/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=5 --traceabstraction.additional.smt.options interpolation-heuristic=WIDEST -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/simple_4-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-18 22:50:57,817 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 22:50:57,821 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 22:50:57,861 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-18 22:50:57,861 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-18 22:50:57,874 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-18 22:50:57,876 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-18 22:50:57,878 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-18 22:50:57,881 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-18 22:50:57,882 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-18 22:50:57,883 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-18 22:50:57,887 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-18 22:50:57,887 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 22:50:57,890 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 22:50:57,891 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 22:50:57,893 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 22:50:57,895 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 22:50:57,897 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 22:50:57,899 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 22:50:57,905 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 22:50:57,906 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 22:50:57,907 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 22:50:57,908 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 22:50:57,909 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 22:50:57,911 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-18 22:50:57,912 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-18 22:50:57,912 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-18 22:50:57,913 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-18 22:50:57,913 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-18 22:50:57,914 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-18 22:50:57,914 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-18 22:50:57,915 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-18 22:50:57,915 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-18 22:50:57,916 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-18 22:50:57,917 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-18 22:50:57,917 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-18 22:50:57,918 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-18 22:50:57,918 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-18 22:50:57,918 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 22:50:57,919 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 22:50:57,920 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 22:50:57,920 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 [2020-08-18 22:50:57,943 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 22:50:57,943 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 22:50:57,944 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 22:50:57,944 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 22:50:57,945 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 22:50:57,945 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 22:50:57,945 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 22:50:57,945 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 22:50:57,945 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 22:50:57,946 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 22:50:57,946 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 22:50:57,946 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 22:50:57,946 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 22:50:57,946 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 22:50:57,947 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 22:50:57,947 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 22:50:57,947 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 22:50:57,947 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 22:50:57,947 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 22:50:57,948 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 22:50:57,948 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 22:50:57,948 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 22:50:57,948 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 22:50:57,948 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 22:50:57,949 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 22:50:57,949 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 22:50:57,949 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 22:50:57,949 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 22:50:57,949 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 22:50:57,950 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=5;interpolation-heuristic=WIDEST; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=WIDEST; [2020-08-18 22:50:58,246 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 22:50:58,269 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 22:50:58,274 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 22:50:58,276 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 22:50:58,277 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 22:50:58,278 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/simple_4-2.c [2020-08-18 22:50:58,341 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/f14092d55/57cd03adc7094f9c9668acb4fa645cdc/FLAGc3dde9cad [2020-08-18 22:50:58,823 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 22:50:58,824 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-acceleration/simple_4-2.c [2020-08-18 22:50:58,830 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/f14092d55/57cd03adc7094f9c9668acb4fa645cdc/FLAGc3dde9cad [2020-08-18 22:50:59,198 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/f14092d55/57cd03adc7094f9c9668acb4fa645cdc [2020-08-18 22:50:59,209 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 22:50:59,211 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 22:50:59,212 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 22:50:59,213 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 22:50:59,216 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 22:50:59,218 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 10:50:59" (1/1) ... [2020-08-18 22:50:59,221 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1a80087b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:50:59, skipping insertion in model container [2020-08-18 22:50:59,221 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 10:50:59" (1/1) ... [2020-08-18 22:50:59,230 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 22:50:59,248 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 22:50:59,438 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 22:50:59,445 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 22:50:59,464 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 22:50:59,483 INFO L208 MainTranslator]: Completed translation [2020-08-18 22:50:59,484 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:50:59 WrapperNode [2020-08-18 22:50:59,484 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 22:50:59,485 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 22:50:59,485 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 22:50:59,485 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 22:50:59,495 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:50:59" (1/1) ... [2020-08-18 22:50:59,495 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:50:59" (1/1) ... [2020-08-18 22:50:59,500 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:50:59" (1/1) ... [2020-08-18 22:50:59,500 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:50:59" (1/1) ... [2020-08-18 22:50:59,596 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:50:59" (1/1) ... [2020-08-18 22:50:59,601 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:50:59" (1/1) ... [2020-08-18 22:50:59,603 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:50:59" (1/1) ... [2020-08-18 22:50:59,605 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 22:50:59,606 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 22:50:59,606 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 22:50:59,606 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 22:50:59,607 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:50:59" (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 [2020-08-18 22:50:59,664 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 22:50:59,665 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 22:50:59,665 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-18 22:50:59,665 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 22:50:59,665 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 22:50:59,665 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-18 22:50:59,665 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 22:50:59,666 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 22:50:59,666 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 22:50:59,832 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 22:50:59,832 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-18 22:50:59,835 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 10:50:59 BoogieIcfgContainer [2020-08-18 22:50:59,836 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 22:50:59,837 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 22:50:59,837 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 22:50:59,840 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 22:50:59,840 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 10:50:59" (1/3) ... [2020-08-18 22:50:59,841 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1917ff4e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 10:50:59, skipping insertion in model container [2020-08-18 22:50:59,842 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:50:59" (2/3) ... [2020-08-18 22:50:59,842 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1917ff4e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 10:50:59, skipping insertion in model container [2020-08-18 22:50:59,842 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 10:50:59" (3/3) ... [2020-08-18 22:50:59,844 INFO L109 eAbstractionObserver]: Analyzing ICFG simple_4-2.c [2020-08-18 22:50:59,854 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 22:50:59,861 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 22:50:59,876 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 22:50:59,900 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 22:50:59,900 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 22:50:59,900 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 22:50:59,900 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 22:50:59,900 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 22:50:59,901 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 22:50:59,901 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 22:50:59,901 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 22:50:59,916 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2020-08-18 22:50:59,921 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-18 22:50:59,921 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:59,922 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:59,922 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:59,927 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:59,928 INFO L82 PathProgramCache]: Analyzing trace with hash 1846144830, now seen corresponding path program 1 times [2020-08-18 22:50:59,934 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:59,935 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [675596781] [2020-08-18 22:50:59,935 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:00,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:00,129 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:00,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:00,137 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:00,138 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [675596781] [2020-08-18 22:51:00,140 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 22:51:00,140 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-18 22:51:00,141 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [437040731] [2020-08-18 22:51:00,153 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-18 22:51:00,153 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:00,183 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-18 22:51:00,185 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 22:51:00,193 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 3 states. [2020-08-18 22:51:00,282 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:00,283 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-08-18 22:51:00,284 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-18 22:51:00,292 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-08-18 22:51:00,292 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:00,303 INFO L225 Difference]: With dead ends: 29 [2020-08-18 22:51:00,303 INFO L226 Difference]: Without dead ends: 12 [2020-08-18 22:51:00,308 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 22:51:00,322 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-08-18 22:51:00,337 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-08-18 22:51:00,338 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-08-18 22:51:00,339 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2020-08-18 22:51:00,341 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2020-08-18 22:51:00,341 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:00,341 INFO L479 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2020-08-18 22:51:00,341 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-18 22:51:00,342 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2020-08-18 22:51:00,342 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-08-18 22:51:00,343 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:00,343 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:00,343 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 22:51:00,344 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:00,344 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:00,344 INFO L82 PathProgramCache]: Analyzing trace with hash 1432376145, now seen corresponding path program 1 times [2020-08-18 22:51:00,345 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:00,345 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [237026661] [2020-08-18 22:51:00,345 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:00,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:00,427 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:00,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:00,432 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:00,433 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [237026661] [2020-08-18 22:51:00,433 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:00,433 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-08-18 22:51:00,434 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [970523192] [2020-08-18 22:51:00,436 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 22:51:00,436 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:00,437 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 22:51:00,437 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-18 22:51:00,437 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 4 states. [2020-08-18 22:51:00,465 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:00,465 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2020-08-18 22:51:00,466 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 22:51:00,466 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 11 [2020-08-18 22:51:00,466 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:00,467 INFO L225 Difference]: With dead ends: 18 [2020-08-18 22:51:00,467 INFO L226 Difference]: Without dead ends: 13 [2020-08-18 22:51:00,468 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 [2020-08-18 22:51:00,469 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-08-18 22:51:00,474 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-08-18 22:51:00,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-08-18 22:51:00,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2020-08-18 22:51:00,475 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2020-08-18 22:51:00,475 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:00,476 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2020-08-18 22:51:00,476 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 22:51:00,476 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2020-08-18 22:51:00,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-18 22:51:00,477 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:00,477 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:00,477 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 22:51:00,477 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:00,478 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:00,478 INFO L82 PathProgramCache]: Analyzing trace with hash 1490448798, now seen corresponding path program 2 times [2020-08-18 22:51:00,478 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:00,478 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [489633554] [2020-08-18 22:51:00,478 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:00,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:00,570 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:00,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:00,574 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:00,574 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [489633554] [2020-08-18 22:51:00,575 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:00,575 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-18 22:51:00,575 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1557999956] [2020-08-18 22:51:00,576 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 22:51:00,576 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:00,576 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 22:51:00,577 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-18 22:51:00,577 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 5 states. [2020-08-18 22:51:00,597 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:00,598 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2020-08-18 22:51:00,598 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 22:51:00,598 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2020-08-18 22:51:00,599 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:00,599 INFO L225 Difference]: With dead ends: 19 [2020-08-18 22:51:00,599 INFO L226 Difference]: Without dead ends: 14 [2020-08-18 22:51:00,600 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 [2020-08-18 22:51:00,601 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-08-18 22:51:00,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-08-18 22:51:00,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-08-18 22:51:00,605 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-08-18 22:51:00,605 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-08-18 22:51:00,606 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:00,606 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-08-18 22:51:00,606 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 22:51:00,606 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-08-18 22:51:00,607 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-18 22:51:00,607 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:00,607 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:00,607 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 22:51:00,607 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:00,608 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:00,608 INFO L82 PathProgramCache]: Analyzing trace with hash -1004266255, now seen corresponding path program 3 times [2020-08-18 22:51:00,608 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:00,609 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1147409706] [2020-08-18 22:51:00,609 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:00,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:00,717 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:00,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:00,720 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:00,721 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1147409706] [2020-08-18 22:51:00,721 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:00,721 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-18 22:51:00,722 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2027537842] [2020-08-18 22:51:00,722 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 22:51:00,722 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:00,722 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 22:51:00,723 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-18 22:51:00,723 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 6 states. [2020-08-18 22:51:00,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:00,748 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2020-08-18 22:51:00,748 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 22:51:00,748 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 13 [2020-08-18 22:51:00,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:00,749 INFO L225 Difference]: With dead ends: 20 [2020-08-18 22:51:00,749 INFO L226 Difference]: Without dead ends: 15 [2020-08-18 22:51:00,750 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 [2020-08-18 22:51:00,750 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-18 22:51:00,753 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-18 22:51:00,754 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-18 22:51:00,754 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-08-18 22:51:00,754 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2020-08-18 22:51:00,756 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:00,756 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-08-18 22:51:00,756 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 22:51:00,756 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-08-18 22:51:00,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-18 22:51:00,757 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:00,757 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:00,757 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 22:51:00,758 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:00,758 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:00,758 INFO L82 PathProgramCache]: Analyzing trace with hash -1031021570, now seen corresponding path program 4 times [2020-08-18 22:51:00,758 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:00,759 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1276797203] [2020-08-18 22:51:00,759 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:00,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:00,884 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:00,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:00,888 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:00,889 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1276797203] [2020-08-18 22:51:00,889 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:00,890 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 22:51:00,890 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [144117479] [2020-08-18 22:51:00,890 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 22:51:00,891 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:00,891 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 22:51:00,891 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-18 22:51:00,892 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 7 states. [2020-08-18 22:51:00,929 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:00,930 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2020-08-18 22:51:00,930 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 22:51:00,931 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 14 [2020-08-18 22:51:00,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:00,932 INFO L225 Difference]: With dead ends: 21 [2020-08-18 22:51:00,932 INFO L226 Difference]: Without dead ends: 16 [2020-08-18 22:51:00,933 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 [2020-08-18 22:51:00,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-18 22:51:00,937 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-18 22:51:00,938 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-18 22:51:00,939 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2020-08-18 22:51:00,939 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2020-08-18 22:51:00,939 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:00,939 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2020-08-18 22:51:00,940 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 22:51:00,940 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2020-08-18 22:51:00,940 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-18 22:51:00,941 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:00,941 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:00,941 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 22:51:00,941 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:00,942 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:00,942 INFO L82 PathProgramCache]: Analyzing trace with hash -1860436335, now seen corresponding path program 5 times [2020-08-18 22:51:00,942 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:00,943 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [229413516] [2020-08-18 22:51:00,943 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:00,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:01,091 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:01,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:01,094 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:01,095 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [229413516] [2020-08-18 22:51:01,095 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:01,095 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-18 22:51:01,095 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [511213605] [2020-08-18 22:51:01,096 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-18 22:51:01,096 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:01,096 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-18 22:51:01,097 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-08-18 22:51:01,097 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 8 states. [2020-08-18 22:51:01,139 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:01,139 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2020-08-18 22:51:01,140 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-18 22:51:01,140 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 15 [2020-08-18 22:51:01,140 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:01,141 INFO L225 Difference]: With dead ends: 22 [2020-08-18 22:51:01,141 INFO L226 Difference]: Without dead ends: 17 [2020-08-18 22:51:01,142 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-08-18 22:51:01,142 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-18 22:51:01,146 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-18 22:51:01,146 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-18 22:51:01,147 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-18 22:51:01,147 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2020-08-18 22:51:01,147 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:01,147 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-18 22:51:01,148 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-18 22:51:01,148 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-18 22:51:01,148 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-18 22:51:01,148 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:01,149 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:01,149 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 22:51:01,149 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:01,149 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:01,149 INFO L82 PathProgramCache]: Analyzing trace with hash -1802490274, now seen corresponding path program 6 times [2020-08-18 22:51:01,150 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:01,150 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [187706670] [2020-08-18 22:51:01,150 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:01,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:01,326 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:01,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:01,329 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:01,329 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [187706670] [2020-08-18 22:51:01,330 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:01,332 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 22:51:01,332 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1165455041] [2020-08-18 22:51:01,333 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 22:51:01,333 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:01,333 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 22:51:01,334 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-18 22:51:01,334 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 9 states. [2020-08-18 22:51:01,400 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:01,401 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2020-08-18 22:51:01,402 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-18 22:51:01,402 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 16 [2020-08-18 22:51:01,402 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:01,403 INFO L225 Difference]: With dead ends: 23 [2020-08-18 22:51:01,403 INFO L226 Difference]: Without dead ends: 18 [2020-08-18 22:51:01,404 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 [2020-08-18 22:51:01,404 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-18 22:51:01,410 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-08-18 22:51:01,411 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-18 22:51:01,414 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2020-08-18 22:51:01,414 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 16 [2020-08-18 22:51:01,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:01,414 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2020-08-18 22:51:01,414 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 22:51:01,415 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2020-08-18 22:51:01,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-18 22:51:01,415 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:01,415 INFO L422 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:01,420 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 22:51:01,421 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:01,421 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:01,421 INFO L82 PathProgramCache]: Analyzing trace with hash -6162383, now seen corresponding path program 7 times [2020-08-18 22:51:01,421 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:01,422 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1522956947] [2020-08-18 22:51:01,422 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:01,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:01,567 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:01,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:01,570 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:01,570 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1522956947] [2020-08-18 22:51:01,571 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:01,571 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-18 22:51:01,571 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1457670578] [2020-08-18 22:51:01,572 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-18 22:51:01,572 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:01,572 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-18 22:51:01,572 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-08-18 22:51:01,573 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 10 states. [2020-08-18 22:51:01,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:01,634 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2020-08-18 22:51:01,635 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-18 22:51:01,635 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 17 [2020-08-18 22:51:01,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:01,636 INFO L225 Difference]: With dead ends: 24 [2020-08-18 22:51:01,636 INFO L226 Difference]: Without dead ends: 19 [2020-08-18 22:51:01,636 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 [2020-08-18 22:51:01,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-08-18 22:51:01,641 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-08-18 22:51:01,641 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-18 22:51:01,642 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2020-08-18 22:51:01,642 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 17 [2020-08-18 22:51:01,642 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:01,643 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2020-08-18 22:51:01,643 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-18 22:51:01,643 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2020-08-18 22:51:01,643 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-18 22:51:01,643 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:01,644 INFO L422 BasicCegarLoop]: trace histogram [8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:01,644 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-18 22:51:01,644 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:01,644 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:01,645 INFO L82 PathProgramCache]: Analyzing trace with hash -154572610, now seen corresponding path program 8 times [2020-08-18 22:51:01,645 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:01,645 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1468769411] [2020-08-18 22:51:01,645 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:01,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:01,852 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:01,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:01,857 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:01,858 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1468769411] [2020-08-18 22:51:01,858 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:01,858 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-18 22:51:01,859 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [693052291] [2020-08-18 22:51:01,860 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-18 22:51:01,860 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:01,860 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-18 22:51:01,861 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-08-18 22:51:01,862 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 11 states. [2020-08-18 22:51:01,950 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:01,950 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2020-08-18 22:51:01,952 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-18 22:51:01,952 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 18 [2020-08-18 22:51:01,953 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:01,953 INFO L225 Difference]: With dead ends: 25 [2020-08-18 22:51:01,953 INFO L226 Difference]: Without dead ends: 20 [2020-08-18 22:51:01,955 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 [2020-08-18 22:51:01,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-18 22:51:01,963 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-18 22:51:01,964 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-18 22:51:01,964 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2020-08-18 22:51:01,965 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 18 [2020-08-18 22:51:01,969 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:01,970 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2020-08-18 22:51:01,970 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-18 22:51:01,970 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2020-08-18 22:51:01,970 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-18 22:51:01,971 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:01,971 INFO L422 BasicCegarLoop]: trace histogram [9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:01,971 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-18 22:51:01,971 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:01,972 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:01,974 INFO L82 PathProgramCache]: Analyzing trace with hash -460322351, now seen corresponding path program 9 times [2020-08-18 22:51:01,974 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:01,974 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2091874954] [2020-08-18 22:51:01,976 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:01,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:02,216 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:02,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:02,221 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:02,222 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2091874954] [2020-08-18 22:51:02,222 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:02,222 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-18 22:51:02,223 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [84812448] [2020-08-18 22:51:02,223 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-18 22:51:02,223 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:02,223 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-18 22:51:02,224 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-08-18 22:51:02,225 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 12 states. [2020-08-18 22:51:02,317 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:02,317 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-08-18 22:51:02,318 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-18 22:51:02,318 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 19 [2020-08-18 22:51:02,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:02,319 INFO L225 Difference]: With dead ends: 26 [2020-08-18 22:51:02,319 INFO L226 Difference]: Without dead ends: 21 [2020-08-18 22:51:02,319 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 [2020-08-18 22:51:02,320 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-18 22:51:02,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-18 22:51:02,329 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-18 22:51:02,329 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2020-08-18 22:51:02,329 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 19 [2020-08-18 22:51:02,330 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:02,330 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2020-08-18 22:51:02,330 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-18 22:51:02,330 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2020-08-18 22:51:02,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-18 22:51:02,331 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:02,331 INFO L422 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:02,331 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-18 22:51:02,331 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:02,331 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:02,332 INFO L82 PathProgramCache]: Analyzing trace with hash -1348629730, now seen corresponding path program 10 times [2020-08-18 22:51:02,332 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:02,333 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [452771679] [2020-08-18 22:51:02,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:02,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:02,557 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:02,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:02,561 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:02,561 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [452771679] [2020-08-18 22:51:02,562 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:02,562 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 22:51:02,562 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1220130517] [2020-08-18 22:51:02,563 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 22:51:02,564 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:02,564 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 22:51:02,564 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-08-18 22:51:02,564 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 13 states. [2020-08-18 22:51:02,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:02,680 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2020-08-18 22:51:02,681 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-18 22:51:02,682 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 20 [2020-08-18 22:51:02,682 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:02,683 INFO L225 Difference]: With dead ends: 27 [2020-08-18 22:51:02,683 INFO L226 Difference]: Without dead ends: 22 [2020-08-18 22:51:02,684 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 [2020-08-18 22:51:02,684 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-18 22:51:02,691 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-08-18 22:51:02,692 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-18 22:51:02,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2020-08-18 22:51:02,692 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 20 [2020-08-18 22:51:02,693 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:02,693 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2020-08-18 22:51:02,693 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 22:51:02,693 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2020-08-18 22:51:02,694 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-18 22:51:02,694 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:02,694 INFO L422 BasicCegarLoop]: trace histogram [11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:02,694 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-18 22:51:02,695 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:02,695 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:02,695 INFO L82 PathProgramCache]: Analyzing trace with hash 1178612593, now seen corresponding path program 11 times [2020-08-18 22:51:02,695 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:02,696 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1842247472] [2020-08-18 22:51:02,696 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:02,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:02,950 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:02,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:02,956 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:02,957 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1842247472] [2020-08-18 22:51:02,957 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:02,958 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-18 22:51:02,958 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1959069253] [2020-08-18 22:51:02,958 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-18 22:51:02,960 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:02,960 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-18 22:51:02,960 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-08-18 22:51:02,960 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 14 states. [2020-08-18 22:51:03,076 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:03,077 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2020-08-18 22:51:03,077 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-18 22:51:03,077 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 21 [2020-08-18 22:51:03,078 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:03,078 INFO L225 Difference]: With dead ends: 28 [2020-08-18 22:51:03,078 INFO L226 Difference]: Without dead ends: 23 [2020-08-18 22:51:03,079 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 [2020-08-18 22:51:03,079 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-18 22:51:03,083 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-08-18 22:51:03,083 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-18 22:51:03,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-08-18 22:51:03,084 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 21 [2020-08-18 22:51:03,084 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:03,084 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-08-18 22:51:03,084 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-18 22:51:03,084 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-08-18 22:51:03,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-18 22:51:03,085 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:03,085 INFO L422 BasicCegarLoop]: trace histogram [12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:03,086 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-18 22:51:03,086 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:03,086 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:03,086 INFO L82 PathProgramCache]: Analyzing trace with hash -2081254018, now seen corresponding path program 12 times [2020-08-18 22:51:03,086 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:03,087 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [534370008] [2020-08-18 22:51:03,087 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:03,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:03,295 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:03,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:03,298 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:03,299 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [534370008] [2020-08-18 22:51:03,299 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:03,299 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-18 22:51:03,300 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1018368152] [2020-08-18 22:51:03,300 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-18 22:51:03,300 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:03,300 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-18 22:51:03,301 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-08-18 22:51:03,302 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 15 states. [2020-08-18 22:51:03,411 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:03,412 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2020-08-18 22:51:03,413 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-18 22:51:03,413 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 22 [2020-08-18 22:51:03,413 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:03,414 INFO L225 Difference]: With dead ends: 29 [2020-08-18 22:51:03,414 INFO L226 Difference]: Without dead ends: 24 [2020-08-18 22:51:03,414 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 [2020-08-18 22:51:03,415 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-18 22:51:03,421 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-08-18 22:51:03,421 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-18 22:51:03,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2020-08-18 22:51:03,423 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 22 [2020-08-18 22:51:03,423 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:03,423 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2020-08-18 22:51:03,423 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-18 22:51:03,424 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2020-08-18 22:51:03,424 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-08-18 22:51:03,424 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:03,425 INFO L422 BasicCegarLoop]: trace histogram [13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:03,425 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-18 22:51:03,425 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:03,425 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:03,425 INFO L82 PathProgramCache]: Analyzing trace with hash -57903855, now seen corresponding path program 13 times [2020-08-18 22:51:03,426 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:03,426 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1656958808] [2020-08-18 22:51:03,426 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:03,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:03,664 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:03,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:03,668 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:03,668 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1656958808] [2020-08-18 22:51:03,668 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:03,670 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-18 22:51:03,670 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2100359070] [2020-08-18 22:51:03,670 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-18 22:51:03,671 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:03,671 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-18 22:51:03,671 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2020-08-18 22:51:03,671 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 16 states. [2020-08-18 22:51:03,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:03,813 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2020-08-18 22:51:03,814 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-18 22:51:03,815 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 23 [2020-08-18 22:51:03,815 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:03,815 INFO L225 Difference]: With dead ends: 30 [2020-08-18 22:51:03,815 INFO L226 Difference]: Without dead ends: 25 [2020-08-18 22:51:03,816 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2020-08-18 22:51:03,816 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-18 22:51:03,820 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-08-18 22:51:03,820 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-18 22:51:03,820 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2020-08-18 22:51:03,820 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 23 [2020-08-18 22:51:03,821 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:03,821 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2020-08-18 22:51:03,821 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-18 22:51:03,821 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2020-08-18 22:51:03,822 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-18 22:51:03,822 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:03,822 INFO L422 BasicCegarLoop]: trace histogram [14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:03,822 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-18 22:51:03,822 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:03,822 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:03,823 INFO L82 PathProgramCache]: Analyzing trace with hash -1758558242, now seen corresponding path program 14 times [2020-08-18 22:51:03,823 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:03,823 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [146681843] [2020-08-18 22:51:03,823 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:03,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:04,071 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:04,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:04,074 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:04,074 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [146681843] [2020-08-18 22:51:04,074 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:04,074 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-18 22:51:04,075 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1532750676] [2020-08-18 22:51:04,075 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-18 22:51:04,075 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:04,075 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-18 22:51:04,078 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-08-18 22:51:04,078 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 17 states. [2020-08-18 22:51:04,227 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:04,228 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2020-08-18 22:51:04,228 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-18 22:51:04,228 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 24 [2020-08-18 22:51:04,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:04,229 INFO L225 Difference]: With dead ends: 31 [2020-08-18 22:51:04,229 INFO L226 Difference]: Without dead ends: 26 [2020-08-18 22:51:04,230 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 [2020-08-18 22:51:04,230 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-18 22:51:04,234 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-08-18 22:51:04,235 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-18 22:51:04,236 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2020-08-18 22:51:04,236 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 24 [2020-08-18 22:51:04,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:04,238 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2020-08-18 22:51:04,238 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-18 22:51:04,238 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2020-08-18 22:51:04,240 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-18 22:51:04,240 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:04,241 INFO L422 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:04,241 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-18 22:51:04,241 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:04,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:04,242 INFO L82 PathProgramCache]: Analyzing trace with hash 1355730609, now seen corresponding path program 15 times [2020-08-18 22:51:04,242 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:04,242 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [163716972] [2020-08-18 22:51:04,243 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:04,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:04,548 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:04,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:04,552 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:04,552 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [163716972] [2020-08-18 22:51:04,552 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:04,552 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-18 22:51:04,553 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [756729815] [2020-08-18 22:51:04,553 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-18 22:51:04,553 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:04,554 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-18 22:51:04,554 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2020-08-18 22:51:04,554 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 18 states. [2020-08-18 22:51:04,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:04,747 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-08-18 22:51:04,747 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-18 22:51:04,748 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 25 [2020-08-18 22:51:04,748 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:04,748 INFO L225 Difference]: With dead ends: 32 [2020-08-18 22:51:04,748 INFO L226 Difference]: Without dead ends: 27 [2020-08-18 22:51:04,749 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 [2020-08-18 22:51:04,749 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-08-18 22:51:04,753 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-08-18 22:51:04,753 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-18 22:51:04,753 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2020-08-18 22:51:04,754 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 25 [2020-08-18 22:51:04,754 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:04,754 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2020-08-18 22:51:04,754 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-18 22:51:04,754 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2020-08-18 22:51:04,755 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-18 22:51:04,755 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:04,755 INFO L422 BasicCegarLoop]: trace histogram [16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:04,755 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-18 22:51:04,755 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:04,756 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:04,756 INFO L82 PathProgramCache]: Analyzing trace with hash -885562818, now seen corresponding path program 16 times [2020-08-18 22:51:04,756 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:04,756 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [668648369] [2020-08-18 22:51:04,756 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:04,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:05,082 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:05,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:05,085 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:05,086 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [668648369] [2020-08-18 22:51:05,086 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:05,086 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-18 22:51:05,086 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1697909936] [2020-08-18 22:51:05,087 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-18 22:51:05,087 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:05,087 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-18 22:51:05,088 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-08-18 22:51:05,088 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 19 states. [2020-08-18 22:51:05,300 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:05,301 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2020-08-18 22:51:05,302 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-18 22:51:05,302 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 26 [2020-08-18 22:51:05,303 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:05,303 INFO L225 Difference]: With dead ends: 33 [2020-08-18 22:51:05,303 INFO L226 Difference]: Without dead ends: 28 [2020-08-18 22:51:05,304 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 [2020-08-18 22:51:05,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-18 22:51:05,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-08-18 22:51:05,308 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-18 22:51:05,308 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2020-08-18 22:51:05,309 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 26 [2020-08-18 22:51:05,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:05,309 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2020-08-18 22:51:05,309 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-18 22:51:05,309 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2020-08-18 22:51:05,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-18 22:51:05,310 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:05,310 INFO L422 BasicCegarLoop]: trace histogram [17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:05,310 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-18 22:51:05,311 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:05,311 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:05,311 INFO L82 PathProgramCache]: Analyzing trace with hash -1646182319, now seen corresponding path program 17 times [2020-08-18 22:51:05,311 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:05,312 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [898071791] [2020-08-18 22:51:05,312 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:05,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:05,665 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:05,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:05,669 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:05,670 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [898071791] [2020-08-18 22:51:05,670 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:05,670 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-18 22:51:05,671 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [840611259] [2020-08-18 22:51:05,671 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-18 22:51:05,671 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:05,671 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-18 22:51:05,672 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2020-08-18 22:51:05,672 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 20 states. [2020-08-18 22:51:05,902 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:05,902 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2020-08-18 22:51:05,903 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-18 22:51:05,903 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 27 [2020-08-18 22:51:05,903 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:05,904 INFO L225 Difference]: With dead ends: 34 [2020-08-18 22:51:05,904 INFO L226 Difference]: Without dead ends: 29 [2020-08-18 22:51:05,905 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2020-08-18 22:51:05,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-18 22:51:05,909 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-08-18 22:51:05,910 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-18 22:51:05,910 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-08-18 22:51:05,910 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 27 [2020-08-18 22:51:05,911 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:05,911 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-08-18 22:51:05,911 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-18 22:51:05,911 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-08-18 22:51:05,911 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-18 22:51:05,912 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:05,912 INFO L422 BasicCegarLoop]: trace histogram [18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:05,912 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-18 22:51:05,912 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:05,912 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:05,912 INFO L82 PathProgramCache]: Analyzing trace with hash 544416926, now seen corresponding path program 18 times [2020-08-18 22:51:05,913 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:05,913 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [156869644] [2020-08-18 22:51:05,913 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:05,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:06,268 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:06,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:06,271 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:06,271 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [156869644] [2020-08-18 22:51:06,272 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:06,272 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-18 22:51:06,272 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1010021272] [2020-08-18 22:51:06,272 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-18 22:51:06,272 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:06,273 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-18 22:51:06,273 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2020-08-18 22:51:06,273 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 21 states. [2020-08-18 22:51:06,519 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:06,519 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2020-08-18 22:51:06,520 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-18 22:51:06,520 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 28 [2020-08-18 22:51:06,520 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:06,521 INFO L225 Difference]: With dead ends: 35 [2020-08-18 22:51:06,521 INFO L226 Difference]: Without dead ends: 30 [2020-08-18 22:51:06,521 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 [2020-08-18 22:51:06,523 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-18 22:51:06,529 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-08-18 22:51:06,529 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-18 22:51:06,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2020-08-18 22:51:06,534 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 28 [2020-08-18 22:51:06,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:06,534 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2020-08-18 22:51:06,534 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-18 22:51:06,534 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2020-08-18 22:51:06,537 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-18 22:51:06,537 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:06,538 INFO L422 BasicCegarLoop]: trace histogram [19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:06,538 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-18 22:51:06,538 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:06,538 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:06,538 INFO L82 PathProgramCache]: Analyzing trace with hash -266483215, now seen corresponding path program 19 times [2020-08-18 22:51:06,539 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:06,539 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1867815106] [2020-08-18 22:51:06,539 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:06,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:06,922 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:06,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:06,926 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:06,926 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1867815106] [2020-08-18 22:51:06,926 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:06,927 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-18 22:51:06,927 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [762607663] [2020-08-18 22:51:06,927 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-18 22:51:06,927 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:06,927 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-18 22:51:06,928 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2020-08-18 22:51:06,928 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 22 states. [2020-08-18 22:51:07,214 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:07,215 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2020-08-18 22:51:07,215 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-18 22:51:07,215 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 29 [2020-08-18 22:51:07,216 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:07,216 INFO L225 Difference]: With dead ends: 36 [2020-08-18 22:51:07,216 INFO L226 Difference]: Without dead ends: 31 [2020-08-18 22:51:07,217 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 [2020-08-18 22:51:07,217 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-18 22:51:07,222 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-08-18 22:51:07,223 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-18 22:51:07,223 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2020-08-18 22:51:07,224 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 29 [2020-08-18 22:51:07,224 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:07,224 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2020-08-18 22:51:07,224 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-18 22:51:07,224 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2020-08-18 22:51:07,225 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-18 22:51:07,225 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:07,225 INFO L422 BasicCegarLoop]: trace histogram [20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:07,226 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-18 22:51:07,226 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:07,226 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:07,226 INFO L82 PathProgramCache]: Analyzing trace with hash 365416190, now seen corresponding path program 20 times [2020-08-18 22:51:07,226 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:07,227 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [717572158] [2020-08-18 22:51:07,227 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:07,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:07,630 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:07,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:07,634 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:07,634 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [717572158] [2020-08-18 22:51:07,635 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:07,635 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-18 22:51:07,635 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1709239356] [2020-08-18 22:51:07,637 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-18 22:51:07,637 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:07,638 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-18 22:51:07,638 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2020-08-18 22:51:07,638 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 23 states. [2020-08-18 22:51:07,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:07,929 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2020-08-18 22:51:07,929 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-18 22:51:07,929 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 30 [2020-08-18 22:51:07,930 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:07,930 INFO L225 Difference]: With dead ends: 37 [2020-08-18 22:51:07,930 INFO L226 Difference]: Without dead ends: 32 [2020-08-18 22:51:07,931 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 [2020-08-18 22:51:07,931 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-18 22:51:07,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-08-18 22:51:07,939 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-18 22:51:07,940 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2020-08-18 22:51:07,940 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 30 [2020-08-18 22:51:07,940 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:07,940 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2020-08-18 22:51:07,940 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-18 22:51:07,940 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2020-08-18 22:51:07,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-18 22:51:07,941 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:07,941 INFO L422 BasicCegarLoop]: trace histogram [21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:07,941 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-18 22:51:07,942 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:07,945 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:07,945 INFO L82 PathProgramCache]: Analyzing trace with hash -1520538735, now seen corresponding path program 21 times [2020-08-18 22:51:07,945 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:07,945 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1298202900] [2020-08-18 22:51:07,945 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:07,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:08,425 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:08,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:08,429 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:08,429 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1298202900] [2020-08-18 22:51:08,429 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:08,430 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-18 22:51:08,430 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1511840350] [2020-08-18 22:51:08,430 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-18 22:51:08,430 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:08,430 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-18 22:51:08,431 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2020-08-18 22:51:08,431 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 24 states. [2020-08-18 22:51:08,732 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:08,732 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-08-18 22:51:08,735 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-18 22:51:08,735 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 31 [2020-08-18 22:51:08,735 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:08,736 INFO L225 Difference]: With dead ends: 38 [2020-08-18 22:51:08,736 INFO L226 Difference]: Without dead ends: 33 [2020-08-18 22:51:08,737 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 [2020-08-18 22:51:08,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-18 22:51:08,741 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-08-18 22:51:08,741 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-18 22:51:08,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2020-08-18 22:51:08,742 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 31 [2020-08-18 22:51:08,742 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:08,742 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2020-08-18 22:51:08,743 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-18 22:51:08,743 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2020-08-18 22:51:08,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-18 22:51:08,743 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:08,743 INFO L422 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:08,744 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-18 22:51:08,744 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:08,744 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:08,744 INFO L82 PathProgramCache]: Analyzing trace with hash 144400734, now seen corresponding path program 22 times [2020-08-18 22:51:08,744 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:08,745 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [806315027] [2020-08-18 22:51:08,745 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:08,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:09,245 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:09,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:09,252 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:09,253 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [806315027] [2020-08-18 22:51:09,253 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:09,253 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-18 22:51:09,253 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1126124780] [2020-08-18 22:51:09,254 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-18 22:51:09,254 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:09,254 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-18 22:51:09,255 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2020-08-18 22:51:09,255 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 25 states. [2020-08-18 22:51:09,629 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:09,629 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2020-08-18 22:51:09,636 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-18 22:51:09,636 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 32 [2020-08-18 22:51:09,637 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:09,637 INFO L225 Difference]: With dead ends: 39 [2020-08-18 22:51:09,637 INFO L226 Difference]: Without dead ends: 34 [2020-08-18 22:51:09,638 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 [2020-08-18 22:51:09,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-18 22:51:09,642 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-08-18 22:51:09,642 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-18 22:51:09,643 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2020-08-18 22:51:09,643 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 32 [2020-08-18 22:51:09,643 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:09,643 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2020-08-18 22:51:09,643 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-18 22:51:09,643 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2020-08-18 22:51:09,644 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-18 22:51:09,644 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:09,644 INFO L422 BasicCegarLoop]: trace histogram [23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:09,644 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-18 22:51:09,645 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:09,645 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:09,645 INFO L82 PathProgramCache]: Analyzing trace with hash 217916721, now seen corresponding path program 23 times [2020-08-18 22:51:09,645 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:09,645 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [199082843] [2020-08-18 22:51:09,645 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:09,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:10,123 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:10,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:10,127 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:10,127 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [199082843] [2020-08-18 22:51:10,127 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:10,127 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-18 22:51:10,128 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2009457838] [2020-08-18 22:51:10,128 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-18 22:51:10,128 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:10,128 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-18 22:51:10,129 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2020-08-18 22:51:10,129 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 26 states. [2020-08-18 22:51:10,483 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:10,483 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2020-08-18 22:51:10,484 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-18 22:51:10,484 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 33 [2020-08-18 22:51:10,484 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:10,485 INFO L225 Difference]: With dead ends: 40 [2020-08-18 22:51:10,485 INFO L226 Difference]: Without dead ends: 35 [2020-08-18 22:51:10,486 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2020-08-18 22:51:10,486 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-18 22:51:10,490 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-08-18 22:51:10,491 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-18 22:51:10,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-08-18 22:51:10,493 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 33 [2020-08-18 22:51:10,493 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:10,493 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-08-18 22:51:10,494 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-18 22:51:10,494 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-08-18 22:51:10,494 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-18 22:51:10,494 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:10,494 INFO L422 BasicCegarLoop]: trace histogram [24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:10,496 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-18 22:51:10,498 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:10,498 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:10,498 INFO L82 PathProgramCache]: Analyzing trace with hash -1798054978, now seen corresponding path program 24 times [2020-08-18 22:51:10,498 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:10,499 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [932145489] [2020-08-18 22:51:10,499 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:10,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:11,034 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:11,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:11,039 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:11,039 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [932145489] [2020-08-18 22:51:11,040 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:11,040 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-18 22:51:11,040 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2108965783] [2020-08-18 22:51:11,040 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-18 22:51:11,041 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:11,041 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-18 22:51:11,041 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2020-08-18 22:51:11,042 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 27 states. [2020-08-18 22:51:11,414 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:11,415 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2020-08-18 22:51:11,415 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-18 22:51:11,415 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 34 [2020-08-18 22:51:11,415 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:11,416 INFO L225 Difference]: With dead ends: 41 [2020-08-18 22:51:11,416 INFO L226 Difference]: Without dead ends: 36 [2020-08-18 22:51:11,417 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 [2020-08-18 22:51:11,417 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-18 22:51:11,420 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-08-18 22:51:11,420 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-18 22:51:11,421 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2020-08-18 22:51:11,421 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 34 [2020-08-18 22:51:11,421 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:11,421 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2020-08-18 22:51:11,421 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-18 22:51:11,422 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2020-08-18 22:51:11,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-18 22:51:11,422 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:11,422 INFO L422 BasicCegarLoop]: trace histogram [25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:11,422 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-18 22:51:11,423 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:11,423 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:11,423 INFO L82 PathProgramCache]: Analyzing trace with hash 131331793, now seen corresponding path program 25 times [2020-08-18 22:51:11,423 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:11,423 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [66549018] [2020-08-18 22:51:11,423 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:11,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:12,015 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:12,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:12,020 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:12,020 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [66549018] [2020-08-18 22:51:12,020 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:12,021 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-18 22:51:12,021 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [387252310] [2020-08-18 22:51:12,021 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-18 22:51:12,021 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:12,022 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-18 22:51:12,022 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2020-08-18 22:51:12,022 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 28 states. [2020-08-18 22:51:12,471 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:12,471 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2020-08-18 22:51:12,472 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-18 22:51:12,472 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 35 [2020-08-18 22:51:12,473 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:12,473 INFO L225 Difference]: With dead ends: 42 [2020-08-18 22:51:12,473 INFO L226 Difference]: Without dead ends: 37 [2020-08-18 22:51:12,474 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 [2020-08-18 22:51:12,474 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-18 22:51:12,478 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-08-18 22:51:12,478 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-18 22:51:12,478 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2020-08-18 22:51:12,479 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 35 [2020-08-18 22:51:12,479 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:12,479 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2020-08-18 22:51:12,479 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-18 22:51:12,479 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2020-08-18 22:51:12,480 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-18 22:51:12,480 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:12,480 INFO L422 BasicCegarLoop]: trace histogram [26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:12,480 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-18 22:51:12,480 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:12,480 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:12,480 INFO L82 PathProgramCache]: Analyzing trace with hash -187220450, now seen corresponding path program 26 times [2020-08-18 22:51:12,481 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:12,481 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [20741813] [2020-08-18 22:51:12,481 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:12,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:13,137 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:13,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:13,141 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:13,142 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [20741813] [2020-08-18 22:51:13,142 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:13,142 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-18 22:51:13,142 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [684945605] [2020-08-18 22:51:13,142 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-18 22:51:13,143 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:13,143 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-18 22:51:13,143 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=731, Unknown=0, NotChecked=0, Total=812 [2020-08-18 22:51:13,151 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 29 states. [2020-08-18 22:51:13,620 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:13,620 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2020-08-18 22:51:13,621 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-18 22:51:13,621 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 36 [2020-08-18 22:51:13,621 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:13,622 INFO L225 Difference]: With dead ends: 43 [2020-08-18 22:51:13,622 INFO L226 Difference]: Without dead ends: 38 [2020-08-18 22:51:13,623 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=81, Invalid=731, Unknown=0, NotChecked=0, Total=812 [2020-08-18 22:51:13,623 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-18 22:51:13,632 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-08-18 22:51:13,632 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-18 22:51:13,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2020-08-18 22:51:13,633 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 36 [2020-08-18 22:51:13,633 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:13,633 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2020-08-18 22:51:13,633 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-18 22:51:13,633 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2020-08-18 22:51:13,634 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-18 22:51:13,634 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:13,634 INFO L422 BasicCegarLoop]: trace histogram [27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:13,634 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-18 22:51:13,634 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:13,634 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:13,635 INFO L82 PathProgramCache]: Analyzing trace with hash -1472405391, now seen corresponding path program 27 times [2020-08-18 22:51:13,635 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:13,635 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1786492759] [2020-08-18 22:51:13,635 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:13,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:14,304 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:14,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:14,309 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:14,309 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1786492759] [2020-08-18 22:51:14,309 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:14,309 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-18 22:51:14,310 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1392754316] [2020-08-18 22:51:14,310 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-18 22:51:14,310 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:14,310 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-18 22:51:14,311 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2020-08-18 22:51:14,311 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 30 states. [2020-08-18 22:51:14,816 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:14,816 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-08-18 22:51:14,816 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-18 22:51:14,816 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 37 [2020-08-18 22:51:14,817 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:14,817 INFO L225 Difference]: With dead ends: 44 [2020-08-18 22:51:14,817 INFO L226 Difference]: Without dead ends: 39 [2020-08-18 22:51:14,818 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 [2020-08-18 22:51:14,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-18 22:51:14,821 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-18 22:51:14,821 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-18 22:51:14,821 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2020-08-18 22:51:14,822 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 37 [2020-08-18 22:51:14,822 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:14,822 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2020-08-18 22:51:14,822 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-18 22:51:14,822 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2020-08-18 22:51:14,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-18 22:51:14,823 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:14,823 INFO L422 BasicCegarLoop]: trace histogram [28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:14,823 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-18 22:51:14,823 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:14,823 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:14,824 INFO L82 PathProgramCache]: Analyzing trace with hash 1636534398, now seen corresponding path program 28 times [2020-08-18 22:51:14,824 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:14,824 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1006743423] [2020-08-18 22:51:14,824 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:14,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:15,527 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:15,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:15,531 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:15,531 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1006743423] [2020-08-18 22:51:15,532 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:15,532 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-18 22:51:15,532 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1258665548] [2020-08-18 22:51:15,532 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-18 22:51:15,532 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:15,533 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-18 22:51:15,533 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2020-08-18 22:51:15,533 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 31 states. [2020-08-18 22:51:16,094 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:16,094 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2020-08-18 22:51:16,095 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-18 22:51:16,095 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 38 [2020-08-18 22:51:16,095 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:16,096 INFO L225 Difference]: With dead ends: 45 [2020-08-18 22:51:16,096 INFO L226 Difference]: Without dead ends: 40 [2020-08-18 22:51:16,097 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 [2020-08-18 22:51:16,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-18 22:51:16,100 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-08-18 22:51:16,100 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-18 22:51:16,100 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2020-08-18 22:51:16,100 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 38 [2020-08-18 22:51:16,101 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:16,101 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2020-08-18 22:51:16,101 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-18 22:51:16,101 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2020-08-18 22:51:16,101 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-18 22:51:16,101 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:16,101 INFO L422 BasicCegarLoop]: trace histogram [29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:16,101 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-18 22:51:16,101 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:16,102 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:16,102 INFO L82 PathProgramCache]: Analyzing trace with hash -770579951, now seen corresponding path program 29 times [2020-08-18 22:51:16,102 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:16,102 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [49433158] [2020-08-18 22:51:16,102 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:16,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:16,838 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:16,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:16,843 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:16,843 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [49433158] [2020-08-18 22:51:16,844 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:16,844 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-18 22:51:16,844 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [347951623] [2020-08-18 22:51:16,844 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-18 22:51:16,844 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:16,844 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-18 22:51:16,845 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=902, Unknown=0, NotChecked=0, Total=992 [2020-08-18 22:51:16,845 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 32 states. [2020-08-18 22:51:17,438 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:17,438 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2020-08-18 22:51:17,439 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-18 22:51:17,439 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 39 [2020-08-18 22:51:17,439 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:17,440 INFO L225 Difference]: With dead ends: 46 [2020-08-18 22:51:17,440 INFO L226 Difference]: Without dead ends: 41 [2020-08-18 22:51:17,441 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=90, Invalid=902, Unknown=0, NotChecked=0, Total=992 [2020-08-18 22:51:17,441 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-18 22:51:17,444 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-18 22:51:17,444 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-18 22:51:17,445 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-08-18 22:51:17,445 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 39 [2020-08-18 22:51:17,445 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:17,445 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-08-18 22:51:17,445 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-18 22:51:17,445 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-08-18 22:51:17,446 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-18 22:51:17,446 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:17,446 INFO L422 BasicCegarLoop]: trace histogram [30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:17,446 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-18 22:51:17,446 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:17,447 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:17,447 INFO L82 PathProgramCache]: Analyzing trace with hash 1918286558, now seen corresponding path program 30 times [2020-08-18 22:51:17,447 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:17,447 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1938969246] [2020-08-18 22:51:17,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:17,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:18,259 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:18,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:18,265 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:18,265 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1938969246] [2020-08-18 22:51:18,265 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:18,265 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-18 22:51:18,265 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1777635106] [2020-08-18 22:51:18,266 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-18 22:51:18,266 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:18,266 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-18 22:51:18,267 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 22:51:18,267 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 33 states. [2020-08-18 22:51:18,887 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:18,888 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2020-08-18 22:51:18,888 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-18 22:51:18,888 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 40 [2020-08-18 22:51:18,889 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:18,889 INFO L225 Difference]: With dead ends: 47 [2020-08-18 22:51:18,889 INFO L226 Difference]: Without dead ends: 42 [2020-08-18 22:51:18,890 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 [2020-08-18 22:51:18,891 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-18 22:51:18,893 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-08-18 22:51:18,893 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-18 22:51:18,894 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2020-08-18 22:51:18,894 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 40 [2020-08-18 22:51:18,894 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:18,894 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2020-08-18 22:51:18,894 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-18 22:51:18,894 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2020-08-18 22:51:18,895 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-18 22:51:18,895 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:18,895 INFO L422 BasicCegarLoop]: trace histogram [31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:18,895 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-18 22:51:18,895 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:18,896 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:18,896 INFO L82 PathProgramCache]: Analyzing trace with hash -626197583, now seen corresponding path program 31 times [2020-08-18 22:51:18,896 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:18,896 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [919734057] [2020-08-18 22:51:18,896 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:18,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:19,673 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:19,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:19,678 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:19,678 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [919734057] [2020-08-18 22:51:19,678 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:19,678 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-18 22:51:19,678 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1529209972] [2020-08-18 22:51:19,679 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-18 22:51:19,679 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:19,679 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-18 22:51:19,679 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 22:51:19,679 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 34 states. [2020-08-18 22:51:20,357 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:20,357 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2020-08-18 22:51:20,358 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-18 22:51:20,358 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 41 [2020-08-18 22:51:20,358 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:20,358 INFO L225 Difference]: With dead ends: 48 [2020-08-18 22:51:20,359 INFO L226 Difference]: Without dead ends: 43 [2020-08-18 22:51:20,359 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 [2020-08-18 22:51:20,360 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-18 22:51:20,363 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-18 22:51:20,363 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-18 22:51:20,363 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2020-08-18 22:51:20,364 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 41 [2020-08-18 22:51:20,364 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:20,364 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2020-08-18 22:51:20,364 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-18 22:51:20,364 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2020-08-18 22:51:20,365 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-18 22:51:20,365 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:20,365 INFO L422 BasicCegarLoop]: trace histogram [32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:20,365 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-18 22:51:20,365 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:20,365 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:20,366 INFO L82 PathProgramCache]: Analyzing trace with hash 2099172670, now seen corresponding path program 32 times [2020-08-18 22:51:20,366 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:20,366 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1867394673] [2020-08-18 22:51:20,366 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:20,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:21,294 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:21,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:21,299 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:21,299 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1867394673] [2020-08-18 22:51:21,299 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:21,299 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-18 22:51:21,299 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1183368257] [2020-08-18 22:51:21,300 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-18 22:51:21,300 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:21,300 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-18 22:51:21,301 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=1091, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 22:51:21,301 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 35 states. [2020-08-18 22:51:22,024 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:22,024 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2020-08-18 22:51:22,025 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-18 22:51:22,025 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 42 [2020-08-18 22:51:22,025 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:22,026 INFO L225 Difference]: With dead ends: 49 [2020-08-18 22:51:22,026 INFO L226 Difference]: Without dead ends: 44 [2020-08-18 22:51:22,027 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 [2020-08-18 22:51:22,027 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-18 22:51:22,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-08-18 22:51:22,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-18 22:51:22,030 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2020-08-18 22:51:22,030 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 42 [2020-08-18 22:51:22,030 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:22,031 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2020-08-18 22:51:22,031 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-18 22:51:22,031 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2020-08-18 22:51:22,031 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-18 22:51:22,031 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:22,031 INFO L422 BasicCegarLoop]: trace histogram [33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:22,032 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-18 22:51:22,032 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:22,032 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:22,032 INFO L82 PathProgramCache]: Analyzing trace with hash 686304593, now seen corresponding path program 33 times [2020-08-18 22:51:22,032 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:22,032 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1278777356] [2020-08-18 22:51:22,032 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:22,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:22,926 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:22,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:22,931 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:22,932 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1278777356] [2020-08-18 22:51:22,932 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:22,932 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-18 22:51:22,932 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1132447326] [2020-08-18 22:51:22,932 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-18 22:51:22,933 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:22,933 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-18 22:51:22,933 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2020-08-18 22:51:22,934 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 36 states. [2020-08-18 22:51:23,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:23,747 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-08-18 22:51:23,748 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-18 22:51:23,748 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 43 [2020-08-18 22:51:23,748 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:23,749 INFO L225 Difference]: With dead ends: 50 [2020-08-18 22:51:23,749 INFO L226 Difference]: Without dead ends: 45 [2020-08-18 22:51:23,749 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 [2020-08-18 22:51:23,750 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-18 22:51:23,753 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-08-18 22:51:23,753 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-18 22:51:23,754 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2020-08-18 22:51:23,754 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 43 [2020-08-18 22:51:23,754 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:23,754 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2020-08-18 22:51:23,755 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-18 22:51:23,755 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2020-08-18 22:51:23,755 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-18 22:51:23,755 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:23,755 INFO L422 BasicCegarLoop]: trace histogram [34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:23,756 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-18 22:51:23,756 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:23,756 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:23,756 INFO L82 PathProgramCache]: Analyzing trace with hash -162932834, now seen corresponding path program 34 times [2020-08-18 22:51:23,757 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:23,757 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [553567939] [2020-08-18 22:51:23,757 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:23,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:24,766 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:24,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:24,771 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:24,772 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [553567939] [2020-08-18 22:51:24,772 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:24,772 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-18 22:51:24,772 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1983076801] [2020-08-18 22:51:24,773 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-18 22:51:24,773 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:24,773 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-18 22:51:24,774 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=1227, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 22:51:24,774 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 37 states. [2020-08-18 22:51:25,589 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:25,589 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2020-08-18 22:51:25,590 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-18 22:51:25,590 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 44 [2020-08-18 22:51:25,590 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:25,591 INFO L225 Difference]: With dead ends: 51 [2020-08-18 22:51:25,591 INFO L226 Difference]: Without dead ends: 46 [2020-08-18 22:51:25,592 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=105, Invalid=1227, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 22:51:25,592 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-18 22:51:25,595 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-08-18 22:51:25,595 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-18 22:51:25,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2020-08-18 22:51:25,596 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 44 [2020-08-18 22:51:25,596 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:25,596 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2020-08-18 22:51:25,596 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-18 22:51:25,596 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2020-08-18 22:51:25,597 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-18 22:51:25,597 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:25,597 INFO L422 BasicCegarLoop]: trace histogram [35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:25,597 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-18 22:51:25,597 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:25,597 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:25,598 INFO L82 PathProgramCache]: Analyzing trace with hash -719489295, now seen corresponding path program 35 times [2020-08-18 22:51:25,598 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:25,598 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [584233780] [2020-08-18 22:51:25,598 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:25,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:26,622 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:26,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:26,627 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:26,627 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [584233780] [2020-08-18 22:51:26,628 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:26,628 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-18 22:51:26,628 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1368217018] [2020-08-18 22:51:26,628 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-18 22:51:26,628 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:26,628 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-18 22:51:26,629 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=1298, Unknown=0, NotChecked=0, Total=1406 [2020-08-18 22:51:26,629 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand 38 states. [2020-08-18 22:51:27,483 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:27,483 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2020-08-18 22:51:27,483 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-18 22:51:27,484 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 45 [2020-08-18 22:51:27,484 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:27,484 INFO L225 Difference]: With dead ends: 52 [2020-08-18 22:51:27,485 INFO L226 Difference]: Without dead ends: 47 [2020-08-18 22:51:27,485 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=108, Invalid=1298, Unknown=0, NotChecked=0, Total=1406 [2020-08-18 22:51:27,486 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-18 22:51:27,488 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-08-18 22:51:27,488 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-18 22:51:27,489 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2020-08-18 22:51:27,489 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 45 [2020-08-18 22:51:27,489 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:27,489 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2020-08-18 22:51:27,489 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-18 22:51:27,489 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2020-08-18 22:51:27,490 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-18 22:51:27,490 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:27,490 INFO L422 BasicCegarLoop]: trace histogram [36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:27,490 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-18 22:51:27,490 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:27,490 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:27,491 INFO L82 PathProgramCache]: Analyzing trace with hash -792870402, now seen corresponding path program 36 times [2020-08-18 22:51:27,491 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:27,491 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1088203620] [2020-08-18 22:51:27,491 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:27,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:28,537 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:28,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:28,542 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:28,542 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1088203620] [2020-08-18 22:51:28,543 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:28,543 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-18 22:51:28,543 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1756232383] [2020-08-18 22:51:28,543 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-18 22:51:28,543 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:28,543 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-18 22:51:28,544 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 22:51:28,544 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 39 states. [2020-08-18 22:51:29,473 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:29,473 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2020-08-18 22:51:29,474 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-18 22:51:29,474 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 46 [2020-08-18 22:51:29,474 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:29,475 INFO L225 Difference]: With dead ends: 53 [2020-08-18 22:51:29,475 INFO L226 Difference]: Without dead ends: 48 [2020-08-18 22:51:29,476 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 22:51:29,476 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-18 22:51:29,479 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-08-18 22:51:29,479 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-18 22:51:29,479 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2020-08-18 22:51:29,480 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 46 [2020-08-18 22:51:29,480 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:29,480 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2020-08-18 22:51:29,480 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-18 22:51:29,480 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2020-08-18 22:51:29,481 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-18 22:51:29,481 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:29,481 INFO L422 BasicCegarLoop]: trace histogram [37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:29,481 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-18 22:51:29,481 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:29,481 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:29,482 INFO L82 PathProgramCache]: Analyzing trace with hash 1227282577, now seen corresponding path program 37 times [2020-08-18 22:51:29,482 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:29,482 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [298791705] [2020-08-18 22:51:29,482 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:29,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:30,615 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:30,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:30,620 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:30,620 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [298791705] [2020-08-18 22:51:30,620 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:30,621 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-18 22:51:30,621 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [572577944] [2020-08-18 22:51:30,621 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-18 22:51:30,621 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:30,621 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-18 22:51:30,622 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=1446, Unknown=0, NotChecked=0, Total=1560 [2020-08-18 22:51:30,622 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 40 states. [2020-08-18 22:51:31,586 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:31,586 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2020-08-18 22:51:31,586 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-18 22:51:31,587 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 47 [2020-08-18 22:51:31,587 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:31,588 INFO L225 Difference]: With dead ends: 54 [2020-08-18 22:51:31,588 INFO L226 Difference]: Without dead ends: 49 [2020-08-18 22:51:31,589 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 [2020-08-18 22:51:31,590 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-18 22:51:31,592 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-18 22:51:31,592 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-18 22:51:31,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2020-08-18 22:51:31,593 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 47 [2020-08-18 22:51:31,593 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:31,593 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2020-08-18 22:51:31,593 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-18 22:51:31,593 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2020-08-18 22:51:31,593 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-18 22:51:31,594 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:31,594 INFO L422 BasicCegarLoop]: trace histogram [38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:31,594 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-18 22:51:31,594 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:31,594 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:31,594 INFO L82 PathProgramCache]: Analyzing trace with hash -572484514, now seen corresponding path program 38 times [2020-08-18 22:51:31,595 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:31,595 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [485397521] [2020-08-18 22:51:31,595 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:31,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:32,751 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:32,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:32,760 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:32,761 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [485397521] [2020-08-18 22:51:32,761 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:32,761 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-18 22:51:32,761 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [167078224] [2020-08-18 22:51:32,762 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-18 22:51:32,762 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:32,762 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-18 22:51:32,763 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=1523, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 22:51:32,763 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 41 states. [2020-08-18 22:51:33,790 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:33,790 INFO L93 Difference]: Finished difference Result 55 states and 55 transitions. [2020-08-18 22:51:33,791 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-18 22:51:33,791 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 48 [2020-08-18 22:51:33,792 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:33,792 INFO L225 Difference]: With dead ends: 55 [2020-08-18 22:51:33,792 INFO L226 Difference]: Without dead ends: 50 [2020-08-18 22:51:33,794 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=117, Invalid=1523, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 22:51:33,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-08-18 22:51:33,796 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2020-08-18 22:51:33,796 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-08-18 22:51:33,796 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2020-08-18 22:51:33,797 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 48 [2020-08-18 22:51:33,797 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:33,797 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2020-08-18 22:51:33,797 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-18 22:51:33,797 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2020-08-18 22:51:33,797 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-08-18 22:51:33,797 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:33,797 INFO L422 BasicCegarLoop]: trace histogram [39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:33,798 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-18 22:51:33,798 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:33,798 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:33,798 INFO L82 PathProgramCache]: Analyzing trace with hash -530689487, now seen corresponding path program 39 times [2020-08-18 22:51:33,798 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:33,798 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [464387408] [2020-08-18 22:51:33,798 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:33,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:35,073 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:35,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:35,079 INFO L134 CoverageAnalysis]: Checked inductivity of 780 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:35,080 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [464387408] [2020-08-18 22:51:35,080 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:35,080 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-18 22:51:35,080 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2068029862] [2020-08-18 22:51:35,080 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-18 22:51:35,081 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:35,081 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-18 22:51:35,081 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=1602, Unknown=0, NotChecked=0, Total=1722 [2020-08-18 22:51:35,082 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand 42 states. [2020-08-18 22:51:36,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:36,144 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2020-08-18 22:51:36,144 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-18 22:51:36,145 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 49 [2020-08-18 22:51:36,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:36,145 INFO L225 Difference]: With dead ends: 56 [2020-08-18 22:51:36,146 INFO L226 Difference]: Without dead ends: 51 [2020-08-18 22:51:36,147 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=120, Invalid=1602, Unknown=0, NotChecked=0, Total=1722 [2020-08-18 22:51:36,147 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-08-18 22:51:36,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2020-08-18 22:51:36,149 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-18 22:51:36,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2020-08-18 22:51:36,150 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 49 [2020-08-18 22:51:36,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:36,150 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2020-08-18 22:51:36,150 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-18 22:51:36,151 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2020-08-18 22:51:36,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-18 22:51:36,151 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:36,151 INFO L422 BasicCegarLoop]: trace histogram [40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:36,151 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-18 22:51:36,151 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:36,152 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:36,152 INFO L82 PathProgramCache]: Analyzing trace with hash 764956350, now seen corresponding path program 40 times [2020-08-18 22:51:36,152 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:36,152 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1876255590] [2020-08-18 22:51:36,152 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:36,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:37,505 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:37,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:37,510 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 0 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:37,510 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1876255590] [2020-08-18 22:51:37,510 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:37,510 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-18 22:51:37,510 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [561563491] [2020-08-18 22:51:37,511 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-18 22:51:37,511 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:37,511 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-18 22:51:37,511 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=1683, Unknown=0, NotChecked=0, Total=1806 [2020-08-18 22:51:37,511 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 43 states. [2020-08-18 22:51:38,640 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:38,640 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2020-08-18 22:51:38,641 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-18 22:51:38,641 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 50 [2020-08-18 22:51:38,641 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:38,642 INFO L225 Difference]: With dead ends: 57 [2020-08-18 22:51:38,642 INFO L226 Difference]: Without dead ends: 52 [2020-08-18 22:51:38,643 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 [2020-08-18 22:51:38,643 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-18 22:51:38,646 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2020-08-18 22:51:38,646 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-18 22:51:38,647 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2020-08-18 22:51:38,647 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 50 [2020-08-18 22:51:38,647 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:38,647 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2020-08-18 22:51:38,647 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-18 22:51:38,647 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2020-08-18 22:51:38,648 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-08-18 22:51:38,648 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:38,648 INFO L422 BasicCegarLoop]: trace histogram [41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:38,648 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-18 22:51:38,648 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:38,648 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:38,648 INFO L82 PathProgramCache]: Analyzing trace with hash -2019695663, now seen corresponding path program 41 times [2020-08-18 22:51:38,649 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:38,649 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [637058619] [2020-08-18 22:51:38,649 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:38,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:39,947 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:39,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:39,953 INFO L134 CoverageAnalysis]: Checked inductivity of 861 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:39,953 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [637058619] [2020-08-18 22:51:39,953 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:39,953 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-08-18 22:51:39,953 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1139931400] [2020-08-18 22:51:39,953 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-08-18 22:51:39,954 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:39,954 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-08-18 22:51:39,954 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=1766, Unknown=0, NotChecked=0, Total=1892 [2020-08-18 22:51:39,954 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 44 states. [2020-08-18 22:51:41,172 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:41,172 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2020-08-18 22:51:41,173 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-08-18 22:51:41,173 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 51 [2020-08-18 22:51:41,173 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:41,174 INFO L225 Difference]: With dead ends: 58 [2020-08-18 22:51:41,174 INFO L226 Difference]: Without dead ends: 53 [2020-08-18 22:51:41,176 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 [2020-08-18 22:51:41,176 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-18 22:51:41,179 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2020-08-18 22:51:41,179 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-18 22:51:41,180 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2020-08-18 22:51:41,180 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 51 [2020-08-18 22:51:41,180 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:41,180 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2020-08-18 22:51:41,180 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-08-18 22:51:41,180 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2020-08-18 22:51:41,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-18 22:51:41,181 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:41,181 INFO L422 BasicCegarLoop]: trace histogram [42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:41,181 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-18 22:51:41,181 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:41,181 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:41,182 INFO L82 PathProgramCache]: Analyzing trace with hash 1850405150, now seen corresponding path program 42 times [2020-08-18 22:51:41,182 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:41,182 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [769531989] [2020-08-18 22:51:41,182 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:41,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:42,606 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:42,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:42,612 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 0 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:42,613 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [769531989] [2020-08-18 22:51:42,613 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:42,613 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-08-18 22:51:42,613 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1028468714] [2020-08-18 22:51:42,613 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-08-18 22:51:42,614 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:42,614 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-08-18 22:51:42,614 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=1851, Unknown=0, NotChecked=0, Total=1980 [2020-08-18 22:51:42,615 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 45 states. [2020-08-18 22:51:43,892 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:43,892 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2020-08-18 22:51:43,894 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-08-18 22:51:43,894 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 52 [2020-08-18 22:51:43,894 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:43,895 INFO L225 Difference]: With dead ends: 59 [2020-08-18 22:51:43,895 INFO L226 Difference]: Without dead ends: 54 [2020-08-18 22:51:43,896 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=129, Invalid=1851, Unknown=0, NotChecked=0, Total=1980 [2020-08-18 22:51:43,896 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-18 22:51:43,899 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2020-08-18 22:51:43,899 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-18 22:51:43,899 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2020-08-18 22:51:43,900 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 52 [2020-08-18 22:51:43,900 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:43,900 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2020-08-18 22:51:43,900 INFO L480 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-08-18 22:51:43,900 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2020-08-18 22:51:43,901 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-08-18 22:51:43,901 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:43,901 INFO L422 BasicCegarLoop]: trace histogram [43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:43,901 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2020-08-18 22:51:43,901 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:43,901 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:43,902 INFO L82 PathProgramCache]: Analyzing trace with hash 1564446065, now seen corresponding path program 43 times [2020-08-18 22:51:43,902 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:43,902 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1810977667] [2020-08-18 22:51:43,902 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:43,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:45,346 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:45,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:45,352 INFO L134 CoverageAnalysis]: Checked inductivity of 946 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:45,352 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1810977667] [2020-08-18 22:51:45,352 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:45,352 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46] total 46 [2020-08-18 22:51:45,353 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [500252355] [2020-08-18 22:51:45,353 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-08-18 22:51:45,353 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:45,353 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-08-18 22:51:45,354 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=1938, Unknown=0, NotChecked=0, Total=2070 [2020-08-18 22:51:45,354 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand 46 states. [2020-08-18 22:51:46,696 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:46,696 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2020-08-18 22:51:46,697 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-08-18 22:51:46,697 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 53 [2020-08-18 22:51:46,697 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:46,698 INFO L225 Difference]: With dead ends: 60 [2020-08-18 22:51:46,698 INFO L226 Difference]: Without dead ends: 55 [2020-08-18 22:51:46,699 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 [2020-08-18 22:51:46,699 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-18 22:51:46,702 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2020-08-18 22:51:46,702 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-18 22:51:46,702 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2020-08-18 22:51:46,702 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 53 [2020-08-18 22:51:46,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:46,703 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2020-08-18 22:51:46,703 INFO L480 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-08-18 22:51:46,703 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2020-08-18 22:51:46,703 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-18 22:51:46,703 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:46,703 INFO L422 BasicCegarLoop]: trace histogram [44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:46,704 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2020-08-18 22:51:46,704 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:46,704 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:46,704 INFO L82 PathProgramCache]: Analyzing trace with hash 1289649022, now seen corresponding path program 44 times [2020-08-18 22:51:46,704 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:46,704 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [486104251] [2020-08-18 22:51:46,704 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:46,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:48,248 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:48,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:48,254 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:48,254 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [486104251] [2020-08-18 22:51:48,254 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:48,255 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47] total 47 [2020-08-18 22:51:48,255 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [280830605] [2020-08-18 22:51:48,255 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-08-18 22:51:48,255 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:48,255 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-08-18 22:51:48,256 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=2027, Unknown=0, NotChecked=0, Total=2162 [2020-08-18 22:51:48,256 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 47 states. [2020-08-18 22:51:49,648 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:49,648 INFO L93 Difference]: Finished difference Result 61 states and 61 transitions. [2020-08-18 22:51:49,648 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2020-08-18 22:51:49,649 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 54 [2020-08-18 22:51:49,649 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:49,650 INFO L225 Difference]: With dead ends: 61 [2020-08-18 22:51:49,650 INFO L226 Difference]: Without dead ends: 56 [2020-08-18 22:51:49,650 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=135, Invalid=2027, Unknown=0, NotChecked=0, Total=2162 [2020-08-18 22:51:49,650 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-18 22:51:49,654 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2020-08-18 22:51:49,654 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-08-18 22:51:49,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 56 transitions. [2020-08-18 22:51:49,654 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 56 transitions. Word has length 54 [2020-08-18 22:51:49,655 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:49,655 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 56 transitions. [2020-08-18 22:51:49,655 INFO L480 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-08-18 22:51:49,655 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 56 transitions. [2020-08-18 22:51:49,655 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-08-18 22:51:49,656 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:49,656 INFO L422 BasicCegarLoop]: trace histogram [45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:49,656 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2020-08-18 22:51:49,656 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:49,656 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:49,656 INFO L82 PathProgramCache]: Analyzing trace with hash 1360875281, now seen corresponding path program 45 times [2020-08-18 22:51:49,657 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:49,657 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [281302919] [2020-08-18 22:51:49,657 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:49,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:51,234 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:51,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:51,241 INFO L134 CoverageAnalysis]: Checked inductivity of 1035 backedges. 0 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:51,241 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [281302919] [2020-08-18 22:51:51,241 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:51,241 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48] total 48 [2020-08-18 22:51:51,241 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [878175283] [2020-08-18 22:51:51,241 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-08-18 22:51:51,242 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:51,242 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-08-18 22:51:51,242 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=2118, Unknown=0, NotChecked=0, Total=2256 [2020-08-18 22:51:51,242 INFO L87 Difference]: Start difference. First operand 56 states and 56 transitions. Second operand 48 states. [2020-08-18 22:51:52,655 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:52,656 INFO L93 Difference]: Finished difference Result 62 states and 62 transitions. [2020-08-18 22:51:52,656 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-08-18 22:51:52,656 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 55 [2020-08-18 22:51:52,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:52,657 INFO L225 Difference]: With dead ends: 62 [2020-08-18 22:51:52,658 INFO L226 Difference]: Without dead ends: 57 [2020-08-18 22:51:52,658 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=138, Invalid=2118, Unknown=0, NotChecked=0, Total=2256 [2020-08-18 22:51:52,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-08-18 22:51:52,661 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2020-08-18 22:51:52,661 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-18 22:51:52,662 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2020-08-18 22:51:52,662 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 55 [2020-08-18 22:51:52,662 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:52,662 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2020-08-18 22:51:52,662 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-08-18 22:51:52,662 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2020-08-18 22:51:52,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-18 22:51:52,663 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:52,663 INFO L422 BasicCegarLoop]: trace histogram [46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:52,663 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2020-08-18 22:51:52,663 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:52,663 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:52,664 INFO L82 PathProgramCache]: Analyzing trace with hash -726077986, now seen corresponding path program 46 times [2020-08-18 22:51:52,664 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:52,664 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1285356253] [2020-08-18 22:51:52,664 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:52,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:54,447 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:54,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:54,455 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:54,455 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1285356253] [2020-08-18 22:51:54,455 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:54,455 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49] total 49 [2020-08-18 22:51:54,455 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [115047789] [2020-08-18 22:51:54,456 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2020-08-18 22:51:54,456 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:54,456 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2020-08-18 22:51:54,457 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=2211, Unknown=0, NotChecked=0, Total=2352 [2020-08-18 22:51:54,457 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 49 states. [2020-08-18 22:51:55,967 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:55,968 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2020-08-18 22:51:55,968 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2020-08-18 22:51:55,968 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 56 [2020-08-18 22:51:55,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:55,969 INFO L225 Difference]: With dead ends: 63 [2020-08-18 22:51:55,969 INFO L226 Difference]: Without dead ends: 58 [2020-08-18 22:51:55,969 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=141, Invalid=2211, Unknown=0, NotChecked=0, Total=2352 [2020-08-18 22:51:55,970 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-18 22:51:55,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2020-08-18 22:51:55,972 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-08-18 22:51:55,973 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 58 transitions. [2020-08-18 22:51:55,973 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 58 transitions. Word has length 56 [2020-08-18 22:51:55,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:55,973 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 58 transitions. [2020-08-18 22:51:55,974 INFO L480 AbstractCegarLoop]: Interpolant automaton has 49 states. [2020-08-18 22:51:55,974 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 58 transitions. [2020-08-18 22:51:55,974 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-08-18 22:51:55,974 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:55,974 INFO L422 BasicCegarLoop]: trace histogram [47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:55,974 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2020-08-18 22:51:55,974 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:55,974 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:55,975 INFO L82 PathProgramCache]: Analyzing trace with hash -997119823, now seen corresponding path program 47 times [2020-08-18 22:51:55,975 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:55,975 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [765772934] [2020-08-18 22:51:55,975 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:55,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:57,724 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:57,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:57,731 INFO L134 CoverageAnalysis]: Checked inductivity of 1128 backedges. 0 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:57,732 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [765772934] [2020-08-18 22:51:57,732 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:57,732 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50] total 50 [2020-08-18 22:51:57,732 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [583568413] [2020-08-18 22:51:57,732 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-08-18 22:51:57,732 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:57,733 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-08-18 22:51:57,733 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=2306, Unknown=0, NotChecked=0, Total=2450 [2020-08-18 22:51:57,733 INFO L87 Difference]: Start difference. First operand 58 states and 58 transitions. Second operand 50 states.