/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_10-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 16:35:20,705 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 16:35:20,708 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 16:35:20,732 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 16:35:20,732 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 16:35:20,735 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 16:35:20,737 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 16:35:20,752 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 16:35:20,754 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 16:35:20,755 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 16:35:20,756 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 16:35:20,757 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 16:35:20,757 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 16:35:20,758 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 16:35:20,760 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 16:35:20,761 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 16:35:20,761 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 16:35:20,762 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 16:35:20,764 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 16:35:20,766 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 16:35:20,768 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 16:35:20,769 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 16:35:20,770 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 16:35:20,771 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 16:35:20,774 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 16:35:20,781 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 16:35:20,782 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 16:35:20,783 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 16:35:20,784 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 16:35:20,800 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 16:35:20,800 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 16:35:20,801 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 16:35:20,802 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 16:35:20,802 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 16:35:20,802 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 16:35:20,802 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 16:35:20,803 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 16:35:20,803 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 16:35:20,803 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 16:35:20,803 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 16:35:20,803 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 16:35:20,803 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 16:35:20,804 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 16:35:20,804 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 16:35:20,804 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 16:35:20,804 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 16:35:20,804 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 16:35:20,805 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 16:35:20,805 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 16:35:20,805 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 16:35:20,805 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 16:35:20,806 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 16:35:20,806 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 16:35:20,806 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 16:35:20,806 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 16:35:20,806 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:35:20,807 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 16:35:20,807 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 16:35:20,807 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_VARIABLES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 16:35:21,105 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 16:35:21,131 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 16:35:21,135 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 16:35:21,137 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 16:35:21,137 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 16:35:21,138 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_10-2.c [2020-07-20 16:35:21,234 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2ce5e5e09/cb50192acf3048ddb6329520af8981d2/FLAG5dd63209f [2020-07-20 16:35:21,728 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 16:35:21,732 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_10-2.c [2020-07-20 16:35:21,744 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2ce5e5e09/cb50192acf3048ddb6329520af8981d2/FLAG5dd63209f [2020-07-20 16:35:22,075 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2ce5e5e09/cb50192acf3048ddb6329520af8981d2 [2020-07-20 16:35:22,088 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 16:35:22,091 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 16:35:22,093 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 16:35:22,093 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 16:35:22,097 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 16:35:22,098 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 04:35:22" (1/1) ... [2020-07-20 16:35:22,102 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2fd78546 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:35:22, skipping insertion in model container [2020-07-20 16:35:22,102 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 04:35:22" (1/1) ... [2020-07-20 16:35:22,111 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 16:35:22,129 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 16:35:22,299 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 16:35:22,304 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 16:35:22,321 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 16:35:22,338 INFO L208 MainTranslator]: Completed translation [2020-07-20 16:35:22,338 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:35:22 WrapperNode [2020-07-20 16:35:22,339 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 16:35:22,340 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 16:35:22,340 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 16:35:22,340 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 16:35:22,356 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:35:22" (1/1) ... [2020-07-20 16:35:22,357 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:35:22" (1/1) ... [2020-07-20 16:35:22,363 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:35:22" (1/1) ... [2020-07-20 16:35:22,363 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:35:22" (1/1) ... [2020-07-20 16:35:22,368 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:35:22" (1/1) ... [2020-07-20 16:35:22,370 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:35:22" (1/1) ... [2020-07-20 16:35:22,371 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:35:22" (1/1) ... [2020-07-20 16:35:22,373 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 16:35:22,373 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 16:35:22,374 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 16:35:22,374 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 16:35:22,375 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:35:22" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 16:35:22,535 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 16:35:22,535 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 16:35:22,535 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo [2020-07-20 16:35:22,536 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 16:35:22,536 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 16:35:22,536 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 16:35:22,536 INFO L130 BoogieDeclarations]: Found specification of procedure fibo [2020-07-20 16:35:22,536 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 16:35:22,536 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 16:35:22,537 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 16:35:22,731 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 16:35:22,732 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 16:35:22,736 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 04:35:22 BoogieIcfgContainer [2020-07-20 16:35:22,737 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 16:35:22,738 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 16:35:22,738 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 16:35:22,742 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 16:35:22,743 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 04:35:22" (1/3) ... [2020-07-20 16:35:22,744 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@200209c7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 04:35:22, skipping insertion in model container [2020-07-20 16:35:22,744 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:35:22" (2/3) ... [2020-07-20 16:35:22,745 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@200209c7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 04:35:22, skipping insertion in model container [2020-07-20 16:35:22,745 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 04:35:22" (3/3) ... [2020-07-20 16:35:22,747 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_10-2.c [2020-07-20 16:35:22,760 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 16:35:22,769 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 16:35:22,789 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 16:35:22,850 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 16:35:22,850 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 16:35:22,850 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 16:35:22,850 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 16:35:22,851 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 16:35:22,851 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 16:35:22,851 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 16:35:22,852 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 16:35:22,884 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2020-07-20 16:35:22,900 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 16:35:22,900 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:35:22,902 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:35:22,903 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:35:22,912 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:35:22,913 INFO L82 PathProgramCache]: Analyzing trace with hash 537028541, now seen corresponding path program 1 times [2020-07-20 16:35:22,924 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:35:22,925 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [176783536] [2020-07-20 16:35:22,926 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:35:22,997 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:35:22,997 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:35:23,000 INFO L263 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 16:35:23,007 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:35:23,107 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 16:35:23,108 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 16:35:23,109 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [176783536] [2020-07-20 16:35:23,110 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 16:35:23,110 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 16:35:23,112 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1063175740] [2020-07-20 16:35:23,118 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 16:35:23,118 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:35:23,130 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 16:35:23,131 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 16:35:23,134 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 5 states. [2020-07-20 16:35:23,259 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:35:23,259 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2020-07-20 16:35:23,260 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 16:35:23,262 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-20 16:35:23,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:35:23,275 INFO L225 Difference]: With dead ends: 35 [2020-07-20 16:35:23,276 INFO L226 Difference]: Without dead ends: 21 [2020-07-20 16:35:23,280 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 16:35:23,302 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-20 16:35:23,332 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-20 16:35:23,334 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-20 16:35:23,335 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-20 16:35:23,338 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2020-07-20 16:35:23,338 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:35:23,338 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-20 16:35:23,339 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 16:35:23,339 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-20 16:35:23,342 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-20 16:35:23,342 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:35:23,342 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:35:23,557 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:35:23,558 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:35:23,558 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:35:23,559 INFO L82 PathProgramCache]: Analyzing trace with hash 179123823, now seen corresponding path program 1 times [2020-07-20 16:35:23,559 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:35:23,560 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2006015957] [2020-07-20 16:35:23,560 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:35:23,589 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:35:23,590 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:35:23,591 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 16:35:23,593 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:35:23,630 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 16:35:23,630 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 16:35:23,631 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2006015957] [2020-07-20 16:35:23,631 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 16:35:23,631 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 16:35:23,632 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1361514082] [2020-07-20 16:35:23,634 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 16:35:23,634 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:35:23,635 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 16:35:23,635 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 16:35:23,635 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 5 states. [2020-07-20 16:35:23,700 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:35:23,701 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-07-20 16:35:23,702 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 16:35:23,702 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-20 16:35:23,702 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:35:23,704 INFO L225 Difference]: With dead ends: 27 [2020-07-20 16:35:23,704 INFO L226 Difference]: Without dead ends: 23 [2020-07-20 16:35:23,705 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 16:35:23,706 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-20 16:35:23,712 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2020-07-20 16:35:23,713 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-20 16:35:23,714 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-20 16:35:23,714 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 14 [2020-07-20 16:35:23,715 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:35:23,715 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-20 16:35:23,715 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 16:35:23,715 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-20 16:35:23,717 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 16:35:23,717 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:35:23,717 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:35:23,931 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:35:23,932 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:35:23,932 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:35:23,933 INFO L82 PathProgramCache]: Analyzing trace with hash 806022394, now seen corresponding path program 1 times [2020-07-20 16:35:23,933 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:35:23,934 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1089128287] [2020-07-20 16:35:23,935 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:35:23,972 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:35:23,972 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:35:23,973 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 16:35:23,976 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:35:24,036 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 16:35:24,037 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:35:24,230 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:24,281 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-20 16:35:24,282 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1089128287] [2020-07-20 16:35:24,283 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:35:24,283 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-20 16:35:24,283 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2125228357] [2020-07-20 16:35:24,284 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 16:35:24,284 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:35:24,284 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 16:35:24,285 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-20 16:35:24,285 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 9 states. [2020-07-20 16:35:24,409 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:35:24,410 INFO L93 Difference]: Finished difference Result 32 states and 42 transitions. [2020-07-20 16:35:24,410 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 16:35:24,410 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-07-20 16:35:24,411 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:35:24,413 INFO L225 Difference]: With dead ends: 32 [2020-07-20 16:35:24,413 INFO L226 Difference]: Without dead ends: 28 [2020-07-20 16:35:24,414 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 41 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-20 16:35:24,414 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-20 16:35:24,421 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-07-20 16:35:24,422 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-20 16:35:24,423 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-20 16:35:24,424 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 26 [2020-07-20 16:35:24,424 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:35:24,424 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-20 16:35:24,424 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 16:35:24,424 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-20 16:35:24,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 16:35:24,426 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:35:24,427 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:35:24,639 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:35:24,640 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:35:24,640 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:35:24,641 INFO L82 PathProgramCache]: Analyzing trace with hash -983862936, now seen corresponding path program 1 times [2020-07-20 16:35:24,641 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:35:24,642 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1220296253] [2020-07-20 16:35:24,642 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:35:24,674 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:35:24,674 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:35:24,675 INFO L263 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 16:35:24,677 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:35:24,732 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-20 16:35:24,732 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:35:24,897 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:24,952 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-20 16:35:24,953 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1220296253] [2020-07-20 16:35:24,953 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:35:24,953 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-20 16:35:24,953 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [498862349] [2020-07-20 16:35:24,954 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 16:35:24,954 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:35:24,955 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 16:35:24,955 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-20 16:35:24,955 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 9 states. [2020-07-20 16:35:25,061 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:35:25,061 INFO L93 Difference]: Finished difference Result 37 states and 54 transitions. [2020-07-20 16:35:25,062 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 16:35:25,062 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2020-07-20 16:35:25,063 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:35:25,064 INFO L225 Difference]: With dead ends: 37 [2020-07-20 16:35:25,065 INFO L226 Difference]: Without dead ends: 33 [2020-07-20 16:35:25,066 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 44 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-20 16:35:25,066 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-20 16:35:25,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 26. [2020-07-20 16:35:25,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-20 16:35:25,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-20 16:35:25,075 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 27 [2020-07-20 16:35:25,075 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:35:25,075 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-20 16:35:25,075 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 16:35:25,076 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-20 16:35:25,077 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-20 16:35:25,077 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:35:25,078 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:35:25,286 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:35:25,287 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:35:25,287 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:35:25,288 INFO L82 PathProgramCache]: Analyzing trace with hash -2027372739, now seen corresponding path program 2 times [2020-07-20 16:35:25,288 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:35:25,288 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1124471047] [2020-07-20 16:35:25,289 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:35:25,326 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:35:25,326 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:35:25,327 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 16:35:25,332 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:35:25,404 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 21 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-20 16:35:25,404 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:35:25,713 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:25,715 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:25,794 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:25,796 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:25,838 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 26 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-20 16:35:25,838 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1124471047] [2020-07-20 16:35:25,839 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:35:25,839 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-20 16:35:25,839 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [992323383] [2020-07-20 16:35:25,840 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 16:35:25,840 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:35:25,841 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 16:35:25,841 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-20 16:35:25,841 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 11 states. [2020-07-20 16:35:26,007 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:35:26,008 INFO L93 Difference]: Finished difference Result 42 states and 68 transitions. [2020-07-20 16:35:26,008 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 16:35:26,008 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 39 [2020-07-20 16:35:26,009 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:35:26,010 INFO L225 Difference]: With dead ends: 42 [2020-07-20 16:35:26,011 INFO L226 Difference]: Without dead ends: 38 [2020-07-20 16:35:26,012 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 64 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-20 16:35:26,012 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-20 16:35:26,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 31. [2020-07-20 16:35:26,021 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-20 16:35:26,022 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-20 16:35:26,023 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 39 [2020-07-20 16:35:26,023 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:35:26,024 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-20 16:35:26,024 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 16:35:26,024 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-20 16:35:26,026 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-20 16:35:26,026 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:35:26,026 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:35:26,239 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:35:26,241 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:35:26,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:35:26,241 INFO L82 PathProgramCache]: Analyzing trace with hash -1111873851, now seen corresponding path program 2 times [2020-07-20 16:35:26,242 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:35:26,242 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1582628625] [2020-07-20 16:35:26,243 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:35:26,280 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:35:26,280 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:35:26,281 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 16:35:26,284 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:35:26,330 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 24 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-07-20 16:35:26,330 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:35:26,570 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:26,617 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:26,618 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:26,649 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 31 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-20 16:35:26,650 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1582628625] [2020-07-20 16:35:26,650 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:35:26,650 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-20 16:35:26,650 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1133238331] [2020-07-20 16:35:26,651 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 16:35:26,651 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:35:26,652 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 16:35:26,652 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-20 16:35:26,652 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 11 states. [2020-07-20 16:35:26,805 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:35:26,805 INFO L93 Difference]: Finished difference Result 47 states and 84 transitions. [2020-07-20 16:35:26,805 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 16:35:26,806 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 41 [2020-07-20 16:35:26,806 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:35:26,808 INFO L225 Difference]: With dead ends: 47 [2020-07-20 16:35:26,812 INFO L226 Difference]: Without dead ends: 43 [2020-07-20 16:35:26,813 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 68 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-20 16:35:26,814 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-07-20 16:35:26,832 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 31. [2020-07-20 16:35:26,832 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-20 16:35:26,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-20 16:35:26,834 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 41 [2020-07-20 16:35:26,834 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:35:26,835 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-20 16:35:26,835 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 16:35:26,835 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-20 16:35:26,837 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-07-20 16:35:26,837 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:35:26,838 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 5, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:35:27,044 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:35:27,046 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:35:27,046 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:35:27,047 INFO L82 PathProgramCache]: Analyzing trace with hash -767819153, now seen corresponding path program 3 times [2020-07-20 16:35:27,047 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:35:27,047 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1909879845] [2020-07-20 16:35:27,048 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:35:27,103 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:35:27,104 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:35:27,105 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 16:35:27,108 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:35:27,178 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 79 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-07-20 16:35:27,179 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:35:27,599 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:27,707 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:27,708 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:27,763 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:27,768 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:27,820 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 91 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2020-07-20 16:35:27,821 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1909879845] [2020-07-20 16:35:27,821 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:35:27,821 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-20 16:35:27,822 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1251515260] [2020-07-20 16:35:27,826 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 16:35:27,827 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:35:27,827 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 16:35:27,827 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-20 16:35:27,828 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 13 states. [2020-07-20 16:35:28,031 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:35:28,032 INFO L93 Difference]: Finished difference Result 52 states and 102 transitions. [2020-07-20 16:35:28,032 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 16:35:28,032 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 65 [2020-07-20 16:35:28,033 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:35:28,035 INFO L225 Difference]: With dead ends: 52 [2020-07-20 16:35:28,035 INFO L226 Difference]: Without dead ends: 48 [2020-07-20 16:35:28,036 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 111 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-20 16:35:28,037 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-20 16:35:28,046 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 36. [2020-07-20 16:35:28,047 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-20 16:35:28,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-20 16:35:28,049 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 65 [2020-07-20 16:35:28,049 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:35:28,049 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-20 16:35:28,050 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 16:35:28,050 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-20 16:35:28,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-07-20 16:35:28,052 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:35:28,053 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 11, 6, 6, 6, 6, 6, 6, 6, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:35:28,257 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:35:28,260 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:35:28,260 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:35:28,260 INFO L82 PathProgramCache]: Analyzing trace with hash 1474757101, now seen corresponding path program 3 times [2020-07-20 16:35:28,261 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:35:28,261 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [762710828] [2020-07-20 16:35:28,261 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:35:28,314 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:35:28,314 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:35:28,315 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 16:35:28,320 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:35:28,468 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 115 proven. 171 refuted. 0 times theorem prover too weak. 141 trivial. 0 not checked. [2020-07-20 16:35:28,469 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:35:29,196 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:29,286 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:29,345 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:29,648 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:29,648 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:29,698 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:29,753 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 115 proven. 193 refuted. 0 times theorem prover too weak. 119 trivial. 0 not checked. [2020-07-20 16:35:29,754 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [762710828] [2020-07-20 16:35:29,754 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:35:29,754 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 21 [2020-07-20 16:35:29,755 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [722838641] [2020-07-20 16:35:29,755 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 16:35:29,756 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:35:29,756 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 16:35:29,756 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=344, Unknown=0, NotChecked=0, Total=420 [2020-07-20 16:35:29,757 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 21 states. [2020-07-20 16:35:30,377 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:35:30,378 INFO L93 Difference]: Finished difference Result 94 states and 184 transitions. [2020-07-20 16:35:30,379 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-07-20 16:35:30,379 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 96 [2020-07-20 16:35:30,379 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:35:30,381 INFO L225 Difference]: With dead ends: 94 [2020-07-20 16:35:30,381 INFO L226 Difference]: Without dead ends: 64 [2020-07-20 16:35:30,390 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 212 GetRequests, 164 SyntacticMatches, 13 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 232 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=351, Invalid=981, Unknown=0, NotChecked=0, Total=1332 [2020-07-20 16:35:30,391 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-07-20 16:35:30,409 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 61. [2020-07-20 16:35:30,410 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-20 16:35:30,411 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 77 transitions. [2020-07-20 16:35:30,416 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 77 transitions. Word has length 96 [2020-07-20 16:35:30,416 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:35:30,417 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 77 transitions. [2020-07-20 16:35:30,417 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 16:35:30,417 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 77 transitions. [2020-07-20 16:35:30,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-07-20 16:35:30,419 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:35:30,419 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 7, 4, 4, 4, 4, 4, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:35:30,633 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:35:30,634 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:35:30,635 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:35:30,635 INFO L82 PathProgramCache]: Analyzing trace with hash 2001184551, now seen corresponding path program 4 times [2020-07-20 16:35:30,636 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:35:30,636 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1859988813] [2020-07-20 16:35:30,637 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:35:30,692 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:35:30,692 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:35:30,693 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 16:35:30,695 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:35:30,753 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 17 proven. 88 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2020-07-20 16:35:30,753 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:35:31,165 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:31,253 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:31,299 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:31,334 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 17 proven. 103 refuted. 0 times theorem prover too weak. 69 trivial. 0 not checked. [2020-07-20 16:35:31,335 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1859988813] [2020-07-20 16:35:31,335 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:35:31,335 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-20 16:35:31,336 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [440710149] [2020-07-20 16:35:31,336 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 16:35:31,336 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:35:31,337 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 16:35:31,337 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-20 16:35:31,337 INFO L87 Difference]: Start difference. First operand 61 states and 77 transitions. Second operand 13 states. [2020-07-20 16:35:31,477 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:35:31,477 INFO L93 Difference]: Finished difference Result 65 states and 80 transitions. [2020-07-20 16:35:31,478 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 16:35:31,478 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 68 [2020-07-20 16:35:31,479 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:35:31,480 INFO L225 Difference]: With dead ends: 65 [2020-07-20 16:35:31,480 INFO L226 Difference]: Without dead ends: 61 [2020-07-20 16:35:31,482 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 116 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-20 16:35:31,482 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-07-20 16:35:31,492 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2020-07-20 16:35:31,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-20 16:35:31,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 76 transitions. [2020-07-20 16:35:31,494 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 76 transitions. Word has length 68 [2020-07-20 16:35:31,494 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:35:31,494 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 76 transitions. [2020-07-20 16:35:31,494 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 16:35:31,494 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 76 transitions. [2020-07-20 16:35:31,496 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-07-20 16:35:31,496 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:35:31,497 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 12, 7, 7, 7, 7, 7, 7, 7, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:35:31,703 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:35:31,704 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:35:31,704 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:35:31,705 INFO L82 PathProgramCache]: Analyzing trace with hash 1200034344, now seen corresponding path program 5 times [2020-07-20 16:35:31,705 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:35:31,706 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [973685807] [2020-07-20 16:35:31,706 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:35:31,776 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:35:31,776 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:35:31,778 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 16:35:31,781 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:35:31,860 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 42 proven. 229 refuted. 0 times theorem prover too weak. 299 trivial. 0 not checked. [2020-07-20 16:35:31,860 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:35:32,478 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:32,652 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:32,654 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:32,742 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:32,787 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:32,830 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 42 proven. 255 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2020-07-20 16:35:32,830 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [973685807] [2020-07-20 16:35:32,831 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:35:32,831 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-20 16:35:32,831 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2104261467] [2020-07-20 16:35:32,832 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 16:35:32,832 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:35:32,832 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 16:35:32,832 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-20 16:35:32,833 INFO L87 Difference]: Start difference. First operand 61 states and 76 transitions. Second operand 15 states. [2020-07-20 16:35:32,999 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:35:32,999 INFO L93 Difference]: Finished difference Result 68 states and 84 transitions. [2020-07-20 16:35:33,000 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 16:35:33,000 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 109 [2020-07-20 16:35:33,001 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:35:33,002 INFO L225 Difference]: With dead ends: 68 [2020-07-20 16:35:33,002 INFO L226 Difference]: Without dead ends: 64 [2020-07-20 16:35:33,004 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 222 GetRequests, 194 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2020-07-20 16:35:33,004 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-07-20 16:35:33,011 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2020-07-20 16:35:33,012 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-07-20 16:35:33,013 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 80 transitions. [2020-07-20 16:35:33,013 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 80 transitions. Word has length 109 [2020-07-20 16:35:33,014 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:35:33,014 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 80 transitions. [2020-07-20 16:35:33,014 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 16:35:33,014 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 80 transitions. [2020-07-20 16:35:33,017 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 219 [2020-07-20 16:35:33,017 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:35:33,018 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 25, 15, 15, 15, 15, 15, 15, 15, 10, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:35:33,223 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:35:33,224 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:35:33,225 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:35:33,225 INFO L82 PathProgramCache]: Analyzing trace with hash 706081956, now seen corresponding path program 6 times [2020-07-20 16:35:33,225 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:35:33,226 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [572888440] [2020-07-20 16:35:33,226 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:35:33,335 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:35:33,335 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:35:33,337 INFO L263 TraceCheckSpWp]: Trace formula consists of 331 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 16:35:33,343 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:35:33,517 INFO L134 CoverageAnalysis]: Checked inductivity of 2580 backedges. 463 proven. 839 refuted. 0 times theorem prover too weak. 1278 trivial. 0 not checked. [2020-07-20 16:35:33,518 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:35:34,788 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:34,956 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:35,063 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:35,124 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:35,125 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:35,787 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:35,788 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:35,958 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:36,064 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:36,133 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:36,134 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:36,198 INFO L134 CoverageAnalysis]: Checked inductivity of 2580 backedges. 463 proven. 891 refuted. 0 times theorem prover too weak. 1226 trivial. 0 not checked. [2020-07-20 16:35:36,199 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [572888440] [2020-07-20 16:35:36,199 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:35:36,199 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 23] total 25 [2020-07-20 16:35:36,200 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [183649059] [2020-07-20 16:35:36,201 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 16:35:36,201 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:35:36,201 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 16:35:36,203 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=493, Unknown=0, NotChecked=0, Total=600 [2020-07-20 16:35:36,204 INFO L87 Difference]: Start difference. First operand 64 states and 80 transitions. Second operand 25 states. [2020-07-20 16:35:37,024 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:35:37,024 INFO L93 Difference]: Finished difference Result 144 states and 221 transitions. [2020-07-20 16:35:37,025 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-07-20 16:35:37,025 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 218 [2020-07-20 16:35:37,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:35:37,029 INFO L225 Difference]: With dead ends: 144 [2020-07-20 16:35:37,029 INFO L226 Difference]: Without dead ends: 88 [2020-07-20 16:35:37,031 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 456 GetRequests, 391 SyntacticMatches, 21 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 422 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=539, Invalid=1531, Unknown=0, NotChecked=0, Total=2070 [2020-07-20 16:35:37,031 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-07-20 16:35:37,041 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 78. [2020-07-20 16:35:37,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2020-07-20 16:35:37,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 102 transitions. [2020-07-20 16:35:37,043 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 102 transitions. Word has length 218 [2020-07-20 16:35:37,044 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:35:37,044 INFO L479 AbstractCegarLoop]: Abstraction has 78 states and 102 transitions. [2020-07-20 16:35:37,044 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 16:35:37,044 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 102 transitions. [2020-07-20 16:35:37,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2020-07-20 16:35:37,047 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:35:37,047 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 20, 12, 12, 12, 12, 12, 12, 12, 8, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:35:37,261 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:35:37,262 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:35:37,263 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:35:37,263 INFO L82 PathProgramCache]: Analyzing trace with hash 259499213, now seen corresponding path program 7 times [2020-07-20 16:35:37,263 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:35:37,264 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [768123036] [2020-07-20 16:35:37,264 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:35:37,378 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:35:37,379 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:35:37,381 INFO L263 TraceCheckSpWp]: Trace formula consists of 345 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 16:35:37,385 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:35:37,470 INFO L134 CoverageAnalysis]: Checked inductivity of 1654 backedges. 93 proven. 533 refuted. 0 times theorem prover too weak. 1028 trivial. 0 not checked. [2020-07-20 16:35:37,471 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:35:38,457 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:38,459 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:38,733 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:38,900 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:38,901 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:38,988 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:39,036 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:39,092 INFO L134 CoverageAnalysis]: Checked inductivity of 1654 backedges. 93 proven. 573 refuted. 0 times theorem prover too weak. 988 trivial. 0 not checked. [2020-07-20 16:35:39,092 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [768123036] [2020-07-20 16:35:39,093 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:35:39,093 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-20 16:35:39,093 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1549772274] [2020-07-20 16:35:39,093 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 16:35:39,094 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:35:39,094 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 16:35:39,094 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-20 16:35:39,094 INFO L87 Difference]: Start difference. First operand 78 states and 102 transitions. Second operand 17 states. [2020-07-20 16:35:39,334 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:35:39,335 INFO L93 Difference]: Finished difference Result 85 states and 111 transitions. [2020-07-20 16:35:39,336 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 16:35:39,336 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 177 [2020-07-20 16:35:39,337 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:35:39,338 INFO L225 Difference]: With dead ends: 85 [2020-07-20 16:35:39,338 INFO L226 Difference]: Without dead ends: 81 [2020-07-20 16:35:39,339 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 359 GetRequests, 326 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2020-07-20 16:35:39,340 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2020-07-20 16:35:39,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 81. [2020-07-20 16:35:39,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-07-20 16:35:39,362 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 107 transitions. [2020-07-20 16:35:39,363 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 107 transitions. Word has length 177 [2020-07-20 16:35:39,363 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:35:39,363 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 107 transitions. [2020-07-20 16:35:39,363 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 16:35:39,364 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 107 transitions. [2020-07-20 16:35:39,367 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 287 [2020-07-20 16:35:39,368 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:35:39,368 INFO L422 BasicCegarLoop]: trace histogram [41, 41, 33, 20, 20, 20, 20, 20, 20, 20, 13, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:35:39,581 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:35:39,582 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:35:39,582 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:35:39,583 INFO L82 PathProgramCache]: Analyzing trace with hash -1425621089, now seen corresponding path program 8 times [2020-07-20 16:35:39,583 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:35:39,583 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1649758681] [2020-07-20 16:35:39,584 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:35:39,747 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:35:39,748 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:35:39,750 INFO L263 TraceCheckSpWp]: Trace formula consists of 554 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 16:35:39,754 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:35:39,888 INFO L134 CoverageAnalysis]: Checked inductivity of 4568 backedges. 189 proven. 1130 refuted. 0 times theorem prover too weak. 3249 trivial. 0 not checked. [2020-07-20 16:35:39,889 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:35:41,456 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:41,457 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:41,891 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:42,172 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:42,173 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:42,348 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:42,438 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:42,490 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:42,592 INFO L134 CoverageAnalysis]: Checked inductivity of 4568 backedges. 189 proven. 1187 refuted. 0 times theorem prover too weak. 3192 trivial. 0 not checked. [2020-07-20 16:35:42,592 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1649758681] [2020-07-20 16:35:42,592 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:35:42,593 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-20 16:35:42,593 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1226101676] [2020-07-20 16:35:42,594 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 16:35:42,594 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:35:42,594 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 16:35:42,595 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-20 16:35:42,595 INFO L87 Difference]: Start difference. First operand 81 states and 107 transitions. Second operand 19 states. [2020-07-20 16:35:42,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:35:42,885 INFO L93 Difference]: Finished difference Result 90 states and 124 transitions. [2020-07-20 16:35:42,885 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 16:35:42,885 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 286 [2020-07-20 16:35:42,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:35:42,888 INFO L225 Difference]: With dead ends: 90 [2020-07-20 16:35:42,889 INFO L226 Difference]: Without dead ends: 86 [2020-07-20 16:35:42,889 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 578 GetRequests, 540 SyntacticMatches, 14 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=211, Invalid=439, Unknown=0, NotChecked=0, Total=650 [2020-07-20 16:35:42,890 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-07-20 16:35:42,898 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 86. [2020-07-20 16:35:42,898 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2020-07-20 16:35:42,899 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 120 transitions. [2020-07-20 16:35:42,900 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 120 transitions. Word has length 286 [2020-07-20 16:35:42,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:35:42,901 INFO L479 AbstractCegarLoop]: Abstraction has 86 states and 120 transitions. [2020-07-20 16:35:42,901 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 16:35:42,901 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 120 transitions. [2020-07-20 16:35:42,912 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 505 [2020-07-20 16:35:42,912 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:35:42,912 INFO L422 BasicCegarLoop]: trace histogram [73, 73, 59, 36, 36, 36, 36, 36, 36, 36, 23, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:35:43,127 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:35:43,128 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:35:43,128 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:35:43,129 INFO L82 PathProgramCache]: Analyzing trace with hash -350328107, now seen corresponding path program 9 times [2020-07-20 16:35:43,129 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:35:43,130 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2044823170] [2020-07-20 16:35:43,130 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:35:43,334 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:35:43,334 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:35:43,338 INFO L263 TraceCheckSpWp]: Trace formula consists of 754 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-20 16:35:43,348 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:35:43,658 INFO L134 CoverageAnalysis]: Checked inductivity of 14743 backedges. 7742 proven. 1596 refuted. 0 times theorem prover too weak. 5405 trivial. 0 not checked. [2020-07-20 16:35:43,658 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:35:46,875 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:47,166 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:47,167 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:47,345 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:47,447 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:47,448 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:47,506 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:47,507 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:48,582 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:48,584 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:48,868 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:48,869 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:49,042 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:49,043 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:49,133 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:49,134 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:49,186 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:49,352 INFO L134 CoverageAnalysis]: Checked inductivity of 14743 backedges. 1220 proven. 3406 refuted. 0 times theorem prover too weak. 10117 trivial. 0 not checked. [2020-07-20 16:35:49,353 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2044823170] [2020-07-20 16:35:49,353 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:35:49,354 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 27] total 29 [2020-07-20 16:35:49,354 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [563902185] [2020-07-20 16:35:49,355 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-20 16:35:49,355 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:35:49,355 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-20 16:35:49,356 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=139, Invalid=673, Unknown=0, NotChecked=0, Total=812 [2020-07-20 16:35:49,356 INFO L87 Difference]: Start difference. First operand 86 states and 120 transitions. Second operand 29 states. [2020-07-20 16:35:50,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:35:50,605 INFO L93 Difference]: Finished difference Result 187 states and 314 transitions. [2020-07-20 16:35:50,605 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-07-20 16:35:50,606 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 504 [2020-07-20 16:35:50,607 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:35:50,609 INFO L225 Difference]: With dead ends: 187 [2020-07-20 16:35:50,609 INFO L226 Difference]: Without dead ends: 109 [2020-07-20 16:35:50,611 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1033 GetRequests, 955 SyntacticMatches, 25 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 652 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=747, Invalid=2223, Unknown=0, NotChecked=0, Total=2970 [2020-07-20 16:35:50,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2020-07-20 16:35:50,621 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 98. [2020-07-20 16:35:50,621 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 98 states. [2020-07-20 16:35:50,622 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 135 transitions. [2020-07-20 16:35:50,623 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 135 transitions. Word has length 504 [2020-07-20 16:35:50,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:35:50,624 INFO L479 AbstractCegarLoop]: Abstraction has 98 states and 135 transitions. [2020-07-20 16:35:50,624 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-20 16:35:50,624 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 135 transitions. [2020-07-20 16:35:50,627 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 464 [2020-07-20 16:35:50,627 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:35:50,628 INFO L422 BasicCegarLoop]: trace histogram [67, 67, 54, 33, 33, 33, 33, 33, 33, 33, 21, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:35:50,842 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:35:50,843 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:35:50,843 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:35:50,844 INFO L82 PathProgramCache]: Analyzing trace with hash -229001048, now seen corresponding path program 10 times [2020-07-20 16:35:50,844 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:35:50,845 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [495972573] [2020-07-20 16:35:50,845 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:35:51,128 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:35:51,128 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:35:51,132 INFO L263 TraceCheckSpWp]: Trace formula consists of 894 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 16:35:51,142 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:35:51,433 INFO L134 CoverageAnalysis]: Checked inductivity of 12387 backedges. 361 proven. 2270 refuted. 0 times theorem prover too weak. 9756 trivial. 0 not checked. [2020-07-20 16:35:51,433 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:35:53,998 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:53,999 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:54,758 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:54,759 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:55,246 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:55,247 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:55,519 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:55,702 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:55,798 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:55,799 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:55,849 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:55,850 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:35:55,973 INFO L134 CoverageAnalysis]: Checked inductivity of 12387 backedges. 361 proven. 2347 refuted. 0 times theorem prover too weak. 9679 trivial. 0 not checked. [2020-07-20 16:35:55,973 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [495972573] [2020-07-20 16:35:55,973 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:35:55,974 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-20 16:35:55,974 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1765663891] [2020-07-20 16:35:55,975 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 16:35:55,975 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:35:55,975 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 16:35:55,976 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-20 16:35:55,976 INFO L87 Difference]: Start difference. First operand 98 states and 135 transitions. Second operand 21 states. [2020-07-20 16:35:56,371 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:35:56,371 INFO L93 Difference]: Finished difference Result 107 states and 153 transitions. [2020-07-20 16:35:56,372 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 16:35:56,372 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 463 [2020-07-20 16:35:56,373 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:35:56,375 INFO L225 Difference]: With dead ends: 107 [2020-07-20 16:35:56,375 INFO L226 Difference]: Without dead ends: 103 [2020-07-20 16:35:56,376 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 933 GetRequests, 890 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2020-07-20 16:35:56,376 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2020-07-20 16:35:56,385 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2020-07-20 16:35:56,385 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-07-20 16:35:56,387 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 149 transitions. [2020-07-20 16:35:56,387 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 149 transitions. Word has length 463 [2020-07-20 16:35:56,389 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:35:56,389 INFO L479 AbstractCegarLoop]: Abstraction has 103 states and 149 transitions. [2020-07-20 16:35:56,389 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 16:35:56,389 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 149 transitions. [2020-07-20 16:35:56,398 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 995 [2020-07-20 16:35:56,399 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:35:56,399 INFO L422 BasicCegarLoop]: trace histogram [145, 145, 117, 72, 72, 72, 72, 72, 72, 72, 45, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:35:56,599 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:35:56,600 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:35:56,600 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:35:56,601 INFO L82 PathProgramCache]: Analyzing trace with hash -928557949, now seen corresponding path program 11 times [2020-07-20 16:35:56,601 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:35:56,602 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [944435847] [2020-07-20 16:35:56,602 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:35:56,907 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 16:35:56,908 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:35:56,911 INFO L263 TraceCheckSpWp]: Trace formula consists of 791 conjuncts, 32 conjunts are in the unsatisfiable core [2020-07-20 16:35:56,926 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:35:57,582 INFO L134 CoverageAnalysis]: Checked inductivity of 58770 backedges. 29376 proven. 4650 refuted. 0 times theorem prover too weak. 24744 trivial. 0 not checked. [2020-07-20 16:35:57,583 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:36:04,037 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:36:04,038 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:36:04,784 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:36:05,289 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:36:05,290 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:36:05,594 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:36:05,779 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:36:05,891 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:36:05,960 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:36:07,673 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:36:07,674 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:36:08,167 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:36:08,168 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:36:08,503 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:36:08,504 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:36:08,693 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:36:08,802 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:36:08,867 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:36:08,867 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:36:09,348 INFO L134 CoverageAnalysis]: Checked inductivity of 58770 backedges. 2815 proven. 9221 refuted. 0 times theorem prover too weak. 46734 trivial. 0 not checked. [2020-07-20 16:36:09,349 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [944435847] [2020-07-20 16:36:09,349 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:36:09,350 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 33] total 37 [2020-07-20 16:36:09,350 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1806391933] [2020-07-20 16:36:09,351 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-07-20 16:36:09,352 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:36:09,352 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-07-20 16:36:09,353 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=208, Invalid=1124, Unknown=0, NotChecked=0, Total=1332 [2020-07-20 16:36:09,353 INFO L87 Difference]: Start difference. First operand 103 states and 149 transitions. Second operand 37 states. [2020-07-20 16:36:11,514 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:36:11,515 INFO L93 Difference]: Finished difference Result 257 states and 498 transitions. [2020-07-20 16:36:11,515 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-07-20 16:36:11,516 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 994 [2020-07-20 16:36:11,517 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:36:11,520 INFO L225 Difference]: With dead ends: 257 [2020-07-20 16:36:11,520 INFO L226 Difference]: Without dead ends: 162 [2020-07-20 16:36:11,524 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2023 GetRequests, 1923 SyntacticMatches, 29 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1244 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1231, Invalid=4025, Unknown=0, NotChecked=0, Total=5256 [2020-07-20 16:36:11,525 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2020-07-20 16:36:11,534 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 129. [2020-07-20 16:36:11,534 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 129 states. [2020-07-20 16:36:11,536 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 186 transitions. [2020-07-20 16:36:11,537 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 186 transitions. Word has length 994 [2020-07-20 16:36:11,538 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:36:11,538 INFO L479 AbstractCegarLoop]: Abstraction has 129 states and 186 transitions. [2020-07-20 16:36:11,538 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-07-20 16:36:11,538 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 186 transitions. [2020-07-20 16:36:11,545 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 750 [2020-07-20 16:36:11,545 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:36:11,545 INFO L422 BasicCegarLoop]: trace histogram [109, 109, 88, 54, 54, 54, 54, 54, 54, 54, 34, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:36:11,746 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:36:11,746 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:36:11,747 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:36:11,748 INFO L82 PathProgramCache]: Analyzing trace with hash -127293739, now seen corresponding path program 12 times [2020-07-20 16:36:11,748 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:36:11,748 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [885534535] [2020-07-20 16:36:11,749 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:36:12,194 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:36:12,194 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:36:12,199 INFO L263 TraceCheckSpWp]: Trace formula consists of 1446 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 16:36:12,211 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:36:12,594 INFO L134 CoverageAnalysis]: Checked inductivity of 33096 backedges. 659 proven. 4380 refuted. 0 times theorem prover too weak. 28057 trivial. 0 not checked. [2020-07-20 16:36:12,594 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:36:16,203 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:36:17,447 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:36:18,266 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:36:18,793 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:36:18,798 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:36:19,122 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:36:19,123 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:36:19,335 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:36:19,433 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:36:19,492 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:36:19,728 INFO L134 CoverageAnalysis]: Checked inductivity of 33096 backedges. 659 proven. 4480 refuted. 0 times theorem prover too weak. 27957 trivial. 0 not checked. [2020-07-20 16:36:19,728 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [885534535] [2020-07-20 16:36:19,729 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:36:19,729 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 22 [2020-07-20 16:36:19,729 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [23832867] [2020-07-20 16:36:19,731 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-20 16:36:19,731 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:36:19,731 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-20 16:36:19,732 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=331, Unknown=0, NotChecked=0, Total=462 [2020-07-20 16:36:19,732 INFO L87 Difference]: Start difference. First operand 129 states and 186 transitions. Second operand 22 states. [2020-07-20 16:36:20,048 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:36:20,049 INFO L93 Difference]: Finished difference Result 136 states and 198 transitions. [2020-07-20 16:36:20,050 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 16:36:20,050 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 749 [2020-07-20 16:36:20,052 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:36:20,054 INFO L225 Difference]: With dead ends: 136 [2020-07-20 16:36:20,055 INFO L226 Difference]: Without dead ends: 132 [2020-07-20 16:36:20,056 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1506 GetRequests, 1458 SyntacticMatches, 19 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 208 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=320, Invalid=610, Unknown=0, NotChecked=0, Total=930 [2020-07-20 16:36:20,056 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2020-07-20 16:36:20,064 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 132. [2020-07-20 16:36:20,064 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 132 states. [2020-07-20 16:36:20,066 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 194 transitions. [2020-07-20 16:36:20,067 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 194 transitions. Word has length 749 [2020-07-20 16:36:20,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:36:20,068 INFO L479 AbstractCegarLoop]: Abstraction has 132 states and 194 transitions. [2020-07-20 16:36:20,068 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-20 16:36:20,068 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 194 transitions. [2020-07-20 16:36:20,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1213 [2020-07-20 16:36:20,082 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:36:20,083 INFO L422 BasicCegarLoop]: trace histogram [177, 177, 143, 88, 88, 88, 88, 88, 88, 88, 55, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:36:20,295 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:36:20,296 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:36:20,296 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:36:20,297 INFO L82 PathProgramCache]: Analyzing trace with hash 452920407, now seen corresponding path program 13 times [2020-07-20 16:36:20,297 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:36:20,298 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1379326426] [2020-07-20 16:36:20,298 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:36:20,961 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 16:36:20,961 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:36:21,001 INFO L263 TraceCheckSpWp]: Trace formula consists of 2692 conjuncts, 711 conjunts are in the unsatisfiable core [2020-07-20 16:36:21,026 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:36:22,724 INFO L134 CoverageAnalysis]: Checked inductivity of 87769 backedges. 0 proven. 28921 refuted. 0 times theorem prover too weak. 58848 trivial. 0 not checked. [2020-07-20 16:36:22,725 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:36:31,794 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 6 [2020-07-20 16:36:47,021 INFO L134 CoverageAnalysis]: Checked inductivity of 87769 backedges. 0 proven. 28921 refuted. 0 times theorem prover too weak. 58848 trivial. 0 not checked. [2020-07-20 16:36:47,021 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1379326426] [2020-07-20 16:36:47,021 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:36:47,022 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31] total 40 [2020-07-20 16:36:47,022 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1090871814] [2020-07-20 16:36:47,023 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-07-20 16:36:47,024 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:36:47,024 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-07-20 16:36:47,024 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=1465, Unknown=0, NotChecked=0, Total=1560 [2020-07-20 16:36:47,025 INFO L87 Difference]: Start difference. First operand 132 states and 194 transitions. Second operand 40 states. [2020-07-20 16:36:48,012 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:36:48,012 INFO L93 Difference]: Finished difference Result 153 states and 240 transitions. [2020-07-20 16:36:48,013 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-07-20 16:36:48,013 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 1212 [2020-07-20 16:36:48,015 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:36:48,017 INFO L225 Difference]: With dead ends: 153 [2020-07-20 16:36:48,017 INFO L226 Difference]: Without dead ends: 149 [2020-07-20 16:36:48,018 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2423 GetRequests, 2339 SyntacticMatches, 46 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 452 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=95, Invalid=1465, Unknown=0, NotChecked=0, Total=1560 [2020-07-20 16:36:48,019 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2020-07-20 16:36:48,028 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 142. [2020-07-20 16:36:48,029 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 142 states. [2020-07-20 16:36:48,030 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 223 transitions. [2020-07-20 16:36:48,031 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 223 transitions. Word has length 1212 [2020-07-20 16:36:48,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:36:48,032 INFO L479 AbstractCegarLoop]: Abstraction has 142 states and 223 transitions. [2020-07-20 16:36:48,032 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-07-20 16:36:48,032 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 223 transitions. [2020-07-20 16:36:48,065 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2207 [2020-07-20 16:36:48,066 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:36:48,066 INFO L422 BasicCegarLoop]: trace histogram [323, 323, 261, 161, 161, 161, 161, 161, 161, 161, 100, 62, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:36:48,267 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:36:48,267 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:36:48,268 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:36:48,269 INFO L82 PathProgramCache]: Analyzing trace with hash 1410440460, now seen corresponding path program 14 times [2020-07-20 16:36:48,269 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:36:48,270 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1955350888] [2020-07-20 16:36:48,270 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:36:49,006 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 16:36:49,007 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:36:49,015 INFO L263 TraceCheckSpWp]: Trace formula consists of 1745 conjuncts, 30 conjunts are in the unsatisfiable core [2020-07-20 16:36:49,043 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:36:51,031 INFO L134 CoverageAnalysis]: Checked inductivity of 293462 backedges. 123819 proven. 3818 refuted. 0 times theorem prover too weak. 165825 trivial. 0 not checked. [2020-07-20 16:36:51,032 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:37:04,469 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:37:04,470 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:37:04,796 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:37:04,998 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:37:05,133 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:37:05,235 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:37:08,061 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:37:08,062 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:37:08,953 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:37:08,954 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:37:09,508 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:37:09,509 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:37:09,860 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:37:10,127 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:37:10,260 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:37:10,331 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:37:12,148 INFO L134 CoverageAnalysis]: Checked inductivity of 293462 backedges. 4185 proven. 23185 refuted. 0 times theorem prover too weak. 266092 trivial. 0 not checked. [2020-07-20 16:37:12,148 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1955350888] [2020-07-20 16:37:12,149 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:37:12,149 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 31] total 33 [2020-07-20 16:37:12,150 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [413073536] [2020-07-20 16:37:12,152 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-07-20 16:37:12,152 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:37:12,153 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-07-20 16:37:12,153 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=183, Invalid=873, Unknown=0, NotChecked=0, Total=1056 [2020-07-20 16:37:12,153 INFO L87 Difference]: Start difference. First operand 142 states and 223 transitions. Second operand 33 states. [2020-07-20 16:37:13,533 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:37:13,534 INFO L93 Difference]: Finished difference Result 290 states and 482 transitions. [2020-07-20 16:37:13,535 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-07-20 16:37:13,535 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 2206 [2020-07-20 16:37:13,535 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:37:13,538 INFO L225 Difference]: With dead ends: 290 [2020-07-20 16:37:13,538 INFO L226 Difference]: Without dead ends: 156 [2020-07-20 16:37:13,540 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4432 GetRequests, 4351 SyntacticMatches, 29 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 683 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=724, Invalid=2138, Unknown=0, NotChecked=0, Total=2862 [2020-07-20 16:37:13,541 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2020-07-20 16:37:13,549 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 122. [2020-07-20 16:37:13,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 122 states. [2020-07-20 16:37:13,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 188 transitions. [2020-07-20 16:37:13,552 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 188 transitions. Word has length 2206 [2020-07-20 16:37:13,552 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:37:13,552 INFO L479 AbstractCegarLoop]: Abstraction has 122 states and 188 transitions. [2020-07-20 16:37:13,553 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-07-20 16:37:13,553 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 188 transitions. [2020-07-20 16:37:13,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1499 [2020-07-20 16:37:13,573 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:37:13,574 INFO L422 BasicCegarLoop]: trace histogram [219, 219, 177, 109, 109, 109, 109, 109, 109, 109, 68, 42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:37:13,788 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:37:13,788 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:37:13,789 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:37:13,789 INFO L82 PathProgramCache]: Analyzing trace with hash 1905168074, now seen corresponding path program 15 times [2020-07-20 16:37:13,789 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:37:13,790 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2035760001] [2020-07-20 16:37:13,790 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:37:14,530 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:37:14,530 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:37:14,537 INFO L263 TraceCheckSpWp]: Trace formula consists of 2239 conjuncts, 38 conjunts are in the unsatisfiable core [2020-07-20 16:37:14,554 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:37:15,938 INFO L134 CoverageAnalysis]: Checked inductivity of 134604 backedges. 7045 proven. 14191 refuted. 0 times theorem prover too weak. 113368 trivial. 0 not checked. [2020-07-20 16:37:15,938 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:37:23,067 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:37:24,531 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:37:24,532 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:37:25,475 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:37:25,475 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:37:26,056 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:37:26,057 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:37:26,411 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:37:26,412 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:37:26,635 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:37:26,636 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:37:26,778 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:37:26,858 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:37:26,858 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:37:31,117 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:37:32,623 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:37:33,592 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:37:33,592 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:37:34,189 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:37:34,190 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:37:34,553 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:37:34,553 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:37:34,780 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:37:34,916 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:37:34,917 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:37:34,998 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:37:34,998 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:37:36,002 INFO L134 CoverageAnalysis]: Checked inductivity of 134604 backedges. 7045 proven. 14391 refuted. 0 times theorem prover too weak. 113168 trivial. 0 not checked. [2020-07-20 16:37:36,002 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2035760001] [2020-07-20 16:37:36,002 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:37:36,003 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 39] total 41 [2020-07-20 16:37:36,003 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1545922760] [2020-07-20 16:37:36,005 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-07-20 16:37:36,005 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:37:36,005 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-07-20 16:37:36,006 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=259, Invalid=1381, Unknown=0, NotChecked=0, Total=1640 [2020-07-20 16:37:36,006 INFO L87 Difference]: Start difference. First operand 122 states and 188 transitions. Second operand 41 states. [2020-07-20 16:37:38,804 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:37:38,805 INFO L93 Difference]: Finished difference Result 275 states and 502 transitions. [2020-07-20 16:37:38,806 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2020-07-20 16:37:38,806 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 1498 [2020-07-20 16:37:38,807 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:37:38,809 INFO L225 Difference]: With dead ends: 275 [2020-07-20 16:37:38,810 INFO L226 Difference]: Without dead ends: 161 [2020-07-20 16:37:38,814 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3036 GetRequests, 2919 SyntacticMatches, 37 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1642 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=1563, Invalid=5079, Unknown=0, NotChecked=0, Total=6642 [2020-07-20 16:37:38,815 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 161 states. [2020-07-20 16:37:38,827 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 161 to 154. [2020-07-20 16:37:38,827 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 154 states. [2020-07-20 16:37:38,829 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 238 transitions. [2020-07-20 16:37:38,829 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 238 transitions. Word has length 1498 [2020-07-20 16:37:38,830 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:37:38,830 INFO L479 AbstractCegarLoop]: Abstraction has 154 states and 238 transitions. [2020-07-20 16:37:38,830 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-07-20 16:37:38,830 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 238 transitions. [2020-07-20 16:37:38,849 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1499 [2020-07-20 16:37:38,849 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:37:38,850 INFO L422 BasicCegarLoop]: trace histogram [219, 219, 177, 109, 109, 109, 109, 109, 109, 109, 68, 42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:37:39,065 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:37:39,065 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:37:39,066 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:37:39,066 INFO L82 PathProgramCache]: Analyzing trace with hash -918806966, now seen corresponding path program 16 times [2020-07-20 16:37:39,066 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:37:39,067 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1862989477] [2020-07-20 16:37:39,067 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:37:39,907 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:37:39,907 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:37:39,915 INFO L263 TraceCheckSpWp]: Trace formula consists of 2239 conjuncts, 34 conjunts are in the unsatisfiable core [2020-07-20 16:37:39,929 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:37:41,330 INFO L134 CoverageAnalysis]: Checked inductivity of 134604 backedges. 62853 proven. 7454 refuted. 0 times theorem prover too weak. 64297 trivial. 0 not checked. [2020-07-20 16:37:41,331 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:37:46,686 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-20 16:37:50,480 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:37:51,123 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:37:51,124 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:37:51,507 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:37:51,508 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:37:51,748 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:37:51,889 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:37:51,973 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:37:56,697 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:37:58,364 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:37:58,365 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:37:59,431 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:37:59,432 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:38:00,090 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:38:00,483 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:38:00,484 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:38:00,734 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:38:00,881 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:38:00,962 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:38:01,881 INFO L134 CoverageAnalysis]: Checked inductivity of 134604 backedges. 6010 proven. 13838 refuted. 0 times theorem prover too weak. 114756 trivial. 0 not checked. [2020-07-20 16:38:01,882 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1862989477] [2020-07-20 16:38:01,882 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:38:01,882 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 35] total 37 [2020-07-20 16:38:01,882 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2128159627] [2020-07-20 16:38:01,884 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-07-20 16:38:01,884 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:38:01,885 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-07-20 16:38:01,885 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=224, Invalid=1108, Unknown=0, NotChecked=0, Total=1332 [2020-07-20 16:38:01,886 INFO L87 Difference]: Start difference. First operand 154 states and 238 transitions. Second operand 37 states. [2020-07-20 16:38:03,704 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:38:03,705 INFO L93 Difference]: Finished difference Result 318 states and 509 transitions. [2020-07-20 16:38:03,706 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-07-20 16:38:03,706 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 1498 [2020-07-20 16:38:03,708 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:38:03,711 INFO L225 Difference]: With dead ends: 318 [2020-07-20 16:38:03,711 INFO L226 Difference]: Without dead ends: 172 [2020-07-20 16:38:03,714 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3019 GetRequests, 2927 SyntacticMatches, 33 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 909 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=909, Invalid=2751, Unknown=0, NotChecked=0, Total=3660 [2020-07-20 16:38:03,714 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2020-07-20 16:38:03,725 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 130. [2020-07-20 16:38:03,725 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 130 states. [2020-07-20 16:38:03,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 197 transitions. [2020-07-20 16:38:03,727 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 197 transitions. Word has length 1498 [2020-07-20 16:38:03,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:38:03,728 INFO L479 AbstractCegarLoop]: Abstraction has 130 states and 197 transitions. [2020-07-20 16:38:03,728 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-07-20 16:38:03,728 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 197 transitions. [2020-07-20 16:38:03,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1676 [2020-07-20 16:38:03,750 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:38:03,751 INFO L422 BasicCegarLoop]: trace histogram [245, 245, 198, 122, 122, 122, 122, 122, 122, 122, 76, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:38:03,964 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:38:03,965 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:38:03,965 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:38:03,966 INFO L82 PathProgramCache]: Analyzing trace with hash -1947361163, now seen corresponding path program 17 times [2020-07-20 16:38:03,967 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:38:03,967 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [250763003] [2020-07-20 16:38:03,967 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:38:04,994 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:38:04,994 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:38:05,002 INFO L263 TraceCheckSpWp]: Trace formula consists of 2499 conjuncts, 38 conjunts are in the unsatisfiable core [2020-07-20 16:38:05,015 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:38:06,505 INFO L134 CoverageAnalysis]: Checked inductivity of 168587 backedges. 9826 proven. 14112 refuted. 0 times theorem prover too weak. 144649 trivial. 0 not checked. [2020-07-20 16:38:06,506 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:38:13,511 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:38:13,512 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:38:14,595 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:38:15,263 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:38:15,678 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:38:15,947 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:38:16,105 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:38:16,105 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:38:16,200 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:38:16,201 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:38:19,159 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-20 16:38:23,807 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:38:23,807 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:38:26,625 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:38:28,489 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:38:28,490 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:38:29,660 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:38:29,660 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:38:30,376 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:38:30,377 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:38:30,805 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:38:31,085 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:38:31,249 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:38:31,351 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:38:32,474 INFO L134 CoverageAnalysis]: Checked inductivity of 168587 backedges. 9826 proven. 14315 refuted. 0 times theorem prover too weak. 144446 trivial. 0 not checked. [2020-07-20 16:38:32,474 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [250763003] [2020-07-20 16:38:32,474 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:38:32,475 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 39] total 41 [2020-07-20 16:38:32,475 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [517363613] [2020-07-20 16:38:32,476 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-07-20 16:38:32,476 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:38:32,477 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-07-20 16:38:32,477 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=269, Invalid=1371, Unknown=0, NotChecked=0, Total=1640 [2020-07-20 16:38:32,477 INFO L87 Difference]: Start difference. First operand 130 states and 197 transitions. Second operand 41 states. [2020-07-20 16:38:34,625 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:38:34,626 INFO L93 Difference]: Finished difference Result 279 states and 438 transitions. [2020-07-20 16:38:34,628 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-07-20 16:38:34,629 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 1675 [2020-07-20 16:38:34,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:38:34,632 INFO L225 Difference]: With dead ends: 279 [2020-07-20 16:38:34,632 INFO L226 Difference]: Without dead ends: 157 [2020-07-20 16:38:34,636 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3376 GetRequests, 3273 SyntacticMatches, 37 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1167 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1115, Invalid=3441, Unknown=0, NotChecked=0, Total=4556 [2020-07-20 16:38:34,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2020-07-20 16:38:34,657 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 134. [2020-07-20 16:38:34,658 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 134 states. [2020-07-20 16:38:34,659 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 204 transitions. [2020-07-20 16:38:34,660 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 204 transitions. Word has length 1675 [2020-07-20 16:38:34,661 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:38:34,661 INFO L479 AbstractCegarLoop]: Abstraction has 134 states and 204 transitions. [2020-07-20 16:38:34,661 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-07-20 16:38:34,661 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 204 transitions. [2020-07-20 16:38:34,703 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2425 [2020-07-20 16:38:34,704 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:38:34,705 INFO L422 BasicCegarLoop]: trace histogram [355, 355, 287, 177, 177, 177, 177, 177, 177, 177, 110, 68, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:38:34,917 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:38:34,918 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:38:34,918 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:38:34,920 INFO L82 PathProgramCache]: Analyzing trace with hash 222700524, now seen corresponding path program 18 times [2020-07-20 16:38:34,920 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:38:34,920 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [889807529] [2020-07-20 16:38:34,921 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:38:36,223 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:38:36,224 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:38:36,236 INFO L263 TraceCheckSpWp]: Trace formula consists of 3616 conjuncts, 42 conjunts are in the unsatisfiable core [2020-07-20 16:38:36,256 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:38:38,895 INFO L134 CoverageAnalysis]: Checked inductivity of 354685 backedges. 12810 proven. 26340 refuted. 0 times theorem prover too weak. 315535 trivial. 0 not checked. [2020-07-20 16:38:38,895 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:38:42,152 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 31 [2020-07-20 16:38:52,248 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:38:52,249 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:38:55,387 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:38:57,388 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:38:58,652 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:38:59,434 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:38:59,435 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:38:59,917 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:38:59,918 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:39:00,223 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:39:00,224 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:39:00,406 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:39:00,522 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:39:00,523 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:39:08,709 WARN L193 SmtUtils]: Spent 164.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 16:39:09,250 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:39:09,251 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:39:12,541 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:39:12,542 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:39:14,663 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:39:16,005 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:39:16,006 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:39:16,832 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:39:17,334 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:39:17,687 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:39:17,688 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:39:17,876 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:39:17,877 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:39:17,997 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:39:17,997 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:39:20,209 INFO L134 CoverageAnalysis]: Checked inductivity of 354685 backedges. 12810 proven. 26592 refuted. 0 times theorem prover too weak. 315283 trivial. 0 not checked. [2020-07-20 16:39:20,210 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [889807529] [2020-07-20 16:39:20,210 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:39:20,211 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 43] total 45 [2020-07-20 16:39:20,211 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1251373521] [2020-07-20 16:39:20,213 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-07-20 16:39:20,214 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:39:20,214 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-07-20 16:39:20,215 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=307, Invalid=1673, Unknown=0, NotChecked=0, Total=1980 [2020-07-20 16:39:20,215 INFO L87 Difference]: Start difference. First operand 134 states and 204 transitions. Second operand 45 states. [2020-07-20 16:39:24,538 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:39:24,538 INFO L93 Difference]: Finished difference Result 300 states and 521 transitions. [2020-07-20 16:39:24,540 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2020-07-20 16:39:24,540 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 2424 [2020-07-20 16:39:24,541 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:39:24,544 INFO L225 Difference]: With dead ends: 300 [2020-07-20 16:39:24,545 INFO L226 Difference]: Without dead ends: 174 [2020-07-20 16:39:24,549 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4893 GetRequests, 4763 SyntacticMatches, 41 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2072 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=1899, Invalid=6291, Unknown=0, NotChecked=0, Total=8190 [2020-07-20 16:39:24,550 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 174 states. [2020-07-20 16:39:24,560 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 174 to 140. [2020-07-20 16:39:24,560 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 140 states. [2020-07-20 16:39:24,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 212 transitions. [2020-07-20 16:39:24,562 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 212 transitions. Word has length 2424 [2020-07-20 16:39:24,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:39:24,563 INFO L479 AbstractCegarLoop]: Abstraction has 140 states and 212 transitions. [2020-07-20 16:39:24,563 INFO L480 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-07-20 16:39:24,563 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 212 transitions. [2020-07-20 16:39:24,591 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1962 [2020-07-20 16:39:24,592 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:39:24,593 INFO L422 BasicCegarLoop]: trace histogram [287, 287, 232, 143, 143, 143, 143, 143, 143, 143, 89, 55, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:39:24,805 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:39:24,806 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:39:24,806 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:39:24,807 INFO L82 PathProgramCache]: Analyzing trace with hash -1868832152, now seen corresponding path program 19 times [2020-07-20 16:39:24,808 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:39:24,808 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1797975207] [2020-07-20 16:39:24,808 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:39:26,195 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:39:26,195 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:39:26,206 INFO L263 TraceCheckSpWp]: Trace formula consists of 3779 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-20 16:39:26,221 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:39:27,839 INFO L134 CoverageAnalysis]: Checked inductivity of 231572 backedges. 2252 proven. 14852 refuted. 0 times theorem prover too weak. 214468 trivial. 0 not checked. [2020-07-20 16:39:27,839 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:39:31,934 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-20 16:39:41,694 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:39:41,695 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:39:47,250 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:39:47,251 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:39:49,374 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 29 [2020-07-20 16:39:50,892 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:39:50,892 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:39:53,306 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:39:53,307 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:39:54,836 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:39:54,836 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:39:55,758 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:39:55,759 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:39:56,280 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:39:56,598 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:39:56,783 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:39:56,887 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:39:56,887 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:39:58,282 INFO L134 CoverageAnalysis]: Checked inductivity of 231572 backedges. 2252 proven. 15007 refuted. 0 times theorem prover too weak. 214313 trivial. 0 not checked. [2020-07-20 16:39:58,283 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1797975207] [2020-07-20 16:39:58,283 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:39:58,283 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 26 [2020-07-20 16:39:58,283 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1784416260] [2020-07-20 16:39:58,285 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-07-20 16:39:58,285 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:39:58,285 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-07-20 16:39:58,286 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=181, Invalid=469, Unknown=0, NotChecked=0, Total=650 [2020-07-20 16:39:58,286 INFO L87 Difference]: Start difference. First operand 140 states and 212 transitions. Second operand 26 states. [2020-07-20 16:39:58,916 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:39:58,916 INFO L93 Difference]: Finished difference Result 140 states and 212 transitions. [2020-07-20 16:39:58,919 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 16:39:58,919 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 1961 [2020-07-20 16:39:58,922 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:39:58,922 INFO L225 Difference]: With dead ends: 140 [2020-07-20 16:39:58,922 INFO L226 Difference]: Without dead ends: 0 [2020-07-20 16:39:58,924 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3932 GetRequests, 3874 SyntacticMatches, 23 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 320 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=456, Invalid=876, Unknown=0, NotChecked=0, Total=1332 [2020-07-20 16:39:58,924 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-20 16:39:58,924 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-20 16:39:58,925 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-20 16:39:58,925 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-20 16:39:58,925 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 1961 [2020-07-20 16:39:58,925 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:39:58,925 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-20 16:39:58,926 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-07-20 16:39:58,926 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-20 16:39:58,926 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-20 16:39:59,136 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:39:59,140 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-20 16:39:59,378 WARN L193 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 108 DAG size of output: 54 [2020-07-20 16:40:01,943 WARN L193 SmtUtils]: Spent 1.43 s on a formula simplification. DAG size of input: 200 DAG size of output: 57 [2020-07-20 16:40:02,112 WARN L193 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 1 [2020-07-20 16:40:02,596 WARN L193 SmtUtils]: Spent 462.00 ms on a formula simplification. DAG size of input: 186 DAG size of output: 8 [2020-07-20 16:40:02,601 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-20 16:40:02,601 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-20 16:40:02,601 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-20 16:40:02,601 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-20 16:40:02,602 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-20 16:40:02,602 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-20 16:40:02,602 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 27) no Hoare annotation was computed. [2020-07-20 16:40:02,602 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 23 30) the Hoare annotation is: true [2020-07-20 16:40:02,602 INFO L268 CegarLoopResult]: For program point L27(line 27) no Hoare annotation was computed. [2020-07-20 16:40:02,602 INFO L268 CegarLoopResult]: For program point L26(lines 26 28) no Hoare annotation was computed. [2020-07-20 16:40:02,603 INFO L264 CegarLoopResult]: At program point L25(line 25) the Hoare annotation is: (and (<= main_~x~0 10) (<= 10 main_~x~0)) [2020-07-20 16:40:02,603 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 23 30) no Hoare annotation was computed. [2020-07-20 16:40:02,603 INFO L268 CegarLoopResult]: For program point L25-1(line 25) no Hoare annotation was computed. [2020-07-20 16:40:02,603 INFO L268 CegarLoopResult]: For program point L26-2(lines 26 28) no Hoare annotation was computed. [2020-07-20 16:40:02,603 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 23 30) no Hoare annotation was computed. [2020-07-20 16:40:02,603 INFO L268 CegarLoopResult]: For program point fiboEXIT(lines 5 13) no Hoare annotation was computed. [2020-07-20 16:40:02,603 INFO L268 CegarLoopResult]: For program point fiboFINAL(lines 5 13) no Hoare annotation was computed. [2020-07-20 16:40:02,604 INFO L264 CegarLoopResult]: At program point L11(line 11) the Hoare annotation is: (and (<= fibo_~n |fibo_#in~n|) (<= |fibo_#in~n| fibo_~n) (<= 2 |fibo_#in~n|)) [2020-07-20 16:40:02,604 INFO L268 CegarLoopResult]: For program point L11-1(line 11) no Hoare annotation was computed. [2020-07-20 16:40:02,604 INFO L264 CegarLoopResult]: At program point L11-2(line 11) the Hoare annotation is: (let ((.cse0 (= |fibo_#t~ret0| 1)) (.cse1 (<= fibo_~n |fibo_#in~n|)) (.cse2 (<= |fibo_#in~n| fibo_~n))) (or (and .cse0 .cse1 .cse2 (<= 3 |fibo_#in~n|) (<= |fibo_#in~n| 3)) (and (<= |fibo_#in~n| 6) .cse1 .cse2 (= 5 |fibo_#t~ret0|) (<= 6 |fibo_#in~n|)) (and .cse1 .cse2 (<= 11 fibo_~n)) (and (= 13 |fibo_#t~ret0|) .cse2 (<= fibo_~n 8) (<= 8 |fibo_#in~n|)) (and .cse1 (<= 9 fibo_~n) (<= |fibo_#in~n| 9) (= 21 |fibo_#t~ret0|)) (and (<= 5 |fibo_#in~n|) .cse1 .cse2 (<= |fibo_#in~n| 5) (= |fibo_#t~ret0| 3)) (and .cse2 (<= fibo_~n 10) (= |fibo_#t~ret0| 34) (<= 10 |fibo_#in~n|)) (and (<= 4 |fibo_#in~n|) (= |fibo_#t~ret0| 2) .cse2 (<= fibo_~n 4)) (and .cse2 (<= fibo_~n 7) (<= 7 |fibo_#in~n|) (= |fibo_#t~ret0| 8)) (and .cse0 .cse1 (<= |fibo_#in~n| 2) .cse2 (<= 2 |fibo_#in~n|)))) [2020-07-20 16:40:02,604 INFO L268 CegarLoopResult]: For program point L8(lines 8 12) no Hoare annotation was computed. [2020-07-20 16:40:02,604 INFO L268 CegarLoopResult]: For program point L11-3(line 11) no Hoare annotation was computed. [2020-07-20 16:40:02,604 INFO L268 CegarLoopResult]: For program point L6(lines 6 12) no Hoare annotation was computed. [2020-07-20 16:40:02,604 INFO L271 CegarLoopResult]: At program point fiboENTRY(lines 5 13) the Hoare annotation is: true [2020-07-20 16:40:02,610 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 04:40:02 BoogieIcfgContainer [2020-07-20 16:40:02,610 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 16:40:02,612 INFO L168 Benchmark]: Toolchain (without parser) took 280522.69 ms. Allocated memory was 145.2 MB in the beginning and 2.7 GB in the end (delta: 2.6 GB). Free memory was 103.0 MB in the beginning and 2.1 GB in the end (delta: -2.0 GB). Peak memory consumption was 542.5 MB. Max. memory is 7.1 GB. [2020-07-20 16:40:02,612 INFO L168 Benchmark]: CDTParser took 0.84 ms. Allocated memory is still 145.2 MB. Free memory was 121.4 MB in the beginning and 121.2 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. [2020-07-20 16:40:02,613 INFO L168 Benchmark]: CACSL2BoogieTranslator took 246.69 ms. Allocated memory is still 145.2 MB. Free memory was 102.5 MB in the beginning and 93.3 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. [2020-07-20 16:40:02,613 INFO L168 Benchmark]: Boogie Preprocessor took 33.30 ms. Allocated memory is still 145.2 MB. Free memory was 93.3 MB in the beginning and 91.9 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. [2020-07-20 16:40:02,615 INFO L168 Benchmark]: RCFGBuilder took 363.27 ms. Allocated memory was 145.2 MB in the beginning and 202.9 MB in the end (delta: 57.7 MB). Free memory was 91.9 MB in the beginning and 170.1 MB in the end (delta: -78.2 MB). Peak memory consumption was 10.1 MB. Max. memory is 7.1 GB. [2020-07-20 16:40:02,615 INFO L168 Benchmark]: TraceAbstraction took 279872.60 ms. Allocated memory was 202.9 MB in the beginning and 2.7 GB in the end (delta: 2.5 GB). Free memory was 170.1 MB in the beginning and 2.1 GB in the end (delta: -2.0 GB). Peak memory consumption was 552.0 MB. Max. memory is 7.1 GB. [2020-07-20 16:40:02,621 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.84 ms. Allocated memory is still 145.2 MB. Free memory was 121.4 MB in the beginning and 121.2 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 246.69 ms. Allocated memory is still 145.2 MB. Free memory was 102.5 MB in the beginning and 93.3 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 33.30 ms. Allocated memory is still 145.2 MB. Free memory was 93.3 MB in the beginning and 91.9 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 363.27 ms. Allocated memory was 145.2 MB in the beginning and 202.9 MB in the end (delta: 57.7 MB). Free memory was 91.9 MB in the beginning and 170.1 MB in the end (delta: -78.2 MB). Peak memory consumption was 10.1 MB. Max. memory is 7.1 GB. * TraceAbstraction took 279872.60 ms. Allocated memory was 202.9 MB in the beginning and 2.7 GB in the end (delta: 2.5 GB). Free memory was 170.1 MB in the beginning and 2.1 GB in the end (delta: -2.0 GB). Peak memory consumption was 552.0 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 27]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 24 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 276.2s, OverallIterations: 24, TraceHistogramMax: 355, AutomataDifference: 21.6s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 3.4s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 727 SDtfs, 4549 SDslu, 4682 SDs, 0 SdLazy, 7652 SolverSat, 7155 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 8.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 33012 GetRequests, 31750 SyntacticMatches, 441 SemanticMatches, 821 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10655 ImplicationChecksByTransitivity, 21.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=154occurred in iteration=20, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.3s AutomataMinimizationTime, 24 MinimizatonAttempts, 246 StatesRemovedByMinimization, 16 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 8 LocationsWithAnnotation, 596 PreInvPairs, 725 NumberOfFragments, 162 HoareAnnotationTreeSize, 596 FomulaSimplifications, 6460 FormulaSimplificationTreeSizeReduction, 1.3s HoareSimplificationTime, 8 FomulaSimplificationsInter, 8982 FormulaSimplificationTreeSizeReductionInter, 2.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.8s SsaConstructionTime, 3.2s SatisfiabilityAnalysisTime, 239.9s InterpolantComputationTime, 16363 NumberOfCodeBlocks, 9024 NumberOfCodeBlocksAsserted, 62 NumberOfCheckSat, 32653 ConstructedInterpolants, 0 QuantifiedInterpolants, 63988327 SizeOfPredicates, 228 NumberOfNonLiveVariables, 24871 ConjunctsInSsa, 1149 ConjunctsInUnsatCore, 46 InterpolantComputations, 2 PerfectInterpolantSequences, 2784344/3069122 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...