions. [2020-07-20 13:21:47,765 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 13:21:47,765 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 130 transitions. [2020-07-20 13:21:47,785 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1275 [2020-07-20 13:21:47,785 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:47,786 INFO L422 BasicCegarLoop]: trace histogram [195, 195, 98, 97, 97, 97, 97, 97, 97, 97, 97, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:48,001 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:48,001 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:48,002 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:48,003 INFO L82 PathProgramCache]: Analyzing trace with hash 971855614, now seen corresponding path program 8 times [2020-07-20 13:21:48,003 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:48,004 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [241973568] [2020-07-20 13:21:48,004 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 13:21:48,503 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:48,504 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:48,514 INFO L263 TraceCheckSpWp]: Trace formula consists of 2317 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 13:21:48,534 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:49,306 INFO L134 CoverageAnalysis]: Checked inductivity of 98940 backedges. 1168 proven. 7570 refuted. 0 times theorem prover too weak. 90202 trivial. 0 not checked. [2020-07-20 13:21:49,307 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:21:53,802 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:55,612 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:56,494 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:57,100 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:57,101 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:57,419 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:57,420 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:57,622 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:57,707 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:57,708 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:57,758 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:57,759 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:21:58,462 INFO L134 CoverageAnalysis]: Checked inductivity of 98940 backedges. 1168 proven. 7662 refuted. 0 times theorem prover too weak. 90110 trivial. 0 not checked. [2020-07-20 13:21:58,463 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [241973568] [2020-07-20 13:21:58,463 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:21:58,464 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-20 13:21:58,464 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [352591342] [2020-07-20 13:21:58,466 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 13:21:58,466 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:58,466 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 13:21:58,467 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:21:58,467 INFO L87 Difference]: Start difference. First operand 56 states and 130 transitions. Second operand 23 states. [2020-07-20 13:21:59,199 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:59,199 INFO L93 Difference]: Finished difference Result 102 states and 392 transitions. [2020-07-20 13:21:59,206 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 13:21:59,206 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1274 [2020-07-20 13:21:59,209 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:59,212 INFO L225 Difference]: With dead ends: 102 [2020-07-20 13:21:59,212 INFO L226 Difference]: Without dead ends: 98 [2020-07-20 13:21:59,214 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2557 GetRequests, 2509 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2020-07-20 13:21:59,214 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-07-20 13:21:59,226 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 61. [2020-07-20 13:21:59,227 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-20 13:21:59,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 153 transitions. [2020-07-20 13:21:59,228 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 153 transitions. Word has length 1274 [2020-07-20 13:21:59,230 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:59,230 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 153 transitions. [2020-07-20 13:21:59,230 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 13:21:59,230 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 153 transitions. [2020-07-20 13:21:59,268 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1821 [2020-07-20 13:21:59,268 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:59,269 INFO L422 BasicCegarLoop]: trace histogram [267, 267, 211, 133, 133, 133, 133, 133, 133, 133, 78, 56, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:59,482 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:59,483 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:59,483 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:59,484 INFO L82 PathProgramCache]: Analyzing trace with hash 1926911020, now seen corresponding path program 8 times [2020-07-20 13:21:59,484 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:59,484 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [576822151] [2020-07-20 13:21:59,485 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 13:22:00,125 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:22:00,125 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:22:00,136 INFO L263 TraceCheckSpWp]: Trace formula consists of 3287 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 13:22:00,160 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:22:01,545 INFO L134 CoverageAnalysis]: Checked inductivity of 199311 backedges. 1523 proven. 11417 refuted. 0 times theorem prover too weak. 186371 trivial. 0 not checked. [2020-07-20 13:22:01,545 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:22:07,872 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:09,813 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:09,814 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:10,998 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:10,999 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:11,547 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:12,006 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:12,007 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:12,222 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:12,318 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:12,376 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:13,664 INFO L134 CoverageAnalysis]: Checked inductivity of 199311 backedges. 1523 proven. 11517 refuted. 0 times theorem prover too weak. 186271 trivial. 0 not checked. [2020-07-20 13:22:13,664 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [576822151] [2020-07-20 13:22:13,665 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:22:13,665 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 22 [2020-07-20 13:22:13,665 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2115321466] [2020-07-20 13:22:13,667 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-20 13:22:13,667 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:22:13,668 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-20 13:22:13,668 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=331, Unknown=0, NotChecked=0, Total=462 [2020-07-20 13:22:13,668 INFO L87 Difference]: Start difference. First operand 61 states and 153 transitions. Second operand 22 states. [2020-07-20 13:22:14,417 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:22:14,418 INFO L93 Difference]: Finished difference Result 107 states and 432 transitions. [2020-07-20 13:22:14,419 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 13:22:14,419 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 1820 [2020-07-20 13:22:14,422 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:22:14,426 INFO L225 Difference]: With dead ends: 107 [2020-07-20 13:22:14,426 INFO L226 Difference]: Without dead ends: 103 [2020-07-20 13:22:14,427 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3648 GetRequests, 3600 SyntacticMatches, 19 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 208 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=320, Invalid=610, Unknown=0, NotChecked=0, Total=930 [2020-07-20 13:22:14,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2020-07-20 13:22:14,442 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 61. [2020-07-20 13:22:14,443 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-20 13:22:14,444 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 153 transitions. [2020-07-20 13:22:14,444 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 153 transitions. Word has length 1820 [2020-07-20 13:22:14,446 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:22:14,446 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 153 transitions. [2020-07-20 13:22:14,446 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-20 13:22:14,446 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 153 transitions. [2020-07-20 13:22:14,483 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2029 [2020-07-20 13:22:14,483 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:22:14,484 INFO L422 BasicCegarLoop]: trace histogram [311, 311, 156, 155, 155, 155, 155, 155, 155, 155, 155, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:22:14,684 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:22:14,685 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:22:14,685 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:22:14,687 INFO L82 PathProgramCache]: Analyzing trace with hash -2013442466, now seen corresponding path program 9 times [2020-07-20 13:22:14,687 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:22:14,687 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [827252050] [2020-07-20 13:22:14,688 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 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 13:22:15,439 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:22:15,439 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:22:15,451 INFO L263 TraceCheckSpWp]: Trace formula consists of 3682 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 13:22:15,481 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:22:17,420 INFO L134 CoverageAnalysis]: Checked inductivity of 252495 backedges. 2059 proven. 13739 refuted. 0 times theorem prover too weak. 236697 trivial. 0 not checked. [2020-07-20 13:22:17,421 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:22:24,229 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:27,593 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:29,494 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:30,326 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:30,327 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:30,967 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:30,968 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:31,281 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:31,282 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:31,485 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:31,596 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:31,657 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:33,361 INFO L134 CoverageAnalysis]: Checked inductivity of 252495 backedges. 2059 proven. 13856 refuted. 0 times theorem prover too weak. 236580 trivial. 0 not checked. [2020-07-20 13:22:33,362 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [827252050] [2020-07-20 13:22:33,362 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:22:33,362 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 24 [2020-07-20 13:22:33,362 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [30411804] [2020-07-20 13:22:33,364 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-20 13:22:33,364 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:22:33,365 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-20 13:22:33,365 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=397, Unknown=0, NotChecked=0, Total=552 [2020-07-20 13:22:33,365 INFO L87 Difference]: Start difference. First operand 61 states and 153 transitions. Second operand 24 states. [2020-07-20 13:22:34,426 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:22:34,427 INFO L93 Difference]: Finished difference Result 112 states and 474 transitions. [2020-07-20 13:22:34,427 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 13:22:34,428 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 2028 [2020-07-20 13:22:34,430 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:22:34,434 INFO L225 Difference]: With dead ends: 112 [2020-07-20 13:22:34,434 INFO L226 Difference]: Without dead ends: 108 [2020-07-20 13:22:34,435 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4066 GetRequests, 4013 SyntacticMatches, 21 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 261 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=385, Invalid=737, Unknown=0, NotChecked=0, Total=1122 [2020-07-20 13:22:34,436 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-07-20 13:22:34,451 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 66. [2020-07-20 13:22:34,451 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-07-20 13:22:34,453 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 178 transitions. [2020-07-20 13:22:34,453 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 178 transitions. Word has length 2028 [2020-07-20 13:22:34,455 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:22:34,455 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 178 transitions. [2020-07-20 13:22:34,455 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-20 13:22:34,455 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 178 transitions. [2020-07-20 13:22:34,525 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3091 [2020-07-20 13:22:34,525 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:22:34,526 INFO L422 BasicCegarLoop]: trace histogram [453, 453, 365, 226, 226, 226, 226, 226, 226, 226, 139, 88, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:22:34,739 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:22:34,740 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:22:34,740 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:22:34,742 INFO L82 PathProgramCache]: Analyzing trace with hash 726071343, now seen corresponding path program 9 times [2020-07-20 13:22:34,743 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:22:34,743 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [505754707] [2020-07-20 13:22:34,743 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 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 13:22:35,780 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:22:35,780 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:22:35,794 INFO L263 TraceCheckSpWp]: Trace formula consists of 5580 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 13:22:35,832 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:22:40,332 INFO L134 CoverageAnalysis]: Checked inductivity of 577642 backedges. 3401 proven. 22322 refuted. 0 times theorem prover too weak. 551919 trivial. 0 not checked. [2020-07-20 13:22:40,333 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:22:49,777 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:55,158 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:55,159 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:57,975 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:22:59,239 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:00,027 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:00,331 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:00,515 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:00,641 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:00,641 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:00,712 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:00,790 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:04,207 INFO L134 CoverageAnalysis]: Checked inductivity of 577642 backedges. 3411 proven. 22429 refuted. 0 times theorem prover too weak. 551802 trivial. 0 not checked. [2020-07-20 13:23:04,208 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [505754707] [2020-07-20 13:23:04,208 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:23:04,209 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 24 [2020-07-20 13:23:04,209 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1407631742] [2020-07-20 13:23:04,211 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-20 13:23:04,211 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:23:04,211 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-20 13:23:04,212 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=397, Unknown=0, NotChecked=0, Total=552 [2020-07-20 13:23:04,212 INFO L87 Difference]: Start difference. First operand 66 states and 178 transitions. Second operand 24 states. [2020-07-20 13:23:04,823 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:23:04,824 INFO L93 Difference]: Finished difference Result 289 states and 3051 transitions. [2020-07-20 13:23:04,825 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 13:23:04,825 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 3090 [2020-07-20 13:23:04,828 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:23:04,840 INFO L225 Difference]: With dead ends: 289 [2020-07-20 13:23:04,840 INFO L226 Difference]: Without dead ends: 85 [2020-07-20 13:23:04,858 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6189 GetRequests, 6136 SyntacticMatches, 21 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 267 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=385, Invalid=737, Unknown=0, NotChecked=0, Total=1122 [2020-07-20 13:23:04,859 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2020-07-20 13:23:04,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 85. [2020-07-20 13:23:04,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-07-20 13:23:04,880 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 140 transitions. [2020-07-20 13:23:04,882 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 140 transitions. Word has length 3090 [2020-07-20 13:23:04,883 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:23:04,883 INFO L479 AbstractCegarLoop]: Abstraction has 85 states and 140 transitions. [2020-07-20 13:23:04,883 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-20 13:23:04,884 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 140 transitions. [2020-07-20 13:23:04,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1489 [2020-07-20 13:23:04,907 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:23:04,908 INFO L422 BasicCegarLoop]: trace histogram [215, 215, 191, 107, 107, 107, 107, 107, 107, 107, 84, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:23:05,121 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:23:05,122 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:23:05,124 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:23:05,125 INFO L82 PathProgramCache]: Analyzing trace with hash 114559272, now seen corresponding path program 10 times [2020-07-20 13:23:05,126 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:23:05,126 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1821349745] [2020-07-20 13:23:05,127 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 13:23:05,860 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:23:05,861 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:23:05,868 INFO L263 TraceCheckSpWp]: Trace formula consists of 2683 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 13:23:05,885 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:23:06,793 INFO L134 CoverageAnalysis]: Checked inductivity of 132849 backedges. 1654 proven. 8868 refuted. 0 times theorem prover too weak. 122327 trivial. 0 not checked. [2020-07-20 13:23:06,793 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:23:12,240 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:14,289 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:15,496 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:16,294 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:16,751 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:16,752 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:16,971 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:16,972 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:17,096 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:17,097 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:17,156 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:17,157 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:17,192 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:17,215 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:18,072 INFO L134 CoverageAnalysis]: Checked inductivity of 132849 backedges. 1678 proven. 8946 refuted. 0 times theorem prover too weak. 122225 trivial. 0 not checked. [2020-07-20 13:23:18,073 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1821349745] [2020-07-20 13:23:18,073 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:23:18,073 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 22 [2020-07-20 13:23:18,074 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1724197882] [2020-07-20 13:23:18,075 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-20 13:23:18,075 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:23:18,075 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-20 13:23:18,075 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=331, Unknown=0, NotChecked=0, Total=462 [2020-07-20 13:23:18,076 INFO L87 Difference]: Start difference. First operand 85 states and 140 transitions. Second operand 22 states. [2020-07-20 13:23:18,605 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:23:18,605 INFO L93 Difference]: Finished difference Result 294 states and 697 transitions. [2020-07-20 13:23:18,606 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 13:23:18,606 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 1488 [2020-07-20 13:23:18,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:23:18,612 INFO L225 Difference]: With dead ends: 294 [2020-07-20 13:23:18,612 INFO L226 Difference]: Without dead ends: 93 [2020-07-20 13:23:18,633 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2984 GetRequests, 2936 SyntacticMatches, 19 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 208 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=320, Invalid=610, Unknown=0, NotChecked=0, Total=930 [2020-07-20 13:23:18,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-07-20 13:23:18,649 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 82. [2020-07-20 13:23:18,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2020-07-20 13:23:18,651 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 117 transitions. [2020-07-20 13:23:18,651 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 117 transitions. Word has length 1488 [2020-07-20 13:23:18,652 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:23:18,652 INFO L479 AbstractCegarLoop]: Abstraction has 82 states and 117 transitions. [2020-07-20 13:23:18,652 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-20 13:23:18,652 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 117 transitions. [2020-07-20 13:23:18,668 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1213 [2020-07-20 13:23:18,669 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:23:18,669 INFO L422 BasicCegarLoop]: trace histogram [177, 177, 143, 88, 88, 88, 88, 88, 88, 88, 55, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:23:18,882 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:23:18,883 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:23:18,883 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:23:18,884 INFO L82 PathProgramCache]: Analyzing trace with hash 452920407, now seen corresponding path program 11 times [2020-07-20 13:23:18,885 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:23:18,885 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [94238553] [2020-07-20 13:23:18,885 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 13:23:19,594 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:23:19,595 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:23:19,626 INFO L263 TraceCheckSpWp]: Trace formula consists of 2692 conjuncts, 711 conjunts are in the unsatisfiable core [2020-07-20 13:23:19,647 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:23:21,277 INFO L134 CoverageAnalysis]: Checked inductivity of 87769 backedges. 0 proven. 28921 refuted. 0 times theorem prover too weak. 58848 trivial. 0 not checked. [2020-07-20 13:23:21,277 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:23:31,907 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 6 [2020-07-20 13:23:45,287 INFO L134 CoverageAnalysis]: Checked inductivity of 87769 backedges. 0 proven. 28921 refuted. 0 times theorem prover too weak. 58848 trivial. 0 not checked. [2020-07-20 13:23:45,288 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [94238553] [2020-07-20 13:23:45,288 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:23:45,288 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31] total 40 [2020-07-20 13:23:45,288 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [779432701] [2020-07-20 13:23:45,289 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-07-20 13:23:45,289 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:23:45,289 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-07-20 13:23:45,290 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=1465, Unknown=0, NotChecked=0, Total=1560 [2020-07-20 13:23:45,290 INFO L87 Difference]: Start difference. First operand 82 states and 117 transitions. Second operand 40 states. [2020-07-20 13:23:46,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:23:46,512 INFO L93 Difference]: Finished difference Result 173 states and 302 transitions. [2020-07-20 13:23:46,516 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-07-20 13:23:46,516 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 1212 [2020-07-20 13:23:46,517 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:23:46,523 INFO L225 Difference]: With dead ends: 173 [2020-07-20 13:23:46,523 INFO L226 Difference]: Without dead ends: 166 [2020-07-20 13:23:46,528 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2425 GetRequests, 2339 SyntacticMatches, 46 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 469 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=103, Invalid=1619, Unknown=0, NotChecked=0, Total=1722 [2020-07-20 13:23:46,529 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2020-07-20 13:23:46,558 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 137. [2020-07-20 13:23:46,559 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 137 states. [2020-07-20 13:23:46,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 245 transitions. [2020-07-20 13:23:46,562 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 245 transitions. Word has length 1212 [2020-07-20 13:23:46,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:23:46,564 INFO L479 AbstractCegarLoop]: Abstraction has 137 states and 245 transitions. [2020-07-20 13:23:46,564 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-07-20 13:23:46,564 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 245 transitions. [2020-07-20 13:23:46,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1414 [2020-07-20 13:23:46,589 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:23:46,590 INFO L422 BasicCegarLoop]: trace histogram [209, 209, 152, 104, 104, 104, 104, 104, 104, 104, 57, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:23:46,804 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:23:46,805 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:23:46,805 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:23:46,806 INFO L82 PathProgramCache]: Analyzing trace with hash -1928433851, now seen corresponding path program 12 times [2020-07-20 13:23:46,807 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:23:46,807 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2094026654] [2020-07-20 13:23:46,807 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 13:23:47,569 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:23:47,569 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:23:47,576 INFO L263 TraceCheckSpWp]: Trace formula consists of 2560 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 13:23:47,589 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:23:48,482 INFO L134 CoverageAnalysis]: Checked inductivity of 119844 backedges. 1706 proven. 9302 refuted. 0 times theorem prover too weak. 108836 trivial. 0 not checked. [2020-07-20 13:23:48,482 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:23:54,707 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:54,707 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:57,105 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:57,106 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:58,715 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:58,716 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:59,687 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:23:59,688 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:00,273 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:00,274 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:00,620 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:00,621 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:00,791 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:00,792 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:00,901 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:00,964 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:01,022 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:01,833 INFO L134 CoverageAnalysis]: Checked inductivity of 119844 backedges. 1718 proven. 9416 refuted. 0 times theorem prover too weak. 108710 trivial. 0 not checked. [2020-07-20 13:24:01,834 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2094026654] [2020-07-20 13:24:01,834 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:24:01,835 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 24 [2020-07-20 13:24:01,835 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1617946742] [2020-07-20 13:24:01,837 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-20 13:24:01,837 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:24:01,837 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-20 13:24:01,837 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=397, Unknown=0, NotChecked=0, Total=552 [2020-07-20 13:24:01,838 INFO L87 Difference]: Start difference. First operand 137 states and 245 transitions. Second operand 24 states. [2020-07-20 13:24:02,438 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:24:02,439 INFO L93 Difference]: Finished difference Result 401 states and 971 transitions. [2020-07-20 13:24:02,441 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 13:24:02,441 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 1413 [2020-07-20 13:24:02,443 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:24:02,450 INFO L225 Difference]: With dead ends: 401 [2020-07-20 13:24:02,450 INFO L226 Difference]: Without dead ends: 137 [2020-07-20 13:24:02,474 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2835 GetRequests, 2782 SyntacticMatches, 21 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 261 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=385, Invalid=737, Unknown=0, NotChecked=0, Total=1122 [2020-07-20 13:24:02,474 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2020-07-20 13:24:02,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 131. [2020-07-20 13:24:02,496 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 131 states. [2020-07-20 13:24:02,499 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 215 transitions. [2020-07-20 13:24:02,500 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 215 transitions. Word has length 1413 [2020-07-20 13:24:02,500 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:24:02,501 INFO L479 AbstractCegarLoop]: Abstraction has 131 states and 215 transitions. [2020-07-20 13:24:02,501 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-20 13:24:02,501 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 215 transitions. [2020-07-20 13:24:02,528 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1528 [2020-07-20 13:24:02,528 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:24:02,529 INFO L422 BasicCegarLoop]: trace histogram [227, 227, 158, 113, 113, 113, 113, 113, 113, 113, 69, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:24:02,742 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:24:02,743 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:24:02,743 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:24:02,745 INFO L82 PathProgramCache]: Analyzing trace with hash -669391024, now seen corresponding path program 13 times [2020-07-20 13:24:02,745 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:24:02,745 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1729277516] [2020-07-20 13:24:02,746 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 13:24:03,581 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:24:03,581 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:24:03,590 INFO L263 TraceCheckSpWp]: Trace formula consists of 2765 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 13:24:03,607 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:24:04,611 INFO L134 CoverageAnalysis]: Checked inductivity of 140319 backedges. 2217 proven. 9715 refuted. 0 times theorem prover too weak. 128387 trivial. 0 not checked. [2020-07-20 13:24:04,611 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:24:11,413 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:11,413 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:13,994 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:15,831 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:16,371 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 19 [2020-07-20 13:24:16,866 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:16,867 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:17,319 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:17,320 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:17,640 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:17,641 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:17,839 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:17,840 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:17,949 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:18,013 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:18,139 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:19,238 INFO L134 CoverageAnalysis]: Checked inductivity of 140319 backedges. 2225 proven. 9833 refuted. 0 times theorem prover too weak. 128261 trivial. 0 not checked. [2020-07-20 13:24:19,239 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1729277516] [2020-07-20 13:24:19,239 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:24:19,239 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 24 [2020-07-20 13:24:19,240 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [77348638] [2020-07-20 13:24:19,241 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-20 13:24:19,241 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:24:19,241 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-20 13:24:19,242 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=397, Unknown=0, NotChecked=0, Total=552 [2020-07-20 13:24:19,242 INFO L87 Difference]: Start difference. First operand 131 states and 215 transitions. Second operand 24 states. [2020-07-20 13:24:19,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:24:19,694 INFO L93 Difference]: Finished difference Result 215 states and 364 transitions. [2020-07-20 13:24:19,696 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 13:24:19,696 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 1527 [2020-07-20 13:24:19,697 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:24:19,702 INFO L225 Difference]: With dead ends: 215 [2020-07-20 13:24:19,702 INFO L226 Difference]: Without dead ends: 168 [2020-07-20 13:24:19,712 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3063 GetRequests, 3010 SyntacticMatches, 21 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 261 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=385, Invalid=737, Unknown=0, NotChecked=0, Total=1122 [2020-07-20 13:24:19,712 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2020-07-20 13:24:19,738 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 141. [2020-07-20 13:24:19,738 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 141 states. [2020-07-20 13:24:19,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 235 transitions. [2020-07-20 13:24:19,743 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 235 transitions. Word has length 1527 [2020-07-20 13:24:19,744 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:24:19,744 INFO L479 AbstractCegarLoop]: Abstraction has 141 states and 235 transitions. [2020-07-20 13:24:19,744 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-20 13:24:19,744 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 235 transitions. [2020-07-20 13:24:19,769 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1249 [2020-07-20 13:24:19,769 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:24:19,770 INFO L422 BasicCegarLoop]: trace histogram [183, 183, 143, 91, 91, 91, 91, 91, 91, 91, 52, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:24:19,983 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:24:19,984 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:24:19,985 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:24:19,985 INFO L82 PathProgramCache]: Analyzing trace with hash 1698266680, now seen corresponding path program 14 times [2020-07-20 13:24:19,986 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:24:19,986 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [555714474] [2020-07-20 13:24:19,987 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 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 13:24:20,784 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:24:20,784 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:24:20,792 INFO L263 TraceCheckSpWp]: Trace formula consists of 2256 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-20 13:24:20,803 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:24:21,586 INFO L134 CoverageAnalysis]: Checked inductivity of 93145 backedges. 1977 proven. 6111 refuted. 0 times theorem prover too weak. 85057 trivial. 0 not checked. [2020-07-20 13:24:21,586 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:24:26,700 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:28,764 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:29,973 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:30,339 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:30,340 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:30,628 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:30,629 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:30,771 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:30,859 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:30,860 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:30,953 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:31,111 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:32,149 INFO L134 CoverageAnalysis]: Checked inductivity of 93145 backedges. 1984 proven. 6176 refuted. 0 times theorem prover too weak. 84985 trivial. 0 not checked. [2020-07-20 13:24:32,149 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [555714474] [2020-07-20 13:24:32,150 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:24:32,150 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 20] total 22 [2020-07-20 13:24:32,151 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [408324128] [2020-07-20 13:24:32,152 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-20 13:24:32,152 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:24:32,152 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-20 13:24:32,153 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=330, Unknown=0, NotChecked=0, Total=462 [2020-07-20 13:24:32,153 INFO L87 Difference]: Start difference. First operand 141 states and 235 transitions. Second operand 22 states. [2020-07-20 13:24:32,525 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:24:32,525 INFO L93 Difference]: Finished difference Result 198 states and 329 transitions. [2020-07-20 13:24:32,526 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 13:24:32,527 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 1248 [2020-07-20 13:24:32,528 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:24:32,531 INFO L225 Difference]: With dead ends: 198 [2020-07-20 13:24:32,531 INFO L226 Difference]: Without dead ends: 176 [2020-07-20 13:24:32,535 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2503 GetRequests, 2458 SyntacticMatches, 17 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 215 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=300, Invalid=570, Unknown=0, NotChecked=0, Total=870 [2020-07-20 13:24:32,535 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 176 states. [2020-07-20 13:24:32,559 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 176 to 167. [2020-07-20 13:24:32,560 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 167 states. [2020-07-20 13:24:32,563 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 285 transitions. [2020-07-20 13:24:32,564 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 285 transitions. Word has length 1248 [2020-07-20 13:24:32,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:24:32,564 INFO L479 AbstractCegarLoop]: Abstraction has 167 states and 285 transitions. [2020-07-20 13:24:32,565 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-20 13:24:32,565 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 285 transitions. [2020-07-20 13:24:32,590 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1311 [2020-07-20 13:24:32,590 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:24:32,591 INFO L422 BasicCegarLoop]: trace histogram [193, 193, 145, 96, 96, 96, 96, 96, 96, 96, 49, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:24:32,805 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:24:32,806 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:24:32,806 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:24:32,807 INFO L82 PathProgramCache]: Analyzing trace with hash 1030698009, now seen corresponding path program 15 times [2020-07-20 13:24:32,807 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:24:32,807 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1149487803] [2020-07-20 13:24:32,807 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 13:24:33,672 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:24:33,673 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:24:33,681 INFO L263 TraceCheckSpWp]: Trace formula consists of 2371 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 13:24:33,696 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:24:34,591 INFO L134 CoverageAnalysis]: Checked inductivity of 102792 backedges. 2215 proven. 6947 refuted. 0 times theorem prover too weak. 93630 trivial. 0 not checked. [2020-07-20 13:24:34,592 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:24:40,820 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:42,953 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:44,293 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:44,787 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:44,788 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:45,185 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:45,186 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:45,400 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:45,518 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:45,519 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:45,579 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:45,619 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:45,790 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:24:47,107 INFO L134 CoverageAnalysis]: Checked inductivity of 102792 backedges. 2233 proven. 7031 refuted. 0 times theorem prover too weak. 93528 trivial. 0 not checked. [2020-07-20 13:24:47,107 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1149487803] [2020-07-20 13:24:47,107 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:24:47,108 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 22 [2020-07-20 13:24:47,108 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1605301527] [2020-07-20 13:24:47,109 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-20 13:24:47,109 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:24:47,109 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-20 13:24:47,110 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=331, Unknown=0, NotChecked=0, Total=462 [2020-07-20 13:24:47,110 INFO L87 Difference]: Start difference. First operand 167 states and 285 transitions. Second operand 22 states. [2020-07-20 13:24:47,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:24:47,636 INFO L93 Difference]: Finished difference Result 268 states and 458 transitions. [2020-07-20 13:24:47,638 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 13:24:47,638 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 1310 [2020-07-20 13:24:47,640 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:24:47,648 INFO L225 Difference]: With dead ends: 268 [2020-07-20 13:24:47,649 INFO L226 Difference]: Without dead ends: 246 [2020-07-20 13:24:47,657 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2628 GetRequests, 2580 SyntacticMatches, 19 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 208 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=320, Invalid=610, Unknown=0, NotChecked=0, Total=930 [2020-07-20 13:24:47,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 246 states. [2020-07-20 13:24:47,701 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 246 to 162. [2020-07-20 13:24:47,702 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 162 states. [2020-07-20 13:24:47,707 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 275 transitions. [2020-07-20 13:24:47,707 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 275 transitions. Word has length 1310 [2020-07-20 13:24:47,708 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:24:47,709 INFO L479 AbstractCegarLoop]: Abstraction has 162 states and 275 transitions. [2020-07-20 13:24:47,709 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-20 13:24:47,709 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 275 transitions. [2020-07-20 13:24:47,745 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1381 [2020-07-20 13:24:47,746 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:24:47,747 INFO L422 BasicCegarLoop]: trace histogram [205, 205, 143, 102, 102, 102, 102, 102, 102, 102, 62, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:24:47,962 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:24:47,963 INFO L427 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:24:47,963 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:24:47,964 INFO L82 PathProgramCache]: Analyzing trace with hash -1994259647, now seen corresponding path program 16 times [2020-07-20 13:24:47,964 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:24:47,964 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2038913341] [2020-07-20 13:24:47,964 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 13:24:48,846 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:24:48,847 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:24:48,854 INFO L263 TraceCheckSpWp]: Trace formula consists of 2498 conjuncts, 21 conjunts are in the unsatisfiable core [2020-07-20 13:24:48,866 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:24:50,714 INFO L134 CoverageAnalysis]: Checked inductivity of 114397 backedges. 1650 proven. 8392 refuted. 0 times theorem prover too weak. 104355 trivial. 0 not checked. [2020-07-20 13:24:50,714 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:24:57,494 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:00,049 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:01,581 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:01,582 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:02,629 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:02,630 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:03,205 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:03,649 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:03,825 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:03,940 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:04,052 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:04,961 INFO L134 CoverageAnalysis]: Checked inductivity of 114397 backedges. 1654 proven. 8480 refuted. 0 times theorem prover too weak. 104263 trivial. 0 not checked. [2020-07-20 13:25:04,961 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2038913341] [2020-07-20 13:25:04,961 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:25:04,962 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 22] total 24 [2020-07-20 13:25:04,962 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1818865895] [2020-07-20 13:25:04,963 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-20 13:25:04,963 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:25:04,964 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-20 13:25:04,964 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=156, Invalid=396, Unknown=0, NotChecked=0, Total=552 [2020-07-20 13:25:04,964 INFO L87 Difference]: Start difference. First operand 162 states and 275 transitions. Second operand 24 states. [2020-07-20 13:25:05,692 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:25:05,692 INFO L93 Difference]: Finished difference Result 363 states and 667 transitions. [2020-07-20 13:25:05,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 13:25:05,695 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 1380 [2020-07-20 13:25:05,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:25:05,702 INFO L225 Difference]: With dead ends: 363 [2020-07-20 13:25:05,702 INFO L226 Difference]: Without dead ends: 159 [2020-07-20 13:25:05,719 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2768 GetRequests, 2718 SyntacticMatches, 19 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 269 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=363, Invalid=693, Unknown=0, NotChecked=0, Total=1056 [2020-07-20 13:25:05,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 159 states. [2020-07-20 13:25:05,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 159 to 159. [2020-07-20 13:25:05,753 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 159 states. [2020-07-20 13:25:05,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 253 transitions. [2020-07-20 13:25:05,761 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 253 transitions. Word has length 1380 [2020-07-20 13:25:05,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:25:05,762 INFO L479 AbstractCegarLoop]: Abstraction has 159 states and 253 transitions. [2020-07-20 13:25:05,763 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-20 13:25:05,763 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 253 transitions. [2020-07-20 13:25:05,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1333 [2020-07-20 13:25:05,799 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:25:05,800 INFO L422 BasicCegarLoop]: trace histogram [197, 197, 143, 98, 98, 98, 98, 98, 98, 98, 54, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:25:06,016 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:25:06,017 INFO L427 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:25:06,018 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:25:06,018 INFO L82 PathProgramCache]: Analyzing trace with hash -1859060873, now seen corresponding path program 17 times [2020-07-20 13:25:06,019 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:25:06,019 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [658235217] [2020-07-20 13:25:06,019 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 13:25:06,958 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:25:06,959 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:25:06,967 INFO L263 TraceCheckSpWp]: Trace formula consists of 2410 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-20 13:25:06,978 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:25:07,855 INFO L134 CoverageAnalysis]: Checked inductivity of 106389 backedges. 1732 proven. 6916 refuted. 0 times theorem prover too weak. 97741 trivial. 0 not checked. [2020-07-20 13:25:07,855 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:25:14,003 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:16,203 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:17,567 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:17,567 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:18,321 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:18,322 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:18,586 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:18,780 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:18,781 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:18,869 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:18,870 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:18,965 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:19,062 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:19,977 INFO L134 CoverageAnalysis]: Checked inductivity of 106389 backedges. 1743 proven. 6977 refuted. 0 times theorem prover too weak. 97669 trivial. 0 not checked. [2020-07-20 13:25:19,978 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [658235217] [2020-07-20 13:25:19,978 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:25:19,979 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 20] total 22 [2020-07-20 13:25:19,979 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [806841983] [2020-07-20 13:25:19,980 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-20 13:25:19,980 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:25:19,980 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-20 13:25:19,980 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=330, Unknown=0, NotChecked=0, Total=462 [2020-07-20 13:25:19,981 INFO L87 Difference]: Start difference. First operand 159 states and 253 transitions. Second operand 22 states. [2020-07-20 13:25:20,530 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:25:20,530 INFO L93 Difference]: Finished difference Result 234 states and 373 transitions. [2020-07-20 13:25:20,532 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 13:25:20,532 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 1332 [2020-07-20 13:25:20,534 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:25:20,540 INFO L225 Difference]: With dead ends: 234 [2020-07-20 13:25:20,540 INFO L226 Difference]: Without dead ends: 207 [2020-07-20 13:25:20,545 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2671 GetRequests, 2626 SyntacticMatches, 17 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 215 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=300, Invalid=570, Unknown=0, NotChecked=0, Total=870 [2020-07-20 13:25:20,545 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 207 states. [2020-07-20 13:25:20,573 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 207 to 162. [2020-07-20 13:25:20,573 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 162 states. [2020-07-20 13:25:20,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 259 transitions. [2020-07-20 13:25:20,577 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 259 transitions. Word has length 1332 [2020-07-20 13:25:20,578 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:25:20,578 INFO L479 AbstractCegarLoop]: Abstraction has 162 states and 259 transitions. [2020-07-20 13:25:20,578 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-20 13:25:20,578 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 259 transitions. [2020-07-20 13:25:20,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1249 [2020-07-20 13:25:20,603 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:25:20,604 INFO L422 BasicCegarLoop]: trace histogram [183, 183, 143, 91, 91, 91, 91, 91, 91, 91, 52, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:25:20,819 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:25:20,820 INFO L427 AbstractCegarLoop]: === Iteration 29 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:25:20,820 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:25:20,821 INFO L82 PathProgramCache]: Analyzing trace with hash -1644911082, now seen corresponding path program 18 times [2020-07-20 13:25:20,822 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:25:20,822 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1629362725] [2020-07-20 13:25:20,822 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 13:25:21,781 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:25:21,781 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:25:21,789 INFO L263 TraceCheckSpWp]: Trace formula consists of 2255 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-20 13:25:21,799 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:25:22,594 INFO L134 CoverageAnalysis]: Checked inductivity of 93145 backedges. 1503 proven. 6585 refuted. 0 times theorem prover too weak. 85057 trivial. 0 not checked. [2020-07-20 13:25:22,595 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:25:28,348 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:28,349 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:30,537 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:30,538 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:31,830 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:31,831 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:32,572 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:32,573 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:33,091 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 23 [2020-07-20 13:25:33,130 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:33,298 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:33,390 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:33,391 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:33,480 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:33,544 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:34,181 INFO L134 CoverageAnalysis]: Checked inductivity of 93145 backedges. 1516 proven. 6644 refuted. 0 times theorem prover too weak. 84985 trivial. 0 not checked. [2020-07-20 13:25:34,182 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1629362725] [2020-07-20 13:25:34,182 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:25:34,182 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 20] total 22 [2020-07-20 13:25:34,183 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1599858528] [2020-07-20 13:25:34,184 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-20 13:25:34,184 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:25:34,184 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-20 13:25:34,184 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=330, Unknown=0, NotChecked=0, Total=462 [2020-07-20 13:25:34,185 INFO L87 Difference]: Start difference. First operand 162 states and 259 transitions. Second operand 22 states. [2020-07-20 13:25:34,684 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:25:34,684 INFO L93 Difference]: Finished difference Result 222 states and 360 transitions. [2020-07-20 13:25:34,686 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 13:25:34,687 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 1248 [2020-07-20 13:25:34,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:25:34,693 INFO L225 Difference]: With dead ends: 222 [2020-07-20 13:25:34,693 INFO L226 Difference]: Without dead ends: 187 [2020-07-20 13:25:34,700 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2503 GetRequests, 2458 SyntacticMatches, 17 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 215 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=300, Invalid=570, Unknown=0, NotChecked=0, Total=870 [2020-07-20 13:25:34,701 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2020-07-20 13:25:34,732 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 159. [2020-07-20 13:25:34,733 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 159 states. [2020-07-20 13:25:34,736 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 253 transitions. [2020-07-20 13:25:34,737 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 253 transitions. Word has length 1248 [2020-07-20 13:25:34,737 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:25:34,737 INFO L479 AbstractCegarLoop]: Abstraction has 159 states and 253 transitions. [2020-07-20 13:25:34,737 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-20 13:25:34,737 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 253 transitions. [2020-07-20 13:25:34,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1273 [2020-07-20 13:25:34,766 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:25:34,767 INFO L422 BasicCegarLoop]: trace histogram [187, 187, 143, 93, 93, 93, 93, 93, 93, 93, 50, 44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:25:34,982 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:25:34,982 INFO L427 AbstractCegarLoop]: === Iteration 30 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:25:34,983 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:25:34,983 INFO L82 PathProgramCache]: Analyzing trace with hash 357114220, now seen corresponding path program 19 times [2020-07-20 13:25:34,983 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:25:34,984 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1213083666] [2020-07-20 13:25:34,984 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 13:25:35,960 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:25:35,960 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:25:35,967 INFO L263 TraceCheckSpWp]: Trace formula consists of 2300 conjuncts, 21 conjunts are in the unsatisfiable core [2020-07-20 13:25:35,977 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:25:36,787 INFO L134 CoverageAnalysis]: Checked inductivity of 96829 backedges. 1628 proven. 7604 refuted. 0 times theorem prover too weak. 87597 trivial. 0 not checked. [2020-07-20 13:25:36,788 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:25:43,532 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:45,798 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:47,313 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:47,314 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:48,199 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:48,200 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:48,769 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:48,769 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:49,005 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:49,006 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:49,162 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:49,253 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:49,376 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:25:50,675 INFO L134 CoverageAnalysis]: Checked inductivity of 96829 backedges. 1630 proven. 7694 refuted. 0 times theorem prover too weak. 87505 trivial. 0 not checked. [2020-07-20 13:25:50,675 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1213083666] [2020-07-20 13:25:50,675 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:25:50,676 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 22] total 24 [2020-07-20 13:25:50,676 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1001198906] [2020-07-20 13:25:50,677 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-20 13:25:50,677 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:25:50,677 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-20 13:25:50,678 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=156, Invalid=396, Unknown=0, NotChecked=0, Total=552 [2020-07-20 13:25:50,678 INFO L87 Difference]: Start difference. First operand 159 states and 253 transitions. Second operand 24 states. [2020-07-20 13:25:51,158 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:25:51,158 INFO L93 Difference]: Finished difference Result 203 states and 318 transitions. [2020-07-20 13:25:51,159 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 13:25:51,159 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 1272 [2020-07-20 13:25:51,161 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:25:51,166 INFO L225 Difference]: With dead ends: 203 [2020-07-20 13:25:51,166 INFO L226 Difference]: Without dead ends: 168 [2020-07-20 13:25:51,170 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2552 GetRequests, 2502 SyntacticMatches, 19 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 269 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=363, Invalid=693, Unknown=0, NotChecked=0, Total=1056 [2020-07-20 13:25:51,170 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2020-07-20 13:25:51,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 159. [2020-07-20 13:25:51,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 159 states. [2020-07-20 13:25:51,192 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 250 transitions. [2020-07-20 13:25:51,192 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 250 transitions. Word has length 1272 [2020-07-20 13:25:51,192 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:25:51,193 INFO L479 AbstractCegarLoop]: Abstraction has 159 states and 250 transitions. [2020-07-20 13:25:51,193 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-20 13:25:51,193 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 250 transitions. [2020-07-20 13:25:51,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1263 [2020-07-20 13:25:51,211 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:25:51,211 INFO L422 BasicCegarLoop]: trace histogram [185, 185, 145, 92, 92, 92, 92, 92, 92, 92, 53, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:25:51,425 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:25:51,426 INFO L427 AbstractCegarLoop]: === Iteration 31 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:25:51,426 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:25:51,427 INFO L82 PathProgramCache]: Analyzing trace with hash -110795933, now seen corresponding path program 20 times [2020-07-20 13:25:51,427 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:25:51,427 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [548460779] [2020-07-20 13:25:51,427 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 13:25:52,368 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:25:52,368 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:25:52,372 INFO L263 TraceCheckSpWp]: Trace formula consists of 2284 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 13:25:52,380 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:25:53,029 INFO L134 CoverageAnalysis]: Checked inductivity of 95264 backedges. 2669 proven. 6149 refuted. 0 times theorem prover too weak. 86446 trivial. 0 not checked. [2020-07-20 13:25:53,029 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:25:58,924 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:01,226 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:01,227 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:01,951 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:01,952 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:02,563 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:02,564 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:02,930 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:02,931 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:03,146 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:03,271 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:03,272 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:03,336 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:03,377 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:03,615 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:05,022 INFO L134 CoverageAnalysis]: Checked inductivity of 95264 backedges. 2685 proven. 6235 refuted. 0 times theorem prover too weak. 86344 trivial. 0 not checked. [2020-07-20 13:26:05,022 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [548460779] [2020-07-20 13:26:05,022 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:26:05,022 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 22 [2020-07-20 13:26:05,023 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1574655859] [2020-07-20 13:26:05,024 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-20 13:26:05,024 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:26:05,024 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-20 13:26:05,024 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=331, Unknown=0, NotChecked=0, Total=462 [2020-07-20 13:26:05,024 INFO L87 Difference]: Start difference. First operand 159 states and 250 transitions. Second operand 22 states. [2020-07-20 13:26:05,442 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:26:05,442 INFO L93 Difference]: Finished difference Result 223 states and 349 transitions. [2020-07-20 13:26:05,444 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 13:26:05,444 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 1262 [2020-07-20 13:26:05,445 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:26:05,448 INFO L225 Difference]: With dead ends: 223 [2020-07-20 13:26:05,449 INFO L226 Difference]: Without dead ends: 206 [2020-07-20 13:26:05,452 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2532 GetRequests, 2484 SyntacticMatches, 19 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 208 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=320, Invalid=610, Unknown=0, NotChecked=0, Total=930 [2020-07-20 13:26:05,452 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 206 states. [2020-07-20 13:26:05,473 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 206 to 164. [2020-07-20 13:26:05,473 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 164 states. [2020-07-20 13:26:05,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 164 states to 164 states and 257 transitions. [2020-07-20 13:26:05,476 INFO L78 Accepts]: Start accepts. Automaton has 164 states and 257 transitions. Word has length 1262 [2020-07-20 13:26:05,477 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:26:05,477 INFO L479 AbstractCegarLoop]: Abstraction has 164 states and 257 transitions. [2020-07-20 13:26:05,477 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-20 13:26:05,477 INFO L276 IsEmpty]: Start isEmpty. Operand 164 states and 257 transitions. [2020-07-20 13:26:05,495 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1285 [2020-07-20 13:26:05,495 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:26:05,495 INFO L422 BasicCegarLoop]: trace histogram [189, 189, 143, 94, 94, 94, 94, 94, 94, 94, 49, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:26:05,705 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:26:05,706 INFO L427 AbstractCegarLoop]: === Iteration 32 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:26:05,706 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:26:05,707 INFO L82 PathProgramCache]: Analyzing trace with hash 177302829, now seen corresponding path program 21 times [2020-07-20 13:26:05,707 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:26:05,708 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [32612251] [2020-07-20 13:26:05,708 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 13:26:06,694 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:26:06,694 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:26:06,698 INFO L263 TraceCheckSpWp]: Trace formula consists of 2322 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-20 13:26:06,706 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:26:07,366 INFO L134 CoverageAnalysis]: Checked inductivity of 98701 backedges. 1965 proven. 6363 refuted. 0 times theorem prover too weak. 90373 trivial. 0 not checked. [2020-07-20 13:26:07,366 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:26:13,246 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:15,534 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:16,890 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:16,891 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:17,296 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:17,296 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:17,625 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:17,819 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:17,820 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:17,914 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:17,915 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:18,013 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:18,168 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:19,140 INFO L134 CoverageAnalysis]: Checked inductivity of 98701 backedges. 1974 proven. 6426 refuted. 0 times theorem prover too weak. 90301 trivial. 0 not checked. [2020-07-20 13:26:19,141 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [32612251] [2020-07-20 13:26:19,141 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:26:19,141 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 20] total 22 [2020-07-20 13:26:19,141 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1679482485] [2020-07-20 13:26:19,142 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-20 13:26:19,142 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:26:19,143 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-20 13:26:19,143 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=330, Unknown=0, NotChecked=0, Total=462 [2020-07-20 13:26:19,143 INFO L87 Difference]: Start difference. First operand 164 states and 257 transitions. Second operand 22 states. [2020-07-20 13:26:19,596 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:26:19,597 INFO L93 Difference]: Finished difference Result 269 states and 433 transitions. [2020-07-20 13:26:19,598 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 13:26:19,599 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 1284 [2020-07-20 13:26:19,600 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:26:19,605 INFO L225 Difference]: With dead ends: 269 [2020-07-20 13:26:19,605 INFO L226 Difference]: Without dead ends: 232 [2020-07-20 13:26:19,608 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2575 GetRequests, 2530 SyntacticMatches, 17 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 215 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=300, Invalid=570, Unknown=0, NotChecked=0, Total=870 [2020-07-20 13:26:19,608 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 232 states. [2020-07-20 13:26:19,633 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 232 to 190. [2020-07-20 13:26:19,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 190 states. [2020-07-20 13:26:19,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 301 transitions. [2020-07-20 13:26:19,637 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 301 transitions. Word has length 1284 [2020-07-20 13:26:19,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:26:19,638 INFO L479 AbstractCegarLoop]: Abstraction has 190 states and 301 transitions. [2020-07-20 13:26:19,638 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-20 13:26:19,638 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 301 transitions. [2020-07-20 13:26:19,657 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1237 [2020-07-20 13:26:19,657 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:26:19,658 INFO L422 BasicCegarLoop]: trace histogram [181, 181, 143, 90, 90, 90, 90, 90, 90, 90, 53, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:26:19,870 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:26:19,871 INFO L427 AbstractCegarLoop]: === Iteration 33 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:26:19,871 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:26:19,872 INFO L82 PathProgramCache]: Analyzing trace with hash -1826043071, now seen corresponding path program 22 times [2020-07-20 13:26:19,872 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:26:19,873 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [207329626] [2020-07-20 13:26:19,873 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 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 13:26:20,861 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:26:20,861 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:26:20,866 INFO L263 TraceCheckSpWp]: Trace formula consists of 2234 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-20 13:26:20,874 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:26:21,515 INFO L134 CoverageAnalysis]: Checked inductivity of 91333 backedges. 2770 proven. 5238 refuted. 0 times theorem prover too weak. 83325 trivial. 0 not checked. [2020-07-20 13:26:21,515 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:26:27,450 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:29,673 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:30,329 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:30,330 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:30,702 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:30,703 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:30,976 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:30,976 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:31,137 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:31,138 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:31,237 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:31,407 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:31,841 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:33,240 INFO L134 CoverageAnalysis]: Checked inductivity of 91333 backedges. 2771 proven. 5309 refuted. 0 times theorem prover too weak. 83253 trivial. 0 not checked. [2020-07-20 13:26:33,241 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [207329626] [2020-07-20 13:26:33,241 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:26:33,241 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 20] total 22 [2020-07-20 13:26:33,241 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1933979786] [2020-07-20 13:26:33,242 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-20 13:26:33,242 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:26:33,243 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-20 13:26:33,243 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=330, Unknown=0, NotChecked=0, Total=462 [2020-07-20 13:26:33,243 INFO L87 Difference]: Start difference. First operand 190 states and 301 transitions. Second operand 22 states. [2020-07-20 13:26:33,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:26:33,720 INFO L93 Difference]: Finished difference Result 251 states and 384 transitions. [2020-07-20 13:26:33,722 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 13:26:33,722 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 1236 [2020-07-20 13:26:33,724 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:26:33,728 INFO L225 Difference]: With dead ends: 251 [2020-07-20 13:26:33,728 INFO L226 Difference]: Without dead ends: 234 [2020-07-20 13:26:33,733 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2479 GetRequests, 2434 SyntacticMatches, 17 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 215 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=300, Invalid=570, Unknown=0, NotChecked=0, Total=870 [2020-07-20 13:26:33,733 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 234 states. [2020-07-20 13:26:33,758 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 234 to 190. [2020-07-20 13:26:33,758 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 190 states. [2020-07-20 13:26:33,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 301 transitions. [2020-07-20 13:26:33,762 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 301 transitions. Word has length 1236 [2020-07-20 13:26:33,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:26:33,763 INFO L479 AbstractCegarLoop]: Abstraction has 190 states and 301 transitions. [2020-07-20 13:26:33,763 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-20 13:26:33,763 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 301 transitions. [2020-07-20 13:26:33,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1273 [2020-07-20 13:26:33,784 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:26:33,784 INFO L422 BasicCegarLoop]: trace histogram [187, 187, 143, 93, 93, 93, 93, 93, 93, 93, 50, 44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:26:33,997 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:26:33,998 INFO L427 AbstractCegarLoop]: === Iteration 34 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:26:33,998 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:26:33,999 INFO L82 PathProgramCache]: Analyzing trace with hash -1271176744, now seen corresponding path program 23 times [2020-07-20 13:26:33,999 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:26:33,999 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [160461523] [2020-07-20 13:26:34,000 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 13:26:35,004 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:26:35,005 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:26:35,009 INFO L263 TraceCheckSpWp]: Trace formula consists of 2299 conjuncts, 21 conjunts are in the unsatisfiable core [2020-07-20 13:26:35,018 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:26:35,704 INFO L134 CoverageAnalysis]: Checked inductivity of 96829 backedges. 2171 proven. 7061 refuted. 0 times theorem prover too weak. 87597 trivial. 0 not checked. [2020-07-20 13:26:35,704 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:26:42,528 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:45,235 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:46,829 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:46,830 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:47,434 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:47,435 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:47,886 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:48,179 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:48,180 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:48,352 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:48,465 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:48,465 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:48,714 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:49,723 INFO L134 CoverageAnalysis]: Checked inductivity of 96829 backedges. 2169 proven. 7155 refuted. 0 times theorem prover too weak. 87505 trivial. 0 not checked. [2020-07-20 13:26:49,724 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [160461523] [2020-07-20 13:26:49,724 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:26:49,724 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 22] total 24 [2020-07-20 13:26:49,724 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1956331062] [2020-07-20 13:26:49,725 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-20 13:26:49,726 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:26:49,726 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-20 13:26:49,726 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=156, Invalid=396, Unknown=0, NotChecked=0, Total=552 [2020-07-20 13:26:49,726 INFO L87 Difference]: Start difference. First operand 190 states and 301 transitions. Second operand 24 states. [2020-07-20 13:26:50,322 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:26:50,323 INFO L93 Difference]: Finished difference Result 318 states and 500 transitions. [2020-07-20 13:26:50,324 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 13:26:50,324 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 1272 [2020-07-20 13:26:50,326 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:26:50,332 INFO L225 Difference]: With dead ends: 318 [2020-07-20 13:26:50,333 INFO L226 Difference]: Without dead ends: 281 [2020-07-20 13:26:50,338 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2552 GetRequests, 2502 SyntacticMatches, 19 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 269 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=363, Invalid=693, Unknown=0, NotChecked=0, Total=1056 [2020-07-20 13:26:50,339 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 281 states. [2020-07-20 13:26:50,363 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 281 to 169. [2020-07-20 13:26:50,364 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 169 states. [2020-07-20 13:26:50,367 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 265 transitions. [2020-07-20 13:26:50,367 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 265 transitions. Word has length 1272 [2020-07-20 13:26:50,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:26:50,368 INFO L479 AbstractCegarLoop]: Abstraction has 169 states and 265 transitions. [2020-07-20 13:26:50,368 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-20 13:26:50,368 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 265 transitions. [2020-07-20 13:26:50,385 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1249 [2020-07-20 13:26:50,385 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:26:50,386 INFO L422 BasicCegarLoop]: trace histogram [183, 183, 143, 91, 91, 91, 91, 91, 91, 91, 52, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:26:50,600 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:26:50,601 INFO L427 AbstractCegarLoop]: === Iteration 35 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:26:50,601 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:26:50,602 INFO L82 PathProgramCache]: Analyzing trace with hash 1293086348, now seen corresponding path program 24 times [2020-07-20 13:26:50,602 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:26:50,602 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1099679670] [2020-07-20 13:26:50,603 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 13:26:51,644 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:26:51,644 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:26:51,649 INFO L263 TraceCheckSpWp]: Trace formula consists of 2255 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-20 13:26:51,657 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:26:52,263 INFO L134 CoverageAnalysis]: Checked inductivity of 93145 backedges. 2482 proven. 5606 refuted. 0 times theorem prover too weak. 85057 trivial. 0 not checked. [2020-07-20 13:26:52,263 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:26:53,254 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 38 [2020-07-20 13:26:58,651 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:26:58,652 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:00,929 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:00,930 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:01,595 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:01,596 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:02,201 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:02,202 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:02,561 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:02,772 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:02,773 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:02,867 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:02,868 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:02,964 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:03,229 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:04,753 INFO L134 CoverageAnalysis]: Checked inductivity of 93145 backedges. 2489 proven. 5671 refuted. 0 times theorem prover too weak. 84985 trivial. 0 not checked. [2020-07-20 13:27:04,754 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1099679670] [2020-07-20 13:27:04,754 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:27:04,754 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 20] total 22 [2020-07-20 13:27:04,754 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [48861404] [2020-07-20 13:27:04,755 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-20 13:27:04,755 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:27:04,756 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-20 13:27:04,756 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=330, Unknown=0, NotChecked=0, Total=462 [2020-07-20 13:27:04,756 INFO L87 Difference]: Start difference. First operand 169 states and 265 transitions. Second operand 22 states. [2020-07-20 13:27:05,203 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:27:05,203 INFO L93 Difference]: Finished difference Result 297 states and 471 transitions. [2020-07-20 13:27:05,205 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 13:27:05,205 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 1248 [2020-07-20 13:27:05,206 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:27:05,211 INFO L225 Difference]: With dead ends: 297 [2020-07-20 13:27:05,211 INFO L226 Difference]: Without dead ends: 270 [2020-07-20 13:27:05,215 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2503 GetRequests, 2458 SyntacticMatches, 17 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 215 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=300, Invalid=570, Unknown=0, NotChecked=0, Total=870 [2020-07-20 13:27:05,216 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 270 states. [2020-07-20 13:27:05,241 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 270 to 187. [2020-07-20 13:27:05,241 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 187 states. [2020-07-20 13:27:05,244 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 294 transitions. [2020-07-20 13:27:05,244 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 294 transitions. Word has length 1248 [2020-07-20 13:27:05,245 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:27:05,245 INFO L479 AbstractCegarLoop]: Abstraction has 187 states and 294 transitions. [2020-07-20 13:27:05,245 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-20 13:27:05,245 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 294 transitions. [2020-07-20 13:27:05,258 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1237 [2020-07-20 13:27:05,258 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:27:05,259 INFO L422 BasicCegarLoop]: trace histogram [181, 181, 143, 90, 90, 90, 90, 90, 90, 90, 53, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:27:05,459 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:27:05,460 INFO L427 AbstractCegarLoop]: === Iteration 36 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:27:05,460 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:27:05,462 INFO L82 PathProgramCache]: Analyzing trace with hash 93487287, now seen corresponding path program 25 times [2020-07-20 13:27:05,462 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:27:05,462 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1623173155] [2020-07-20 13:27:05,462 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 13:27:06,538 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:27:06,538 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:27:06,544 INFO L263 TraceCheckSpWp]: Trace formula consists of 2234 conjuncts, 21 conjunts are in the unsatisfiable core [2020-07-20 13:27:06,554 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:27:07,233 INFO L134 CoverageAnalysis]: Checked inductivity of 91333 backedges. 1723 proven. 7239 refuted. 0 times theorem prover too weak. 82371 trivial. 0 not checked. [2020-07-20 13:27:07,234 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:27:14,351 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:17,049 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:17,050 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:18,753 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:18,754 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:19,800 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:19,801 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:20,221 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:20,222 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:20,529 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:20,724 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:20,868 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:20,868 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:21,066 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:21,863 INFO L134 CoverageAnalysis]: Checked inductivity of 91333 backedges. 1723 proven. 7331 refuted. 0 times theorem prover too weak. 82279 trivial. 0 not checked. [2020-07-20 13:27:21,864 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1623173155] [2020-07-20 13:27:21,864 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:27:21,864 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 22] total 24 [2020-07-20 13:27:21,865 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1541595190] [2020-07-20 13:27:21,865 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-20 13:27:21,866 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:27:21,866 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-20 13:27:21,866 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=156, Invalid=396, Unknown=0, NotChecked=0, Total=552 [2020-07-20 13:27:21,866 INFO L87 Difference]: Start difference. First operand 187 states and 294 transitions. Second operand 24 states. [2020-07-20 13:27:22,396 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:27:22,396 INFO L93 Difference]: Finished difference Result 247 states and 378 transitions. [2020-07-20 13:27:22,397 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 13:27:22,397 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 1236 [2020-07-20 13:27:22,398 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:27:22,402 INFO L225 Difference]: With dead ends: 247 [2020-07-20 13:27:22,402 INFO L226 Difference]: Without dead ends: 220 [2020-07-20 13:27:22,405 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2480 GetRequests, 2430 SyntacticMatches, 19 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 269 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=363, Invalid=693, Unknown=0, NotChecked=0, Total=1056 [2020-07-20 13:27:22,406 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 220 states. [2020-07-20 13:27:22,428 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 220 to 174. [2020-07-20 13:27:22,428 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 174 states. [2020-07-20 13:27:22,432 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 269 transitions. [2020-07-20 13:27:22,432 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 269 transitions. Word has length 1236 [2020-07-20 13:27:22,432 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:27:22,432 INFO L479 AbstractCegarLoop]: Abstraction has 174 states and 269 transitions. [2020-07-20 13:27:22,433 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-20 13:27:22,433 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 269 transitions. [2020-07-20 13:27:22,449 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1215 [2020-07-20 13:27:22,449 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:27:22,450 INFO L422 BasicCegarLoop]: trace histogram [177, 177, 145, 88, 88, 88, 88, 88, 88, 88, 57, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:27:22,664 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:27:22,665 INFO L427 AbstractCegarLoop]: === Iteration 37 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:27:22,665 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:27:22,666 INFO L82 PathProgramCache]: Analyzing trace with hash 797791953, now seen corresponding path program 26 times [2020-07-20 13:27:22,666 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:27:22,667 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1007447821] [2020-07-20 13:27:22,667 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 13:27:23,772 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:27:23,773 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:27:23,777 INFO L263 TraceCheckSpWp]: Trace formula consists of 2195 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 13:27:23,785 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:27:24,448 INFO L134 CoverageAnalysis]: Checked inductivity of 88056 backedges. 3725 proven. 4749 refuted. 0 times theorem prover too weak. 79582 trivial. 0 not checked. [2020-07-20 13:27:24,448 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:27:31,466 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:31,467 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:32,694 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:32,694 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:33,875 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:33,876 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:34,568 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:34,569 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:34,992 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:35,247 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:35,393 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:35,394 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:35,470 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:35,529 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:35,981 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:38,462 INFO L134 CoverageAnalysis]: Checked inductivity of 88056 backedges. 3739 proven. 4837 refuted. 0 times theorem prover too weak. 79480 trivial. 0 not checked. [2020-07-20 13:27:38,463 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1007447821] [2020-07-20 13:27:38,463 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:27:38,463 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 22 [2020-07-20 13:27:38,463 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1812353775] [2020-07-20 13:27:38,464 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-20 13:27:38,464 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:27:38,464 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-20 13:27:38,464 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=331, Unknown=0, NotChecked=0, Total=462 [2020-07-20 13:27:38,465 INFO L87 Difference]: Start difference. First operand 174 states and 269 transitions. Second operand 22 states. [2020-07-20 13:27:39,047 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:27:39,047 INFO L93 Difference]: Finished difference Result 274 states and 422 transitions. [2020-07-20 13:27:39,050 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 13:27:39,050 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 1214 [2020-07-20 13:27:39,052 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:27:39,060 INFO L225 Difference]: With dead ends: 274 [2020-07-20 13:27:39,061 INFO L226 Difference]: Without dead ends: 262 [2020-07-20 13:27:39,070 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2436 GetRequests, 2388 SyntacticMatches, 19 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 208 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=320, Invalid=610, Unknown=0, NotChecked=0, Total=930 [2020-07-20 13:27:39,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 262 states. [2020-07-20 13:27:39,109 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 262 to 197. [2020-07-20 13:27:39,110 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 197 states. [2020-07-20 13:27:39,114 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 197 states to 197 states and 303 transitions. [2020-07-20 13:27:39,117 INFO L78 Accepts]: Start accepts. Automaton has 197 states and 303 transitions. Word has length 1214 [2020-07-20 13:27:39,118 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:27:39,118 INFO L479 AbstractCegarLoop]: Abstraction has 197 states and 303 transitions. [2020-07-20 13:27:39,118 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-20 13:27:39,118 INFO L276 IsEmpty]: Start isEmpty. Operand 197 states and 303 transitions. [2020-07-20 13:27:39,155 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1250 [2020-07-20 13:27:39,155 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:27:39,156 INFO L422 BasicCegarLoop]: trace histogram [183, 183, 144, 91, 91, 91, 91, 91, 91, 91, 53, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:27:39,370 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:27:39,371 INFO L427 AbstractCegarLoop]: === Iteration 38 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:27:39,371 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:27:39,371 INFO L82 PathProgramCache]: Analyzing trace with hash 2087889354, now seen corresponding path program 27 times [2020-07-20 13:27:39,371 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:27:39,371 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [621736136] [2020-07-20 13:27:39,372 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 13:27:40,531 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:27:40,531 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:27:40,536 INFO L263 TraceCheckSpWp]: Trace formula consists of 2261 conjuncts, 21 conjunts are in the unsatisfiable core [2020-07-20 13:27:40,544 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:27:41,257 INFO L134 CoverageAnalysis]: Checked inductivity of 93288 backedges. 2734 proven. 6327 refuted. 0 times theorem prover too weak. 84227 trivial. 0 not checked. [2020-07-20 13:27:41,258 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:27:49,140 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:52,181 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:52,182 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:53,233 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:53,234 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:54,138 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:54,139 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:54,664 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:55,001 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:55,002 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:55,215 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:55,215 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:55,334 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:55,334 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:55,803 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:27:57,331 INFO L134 CoverageAnalysis]: Checked inductivity of 93288 backedges. 2730 proven. 6423 refuted. 0 times theorem prover too weak. 84135 trivial. 0 not checked. [2020-07-20 13:27:57,331 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [621736136] [2020-07-20 13:27:57,332 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:27:57,332 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 22] total 24 [2020-07-20 13:27:57,332 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [766949410] [2020-07-20 13:27:57,333 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-20 13:27:57,333 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:27:57,333 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-20 13:27:57,333 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=156, Invalid=396, Unknown=0, NotChecked=0, Total=552 [2020-07-20 13:27:57,334 INFO L87 Difference]: Start difference. First operand 197 states and 303 transitions. Second operand 24 states. [2020-07-20 13:27:57,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:27:57,942 INFO L93 Difference]: Finished difference Result 408 states and 634 transitions. [2020-07-20 13:27:57,943 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 13:27:57,943 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 1249 [2020-07-20 13:27:57,944 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:27:57,953 INFO L225 Difference]: With dead ends: 408 [2020-07-20 13:27:57,953 INFO L226 Difference]: Without dead ends: 381 [2020-07-20 13:27:57,961 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2506 GetRequests, 2456 SyntacticMatches, 19 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 269 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=363, Invalid=693, Unknown=0, NotChecked=0, Total=1056 [2020-07-20 13:27:57,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 381 states. [2020-07-20 13:27:57,991 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 381 to 166. [2020-07-20 13:27:57,991 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 166 states. [2020-07-20 13:27:57,994 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 251 transitions. [2020-07-20 13:27:57,994 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 251 transitions. Word has length 1249 [2020-07-20 13:27:57,995 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:27:57,995 INFO L479 AbstractCegarLoop]: Abstraction has 166 states and 251 transitions. [2020-07-20 13:27:57,995 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-20 13:27:57,995 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 251 transitions. [2020-07-20 13:27:58,010 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1214 [2020-07-20 13:27:58,010 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:27:58,011 INFO L422 BasicCegarLoop]: trace histogram [177, 177, 144, 88, 88, 88, 88, 88, 88, 88, 56, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:27:58,226 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:27:58,227 INFO L427 AbstractCegarLoop]: === Iteration 39 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:27:58,227 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:27:58,227 INFO L82 PathProgramCache]: Analyzing trace with hash 493369557, now seen corresponding path program 28 times [2020-07-20 13:27:58,227 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:27:58,228 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [658708242] [2020-07-20 13:27:58,228 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 13:27:59,539 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:27:59,540 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:27:59,545 INFO L263 TraceCheckSpWp]: Trace formula consists of 2694 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 13:27:59,553 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:28:00,158 INFO L134 CoverageAnalysis]: Checked inductivity of 87912 backedges. 5851 proven. 2614 refuted. 0 times theorem prover too weak. 79447 trivial. 0 not checked. [2020-07-20 13:28:00,158 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:28:04,958 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:04,959 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:07,034 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:07,035 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:08,390 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:08,391 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:09,164 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:09,165 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:09,638 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:09,639 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:09,930 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:09,931 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:10,096 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:10,096 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:10,180 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:10,235 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:11,092 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:15,740 INFO L134 CoverageAnalysis]: Checked inductivity of 87912 backedges. 5863 proven. 2704 refuted. 0 times theorem prover too weak. 79345 trivial. 0 not checked. [2020-07-20 13:28:15,740 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [658708242] [2020-07-20 13:28:15,740 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:28:15,741 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 22 [2020-07-20 13:28:15,741 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2008220333] [2020-07-20 13:28:15,741 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-20 13:28:15,742 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:28:15,742 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-20 13:28:15,742 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=331, Unknown=0, NotChecked=0, Total=462 [2020-07-20 13:28:15,742 INFO L87 Difference]: Start difference. First operand 166 states and 251 transitions. Second operand 22 states. [2020-07-20 13:28:16,334 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:28:16,335 INFO L93 Difference]: Finished difference Result 271 states and 412 transitions. [2020-07-20 13:28:16,335 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 13:28:16,335 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 1213 [2020-07-20 13:28:16,336 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:28:16,341 INFO L225 Difference]: With dead ends: 271 [2020-07-20 13:28:16,341 INFO L226 Difference]: Without dead ends: 264 [2020-07-20 13:28:16,344 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2434 GetRequests, 2386 SyntacticMatches, 19 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 208 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=320, Invalid=610, Unknown=0, NotChecked=0, Total=930 [2020-07-20 13:28:16,345 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 264 states. [2020-07-20 13:28:16,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 264 to 171. [2020-07-20 13:28:16,367 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 171 states. [2020-07-20 13:28:16,370 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 257 transitions. [2020-07-20 13:28:16,371 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 257 transitions. Word has length 1213 [2020-07-20 13:28:16,371 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:28:16,371 INFO L479 AbstractCegarLoop]: Abstraction has 171 states and 257 transitions. [2020-07-20 13:28:16,372 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-20 13:28:16,372 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 257 transitions. [2020-07-20 13:28:16,386 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1237 [2020-07-20 13:28:16,387 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:28:16,387 INFO L422 BasicCegarLoop]: trace histogram [181, 181, 143, 90, 90, 90, 90, 90, 90, 90, 53, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:28:16,588 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:28:16,588 INFO L427 AbstractCegarLoop]: === Iteration 40 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:28:16,588 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:28:16,589 INFO L82 PathProgramCache]: Analyzing trace with hash -1429871315, now seen corresponding path program 29 times [2020-07-20 13:28:16,590 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:28:16,590 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1361413935] [2020-07-20 13:28:16,590 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 13:28:17,882 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:28:17,882 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:28:17,888 INFO L263 TraceCheckSpWp]: Trace formula consists of 2234 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-20 13:28:17,896 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:28:18,536 INFO L134 CoverageAnalysis]: Checked inductivity of 91333 backedges. 3540 proven. 4468 refuted. 0 times theorem prover too weak. 83325 trivial. 0 not checked. [2020-07-20 13:28:18,536 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:28:21,008 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 13:28:26,453 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:26,453 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:27,717 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:27,718 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:28,969 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:28,970 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:29,709 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:29,710 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:30,151 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:30,415 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:30,416 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:30,538 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:30,539 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:30,667 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:31,220 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:34,077 INFO L134 CoverageAnalysis]: Checked inductivity of 91333 backedges. 3545 proven. 4535 refuted. 0 times theorem prover too weak. 83253 trivial. 0 not checked. [2020-07-20 13:28:34,078 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1361413935] [2020-07-20 13:28:34,078 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:28:34,078 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 20] total 22 [2020-07-20 13:28:34,078 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [669855428] [2020-07-20 13:28:34,079 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-20 13:28:34,079 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:28:34,079 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-20 13:28:34,079 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=330, Unknown=0, NotChecked=0, Total=462 [2020-07-20 13:28:34,079 INFO L87 Difference]: Start difference. First operand 171 states and 257 transitions. Second operand 22 states. [2020-07-20 13:28:34,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:28:34,693 INFO L93 Difference]: Finished difference Result 327 states and 495 transitions. [2020-07-20 13:28:34,696 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 13:28:34,696 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 1236 [2020-07-20 13:28:34,697 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:28:34,705 INFO L225 Difference]: With dead ends: 327 [2020-07-20 13:28:34,705 INFO L226 Difference]: Without dead ends: 310 [2020-07-20 13:28:34,712 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2479 GetRequests, 2434 SyntacticMatches, 17 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 215 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=300, Invalid=570, Unknown=0, NotChecked=0, Total=870 [2020-07-20 13:28:34,712 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 310 states. [2020-07-20 13:28:34,739 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 310 to 217. [2020-07-20 13:28:34,740 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 217 states. [2020-07-20 13:28:34,744 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 217 states to 217 states and 325 transitions. [2020-07-20 13:28:34,745 INFO L78 Accepts]: Start accepts. Automaton has 217 states and 325 transitions. Word has length 1236 [2020-07-20 13:28:34,745 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:28:34,745 INFO L479 AbstractCegarLoop]: Abstraction has 217 states and 325 transitions. [2020-07-20 13:28:34,745 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-20 13:28:34,745 INFO L276 IsEmpty]: Start isEmpty. Operand 217 states and 325 transitions. [2020-07-20 13:28:34,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1225 [2020-07-20 13:28:34,763 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:28:34,764 INFO L422 BasicCegarLoop]: trace histogram [179, 179, 143, 89, 89, 89, 89, 89, 89, 89, 54, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:28:34,978 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:28:34,979 INFO L427 AbstractCegarLoop]: === Iteration 41 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:28:34,979 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:28:34,979 INFO L82 PathProgramCache]: Analyzing trace with hash -1018676894, now seen corresponding path program 30 times [2020-07-20 13:28:34,979 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:28:34,980 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [246460558] [2020-07-20 13:28:34,980 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 13:28:36,275 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:28:36,276 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:28:36,282 INFO L263 TraceCheckSpWp]: Trace formula consists of 2719 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-20 13:28:36,290 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:28:37,008 INFO L134 CoverageAnalysis]: Checked inductivity of 89541 backedges. 5501 proven. 2427 refuted. 0 times theorem prover too weak. 81613 trivial. 0 not checked. [2020-07-20 13:28:37,008 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:28:41,988 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:41,989 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:44,141 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:45,471 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:46,202 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:46,202 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:46,659 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:46,659 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:46,916 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:46,917 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:47,039 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:47,168 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:48,119 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:28:53,337 INFO L134 CoverageAnalysis]: Checked inductivity of 89541 backedges. 5504 proven. 2496 refuted. 0 times theorem prover too weak. 81541 trivial. 0 not checked. [2020-07-20 13:28:53,338 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [246460558] [2020-07-20 13:28:53,338 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:28:53,338 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 20] total 22 [2020-07-20 13:28:53,339 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1493944464] [2020-07-20 13:28:53,339 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-20 13:28:53,339 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:28:53,340 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-20 13:28:53,340 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=330, Unknown=0, NotChecked=0, Total=462 [2020-07-20 13:28:53,340 INFO L87 Difference]: Start difference. First operand 217 states and 325 transitions. Second operand 22 states. [2020-07-20 13:28:54,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:28:54,003 INFO L93 Difference]: Finished difference Result 360 states and 542 transitions. [2020-07-20 13:28:54,003 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 13:28:54,003 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 1224 [2020-07-20 13:28:54,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:28:54,012 INFO L225 Difference]: With dead ends: 360 [2020-07-20 13:28:54,012 INFO L226 Difference]: Without dead ends: 353 [2020-07-20 13:28:54,017 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2455 GetRequests, 2410 SyntacticMatches, 17 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 215 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=300, Invalid=570, Unknown=0, NotChecked=0, Total=870 [2020-07-20 13:28:54,018 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 353 states. [2020-07-20 13:28:54,046 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 353 to 199. [2020-07-20 13:28:54,046 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 199 states. [2020-07-20 13:28:54,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 199 states to 199 states and 297 transitions. [2020-07-20 13:28:54,049 INFO L78 Accepts]: Start accepts. Automaton has 199 states and 297 transitions. Word has length 1224 [2020-07-20 13:28:54,050 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:28:54,050 INFO L479 AbstractCegarLoop]: Abstraction has 199 states and 297 transitions. [2020-07-20 13:28:54,050 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-20 13:28:54,050 INFO L276 IsEmpty]: Start isEmpty. Operand 199 states and 297 transitions. [2020-07-20 13:28:54,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1225 [2020-07-20 13:28:54,061 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:28:54,062 INFO L422 BasicCegarLoop]: trace histogram [179, 179, 143, 89, 89, 89, 89, 89, 89, 89, 54, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:28:54,262 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:28:54,263 INFO L427 AbstractCegarLoop]: === Iteration 42 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:28:54,263 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:28:54,264 INFO L82 PathProgramCache]: Analyzing trace with hash -1313694558, now seen corresponding path program 31 times [2020-07-20 13:28:54,265 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:28:54,265 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [948711438] [2020-07-20 13:28:54,265 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 13:28:55,540 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:28:55,540 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:28:55,546 INFO L263 TraceCheckSpWp]: Trace formula consists of 2212 conjuncts, 21 conjunts are in the unsatisfiable core [2020-07-20 13:28:55,554 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:28:56,325 INFO L134 CoverageAnalysis]: Checked inductivity of 89541 backedges. 3931 proven. 4941 refuted. 0 times theorem prover too weak. 80669 trivial. 0 not checked. [2020-07-20 13:28:56,325 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:28:59,781 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 54 DAG size of output: 53 [2020-07-20 13:29:05,765 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:05,766 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:07,537 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:07,538 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:09,241 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:09,242 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:10,335 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:10,336 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:10,992 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:11,400 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:11,401 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:11,653 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:11,653 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:11,802 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:12,559 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:15,737 INFO L134 CoverageAnalysis]: Checked inductivity of 89541 backedges. 3925 proven. 5039 refuted. 0 times theorem prover too weak. 80577 trivial. 0 not checked. [2020-07-20 13:29:15,738 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [948711438] [2020-07-20 13:29:15,738 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:29:15,738 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 22] total 24 [2020-07-20 13:29:15,739 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1750129475] [2020-07-20 13:29:15,739 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-20 13:29:15,739 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:29:15,739 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-20 13:29:15,740 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=156, Invalid=396, Unknown=0, NotChecked=0, Total=552 [2020-07-20 13:29:15,740 INFO L87 Difference]: Start difference. First operand 199 states and 297 transitions. Second operand 24 states. [2020-07-20 13:29:16,593 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:29:16,593 INFO L93 Difference]: Finished difference Result 463 states and 710 transitions. [2020-07-20 13:29:16,596 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 13:29:16,596 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 1224 [2020-07-20 13:29:16,597 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:29:16,608 INFO L225 Difference]: With dead ends: 463 [2020-07-20 13:29:16,608 INFO L226 Difference]: Without dead ends: 446 [2020-07-20 13:29:16,616 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2456 GetRequests, 2406 SyntacticMatches, 19 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 269 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=363, Invalid=693, Unknown=0, NotChecked=0, Total=1056 [2020-07-20 13:29:16,616 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 446 states. [2020-07-20 13:29:16,652 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 446 to 204. [2020-07-20 13:29:16,652 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 204 states. [2020-07-20 13:29:16,657 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 301 transitions. [2020-07-20 13:29:16,657 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 301 transitions. Word has length 1224 [2020-07-20 13:29:16,658 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:29:16,658 INFO L479 AbstractCegarLoop]: Abstraction has 204 states and 301 transitions. [2020-07-20 13:29:16,658 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-20 13:29:16,658 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 301 transitions. [2020-07-20 13:29:16,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1225 [2020-07-20 13:29:16,676 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:29:16,677 INFO L422 BasicCegarLoop]: trace histogram [179, 179, 143, 89, 89, 89, 89, 89, 89, 89, 54, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:29:16,882 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:29:16,883 INFO L427 AbstractCegarLoop]: === Iteration 43 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:29:16,883 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:29:16,884 INFO L82 PathProgramCache]: Analyzing trace with hash -1991897758, now seen corresponding path program 32 times [2020-07-20 13:29:16,884 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:29:16,885 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1721137905] [2020-07-20 13:29:16,885 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 13:29:18,249 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:29:18,249 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:29:18,256 INFO L263 TraceCheckSpWp]: Trace formula consists of 2719 conjuncts, 21 conjunts are in the unsatisfiable core [2020-07-20 13:29:18,265 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:29:19,066 INFO L134 CoverageAnalysis]: Checked inductivity of 89541 backedges. 6141 proven. 2731 refuted. 0 times theorem prover too weak. 80669 trivial. 0 not checked. [2020-07-20 13:29:19,067 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:29:25,264 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 50 [2020-07-20 13:29:25,500 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:28,305 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:28,306 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:30,152 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:31,319 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:32,014 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:32,014 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:32,477 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:32,477 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:32,748 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:32,915 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:34,127 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:39,872 INFO L134 CoverageAnalysis]: Checked inductivity of 89541 backedges. 6133 proven. 2831 refuted. 0 times theorem prover too weak. 80577 trivial. 0 not checked. [2020-07-20 13:29:39,873 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1721137905] [2020-07-20 13:29:39,873 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:29:39,873 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 22] total 24 [2020-07-20 13:29:39,874 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [99569836] [2020-07-20 13:29:39,874 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-20 13:29:39,874 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:29:39,874 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-20 13:29:39,875 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=156, Invalid=396, Unknown=0, NotChecked=0, Total=552 [2020-07-20 13:29:39,875 INFO L87 Difference]: Start difference. First operand 204 states and 301 transitions. Second operand 24 states. [2020-07-20 13:29:40,861 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:29:40,861 INFO L93 Difference]: Finished difference Result 565 states and 863 transitions. [2020-07-20 13:29:40,863 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 13:29:40,864 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 1224 [2020-07-20 13:29:40,865 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:29:40,880 INFO L225 Difference]: With dead ends: 565 [2020-07-20 13:29:40,880 INFO L226 Difference]: Without dead ends: 467 [2020-07-20 13:29:40,893 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2456 GetRequests, 2406 SyntacticMatches, 19 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 269 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=363, Invalid=693, Unknown=0, NotChecked=0, Total=1056 [2020-07-20 13:29:40,894 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 467 states. [2020-07-20 13:29:40,923 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 467 to 111. [2020-07-20 13:29:40,923 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 111 states. [2020-07-20 13:29:40,925 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 161 transitions. [2020-07-20 13:29:40,925 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 161 transitions. Word has length 1224 [2020-07-20 13:29:40,926 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:29:40,926 INFO L479 AbstractCegarLoop]: Abstraction has 111 states and 161 transitions. [2020-07-20 13:29:40,926 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-20 13:29:40,926 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 161 transitions. [2020-07-20 13:29:40,940 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1214 [2020-07-20 13:29:40,940 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:29:40,941 INFO L422 BasicCegarLoop]: trace histogram [177, 177, 144, 88, 88, 88, 88, 88, 88, 88, 56, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:29:41,155 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:29:41,156 INFO L427 AbstractCegarLoop]: === Iteration 44 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:29:41,156 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:29:41,157 INFO L82 PathProgramCache]: Analyzing trace with hash -666509037, now seen corresponding path program 33 times [2020-07-20 13:29:41,158 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:29:41,158 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1821879771] [2020-07-20 13:29:41,158 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 13:29:42,600 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:29:42,600 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:29:42,606 INFO L263 TraceCheckSpWp]: Trace formula consists of 2195 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 13:29:42,614 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:29:43,323 INFO L134 CoverageAnalysis]: Checked inductivity of 87912 backedges. 1350 proven. 8042 refuted. 0 times theorem prover too weak. 78520 trivial. 0 not checked. [2020-07-20 13:29:43,324 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:29:53,937 WARN L193 SmtUtils]: Spent 175.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-20 13:29:54,546 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:54,546 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:29:58,627 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:01,363 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:03,210 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:04,313 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:05,043 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:05,043 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:05,462 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:05,691 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:05,692 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:05,811 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:05,811 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:05,890 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:06,618 INFO L134 CoverageAnalysis]: Checked inductivity of 87912 backedges. 1366 proven. 8152 refuted. 0 times theorem prover too weak. 78394 trivial. 0 not checked. [2020-07-20 13:30:06,619 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1821879771] [2020-07-20 13:30:06,619 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:30:06,619 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 24 [2020-07-20 13:30:06,620 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [879647053] [2020-07-20 13:30:06,620 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-20 13:30:06,620 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:30:06,620 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-20 13:30:06,621 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=397, Unknown=0, NotChecked=0, Total=552 [2020-07-20 13:30:06,621 INFO L87 Difference]: Start difference. First operand 111 states and 161 transitions. Second operand 24 states. [2020-07-20 13:30:07,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:30:07,689 INFO L93 Difference]: Finished difference Result 324 states and 482 transitions. [2020-07-20 13:30:07,692 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 13:30:07,692 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 1213 [2020-07-20 13:30:07,693 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:30:07,699 INFO L225 Difference]: With dead ends: 324 [2020-07-20 13:30:07,699 INFO L226 Difference]: Without dead ends: 108 [2020-07-20 13:30:07,705 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2435 GetRequests, 2382 SyntacticMatches, 21 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 261 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=385, Invalid=737, Unknown=0, NotChecked=0, Total=1122 [2020-07-20 13:30:07,705 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-07-20 13:30:07,713 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 108. [2020-07-20 13:30:07,714 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 108 states. [2020-07-20 13:30:07,714 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 132 transitions. [2020-07-20 13:30:07,715 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 132 transitions. Word has length 1213 [2020-07-20 13:30:07,715 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:30:07,715 INFO L479 AbstractCegarLoop]: Abstraction has 108 states and 132 transitions. [2020-07-20 13:30:07,715 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-20 13:30:07,715 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 132 transitions. [2020-07-20 13:30:07,728 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1225 [2020-07-20 13:30:07,729 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:30:07,729 INFO L422 BasicCegarLoop]: trace histogram [179, 179, 143, 89, 89, 89, 89, 89, 89, 89, 54, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:30:07,942 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:30:07,942 INFO L427 AbstractCegarLoop]: === Iteration 45 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:30:07,943 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:30:07,943 INFO L82 PathProgramCache]: Analyzing trace with hash 221687074, now seen corresponding path program 34 times [2020-07-20 13:30:07,944 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:30:07,944 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1937373773] [2020-07-20 13:30:07,944 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 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 13:30:09,369 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:30:09,370 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:30:09,375 INFO L263 TraceCheckSpWp]: Trace formula consists of 2212 conjuncts, 21 conjunts are in the unsatisfiable core [2020-07-20 13:30:09,384 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:30:10,223 INFO L134 CoverageAnalysis]: Checked inductivity of 89541 backedges. 1425 proven. 7447 refuted. 0 times theorem prover too weak. 80669 trivial. 0 not checked. [2020-07-20 13:30:10,223 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:30:13,828 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2020-07-20 13:30:13,931 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2020-07-20 13:30:14,268 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 54 DAG size of output: 53 [2020-07-20 13:30:21,231 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 41 DAG size of output: 40 [2020-07-20 13:30:21,318 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:21,318 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:25,638 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 41 DAG size of output: 40 [2020-07-20 13:30:25,725 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:25,726 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:28,663 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:28,664 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:30,476 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:30,477 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:31,493 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:32,134 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:32,543 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:32,812 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:32,813 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:33,008 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:33,668 INFO L134 CoverageAnalysis]: Checked inductivity of 89541 backedges. 1431 proven. 7533 refuted. 0 times theorem prover too weak. 80577 trivial. 0 not checked. [2020-07-20 13:30:33,669 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1937373773] [2020-07-20 13:30:33,669 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:30:33,670 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 22] total 24 [2020-07-20 13:30:33,670 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1804367646] [2020-07-20 13:30:33,670 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-20 13:30:33,670 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:30:33,670 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-20 13:30:33,671 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=156, Invalid=396, Unknown=0, NotChecked=0, Total=552 [2020-07-20 13:30:33,671 INFO L87 Difference]: Start difference. First operand 108 states and 132 transitions. Second operand 24 states. [2020-07-20 13:30:34,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:30:34,574 INFO L93 Difference]: Finished difference Result 150 states and 180 transitions. [2020-07-20 13:30:34,577 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 13:30:34,578 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 1224 [2020-07-20 13:30:34,579 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:30:34,581 INFO L225 Difference]: With dead ends: 150 [2020-07-20 13:30:34,581 INFO L226 Difference]: Without dead ends: 103 [2020-07-20 13:30:34,583 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2456 GetRequests, 2406 SyntacticMatches, 19 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 269 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=363, Invalid=693, Unknown=0, NotChecked=0, Total=1056 [2020-07-20 13:30:34,583 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2020-07-20 13:30:34,591 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2020-07-20 13:30:34,591 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-07-20 13:30:34,592 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 121 transitions. [2020-07-20 13:30:34,592 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 121 transitions. Word has length 1224 [2020-07-20 13:30:34,592 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:30:34,592 INFO L479 AbstractCegarLoop]: Abstraction has 103 states and 121 transitions. [2020-07-20 13:30:34,592 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-20 13:30:34,593 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 121 transitions. [2020-07-20 13:30:34,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1225 [2020-07-20 13:30:34,602 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:30:34,603 INFO L422 BasicCegarLoop]: trace histogram [179, 179, 143, 89, 89, 89, 89, 89, 89, 89, 54, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:30:34,803 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:30:34,804 INFO L427 AbstractCegarLoop]: === Iteration 46 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:30:34,805 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:30:34,805 INFO L82 PathProgramCache]: Analyzing trace with hash -69238494, now seen corresponding path program 35 times [2020-07-20 13:30:34,806 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:30:34,806 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1213512502] [2020-07-20 13:30:34,807 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 13:30:36,267 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:30:36,267 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:30:36,273 INFO L263 TraceCheckSpWp]: Trace formula consists of 2212 conjuncts, 23 conjunts are in the unsatisfiable core [2020-07-20 13:30:36,282 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:30:37,227 INFO L134 CoverageAnalysis]: Checked inductivity of 89541 backedges. 1438 proven. 8365 refuted. 0 times theorem prover too weak. 79738 trivial. 0 not checked. [2020-07-20 13:30:37,228 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:30:40,279 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 13:30:40,386 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 13:30:40,501 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2020-07-20 13:30:40,616 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2020-07-20 13:30:41,673 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 13:30:41,799 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 13:30:41,922 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-07-20 13:30:42,039 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2020-07-20 13:30:42,147 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2020-07-20 13:30:50,582 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 13:30:50,685 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 13:30:50,794 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2020-07-20 13:30:50,901 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2020-07-20 13:30:51,013 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 13:30:51,738 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:51,738 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:56,561 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 13:30:56,665 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 13:30:57,015 WARN L193 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 47 [2020-07-20 13:30:57,250 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:30:57,251 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:31:00,931 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:31:03,314 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:31:03,315 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:31:04,859 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:31:05,776 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:31:05,776 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:31:06,347 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:31:06,348 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:31:06,715 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:31:06,716 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:31:06,923 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:31:07,773 INFO L134 CoverageAnalysis]: Checked inductivity of 89541 backedges. 1429 proven. 8491 refuted. 0 times theorem prover too weak. 79621 trivial. 0 not checked. [2020-07-20 13:31:07,774 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1213512502] [2020-07-20 13:31:07,774 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:31:07,775 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 24] total 26 [2020-07-20 13:31:07,775 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [852023329] [2020-07-20 13:31:07,775 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-07-20 13:31:07,775 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:31:07,776 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-07-20 13:31:07,776 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=182, Invalid=468, Unknown=0, NotChecked=0, Total=650 [2020-07-20 13:31:07,776 INFO L87 Difference]: Start difference. First operand 103 states and 121 transitions. Second operand 26 states. [2020-07-20 13:31:09,141 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:31:09,141 INFO L93 Difference]: Finished difference Result 267 states and 320 transitions. [2020-07-20 13:31:09,149 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 13:31:09,150 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 1224 [2020-07-20 13:31:09,151 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:31:09,154 INFO L225 Difference]: With dead ends: 267 [2020-07-20 13:31:09,154 INFO L226 Difference]: Without dead ends: 0 [2020-07-20 13:31:09,163 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2457 GetRequests, 2402 SyntacticMatches, 21 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 329 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=432, Invalid=828, Unknown=0, NotChecked=0, Total=1260 [2020-07-20 13:31:09,164 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-20 13:31:09,164 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-20 13:31:09,164 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-20 13:31:09,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-20 13:31:09,165 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 1224 [2020-07-20 13:31:09,165 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:31:09,165 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-20 13:31:09,165 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-07-20 13:31:09,165 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-20 13:31:09,165 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-20 13:31:09,378 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:31:09,383 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-20 13:31:10,271 WARN L193 SmtUtils]: Spent 798.00 ms on a formula simplification. DAG size of input: 288 DAG size of output: 72 [2020-07-20 13:31:11,449 WARN L193 SmtUtils]: Spent 1.17 s on a formula simplification. DAG size of input: 396 DAG size of output: 107 [2020-07-20 13:31:30,067 WARN L193 SmtUtils]: Spent 18.61 s on a formula simplification. DAG size of input: 991 DAG size of output: 457 [2020-07-20 13:31:30,322 WARN L193 SmtUtils]: Spent 251.00 ms on a formula simplification. DAG size of input: 288 DAG size of output: 72 [2020-07-20 13:31:30,919 WARN L193 SmtUtils]: Spent 594.00 ms on a formula simplification. DAG size of input: 396 DAG size of output: 107 [2020-07-20 13:31:39,696 WARN L193 SmtUtils]: Spent 8.77 s on a formula simplification. DAG size of input: 864 DAG size of output: 365 [2020-07-20 13:31:48,498 WARN L193 SmtUtils]: Spent 8.80 s on a formula simplification. DAG size of input: 864 DAG size of output: 365 [2020-07-20 13:31:48,749 WARN L193 SmtUtils]: Spent 247.00 ms on a formula simplification. DAG size of input: 288 DAG size of output: 72 [2020-07-20 13:31:49,004 WARN L193 SmtUtils]: Spent 252.00 ms on a formula simplification. DAG size of input: 288 DAG size of output: 72 [2020-07-20 13:32:06,031 WARN L193 SmtUtils]: Spent 17.02 s on a formula simplification. DAG size of input: 991 DAG size of output: 457 [2020-07-20 13:32:06,293 WARN L193 SmtUtils]: Spent 256.00 ms on a formula simplification. DAG size of input: 288 DAG size of output: 72 [2020-07-20 13:32:06,890 WARN L193 SmtUtils]: Spent 594.00 ms on a formula simplification. DAG size of input: 396 DAG size of output: 107 [2020-07-20 13:32:23,641 WARN L193 SmtUtils]: Spent 16.75 s on a formula simplification. DAG size of input: 986 DAG size of output: 457 [2020-07-20 13:32:36,235 WARN L193 SmtUtils]: Spent 12.59 s on a formula simplification. DAG size of input: 935 DAG size of output: 414 [2020-07-20 13:32:36,840 WARN L193 SmtUtils]: Spent 600.00 ms on a formula simplification. DAG size of input: 396 DAG size of output: 107 [2020-07-20 13:32:53,894 WARN L193 SmtUtils]: Spent 17.05 s on a formula simplification. DAG size of input: 991 DAG size of output: 457 [2020-07-20 13:33:06,671 WARN L193 SmtUtils]: Spent 12.77 s on a formula simplification. DAG size of input: 941 DAG size of output: 418 [2020-07-20 13:33:07,258 WARN L193 SmtUtils]: Spent 583.00 ms on a formula simplification. DAG size of input: 396 DAG size of output: 107 [2020-07-20 13:33:23,870 WARN L193 SmtUtils]: Spent 16.61 s on a formula simplification. DAG size of input: 991 DAG size of output: 457 [2020-07-20 13:33:24,137 WARN L193 SmtUtils]: Spent 262.00 ms on a formula simplification. DAG size of input: 288 DAG size of output: 72 [2020-07-20 13:33:24,737 WARN L193 SmtUtils]: Spent 596.00 ms on a formula simplification. DAG size of input: 396 DAG size of output: 107 [2020-07-20 13:33:24,988 WARN L193 SmtUtils]: Spent 248.00 ms on a formula simplification. DAG size of input: 288 DAG size of output: 72 [2020-07-20 13:33:25,583 WARN L193 SmtUtils]: Spent 592.00 ms on a formula simplification. DAG size of input: 396 DAG size of output: 107 [2020-07-20 13:33:25,837 WARN L193 SmtUtils]: Spent 250.00 ms on a formula simplification. DAG size of input: 288 DAG size of output: 72 [2020-07-20 13:33:26,471 WARN L193 SmtUtils]: Spent 630.00 ms on a formula simplification. DAG size of input: 396 DAG size of output: 107 [2020-07-20 13:33:43,017 WARN L193 SmtUtils]: Spent 16.54 s on a formula simplification. DAG size of input: 986 DAG size of output: 457 [2020-07-20 13:33:44,184 WARN L193 SmtUtils]: Spent 1.16 s on a formula simplification. DAG size of input: 491 DAG size of output: 150 [2020-07-20 13:33:44,761 WARN L193 SmtUtils]: Spent 573.00 ms on a formula simplification. DAG size of input: 396 DAG size of output: 107 [2020-07-20 13:34:01,363 WARN L193 SmtUtils]: Spent 16.60 s on a formula simplification. DAG size of input: 991 DAG size of output: 457 [2020-07-20 13:34:01,607 WARN L193 SmtUtils]: Spent 239.00 ms on a formula simplification. DAG size of input: 288 DAG size of output: 72