/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 DAGSIZE --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_25-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 19:30:11,493 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 19:30:11,496 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 19:30:11,509 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 19:30:11,509 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 19:30:11,510 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 19:30:11,512 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 19:30:11,514 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 19:30:11,515 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 19:30:11,516 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 19:30:11,517 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 19:30:11,519 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 19:30:11,519 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 19:30:11,520 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 19:30:11,522 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 19:30:11,523 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 19:30:11,524 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 19:30:11,525 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 19:30:11,527 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 19:30:11,529 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 19:30:11,531 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 19:30:11,532 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 19:30:11,533 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 19:30:11,534 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 19:30:11,537 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 19:30:11,545 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 19:30:11,546 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 19:30:11,547 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 19:30:11,548 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 19:30:11,570 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 19:30:11,570 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 19:30:11,571 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 19:30:11,571 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 19:30:11,572 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 19:30:11,572 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 19:30:11,572 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 19:30:11,574 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 19:30:11,574 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 19:30:11,574 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 19:30:11,575 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 19:30:11,576 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 19:30:11,576 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 19:30:11,576 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 19:30:11,576 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 19:30:11,577 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 19:30:11,577 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 19:30:11,577 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 19:30:11,578 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 19:30:11,578 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 19:30:11,578 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 19:30:11,578 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 19:30:11,579 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 19:30:11,579 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 19:30:11,579 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 19:30:11,579 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 19:30:11,579 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:11,580 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 19:30:11,580 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 19:30:11,580 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 -> DAGSIZE Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 2 [2020-07-21 19:30:11,880 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 19:30:11,894 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 19:30:11,898 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 19:30:11,899 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 19:30:11,900 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 19:30:11,900 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_25-2.c [2020-07-21 19:30:11,968 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/978e9d26a/cc083723cce04bb793a23c3d7dbd3662/FLAG261f5a9af [2020-07-21 19:30:12,459 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 19:30:12,460 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_25-2.c [2020-07-21 19:30:12,468 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/978e9d26a/cc083723cce04bb793a23c3d7dbd3662/FLAG261f5a9af [2020-07-21 19:30:12,866 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/978e9d26a/cc083723cce04bb793a23c3d7dbd3662 [2020-07-21 19:30:12,877 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 19:30:12,880 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 19:30:12,881 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 19:30:12,881 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 19:30:12,885 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 19:30:12,887 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 07:30:12" (1/1) ... [2020-07-21 19:30:12,890 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@32efa0d3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:30:12, skipping insertion in model container [2020-07-21 19:30:12,890 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 07:30:12" (1/1) ... [2020-07-21 19:30:12,899 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 19:30:12,919 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 19:30:13,109 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 19:30:13,113 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 19:30:13,127 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 19:30:13,141 INFO L208 MainTranslator]: Completed translation [2020-07-21 19:30:13,142 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:30:13 WrapperNode [2020-07-21 19:30:13,142 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 19:30:13,143 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 19:30:13,143 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 19:30:13,143 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 19:30:13,157 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:30:13" (1/1) ... [2020-07-21 19:30:13,158 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:30:13" (1/1) ... [2020-07-21 19:30:13,163 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:30:13" (1/1) ... [2020-07-21 19:30:13,163 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:30:13" (1/1) ... [2020-07-21 19:30:13,166 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:30:13" (1/1) ... [2020-07-21 19:30:13,168 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:30:13" (1/1) ... [2020-07-21 19:30:13,169 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:30:13" (1/1) ... [2020-07-21 19:30:13,170 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 19:30:13,171 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 19:30:13,171 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 19:30:13,171 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 19:30:13,172 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:30:13" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 19:30:13,325 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 19:30:13,326 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 19:30:13,326 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo [2020-07-21 19:30:13,326 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 19:30:13,326 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 19:30:13,326 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 19:30:13,326 INFO L130 BoogieDeclarations]: Found specification of procedure fibo [2020-07-21 19:30:13,327 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 19:30:13,327 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 19:30:13,327 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 19:30:13,508 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 19:30:13,508 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 19:30:13,512 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 07:30:13 BoogieIcfgContainer [2020-07-21 19:30:13,512 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 19:30:13,514 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 19:30:13,514 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 19:30:13,517 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 19:30:13,517 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 07:30:12" (1/3) ... [2020-07-21 19:30:13,519 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@570ebe47 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 07:30:13, skipping insertion in model container [2020-07-21 19:30:13,519 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:30:13" (2/3) ... [2020-07-21 19:30:13,519 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@570ebe47 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 07:30:13, skipping insertion in model container [2020-07-21 19:30:13,519 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 07:30:13" (3/3) ... [2020-07-21 19:30:13,521 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_25-2.c [2020-07-21 19:30:13,533 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 19:30:13,542 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 19:30:13,558 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 19:30:13,627 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 19:30:13,627 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 19:30:13,629 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 19:30:13,629 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 19:30:13,630 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 19:30:13,630 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 19:30:13,630 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 19:30:13,630 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 19:30:13,663 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2020-07-21 19:30:13,669 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 19:30:13,670 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:30:13,671 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:30:13,671 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:30:13,678 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:30:13,678 INFO L82 PathProgramCache]: Analyzing trace with hash 537028541, now seen corresponding path program 1 times [2020-07-21 19:30:13,689 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:30:13,690 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1189667680] [2020-07-21 19:30:13,691 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:13,746 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:30:13,747 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:30:13,750 INFO L263 TraceCheckSpWp]: Trace formula consists of 20 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 19:30:13,755 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:30:13,846 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 19:30:13,847 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:30:13,848 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1189667680] [2020-07-21 19:30:13,848 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:30:13,849 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 19:30:13,850 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [79907350] [2020-07-21 19:30:13,854 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 19:30:13,854 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:30:13,864 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 19:30:13,865 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 19:30:13,866 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 5 states. [2020-07-21 19:30:13,987 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:30:13,988 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2020-07-21 19:30:13,990 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 19:30:13,992 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 19:30:13,993 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:30:14,014 INFO L225 Difference]: With dead ends: 35 [2020-07-21 19:30:14,014 INFO L226 Difference]: Without dead ends: 21 [2020-07-21 19:30:14,018 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 [2020-07-21 19:30:14,038 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-21 19:30:14,065 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-21 19:30:14,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 19:30:14,069 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-21 19:30:14,071 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2020-07-21 19:30:14,072 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:30:14,072 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-21 19:30:14,079 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 19:30:14,080 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-21 19:30:14,082 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 19:30:14,082 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:30:14,082 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:30:14,296 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:14,297 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:30:14,297 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:30:14,298 INFO L82 PathProgramCache]: Analyzing trace with hash 179123823, now seen corresponding path program 1 times [2020-07-21 19:30:14,298 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:30:14,298 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [470382224] [2020-07-21 19:30:14,299 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:14,337 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:30:14,337 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:30:14,338 INFO L263 TraceCheckSpWp]: Trace formula consists of 20 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 19:30:14,340 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:30:14,375 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 19:30:14,375 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:30:14,375 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [470382224] [2020-07-21 19:30:14,376 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:30:14,376 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 19:30:14,376 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [584639701] [2020-07-21 19:30:14,379 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 19:30:14,379 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:30:14,380 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 19:30:14,380 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 19:30:14,380 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 5 states. [2020-07-21 19:30:14,451 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:30:14,452 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-07-21 19:30:14,453 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 19:30:14,453 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-21 19:30:14,454 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:30:14,455 INFO L225 Difference]: With dead ends: 27 [2020-07-21 19:30:14,455 INFO L226 Difference]: Without dead ends: 23 [2020-07-21 19:30:14,457 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 [2020-07-21 19:30:14,458 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-21 19:30:14,464 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2020-07-21 19:30:14,465 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 19:30:14,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-21 19:30:14,466 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 14 [2020-07-21 19:30:14,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:30:14,467 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-21 19:30:14,467 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 19:30:14,468 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-21 19:30:14,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 19:30:14,469 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:30:14,469 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] [2020-07-21 19:30:14,684 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:14,685 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:30:14,685 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:30:14,686 INFO L82 PathProgramCache]: Analyzing trace with hash 806022394, now seen corresponding path program 1 times [2020-07-21 19:30:14,686 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:30:14,687 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [382309545] [2020-07-21 19:30:14,687 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:14,737 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:30:14,739 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:30:14,740 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 19:30:14,743 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:30:14,790 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 19:30:14,790 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:30:14,996 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:15,054 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-21 19:30:15,055 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [382309545] [2020-07-21 19:30:15,055 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:30:15,055 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-21 19:30:15,056 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2041782546] [2020-07-21 19:30:15,056 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 19:30:15,057 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:30:15,057 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 19:30:15,058 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-21 19:30:15,058 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 9 states. [2020-07-21 19:30:15,203 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:30:15,203 INFO L93 Difference]: Finished difference Result 32 states and 42 transitions. [2020-07-21 19:30:15,204 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 19:30:15,205 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-07-21 19:30:15,205 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:30:15,207 INFO L225 Difference]: With dead ends: 32 [2020-07-21 19:30:15,207 INFO L226 Difference]: Without dead ends: 28 [2020-07-21 19:30:15,208 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 [2020-07-21 19:30:15,209 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-21 19:30:15,216 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-07-21 19:30:15,216 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 19:30:15,218 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-21 19:30:15,218 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 26 [2020-07-21 19:30:15,218 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:30:15,219 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-21 19:30:15,219 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 19:30:15,219 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-21 19:30:15,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 19:30:15,221 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:30:15,221 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] [2020-07-21 19:30:15,436 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:15,436 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:30:15,437 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:30:15,437 INFO L82 PathProgramCache]: Analyzing trace with hash -983862936, now seen corresponding path program 1 times [2020-07-21 19:30:15,438 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:30:15,438 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1360997773] [2020-07-21 19:30:15,439 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:15,488 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:30:15,489 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:30:15,490 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 19:30:15,493 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:30:15,549 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-21 19:30:15,550 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:30:15,710 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:15,750 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-21 19:30:15,751 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1360997773] [2020-07-21 19:30:15,751 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:30:15,752 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-21 19:30:15,752 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1945787372] [2020-07-21 19:30:15,752 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 19:30:15,753 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:30:15,753 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 19:30:15,754 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-21 19:30:15,754 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 9 states. [2020-07-21 19:30:15,840 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:30:15,840 INFO L93 Difference]: Finished difference Result 37 states and 54 transitions. [2020-07-21 19:30:15,841 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 19:30:15,841 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2020-07-21 19:30:15,842 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:30:15,843 INFO L225 Difference]: With dead ends: 37 [2020-07-21 19:30:15,844 INFO L226 Difference]: Without dead ends: 33 [2020-07-21 19:30:15,845 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 [2020-07-21 19:30:15,845 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-21 19:30:15,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 26. [2020-07-21 19:30:15,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 19:30:15,854 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-21 19:30:15,854 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 27 [2020-07-21 19:30:15,855 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:30:15,855 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-21 19:30:15,855 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 19:30:15,855 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-21 19:30:15,856 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-21 19:30:15,857 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:30:15,857 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] [2020-07-21 19:30:16,071 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:16,073 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:30:16,074 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:30:16,074 INFO L82 PathProgramCache]: Analyzing trace with hash -2027372739, now seen corresponding path program 2 times [2020-07-21 19:30:16,075 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:30:16,075 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [336622820] [2020-07-21 19:30:16,075 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:16,126 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:30:16,126 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:30:16,127 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 19:30:16,130 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:30:16,178 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 21 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-21 19:30:16,178 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:30:16,422 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:16,424 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:16,490 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:16,491 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:16,537 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 26 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-21 19:30:16,538 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [336622820] [2020-07-21 19:30:16,538 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:30:16,538 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-21 19:30:16,538 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1233140589] [2020-07-21 19:30:16,539 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 19:30:16,539 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:30:16,539 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 19:30:16,540 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-21 19:30:16,540 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 11 states. [2020-07-21 19:30:16,733 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:30:16,733 INFO L93 Difference]: Finished difference Result 42 states and 68 transitions. [2020-07-21 19:30:16,734 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 19:30:16,734 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 39 [2020-07-21 19:30:16,735 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:30:16,737 INFO L225 Difference]: With dead ends: 42 [2020-07-21 19:30:16,737 INFO L226 Difference]: Without dead ends: 38 [2020-07-21 19:30:16,738 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 [2020-07-21 19:30:16,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-21 19:30:16,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 31. [2020-07-21 19:30:16,752 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-21 19:30:16,754 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-21 19:30:16,755 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 39 [2020-07-21 19:30:16,755 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:30:16,755 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-21 19:30:16,755 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 19:30:16,755 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-21 19:30:16,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-21 19:30:16,757 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:30:16,758 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] [2020-07-21 19:30:16,961 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:16,962 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:30:16,962 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:30:16,962 INFO L82 PathProgramCache]: Analyzing trace with hash -1111873851, now seen corresponding path program 2 times [2020-07-21 19:30:16,963 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:30:16,963 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [452057150] [2020-07-21 19:30:16,964 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:17,004 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:30:17,005 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:30:17,006 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 19:30:17,009 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:30:17,065 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 24 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-07-21 19:30:17,066 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:30:17,280 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:17,338 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:17,339 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:17,376 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 31 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-21 19:30:17,377 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [452057150] [2020-07-21 19:30:17,377 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:30:17,378 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-21 19:30:17,378 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1916868602] [2020-07-21 19:30:17,379 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 19:30:17,379 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:30:17,379 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 19:30:17,379 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-21 19:30:17,380 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 11 states. [2020-07-21 19:30:17,528 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:30:17,528 INFO L93 Difference]: Finished difference Result 47 states and 84 transitions. [2020-07-21 19:30:17,529 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 19:30:17,529 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 41 [2020-07-21 19:30:17,530 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:30:17,531 INFO L225 Difference]: With dead ends: 47 [2020-07-21 19:30:17,531 INFO L226 Difference]: Without dead ends: 43 [2020-07-21 19:30:17,532 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 [2020-07-21 19:30:17,533 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-07-21 19:30:17,541 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 31. [2020-07-21 19:30:17,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-21 19:30:17,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-21 19:30:17,543 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 41 [2020-07-21 19:30:17,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:30:17,543 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-21 19:30:17,544 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 19:30:17,544 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-21 19:30:17,546 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-07-21 19:30:17,546 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:30:17,546 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] [2020-07-21 19:30:17,761 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:17,762 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:30:17,763 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:30:17,763 INFO L82 PathProgramCache]: Analyzing trace with hash -767819153, now seen corresponding path program 3 times [2020-07-21 19:30:17,764 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:30:17,764 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [901398639] [2020-07-21 19:30:17,764 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:17,814 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:30:17,814 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:30:17,815 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 19:30:17,818 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:30:17,884 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 79 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-07-21 19:30:17,884 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:30:18,331 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:18,436 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:18,437 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:18,486 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:18,487 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:18,534 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 91 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2020-07-21 19:30:18,535 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [901398639] [2020-07-21 19:30:18,535 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:30:18,535 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-21 19:30:18,535 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [749894675] [2020-07-21 19:30:18,536 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 19:30:18,537 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:30:18,537 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 19:30:18,537 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-21 19:30:18,537 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 13 states. [2020-07-21 19:30:18,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:30:18,737 INFO L93 Difference]: Finished difference Result 52 states and 102 transitions. [2020-07-21 19:30:18,737 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 19:30:18,738 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 65 [2020-07-21 19:30:18,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:30:18,740 INFO L225 Difference]: With dead ends: 52 [2020-07-21 19:30:18,740 INFO L226 Difference]: Without dead ends: 48 [2020-07-21 19:30:18,741 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 [2020-07-21 19:30:18,741 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-21 19:30:18,750 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 36. [2020-07-21 19:30:18,751 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 19:30:18,752 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-21 19:30:18,752 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 65 [2020-07-21 19:30:18,752 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:30:18,753 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-21 19:30:18,753 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 19:30:18,753 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-21 19:30:18,755 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-07-21 19:30:18,755 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:30:18,756 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] [2020-07-21 19:30:18,960 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:18,961 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:30:18,962 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:30:18,962 INFO L82 PathProgramCache]: Analyzing trace with hash 1474757101, now seen corresponding path program 3 times [2020-07-21 19:30:18,963 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:30:18,963 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [170791933] [2020-07-21 19:30:18,964 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:19,030 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:30:19,031 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:30:19,032 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 19:30:19,035 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:30:19,119 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 166 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2020-07-21 19:30:19,120 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:30:19,585 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:19,690 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:19,695 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:19,743 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:19,796 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 181 refuted. 0 times theorem prover too weak. 219 trivial. 0 not checked. [2020-07-21 19:30:19,797 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [170791933] [2020-07-21 19:30:19,797 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:30:19,797 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-21 19:30:19,798 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2022537812] [2020-07-21 19:30:19,798 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 19:30:19,798 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:30:19,799 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 19:30:19,799 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-21 19:30:19,799 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 13 states. [2020-07-21 19:30:19,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:30:19,949 INFO L93 Difference]: Finished difference Result 57 states and 122 transitions. [2020-07-21 19:30:19,952 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 19:30:19,953 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 96 [2020-07-21 19:30:19,953 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:30:19,955 INFO L225 Difference]: With dead ends: 57 [2020-07-21 19:30:19,955 INFO L226 Difference]: Without dead ends: 53 [2020-07-21 19:30:19,956 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 [2020-07-21 19:30:19,956 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-07-21 19:30:19,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 36. [2020-07-21 19:30:19,972 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 19:30:19,973 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-21 19:30:19,973 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 96 [2020-07-21 19:30:19,974 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:30:19,974 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-21 19:30:19,974 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 19:30:19,975 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-21 19:30:19,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-07-21 19:30:19,977 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:30:19,977 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] [2020-07-21 19:30:20,181 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:20,182 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:30:20,182 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:30:20,183 INFO L82 PathProgramCache]: Analyzing trace with hash 838335741, now seen corresponding path program 4 times [2020-07-21 19:30:20,183 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:30:20,184 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2081448335] [2020-07-21 19:30:20,185 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:20,263 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:30:20,264 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:30:20,265 INFO L263 TraceCheckSpWp]: Trace formula consists of 262 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 19:30:20,269 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:30:20,375 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 244 refuted. 0 times theorem prover too weak. 386 trivial. 0 not checked. [2020-07-21 19:30:20,375 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:30:20,997 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:20,999 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:21,193 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:21,279 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:21,337 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:21,380 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 266 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2020-07-21 19:30:21,381 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2081448335] [2020-07-21 19:30:21,381 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:30:21,382 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-21 19:30:21,382 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2143670047] [2020-07-21 19:30:21,382 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 19:30:21,383 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:30:21,383 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 19:30:21,383 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-21 19:30:21,384 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 15 states. [2020-07-21 19:30:21,671 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:30:21,671 INFO L93 Difference]: Finished difference Result 62 states and 144 transitions. [2020-07-21 19:30:21,672 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 19:30:21,672 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 117 [2020-07-21 19:30:21,673 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:30:21,675 INFO L225 Difference]: With dead ends: 62 [2020-07-21 19:30:21,675 INFO L226 Difference]: Without dead ends: 58 [2020-07-21 19:30:21,676 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 [2020-07-21 19:30:21,677 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-07-21 19:30:21,688 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 41. [2020-07-21 19:30:21,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-21 19:30:21,690 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-21 19:30:21,690 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 117 [2020-07-21 19:30:21,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:30:21,691 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-21 19:30:21,691 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 19:30:21,691 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-21 19:30:21,695 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2020-07-21 19:30:21,695 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:30:21,695 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] [2020-07-21 19:30:21,908 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:21,909 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:30:21,909 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:30:21,909 INFO L82 PathProgramCache]: Analyzing trace with hash -2072922826, now seen corresponding path program 4 times [2020-07-21 19:30:21,910 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:30:21,910 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [18464328] [2020-07-21 19:30:21,910 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:22,000 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:30:22,001 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:30:22,002 INFO L263 TraceCheckSpWp]: Trace formula consists of 423 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 19:30:22,006 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:30:22,102 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 86 proven. 506 refuted. 0 times theorem prover too weak. 1334 trivial. 0 not checked. [2020-07-21 19:30:22,103 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:30:22,851 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:23,081 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:23,167 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:23,168 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:23,214 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:23,215 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:23,290 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 86 proven. 532 refuted. 0 times theorem prover too weak. 1308 trivial. 0 not checked. [2020-07-21 19:30:23,290 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [18464328] [2020-07-21 19:30:23,290 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:30:23,291 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-21 19:30:23,291 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1297306805] [2020-07-21 19:30:23,292 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 19:30:23,292 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:30:23,292 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 19:30:23,293 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-21 19:30:23,293 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 15 states. [2020-07-21 19:30:23,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:30:23,464 INFO L93 Difference]: Finished difference Result 67 states and 168 transitions. [2020-07-21 19:30:23,464 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 19:30:23,464 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 190 [2020-07-21 19:30:23,466 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:30:23,468 INFO L225 Difference]: With dead ends: 67 [2020-07-21 19:30:23,468 INFO L226 Difference]: Without dead ends: 63 [2020-07-21 19:30:23,469 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 [2020-07-21 19:30:23,471 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-07-21 19:30:23,491 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 41. [2020-07-21 19:30:23,491 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-21 19:30:23,496 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-21 19:30:23,496 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 190 [2020-07-21 19:30:23,497 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:30:23,497 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-21 19:30:23,497 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 19:30:23,497 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-21 19:30:23,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 287 [2020-07-21 19:30:23,501 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:30:23,502 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] [2020-07-21 19:30:23,716 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:23,718 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:30:23,718 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:30:23,718 INFO L82 PathProgramCache]: Analyzing trace with hash -1082984306, now seen corresponding path program 5 times [2020-07-21 19:30:23,719 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:30:23,719 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [204517696] [2020-07-21 19:30:23,720 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:23,850 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:30:23,850 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:30:23,853 INFO L263 TraceCheckSpWp]: Trace formula consists of 639 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 19:30:23,858 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:30:23,973 INFO L134 CoverageAnalysis]: Checked inductivity of 4662 backedges. 159 proven. 967 refuted. 0 times theorem prover too weak. 3536 trivial. 0 not checked. [2020-07-21 19:30:23,973 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:30:25,205 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:25,548 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:25,704 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:25,786 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:25,831 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:25,832 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:25,933 INFO L134 CoverageAnalysis]: Checked inductivity of 4662 backedges. 159 proven. 1002 refuted. 0 times theorem prover too weak. 3501 trivial. 0 not checked. [2020-07-21 19:30:25,934 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [204517696] [2020-07-21 19:30:25,934 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:30:25,934 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-21 19:30:25,935 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1437608887] [2020-07-21 19:30:25,936 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 19:30:25,936 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:30:25,936 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 19:30:25,937 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-21 19:30:25,937 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 17 states. [2020-07-21 19:30:26,161 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:30:26,161 INFO L93 Difference]: Finished difference Result 72 states and 194 transitions. [2020-07-21 19:30:26,162 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 19:30:26,162 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 286 [2020-07-21 19:30:26,164 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:30:26,166 INFO L225 Difference]: With dead ends: 72 [2020-07-21 19:30:26,166 INFO L226 Difference]: Without dead ends: 68 [2020-07-21 19:30:26,167 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 [2020-07-21 19:30:26,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-07-21 19:30:26,178 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 46. [2020-07-21 19:30:26,179 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-21 19:30:26,180 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-21 19:30:26,180 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 286 [2020-07-21 19:30:26,181 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:30:26,181 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-21 19:30:26,182 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 19:30:26,182 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-21 19:30:26,187 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 300 [2020-07-21 19:30:26,187 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:30:26,187 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] [2020-07-21 19:30:26,411 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:26,411 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:30:26,412 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:30:26,412 INFO L82 PathProgramCache]: Analyzing trace with hash 1006419304, now seen corresponding path program 5 times [2020-07-21 19:30:26,413 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:30:26,413 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [158504333] [2020-07-21 19:30:26,413 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:26,566 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:30:26,566 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:30:26,569 INFO L263 TraceCheckSpWp]: Trace formula consists of 665 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 19:30:26,576 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:30:26,719 INFO L134 CoverageAnalysis]: Checked inductivity of 5013 backedges. 159 proven. 1055 refuted. 0 times theorem prover too weak. 3799 trivial. 0 not checked. [2020-07-21 19:30:26,720 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:30:27,992 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:28,337 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:28,487 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:28,573 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:28,575 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:28,623 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:28,728 INFO L134 CoverageAnalysis]: Checked inductivity of 5013 backedges. 159 proven. 1095 refuted. 0 times theorem prover too weak. 3759 trivial. 0 not checked. [2020-07-21 19:30:28,728 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [158504333] [2020-07-21 19:30:28,728 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:30:28,728 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-21 19:30:28,729 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1997787864] [2020-07-21 19:30:28,730 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 19:30:28,730 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:30:28,730 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 19:30:28,731 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-21 19:30:28,731 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 17 states. [2020-07-21 19:30:28,944 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:30:28,944 INFO L93 Difference]: Finished difference Result 77 states and 222 transitions. [2020-07-21 19:30:28,945 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 19:30:28,945 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 299 [2020-07-21 19:30:28,946 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:30:28,949 INFO L225 Difference]: With dead ends: 77 [2020-07-21 19:30:28,949 INFO L226 Difference]: Without dead ends: 73 [2020-07-21 19:30:28,951 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 [2020-07-21 19:30:28,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-07-21 19:30:28,979 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 46. [2020-07-21 19:30:28,982 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-21 19:30:28,983 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-21 19:30:28,983 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 299 [2020-07-21 19:30:28,984 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:30:28,984 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-21 19:30:28,984 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 19:30:28,985 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-21 19:30:28,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 508 [2020-07-21 19:30:28,992 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:30:28,992 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] [2020-07-21 19:30:29,206 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:29,206 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:30:29,207 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:30:29,207 INFO L82 PathProgramCache]: Analyzing trace with hash 785285043, now seen corresponding path program 6 times [2020-07-21 19:30:29,207 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:30:29,208 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1393727735] [2020-07-21 19:30:29,208 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:29,427 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:30:29,428 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:30:29,430 INFO L263 TraceCheckSpWp]: Trace formula consists of 1132 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 19:30:29,439 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:30:29,669 INFO L134 CoverageAnalysis]: Checked inductivity of 15219 backedges. 391 proven. 2126 refuted. 0 times theorem prover too weak. 12702 trivial. 0 not checked. [2020-07-21 19:30:29,669 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:30:31,618 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:32,199 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:32,627 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:32,832 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:32,832 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:32,914 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:32,968 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:32,969 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:33,159 INFO L134 CoverageAnalysis]: Checked inductivity of 15219 backedges. 391 proven. 2177 refuted. 0 times theorem prover too weak. 12651 trivial. 0 not checked. [2020-07-21 19:30:33,160 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1393727735] [2020-07-21 19:30:33,160 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:30:33,160 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-21 19:30:33,160 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [585899026] [2020-07-21 19:30:33,161 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 19:30:33,161 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:30:33,162 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 19:30:33,162 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-21 19:30:33,162 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 19 states. [2020-07-21 19:30:33,602 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:30:33,602 INFO L93 Difference]: Finished difference Result 82 states and 252 transitions. [2020-07-21 19:30:33,603 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 19:30:33,603 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 507 [2020-07-21 19:30:33,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:30:33,607 INFO L225 Difference]: With dead ends: 82 [2020-07-21 19:30:33,607 INFO L226 Difference]: Without dead ends: 78 [2020-07-21 19:30:33,608 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 [2020-07-21 19:30:33,608 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-07-21 19:30:33,621 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 51. [2020-07-21 19:30:33,622 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-21 19:30:33,624 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 109 transitions. [2020-07-21 19:30:33,624 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 109 transitions. Word has length 507 [2020-07-21 19:30:33,625 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:30:33,625 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 109 transitions. [2020-07-21 19:30:33,625 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 19:30:33,625 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 109 transitions. [2020-07-21 19:30:33,629 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 451 [2020-07-21 19:30:33,629 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:30:33,629 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] [2020-07-21 19:30:33,843 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:33,843 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:30:33,844 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:30:33,844 INFO L82 PathProgramCache]: Analyzing trace with hash -1350718391, now seen corresponding path program 6 times [2020-07-21 19:30:33,845 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:30:33,845 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2049641380] [2020-07-21 19:30:33,845 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:34,050 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:30:34,051 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:30:34,053 INFO L263 TraceCheckSpWp]: Trace formula consists of 1000 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 19:30:34,068 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:30:34,262 INFO L134 CoverageAnalysis]: Checked inductivity of 11682 backedges. 333 proven. 1918 refuted. 0 times theorem prover too weak. 9431 trivial. 0 not checked. [2020-07-21 19:30:34,262 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:30:35,960 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:36,589 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:36,589 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:36,932 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:36,933 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:37,094 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:37,190 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:37,191 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:37,255 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:37,393 INFO L134 CoverageAnalysis]: Checked inductivity of 11682 backedges. 333 proven. 1975 refuted. 0 times theorem prover too weak. 9374 trivial. 0 not checked. [2020-07-21 19:30:37,394 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2049641380] [2020-07-21 19:30:37,394 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:30:37,394 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-21 19:30:37,394 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [933456609] [2020-07-21 19:30:37,395 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 19:30:37,395 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:30:37,396 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 19:30:37,396 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-21 19:30:37,396 INFO L87 Difference]: Start difference. First operand 51 states and 109 transitions. Second operand 19 states. [2020-07-21 19:30:37,673 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:30:37,673 INFO L93 Difference]: Finished difference Result 87 states and 284 transitions. [2020-07-21 19:30:37,673 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 19:30:37,674 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 450 [2020-07-21 19:30:37,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:30:37,677 INFO L225 Difference]: With dead ends: 87 [2020-07-21 19:30:37,677 INFO L226 Difference]: Without dead ends: 83 [2020-07-21 19:30:37,679 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 [2020-07-21 19:30:37,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-07-21 19:30:37,699 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 51. [2020-07-21 19:30:37,699 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-21 19:30:37,701 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 109 transitions. [2020-07-21 19:30:37,701 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 109 transitions. Word has length 450 [2020-07-21 19:30:37,702 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:30:37,702 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 109 transitions. [2020-07-21 19:30:37,702 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 19:30:37,703 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 109 transitions. [2020-07-21 19:30:37,713 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1067 [2020-07-21 19:30:37,714 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:30:37,714 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] [2020-07-21 19:30:37,922 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:37,922 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:30:37,923 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:30:37,923 INFO L82 PathProgramCache]: Analyzing trace with hash 40336450, now seen corresponding path program 7 times [2020-07-21 19:30:37,924 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:30:37,924 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [913940063] [2020-07-21 19:30:37,925 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:38,382 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:30:38,382 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:30:38,388 INFO L263 TraceCheckSpWp]: Trace formula consists of 2379 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 19:30:38,403 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:30:39,307 INFO L134 CoverageAnalysis]: Checked inductivity of 69012 backedges. 797 proven. 5632 refuted. 0 times theorem prover too weak. 62583 trivial. 0 not checked. [2020-07-21 19:30:39,307 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:30:43,014 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:43,015 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:44,369 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:44,904 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:44,905 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:45,260 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:45,261 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:45,419 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:45,420 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:45,505 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:45,506 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:45,570 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:46,086 INFO L134 CoverageAnalysis]: Checked inductivity of 69012 backedges. 797 proven. 5702 refuted. 0 times theorem prover too weak. 62513 trivial. 0 not checked. [2020-07-21 19:30:46,087 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [913940063] [2020-07-21 19:30:46,087 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:30:46,088 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-21 19:30:46,088 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2087305165] [2020-07-21 19:30:46,090 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 19:30:46,090 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:30:46,090 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 19:30:46,090 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-21 19:30:46,091 INFO L87 Difference]: Start difference. First operand 51 states and 109 transitions. Second operand 21 states. [2020-07-21 19:30:46,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:30:46,737 INFO L93 Difference]: Finished difference Result 92 states and 318 transitions. [2020-07-21 19:30:46,738 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 19:30:46,738 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1066 [2020-07-21 19:30:46,741 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:30:46,745 INFO L225 Difference]: With dead ends: 92 [2020-07-21 19:30:46,745 INFO L226 Difference]: Without dead ends: 88 [2020-07-21 19:30:46,750 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 [2020-07-21 19:30:46,750 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-07-21 19:30:46,773 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 56. [2020-07-21 19:30:46,774 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-21 19:30:46,779 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 130 transitions. [2020-07-21 19:30:46,779 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 130 transitions. Word has length 1066 [2020-07-21 19:30:46,781 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:30:46,781 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 130 transitions. [2020-07-21 19:30:46,782 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 19:30:46,782 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 130 transitions. [2020-07-21 19:30:46,792 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 821 [2020-07-21 19:30:46,792 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:30:46,793 INFO L422 BasicCegarLoop]: trace histogram [119, 119, 99, 59, 59, 59, 59, 59, 59, 59, 40, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:30:47,007 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:47,007 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:30:47,008 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:30:47,008 INFO L82 PathProgramCache]: Analyzing trace with hash 256338188, now seen corresponding path program 7 times [2020-07-21 19:30:47,009 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:30:47,009 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1965696250] [2020-07-21 19:30:47,009 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:47,396 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:30:47,396 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:30:47,400 INFO L263 TraceCheckSpWp]: Trace formula consists of 1821 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 19:30:47,413 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:30:47,813 INFO L134 CoverageAnalysis]: Checked inductivity of 39779 backedges. 582 proven. 4385 refuted. 0 times theorem prover too weak. 34812 trivial. 0 not checked. [2020-07-21 19:30:47,814 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:30:50,927 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:50,929 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:51,856 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:52,315 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:52,316 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:52,590 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:52,592 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:52,790 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:52,919 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:52,974 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:53,280 INFO L134 CoverageAnalysis]: Checked inductivity of 39779 backedges. 582 proven. 4462 refuted. 0 times theorem prover too weak. 34735 trivial. 0 not checked. [2020-07-21 19:30:53,280 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1965696250] [2020-07-21 19:30:53,281 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:30:53,281 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-21 19:30:53,281 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [658548666] [2020-07-21 19:30:53,283 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 19:30:53,283 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:30:53,283 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 19:30:53,284 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-21 19:30:53,284 INFO L87 Difference]: Start difference. First operand 56 states and 130 transitions. Second operand 21 states. [2020-07-21 19:30:53,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:30:53,949 INFO L93 Difference]: Finished difference Result 97 states and 354 transitions. [2020-07-21 19:30:53,950 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 19:30:53,950 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 820 [2020-07-21 19:30:53,952 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:30:53,956 INFO L225 Difference]: With dead ends: 97 [2020-07-21 19:30:53,957 INFO L226 Difference]: Without dead ends: 93 [2020-07-21 19:30:53,958 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1647 GetRequests, 1604 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2020-07-21 19:30:53,959 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-07-21 19:30:53,973 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 56. [2020-07-21 19:30:53,973 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-21 19:30:53,975 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 130 transitions. [2020-07-21 19:30:53,976 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 130 transitions. Word has length 820 [2020-07-21 19:30:53,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:30:53,978 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 130 transitions. [2020-07-21 19:30:53,979 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 19:30:53,979 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 130 transitions. [2020-07-21 19:30:54,012 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1405 [2020-07-21 19:30:54,013 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:30:54,014 INFO L422 BasicCegarLoop]: trace histogram [215, 215, 108, 107, 107, 107, 107, 107, 107, 107, 107, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:30:54,227 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:54,228 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:30:54,228 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:30:54,229 INFO L82 PathProgramCache]: Analyzing trace with hash -60458800, now seen corresponding path program 8 times [2020-07-21 19:30:54,229 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:30:54,229 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1930569264] [2020-07-21 19:30:54,230 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:54,829 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:30:54,829 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:30:54,838 INFO L263 TraceCheckSpWp]: Trace formula consists of 3133 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 19:30:54,856 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:30:55,785 INFO L134 CoverageAnalysis]: Checked inductivity of 120375 backedges. 1323 proven. 8355 refuted. 0 times theorem prover too weak. 110697 trivial. 0 not checked. [2020-07-21 19:30:55,785 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:31:00,408 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:02,608 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:03,854 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:04,320 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:04,321 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:04,636 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:04,637 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:04,827 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:04,945 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:04,946 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:05,011 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:05,012 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:06,151 INFO L134 CoverageAnalysis]: Checked inductivity of 120375 backedges. 1323 proven. 8447 refuted. 0 times theorem prover too weak. 110605 trivial. 0 not checked. [2020-07-21 19:31:06,152 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1930569264] [2020-07-21 19:31:06,152 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:31:06,153 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-21 19:31:06,153 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1451914150] [2020-07-21 19:31:06,155 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 19:31:06,155 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:31:06,156 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 19:31:06,156 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-21 19:31:06,156 INFO L87 Difference]: Start difference. First operand 56 states and 130 transitions. Second operand 23 states. [2020-07-21 19:31:06,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:31:06,818 INFO L93 Difference]: Finished difference Result 102 states and 392 transitions. [2020-07-21 19:31:06,819 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 19:31:06,819 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1404 [2020-07-21 19:31:06,822 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:31:06,826 INFO L225 Difference]: With dead ends: 102 [2020-07-21 19:31:06,827 INFO L226 Difference]: Without dead ends: 98 [2020-07-21 19:31:06,828 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2817 GetRequests, 2769 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2020-07-21 19:31:06,829 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-07-21 19:31:06,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 61. [2020-07-21 19:31:06,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-21 19:31:06,848 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 153 transitions. [2020-07-21 19:31:06,849 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 153 transitions. Word has length 1404 [2020-07-21 19:31:06,851 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:31:06,851 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 153 transitions. [2020-07-21 19:31:06,852 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 19:31:06,852 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 153 transitions. [2020-07-21 19:31:06,880 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1616 [2020-07-21 19:31:06,881 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:31:06,882 INFO L422 BasicCegarLoop]: trace histogram [237, 237, 186, 118, 118, 118, 118, 118, 118, 118, 68, 51, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:31:07,095 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:31:07,096 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:31:07,096 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:31:07,096 INFO L82 PathProgramCache]: Analyzing trace with hash 189714815, now seen corresponding path program 8 times [2020-07-21 19:31:07,097 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:31:07,097 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [567505031] [2020-07-21 19:31:07,097 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:31:07,746 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:31:07,747 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:31:07,756 INFO L263 TraceCheckSpWp]: Trace formula consists of 3588 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 19:31:07,774 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:31:08,948 INFO L134 CoverageAnalysis]: Checked inductivity of 156681 backedges. 1441 proven. 9984 refuted. 0 times theorem prover too weak. 145256 trivial. 0 not checked. [2020-07-21 19:31:08,948 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:31:14,336 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:16,527 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:16,528 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:17,549 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:17,550 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:18,098 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:18,477 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:18,478 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:18,685 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:18,777 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:18,831 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:19,786 INFO L134 CoverageAnalysis]: Checked inductivity of 156681 backedges. 1441 proven. 10084 refuted. 0 times theorem prover too weak. 145156 trivial. 0 not checked. [2020-07-21 19:31:19,787 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [567505031] [2020-07-21 19:31:19,787 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:31:19,787 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-21 19:31:19,788 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1460589098] [2020-07-21 19:31:19,789 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 19:31:19,789 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:31:19,790 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 19:31:19,790 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-21 19:31:19,790 INFO L87 Difference]: Start difference. First operand 61 states and 153 transitions. Second operand 23 states. [2020-07-21 19:31:20,190 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:31:20,190 INFO L93 Difference]: Finished difference Result 107 states and 432 transitions. [2020-07-21 19:31:20,191 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 19:31:20,191 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1615 [2020-07-21 19:31:20,194 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:31:20,198 INFO L225 Difference]: With dead ends: 107 [2020-07-21 19:31:20,198 INFO L226 Difference]: Without dead ends: 103 [2020-07-21 19:31:20,199 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3238 GetRequests, 3190 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2020-07-21 19:31:20,200 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2020-07-21 19:31:20,212 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 61. [2020-07-21 19:31:20,212 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-21 19:31:20,213 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 153 transitions. [2020-07-21 19:31:20,214 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 153 transitions. Word has length 1615 [2020-07-21 19:31:20,216 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:31:20,216 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 153 transitions. [2020-07-21 19:31:20,216 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 19:31:20,216 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 153 transitions. [2020-07-21 19:31:20,267 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2575 [2020-07-21 19:31:20,267 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:31:20,269 INFO L422 BasicCegarLoop]: trace histogram [395, 395, 198, 197, 197, 197, 197, 197, 197, 197, 197, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:31:20,482 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:31:20,483 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:31:20,483 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:31:20,484 INFO L82 PathProgramCache]: Analyzing trace with hash 95565462, now seen corresponding path program 9 times [2020-07-21 19:31:20,484 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:31:20,484 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [918291716] [2020-07-21 19:31:20,485 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:31:21,433 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:31:21,434 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:31:21,444 INFO L263 TraceCheckSpWp]: Trace formula consists of 5743 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 19:31:21,470 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:31:24,090 INFO L134 CoverageAnalysis]: Checked inductivity of 407790 backedges. 2332 proven. 17876 refuted. 0 times theorem prover too weak. 387582 trivial. 0 not checked. [2020-07-21 19:31:24,090 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:31:33,640 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:36,802 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:38,522 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:39,478 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:39,479 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:40,197 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:40,198 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:40,547 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:40,547 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:40,728 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:40,829 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:40,885 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:43,069 INFO L134 CoverageAnalysis]: Checked inductivity of 407790 backedges. 2332 proven. 17993 refuted. 0 times theorem prover too weak. 387465 trivial. 0 not checked. [2020-07-21 19:31:43,070 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [918291716] [2020-07-21 19:31:43,070 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:31:43,071 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 25 [2020-07-21 19:31:43,071 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1580264050] [2020-07-21 19:31:43,073 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 19:31:43,073 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:31:43,073 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 19:31:43,073 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2020-07-21 19:31:43,074 INFO L87 Difference]: Start difference. First operand 61 states and 153 transitions. Second operand 25 states. [2020-07-21 19:31:43,878 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:31:43,878 INFO L93 Difference]: Finished difference Result 112 states and 474 transitions. [2020-07-21 19:31:43,886 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 19:31:43,886 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 2574 [2020-07-21 19:31:43,889 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:31:43,893 INFO L225 Difference]: With dead ends: 112 [2020-07-21 19:31:43,893 INFO L226 Difference]: Without dead ends: 108 [2020-07-21 19:31:43,895 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5158 GetRequests, 5105 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 19:31:43,895 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-07-21 19:31:43,909 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 66. [2020-07-21 19:31:43,909 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-07-21 19:31:43,911 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 178 transitions. [2020-07-21 19:31:43,911 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 178 transitions. Word has length 2574 [2020-07-21 19:31:43,913 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:31:43,913 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 178 transitions. [2020-07-21 19:31:43,914 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 19:31:43,914 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 178 transitions. [2020-07-21 19:31:43,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2695 [2020-07-21 19:31:43,973 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:31:43,975 INFO L422 BasicCegarLoop]: trace histogram [395, 395, 317, 197, 197, 197, 197, 197, 197, 197, 120, 78, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:31:44,188 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:31:44,189 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:31:44,189 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:31:44,189 INFO L82 PathProgramCache]: Analyzing trace with hash 6978708, now seen corresponding path program 9 times [2020-07-21 19:31:44,190 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:31:44,190 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [904340319] [2020-07-21 19:31:44,190 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:31:45,215 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:31:45,216 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:31:45,227 INFO L263 TraceCheckSpWp]: Trace formula consists of 5983 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 19:31:45,293 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:31:48,731 INFO L134 CoverageAnalysis]: Checked inductivity of 438570 backedges. 2626 proven. 18960 refuted. 0 times theorem prover too weak. 416984 trivial. 0 not checked. [2020-07-21 19:31:48,731 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:31:57,008 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:01,675 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:03,901 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:03,902 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:05,175 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:05,832 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:06,138 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:06,348 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:06,454 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:06,455 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:06,513 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:06,514 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:08,851 INFO L134 CoverageAnalysis]: Checked inductivity of 438570 backedges. 2626 proven. 19086 refuted. 0 times theorem prover too weak. 416858 trivial. 0 not checked. [2020-07-21 19:32:08,851 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [904340319] [2020-07-21 19:32:08,851 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:32:08,852 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 25 [2020-07-21 19:32:08,852 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1525937379] [2020-07-21 19:32:08,854 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 19:32:08,854 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:32:08,854 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 19:32:08,854 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2020-07-21 19:32:08,854 INFO L87 Difference]: Start difference. First operand 66 states and 178 transitions. Second operand 25 states. [2020-07-21 19:32:09,521 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:32:09,521 INFO L93 Difference]: Finished difference Result 117 states and 518 transitions. [2020-07-21 19:32:09,522 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 19:32:09,522 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 2694 [2020-07-21 19:32:09,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:32:09,529 INFO L225 Difference]: With dead ends: 117 [2020-07-21 19:32:09,529 INFO L226 Difference]: Without dead ends: 113 [2020-07-21 19:32:09,530 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5397 GetRequests, 5344 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 19:32:09,530 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2020-07-21 19:32:09,545 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 66. [2020-07-21 19:32:09,546 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-07-21 19:32:09,547 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 178 transitions. [2020-07-21 19:32:09,547 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 178 transitions. Word has length 2694 [2020-07-21 19:32:09,549 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:32:09,549 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 178 transitions. [2020-07-21 19:32:09,549 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 19:32:09,549 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 178 transitions. [2020-07-21 19:32:09,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5188 [2020-07-21 19:32:09,721 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:32:09,722 INFO L422 BasicCegarLoop]: trace histogram [797, 797, 399, 398, 398, 398, 398, 398, 398, 398, 398, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:32:09,924 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:32:09,925 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:32:09,926 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:32:09,928 INFO L82 PathProgramCache]: Analyzing trace with hash 949139471, now seen corresponding path program 10 times [2020-07-21 19:32:09,928 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:32:09,928 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1333463320] [2020-07-21 19:32:09,929 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:32:11,880 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:32:11,880 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:32:11,905 INFO L263 TraceCheckSpWp]: Trace formula consists of 11572 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 19:32:11,946 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:32:20,733 INFO L134 CoverageAnalysis]: Checked inductivity of 1663839 backedges. 5578 proven. 40005 refuted. 0 times theorem prover too weak. 1618256 trivial. 0 not checked. [2020-07-21 19:32:20,733 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:32:38,208 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:38,209 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:47,804 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-21 19:32:48,256 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:53,900 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:56,406 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:58,110 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:58,813 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:58,814 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:59,305 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:59,577 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:59,715 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:59,793 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:33:08,013 INFO L134 CoverageAnalysis]: Checked inductivity of 1663839 backedges. 5578 proven. 40150 refuted. 0 times theorem prover too weak. 1618111 trivial. 0 not checked. [2020-07-21 19:33:08,014 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1333463320] [2020-07-21 19:33:08,014 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:33:08,015 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 27 [2020-07-21 19:33:08,015 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [757739127] [2020-07-21 19:33:08,018 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-21 19:33:08,019 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:33:08,019 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-21 19:33:08,019 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2020-07-21 19:33:08,019 INFO L87 Difference]: Start difference. First operand 66 states and 178 transitions. Second operand 27 states. [2020-07-21 19:33:09,493 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:33:09,493 INFO L93 Difference]: Finished difference Result 122 states and 564 transitions. [2020-07-21 19:33:09,494 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 19:33:09,494 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 5187 [2020-07-21 19:33:09,502 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:33:09,508 INFO L225 Difference]: With dead ends: 122 [2020-07-21 19:33:09,508 INFO L226 Difference]: Without dead ends: 118 [2020-07-21 19:33:09,510 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10385 GetRequests, 10327 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 19:33:09,511 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-07-21 19:33:09,533 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 71. [2020-07-21 19:33:09,533 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-21 19:33:09,536 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 205 transitions. [2020-07-21 19:33:09,536 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 205 transitions. Word has length 5187 [2020-07-21 19:33:09,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:33:09,543 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 205 transitions. [2020-07-21 19:33:09,543 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-21 19:33:09,543 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 205 transitions. [2020-07-21 19:33:09,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4249 [2020-07-21 19:33:09,725 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:33:09,726 INFO L422 BasicCegarLoop]: trace histogram [623, 623, 503, 311, 311, 311, 311, 311, 311, 311, 192, 120, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:33:09,939 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:33:09,940 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:33:09,940 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:33:09,941 INFO L82 PathProgramCache]: Analyzing trace with hash 1497022092, now seen corresponding path program 10 times [2020-07-21 19:33:09,941 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:33:09,942 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1980455215] [2020-07-21 19:33:09,942 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:33:11,579 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:33:11,580 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:33:11,602 INFO L263 TraceCheckSpWp]: Trace formula consists of 9433 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 19:33:11,633 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:33:17,451 INFO L134 CoverageAnalysis]: Checked inductivity of 1094085 backedges. 3939 proven. 33954 refuted. 0 times theorem prover too weak. 1056192 trivial. 0 not checked. [2020-07-21 19:33:17,452 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:33:37,575 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:33:43,519 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:33:43,520 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:33:48,283 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:33:48,283 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:33:50,478 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:33:50,479 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:33:52,085 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:33:52,086 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:33:52,953 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:33:52,953 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:33:53,328 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:33:53,588 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:33:53,589 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:33:53,719 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:33:53,720 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:33:53,804 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:33:59,401 INFO L134 CoverageAnalysis]: Checked inductivity of 1094085 backedges. 3939 proven. 34109 refuted. 0 times theorem prover too weak. 1056037 trivial. 0 not checked. [2020-07-21 19:33:59,402 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1980455215] [2020-07-21 19:33:59,402 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:33:59,403 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 27 [2020-07-21 19:33:59,403 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [878993700] [2020-07-21 19:33:59,406 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-21 19:33:59,406 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:33:59,406 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-21 19:33:59,407 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2020-07-21 19:33:59,407 INFO L87 Difference]: Start difference. First operand 71 states and 205 transitions. Second operand 27 states. [2020-07-21 19:34:01,037 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:34:01,038 INFO L93 Difference]: Finished difference Result 127 states and 612 transitions. [2020-07-21 19:34:01,042 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 19:34:01,042 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 4248 [2020-07-21 19:34:01,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:34:01,049 INFO L225 Difference]: With dead ends: 127 [2020-07-21 19:34:01,049 INFO L226 Difference]: Without dead ends: 123 [2020-07-21 19:34:01,050 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8506 GetRequests, 8448 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 19:34:01,051 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2020-07-21 19:34:01,071 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 71. [2020-07-21 19:34:01,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-21 19:34:01,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 205 transitions. [2020-07-21 19:34:01,074 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 205 transitions. Word has length 4248 [2020-07-21 19:34:01,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:34:01,077 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 205 transitions. [2020-07-21 19:34:01,077 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-21 19:34:01,078 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 205 transitions. [2020-07-21 19:34:01,264 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4720 [2020-07-21 19:34:01,264 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:34:01,266 INFO L422 BasicCegarLoop]: trace histogram [725, 725, 363, 362, 362, 362, 362, 362, 362, 362, 362, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:34:01,479 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:34:01,480 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:34:01,480 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:34:01,482 INFO L82 PathProgramCache]: Analyzing trace with hash 1960561563, now seen corresponding path program 11 times [2020-07-21 19:34:01,483 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:34:01,483 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [202376107] [2020-07-21 19:34:01,483 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:34:03,314 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:34:03,314 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:34:03,341 INFO L263 TraceCheckSpWp]: Trace formula consists of 10528 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-21 19:34:03,375 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:34:10,215 INFO L134 CoverageAnalysis]: Checked inductivity of 1376505 backedges. 5268 proven. 40002 refuted. 0 times theorem prover too weak. 1331235 trivial. 0 not checked. [2020-07-21 19:34:10,215 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:34:32,939 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:42,677 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:50,831 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:50,832 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:54,464 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:54,465 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:56,734 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-21 19:34:57,066 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:58,673 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:58,674 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:59,551 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:59,552 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:35:00,049 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:35:00,396 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:35:00,397 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:35:00,571 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:35:00,678 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:35:08,547 INFO L134 CoverageAnalysis]: Checked inductivity of 1376505 backedges. 5268 proven. 40178 refuted. 0 times theorem prover too weak. 1331059 trivial. 0 not checked. [2020-07-21 19:35:08,548 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [202376107] [2020-07-21 19:35:08,548 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:35:08,549 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 27] total 29 [2020-07-21 19:35:08,549 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [45533228] [2020-07-21 19:35:08,553 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 19:35:08,553 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:35:08,554 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 19:35:08,554 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2020-07-21 19:35:08,554 INFO L87 Difference]: Start difference. First operand 71 states and 205 transitions. Second operand 29 states. [2020-07-21 19:35:10,589 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:35:10,589 INFO L93 Difference]: Finished difference Result 132 states and 662 transitions. [2020-07-21 19:35:10,592 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 19:35:10,592 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 4719 [2020-07-21 19:35:10,596 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:35:10,603 INFO L225 Difference]: With dead ends: 132 [2020-07-21 19:35:10,603 INFO L226 Difference]: Without dead ends: 128 [2020-07-21 19:35:10,605 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9450 GetRequests, 9387 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640 [2020-07-21 19:35:10,605 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2020-07-21 19:35:10,628 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 76. [2020-07-21 19:35:10,629 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-21 19:35:10,631 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 234 transitions. [2020-07-21 19:35:10,632 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 234 transitions. Word has length 4719 [2020-07-21 19:35:10,635 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:35:10,636 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 234 transitions. [2020-07-21 19:35:10,636 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 19:35:10,636 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 234 transitions. [2020-07-21 19:35:10,985 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7351 [2020-07-21 19:35:10,985 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:35:10,988 INFO L422 BasicCegarLoop]: trace histogram [1079, 1079, 869, 539, 539, 539, 539, 539, 539, 539, 330, 210, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:35:11,188 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:35:11,189 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:35:11,189 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:35:11,192 INFO L82 PathProgramCache]: Analyzing trace with hash 1542131908, now seen corresponding path program 11 times [2020-07-21 19:35:11,192 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:35:11,193 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [464183895] [2020-07-21 19:35:11,193 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:35:13,952 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:35:13,953 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:35:14,001 INFO L263 TraceCheckSpWp]: Trace formula consists of 16321 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-21 19:35:14,116 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:35:30,660 INFO L134 CoverageAnalysis]: Checked inductivity of 3283434 backedges. 7000 proven. 65225 refuted. 0 times theorem prover too weak. 3211209 trivial. 0 not checked. [2020-07-21 19:35:30,660 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:35:38,525 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2020-07-21 19:35:38,637 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 84 [2020-07-21 19:36:18,348 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-21 19:36:18,472 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-21 19:36:18,602 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-21 19:36:18,726 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-21 19:36:18,869 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 78 [2020-07-21 19:36:18,989 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 75 [2020-07-21 19:36:19,104 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2020-07-21 19:36:19,217 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-21 19:36:19,319 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 19:36:19,962 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:36:19,962 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:36:37,054 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:36:46,491 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:36:46,491 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:36:54,491 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-21 19:36:54,884 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:36:54,885 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:36:57,990 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:36:57,990 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:00,355 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:00,355 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:01,424 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:02,286 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:02,682 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:02,683 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:02,910 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:02,910 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:03,046 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:19,572 INFO L134 CoverageAnalysis]: Checked inductivity of 3283434 backedges. 7000 proven. 65412 refuted. 0 times theorem prover too weak. 3211022 trivial. 0 not checked. [2020-07-21 19:37:19,572 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [464183895] [2020-07-21 19:37:19,572 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:37:19,574 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 27] total 29 [2020-07-21 19:37:19,574 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [688505260] [2020-07-21 19:37:19,580 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 19:37:19,580 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:37:19,580 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 19:37:19,581 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2020-07-21 19:37:19,581 INFO L87 Difference]: Start difference. First operand 76 states and 234 transitions. Second operand 29 states. [2020-07-21 19:37:21,944 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:37:21,944 INFO L93 Difference]: Finished difference Result 137 states and 714 transitions. [2020-07-21 19:37:21,946 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 19:37:21,947 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 7350 [2020-07-21 19:37:21,954 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:37:21,959 INFO L225 Difference]: With dead ends: 137 [2020-07-21 19:37:21,959 INFO L226 Difference]: Without dead ends: 133 [2020-07-21 19:37:21,961 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14711 GetRequests, 14648 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640 [2020-07-21 19:37:21,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2020-07-21 19:37:21,986 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 76. [2020-07-21 19:37:21,986 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-21 19:37:21,988 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 234 transitions. [2020-07-21 19:37:21,989 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 234 transitions. Word has length 7350 [2020-07-21 19:37:21,993 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:37:21,993 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 234 transitions. [2020-07-21 19:37:21,994 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 19:37:21,994 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 234 transitions. [2020-07-21 19:37:24,517 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21256 [2020-07-21 19:37:24,517 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:37:24,524 INFO L422 BasicCegarLoop]: trace histogram [3269, 3269, 1635, 1634, 1634, 1634, 1634, 1634, 1634, 1634, 1634, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:37:24,725 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:37:24,725 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:37:24,726 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:37:24,731 INFO L82 PathProgramCache]: Analyzing trace with hash -765912721, now seen corresponding path program 12 times [2020-07-21 19:37:24,731 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:37:24,731 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1127611773] [2020-07-21 19:37:24,732 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:37:32,667 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:37:32,667 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:37:32,861 INFO L263 TraceCheckSpWp]: Trace formula consists of 47416 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-21 19:37:33,048 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:39:59,099 INFO L134 CoverageAnalysis]: Checked inductivity of 28036989 backedges. 20894 proven. 203764 refuted. 0 times theorem prover too weak. 27812331 trivial. 0 not checked. [2020-07-21 19:39:59,100 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:40:03,038 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-21 19:40:03,140 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-21 19:40:05,312 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-21 19:40:05,417 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-21 19:40:05,531 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 19:40:05,642 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 19:40:10,010 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-21 19:40:10,131 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-21 19:40:10,260 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-21 19:40:10,385 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-21 19:40:19,056 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-21 19:40:19,191 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-21 19:40:19,331 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 19:40:19,469 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 19:40:33,323 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-21 19:40:33,466 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-21 19:40:33,621 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-21 19:40:33,773 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-21 19:40:33,925 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 91 [2020-07-21 19:40:34,067 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 88 [2020-07-21 19:40:34,204 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 85 [2020-07-21 19:40:34,332 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 81 [2020-07-21 19:40:34,534 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 74 [2020-07-21 19:40:34,645 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2020-07-21 19:40:34,758 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2020-07-21 19:42:39,735 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-21 19:42:46,376 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-21 19:42:56,497 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:08,841 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 1