/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=LOWLEXORDER --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/const_1-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 18:16:11,719 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 18:16:11,722 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 18:16:11,747 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 18:16:11,747 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 18:16:11,748 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 18:16:11,750 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 18:16:11,751 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 18:16:11,753 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 18:16:11,754 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 18:16:11,755 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 18:16:11,757 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 18:16:11,757 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 18:16:11,758 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 18:16:11,759 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 18:16:11,760 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 18:16:11,761 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 18:16:11,762 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 18:16:11,764 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 18:16:11,766 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 18:16:11,767 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 18:16:11,769 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 18:16:11,770 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 18:16:11,771 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 18:16:11,774 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-21 18:16:11,785 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 18:16:11,786 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 18:16:11,786 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 18:16:11,787 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-21 18:16:11,840 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 18:16:11,841 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 18:16:11,842 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 18:16:11,842 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 18:16:11,842 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 18:16:11,842 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 18:16:11,846 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 18:16:11,846 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 18:16:11,846 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 18:16:11,846 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 18:16:11,847 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 18:16:11,847 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 18:16:11,847 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 18:16:11,847 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 18:16:11,847 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 18:16:11,847 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 18:16:11,848 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 18:16:11,848 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 18:16:11,848 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 18:16:11,848 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 18:16:11,848 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 18:16:11,850 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 18:16:11,850 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 18:16:11,851 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 18:16:11,851 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 18:16:11,851 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 18:16:11,851 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 18:16:11,851 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 18:16:11,851 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 18:16:11,852 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 -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=LOWLEXORDER;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=LOWLEXORDER;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=LOWLEXORDER;log-additional-information=true; [2020-08-21 18:16:12,188 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 18:16:12,207 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 18:16:12,212 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 18:16:12,215 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 18:16:12,216 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 18:16:12,217 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/const_1-1.c [2020-08-21 18:16:12,281 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/354abbe5b/b0a6edf9d39e492084016d18dc8575b8/FLAG01db97343 [2020-08-21 18:16:12,730 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 18:16:12,731 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-acceleration/const_1-1.c [2020-08-21 18:16:12,737 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/354abbe5b/b0a6edf9d39e492084016d18dc8575b8/FLAG01db97343 [2020-08-21 18:16:13,119 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/354abbe5b/b0a6edf9d39e492084016d18dc8575b8 [2020-08-21 18:16:13,129 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 18:16:13,130 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 18:16:13,131 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 18:16:13,132 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 18:16:13,135 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 18:16:13,137 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 06:16:13" (1/1) ... [2020-08-21 18:16:13,140 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2fdab4ef and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:16:13, skipping insertion in model container [2020-08-21 18:16:13,140 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 06:16:13" (1/1) ... [2020-08-21 18:16:13,148 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 18:16:13,170 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 18:16:13,343 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 18:16:13,347 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 18:16:13,361 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 18:16:13,374 INFO L208 MainTranslator]: Completed translation [2020-08-21 18:16:13,374 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:16:13 WrapperNode [2020-08-21 18:16:13,375 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 18:16:13,375 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 18:16:13,376 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 18:16:13,376 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 18:16:13,386 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:16:13" (1/1) ... [2020-08-21 18:16:13,387 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:16:13" (1/1) ... [2020-08-21 18:16:13,391 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:16:13" (1/1) ... [2020-08-21 18:16:13,392 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:16:13" (1/1) ... [2020-08-21 18:16:13,475 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:16:13" (1/1) ... [2020-08-21 18:16:13,480 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:16:13" (1/1) ... [2020-08-21 18:16:13,480 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:16:13" (1/1) ... [2020-08-21 18:16:13,481 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 18:16:13,482 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 18:16:13,482 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 18:16:13,482 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 18:16:13,483 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:16:13" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/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 [2020-08-21 18:16:13,544 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 18:16:13,545 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 18:16:13,545 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-21 18:16:13,545 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 18:16:13,546 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 18:16:13,546 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-21 18:16:13,546 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 18:16:13,547 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 18:16:13,547 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 18:16:13,732 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 18:16:13,732 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-21 18:16:13,736 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 06:16:13 BoogieIcfgContainer [2020-08-21 18:16:13,736 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 18:16:13,737 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 18:16:13,737 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 18:16:13,741 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 18:16:13,741 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 06:16:13" (1/3) ... [2020-08-21 18:16:13,742 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3b30244f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 06:16:13, skipping insertion in model container [2020-08-21 18:16:13,742 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:16:13" (2/3) ... [2020-08-21 18:16:13,742 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3b30244f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 06:16:13, skipping insertion in model container [2020-08-21 18:16:13,743 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 06:16:13" (3/3) ... [2020-08-21 18:16:13,745 INFO L109 eAbstractionObserver]: Analyzing ICFG const_1-1.c [2020-08-21 18:16:13,755 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 18:16:13,763 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 18:16:13,778 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 18:16:13,810 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 18:16:13,810 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 18:16:13,810 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 18:16:13,811 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 18:16:13,811 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 18:16:13,813 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 18:16:13,813 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 18:16:13,813 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 18:16:13,837 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2020-08-21 18:16:13,846 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-21 18:16:13,846 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:13,848 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:13,848 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:13,854 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:13,854 INFO L82 PathProgramCache]: Analyzing trace with hash 1846144830, now seen corresponding path program 1 times [2020-08-21 18:16:13,863 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:13,863 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1786151323] [2020-08-21 18:16:13,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:13,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:14,308 WARN L193 SmtUtils]: Spent 222.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 5 [2020-08-21 18:16:14,310 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:14,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:14,322 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:14,325 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1786151323] [2020-08-21 18:16:14,327 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 18:16:14,328 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 18:16:14,332 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [897450506] [2020-08-21 18:16:14,336 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 18:16:14,336 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:14,346 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 18:16:14,347 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 18:16:14,349 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 3 states. [2020-08-21 18:16:14,378 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:14,378 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-08-21 18:16:14,379 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 18:16:14,380 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-08-21 18:16:14,380 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:14,386 INFO L225 Difference]: With dead ends: 29 [2020-08-21 18:16:14,386 INFO L226 Difference]: Without dead ends: 12 [2020-08-21 18:16:14,389 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 18:16:14,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-08-21 18:16:14,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-08-21 18:16:14,416 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-08-21 18:16:14,417 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2020-08-21 18:16:14,418 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2020-08-21 18:16:14,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:14,419 INFO L479 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2020-08-21 18:16:14,419 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 18:16:14,419 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2020-08-21 18:16:14,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-08-21 18:16:14,420 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:14,420 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:14,420 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 18:16:14,420 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:14,421 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:14,421 INFO L82 PathProgramCache]: Analyzing trace with hash 1432376145, now seen corresponding path program 1 times [2020-08-21 18:16:14,421 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:14,422 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1180400249] [2020-08-21 18:16:14,422 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:14,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:14,514 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:14,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:14,519 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:14,520 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1180400249] [2020-08-21 18:16:14,520 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:14,520 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-08-21 18:16:14,521 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1734505822] [2020-08-21 18:16:14,522 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 18:16:14,522 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:14,523 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 18:16:14,523 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-21 18:16:14,523 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 4 states. [2020-08-21 18:16:14,545 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:14,546 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2020-08-21 18:16:14,546 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 18:16:14,547 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 11 [2020-08-21 18:16:14,547 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:14,548 INFO L225 Difference]: With dead ends: 18 [2020-08-21 18:16:14,548 INFO L226 Difference]: Without dead ends: 13 [2020-08-21 18:16:14,549 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-21 18:16:14,549 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-08-21 18:16:14,552 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-08-21 18:16:14,553 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-08-21 18:16:14,553 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2020-08-21 18:16:14,554 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2020-08-21 18:16:14,554 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:14,554 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2020-08-21 18:16:14,554 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 18:16:14,554 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2020-08-21 18:16:14,555 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-21 18:16:14,555 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:14,555 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:14,556 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 18:16:14,556 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:14,556 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:14,557 INFO L82 PathProgramCache]: Analyzing trace with hash 1490448798, now seen corresponding path program 2 times [2020-08-21 18:16:14,557 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:14,557 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [502012547] [2020-08-21 18:16:14,558 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:14,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:14,661 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:14,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:14,665 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:14,665 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [502012547] [2020-08-21 18:16:14,666 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:14,666 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-21 18:16:14,666 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [553462156] [2020-08-21 18:16:14,667 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 18:16:14,667 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:14,667 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 18:16:14,668 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-21 18:16:14,668 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 5 states. [2020-08-21 18:16:14,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:14,693 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2020-08-21 18:16:14,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 18:16:14,694 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2020-08-21 18:16:14,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:14,695 INFO L225 Difference]: With dead ends: 19 [2020-08-21 18:16:14,695 INFO L226 Difference]: Without dead ends: 14 [2020-08-21 18:16:14,696 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-21 18:16:14,696 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-08-21 18:16:14,700 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-08-21 18:16:14,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-08-21 18:16:14,701 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-08-21 18:16:14,701 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-08-21 18:16:14,702 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:14,702 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-08-21 18:16:14,702 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 18:16:14,702 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-08-21 18:16:14,703 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-21 18:16:14,703 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:14,703 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:14,703 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 18:16:14,704 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:14,704 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:14,704 INFO L82 PathProgramCache]: Analyzing trace with hash -1004266255, now seen corresponding path program 3 times [2020-08-21 18:16:14,704 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:14,705 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1005283737] [2020-08-21 18:16:14,705 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:14,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:14,821 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:14,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:14,825 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:14,825 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1005283737] [2020-08-21 18:16:14,825 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:14,826 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 18:16:14,826 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [864657330] [2020-08-21 18:16:14,826 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 18:16:14,827 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:14,827 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 18:16:14,827 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-21 18:16:14,827 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 6 states. [2020-08-21 18:16:14,853 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:14,853 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2020-08-21 18:16:14,854 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 18:16:14,854 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 13 [2020-08-21 18:16:14,854 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:14,855 INFO L225 Difference]: With dead ends: 20 [2020-08-21 18:16:14,855 INFO L226 Difference]: Without dead ends: 15 [2020-08-21 18:16:14,856 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-21 18:16:14,856 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-21 18:16:14,860 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-21 18:16:14,860 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-21 18:16:14,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-08-21 18:16:14,861 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2020-08-21 18:16:14,861 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:14,861 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-08-21 18:16:14,862 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 18:16:14,862 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-08-21 18:16:14,862 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-21 18:16:14,862 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:14,863 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:14,863 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 18:16:14,863 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:14,863 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:14,864 INFO L82 PathProgramCache]: Analyzing trace with hash -1031021570, now seen corresponding path program 4 times [2020-08-21 18:16:14,864 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:14,864 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1016479854] [2020-08-21 18:16:14,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:14,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:14,985 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:14,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:14,988 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:14,989 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1016479854] [2020-08-21 18:16:14,989 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:14,989 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 18:16:14,990 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [27755057] [2020-08-21 18:16:14,990 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 18:16:14,990 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:14,991 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 18:16:14,991 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-21 18:16:14,991 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 7 states. [2020-08-21 18:16:15,028 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:15,028 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2020-08-21 18:16:15,029 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 18:16:15,029 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 14 [2020-08-21 18:16:15,029 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:15,030 INFO L225 Difference]: With dead ends: 21 [2020-08-21 18:16:15,030 INFO L226 Difference]: Without dead ends: 16 [2020-08-21 18:16:15,031 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-21 18:16:15,031 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-21 18:16:15,035 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-21 18:16:15,036 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-21 18:16:15,036 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2020-08-21 18:16:15,037 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2020-08-21 18:16:15,037 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:15,037 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2020-08-21 18:16:15,038 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 18:16:15,038 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2020-08-21 18:16:15,038 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-21 18:16:15,038 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:15,039 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:15,039 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 18:16:15,039 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:15,040 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:15,040 INFO L82 PathProgramCache]: Analyzing trace with hash -1860436335, now seen corresponding path program 5 times [2020-08-21 18:16:15,040 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:15,040 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [533689084] [2020-08-21 18:16:15,041 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:15,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:15,185 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:15,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:15,188 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:15,191 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [533689084] [2020-08-21 18:16:15,192 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:15,192 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 18:16:15,193 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1259048955] [2020-08-21 18:16:15,193 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 18:16:15,193 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:15,195 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 18:16:15,195 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-08-21 18:16:15,195 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 8 states. [2020-08-21 18:16:15,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:15,258 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2020-08-21 18:16:15,262 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 18:16:15,263 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 15 [2020-08-21 18:16:15,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:15,263 INFO L225 Difference]: With dead ends: 22 [2020-08-21 18:16:15,264 INFO L226 Difference]: Without dead ends: 17 [2020-08-21 18:16:15,265 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-08-21 18:16:15,266 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-21 18:16:15,271 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-21 18:16:15,271 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-21 18:16:15,275 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-21 18:16:15,276 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2020-08-21 18:16:15,276 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:15,276 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-21 18:16:15,276 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 18:16:15,276 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-21 18:16:15,280 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-21 18:16:15,280 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:15,280 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:15,281 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 18:16:15,281 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:15,281 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:15,282 INFO L82 PathProgramCache]: Analyzing trace with hash -1802490274, now seen corresponding path program 6 times [2020-08-21 18:16:15,282 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:15,282 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [311029904] [2020-08-21 18:16:15,282 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:15,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:15,463 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:15,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:15,467 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:15,468 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [311029904] [2020-08-21 18:16:15,468 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:15,468 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 18:16:15,469 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1463750657] [2020-08-21 18:16:15,469 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 18:16:15,469 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:15,470 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 18:16:15,471 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-21 18:16:15,472 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 9 states. [2020-08-21 18:16:15,542 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:15,542 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2020-08-21 18:16:15,543 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 18:16:15,544 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 16 [2020-08-21 18:16:15,544 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:15,545 INFO L225 Difference]: With dead ends: 23 [2020-08-21 18:16:15,545 INFO L226 Difference]: Without dead ends: 18 [2020-08-21 18:16:15,545 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-21 18:16:15,547 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-21 18:16:15,553 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-08-21 18:16:15,553 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-21 18:16:15,554 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2020-08-21 18:16:15,554 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 16 [2020-08-21 18:16:15,554 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:15,556 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2020-08-21 18:16:15,556 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 18:16:15,556 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2020-08-21 18:16:15,558 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-21 18:16:15,558 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:15,558 INFO L422 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:15,559 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 18:16:15,559 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:15,559 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:15,559 INFO L82 PathProgramCache]: Analyzing trace with hash -6162383, now seen corresponding path program 7 times [2020-08-21 18:16:15,560 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:15,561 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2115769310] [2020-08-21 18:16:15,561 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:15,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:15,761 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:15,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:15,766 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:15,767 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2115769310] [2020-08-21 18:16:15,767 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:15,767 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 18:16:15,768 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1497754715] [2020-08-21 18:16:15,768 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 18:16:15,768 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:15,768 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 18:16:15,769 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-08-21 18:16:15,769 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 10 states. [2020-08-21 18:16:15,833 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:15,835 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2020-08-21 18:16:15,836 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 18:16:15,836 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 17 [2020-08-21 18:16:15,836 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:15,837 INFO L225 Difference]: With dead ends: 24 [2020-08-21 18:16:15,837 INFO L226 Difference]: Without dead ends: 19 [2020-08-21 18:16:15,838 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-08-21 18:16:15,838 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-08-21 18:16:15,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-08-21 18:16:15,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-21 18:16:15,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2020-08-21 18:16:15,847 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 17 [2020-08-21 18:16:15,848 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:15,849 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2020-08-21 18:16:15,850 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 18:16:15,850 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2020-08-21 18:16:15,850 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-21 18:16:15,851 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:15,851 INFO L422 BasicCegarLoop]: trace histogram [8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:15,851 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 18:16:15,851 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:15,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:15,852 INFO L82 PathProgramCache]: Analyzing trace with hash -154572610, now seen corresponding path program 8 times [2020-08-21 18:16:15,852 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:15,852 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [563784524] [2020-08-21 18:16:15,852 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:15,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:16,032 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:16,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:16,037 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:16,037 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [563784524] [2020-08-21 18:16:16,038 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:16,038 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 18:16:16,038 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [601950613] [2020-08-21 18:16:16,039 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 18:16:16,040 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:16,040 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 18:16:16,041 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-08-21 18:16:16,041 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 11 states. [2020-08-21 18:16:16,119 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:16,119 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2020-08-21 18:16:16,120 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 18:16:16,120 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 18 [2020-08-21 18:16:16,120 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:16,121 INFO L225 Difference]: With dead ends: 25 [2020-08-21 18:16:16,121 INFO L226 Difference]: Without dead ends: 20 [2020-08-21 18:16:16,122 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-08-21 18:16:16,122 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-21 18:16:16,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-21 18:16:16,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-21 18:16:16,126 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2020-08-21 18:16:16,127 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 18 [2020-08-21 18:16:16,127 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:16,127 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2020-08-21 18:16:16,127 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 18:16:16,127 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2020-08-21 18:16:16,128 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-21 18:16:16,128 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:16,128 INFO L422 BasicCegarLoop]: trace histogram [9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:16,128 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 18:16:16,129 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:16,129 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:16,129 INFO L82 PathProgramCache]: Analyzing trace with hash -460322351, now seen corresponding path program 9 times [2020-08-21 18:16:16,130 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:16,130 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [705966418] [2020-08-21 18:16:16,130 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:16,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:16,294 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:16,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:16,297 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:16,298 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [705966418] [2020-08-21 18:16:16,298 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:16,298 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 18:16:16,298 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [146191487] [2020-08-21 18:16:16,299 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 18:16:16,299 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:16,299 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 18:16:16,299 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-08-21 18:16:16,299 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 12 states. [2020-08-21 18:16:16,388 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:16,388 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-08-21 18:16:16,389 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 18:16:16,389 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 19 [2020-08-21 18:16:16,389 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:16,390 INFO L225 Difference]: With dead ends: 26 [2020-08-21 18:16:16,390 INFO L226 Difference]: Without dead ends: 21 [2020-08-21 18:16:16,390 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-08-21 18:16:16,391 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-21 18:16:16,394 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-21 18:16:16,395 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-21 18:16:16,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2020-08-21 18:16:16,396 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 19 [2020-08-21 18:16:16,396 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:16,396 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2020-08-21 18:16:16,396 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 18:16:16,396 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2020-08-21 18:16:16,397 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-21 18:16:16,397 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:16,397 INFO L422 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:16,398 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 18:16:16,398 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:16,398 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:16,408 INFO L82 PathProgramCache]: Analyzing trace with hash -1348629730, now seen corresponding path program 10 times [2020-08-21 18:16:16,409 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:16,409 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [136024494] [2020-08-21 18:16:16,409 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:16,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:16,571 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:16,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:16,574 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:16,575 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [136024494] [2020-08-21 18:16:16,575 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:16,575 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 18:16:16,576 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [330803247] [2020-08-21 18:16:16,576 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 18:16:16,576 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:16,576 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 18:16:16,577 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-08-21 18:16:16,577 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 13 states. [2020-08-21 18:16:16,686 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:16,686 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2020-08-21 18:16:16,688 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 18:16:16,688 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 20 [2020-08-21 18:16:16,689 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:16,689 INFO L225 Difference]: With dead ends: 27 [2020-08-21 18:16:16,689 INFO L226 Difference]: Without dead ends: 22 [2020-08-21 18:16:16,692 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-08-21 18:16:16,692 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-21 18:16:16,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-08-21 18:16:16,698 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-21 18:16:16,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2020-08-21 18:16:16,703 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 20 [2020-08-21 18:16:16,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:16,703 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2020-08-21 18:16:16,704 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 18:16:16,704 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2020-08-21 18:16:16,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-21 18:16:16,704 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:16,705 INFO L422 BasicCegarLoop]: trace histogram [11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:16,705 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 18:16:16,705 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:16,705 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:16,705 INFO L82 PathProgramCache]: Analyzing trace with hash 1178612593, now seen corresponding path program 11 times [2020-08-21 18:16:16,706 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:16,707 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1530931548] [2020-08-21 18:16:16,707 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:16,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:16,936 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:16,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:16,940 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:16,940 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1530931548] [2020-08-21 18:16:16,940 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:16,940 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-21 18:16:16,941 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1546768067] [2020-08-21 18:16:16,942 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-21 18:16:16,942 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:16,942 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-21 18:16:16,942 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-08-21 18:16:16,943 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 14 states. [2020-08-21 18:16:17,060 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:17,060 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2020-08-21 18:16:17,062 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-21 18:16:17,062 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 21 [2020-08-21 18:16:17,063 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:17,063 INFO L225 Difference]: With dead ends: 28 [2020-08-21 18:16:17,063 INFO L226 Difference]: Without dead ends: 23 [2020-08-21 18:16:17,064 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-08-21 18:16:17,064 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-21 18:16:17,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-08-21 18:16:17,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-21 18:16:17,071 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-08-21 18:16:17,071 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 21 [2020-08-21 18:16:17,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:17,074 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-08-21 18:16:17,074 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-21 18:16:17,075 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-08-21 18:16:17,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-21 18:16:17,075 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:17,076 INFO L422 BasicCegarLoop]: trace histogram [12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:17,076 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 18:16:17,076 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:17,076 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:17,076 INFO L82 PathProgramCache]: Analyzing trace with hash -2081254018, now seen corresponding path program 12 times [2020-08-21 18:16:17,077 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:17,077 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [97832091] [2020-08-21 18:16:17,077 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:17,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:17,320 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:17,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:17,323 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:17,323 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [97832091] [2020-08-21 18:16:17,323 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:17,324 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-21 18:16:17,324 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1075987523] [2020-08-21 18:16:17,324 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-21 18:16:17,325 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:17,325 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-21 18:16:17,325 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-08-21 18:16:17,325 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 15 states. [2020-08-21 18:16:17,451 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:17,452 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2020-08-21 18:16:17,452 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-21 18:16:17,452 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 22 [2020-08-21 18:16:17,452 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:17,453 INFO L225 Difference]: With dead ends: 29 [2020-08-21 18:16:17,453 INFO L226 Difference]: Without dead ends: 24 [2020-08-21 18:16:17,454 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-08-21 18:16:17,454 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-21 18:16:17,457 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-08-21 18:16:17,457 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-21 18:16:17,458 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2020-08-21 18:16:17,458 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 22 [2020-08-21 18:16:17,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:17,459 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2020-08-21 18:16:17,459 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-21 18:16:17,459 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2020-08-21 18:16:17,460 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-08-21 18:16:17,460 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:17,460 INFO L422 BasicCegarLoop]: trace histogram [13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:17,460 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 18:16:17,460 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:17,461 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:17,461 INFO L82 PathProgramCache]: Analyzing trace with hash -57903855, now seen corresponding path program 13 times [2020-08-21 18:16:17,461 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:17,461 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1636410686] [2020-08-21 18:16:17,461 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:17,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:17,678 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:17,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:17,682 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:17,682 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1636410686] [2020-08-21 18:16:17,683 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:17,683 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-21 18:16:17,683 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [644440006] [2020-08-21 18:16:17,684 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-21 18:16:17,684 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:17,684 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-21 18:16:17,684 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2020-08-21 18:16:17,684 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 16 states. [2020-08-21 18:16:17,838 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:17,838 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2020-08-21 18:16:17,839 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-21 18:16:17,839 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 23 [2020-08-21 18:16:17,839 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:17,840 INFO L225 Difference]: With dead ends: 30 [2020-08-21 18:16:17,840 INFO L226 Difference]: Without dead ends: 25 [2020-08-21 18:16:17,840 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2020-08-21 18:16:17,841 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-21 18:16:17,844 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-08-21 18:16:17,844 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-21 18:16:17,845 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2020-08-21 18:16:17,845 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 23 [2020-08-21 18:16:17,845 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:17,845 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2020-08-21 18:16:17,845 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-21 18:16:17,846 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2020-08-21 18:16:17,846 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-21 18:16:17,846 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:17,846 INFO L422 BasicCegarLoop]: trace histogram [14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:17,847 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-21 18:16:17,847 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:17,847 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:17,847 INFO L82 PathProgramCache]: Analyzing trace with hash -1758558242, now seen corresponding path program 14 times [2020-08-21 18:16:17,847 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:17,848 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1209520736] [2020-08-21 18:16:17,848 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:17,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:18,085 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:18,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:18,088 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:18,088 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1209520736] [2020-08-21 18:16:18,089 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:18,089 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-21 18:16:18,089 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2041084657] [2020-08-21 18:16:18,089 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-21 18:16:18,090 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:18,090 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-21 18:16:18,090 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-08-21 18:16:18,090 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 17 states. [2020-08-21 18:16:18,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:18,249 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2020-08-21 18:16:18,249 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-21 18:16:18,249 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 24 [2020-08-21 18:16:18,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:18,250 INFO L225 Difference]: With dead ends: 31 [2020-08-21 18:16:18,250 INFO L226 Difference]: Without dead ends: 26 [2020-08-21 18:16:18,251 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-08-21 18:16:18,251 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-21 18:16:18,254 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-08-21 18:16:18,255 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-21 18:16:18,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2020-08-21 18:16:18,255 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 24 [2020-08-21 18:16:18,256 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:18,256 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2020-08-21 18:16:18,256 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-21 18:16:18,256 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2020-08-21 18:16:18,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-21 18:16:18,257 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:18,257 INFO L422 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:18,257 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-21 18:16:18,257 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:18,258 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:18,258 INFO L82 PathProgramCache]: Analyzing trace with hash 1355730609, now seen corresponding path program 15 times [2020-08-21 18:16:18,258 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:18,258 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [40831284] [2020-08-21 18:16:18,258 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:18,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:18,516 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:18,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:18,520 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:18,521 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [40831284] [2020-08-21 18:16:18,521 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:18,521 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-21 18:16:18,521 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1264191065] [2020-08-21 18:16:18,522 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-21 18:16:18,522 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:18,522 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-21 18:16:18,522 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2020-08-21 18:16:18,523 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 18 states. [2020-08-21 18:16:18,690 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:18,691 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-08-21 18:16:18,691 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-21 18:16:18,691 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 25 [2020-08-21 18:16:18,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:18,692 INFO L225 Difference]: With dead ends: 32 [2020-08-21 18:16:18,692 INFO L226 Difference]: Without dead ends: 27 [2020-08-21 18:16:18,693 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2020-08-21 18:16:18,693 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-08-21 18:16:18,696 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-08-21 18:16:18,696 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-21 18:16:18,697 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2020-08-21 18:16:18,697 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 25 [2020-08-21 18:16:18,697 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:18,698 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2020-08-21 18:16:18,698 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-21 18:16:18,698 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2020-08-21 18:16:18,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-21 18:16:18,699 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:18,699 INFO L422 BasicCegarLoop]: trace histogram [16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:18,699 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-21 18:16:18,699 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:18,699 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:18,699 INFO L82 PathProgramCache]: Analyzing trace with hash -885562818, now seen corresponding path program 16 times [2020-08-21 18:16:18,700 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:18,700 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [92387846] [2020-08-21 18:16:18,700 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:18,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:19,011 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:19,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:19,015 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:19,016 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [92387846] [2020-08-21 18:16:19,016 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:19,016 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-21 18:16:19,016 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [696603655] [2020-08-21 18:16:19,017 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-21 18:16:19,017 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:19,017 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-21 18:16:19,018 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-08-21 18:16:19,018 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 19 states. [2020-08-21 18:16:19,234 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:19,235 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2020-08-21 18:16:19,242 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-21 18:16:19,242 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 26 [2020-08-21 18:16:19,242 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:19,243 INFO L225 Difference]: With dead ends: 33 [2020-08-21 18:16:19,243 INFO L226 Difference]: Without dead ends: 28 [2020-08-21 18:16:19,244 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-08-21 18:16:19,244 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-21 18:16:19,248 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-08-21 18:16:19,248 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-21 18:16:19,248 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2020-08-21 18:16:19,249 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 26 [2020-08-21 18:16:19,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:19,249 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2020-08-21 18:16:19,249 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-21 18:16:19,249 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2020-08-21 18:16:19,250 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-21 18:16:19,250 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:19,250 INFO L422 BasicCegarLoop]: trace histogram [17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:19,251 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-21 18:16:19,251 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:19,251 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:19,251 INFO L82 PathProgramCache]: Analyzing trace with hash -1646182319, now seen corresponding path program 17 times [2020-08-21 18:16:19,252 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:19,252 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [206713093] [2020-08-21 18:16:19,252 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:19,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:19,581 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:19,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:19,585 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:19,586 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [206713093] [2020-08-21 18:16:19,586 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:19,586 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-21 18:16:19,586 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [588500520] [2020-08-21 18:16:19,587 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-21 18:16:19,587 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:19,587 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-21 18:16:19,588 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2020-08-21 18:16:19,588 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 20 states. [2020-08-21 18:16:19,813 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:19,814 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2020-08-21 18:16:19,814 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-21 18:16:19,814 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 27 [2020-08-21 18:16:19,815 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:19,815 INFO L225 Difference]: With dead ends: 34 [2020-08-21 18:16:19,815 INFO L226 Difference]: Without dead ends: 29 [2020-08-21 18:16:19,816 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2020-08-21 18:16:19,817 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-21 18:16:19,820 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-08-21 18:16:19,820 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-21 18:16:19,821 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-08-21 18:16:19,821 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 27 [2020-08-21 18:16:19,821 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:19,821 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-08-21 18:16:19,821 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-21 18:16:19,822 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-08-21 18:16:19,822 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-21 18:16:19,822 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:19,822 INFO L422 BasicCegarLoop]: trace histogram [18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:19,823 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-21 18:16:19,823 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:19,823 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:19,823 INFO L82 PathProgramCache]: Analyzing trace with hash 544416926, now seen corresponding path program 18 times [2020-08-21 18:16:19,823 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:19,824 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1367012958] [2020-08-21 18:16:19,824 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:19,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:20,182 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:20,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:20,186 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:20,186 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1367012958] [2020-08-21 18:16:20,186 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:20,186 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-21 18:16:20,187 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [338205368] [2020-08-21 18:16:20,187 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-21 18:16:20,187 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:20,188 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-21 18:16:20,188 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2020-08-21 18:16:20,188 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 21 states. [2020-08-21 18:16:20,494 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:20,495 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2020-08-21 18:16:20,495 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-21 18:16:20,496 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 28 [2020-08-21 18:16:20,496 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:20,497 INFO L225 Difference]: With dead ends: 35 [2020-08-21 18:16:20,497 INFO L226 Difference]: Without dead ends: 30 [2020-08-21 18:16:20,499 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2020-08-21 18:16:20,500 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-21 18:16:20,510 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-08-21 18:16:20,510 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-21 18:16:20,511 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2020-08-21 18:16:20,511 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 28 [2020-08-21 18:16:20,514 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:20,515 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2020-08-21 18:16:20,515 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-21 18:16:20,515 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2020-08-21 18:16:20,516 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-21 18:16:20,516 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:20,516 INFO L422 BasicCegarLoop]: trace histogram [19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:20,516 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-21 18:16:20,517 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:20,519 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:20,531 INFO L82 PathProgramCache]: Analyzing trace with hash -266483215, now seen corresponding path program 19 times [2020-08-21 18:16:20,531 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:20,531 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [857017400] [2020-08-21 18:16:20,531 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:20,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:20,911 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:20,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:20,915 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:20,916 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [857017400] [2020-08-21 18:16:20,916 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:20,916 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-21 18:16:20,916 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [476233023] [2020-08-21 18:16:20,917 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-21 18:16:20,917 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:20,917 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-21 18:16:20,918 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2020-08-21 18:16:20,918 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 22 states. [2020-08-21 18:16:21,160 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:21,161 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2020-08-21 18:16:21,161 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-21 18:16:21,161 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 29 [2020-08-21 18:16:21,162 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:21,162 INFO L225 Difference]: With dead ends: 36 [2020-08-21 18:16:21,162 INFO L226 Difference]: Without dead ends: 31 [2020-08-21 18:16:21,163 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2020-08-21 18:16:21,164 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-21 18:16:21,168 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-08-21 18:16:21,169 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-21 18:16:21,169 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2020-08-21 18:16:21,169 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 29 [2020-08-21 18:16:21,170 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:21,170 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2020-08-21 18:16:21,170 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-21 18:16:21,170 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2020-08-21 18:16:21,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-21 18:16:21,172 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:21,172 INFO L422 BasicCegarLoop]: trace histogram [20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:21,173 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-21 18:16:21,173 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:21,173 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:21,173 INFO L82 PathProgramCache]: Analyzing trace with hash 365416190, now seen corresponding path program 20 times [2020-08-21 18:16:21,174 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:21,174 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1253912306] [2020-08-21 18:16:21,175 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:21,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:21,605 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:21,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:21,609 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:21,609 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1253912306] [2020-08-21 18:16:21,610 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:21,610 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-21 18:16:21,610 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [888475765] [2020-08-21 18:16:21,612 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-21 18:16:21,612 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:21,612 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-21 18:16:21,613 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2020-08-21 18:16:21,613 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 23 states. [2020-08-21 18:16:21,925 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:21,925 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2020-08-21 18:16:21,926 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-21 18:16:21,926 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 30 [2020-08-21 18:16:21,926 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:21,927 INFO L225 Difference]: With dead ends: 37 [2020-08-21 18:16:21,927 INFO L226 Difference]: Without dead ends: 32 [2020-08-21 18:16:21,928 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2020-08-21 18:16:21,929 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-21 18:16:21,932 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-08-21 18:16:21,932 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-21 18:16:21,933 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2020-08-21 18:16:21,933 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 30 [2020-08-21 18:16:21,933 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:21,933 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2020-08-21 18:16:21,934 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-21 18:16:21,934 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2020-08-21 18:16:21,934 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-21 18:16:21,934 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:21,934 INFO L422 BasicCegarLoop]: trace histogram [21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:21,935 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-21 18:16:21,935 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:21,935 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:21,935 INFO L82 PathProgramCache]: Analyzing trace with hash -1520538735, now seen corresponding path program 21 times [2020-08-21 18:16:21,936 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:21,936 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [77082039] [2020-08-21 18:16:21,936 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:21,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:22,373 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:22,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:22,377 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:22,377 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [77082039] [2020-08-21 18:16:22,378 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:22,378 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-21 18:16:22,378 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2020429918] [2020-08-21 18:16:22,378 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-21 18:16:22,378 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:22,379 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-21 18:16:22,379 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2020-08-21 18:16:22,379 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 24 states. [2020-08-21 18:16:22,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:22,688 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-08-21 18:16:22,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-21 18:16:22,689 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 31 [2020-08-21 18:16:22,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:22,690 INFO L225 Difference]: With dead ends: 38 [2020-08-21 18:16:22,690 INFO L226 Difference]: Without dead ends: 33 [2020-08-21 18:16:22,691 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2020-08-21 18:16:22,691 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-21 18:16:22,695 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-08-21 18:16:22,695 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-21 18:16:22,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2020-08-21 18:16:22,696 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 31 [2020-08-21 18:16:22,696 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:22,696 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2020-08-21 18:16:22,696 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-21 18:16:22,697 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2020-08-21 18:16:22,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-21 18:16:22,697 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:22,697 INFO L422 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:22,698 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-21 18:16:22,698 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:22,698 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:22,698 INFO L82 PathProgramCache]: Analyzing trace with hash 144400734, now seen corresponding path program 22 times [2020-08-21 18:16:22,698 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:22,699 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2005898534] [2020-08-21 18:16:22,699 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:22,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:23,207 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:23,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:23,211 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:23,212 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2005898534] [2020-08-21 18:16:23,212 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:23,212 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-21 18:16:23,212 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2143778968] [2020-08-21 18:16:23,213 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-21 18:16:23,213 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:23,213 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-21 18:16:23,214 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2020-08-21 18:16:23,214 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 25 states. [2020-08-21 18:16:23,539 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:23,539 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2020-08-21 18:16:23,539 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-21 18:16:23,540 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 32 [2020-08-21 18:16:23,540 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:23,540 INFO L225 Difference]: With dead ends: 39 [2020-08-21 18:16:23,540 INFO L226 Difference]: Without dead ends: 34 [2020-08-21 18:16:23,541 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2020-08-21 18:16:23,542 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-21 18:16:23,553 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-08-21 18:16:23,553 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-21 18:16:23,554 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2020-08-21 18:16:23,556 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 32 [2020-08-21 18:16:23,556 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:23,556 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2020-08-21 18:16:23,556 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-21 18:16:23,557 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2020-08-21 18:16:23,557 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-21 18:16:23,557 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:23,557 INFO L422 BasicCegarLoop]: trace histogram [23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:23,561 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-21 18:16:23,561 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:23,561 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:23,562 INFO L82 PathProgramCache]: Analyzing trace with hash 217916721, now seen corresponding path program 23 times [2020-08-21 18:16:23,562 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:23,562 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [950980776] [2020-08-21 18:16:23,562 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:23,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:24,129 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:24,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:24,133 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:24,133 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [950980776] [2020-08-21 18:16:24,133 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:24,133 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-21 18:16:24,134 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1692222784] [2020-08-21 18:16:24,134 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-21 18:16:24,134 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:24,134 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-21 18:16:24,135 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2020-08-21 18:16:24,135 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 26 states. [2020-08-21 18:16:24,495 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:24,496 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2020-08-21 18:16:24,496 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-21 18:16:24,496 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 33 [2020-08-21 18:16:24,496 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:24,497 INFO L225 Difference]: With dead ends: 40 [2020-08-21 18:16:24,497 INFO L226 Difference]: Without dead ends: 35 [2020-08-21 18:16:24,497 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2020-08-21 18:16:24,498 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-21 18:16:24,501 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-08-21 18:16:24,504 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-21 18:16:24,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-08-21 18:16:24,505 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 33 [2020-08-21 18:16:24,505 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:24,505 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-08-21 18:16:24,505 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-21 18:16:24,506 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-08-21 18:16:24,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-21 18:16:24,506 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:24,506 INFO L422 BasicCegarLoop]: trace histogram [24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:24,506 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-21 18:16:24,508 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:24,509 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:24,509 INFO L82 PathProgramCache]: Analyzing trace with hash -1798054978, now seen corresponding path program 24 times [2020-08-21 18:16:24,509 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:24,509 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1591015981] [2020-08-21 18:16:24,509 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:24,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:25,042 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:25,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:25,045 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:25,046 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1591015981] [2020-08-21 18:16:25,046 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:25,046 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-21 18:16:25,046 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1441572955] [2020-08-21 18:16:25,047 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-21 18:16:25,047 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:25,047 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-21 18:16:25,048 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2020-08-21 18:16:25,048 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 27 states. [2020-08-21 18:16:25,412 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:25,413 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2020-08-21 18:16:25,413 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-21 18:16:25,413 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 34 [2020-08-21 18:16:25,414 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:25,414 INFO L225 Difference]: With dead ends: 41 [2020-08-21 18:16:25,414 INFO L226 Difference]: Without dead ends: 36 [2020-08-21 18:16:25,415 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2020-08-21 18:16:25,415 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-21 18:16:25,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-08-21 18:16:25,419 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-21 18:16:25,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2020-08-21 18:16:25,419 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 34 [2020-08-21 18:16:25,419 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:25,419 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2020-08-21 18:16:25,419 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-21 18:16:25,420 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2020-08-21 18:16:25,420 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-21 18:16:25,420 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:25,420 INFO L422 BasicCegarLoop]: trace histogram [25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:25,420 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-21 18:16:25,420 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:25,420 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:25,421 INFO L82 PathProgramCache]: Analyzing trace with hash 131331793, now seen corresponding path program 25 times [2020-08-21 18:16:25,421 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:25,421 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1421647595] [2020-08-21 18:16:25,421 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:25,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:25,992 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:25,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:25,997 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:25,997 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1421647595] [2020-08-21 18:16:25,998 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:25,998 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-21 18:16:25,998 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1844859879] [2020-08-21 18:16:25,998 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-21 18:16:25,999 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:25,999 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-21 18:16:25,999 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2020-08-21 18:16:25,999 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 28 states. [2020-08-21 18:16:26,408 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:26,409 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2020-08-21 18:16:26,409 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-21 18:16:26,410 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 35 [2020-08-21 18:16:26,410 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:26,410 INFO L225 Difference]: With dead ends: 42 [2020-08-21 18:16:26,411 INFO L226 Difference]: Without dead ends: 37 [2020-08-21 18:16:26,411 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2020-08-21 18:16:26,412 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-21 18:16:26,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-08-21 18:16:26,415 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-21 18:16:26,416 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2020-08-21 18:16:26,416 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 35 [2020-08-21 18:16:26,416 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:26,416 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2020-08-21 18:16:26,416 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-21 18:16:26,417 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2020-08-21 18:16:26,417 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-21 18:16:26,417 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:26,417 INFO L422 BasicCegarLoop]: trace histogram [26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:26,418 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-21 18:16:26,418 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:26,418 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:26,418 INFO L82 PathProgramCache]: Analyzing trace with hash -187220450, now seen corresponding path program 26 times [2020-08-21 18:16:26,418 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:26,419 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [232260155] [2020-08-21 18:16:26,419 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:26,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:26,999 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:27,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:27,005 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:27,005 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [232260155] [2020-08-21 18:16:27,007 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:27,007 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-21 18:16:27,007 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2117417261] [2020-08-21 18:16:27,008 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-21 18:16:27,008 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:27,008 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-21 18:16:27,009 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=731, Unknown=0, NotChecked=0, Total=812 [2020-08-21 18:16:27,009 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 29 states. [2020-08-21 18:16:27,484 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:27,484 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2020-08-21 18:16:27,485 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-21 18:16:27,485 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 36 [2020-08-21 18:16:27,485 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:27,486 INFO L225 Difference]: With dead ends: 43 [2020-08-21 18:16:27,486 INFO L226 Difference]: Without dead ends: 38 [2020-08-21 18:16:27,486 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=81, Invalid=731, Unknown=0, NotChecked=0, Total=812 [2020-08-21 18:16:27,487 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-21 18:16:27,491 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-08-21 18:16:27,491 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-21 18:16:27,499 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2020-08-21 18:16:27,499 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 36 [2020-08-21 18:16:27,499 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:27,500 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2020-08-21 18:16:27,500 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-21 18:16:27,500 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2020-08-21 18:16:27,500 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-21 18:16:27,500 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:27,501 INFO L422 BasicCegarLoop]: trace histogram [27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:27,501 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-21 18:16:27,501 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:27,501 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:27,501 INFO L82 PathProgramCache]: Analyzing trace with hash -1472405391, now seen corresponding path program 27 times [2020-08-21 18:16:27,502 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:27,504 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1987351704] [2020-08-21 18:16:27,504 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:27,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:28,150 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:28,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:28,155 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:28,155 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1987351704] [2020-08-21 18:16:28,155 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:28,155 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-21 18:16:28,156 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [825436916] [2020-08-21 18:16:28,156 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-21 18:16:28,156 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:28,156 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-21 18:16:28,157 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2020-08-21 18:16:28,157 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 30 states. [2020-08-21 18:16:28,629 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:28,630 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-08-21 18:16:28,635 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-21 18:16:28,636 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 37 [2020-08-21 18:16:28,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:28,636 INFO L225 Difference]: With dead ends: 44 [2020-08-21 18:16:28,636 INFO L226 Difference]: Without dead ends: 39 [2020-08-21 18:16:28,637 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2020-08-21 18:16:28,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-21 18:16:28,640 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-21 18:16:28,640 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-21 18:16:28,641 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2020-08-21 18:16:28,641 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 37 [2020-08-21 18:16:28,641 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:28,641 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2020-08-21 18:16:28,641 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-21 18:16:28,641 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2020-08-21 18:16:28,642 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-21 18:16:28,642 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:28,642 INFO L422 BasicCegarLoop]: trace histogram [28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:28,642 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-21 18:16:28,642 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:28,643 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:28,643 INFO L82 PathProgramCache]: Analyzing trace with hash 1636534398, now seen corresponding path program 28 times [2020-08-21 18:16:28,643 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:28,643 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [308925201] [2020-08-21 18:16:28,643 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:28,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:29,317 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:29,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:29,321 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:29,321 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [308925201] [2020-08-21 18:16:29,321 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:29,321 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-21 18:16:29,322 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [685401414] [2020-08-21 18:16:29,322 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-21 18:16:29,322 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:29,322 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-21 18:16:29,323 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2020-08-21 18:16:29,323 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 31 states. [2020-08-21 18:16:29,859 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:29,860 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2020-08-21 18:16:29,860 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-21 18:16:29,860 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 38 [2020-08-21 18:16:29,861 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:29,861 INFO L225 Difference]: With dead ends: 45 [2020-08-21 18:16:29,862 INFO L226 Difference]: Without dead ends: 40 [2020-08-21 18:16:29,863 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2020-08-21 18:16:29,863 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-21 18:16:29,867 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-08-21 18:16:29,867 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-21 18:16:29,868 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2020-08-21 18:16:29,868 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 38 [2020-08-21 18:16:29,868 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:29,868 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2020-08-21 18:16:29,868 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-21 18:16:29,868 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2020-08-21 18:16:29,869 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-21 18:16:29,869 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:29,869 INFO L422 BasicCegarLoop]: trace histogram [29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:29,869 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-21 18:16:29,870 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:29,870 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:29,870 INFO L82 PathProgramCache]: Analyzing trace with hash -770579951, now seen corresponding path program 29 times [2020-08-21 18:16:29,870 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:29,870 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1851645387] [2020-08-21 18:16:29,870 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:29,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:30,595 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:30,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:30,600 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:30,600 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1851645387] [2020-08-21 18:16:30,600 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:30,600 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-21 18:16:30,601 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [239201641] [2020-08-21 18:16:30,601 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-21 18:16:30,601 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:30,601 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-21 18:16:30,602 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=902, Unknown=0, NotChecked=0, Total=992 [2020-08-21 18:16:30,602 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 32 states. [2020-08-21 18:16:31,166 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:31,167 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2020-08-21 18:16:31,173 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-21 18:16:31,173 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 39 [2020-08-21 18:16:31,173 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:31,174 INFO L225 Difference]: With dead ends: 46 [2020-08-21 18:16:31,174 INFO L226 Difference]: Without dead ends: 41 [2020-08-21 18:16:31,175 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=90, Invalid=902, Unknown=0, NotChecked=0, Total=992 [2020-08-21 18:16:31,175 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-21 18:16:31,179 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-21 18:16:31,179 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-21 18:16:31,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-08-21 18:16:31,179 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 39 [2020-08-21 18:16:31,180 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:31,180 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-08-21 18:16:31,180 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-21 18:16:31,180 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-08-21 18:16:31,180 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-21 18:16:31,180 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:31,181 INFO L422 BasicCegarLoop]: trace histogram [30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:31,181 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-21 18:16:31,181 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:31,181 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:31,181 INFO L82 PathProgramCache]: Analyzing trace with hash 1918286558, now seen corresponding path program 30 times [2020-08-21 18:16:31,182 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:31,182 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1333228393] [2020-08-21 18:16:31,182 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:31,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:31,924 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:31,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:31,928 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:31,929 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1333228393] [2020-08-21 18:16:31,929 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:31,929 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-21 18:16:31,929 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [668431039] [2020-08-21 18:16:31,930 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-21 18:16:31,930 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:31,930 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-21 18:16:31,930 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2020-08-21 18:16:31,931 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 33 states. [2020-08-21 18:16:32,554 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:32,555 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2020-08-21 18:16:32,557 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-21 18:16:32,557 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 40 [2020-08-21 18:16:32,558 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:32,558 INFO L225 Difference]: With dead ends: 47 [2020-08-21 18:16:32,558 INFO L226 Difference]: Without dead ends: 42 [2020-08-21 18:16:32,559 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2020-08-21 18:16:32,559 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-21 18:16:32,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-08-21 18:16:32,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-21 18:16:32,563 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2020-08-21 18:16:32,563 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 40 [2020-08-21 18:16:32,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:32,564 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2020-08-21 18:16:32,564 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-21 18:16:32,564 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2020-08-21 18:16:32,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-21 18:16:32,564 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:32,564 INFO L422 BasicCegarLoop]: trace histogram [31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:32,565 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-21 18:16:32,565 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:32,565 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:32,565 INFO L82 PathProgramCache]: Analyzing trace with hash -626197583, now seen corresponding path program 31 times [2020-08-21 18:16:32,565 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:32,566 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [760369173] [2020-08-21 18:16:32,566 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:32,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:33,376 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:33,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:33,381 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:33,382 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [760369173] [2020-08-21 18:16:33,382 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:33,382 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-21 18:16:33,382 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [69449071] [2020-08-21 18:16:33,382 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-21 18:16:33,383 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:33,383 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-21 18:16:33,383 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2020-08-21 18:16:33,384 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 34 states. [2020-08-21 18:16:34,049 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:34,050 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2020-08-21 18:16:34,050 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-21 18:16:34,051 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 41 [2020-08-21 18:16:34,051 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:34,051 INFO L225 Difference]: With dead ends: 48 [2020-08-21 18:16:34,051 INFO L226 Difference]: Without dead ends: 43 [2020-08-21 18:16:34,052 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2020-08-21 18:16:34,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-21 18:16:34,056 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-21 18:16:34,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-21 18:16:34,056 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2020-08-21 18:16:34,057 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 41 [2020-08-21 18:16:34,057 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:34,057 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2020-08-21 18:16:34,057 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-21 18:16:34,057 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2020-08-21 18:16:34,057 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-21 18:16:34,058 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:34,058 INFO L422 BasicCegarLoop]: trace histogram [32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:34,058 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-21 18:16:34,058 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:34,058 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:34,058 INFO L82 PathProgramCache]: Analyzing trace with hash 2099172670, now seen corresponding path program 32 times [2020-08-21 18:16:34,059 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:34,059 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [639427135] [2020-08-21 18:16:34,059 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:34,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:34,904 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:34,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:34,908 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:34,908 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [639427135] [2020-08-21 18:16:34,908 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:34,909 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-21 18:16:34,909 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1003509497] [2020-08-21 18:16:34,909 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-21 18:16:34,909 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:34,910 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-21 18:16:34,910 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=1091, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 18:16:34,910 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 35 states. [2020-08-21 18:16:35,602 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:35,602 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2020-08-21 18:16:35,603 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-21 18:16:35,603 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 42 [2020-08-21 18:16:35,603 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:35,604 INFO L225 Difference]: With dead ends: 49 [2020-08-21 18:16:35,604 INFO L226 Difference]: Without dead ends: 44 [2020-08-21 18:16:35,605 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=99, Invalid=1091, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 18:16:35,606 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-21 18:16:35,608 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-08-21 18:16:35,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-21 18:16:35,608 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2020-08-21 18:16:35,608 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 42 [2020-08-21 18:16:35,609 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:35,609 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2020-08-21 18:16:35,609 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-21 18:16:35,609 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2020-08-21 18:16:35,609 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-21 18:16:35,617 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:35,617 INFO L422 BasicCegarLoop]: trace histogram [33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:35,617 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-21 18:16:35,617 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:35,617 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:35,618 INFO L82 PathProgramCache]: Analyzing trace with hash 686304593, now seen corresponding path program 33 times [2020-08-21 18:16:35,618 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:35,618 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1792044570] [2020-08-21 18:16:35,618 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:35,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:36,485 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:36,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:36,490 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:36,490 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1792044570] [2020-08-21 18:16:36,490 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:36,490 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-21 18:16:36,491 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1186318019] [2020-08-21 18:16:36,491 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-21 18:16:36,491 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:36,491 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-21 18:16:36,492 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2020-08-21 18:16:36,492 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 36 states. [2020-08-21 18:16:37,199 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:37,199 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-08-21 18:16:37,200 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-21 18:16:37,200 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 43 [2020-08-21 18:16:37,200 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:37,200 INFO L225 Difference]: With dead ends: 50 [2020-08-21 18:16:37,201 INFO L226 Difference]: Without dead ends: 45 [2020-08-21 18:16:37,202 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2020-08-21 18:16:37,202 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-21 18:16:37,204 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-08-21 18:16:37,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-21 18:16:37,205 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2020-08-21 18:16:37,205 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 43 [2020-08-21 18:16:37,205 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:37,205 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2020-08-21 18:16:37,206 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-21 18:16:37,206 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2020-08-21 18:16:37,206 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-21 18:16:37,206 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:37,206 INFO L422 BasicCegarLoop]: trace histogram [34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:37,207 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-21 18:16:37,207 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:37,207 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:37,207 INFO L82 PathProgramCache]: Analyzing trace with hash -162932834, now seen corresponding path program 34 times [2020-08-21 18:16:37,207 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:37,207 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2069905901] [2020-08-21 18:16:37,207 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:37,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:38,111 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:38,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:38,116 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:38,117 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2069905901] [2020-08-21 18:16:38,117 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:38,117 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-21 18:16:38,117 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [361706852] [2020-08-21 18:16:38,118 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-21 18:16:38,118 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:38,118 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-21 18:16:38,119 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=1227, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 18:16:38,119 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 37 states. [2020-08-21 18:16:38,881 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:38,881 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2020-08-21 18:16:38,882 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-21 18:16:38,882 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 44 [2020-08-21 18:16:38,882 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:38,884 INFO L225 Difference]: With dead ends: 51 [2020-08-21 18:16:38,884 INFO L226 Difference]: Without dead ends: 46 [2020-08-21 18:16:38,885 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=105, Invalid=1227, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 18:16:38,885 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-21 18:16:38,888 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-08-21 18:16:38,888 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-21 18:16:38,891 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2020-08-21 18:16:38,891 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 44 [2020-08-21 18:16:38,891 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:38,891 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2020-08-21 18:16:38,891 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-21 18:16:38,891 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2020-08-21 18:16:38,892 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-21 18:16:38,892 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:38,892 INFO L422 BasicCegarLoop]: trace histogram [35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:38,892 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-21 18:16:38,892 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:38,893 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:38,893 INFO L82 PathProgramCache]: Analyzing trace with hash -719489295, now seen corresponding path program 35 times [2020-08-21 18:16:38,893 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:38,893 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [497514220] [2020-08-21 18:16:38,893 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:38,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:40,221 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:40,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:40,229 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:40,229 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [497514220] [2020-08-21 18:16:40,229 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:40,230 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-21 18:16:40,230 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1101730180] [2020-08-21 18:16:40,230 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-21 18:16:40,231 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:40,231 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-21 18:16:40,232 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=1298, Unknown=0, NotChecked=0, Total=1406 [2020-08-21 18:16:40,232 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand 38 states. [2020-08-21 18:16:41,008 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:41,008 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2020-08-21 18:16:41,008 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-21 18:16:41,009 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 45 [2020-08-21 18:16:41,009 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:41,009 INFO L225 Difference]: With dead ends: 52 [2020-08-21 18:16:41,010 INFO L226 Difference]: Without dead ends: 47 [2020-08-21 18:16:41,010 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=108, Invalid=1298, Unknown=0, NotChecked=0, Total=1406 [2020-08-21 18:16:41,011 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-21 18:16:41,013 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-08-21 18:16:41,014 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-21 18:16:41,014 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2020-08-21 18:16:41,014 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 45 [2020-08-21 18:16:41,015 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:41,015 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2020-08-21 18:16:41,015 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-21 18:16:41,015 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2020-08-21 18:16:41,015 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-21 18:16:41,015 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:41,016 INFO L422 BasicCegarLoop]: trace histogram [36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:41,016 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-21 18:16:41,016 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:41,016 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:41,016 INFO L82 PathProgramCache]: Analyzing trace with hash -792870402, now seen corresponding path program 36 times [2020-08-21 18:16:41,017 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:41,017 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1124985559] [2020-08-21 18:16:41,017 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:41,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:42,024 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:42,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:42,030 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:42,030 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1124985559] [2020-08-21 18:16:42,030 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:42,030 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-21 18:16:42,030 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1896494817] [2020-08-21 18:16:42,030 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-21 18:16:42,031 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:42,031 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-21 18:16:42,031 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 18:16:42,032 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 39 states. [2020-08-21 18:16:42,886 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:42,886 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2020-08-21 18:16:42,888 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-21 18:16:42,888 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 46 [2020-08-21 18:16:42,888 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:42,889 INFO L225 Difference]: With dead ends: 53 [2020-08-21 18:16:42,889 INFO L226 Difference]: Without dead ends: 48 [2020-08-21 18:16:42,890 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 18:16:42,890 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-21 18:16:42,893 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-08-21 18:16:42,893 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-21 18:16:42,893 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2020-08-21 18:16:42,894 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 46 [2020-08-21 18:16:42,894 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:42,894 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2020-08-21 18:16:42,894 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-21 18:16:42,894 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2020-08-21 18:16:42,895 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-21 18:16:42,895 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:42,895 INFO L422 BasicCegarLoop]: trace histogram [37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:42,895 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-21 18:16:42,895 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:42,895 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:42,896 INFO L82 PathProgramCache]: Analyzing trace with hash 1227282577, now seen corresponding path program 37 times [2020-08-21 18:16:42,896 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:42,896 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1840817012] [2020-08-21 18:16:42,896 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:42,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:43,951 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:43,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:43,957 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:43,957 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1840817012] [2020-08-21 18:16:43,958 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:43,958 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-21 18:16:43,958 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1486109938] [2020-08-21 18:16:43,959 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-21 18:16:43,959 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:43,960 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-21 18:16:43,960 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=1446, Unknown=0, NotChecked=0, Total=1560 [2020-08-21 18:16:43,960 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 40 states. [2020-08-21 18:16:44,852 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:44,853 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2020-08-21 18:16:44,853 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-21 18:16:44,853 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 47 [2020-08-21 18:16:44,854 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:44,854 INFO L225 Difference]: With dead ends: 54 [2020-08-21 18:16:44,854 INFO L226 Difference]: Without dead ends: 49 [2020-08-21 18:16:44,855 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=114, Invalid=1446, Unknown=0, NotChecked=0, Total=1560 [2020-08-21 18:16:44,856 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-21 18:16:44,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-21 18:16:44,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-21 18:16:44,860 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2020-08-21 18:16:44,860 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 47 [2020-08-21 18:16:44,860 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:44,860 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2020-08-21 18:16:44,860 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-21 18:16:44,860 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2020-08-21 18:16:44,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-21 18:16:44,861 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:44,861 INFO L422 BasicCegarLoop]: trace histogram [38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:44,861 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-21 18:16:44,861 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:44,862 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:44,862 INFO L82 PathProgramCache]: Analyzing trace with hash -572484514, now seen corresponding path program 38 times [2020-08-21 18:16:44,862 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:44,862 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [700791695] [2020-08-21 18:16:44,862 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:44,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:45,963 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:45,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:45,969 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:45,969 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [700791695] [2020-08-21 18:16:45,969 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:45,970 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-21 18:16:45,970 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1527341768] [2020-08-21 18:16:45,970 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-21 18:16:45,970 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:45,970 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-21 18:16:45,971 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=1523, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 18:16:45,971 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 41 states. [2020-08-21 18:16:46,933 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:46,933 INFO L93 Difference]: Finished difference Result 55 states and 55 transitions. [2020-08-21 18:16:46,933 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-21 18:16:46,934 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 48 [2020-08-21 18:16:46,934 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:46,935 INFO L225 Difference]: With dead ends: 55 [2020-08-21 18:16:46,935 INFO L226 Difference]: Without dead ends: 50 [2020-08-21 18:16:46,936 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=117, Invalid=1523, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 18:16:46,936 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-08-21 18:16:46,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2020-08-21 18:16:46,939 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-08-21 18:16:46,940 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2020-08-21 18:16:46,940 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 48 [2020-08-21 18:16:46,940 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:46,940 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2020-08-21 18:16:46,940 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-21 18:16:46,941 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2020-08-21 18:16:46,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-08-21 18:16:46,941 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:46,941 INFO L422 BasicCegarLoop]: trace histogram [39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:46,941 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-21 18:16:46,941 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:46,942 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:46,942 INFO L82 PathProgramCache]: Analyzing trace with hash -530689487, now seen corresponding path program 39 times [2020-08-21 18:16:46,942 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:46,942 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1284191349] [2020-08-21 18:16:46,942 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:46,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:48,117 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:48,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:48,122 INFO L134 CoverageAnalysis]: Checked inductivity of 780 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:48,122 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1284191349] [2020-08-21 18:16:48,122 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:48,122 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-21 18:16:48,122 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1625184048] [2020-08-21 18:16:48,124 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-21 18:16:48,124 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:48,124 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-21 18:16:48,124 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=1602, Unknown=0, NotChecked=0, Total=1722 [2020-08-21 18:16:48,124 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand 42 states. [2020-08-21 18:16:49,139 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:49,139 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2020-08-21 18:16:49,140 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-21 18:16:49,140 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 49 [2020-08-21 18:16:49,140 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:49,141 INFO L225 Difference]: With dead ends: 56 [2020-08-21 18:16:49,141 INFO L226 Difference]: Without dead ends: 51 [2020-08-21 18:16:49,142 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=120, Invalid=1602, Unknown=0, NotChecked=0, Total=1722 [2020-08-21 18:16:49,142 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-08-21 18:16:49,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2020-08-21 18:16:49,145 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-21 18:16:49,145 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2020-08-21 18:16:49,145 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 49 [2020-08-21 18:16:49,145 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:49,145 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2020-08-21 18:16:49,146 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-21 18:16:49,146 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2020-08-21 18:16:49,146 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-21 18:16:49,146 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:49,146 INFO L422 BasicCegarLoop]: trace histogram [40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:49,146 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-21 18:16:49,146 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:49,146 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:49,147 INFO L82 PathProgramCache]: Analyzing trace with hash 764956350, now seen corresponding path program 40 times [2020-08-21 18:16:49,147 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:49,147 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1975856352] [2020-08-21 18:16:49,147 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:49,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:50,499 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:50,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:50,504 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 0 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:50,504 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1975856352] [2020-08-21 18:16:50,504 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:50,505 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-21 18:16:50,505 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [331257990] [2020-08-21 18:16:50,505 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-21 18:16:50,505 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:50,506 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-21 18:16:50,506 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=1683, Unknown=0, NotChecked=0, Total=1806 [2020-08-21 18:16:50,506 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 43 states. [2020-08-21 18:16:51,568 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:51,569 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2020-08-21 18:16:51,569 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-21 18:16:51,569 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 50 [2020-08-21 18:16:51,570 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:51,570 INFO L225 Difference]: With dead ends: 57 [2020-08-21 18:16:51,570 INFO L226 Difference]: Without dead ends: 52 [2020-08-21 18:16:51,571 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=123, Invalid=1683, Unknown=0, NotChecked=0, Total=1806 [2020-08-21 18:16:51,571 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-21 18:16:51,574 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2020-08-21 18:16:51,575 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-21 18:16:51,575 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2020-08-21 18:16:51,575 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 50 [2020-08-21 18:16:51,575 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:51,576 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2020-08-21 18:16:51,576 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-21 18:16:51,576 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2020-08-21 18:16:51,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-08-21 18:16:51,576 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:51,576 INFO L422 BasicCegarLoop]: trace histogram [41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:51,577 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-21 18:16:51,577 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:51,577 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:51,577 INFO L82 PathProgramCache]: Analyzing trace with hash -2019695663, now seen corresponding path program 41 times [2020-08-21 18:16:51,577 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:51,577 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1497794255] [2020-08-21 18:16:51,578 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:51,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:52,912 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:52,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:52,918 INFO L134 CoverageAnalysis]: Checked inductivity of 861 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:52,918 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1497794255] [2020-08-21 18:16:52,918 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:52,918 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-08-21 18:16:52,918 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [186015998] [2020-08-21 18:16:52,919 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-08-21 18:16:52,919 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:52,919 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-08-21 18:16:52,920 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=1766, Unknown=0, NotChecked=0, Total=1892 [2020-08-21 18:16:52,920 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 44 states. [2020-08-21 18:16:54,064 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:54,064 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2020-08-21 18:16:54,065 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-08-21 18:16:54,065 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 51 [2020-08-21 18:16:54,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:54,066 INFO L225 Difference]: With dead ends: 58 [2020-08-21 18:16:54,066 INFO L226 Difference]: Without dead ends: 53 [2020-08-21 18:16:54,067 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=126, Invalid=1766, Unknown=0, NotChecked=0, Total=1892 [2020-08-21 18:16:54,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-21 18:16:54,070 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2020-08-21 18:16:54,070 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-21 18:16:54,071 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2020-08-21 18:16:54,071 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 51 [2020-08-21 18:16:54,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:54,071 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2020-08-21 18:16:54,071 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-08-21 18:16:54,071 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2020-08-21 18:16:54,072 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-21 18:16:54,072 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:54,072 INFO L422 BasicCegarLoop]: trace histogram [42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:54,072 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-21 18:16:54,072 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:54,073 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:54,073 INFO L82 PathProgramCache]: Analyzing trace with hash 1850405150, now seen corresponding path program 42 times [2020-08-21 18:16:54,073 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:54,073 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1219849976] [2020-08-21 18:16:54,073 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:54,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:55,389 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:55,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:55,401 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 0 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:55,401 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1219849976] [2020-08-21 18:16:55,401 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:55,404 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-08-21 18:16:55,405 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [908127331] [2020-08-21 18:16:55,405 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-08-21 18:16:55,405 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:55,405 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-08-21 18:16:55,406 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=1851, Unknown=0, NotChecked=0, Total=1980 [2020-08-21 18:16:55,406 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 45 states. [2020-08-21 18:16:56,569 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:56,569 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2020-08-21 18:16:56,572 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-08-21 18:16:56,572 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 52 [2020-08-21 18:16:56,572 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:56,572 INFO L225 Difference]: With dead ends: 59 [2020-08-21 18:16:56,572 INFO L226 Difference]: Without dead ends: 54 [2020-08-21 18:16:56,573 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=129, Invalid=1851, Unknown=0, NotChecked=0, Total=1980 [2020-08-21 18:16:56,574 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-21 18:16:56,576 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2020-08-21 18:16:56,577 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-21 18:16:56,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2020-08-21 18:16:56,577 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 52 [2020-08-21 18:16:56,577 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:56,577 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2020-08-21 18:16:56,578 INFO L480 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-08-21 18:16:56,578 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2020-08-21 18:16:56,578 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-08-21 18:16:56,578 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:56,578 INFO L422 BasicCegarLoop]: trace histogram [43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:56,579 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2020-08-21 18:16:56,579 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:56,579 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:56,579 INFO L82 PathProgramCache]: Analyzing trace with hash 1564446065, now seen corresponding path program 43 times [2020-08-21 18:16:56,579 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:56,579 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [842424659] [2020-08-21 18:16:56,579 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:56,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:57,948 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:16:57,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:16:57,954 INFO L134 CoverageAnalysis]: Checked inductivity of 946 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:16:57,955 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [842424659] [2020-08-21 18:16:57,955 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:16:57,955 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46] total 46 [2020-08-21 18:16:57,955 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1981566301] [2020-08-21 18:16:57,955 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-08-21 18:16:57,955 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:16:57,956 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-08-21 18:16:57,956 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=1938, Unknown=0, NotChecked=0, Total=2070 [2020-08-21 18:16:57,957 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand 46 states. [2020-08-21 18:16:59,164 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:16:59,164 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2020-08-21 18:16:59,164 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-08-21 18:16:59,165 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 53 [2020-08-21 18:16:59,165 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:16:59,166 INFO L225 Difference]: With dead ends: 60 [2020-08-21 18:16:59,166 INFO L226 Difference]: Without dead ends: 55 [2020-08-21 18:16:59,166 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=132, Invalid=1938, Unknown=0, NotChecked=0, Total=2070 [2020-08-21 18:16:59,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-21 18:16:59,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2020-08-21 18:16:59,169 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-21 18:16:59,169 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2020-08-21 18:16:59,169 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 53 [2020-08-21 18:16:59,169 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:16:59,169 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2020-08-21 18:16:59,170 INFO L480 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-08-21 18:16:59,170 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2020-08-21 18:16:59,170 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-21 18:16:59,170 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:16:59,170 INFO L422 BasicCegarLoop]: trace histogram [44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:16:59,170 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2020-08-21 18:16:59,171 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:16:59,171 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:16:59,171 INFO L82 PathProgramCache]: Analyzing trace with hash 1289649022, now seen corresponding path program 44 times [2020-08-21 18:16:59,171 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:16:59,171 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1769316340] [2020-08-21 18:16:59,171 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:16:59,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:17:00,667 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:17:00,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:17:00,673 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:17:00,674 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1769316340] [2020-08-21 18:17:00,674 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:17:00,674 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47] total 47 [2020-08-21 18:17:00,674 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [238165557] [2020-08-21 18:17:00,674 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-08-21 18:17:00,674 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:17:00,675 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-08-21 18:17:00,675 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=2027, Unknown=0, NotChecked=0, Total=2162 [2020-08-21 18:17:00,675 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 47 states. [2020-08-21 18:17:01,981 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:17:01,981 INFO L93 Difference]: Finished difference Result 61 states and 61 transitions. [2020-08-21 18:17:01,982 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2020-08-21 18:17:01,982 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 54 [2020-08-21 18:17:01,982 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:17:01,983 INFO L225 Difference]: With dead ends: 61 [2020-08-21 18:17:01,983 INFO L226 Difference]: Without dead ends: 56 [2020-08-21 18:17:01,984 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=135, Invalid=2027, Unknown=0, NotChecked=0, Total=2162 [2020-08-21 18:17:01,984 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-21 18:17:01,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2020-08-21 18:17:01,988 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-08-21 18:17:01,988 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 56 transitions. [2020-08-21 18:17:01,989 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 56 transitions. Word has length 54 [2020-08-21 18:17:01,989 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:17:01,989 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 56 transitions. [2020-08-21 18:17:01,989 INFO L480 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-08-21 18:17:01,989 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 56 transitions. [2020-08-21 18:17:01,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-08-21 18:17:01,990 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:17:01,990 INFO L422 BasicCegarLoop]: trace histogram [45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:17:01,990 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2020-08-21 18:17:01,990 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:17:01,990 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:17:01,991 INFO L82 PathProgramCache]: Analyzing trace with hash 1360875281, now seen corresponding path program 45 times [2020-08-21 18:17:01,991 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:17:01,991 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1829533339] [2020-08-21 18:17:01,991 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:17:02,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:17:03,504 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:17:03,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:17:03,511 INFO L134 CoverageAnalysis]: Checked inductivity of 1035 backedges. 0 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:17:03,511 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1829533339] [2020-08-21 18:17:03,511 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:17:03,511 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48] total 48 [2020-08-21 18:17:03,512 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1563843517] [2020-08-21 18:17:03,512 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-08-21 18:17:03,512 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:17:03,512 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-08-21 18:17:03,513 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=2118, Unknown=0, NotChecked=0, Total=2256 [2020-08-21 18:17:03,513 INFO L87 Difference]: Start difference. First operand 56 states and 56 transitions. Second operand 48 states. [2020-08-21 18:17:04,853 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:17:04,853 INFO L93 Difference]: Finished difference Result 62 states and 62 transitions. [2020-08-21 18:17:04,854 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-08-21 18:17:04,854 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 55 [2020-08-21 18:17:04,854 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:17:04,855 INFO L225 Difference]: With dead ends: 62 [2020-08-21 18:17:04,855 INFO L226 Difference]: Without dead ends: 57 [2020-08-21 18:17:04,855 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=138, Invalid=2118, Unknown=0, NotChecked=0, Total=2256 [2020-08-21 18:17:04,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-08-21 18:17:04,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2020-08-21 18:17:04,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-21 18:17:04,860 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2020-08-21 18:17:04,860 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 55 [2020-08-21 18:17:04,860 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:17:04,860 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2020-08-21 18:17:04,861 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-08-21 18:17:04,861 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2020-08-21 18:17:04,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-21 18:17:04,861 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:17:04,861 INFO L422 BasicCegarLoop]: trace histogram [46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:17:04,861 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2020-08-21 18:17:04,862 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:17:04,862 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:17:04,862 INFO L82 PathProgramCache]: Analyzing trace with hash -726077986, now seen corresponding path program 46 times [2020-08-21 18:17:04,862 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:17:04,862 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [529089308] [2020-08-21 18:17:04,862 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:17:04,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:17:06,474 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:17:06,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:17:06,480 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:17:06,481 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [529089308] [2020-08-21 18:17:06,481 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:17:06,481 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49] total 49 [2020-08-21 18:17:06,481 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1209666013] [2020-08-21 18:17:06,481 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2020-08-21 18:17:06,481 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:17:06,482 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2020-08-21 18:17:06,482 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=2211, Unknown=0, NotChecked=0, Total=2352 [2020-08-21 18:17:06,482 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 49 states. [2020-08-21 18:17:07,878 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:17:07,879 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2020-08-21 18:17:07,879 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2020-08-21 18:17:07,880 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 56 [2020-08-21 18:17:07,880 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:17:07,880 INFO L225 Difference]: With dead ends: 63 [2020-08-21 18:17:07,881 INFO L226 Difference]: Without dead ends: 58 [2020-08-21 18:17:07,881 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=141, Invalid=2211, Unknown=0, NotChecked=0, Total=2352 [2020-08-21 18:17:07,882 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-21 18:17:07,885 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2020-08-21 18:17:07,885 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-08-21 18:17:07,886 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 58 transitions. [2020-08-21 18:17:07,886 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 58 transitions. Word has length 56 [2020-08-21 18:17:07,886 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:17:07,886 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 58 transitions. [2020-08-21 18:17:07,886 INFO L480 AbstractCegarLoop]: Interpolant automaton has 49 states. [2020-08-21 18:17:07,886 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 58 transitions. [2020-08-21 18:17:07,887 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-08-21 18:17:07,887 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:17:07,887 INFO L422 BasicCegarLoop]: trace histogram [47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:17:07,887 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2020-08-21 18:17:07,887 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:17:07,887 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:17:07,888 INFO L82 PathProgramCache]: Analyzing trace with hash -997119823, now seen corresponding path program 47 times [2020-08-21 18:17:07,888 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:17:07,888 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [162409859] [2020-08-21 18:17:07,888 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:17:07,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:17:09,488 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:17:09,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:17:09,495 INFO L134 CoverageAnalysis]: Checked inductivity of 1128 backedges. 0 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:17:09,495 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [162409859] [2020-08-21 18:17:09,495 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:17:09,495 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50] total 50 [2020-08-21 18:17:09,495 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [115891444] [2020-08-21 18:17:09,496 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-08-21 18:17:09,496 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:17:09,496 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-08-21 18:17:09,496 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=2306, Unknown=0, NotChecked=0, Total=2450 [2020-08-21 18:17:09,496 INFO L87 Difference]: Start difference. First operand 58 states and 58 transitions. Second operand 50 states. [2020-08-21 18:17:10,958 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:17:10,959 INFO L93 Difference]: Finished difference Result 64 states and 64 transitions. [2020-08-21 18:17:10,965 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2020-08-21 18:17:10,965 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 57 [2020-08-21 18:17:10,965 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:17:10,966 INFO L225 Difference]: With dead ends: 64 [2020-08-21 18:17:10,966 INFO L226 Difference]: Without dead ends: 59 [2020-08-21 18:17:10,967 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=144, Invalid=2306, Unknown=0, NotChecked=0, Total=2450 [2020-08-21 18:17:10,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-08-21 18:17:10,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2020-08-21 18:17:10,971 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-08-21 18:17:10,971 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2020-08-21 18:17:10,972 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 57 [2020-08-21 18:17:10,972 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:17:10,972 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2020-08-21 18:17:10,972 INFO L480 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-08-21 18:17:10,972 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2020-08-21 18:17:10,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-08-21 18:17:10,973 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:17:10,973 INFO L422 BasicCegarLoop]: trace histogram [48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:17:10,973 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2020-08-21 18:17:10,973 INFO L427 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:17:10,973 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:17:10,974 INFO L82 PathProgramCache]: Analyzing trace with hash -809482178, now seen corresponding path program 48 times [2020-08-21 18:17:10,974 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:17:10,974 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [657863469] [2020-08-21 18:17:10,974 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:17:10,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat