/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_25-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 16:42:40,812 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 16:42:40,815 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 16:42:40,834 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 16:42:40,835 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 16:42:40,837 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 16:42:40,838 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 16:42:40,849 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 16:42:40,854 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 16:42:40,856 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 16:42:40,857 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 16:42:40,858 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 16:42:40,858 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 16:42:40,861 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 16:42:40,863 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 16:42:40,864 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 16:42:40,865 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 16:42:40,866 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 16:42:40,868 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 16:42:40,873 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 16:42:40,878 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 16:42:40,881 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 16:42:40,882 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 16:42:40,883 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 16:42:40,885 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 16:42:40,894 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 16:42:40,895 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 16:42:40,897 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 16:42:40,897 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 16:42:40,934 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 16:42:40,934 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 16:42:40,937 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 16:42:40,937 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 16:42:40,937 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 16:42:40,937 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 16:42:40,938 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 16:42:40,938 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 16:42:40,938 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 16:42:40,939 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 16:42:40,939 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 16:42:40,939 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 16:42:40,939 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 16:42:40,939 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 16:42:40,940 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 16:42:40,940 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 16:42:40,940 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 16:42:40,940 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 16:42:40,940 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 16:42:40,940 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 16:42:40,941 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 16:42:40,941 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 16:42:40,941 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 16:42:40,941 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 16:42:40,941 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 16:42:40,942 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 16:42:40,942 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:42:40,942 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 16:42:40,942 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 16:42:40,942 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 16:42:41,223 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 16:42:41,244 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 16:42:41,247 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 16:42:41,251 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 16:42:41,251 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 16:42:41,252 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_25-2.c [2020-07-20 16:42:41,329 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5461fbb5d/63b4e8265b1b443bb5fe90cb480d8ed5/FLAG7eb88f461 [2020-07-20 16:42:41,745 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 16:42:41,746 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_25-2.c [2020-07-20 16:42:41,755 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5461fbb5d/63b4e8265b1b443bb5fe90cb480d8ed5/FLAG7eb88f461 [2020-07-20 16:42:42,144 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5461fbb5d/63b4e8265b1b443bb5fe90cb480d8ed5 [2020-07-20 16:42:42,154 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 16:42:42,157 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 16:42:42,158 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 16:42:42,158 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 16:42:42,161 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 16:42:42,162 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 04:42:42" (1/1) ... [2020-07-20 16:42:42,165 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5275884 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:42:42, skipping insertion in model container [2020-07-20 16:42:42,165 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 04:42:42" (1/1) ... [2020-07-20 16:42:42,173 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 16:42:42,191 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 16:42:42,352 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 16:42:42,356 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 16:42:42,371 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 16:42:42,385 INFO L208 MainTranslator]: Completed translation [2020-07-20 16:42:42,386 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:42:42 WrapperNode [2020-07-20 16:42:42,386 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 16:42:42,386 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 16:42:42,387 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 16:42:42,387 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 16:42:42,400 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:42:42" (1/1) ... [2020-07-20 16:42:42,400 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:42:42" (1/1) ... [2020-07-20 16:42:42,405 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:42:42" (1/1) ... [2020-07-20 16:42:42,405 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:42:42" (1/1) ... [2020-07-20 16:42:42,409 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:42:42" (1/1) ... [2020-07-20 16:42:42,411 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:42:42" (1/1) ... [2020-07-20 16:42:42,411 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:42:42" (1/1) ... [2020-07-20 16:42:42,413 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 16:42:42,413 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 16:42:42,413 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 16:42:42,413 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 16:42:42,414 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:42:42" (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 16:42:42,561 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 16:42:42,561 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 16:42:42,561 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo [2020-07-20 16:42:42,561 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 16:42:42,561 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 16:42:42,562 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 16:42:42,562 INFO L130 BoogieDeclarations]: Found specification of procedure fibo [2020-07-20 16:42:42,562 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 16:42:42,562 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 16:42:42,562 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 16:42:42,742 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 16:42:42,743 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 16:42:42,747 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 04:42:42 BoogieIcfgContainer [2020-07-20 16:42:42,747 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 16:42:42,748 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 16:42:42,748 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 16:42:42,752 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 16:42:42,752 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 04:42:42" (1/3) ... [2020-07-20 16:42:42,753 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@74bd3f18 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 04:42:42, skipping insertion in model container [2020-07-20 16:42:42,753 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:42:42" (2/3) ... [2020-07-20 16:42:42,754 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@74bd3f18 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 04:42:42, skipping insertion in model container [2020-07-20 16:42:42,754 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 04:42:42" (3/3) ... [2020-07-20 16:42:42,756 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_25-2.c [2020-07-20 16:42:42,767 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 16:42:42,775 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 16:42:42,790 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 16:42:42,815 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 16:42:42,815 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 16:42:42,815 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 16:42:42,816 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 16:42:42,816 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 16:42:42,816 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 16:42:42,816 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 16:42:42,816 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 16:42:42,832 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2020-07-20 16:42:42,838 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 16:42:42,838 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:42:42,839 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:42:42,840 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:42:42,845 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:42:42,845 INFO L82 PathProgramCache]: Analyzing trace with hash 537028541, now seen corresponding path program 1 times [2020-07-20 16:42:42,852 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:42:42,853 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [41140279] [2020-07-20 16:42:42,853 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 16:42:42,913 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:42:42,914 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:42:42,916 INFO L263 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 16:42:42,923 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:42:43,032 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 16:42:43,033 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 16:42:43,034 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [41140279] [2020-07-20 16:42:43,034 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 16:42:43,035 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 16:42:43,036 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [255096311] [2020-07-20 16:42:43,041 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 16:42:43,051 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:42:43,066 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 16:42:43,067 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 16:42:43,069 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 5 states. [2020-07-20 16:42:43,174 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:42:43,174 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2020-07-20 16:42:43,175 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 16:42:43,176 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-20 16:42:43,177 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:42:43,186 INFO L225 Difference]: With dead ends: 35 [2020-07-20 16:42:43,187 INFO L226 Difference]: Without dead ends: 21 [2020-07-20 16:42:43,190 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 16:42:43,206 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-20 16:42:43,227 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-20 16:42:43,229 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-20 16:42:43,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-20 16:42:43,232 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2020-07-20 16:42:43,233 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:42:43,233 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-20 16:42:43,233 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 16:42:43,233 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-20 16:42:43,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-20 16:42:43,235 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:42:43,235 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:42:43,443 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:42:43,444 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:42:43,444 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:42:43,445 INFO L82 PathProgramCache]: Analyzing trace with hash 179123823, now seen corresponding path program 1 times [2020-07-20 16:42:43,446 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:42:43,446 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [522576489] [2020-07-20 16:42:43,447 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 16:42:43,471 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:42:43,472 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:42:43,473 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 16:42:43,474 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:42:43,520 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 16:42:43,521 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 16:42:43,522 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [522576489] [2020-07-20 16:42:43,522 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 16:42:43,522 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 16:42:43,522 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2087628268] [2020-07-20 16:42:43,524 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 16:42:43,524 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:42:43,525 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 16:42:43,525 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 16:42:43,526 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 5 states. [2020-07-20 16:42:43,583 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:42:43,583 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-07-20 16:42:43,584 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 16:42:43,585 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-20 16:42:43,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:42:43,586 INFO L225 Difference]: With dead ends: 27 [2020-07-20 16:42:43,586 INFO L226 Difference]: Without dead ends: 23 [2020-07-20 16:42:43,588 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 16:42:43,588 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-20 16:42:43,595 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2020-07-20 16:42:43,595 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-20 16:42:43,596 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-20 16:42:43,597 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 14 [2020-07-20 16:42:43,597 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:42:43,597 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-20 16:42:43,597 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 16:42:43,598 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-20 16:42:43,599 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 16:42:43,599 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:42:43,599 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 16:42:43,813 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:42:43,814 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:42:43,815 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:42:43,817 INFO L82 PathProgramCache]: Analyzing trace with hash 806022394, now seen corresponding path program 1 times [2020-07-20 16:42:43,817 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:42:43,818 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1266556387] [2020-07-20 16:42:43,818 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 16:42:43,852 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:42:43,853 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:42:43,853 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 16:42:43,856 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:42:43,907 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 16:42:43,907 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:42:44,076 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:44,120 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 16:42:44,120 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1266556387] [2020-07-20 16:42:44,121 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:42:44,121 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-20 16:42:44,121 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1156925117] [2020-07-20 16:42:44,122 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 16:42:44,122 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:42:44,123 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 16:42:44,123 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-20 16:42:44,123 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 9 states. [2020-07-20 16:42:44,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:42:44,227 INFO L93 Difference]: Finished difference Result 32 states and 42 transitions. [2020-07-20 16:42:44,227 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 16:42:44,227 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-07-20 16:42:44,228 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:42:44,229 INFO L225 Difference]: With dead ends: 32 [2020-07-20 16:42:44,229 INFO L226 Difference]: Without dead ends: 28 [2020-07-20 16:42:44,230 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 16:42:44,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-20 16:42:44,238 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-07-20 16:42:44,238 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-20 16:42:44,239 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-20 16:42:44,240 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 26 [2020-07-20 16:42:44,240 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:42:44,240 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-20 16:42:44,240 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 16:42:44,240 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-20 16:42:44,242 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 16:42:44,242 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:42:44,242 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 16:42:44,455 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:42:44,456 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:42:44,456 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:42:44,456 INFO L82 PathProgramCache]: Analyzing trace with hash -983862936, now seen corresponding path program 1 times [2020-07-20 16:42:44,457 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:42:44,457 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [3847395] [2020-07-20 16:42:44,457 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 16:42:44,487 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:42:44,487 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:42:44,488 INFO L263 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 16:42:44,490 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:42:44,530 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 16:42:44,530 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:42:44,662 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:44,696 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 16:42:44,696 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [3847395] [2020-07-20 16:42:44,697 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:42:44,697 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-20 16:42:44,697 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1732348909] [2020-07-20 16:42:44,698 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 16:42:44,698 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:42:44,698 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 16:42:44,698 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-20 16:42:44,699 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 9 states. [2020-07-20 16:42:44,772 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:42:44,772 INFO L93 Difference]: Finished difference Result 37 states and 54 transitions. [2020-07-20 16:42:44,773 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 16:42:44,773 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2020-07-20 16:42:44,773 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:42:44,775 INFO L225 Difference]: With dead ends: 37 [2020-07-20 16:42:44,775 INFO L226 Difference]: Without dead ends: 33 [2020-07-20 16:42:44,776 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 44 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-20 16:42:44,776 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-20 16:42:44,783 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 26. [2020-07-20 16:42:44,783 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-20 16:42:44,785 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-20 16:42:44,785 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 27 [2020-07-20 16:42:44,785 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:42:44,786 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-20 16:42:44,786 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 16:42:44,786 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-20 16:42:44,787 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-20 16:42:44,787 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:42:44,788 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 16:42:45,002 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:42:45,003 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:42:45,004 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:42:45,004 INFO L82 PathProgramCache]: Analyzing trace with hash -2027372739, now seen corresponding path program 2 times [2020-07-20 16:42:45,005 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:42:45,005 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [765111969] [2020-07-20 16:42:45,005 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 16:42:45,046 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:42:45,047 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:42:45,048 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 16:42:45,053 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:42:45,121 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 16:42:45,122 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:42:45,358 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:45,359 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:45,405 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:45,406 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:45,438 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 16:42:45,439 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [765111969] [2020-07-20 16:42:45,439 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:42:45,439 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-20 16:42:45,440 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [866234644] [2020-07-20 16:42:45,440 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 16:42:45,440 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:42:45,441 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 16:42:45,441 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-20 16:42:45,441 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 11 states. [2020-07-20 16:42:45,590 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:42:45,591 INFO L93 Difference]: Finished difference Result 42 states and 68 transitions. [2020-07-20 16:42:45,591 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 16:42:45,591 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 39 [2020-07-20 16:42:45,592 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:42:45,594 INFO L225 Difference]: With dead ends: 42 [2020-07-20 16:42:45,594 INFO L226 Difference]: Without dead ends: 38 [2020-07-20 16:42:45,595 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 16:42:45,595 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-20 16:42:45,605 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 31. [2020-07-20 16:42:45,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-20 16:42:45,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-20 16:42:45,607 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 39 [2020-07-20 16:42:45,607 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:42:45,615 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-20 16:42:45,615 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 16:42:45,616 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-20 16:42:45,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-20 16:42:45,620 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:42:45,620 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 16:42:45,833 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:42:45,834 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:42:45,835 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:42:45,835 INFO L82 PathProgramCache]: Analyzing trace with hash -1111873851, now seen corresponding path program 2 times [2020-07-20 16:42:45,836 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:42:45,837 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2126690574] [2020-07-20 16:42:45,837 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 16:42:45,870 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:42:45,870 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:42:45,871 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 16:42:45,877 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:42:45,922 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 16:42:45,923 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:42:46,131 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:46,180 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:46,181 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:46,211 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 16:42:46,212 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2126690574] [2020-07-20 16:42:46,212 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:42:46,212 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-20 16:42:46,213 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1545155361] [2020-07-20 16:42:46,213 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 16:42:46,213 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:42:46,214 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 16:42:46,214 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-20 16:42:46,214 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 11 states. [2020-07-20 16:42:46,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:42:46,348 INFO L93 Difference]: Finished difference Result 47 states and 84 transitions. [2020-07-20 16:42:46,349 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 16:42:46,349 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 41 [2020-07-20 16:42:46,350 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:42:46,356 INFO L225 Difference]: With dead ends: 47 [2020-07-20 16:42:46,357 INFO L226 Difference]: Without dead ends: 43 [2020-07-20 16:42:46,357 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 16:42:46,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-07-20 16:42:46,378 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 31. [2020-07-20 16:42:46,378 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-20 16:42:46,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-20 16:42:46,380 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 41 [2020-07-20 16:42:46,382 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:42:46,383 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-20 16:42:46,383 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 16:42:46,383 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-20 16:42:46,384 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-07-20 16:42:46,385 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:42:46,385 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 16:42:46,603 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:42:46,604 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:42:46,605 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:42:46,605 INFO L82 PathProgramCache]: Analyzing trace with hash -767819153, now seen corresponding path program 3 times [2020-07-20 16:42:46,605 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:42:46,606 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1268204327] [2020-07-20 16:42:46,606 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 16:42:46,652 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:42:46,653 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:42:46,654 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 16:42:46,656 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:42:46,710 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 16:42:46,711 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:42:47,098 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:47,201 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:47,202 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:47,248 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:47,252 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:47,296 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 16:42:47,297 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1268204327] [2020-07-20 16:42:47,297 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:42:47,297 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-20 16:42:47,298 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1762278564] [2020-07-20 16:42:47,300 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 16:42:47,301 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:42:47,301 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 16:42:47,301 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-20 16:42:47,301 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 13 states. [2020-07-20 16:42:47,471 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:42:47,471 INFO L93 Difference]: Finished difference Result 52 states and 102 transitions. [2020-07-20 16:42:47,471 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 16:42:47,472 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 65 [2020-07-20 16:42:47,472 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:42:47,474 INFO L225 Difference]: With dead ends: 52 [2020-07-20 16:42:47,475 INFO L226 Difference]: Without dead ends: 48 [2020-07-20 16:42:47,475 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 111 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-20 16:42:47,476 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-20 16:42:47,491 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 36. [2020-07-20 16:42:47,491 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-20 16:42:47,494 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-20 16:42:47,495 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 65 [2020-07-20 16:42:47,497 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:42:47,497 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-20 16:42:47,497 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 16:42:47,497 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-20 16:42:47,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-07-20 16:42:47,506 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:42:47,507 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 16:42:47,716 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:42:47,717 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:42:47,718 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:42:47,718 INFO L82 PathProgramCache]: Analyzing trace with hash 1474757101, now seen corresponding path program 3 times [2020-07-20 16:42:47,719 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:42:47,719 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2096515004] [2020-07-20 16:42:47,720 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 16:42:47,773 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:42:47,773 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:42:47,774 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 16:42:47,777 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:42:47,895 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 16:42:47,896 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:42:48,527 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:48,635 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:48,695 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:48,925 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:48,926 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:48,974 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:49,029 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 16:42:49,030 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2096515004] [2020-07-20 16:42:49,031 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:42:49,031 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 21 [2020-07-20 16:42:49,031 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1023829848] [2020-07-20 16:42:49,032 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 16:42:49,032 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:42:49,032 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 16:42:49,033 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=344, Unknown=0, NotChecked=0, Total=420 [2020-07-20 16:42:49,033 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 21 states. [2020-07-20 16:42:49,551 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:42:49,551 INFO L93 Difference]: Finished difference Result 94 states and 184 transitions. [2020-07-20 16:42:49,553 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-07-20 16:42:49,554 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 96 [2020-07-20 16:42:49,554 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:42:49,556 INFO L225 Difference]: With dead ends: 94 [2020-07-20 16:42:49,556 INFO L226 Difference]: Without dead ends: 64 [2020-07-20 16:42:49,559 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 16:42:49,559 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-07-20 16:42:49,568 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 61. [2020-07-20 16:42:49,568 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-20 16:42:49,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 77 transitions. [2020-07-20 16:42:49,570 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 77 transitions. Word has length 96 [2020-07-20 16:42:49,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:42:49,570 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 77 transitions. [2020-07-20 16:42:49,570 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 16:42:49,571 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 77 transitions. [2020-07-20 16:42:49,572 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-07-20 16:42:49,572 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:42:49,572 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 16:42:49,785 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:42:49,786 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:42:49,787 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:42:49,787 INFO L82 PathProgramCache]: Analyzing trace with hash 2001184551, now seen corresponding path program 4 times [2020-07-20 16:42:49,787 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:42:49,788 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1445706589] [2020-07-20 16:42:49,789 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 16:42:49,836 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:42:49,836 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:42:49,837 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 16:42:49,844 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:42:49,890 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 16:42:49,890 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:42:50,213 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:50,290 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:50,331 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:50,366 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 16:42:50,366 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1445706589] [2020-07-20 16:42:50,366 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:42:50,366 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-20 16:42:50,367 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [588817468] [2020-07-20 16:42:50,367 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 16:42:50,367 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:42:50,367 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 16:42:50,368 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-20 16:42:50,368 INFO L87 Difference]: Start difference. First operand 61 states and 77 transitions. Second operand 13 states. [2020-07-20 16:42:50,495 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:42:50,495 INFO L93 Difference]: Finished difference Result 65 states and 80 transitions. [2020-07-20 16:42:50,496 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 16:42:50,496 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 68 [2020-07-20 16:42:50,496 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:42:50,498 INFO L225 Difference]: With dead ends: 65 [2020-07-20 16:42:50,498 INFO L226 Difference]: Without dead ends: 61 [2020-07-20 16:42:50,499 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 16:42:50,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-07-20 16:42:50,506 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2020-07-20 16:42:50,506 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-20 16:42:50,507 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 76 transitions. [2020-07-20 16:42:50,508 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 76 transitions. Word has length 68 [2020-07-20 16:42:50,508 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:42:50,508 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 76 transitions. [2020-07-20 16:42:50,508 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 16:42:50,509 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 76 transitions. [2020-07-20 16:42:50,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-07-20 16:42:50,510 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:42:50,510 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 16:42:50,716 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:42:50,717 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:42:50,718 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:42:50,718 INFO L82 PathProgramCache]: Analyzing trace with hash 1200034344, now seen corresponding path program 5 times [2020-07-20 16:42:50,719 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:42:50,720 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [412541342] [2020-07-20 16:42:50,720 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 16:42:50,808 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:42:50,809 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:42:50,810 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 16:42:50,813 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:42:50,879 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 16:42:50,880 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:42:51,420 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:51,571 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:51,572 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:51,650 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:51,697 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:51,731 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 16:42:51,731 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [412541342] [2020-07-20 16:42:51,731 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:42:51,732 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-20 16:42:51,732 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [800232272] [2020-07-20 16:42:51,732 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 16:42:51,733 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:42:51,733 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 16:42:51,733 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-20 16:42:51,733 INFO L87 Difference]: Start difference. First operand 61 states and 76 transitions. Second operand 15 states. [2020-07-20 16:42:51,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:42:51,875 INFO L93 Difference]: Finished difference Result 68 states and 84 transitions. [2020-07-20 16:42:51,876 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 16:42:51,876 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 109 [2020-07-20 16:42:51,877 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:42:51,877 INFO L225 Difference]: With dead ends: 68 [2020-07-20 16:42:51,877 INFO L226 Difference]: Without dead ends: 64 [2020-07-20 16:42:51,878 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 222 GetRequests, 194 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2020-07-20 16:42:51,879 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-07-20 16:42:51,892 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2020-07-20 16:42:51,892 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-07-20 16:42:51,896 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 80 transitions. [2020-07-20 16:42:51,896 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 80 transitions. Word has length 109 [2020-07-20 16:42:51,896 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:42:51,897 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 80 transitions. [2020-07-20 16:42:51,897 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 16:42:51,897 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 80 transitions. [2020-07-20 16:42:51,902 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 219 [2020-07-20 16:42:51,902 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:42:51,903 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 16:42:52,117 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:42:52,118 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:42:52,118 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:42:52,118 INFO L82 PathProgramCache]: Analyzing trace with hash 706081956, now seen corresponding path program 6 times [2020-07-20 16:42:52,119 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:42:52,119 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1114737374] [2020-07-20 16:42:52,119 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 16:42:52,210 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:42:52,211 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:42:52,212 INFO L263 TraceCheckSpWp]: Trace formula consists of 331 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 16:42:52,216 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:42:52,356 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 16:42:52,356 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:42:53,506 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:53,673 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:53,759 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:53,808 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:53,809 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:54,389 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:54,390 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:54,537 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:54,623 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:54,675 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:54,676 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:54,756 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 16:42:54,757 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1114737374] [2020-07-20 16:42:54,757 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:42:54,757 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 23] total 25 [2020-07-20 16:42:54,757 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1123356524] [2020-07-20 16:42:54,758 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 16:42:54,758 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:42:54,758 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 16:42:54,759 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=493, Unknown=0, NotChecked=0, Total=600 [2020-07-20 16:42:54,759 INFO L87 Difference]: Start difference. First operand 64 states and 80 transitions. Second operand 25 states. [2020-07-20 16:42:55,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:42:55,464 INFO L93 Difference]: Finished difference Result 144 states and 221 transitions. [2020-07-20 16:42:55,464 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-07-20 16:42:55,465 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 218 [2020-07-20 16:42:55,465 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:42:55,468 INFO L225 Difference]: With dead ends: 144 [2020-07-20 16:42:55,468 INFO L226 Difference]: Without dead ends: 88 [2020-07-20 16:42:55,470 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 456 GetRequests, 391 SyntacticMatches, 21 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 422 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=539, Invalid=1531, Unknown=0, NotChecked=0, Total=2070 [2020-07-20 16:42:55,470 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-07-20 16:42:55,480 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 78. [2020-07-20 16:42:55,480 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2020-07-20 16:42:55,481 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 102 transitions. [2020-07-20 16:42:55,481 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 102 transitions. Word has length 218 [2020-07-20 16:42:55,482 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:42:55,482 INFO L479 AbstractCegarLoop]: Abstraction has 78 states and 102 transitions. [2020-07-20 16:42:55,482 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 16:42:55,482 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 102 transitions. [2020-07-20 16:42:55,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2020-07-20 16:42:55,484 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:42:55,485 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 16:42:55,698 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:42:55,699 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:42:55,700 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:42:55,700 INFO L82 PathProgramCache]: Analyzing trace with hash 259499213, now seen corresponding path program 7 times [2020-07-20 16:42:55,700 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:42:55,701 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [890218931] [2020-07-20 16:42:55,701 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 16:42:55,817 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:42:55,817 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:42:55,819 INFO L263 TraceCheckSpWp]: Trace formula consists of 345 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 16:42:55,822 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:42:55,898 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 16:42:55,898 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:42:56,751 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:56,752 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:56,990 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:57,151 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:57,153 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:57,238 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:57,280 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:57,330 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 16:42:57,331 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [890218931] [2020-07-20 16:42:57,331 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:42:57,331 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-20 16:42:57,331 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1651202223] [2020-07-20 16:42:57,332 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 16:42:57,332 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:42:57,332 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 16:42:57,332 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-20 16:42:57,333 INFO L87 Difference]: Start difference. First operand 78 states and 102 transitions. Second operand 17 states. [2020-07-20 16:42:57,538 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:42:57,538 INFO L93 Difference]: Finished difference Result 85 states and 111 transitions. [2020-07-20 16:42:57,539 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 16:42:57,539 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 177 [2020-07-20 16:42:57,540 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:42:57,541 INFO L225 Difference]: With dead ends: 85 [2020-07-20 16:42:57,541 INFO L226 Difference]: Without dead ends: 81 [2020-07-20 16:42:57,542 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 16:42:57,544 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2020-07-20 16:42:57,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 81. [2020-07-20 16:42:57,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-07-20 16:42:57,567 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 107 transitions. [2020-07-20 16:42:57,567 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 107 transitions. Word has length 177 [2020-07-20 16:42:57,568 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:42:57,568 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 107 transitions. [2020-07-20 16:42:57,568 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 16:42:57,571 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 107 transitions. [2020-07-20 16:42:57,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 287 [2020-07-20 16:42:57,577 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:42:57,577 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 16:42:57,790 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:42:57,791 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:42:57,791 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:42:57,792 INFO L82 PathProgramCache]: Analyzing trace with hash -1425621089, now seen corresponding path program 8 times [2020-07-20 16:42:57,792 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:42:57,793 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [598041918] [2020-07-20 16:42:57,793 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 16:42:57,938 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:42:57,938 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:42:57,941 INFO L263 TraceCheckSpWp]: Trace formula consists of 554 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 16:42:57,947 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:42:58,089 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 16:42:58,090 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:42:59,555 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:59,556 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:42:59,965 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:00,233 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:00,234 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:00,375 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:00,457 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:00,501 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:00,588 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 16:43:00,589 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [598041918] [2020-07-20 16:43:00,589 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:43:00,589 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-20 16:43:00,590 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1930564321] [2020-07-20 16:43:00,591 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 16:43:00,591 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:43:00,591 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 16:43:00,591 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-20 16:43:00,591 INFO L87 Difference]: Start difference. First operand 81 states and 107 transitions. Second operand 19 states. [2020-07-20 16:43:00,844 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:43:00,844 INFO L93 Difference]: Finished difference Result 90 states and 124 transitions. [2020-07-20 16:43:00,845 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 16:43:00,845 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 286 [2020-07-20 16:43:00,846 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:43:00,847 INFO L225 Difference]: With dead ends: 90 [2020-07-20 16:43:00,848 INFO L226 Difference]: Without dead ends: 86 [2020-07-20 16:43:00,848 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 16:43:00,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-07-20 16:43:00,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 86. [2020-07-20 16:43:00,856 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2020-07-20 16:43:00,858 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 120 transitions. [2020-07-20 16:43:00,858 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 120 transitions. Word has length 286 [2020-07-20 16:43:00,859 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:43:00,859 INFO L479 AbstractCegarLoop]: Abstraction has 86 states and 120 transitions. [2020-07-20 16:43:00,859 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 16:43:00,859 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 120 transitions. [2020-07-20 16:43:00,862 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 505 [2020-07-20 16:43:00,863 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:43:00,863 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 16:43:01,078 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:43:01,079 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:43:01,079 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:43:01,079 INFO L82 PathProgramCache]: Analyzing trace with hash -350328107, now seen corresponding path program 9 times [2020-07-20 16:43:01,079 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:43:01,080 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1721249715] [2020-07-20 16:43:01,080 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 16:43:01,266 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:43:01,266 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:43:01,269 INFO L263 TraceCheckSpWp]: Trace formula consists of 754 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-20 16:43:01,275 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:43:01,570 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 16:43:01,570 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:43:04,509 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:04,768 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:04,768 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:04,927 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:05,017 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:05,018 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:05,069 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:05,070 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:06,016 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:06,017 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:06,267 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:06,268 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:06,424 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:06,425 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:06,512 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:06,513 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:06,564 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:06,734 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 16:43:06,735 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1721249715] [2020-07-20 16:43:06,735 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:43:06,735 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 27] total 29 [2020-07-20 16:43:06,735 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [912093970] [2020-07-20 16:43:06,736 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-20 16:43:06,736 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:43:06,737 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-20 16:43:06,737 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=139, Invalid=673, Unknown=0, NotChecked=0, Total=812 [2020-07-20 16:43:06,737 INFO L87 Difference]: Start difference. First operand 86 states and 120 transitions. Second operand 29 states. [2020-07-20 16:43:07,895 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:43:07,895 INFO L93 Difference]: Finished difference Result 187 states and 314 transitions. [2020-07-20 16:43:07,896 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-07-20 16:43:07,896 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 504 [2020-07-20 16:43:07,897 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:43:07,898 INFO L225 Difference]: With dead ends: 187 [2020-07-20 16:43:07,898 INFO L226 Difference]: Without dead ends: 109 [2020-07-20 16:43:07,902 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1033 GetRequests, 955 SyntacticMatches, 25 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 652 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=747, Invalid=2223, Unknown=0, NotChecked=0, Total=2970 [2020-07-20 16:43:07,903 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2020-07-20 16:43:07,911 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 98. [2020-07-20 16:43:07,912 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 98 states. [2020-07-20 16:43:07,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 135 transitions. [2020-07-20 16:43:07,913 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 135 transitions. Word has length 504 [2020-07-20 16:43:07,914 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:43:07,914 INFO L479 AbstractCegarLoop]: Abstraction has 98 states and 135 transitions. [2020-07-20 16:43:07,914 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-20 16:43:07,914 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 135 transitions. [2020-07-20 16:43:07,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 464 [2020-07-20 16:43:07,918 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:43:07,918 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 16:43:08,132 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:43:08,133 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:43:08,134 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:43:08,134 INFO L82 PathProgramCache]: Analyzing trace with hash -229001048, now seen corresponding path program 10 times [2020-07-20 16:43:08,134 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:43:08,135 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1291790209] [2020-07-20 16:43:08,135 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 16:43:08,399 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:43:08,399 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:43:08,402 INFO L263 TraceCheckSpWp]: Trace formula consists of 894 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 16:43:08,409 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:43:08,593 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 16:43:08,593 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:43:10,673 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:10,674 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:11,367 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:11,368 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:11,795 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:11,796 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:12,040 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:12,199 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:12,290 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:12,290 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:12,338 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:12,339 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:12,485 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 16:43:12,486 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1291790209] [2020-07-20 16:43:12,486 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:43:12,487 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-20 16:43:12,487 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [42554776] [2020-07-20 16:43:12,488 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 16:43:12,488 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:43:12,489 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 16:43:12,489 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-20 16:43:12,489 INFO L87 Difference]: Start difference. First operand 98 states and 135 transitions. Second operand 21 states. [2020-07-20 16:43:12,807 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:43:12,807 INFO L93 Difference]: Finished difference Result 107 states and 153 transitions. [2020-07-20 16:43:12,807 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 16:43:12,808 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 463 [2020-07-20 16:43:12,810 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:43:12,811 INFO L225 Difference]: With dead ends: 107 [2020-07-20 16:43:12,812 INFO L226 Difference]: Without dead ends: 103 [2020-07-20 16:43:12,812 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 933 GetRequests, 890 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2020-07-20 16:43:12,813 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2020-07-20 16:43:12,819 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2020-07-20 16:43:12,819 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-07-20 16:43:12,821 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 149 transitions. [2020-07-20 16:43:12,822 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 149 transitions. Word has length 463 [2020-07-20 16:43:12,823 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:43:12,823 INFO L479 AbstractCegarLoop]: Abstraction has 103 states and 149 transitions. [2020-07-20 16:43:12,823 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 16:43:12,823 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 149 transitions. [2020-07-20 16:43:12,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 995 [2020-07-20 16:43:12,830 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:43:12,831 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 16:43:13,031 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:43:13,032 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:43:13,032 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:43:13,033 INFO L82 PathProgramCache]: Analyzing trace with hash -928557949, now seen corresponding path program 11 times [2020-07-20 16:43:13,033 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:43:13,034 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [31954015] [2020-07-20 16:43:13,034 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 16:43:13,320 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 16:43:13,321 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:43:13,325 INFO L263 TraceCheckSpWp]: Trace formula consists of 791 conjuncts, 32 conjunts are in the unsatisfiable core [2020-07-20 16:43:13,338 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:43:13,910 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 16:43:13,911 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:43:19,755 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:19,756 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:20,388 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:20,836 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:20,837 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:21,135 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:21,306 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:21,406 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:21,466 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:23,031 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:23,032 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:23,467 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:23,468 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:23,743 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:23,743 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:23,914 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:24,016 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:24,082 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:24,082 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:24,524 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 16:43:24,525 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [31954015] [2020-07-20 16:43:24,525 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:43:24,525 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 33] total 37 [2020-07-20 16:43:24,526 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1073971723] [2020-07-20 16:43:24,527 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-07-20 16:43:24,527 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:43:24,527 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-07-20 16:43:24,528 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=208, Invalid=1124, Unknown=0, NotChecked=0, Total=1332 [2020-07-20 16:43:24,528 INFO L87 Difference]: Start difference. First operand 103 states and 149 transitions. Second operand 37 states. [2020-07-20 16:43:26,344 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:43:26,344 INFO L93 Difference]: Finished difference Result 257 states and 498 transitions. [2020-07-20 16:43:26,345 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-07-20 16:43:26,345 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 994 [2020-07-20 16:43:26,346 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:43:26,351 INFO L225 Difference]: With dead ends: 257 [2020-07-20 16:43:26,351 INFO L226 Difference]: Without dead ends: 162 [2020-07-20 16:43:26,356 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2023 GetRequests, 1923 SyntacticMatches, 29 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1244 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1231, Invalid=4025, Unknown=0, NotChecked=0, Total=5256 [2020-07-20 16:43:26,357 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2020-07-20 16:43:26,376 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 129. [2020-07-20 16:43:26,376 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 129 states. [2020-07-20 16:43:26,382 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 186 transitions. [2020-07-20 16:43:26,383 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 186 transitions. Word has length 994 [2020-07-20 16:43:26,384 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:43:26,384 INFO L479 AbstractCegarLoop]: Abstraction has 129 states and 186 transitions. [2020-07-20 16:43:26,385 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-07-20 16:43:26,385 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 186 transitions. [2020-07-20 16:43:26,394 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 750 [2020-07-20 16:43:26,394 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:43:26,395 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 16:43:26,608 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:43:26,609 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:43:26,609 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:43:26,610 INFO L82 PathProgramCache]: Analyzing trace with hash -127293739, now seen corresponding path program 12 times [2020-07-20 16:43:26,610 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:43:26,610 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [123753502] [2020-07-20 16:43:26,611 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 16:43:27,102 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:43:27,103 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:43:27,107 INFO L263 TraceCheckSpWp]: Trace formula consists of 1446 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 16:43:27,117 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:43:27,450 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 16:43:27,450 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:43:30,691 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:31,880 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:32,599 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:33,037 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:33,037 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:33,305 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:33,306 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:33,479 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:33,589 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:33,649 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:33,899 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 16:43:33,900 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [123753502] [2020-07-20 16:43:33,900 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:43:33,901 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-20 16:43:33,901 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1598847712] [2020-07-20 16:43:33,902 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 16:43:33,902 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:43:33,903 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 16:43:33,903 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-20 16:43:33,903 INFO L87 Difference]: Start difference. First operand 129 states and 186 transitions. Second operand 23 states. [2020-07-20 16:43:34,186 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:43:34,186 INFO L93 Difference]: Finished difference Result 136 states and 198 transitions. [2020-07-20 16:43:34,187 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 16:43:34,187 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 749 [2020-07-20 16:43:34,189 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:43:34,190 INFO L225 Difference]: With dead ends: 136 [2020-07-20 16:43:34,191 INFO L226 Difference]: Without dead ends: 132 [2020-07-20 16:43:34,192 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1506 GetRequests, 1458 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2020-07-20 16:43:34,192 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2020-07-20 16:43:34,199 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 132. [2020-07-20 16:43:34,199 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 132 states. [2020-07-20 16:43:34,200 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 194 transitions. [2020-07-20 16:43:34,201 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 194 transitions. Word has length 749 [2020-07-20 16:43:34,202 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:43:34,202 INFO L479 AbstractCegarLoop]: Abstraction has 132 states and 194 transitions. [2020-07-20 16:43:34,202 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 16:43:34,202 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 194 transitions. [2020-07-20 16:43:34,254 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2098 [2020-07-20 16:43:34,254 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:43:34,255 INFO L422 BasicCegarLoop]: trace histogram [307, 307, 248, 153, 153, 153, 153, 153, 153, 153, 95, 59, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:43:34,466 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:43:34,466 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:43:34,467 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:43:34,468 INFO L82 PathProgramCache]: Analyzing trace with hash -1575583038, now seen corresponding path program 13 times [2020-07-20 16:43:34,468 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:43:34,468 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1470876395] [2020-07-20 16:43:34,469 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 16:43:35,160 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:43:35,160 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:43:35,167 INFO L263 TraceCheckSpWp]: Trace formula consists of 3131 conjuncts, 46 conjunts are in the unsatisfiable core [2020-07-20 16:43:35,192 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:43:37,157 INFO L134 CoverageAnalysis]: Checked inductivity of 265024 backedges. 11579 proven. 25169 refuted. 0 times theorem prover too weak. 228276 trivial. 0 not checked. [2020-07-20 16:43:37,157 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:43:47,869 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:50,778 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:53,236 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:53,237 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:55,245 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:56,925 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:58,302 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:59,132 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:59,650 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:59,963 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:43:59,963 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:00,163 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:00,163 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:00,282 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:00,283 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:00,360 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:04,205 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:04,206 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:05,556 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:05,557 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:06,414 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:06,415 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:07,000 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:07,001 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:07,319 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:07,530 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:07,655 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:07,735 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:07,736 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:09,340 INFO L134 CoverageAnalysis]: Checked inductivity of 265024 backedges. 11579 proven. 25491 refuted. 0 times theorem prover too weak. 227954 trivial. 0 not checked. [2020-07-20 16:44:09,341 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1470876395] [2020-07-20 16:44:09,341 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:44:09,341 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 47] total 51 [2020-07-20 16:44:09,341 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [902364837] [2020-07-20 16:44:09,343 INFO L459 AbstractCegarLoop]: Interpolant automaton has 51 states [2020-07-20 16:44:09,344 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:44:09,344 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2020-07-20 16:44:09,345 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=385, Invalid=2165, Unknown=0, NotChecked=0, Total=2550 [2020-07-20 16:44:09,345 INFO L87 Difference]: Start difference. First operand 132 states and 194 transitions. Second operand 51 states. [2020-07-20 16:44:14,659 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:44:14,659 INFO L93 Difference]: Finished difference Result 415 states and 1048 transitions. [2020-07-20 16:44:14,660 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2020-07-20 16:44:14,660 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 2097 [2020-07-20 16:44:14,662 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:44:14,669 INFO L225 Difference]: With dead ends: 415 [2020-07-20 16:44:14,669 INFO L226 Difference]: Without dead ends: 289 [2020-07-20 16:44:14,676 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4251 GetRequests, 4101 SyntacticMatches, 43 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3181 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=2775, Invalid=8997, Unknown=0, NotChecked=0, Total=11772 [2020-07-20 16:44:14,677 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 289 states. [2020-07-20 16:44:14,704 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 289 to 218. [2020-07-20 16:44:14,705 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 218 states. [2020-07-20 16:44:14,708 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 218 states to 218 states and 372 transitions. [2020-07-20 16:44:14,709 INFO L78 Accepts]: Start accepts. Automaton has 218 states and 372 transitions. Word has length 2097 [2020-07-20 16:44:14,711 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:44:14,711 INFO L479 AbstractCegarLoop]: Abstraction has 218 states and 372 transitions. [2020-07-20 16:44:14,711 INFO L480 AbstractCegarLoop]: Interpolant automaton has 51 states. [2020-07-20 16:44:14,712 INFO L276 IsEmpty]: Start isEmpty. Operand 218 states and 372 transitions. [2020-07-20 16:44:14,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1213 [2020-07-20 16:44:14,725 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:44:14,726 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 16:44:14,940 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:44:14,941 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:44:14,941 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:44:14,941 INFO L82 PathProgramCache]: Analyzing trace with hash 452920407, now seen corresponding path program 14 times [2020-07-20 16:44:14,941 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:44:14,942 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [391334230] [2020-07-20 16:44:14,942 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 16:44:15,688 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:44:15,688 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:44:15,695 INFO L263 TraceCheckSpWp]: Trace formula consists of 2335 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 16:44:15,708 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:44:16,388 INFO L134 CoverageAnalysis]: Checked inductivity of 87769 backedges. 1164 proven. 8218 refuted. 0 times theorem prover too weak. 78387 trivial. 0 not checked. [2020-07-20 16:44:16,389 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:44:22,014 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:24,113 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:24,114 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:25,454 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:25,455 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:26,318 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:26,318 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:26,831 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:27,142 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:27,142 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:27,331 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:27,332 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:27,438 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:27,439 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:27,499 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:27,500 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:28,094 INFO L134 CoverageAnalysis]: Checked inductivity of 87769 backedges. 1164 proven. 8344 refuted. 0 times theorem prover too weak. 78261 trivial. 0 not checked. [2020-07-20 16:44:28,095 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [391334230] [2020-07-20 16:44:28,095 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:44:28,096 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 25 [2020-07-20 16:44:28,096 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [568456814] [2020-07-20 16:44:28,097 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 16:44:28,097 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:44:28,097 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 16:44:28,098 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2020-07-20 16:44:28,098 INFO L87 Difference]: Start difference. First operand 218 states and 372 transitions. Second operand 25 states. [2020-07-20 16:44:28,529 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:44:28,529 INFO L93 Difference]: Finished difference Result 222 states and 375 transitions. [2020-07-20 16:44:28,532 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 16:44:28,532 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 1212 [2020-07-20 16:44:28,534 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:44:28,539 INFO L225 Difference]: With dead ends: 222 [2020-07-20 16:44:28,539 INFO L226 Difference]: Without dead ends: 218 [2020-07-20 16:44:28,540 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2433 GetRequests, 2380 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 16:44:28,540 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 218 states. [2020-07-20 16:44:28,554 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 218 to 218. [2020-07-20 16:44:28,555 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 218 states. [2020-07-20 16:44:28,557 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 218 states to 218 states and 371 transitions. [2020-07-20 16:44:28,558 INFO L78 Accepts]: Start accepts. Automaton has 218 states and 371 transitions. Word has length 1212 [2020-07-20 16:44:28,559 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:44:28,559 INFO L479 AbstractCegarLoop]: Abstraction has 218 states and 371 transitions. [2020-07-20 16:44:28,559 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 16:44:28,560 INFO L276 IsEmpty]: Start isEmpty. Operand 218 states and 371 transitions. [2020-07-20 16:44:28,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1962 [2020-07-20 16:44:28,589 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:44:28,590 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 16:44:28,803 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:44:28,804 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:44:28,804 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:44:28,804 INFO L82 PathProgramCache]: Analyzing trace with hash -1868832152, now seen corresponding path program 15 times [2020-07-20 16:44:28,805 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:44:28,805 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [49206820] [2020-07-20 16:44:28,805 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 16:44:29,856 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:44:29,856 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:44:29,867 INFO L263 TraceCheckSpWp]: Trace formula consists of 3779 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-20 16:44:29,887 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:44:31,631 INFO L134 CoverageAnalysis]: Checked inductivity of 231572 backedges. 2007 proven. 15097 refuted. 0 times theorem prover too weak. 214468 trivial. 0 not checked. [2020-07-20 16:44:31,631 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:44:40,270 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:43,847 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:45,977 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:47,363 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:48,241 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:48,242 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:48,787 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:48,787 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:49,110 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:49,111 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:49,311 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:49,424 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:49,425 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:49,490 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:49,491 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:44:50,865 INFO L134 CoverageAnalysis]: Checked inductivity of 231572 backedges. 2007 proven. 15252 refuted. 0 times theorem prover too weak. 214313 trivial. 0 not checked. [2020-07-20 16:44:50,865 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [49206820] [2020-07-20 16:44:50,865 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:44:50,866 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 27 [2020-07-20 16:44:50,866 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [778916258] [2020-07-20 16:44:50,868 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-20 16:44:50,868 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:44:50,868 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-20 16:44:50,869 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2020-07-20 16:44:50,869 INFO L87 Difference]: Start difference. First operand 218 states and 371 transitions. Second operand 27 states. [2020-07-20 16:44:51,376 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:44:51,377 INFO L93 Difference]: Finished difference Result 225 states and 390 transitions. [2020-07-20 16:44:51,377 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 16:44:51,378 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 1961 [2020-07-20 16:44:51,381 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:44:51,385 INFO L225 Difference]: With dead ends: 225 [2020-07-20 16:44:51,385 INFO L226 Difference]: Without dead ends: 221 [2020-07-20 16:44:51,386 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3932 GetRequests, 3874 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406 [2020-07-20 16:44:51,387 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 221 states. [2020-07-20 16:44:51,399 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 221 to 221. [2020-07-20 16:44:51,400 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 221 states. [2020-07-20 16:44:51,402 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 221 states to 221 states and 384 transitions. [2020-07-20 16:44:51,402 INFO L78 Accepts]: Start accepts. Automaton has 221 states and 384 transitions. Word has length 1961 [2020-07-20 16:44:51,404 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:44:51,404 INFO L479 AbstractCegarLoop]: Abstraction has 221 states and 384 transitions. [2020-07-20 16:44:51,404 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-20 16:44:51,404 INFO L276 IsEmpty]: Start isEmpty. Operand 221 states and 384 transitions. [2020-07-20 16:44:51,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4386 [2020-07-20 16:44:51,511 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:44:51,512 INFO L422 BasicCegarLoop]: trace histogram [643, 643, 520, 321, 321, 321, 321, 321, 321, 321, 199, 123, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:44:51,713 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:44:51,713 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:44:51,714 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:44:51,716 INFO L82 PathProgramCache]: Analyzing trace with hash 1809736744, now seen corresponding path program 16 times [2020-07-20 16:44:51,717 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:44:51,717 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1805248148] [2020-07-20 16:44:51,717 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 16:44:53,174 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:44:53,174 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:44:53,189 INFO L263 TraceCheckSpWp]: Trace formula consists of 6540 conjuncts, 46 conjunts are in the unsatisfiable core [2020-07-20 16:44:53,226 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:44:59,821 INFO L134 CoverageAnalysis]: Checked inductivity of 1165992 backedges. 23222 proven. 56314 refuted. 0 times theorem prover too weak. 1086456 trivial. 0 not checked. [2020-07-20 16:44:59,822 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:45:17,800 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:21,278 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 16:45:21,817 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:21,818 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:24,289 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:24,289 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:25,875 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:26,919 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:26,920 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:27,533 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:27,906 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:28,168 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:28,169 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:28,316 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:28,316 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:28,419 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:38,780 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:42,833 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:45,470 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:45,471 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:47,176 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:47,177 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:48,338 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:49,021 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:49,022 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:49,433 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:49,683 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:49,684 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:49,845 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:49,950 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:49,951 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:56,566 INFO L134 CoverageAnalysis]: Checked inductivity of 1165992 backedges. 23222 proven. 56624 refuted. 0 times theorem prover too weak. 1086146 trivial. 0 not checked. [2020-07-20 16:45:56,567 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1805248148] [2020-07-20 16:45:56,567 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:45:56,568 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 47] total 49 [2020-07-20 16:45:56,568 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [509657478] [2020-07-20 16:45:56,571 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2020-07-20 16:45:56,571 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:45:56,571 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2020-07-20 16:45:56,572 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=359, Invalid=1993, Unknown=0, NotChecked=0, Total=2352 [2020-07-20 16:45:56,572 INFO L87 Difference]: Start difference. First operand 221 states and 384 transitions. Second operand 49 states. [2020-07-20 16:46:00,848 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:46:00,848 INFO L93 Difference]: Finished difference Result 482 states and 856 transitions. [2020-07-20 16:46:00,849 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2020-07-20 16:46:00,849 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 4385 [2020-07-20 16:46:00,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:46:00,857 INFO L225 Difference]: With dead ends: 482 [2020-07-20 16:46:00,857 INFO L226 Difference]: Without dead ends: 269 [2020-07-20 16:46:00,862 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8820 GetRequests, 8677 SyntacticMatches, 45 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2552 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=2267, Invalid=7633, Unknown=0, NotChecked=0, Total=9900 [2020-07-20 16:46:00,863 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 269 states. [2020-07-20 16:46:00,877 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 269 to 205. [2020-07-20 16:46:00,877 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 205 states. [2020-07-20 16:46:00,879 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 326 transitions. [2020-07-20 16:46:00,879 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 326 transitions. Word has length 4385 [2020-07-20 16:46:00,881 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:46:00,881 INFO L479 AbstractCegarLoop]: Abstraction has 205 states and 326 transitions. [2020-07-20 16:46:00,881 INFO L480 AbstractCegarLoop]: Interpolant automaton has 49 states. [2020-07-20 16:46:00,881 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 326 transitions. [2020-07-20 16:46:00,947 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3174 [2020-07-20 16:46:00,947 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:46:00,949 INFO L422 BasicCegarLoop]: trace histogram [465, 465, 376, 232, 232, 232, 232, 232, 232, 232, 144, 89, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:46:01,154 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:46:01,156 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:46:01,156 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:46:01,158 INFO L82 PathProgramCache]: Analyzing trace with hash -740538915, now seen corresponding path program 17 times [2020-07-20 16:46:01,158 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:46:01,158 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1597153842] [2020-07-20 16:46:01,159 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 16:46:02,626 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:46:02,626 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:46:02,641 INFO L263 TraceCheckSpWp]: Trace formula consists of 6112 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-20 16:46:02,664 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:46:05,916 INFO L134 CoverageAnalysis]: Checked inductivity of 609204 backedges. 3400 proven. 27297 refuted. 0 times theorem prover too weak. 578507 trivial. 0 not checked. [2020-07-20 16:46:05,916 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:46:22,048 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:22,049 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:28,911 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:33,284 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:33,285 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:36,038 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:36,039 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:37,852 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:38,991 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:39,705 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:39,706 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:40,126 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:40,392 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:40,540 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:40,541 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:40,636 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:40,637 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:43,950 INFO L134 CoverageAnalysis]: Checked inductivity of 609204 backedges. 3400 proven. 27484 refuted. 0 times theorem prover too weak. 578320 trivial. 0 not checked. [2020-07-20 16:46:43,950 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1597153842] [2020-07-20 16:46:43,950 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:46:43,951 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 27] total 29 [2020-07-20 16:46:43,951 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [422689350] [2020-07-20 16:46:43,954 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-20 16:46:43,954 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:46:43,954 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-20 16:46:43,955 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2020-07-20 16:46:43,955 INFO L87 Difference]: Start difference. First operand 205 states and 326 transitions. Second operand 29 states. [2020-07-20 16:46:44,467 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:46:44,467 INFO L93 Difference]: Finished difference Result 209 states and 329 transitions. [2020-07-20 16:46:44,469 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-20 16:46:44,469 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 3173 [2020-07-20 16:46:44,473 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:46:44,476 INFO L225 Difference]: With dead ends: 209 [2020-07-20 16:46:44,476 INFO L226 Difference]: Without dead ends: 205 [2020-07-20 16:46:44,477 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6357 GetRequests, 6294 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640 [2020-07-20 16:46:44,477 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2020-07-20 16:46:44,488 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 205. [2020-07-20 16:46:44,489 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 205 states. [2020-07-20 16:46:44,491 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 325 transitions. [2020-07-20 16:46:44,491 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 325 transitions. Word has length 3173 [2020-07-20 16:46:44,494 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:46:44,494 INFO L479 AbstractCegarLoop]: Abstraction has 205 states and 325 transitions. [2020-07-20 16:46:44,494 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-20 16:46:44,494 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 325 transitions. [2020-07-20 16:46:44,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5135 [2020-07-20 16:46:44,626 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:46:44,628 INFO L422 BasicCegarLoop]: trace histogram [753, 753, 609, 376, 376, 376, 376, 376, 376, 376, 233, 144, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:46:44,834 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:46:44,835 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:46:44,835 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:46:44,838 INFO L82 PathProgramCache]: Analyzing trace with hash -1603623985, now seen corresponding path program 18 times [2020-07-20 16:46:44,838 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:46:44,838 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1251252577] [2020-07-20 16:46:44,839 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 16:46:46,918 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:46:46,919 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:46:46,942 INFO L263 TraceCheckSpWp]: Trace formula consists of 9888 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-20 16:46:46,978 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:46:54,973 INFO L134 CoverageAnalysis]: Checked inductivity of 1599648 backedges. 5686 proven. 48748 refuted. 0 times theorem prover too weak. 1545214 trivial. 0 not checked. [2020-07-20 16:46:54,973 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:47:02,222 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 88 [2020-07-20 16:47:22,627 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:22,628 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:35,161 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:35,162 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:42,860 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:42,861 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:47,969 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:47,971 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:51,271 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:53,374 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:53,374 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:54,706 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:55,519 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:56,006 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:56,007 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:56,329 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:56,329 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:56,519 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:56,520 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:56,624 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:04,839 INFO L134 CoverageAnalysis]: Checked inductivity of 1599648 backedges. 5686 proven. 48970 refuted. 0 times theorem prover too weak. 1544992 trivial. 0 not checked. [2020-07-20 16:48:04,840 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1251252577] [2020-07-20 16:48:04,840 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:48:04,842 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 29] total 31 [2020-07-20 16:48:04,842 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [779457218] [2020-07-20 16:48:04,845 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-07-20 16:48:04,845 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:48:04,845 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-07-20 16:48:04,846 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=242, Invalid=688, Unknown=0, NotChecked=0, Total=930 [2020-07-20 16:48:04,846 INFO L87 Difference]: Start difference. First operand 205 states and 325 transitions. Second operand 31 states. [2020-07-20 16:48:05,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:48:05,576 INFO L93 Difference]: Finished difference Result 212 states and 342 transitions. [2020-07-20 16:48:05,579 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-07-20 16:48:05,579 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 5134 [2020-07-20 16:48:05,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:48:05,588 INFO L225 Difference]: With dead ends: 212 [2020-07-20 16:48:05,588 INFO L226 Difference]: Without dead ends: 208 [2020-07-20 16:48:05,589 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10280 GetRequests, 10212 SyntacticMatches, 26 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 494 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=619, Invalid=1273, Unknown=0, NotChecked=0, Total=1892 [2020-07-20 16:48:05,589 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2020-07-20 16:48:05,600 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 208. [2020-07-20 16:48:05,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 208 states. [2020-07-20 16:48:05,602 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 208 states to 208 states and 338 transitions. [2020-07-20 16:48:05,602 INFO L78 Accepts]: Start accepts. Automaton has 208 states and 338 transitions. Word has length 5134 [2020-07-20 16:48:05,606 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:48:05,606 INFO L479 AbstractCegarLoop]: Abstraction has 208 states and 338 transitions. [2020-07-20 16:48:05,606 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-07-20 16:48:05,606 INFO L276 IsEmpty]: Start isEmpty. Operand 208 states and 338 transitions. [2020-07-20 16:48:06,223 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8308 [2020-07-20 16:48:06,223 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:48:06,227 INFO L422 BasicCegarLoop]: trace histogram [1219, 1219, 986, 609, 609, 609, 609, 609, 609, 609, 377, 233, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:48:06,440 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:48:06,441 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:48:06,441 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:48:06,445 INFO L82 PathProgramCache]: Analyzing trace with hash -497867032, now seen corresponding path program 19 times [2020-07-20 16:48:06,445 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:48:06,445 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1955981336] [2020-07-20 16:48:06,445 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 16:48:09,493 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:48:09,493 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:48:09,548 INFO L263 TraceCheckSpWp]: Trace formula consists of 15998 conjuncts, 30 conjunts are in the unsatisfiable core [2020-07-20 16:48:09,615 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:48:31,824 INFO L134 CoverageAnalysis]: Checked inductivity of 4195633 backedges. 9420 proven. 86206 refuted. 0 times theorem prover too weak. 4100007 trivial. 0 not checked. [2020-07-20 16:48:31,824 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:48:37,752 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 16:48:37,854 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 16:48:40,282 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-20 16:48:40,393 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-20 16:48:40,512 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-20 16:48:40,632 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-20 16:48:44,450 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2020-07-20 16:48:44,572 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2020-07-20 16:48:44,699 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 73 [2020-07-20 16:48:44,830 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 73 [2020-07-20 16:48:44,956 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 98 [2020-07-20 16:48:45,074 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 95 [2020-07-20 16:48:45,186 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2020-07-20 16:48:45,293 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 88 [2020-07-20 16:48:45,395 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 85 [2020-07-20 16:49:24,942 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 16:49:25,055 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 16:49:25,168 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 16:49:25,295 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 16:49:27,860 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-20 16:49:27,974 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-20 16:49:28,100 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-20 16:49:28,223 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-20 16:49:28,344 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2020-07-20 16:49:28,458 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 89 [2020-07-20 16:49:28,567 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 85 [2020-07-20 16:49:28,671 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 82 [2020-07-20 16:49:29,607 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:29,608 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:53,918 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 16:49:54,026 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 16:49:54,131 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 16:49:55,933 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 16:49:56,036 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 16:49:56,145 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 16:49:56,253 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 16:49:56,361 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 85 [2020-07-20 16:49:57,418 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:14,111 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 16:50:14,214 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 16:50:14,326 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 16:50:14,437 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 16:50:14,543 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 78 [2020-07-20 16:50:14,645 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 75 [2020-07-20 16:50:15,422 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:15,423 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:26,430 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:33,606 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:37,932 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:37,933 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:40,798 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:40,799 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:42,498 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:42,499 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:43,623 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:44,305 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:44,724 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:44,725 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:44,969 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:45,109 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:07,834 INFO L134 CoverageAnalysis]: Checked inductivity of 4195633 backedges. 9420 proven. 86466 refuted. 0 times theorem prover too weak. 4099747 trivial. 0 not checked. [2020-07-20 16:51:07,835 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1955981336] [2020-07-20 16:51:07,835 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:51:07,838 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 31] total 33 [2020-07-20 16:51:07,838 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1576873565] [2020-07-20 16:51:07,844 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-07-20 16:51:07,845 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:51:07,845 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-07-20 16:51:07,846 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=274, Invalid=782, Unknown=0, NotChecked=0, Total=1056 [2020-07-20 16:51:07,846 INFO L87 Difference]: Start difference. First operand 208 states and 338 transitions. Second operand 33 states. [2020-07-20 16:51:09,165 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:51:09,166 INFO L93 Difference]: Finished difference Result 217 states and 362 transitions. [2020-07-20 16:51:09,168 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-20 16:51:09,168 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 8307 [2020-07-20 16:51:09,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:51:09,182 INFO L225 Difference]: With dead ends: 217 [2020-07-20 16:51:09,182 INFO L226 Difference]: Without dead ends: 213 [2020-07-20 16:51:09,183 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16627 GetRequests, 16554 SyntacticMatches, 28 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 574 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=708, Invalid=1454, Unknown=0, NotChecked=0, Total=2162 [2020-07-20 16:51:09,184 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 213 states. [2020-07-20 16:51:09,196 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 213 to 213. [2020-07-20 16:51:09,197 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 213 states. [2020-07-20 16:51:09,199 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 213 states to 213 states and 358 transitions. [2020-07-20 16:51:09,200 INFO L78 Accepts]: Start accepts. Automaton has 213 states and 358 transitions. Word has length 8307 [2020-07-20 16:51:09,206 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:51:09,207 INFO L479 AbstractCegarLoop]: Abstraction has 213 states and 358 transitions. [2020-07-20 16:51:09,207 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-07-20 16:51:09,207 INFO L276 IsEmpty]: Start isEmpty. Operand 213 states and 358 transitions. [2020-07-20 16:51:10,444 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13442 [2020-07-20 16:51:10,444 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:51:10,448 INFO L422 BasicCegarLoop]: trace histogram [1973, 1973, 1596, 986, 986, 986, 986, 986, 986, 986, 610, 377, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:51:10,649 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:51:10,649 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:51:10,650 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:51:10,654 INFO L82 PathProgramCache]: Analyzing trace with hash -982105371, now seen corresponding path program 20 times [2020-07-20 16:51:10,654 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:51:10,654 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [61170936] [2020-07-20 16:51:10,654 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:51:15,385 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:51:15,386 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:51:15,479 INFO L263 TraceCheckSpWp]: Trace formula consists of 25886 conjuncts, 32 conjunts are in the unsatisfiable core [2020-07-20 16:51:15,585 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:52:08,939 INFO L134 CoverageAnalysis]: Checked inductivity of 10996742 backedges. 15500 proven. 151240 refuted. 0 times theorem prover too weak. 10830002 trivial. 0 not checked. [2020-07-20 16:52:08,940 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:52:13,633 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 16:52:15,328 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 16:52:15,432 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 16:52:15,547 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 16:52:15,657 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 16:52:18,348 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-20 16:52:18,467 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-20 16:52:18,593 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-20 16:52:18,713 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-20 16:52:23,062 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2020-07-20 16:52:23,194 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2020-07-20 16:52:23,337 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 74 [2020-07-20 16:52:23,472 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 74 [2020-07-20 16:52:30,547 WARN L193 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 76 [2020-07-20 16:52:30,702 WARN L193 SmtUtils]: Spent 153.00 ms on a formula simplification that was a NOOP. DAG size: 76 [2020-07-20 16:52:30,851 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 78 [2020-07-20 16:52:31,001 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 78 [2020-07-20 16:52:31,148 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 105 [2020-07-20 16:52:31,285 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 102 [2020-07-20 16:52:31,413 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 98 [2020-07-20 16:52:31,542 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 96 [2020-07-20 16:52:31,661 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2020-07-20 16:52:31,778 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 88 [2020-07-20 16:52:31,891 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 84 [2020-07-20 16:52:31,995 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 80 [2020-07-20 16:52:32,096 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2020-07-20 16:53:42,521 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 16:53:42,632 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 16:53:42,748 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 16:53:44,666 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 16:53:44,787 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 16:53:44,911 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 16:53:45,035 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 16:53:48,063 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-20 16:53:48,192 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-20 16:53:48,328 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-20 16:53:48,464 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-20 16:53:53,212 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2020-07-20 16:53:53,351 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2020-07-20 16:53:53,501 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 74 [2020-07-20 16:53:53,650 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 74 [2020-07-20 16:53:53,798 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2020-07-20 16:53:53,938 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 96 [2020-07-20 16:53:54,067 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2020-07-20 16:53:54,194 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 89 [2020-07-20 16:53:54,312 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 85 [2020-07-20 16:53:54,425 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 81 [2020-07-20 16:53:54,535 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 78 [2020-07-20 16:53:54,639 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 75 [2020-07-20 16:53:55,508 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:55,509 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:20,390 WARN L193 SmtUtils]: Spent 1.01 s on a formula simplification that was a NOOP. DAG size: 1 [2020-07-20 16:54:40,190 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 16:54:40,295 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 16:54:41,565 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 16:54:41,675 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 16:54:41,794 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 16:54:41,913 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 16:54:43,978 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 16:54:44,101 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 16:54:44,235 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 16:54:44,361 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 16:54:47,690 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-20 16:54:47,827 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-20 16:54:47,981 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-20 16:54:48,128 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-20 16:54:48,275 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2020-07-20 16:54:48,406 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 89 [2020-07-20 16:54:48,532 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 86 [2020-07-20 16:54:48,648 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 82 [2020-07-20 16:54:48,754 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 78 [2020-07-20 16:54:48,864 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 75 [2020-07-20 16:54:48,968 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2020-07-20 16:54:49,743 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:49,744 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:18,366 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 16:55:18,475 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 16:55:18,591 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 16:55:18,705 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 16:55:20,108 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 16:55:20,228 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 16:55:20,353 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 16:55:20,480 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 16:55:22,709 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 16:55:22,839 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 16:55:22,976 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 16:55:23,111 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 16:55:23,246 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 85 [2020-07-20 16:55:23,373 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 82 [2020-07-20 16:55:23,496 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 78 [2020-07-20 16:55:23,611 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 75 [2020-07-20 16:55:23,722 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2020-07-20 16:55:23,825 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-20 16:55:23,933 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2020-07-20 16:55:24,589 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:43,670 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 16:55:45,186 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 16:55:45,306 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 16:55:45,439 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 16:55:45,575 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 16:55:45,713 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 78 [2020-07-20 16:55:45,839 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 75 [2020-07-20 16:55:45,948 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2020-07-20 16:55:46,054 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-20 16:55:46,838 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:58,851 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 16:55:58,964 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 16:55:59,075 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 16:56:00,071 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 16:56:00,187 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 16:56:00,308 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 16:56:00,422 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 16:56:00,537 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2020-07-20 16:56:00,649 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-20 16:56:01,316 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts