/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=HIGHLEXORDER --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-lit/cggmp2005b.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 19:05:02,408 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 19:05:02,416 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 19:05:02,446 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 19:05:02,446 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 19:05:02,448 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 19:05:02,449 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 19:05:02,450 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 19:05:02,452 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 19:05:02,453 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 19:05:02,454 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 19:05:02,455 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 19:05:02,456 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 19:05:02,457 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 19:05:02,458 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 19:05:02,459 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 19:05:02,460 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 19:05:02,461 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 19:05:02,463 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 19:05:02,465 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 19:05:02,467 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 19:05:02,468 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 19:05:02,470 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 19:05:02,471 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 19:05:02,473 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-21 19:05:02,474 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-21 19:05:02,474 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-21 19:05:02,475 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-21 19:05:02,476 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-21 19:05:02,477 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-21 19:05:02,477 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-21 19:05:02,478 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-21 19:05:02,479 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-21 19:05:02,479 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-21 19:05:02,480 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-21 19:05:02,481 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-21 19:05:02,481 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-21 19:05:02,482 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-21 19:05:02,482 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 19:05:02,483 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 19:05:02,484 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 19:05:02,484 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-21 19:05:02,509 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 19:05:02,510 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 19:05:02,511 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 19:05:02,511 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 19:05:02,511 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 19:05:02,512 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 19:05:02,512 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 19:05:02,512 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 19:05:02,512 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 19:05:02,512 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 19:05:02,513 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 19:05:02,513 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 19:05:02,513 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 19:05:02,513 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 19:05:02,513 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 19:05:02,513 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 19:05:02,514 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 19:05:02,514 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 19:05:02,514 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 19:05:02,514 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 19:05:02,514 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 19:05:02,515 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 19:05:02,515 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 19:05:02,515 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 19:05:02,515 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 19:05:02,515 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 19:05:02,516 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 19:05:02,516 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 19:05:02,516 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 19:05:02,516 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=HIGHLEXORDER;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=HIGHLEXORDER;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=HIGHLEXORDER;log-additional-information=true; [2020-08-21 19:05:02,815 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 19:05:02,829 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 19:05:02,832 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 19:05:02,835 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 19:05:02,837 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 19:05:02,838 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/cggmp2005b.i [2020-08-21 19:05:02,904 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/6f7e1d9fd/5fa343658b204208be62f27332138124/FLAG1989fc534 [2020-08-21 19:05:03,362 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 19:05:03,362 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-lit/cggmp2005b.i [2020-08-21 19:05:03,371 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/6f7e1d9fd/5fa343658b204208be62f27332138124/FLAG1989fc534 [2020-08-21 19:05:03,725 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/6f7e1d9fd/5fa343658b204208be62f27332138124 [2020-08-21 19:05:03,734 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 19:05:03,735 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 19:05:03,736 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 19:05:03,737 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 19:05:03,740 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 19:05:03,741 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 07:05:03" (1/1) ... [2020-08-21 19:05:03,745 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3d8d98d5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:05:03, skipping insertion in model container [2020-08-21 19:05:03,745 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 07:05:03" (1/1) ... [2020-08-21 19:05:03,753 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 19:05:03,771 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 19:05:03,918 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 19:05:03,923 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 19:05:03,940 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 19:05:03,955 INFO L208 MainTranslator]: Completed translation [2020-08-21 19:05:03,956 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:05:03 WrapperNode [2020-08-21 19:05:03,956 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 19:05:03,957 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 19:05:03,957 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 19:05:03,957 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 19:05:03,971 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:05:03" (1/1) ... [2020-08-21 19:05:03,972 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:05:03" (1/1) ... [2020-08-21 19:05:03,976 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:05:03" (1/1) ... [2020-08-21 19:05:03,976 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:05:03" (1/1) ... [2020-08-21 19:05:03,980 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:05:03" (1/1) ... [2020-08-21 19:05:03,986 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:05:03" (1/1) ... [2020-08-21 19:05:03,987 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:05:03" (1/1) ... [2020-08-21 19:05:04,068 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 19:05:04,069 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 19:05:04,069 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 19:05:04,069 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 19:05:04,070 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:05:03" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 19:05:04,129 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 19:05:04,129 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 19:05:04,129 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-21 19:05:04,130 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-21 19:05:04,130 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 19:05:04,130 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 19:05:04,130 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-21 19:05:04,130 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-21 19:05:04,130 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-21 19:05:04,131 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-21 19:05:04,131 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 19:05:04,131 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 19:05:04,131 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 19:05:04,316 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 19:05:04,317 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-21 19:05:04,320 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 07:05:04 BoogieIcfgContainer [2020-08-21 19:05:04,321 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 19:05:04,322 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 19:05:04,322 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 19:05:04,325 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 19:05:04,326 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 07:05:03" (1/3) ... [2020-08-21 19:05:04,327 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@420ae7ee and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 07:05:04, skipping insertion in model container [2020-08-21 19:05:04,327 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:05:03" (2/3) ... [2020-08-21 19:05:04,327 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@420ae7ee and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 07:05:04, skipping insertion in model container [2020-08-21 19:05:04,327 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 07:05:04" (3/3) ... [2020-08-21 19:05:04,329 INFO L109 eAbstractionObserver]: Analyzing ICFG cggmp2005b.i [2020-08-21 19:05:04,340 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 19:05:04,348 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 19:05:04,361 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 19:05:04,385 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 19:05:04,386 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 19:05:04,386 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 19:05:04,386 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 19:05:04,386 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 19:05:04,386 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 19:05:04,387 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 19:05:04,387 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 19:05:04,406 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2020-08-21 19:05:04,412 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-21 19:05:04,412 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:05:04,414 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:05:04,414 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:05:04,420 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:05:04,420 INFO L82 PathProgramCache]: Analyzing trace with hash -1039733575, now seen corresponding path program 1 times [2020-08-21 19:05:04,427 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:05:04,427 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1176108180] [2020-08-21 19:05:04,427 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:05:04,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:04,536 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:05:04,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:04,542 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:05:04,543 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1176108180] [2020-08-21 19:05:04,545 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 19:05:04,545 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-08-21 19:05:04,546 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [852703662] [2020-08-21 19:05:04,551 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-08-21 19:05:04,551 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:05:04,566 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-08-21 19:05:04,567 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-21 19:05:04,569 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 2 states. [2020-08-21 19:05:04,595 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:05:04,595 INFO L93 Difference]: Finished difference Result 37 states and 50 transitions. [2020-08-21 19:05:04,595 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-08-21 19:05:04,597 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2020-08-21 19:05:04,597 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:05:04,606 INFO L225 Difference]: With dead ends: 37 [2020-08-21 19:05:04,606 INFO L226 Difference]: Without dead ends: 14 [2020-08-21 19:05:04,610 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-21 19:05:04,629 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-08-21 19:05:04,648 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-08-21 19:05:04,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-08-21 19:05:04,651 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2020-08-21 19:05:04,654 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 10 [2020-08-21 19:05:04,655 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:05:04,655 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2020-08-21 19:05:04,655 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-08-21 19:05:04,655 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2020-08-21 19:05:04,657 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-21 19:05:04,657 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:05:04,657 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:05:04,658 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 19:05:04,658 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:05:04,659 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:05:04,659 INFO L82 PathProgramCache]: Analyzing trace with hash -1066515684, now seen corresponding path program 1 times [2020-08-21 19:05:04,659 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:05:04,660 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1422358204] [2020-08-21 19:05:04,660 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:05:04,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:04,713 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:05:04,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:04,717 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:05:04,717 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1422358204] [2020-08-21 19:05:04,718 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 19:05:04,718 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 19:05:04,718 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1277431045] [2020-08-21 19:05:04,720 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 19:05:04,720 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:05:04,721 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 19:05:04,721 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 19:05:04,721 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand 3 states. [2020-08-21 19:05:04,743 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:05:04,744 INFO L93 Difference]: Finished difference Result 20 states and 22 transitions. [2020-08-21 19:05:04,744 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 19:05:04,745 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-08-21 19:05:04,745 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:05:04,746 INFO L225 Difference]: With dead ends: 20 [2020-08-21 19:05:04,746 INFO L226 Difference]: Without dead ends: 15 [2020-08-21 19:05:04,747 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 [2020-08-21 19:05:04,748 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-21 19:05:04,751 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-21 19:05:04,751 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-21 19:05:04,752 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-08-21 19:05:04,752 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 10 [2020-08-21 19:05:04,753 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:05:04,753 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-08-21 19:05:04,753 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 19:05:04,753 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-08-21 19:05:04,754 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-21 19:05:04,754 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:05:04,754 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:05:04,754 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 19:05:04,755 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:05:04,755 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:05:04,755 INFO L82 PathProgramCache]: Analyzing trace with hash 1875131310, now seen corresponding path program 1 times [2020-08-21 19:05:04,756 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:05:04,756 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1032099423] [2020-08-21 19:05:04,756 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:05:04,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:04,791 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:05:04,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:04,797 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:05:04,798 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1032099423] [2020-08-21 19:05:04,799 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 19:05:04,799 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 19:05:04,800 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [647724447] [2020-08-21 19:05:04,800 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 19:05:04,801 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:05:04,801 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 19:05:04,801 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 19:05:04,802 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 3 states. [2020-08-21 19:05:04,816 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:05:04,817 INFO L93 Difference]: Finished difference Result 25 states and 30 transitions. [2020-08-21 19:05:04,818 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 19:05:04,818 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 14 [2020-08-21 19:05:04,819 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:05:04,819 INFO L225 Difference]: With dead ends: 25 [2020-08-21 19:05:04,820 INFO L226 Difference]: Without dead ends: 16 [2020-08-21 19:05:04,821 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 [2020-08-21 19:05:04,822 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-21 19:05:04,826 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-21 19:05:04,826 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-21 19:05:04,827 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-08-21 19:05:04,828 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 14 [2020-08-21 19:05:04,828 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:05:04,828 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-08-21 19:05:04,829 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 19:05:04,829 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-08-21 19:05:04,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-21 19:05:04,830 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:05:04,830 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:05:04,831 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 19:05:04,831 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:05:04,831 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:05:04,832 INFO L82 PathProgramCache]: Analyzing trace with hash -224898986, now seen corresponding path program 1 times [2020-08-21 19:05:04,832 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:05:04,832 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2144049666] [2020-08-21 19:05:04,833 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:05:04,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:04,887 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:05:04,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:04,893 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:05:04,893 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2144049666] [2020-08-21 19:05:04,894 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:05:04,894 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-21 19:05:04,894 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [394027694] [2020-08-21 19:05:04,895 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 19:05:04,895 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:05:04,896 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 19:05:04,896 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-21 19:05:04,896 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 5 states. [2020-08-21 19:05:04,958 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:05:04,958 INFO L93 Difference]: Finished difference Result 26 states and 31 transitions. [2020-08-21 19:05:04,959 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 19:05:04,959 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 15 [2020-08-21 19:05:04,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:05:04,960 INFO L225 Difference]: With dead ends: 26 [2020-08-21 19:05:04,960 INFO L226 Difference]: Without dead ends: 17 [2020-08-21 19:05:04,961 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2020-08-21 19:05:04,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-21 19:05:04,966 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-21 19:05:04,966 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-21 19:05:04,967 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2020-08-21 19:05:04,968 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 15 [2020-08-21 19:05:04,968 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:05:04,968 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2020-08-21 19:05:04,968 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 19:05:04,969 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2020-08-21 19:05:04,969 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-21 19:05:04,969 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:05:04,970 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:05:04,970 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 19:05:04,970 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:05:04,970 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:05:04,971 INFO L82 PathProgramCache]: Analyzing trace with hash -901328722, now seen corresponding path program 2 times [2020-08-21 19:05:04,971 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:05:04,971 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1217242000] [2020-08-21 19:05:04,972 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:05:04,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:05,062 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:05:05,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:05,067 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:05:05,068 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1217242000] [2020-08-21 19:05:05,068 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:05:05,068 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 19:05:05,069 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [326106275] [2020-08-21 19:05:05,069 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 19:05:05,070 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:05:05,070 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 19:05:05,070 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-21 19:05:05,070 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand 6 states. [2020-08-21 19:05:05,196 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:05:05,196 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-08-21 19:05:05,196 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 19:05:05,197 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 16 [2020-08-21 19:05:05,197 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:05:05,197 INFO L225 Difference]: With dead ends: 27 [2020-08-21 19:05:05,197 INFO L226 Difference]: Without dead ends: 18 [2020-08-21 19:05:05,198 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2020-08-21 19:05:05,198 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-21 19:05:05,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-08-21 19:05:05,203 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-21 19:05:05,204 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2020-08-21 19:05:05,204 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 16 [2020-08-21 19:05:05,204 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:05:05,204 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2020-08-21 19:05:05,205 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 19:05:05,205 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2020-08-21 19:05:05,205 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-21 19:05:05,206 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:05:05,206 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:05:05,206 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 19:05:05,206 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:05:05,207 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:05:05,209 INFO L82 PathProgramCache]: Analyzing trace with hash -395814058, now seen corresponding path program 3 times [2020-08-21 19:05:05,210 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:05:05,210 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [546564433] [2020-08-21 19:05:05,210 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:05:05,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:05,331 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:05:05,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:05,336 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:05:05,336 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [546564433] [2020-08-21 19:05:05,336 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:05:05,337 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 19:05:05,337 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [911408308] [2020-08-21 19:05:05,337 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 19:05:05,338 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:05:05,338 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 19:05:05,338 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-08-21 19:05:05,339 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 7 states. [2020-08-21 19:05:05,451 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:05:05,451 INFO L93 Difference]: Finished difference Result 28 states and 33 transitions. [2020-08-21 19:05:05,452 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 19:05:05,452 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 17 [2020-08-21 19:05:05,452 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:05:05,453 INFO L225 Difference]: With dead ends: 28 [2020-08-21 19:05:05,453 INFO L226 Difference]: Without dead ends: 19 [2020-08-21 19:05:05,454 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2020-08-21 19:05:05,455 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-08-21 19:05:05,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-08-21 19:05:05,460 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-21 19:05:05,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2020-08-21 19:05:05,461 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 17 [2020-08-21 19:05:05,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:05:05,462 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2020-08-21 19:05:05,462 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 19:05:05,462 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2020-08-21 19:05:05,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-21 19:05:05,463 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:05:05,463 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:05:05,463 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 19:05:05,464 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:05:05,464 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:05:05,464 INFO L82 PathProgramCache]: Analyzing trace with hash -1904728658, now seen corresponding path program 4 times [2020-08-21 19:05:05,465 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:05:05,465 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2006962356] [2020-08-21 19:05:05,465 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:05:05,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:05,565 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:05:05,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:05,569 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:05:05,569 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2006962356] [2020-08-21 19:05:05,570 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:05:05,570 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 19:05:05,570 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1451791619] [2020-08-21 19:05:05,571 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 19:05:05,571 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:05:05,571 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 19:05:05,572 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-08-21 19:05:05,572 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand 8 states. [2020-08-21 19:05:05,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:05:05,694 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-08-21 19:05:05,698 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 19:05:05,698 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 18 [2020-08-21 19:05:05,698 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:05:05,699 INFO L225 Difference]: With dead ends: 29 [2020-08-21 19:05:05,699 INFO L226 Difference]: Without dead ends: 20 [2020-08-21 19:05:05,700 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=54, Invalid=102, Unknown=0, NotChecked=0, Total=156 [2020-08-21 19:05:05,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-21 19:05:05,704 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-21 19:05:05,705 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-21 19:05:05,705 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2020-08-21 19:05:05,706 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 18 [2020-08-21 19:05:05,706 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:05:05,706 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2020-08-21 19:05:05,706 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 19:05:05,707 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2020-08-21 19:05:05,707 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-21 19:05:05,707 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:05:05,707 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:05:05,708 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 19:05:05,708 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:05:05,708 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:05:05,708 INFO L82 PathProgramCache]: Analyzing trace with hash -1436441002, now seen corresponding path program 5 times [2020-08-21 19:05:05,709 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:05:05,709 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1869580433] [2020-08-21 19:05:05,709 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:05:05,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:05,786 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:05:05,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:05,789 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 1 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:05:05,790 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1869580433] [2020-08-21 19:05:05,790 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:05:05,790 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 19:05:05,791 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [701030699] [2020-08-21 19:05:05,791 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 19:05:05,791 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:05:05,792 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 19:05:05,792 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2020-08-21 19:05:05,792 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 9 states. [2020-08-21 19:05:05,954 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:05:05,954 INFO L93 Difference]: Finished difference Result 30 states and 35 transitions. [2020-08-21 19:05:05,954 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 19:05:05,955 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2020-08-21 19:05:05,955 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:05:05,955 INFO L225 Difference]: With dead ends: 30 [2020-08-21 19:05:05,956 INFO L226 Difference]: Without dead ends: 21 [2020-08-21 19:05:05,956 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=70, Invalid=140, Unknown=0, NotChecked=0, Total=210 [2020-08-21 19:05:05,957 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-21 19:05:05,961 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-21 19:05:05,961 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-21 19:05:05,962 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2020-08-21 19:05:05,962 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 19 [2020-08-21 19:05:05,963 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:05:05,963 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2020-08-21 19:05:05,963 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 19:05:05,963 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2020-08-21 19:05:05,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-21 19:05:05,964 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:05:05,964 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:05:05,964 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 19:05:05,964 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:05:05,965 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:05:05,965 INFO L82 PathProgramCache]: Analyzing trace with hash 195574446, now seen corresponding path program 6 times [2020-08-21 19:05:05,965 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:05:05,965 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [766783742] [2020-08-21 19:05:05,966 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:05:05,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:06,000 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:05:06,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:06,002 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-21 19:05:06,003 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [766783742] [2020-08-21 19:05:06,003 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:05:06,003 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-08-21 19:05:06,003 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1219769774] [2020-08-21 19:05:06,004 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 19:05:06,004 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:05:06,004 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 19:05:06,005 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-21 19:05:06,005 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand 4 states. [2020-08-21 19:05:06,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:05:06,020 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2020-08-21 19:05:06,020 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 19:05:06,021 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2020-08-21 19:05:06,021 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:05:06,021 INFO L225 Difference]: With dead ends: 30 [2020-08-21 19:05:06,021 INFO L226 Difference]: Without dead ends: 25 [2020-08-21 19:05:06,022 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-21 19:05:06,023 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-21 19:05:06,027 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-08-21 19:05:06,027 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-21 19:05:06,028 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 29 transitions. [2020-08-21 19:05:06,028 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 29 transitions. Word has length 20 [2020-08-21 19:05:06,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:05:06,028 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 29 transitions. [2020-08-21 19:05:06,028 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 19:05:06,029 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 29 transitions. [2020-08-21 19:05:06,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-21 19:05:06,029 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:05:06,030 INFO L422 BasicCegarLoop]: trace histogram [6, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:05:06,030 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 19:05:06,030 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:05:06,030 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:05:06,030 INFO L82 PathProgramCache]: Analyzing trace with hash 389290560, now seen corresponding path program 7 times [2020-08-21 19:05:06,031 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:05:06,031 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [5655849] [2020-08-21 19:05:06,031 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:05:06,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:06,074 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:05:06,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:06,077 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-21 19:05:06,077 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [5655849] [2020-08-21 19:05:06,078 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:05:06,078 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-21 19:05:06,078 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [293643707] [2020-08-21 19:05:06,078 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 19:05:06,079 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:05:06,079 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 19:05:06,079 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-08-21 19:05:06,079 INFO L87 Difference]: Start difference. First operand 25 states and 29 transitions. Second operand 5 states. [2020-08-21 19:05:06,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:05:06,099 INFO L93 Difference]: Finished difference Result 34 states and 40 transitions. [2020-08-21 19:05:06,100 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 19:05:06,100 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 24 [2020-08-21 19:05:06,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:05:06,101 INFO L225 Difference]: With dead ends: 34 [2020-08-21 19:05:06,101 INFO L226 Difference]: Without dead ends: 29 [2020-08-21 19:05:06,101 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-08-21 19:05:06,102 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-21 19:05:06,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-08-21 19:05:06,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-21 19:05:06,107 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 35 transitions. [2020-08-21 19:05:06,108 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 35 transitions. Word has length 24 [2020-08-21 19:05:06,108 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:05:06,108 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 35 transitions. [2020-08-21 19:05:06,108 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 19:05:06,108 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 35 transitions. [2020-08-21 19:05:06,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-21 19:05:06,109 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:05:06,109 INFO L422 BasicCegarLoop]: trace histogram [6, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:05:06,110 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 19:05:06,110 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:05:06,110 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:05:06,110 INFO L82 PathProgramCache]: Analyzing trace with hash -1279139630, now seen corresponding path program 8 times [2020-08-21 19:05:06,110 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:05:06,111 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [204783101] [2020-08-21 19:05:06,111 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:05:06,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:06,162 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:05:06,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:06,165 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-21 19:05:06,166 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [204783101] [2020-08-21 19:05:06,166 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:05:06,166 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 19:05:06,166 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1528293242] [2020-08-21 19:05:06,167 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 19:05:06,167 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:05:06,167 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 19:05:06,168 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-08-21 19:05:06,168 INFO L87 Difference]: Start difference. First operand 29 states and 35 transitions. Second operand 6 states. [2020-08-21 19:05:06,190 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:05:06,191 INFO L93 Difference]: Finished difference Result 38 states and 46 transitions. [2020-08-21 19:05:06,191 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 19:05:06,191 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 28 [2020-08-21 19:05:06,192 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:05:06,192 INFO L225 Difference]: With dead ends: 38 [2020-08-21 19:05:06,192 INFO L226 Difference]: Without dead ends: 33 [2020-08-21 19:05:06,193 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-08-21 19:05:06,193 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-21 19:05:06,198 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-08-21 19:05:06,198 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-21 19:05:06,199 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 41 transitions. [2020-08-21 19:05:06,199 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 41 transitions. Word has length 28 [2020-08-21 19:05:06,200 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:05:06,200 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 41 transitions. [2020-08-21 19:05:06,200 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 19:05:06,200 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 41 transitions. [2020-08-21 19:05:06,201 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-21 19:05:06,201 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:05:06,201 INFO L422 BasicCegarLoop]: trace histogram [6, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:05:06,201 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 19:05:06,202 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:05:06,202 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:05:06,202 INFO L82 PathProgramCache]: Analyzing trace with hash 805703268, now seen corresponding path program 9 times [2020-08-21 19:05:06,202 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:05:06,203 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1741821012] [2020-08-21 19:05:06,203 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:05:06,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:06,299 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:05:06,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:06,304 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 25 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-21 19:05:06,304 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1741821012] [2020-08-21 19:05:06,304 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:05:06,305 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 19:05:06,305 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [258638393] [2020-08-21 19:05:06,305 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 19:05:06,306 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:05:06,306 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 19:05:06,306 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2020-08-21 19:05:06,306 INFO L87 Difference]: Start difference. First operand 33 states and 41 transitions. Second operand 10 states. [2020-08-21 19:05:06,504 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:05:06,504 INFO L93 Difference]: Finished difference Result 54 states and 70 transitions. [2020-08-21 19:05:06,505 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 19:05:06,505 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 32 [2020-08-21 19:05:06,505 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:05:06,506 INFO L225 Difference]: With dead ends: 54 [2020-08-21 19:05:06,506 INFO L226 Difference]: Without dead ends: 34 [2020-08-21 19:05:06,507 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-08-21 19:05:06,507 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-21 19:05:06,513 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-08-21 19:05:06,513 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-21 19:05:06,514 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 42 transitions. [2020-08-21 19:05:06,514 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 42 transitions. Word has length 32 [2020-08-21 19:05:06,514 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:05:06,514 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 42 transitions. [2020-08-21 19:05:06,514 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 19:05:06,515 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 42 transitions. [2020-08-21 19:05:06,515 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-21 19:05:06,516 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:05:06,516 INFO L422 BasicCegarLoop]: trace histogram [7, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:05:06,516 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 19:05:06,516 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:05:06,516 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:05:06,517 INFO L82 PathProgramCache]: Analyzing trace with hash 1833781516, now seen corresponding path program 10 times [2020-08-21 19:05:06,517 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:05:06,517 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1591942713] [2020-08-21 19:05:06,517 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:05:06,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:06,611 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:05:06,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:06,614 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 28 proven. 28 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-21 19:05:06,615 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1591942713] [2020-08-21 19:05:06,615 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:05:06,615 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 19:05:06,615 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [104742398] [2020-08-21 19:05:06,616 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 19:05:06,616 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:05:06,616 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 19:05:06,616 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=90, Unknown=0, NotChecked=0, Total=110 [2020-08-21 19:05:06,616 INFO L87 Difference]: Start difference. First operand 34 states and 42 transitions. Second operand 11 states. [2020-08-21 19:05:06,825 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:05:06,825 INFO L93 Difference]: Finished difference Result 55 states and 71 transitions. [2020-08-21 19:05:06,825 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 19:05:06,825 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 33 [2020-08-21 19:05:06,826 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:05:06,826 INFO L225 Difference]: With dead ends: 55 [2020-08-21 19:05:06,826 INFO L226 Difference]: Without dead ends: 35 [2020-08-21 19:05:06,827 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=108, Invalid=234, Unknown=0, NotChecked=0, Total=342 [2020-08-21 19:05:06,828 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-21 19:05:06,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-08-21 19:05:06,833 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-21 19:05:06,833 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 43 transitions. [2020-08-21 19:05:06,834 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 43 transitions. Word has length 33 [2020-08-21 19:05:06,834 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:05:06,834 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 43 transitions. [2020-08-21 19:05:06,834 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 19:05:06,834 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 43 transitions. [2020-08-21 19:05:06,835 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-21 19:05:06,835 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:05:06,835 INFO L422 BasicCegarLoop]: trace histogram [8, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:05:06,835 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 19:05:06,836 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:05:06,836 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:05:06,836 INFO L82 PathProgramCache]: Analyzing trace with hash -655531164, now seen corresponding path program 11 times [2020-08-21 19:05:06,836 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:05:06,837 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [491492408] [2020-08-21 19:05:06,837 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:05:06,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:06,957 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:05:06,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:06,961 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 31 proven. 36 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-21 19:05:06,962 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [491492408] [2020-08-21 19:05:06,962 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:05:06,962 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 19:05:06,962 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [298707816] [2020-08-21 19:05:06,963 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 19:05:06,963 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:05:06,963 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 19:05:06,963 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=110, Unknown=0, NotChecked=0, Total=132 [2020-08-21 19:05:06,963 INFO L87 Difference]: Start difference. First operand 35 states and 43 transitions. Second operand 12 states. [2020-08-21 19:05:07,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:05:07,218 INFO L93 Difference]: Finished difference Result 56 states and 72 transitions. [2020-08-21 19:05:07,219 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 19:05:07,219 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 34 [2020-08-21 19:05:07,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:05:07,220 INFO L225 Difference]: With dead ends: 56 [2020-08-21 19:05:07,221 INFO L226 Difference]: Without dead ends: 36 [2020-08-21 19:05:07,222 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=130, Invalid=290, Unknown=0, NotChecked=0, Total=420 [2020-08-21 19:05:07,222 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-21 19:05:07,231 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-08-21 19:05:07,231 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-21 19:05:07,233 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 44 transitions. [2020-08-21 19:05:07,233 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 44 transitions. Word has length 34 [2020-08-21 19:05:07,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:05:07,235 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 44 transitions. [2020-08-21 19:05:07,235 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 19:05:07,235 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 44 transitions. [2020-08-21 19:05:07,236 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-21 19:05:07,236 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:05:07,236 INFO L422 BasicCegarLoop]: trace histogram [9, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:05:07,237 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-21 19:05:07,238 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:05:07,238 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:05:07,238 INFO L82 PathProgramCache]: Analyzing trace with hash -514812916, now seen corresponding path program 12 times [2020-08-21 19:05:07,239 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:05:07,239 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1509073237] [2020-08-21 19:05:07,239 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:05:07,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:07,395 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:05:07,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:07,398 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 34 proven. 45 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-21 19:05:07,399 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1509073237] [2020-08-21 19:05:07,399 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:05:07,399 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 19:05:07,399 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [378234706] [2020-08-21 19:05:07,400 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 19:05:07,401 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:05:07,401 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 19:05:07,401 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=132, Unknown=0, NotChecked=0, Total=156 [2020-08-21 19:05:07,401 INFO L87 Difference]: Start difference. First operand 36 states and 44 transitions. Second operand 13 states. [2020-08-21 19:05:07,807 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:05:07,807 INFO L93 Difference]: Finished difference Result 57 states and 73 transitions. [2020-08-21 19:05:07,807 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 19:05:07,808 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 35 [2020-08-21 19:05:07,808 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:05:07,808 INFO L225 Difference]: With dead ends: 57 [2020-08-21 19:05:07,809 INFO L226 Difference]: Without dead ends: 37 [2020-08-21 19:05:07,809 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=154, Invalid=352, Unknown=0, NotChecked=0, Total=506 [2020-08-21 19:05:07,810 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-21 19:05:07,821 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-08-21 19:05:07,821 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-21 19:05:07,822 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 45 transitions. [2020-08-21 19:05:07,822 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 45 transitions. Word has length 35 [2020-08-21 19:05:07,822 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:05:07,822 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 45 transitions. [2020-08-21 19:05:07,823 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 19:05:07,823 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 45 transitions. [2020-08-21 19:05:07,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-21 19:05:07,823 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:05:07,823 INFO L422 BasicCegarLoop]: trace histogram [10, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:05:07,824 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-21 19:05:07,824 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:05:07,824 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:05:07,824 INFO L82 PathProgramCache]: Analyzing trace with hash -447514524, now seen corresponding path program 13 times [2020-08-21 19:05:07,824 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:05:07,827 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1598410309] [2020-08-21 19:05:07,827 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:05:07,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:07,972 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:05:07,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:07,976 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 37 proven. 55 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-21 19:05:07,977 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1598410309] [2020-08-21 19:05:07,977 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:05:07,977 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-21 19:05:07,977 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1338150170] [2020-08-21 19:05:07,978 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-21 19:05:07,978 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:05:07,978 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-21 19:05:07,978 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=156, Unknown=0, NotChecked=0, Total=182 [2020-08-21 19:05:07,979 INFO L87 Difference]: Start difference. First operand 37 states and 45 transitions. Second operand 14 states. [2020-08-21 19:05:08,356 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:05:08,356 INFO L93 Difference]: Finished difference Result 58 states and 74 transitions. [2020-08-21 19:05:08,356 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-21 19:05:08,356 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 36 [2020-08-21 19:05:08,357 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:05:08,357 INFO L225 Difference]: With dead ends: 58 [2020-08-21 19:05:08,357 INFO L226 Difference]: Without dead ends: 38 [2020-08-21 19:05:08,358 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=180, Invalid=420, Unknown=0, NotChecked=0, Total=600 [2020-08-21 19:05:08,360 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-21 19:05:08,373 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-08-21 19:05:08,374 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-21 19:05:08,374 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 46 transitions. [2020-08-21 19:05:08,374 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 46 transitions. Word has length 36 [2020-08-21 19:05:08,374 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:05:08,377 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 46 transitions. [2020-08-21 19:05:08,378 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-21 19:05:08,378 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 46 transitions. [2020-08-21 19:05:08,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-21 19:05:08,378 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:05:08,379 INFO L422 BasicCegarLoop]: trace histogram [11, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:05:08,379 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-21 19:05:08,379 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:05:08,379 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:05:08,380 INFO L82 PathProgramCache]: Analyzing trace with hash 1638735628, now seen corresponding path program 14 times [2020-08-21 19:05:08,382 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:05:08,382 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1953578370] [2020-08-21 19:05:08,382 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:05:08,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:08,533 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:05:08,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:08,536 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 40 proven. 66 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-21 19:05:08,536 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1953578370] [2020-08-21 19:05:08,537 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:05:08,537 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-21 19:05:08,537 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1133696813] [2020-08-21 19:05:08,538 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-21 19:05:08,538 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:05:08,538 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-21 19:05:08,538 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=182, Unknown=0, NotChecked=0, Total=210 [2020-08-21 19:05:08,538 INFO L87 Difference]: Start difference. First operand 38 states and 46 transitions. Second operand 15 states. [2020-08-21 19:05:08,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:05:08,929 INFO L93 Difference]: Finished difference Result 59 states and 75 transitions. [2020-08-21 19:05:08,929 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-21 19:05:08,930 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 37 [2020-08-21 19:05:08,930 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:05:08,931 INFO L225 Difference]: With dead ends: 59 [2020-08-21 19:05:08,931 INFO L226 Difference]: Without dead ends: 39 [2020-08-21 19:05:08,932 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=208, Invalid=494, Unknown=0, NotChecked=0, Total=702 [2020-08-21 19:05:08,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-21 19:05:08,938 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-21 19:05:08,939 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-21 19:05:08,939 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 47 transitions. [2020-08-21 19:05:08,940 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 47 transitions. Word has length 37 [2020-08-21 19:05:08,940 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:05:08,940 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 47 transitions. [2020-08-21 19:05:08,940 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-21 19:05:08,940 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 47 transitions. [2020-08-21 19:05:08,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-21 19:05:08,941 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:05:08,941 INFO L422 BasicCegarLoop]: trace histogram [12, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:05:08,941 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-21 19:05:08,941 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:05:08,942 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:05:08,942 INFO L82 PathProgramCache]: Analyzing trace with hash 1887980900, now seen corresponding path program 15 times [2020-08-21 19:05:08,942 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:05:08,942 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [644077342] [2020-08-21 19:05:08,942 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:05:08,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:09,124 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:05:09,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:09,128 INFO L134 CoverageAnalysis]: Checked inductivity of 142 backedges. 43 proven. 78 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-21 19:05:09,129 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [644077342] [2020-08-21 19:05:09,129 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:05:09,130 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-21 19:05:09,130 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [428307594] [2020-08-21 19:05:09,133 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-21 19:05:09,133 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:05:09,133 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-21 19:05:09,136 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=210, Unknown=0, NotChecked=0, Total=240 [2020-08-21 19:05:09,136 INFO L87 Difference]: Start difference. First operand 39 states and 47 transitions. Second operand 16 states. [2020-08-21 19:05:09,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:05:09,576 INFO L93 Difference]: Finished difference Result 60 states and 76 transitions. [2020-08-21 19:05:09,576 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-21 19:05:09,577 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 38 [2020-08-21 19:05:09,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:05:09,577 INFO L225 Difference]: With dead ends: 60 [2020-08-21 19:05:09,577 INFO L226 Difference]: Without dead ends: 40 [2020-08-21 19:05:09,578 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=238, Invalid=574, Unknown=0, NotChecked=0, Total=812 [2020-08-21 19:05:09,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-21 19:05:09,584 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-08-21 19:05:09,585 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-21 19:05:09,585 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 48 transitions. [2020-08-21 19:05:09,585 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 48 transitions. Word has length 38 [2020-08-21 19:05:09,586 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:05:09,586 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 48 transitions. [2020-08-21 19:05:09,586 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-21 19:05:09,586 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 48 transitions. [2020-08-21 19:05:09,586 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-21 19:05:09,586 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:05:09,587 INFO L422 BasicCegarLoop]: trace histogram [13, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:05:09,587 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-21 19:05:09,587 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:05:09,587 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:05:09,587 INFO L82 PathProgramCache]: Analyzing trace with hash 1024649740, now seen corresponding path program 16 times [2020-08-21 19:05:09,588 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:05:09,588 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1495274816] [2020-08-21 19:05:09,588 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:05:09,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:09,763 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:05:09,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:09,768 INFO L134 CoverageAnalysis]: Checked inductivity of 158 backedges. 46 proven. 91 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-21 19:05:09,768 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1495274816] [2020-08-21 19:05:09,768 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:05:09,769 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-21 19:05:09,769 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1295469973] [2020-08-21 19:05:09,769 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-21 19:05:09,769 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:05:09,770 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-21 19:05:09,770 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=240, Unknown=0, NotChecked=0, Total=272 [2020-08-21 19:05:09,770 INFO L87 Difference]: Start difference. First operand 40 states and 48 transitions. Second operand 17 states. [2020-08-21 19:05:10,272 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:05:10,272 INFO L93 Difference]: Finished difference Result 61 states and 77 transitions. [2020-08-21 19:05:10,272 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-21 19:05:10,272 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 39 [2020-08-21 19:05:10,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:05:10,273 INFO L225 Difference]: With dead ends: 61 [2020-08-21 19:05:10,273 INFO L226 Difference]: Without dead ends: 41 [2020-08-21 19:05:10,274 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 104 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=270, Invalid=660, Unknown=0, NotChecked=0, Total=930 [2020-08-21 19:05:10,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-21 19:05:10,280 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-21 19:05:10,281 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-21 19:05:10,281 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 49 transitions. [2020-08-21 19:05:10,281 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 49 transitions. Word has length 39 [2020-08-21 19:05:10,282 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:05:10,282 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 49 transitions. [2020-08-21 19:05:10,282 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-21 19:05:10,282 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 49 transitions. [2020-08-21 19:05:10,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-21 19:05:10,283 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:05:10,283 INFO L422 BasicCegarLoop]: trace histogram [14, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:05:10,283 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-21 19:05:10,283 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:05:10,283 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:05:10,284 INFO L82 PathProgramCache]: Analyzing trace with hash 31187556, now seen corresponding path program 17 times [2020-08-21 19:05:10,284 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:05:10,284 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1262510655] [2020-08-21 19:05:10,284 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:05:10,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:10,499 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:05:10,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:10,503 INFO L134 CoverageAnalysis]: Checked inductivity of 175 backedges. 49 proven. 105 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-21 19:05:10,503 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1262510655] [2020-08-21 19:05:10,503 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:05:10,503 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-21 19:05:10,504 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [359644917] [2020-08-21 19:05:10,504 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-21 19:05:10,504 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:05:10,504 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-21 19:05:10,504 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=272, Unknown=0, NotChecked=0, Total=306 [2020-08-21 19:05:10,505 INFO L87 Difference]: Start difference. First operand 41 states and 49 transitions. Second operand 18 states. [2020-08-21 19:05:11,048 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:05:11,048 INFO L93 Difference]: Finished difference Result 62 states and 78 transitions. [2020-08-21 19:05:11,048 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-21 19:05:11,049 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 40 [2020-08-21 19:05:11,049 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:05:11,049 INFO L225 Difference]: With dead ends: 62 [2020-08-21 19:05:11,050 INFO L226 Difference]: Without dead ends: 42 [2020-08-21 19:05:11,050 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 119 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=304, Invalid=752, Unknown=0, NotChecked=0, Total=1056 [2020-08-21 19:05:11,051 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-21 19:05:11,056 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-08-21 19:05:11,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-21 19:05:11,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 50 transitions. [2020-08-21 19:05:11,057 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 50 transitions. Word has length 40 [2020-08-21 19:05:11,057 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:05:11,057 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 50 transitions. [2020-08-21 19:05:11,057 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-21 19:05:11,057 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 50 transitions. [2020-08-21 19:05:11,058 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-21 19:05:11,058 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:05:11,058 INFO L422 BasicCegarLoop]: trace histogram [15, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:05:11,058 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-21 19:05:11,059 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:05:11,059 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:05:11,059 INFO L82 PathProgramCache]: Analyzing trace with hash -701369076, now seen corresponding path program 18 times [2020-08-21 19:05:11,059 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:05:11,059 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1236469257] [2020-08-21 19:05:11,059 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:05:11,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:11,316 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:05:11,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:11,327 INFO L134 CoverageAnalysis]: Checked inductivity of 193 backedges. 52 proven. 120 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-21 19:05:11,328 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1236469257] [2020-08-21 19:05:11,328 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:05:11,328 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-21 19:05:11,328 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1304388926] [2020-08-21 19:05:11,328 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-21 19:05:11,329 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:05:11,329 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-21 19:05:11,329 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=306, Unknown=0, NotChecked=0, Total=342 [2020-08-21 19:05:11,329 INFO L87 Difference]: Start difference. First operand 42 states and 50 transitions. Second operand 19 states. [2020-08-21 19:05:11,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:05:11,942 INFO L93 Difference]: Finished difference Result 63 states and 79 transitions. [2020-08-21 19:05:11,942 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-21 19:05:11,943 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 41 [2020-08-21 19:05:11,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:05:11,944 INFO L225 Difference]: With dead ends: 63 [2020-08-21 19:05:11,944 INFO L226 Difference]: Without dead ends: 43 [2020-08-21 19:05:11,945 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 135 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=340, Invalid=850, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 19:05:11,945 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-21 19:05:11,950 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-21 19:05:11,951 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-21 19:05:11,951 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 51 transitions. [2020-08-21 19:05:11,951 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 51 transitions. Word has length 41 [2020-08-21 19:05:11,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:05:11,952 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 51 transitions. [2020-08-21 19:05:11,952 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-21 19:05:11,952 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 51 transitions. [2020-08-21 19:05:11,952 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-21 19:05:11,952 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:05:11,952 INFO L422 BasicCegarLoop]: trace histogram [16, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:05:11,953 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-21 19:05:11,953 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:05:11,953 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:05:11,953 INFO L82 PathProgramCache]: Analyzing trace with hash -1935788188, now seen corresponding path program 19 times [2020-08-21 19:05:11,953 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:05:11,953 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [562205652] [2020-08-21 19:05:11,953 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:05:11,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:12,225 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:05:12,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:12,230 INFO L134 CoverageAnalysis]: Checked inductivity of 212 backedges. 55 proven. 136 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-21 19:05:12,230 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [562205652] [2020-08-21 19:05:12,232 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:05:12,232 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-21 19:05:12,232 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [787646765] [2020-08-21 19:05:12,233 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-21 19:05:12,233 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:05:12,233 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-21 19:05:12,234 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=342, Unknown=0, NotChecked=0, Total=380 [2020-08-21 19:05:12,234 INFO L87 Difference]: Start difference. First operand 43 states and 51 transitions. Second operand 20 states. [2020-08-21 19:05:12,931 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:05:12,931 INFO L93 Difference]: Finished difference Result 64 states and 80 transitions. [2020-08-21 19:05:12,933 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-21 19:05:12,933 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 42 [2020-08-21 19:05:12,934 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:05:12,934 INFO L225 Difference]: With dead ends: 64 [2020-08-21 19:05:12,934 INFO L226 Difference]: Without dead ends: 44 [2020-08-21 19:05:12,935 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 152 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=378, Invalid=954, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 19:05:12,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-21 19:05:12,940 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-08-21 19:05:12,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-21 19:05:12,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 52 transitions. [2020-08-21 19:05:12,941 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 52 transitions. Word has length 42 [2020-08-21 19:05:12,941 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:05:12,942 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 52 transitions. [2020-08-21 19:05:12,942 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-21 19:05:12,942 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 52 transitions. [2020-08-21 19:05:12,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-21 19:05:12,942 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:05:12,942 INFO L422 BasicCegarLoop]: trace histogram [17, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:05:12,943 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-21 19:05:12,943 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:05:12,943 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:05:12,943 INFO L82 PathProgramCache]: Analyzing trace with hash -1548074996, now seen corresponding path program 20 times [2020-08-21 19:05:12,943 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:05:12,944 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1124720807] [2020-08-21 19:05:12,944 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:05:12,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:13,227 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:05:13,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:13,230 INFO L134 CoverageAnalysis]: Checked inductivity of 232 backedges. 58 proven. 153 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-21 19:05:13,231 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1124720807] [2020-08-21 19:05:13,231 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:05:13,231 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-21 19:05:13,232 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [866685358] [2020-08-21 19:05:13,234 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-21 19:05:13,234 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:05:13,234 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-21 19:05:13,235 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=380, Unknown=0, NotChecked=0, Total=420 [2020-08-21 19:05:13,235 INFO L87 Difference]: Start difference. First operand 44 states and 52 transitions. Second operand 21 states. [2020-08-21 19:05:14,036 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:05:14,036 INFO L93 Difference]: Finished difference Result 65 states and 81 transitions. [2020-08-21 19:05:14,036 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-21 19:05:14,037 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 43 [2020-08-21 19:05:14,037 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:05:14,038 INFO L225 Difference]: With dead ends: 65 [2020-08-21 19:05:14,038 INFO L226 Difference]: Without dead ends: 45 [2020-08-21 19:05:14,039 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 170 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=418, Invalid=1064, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 19:05:14,039 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-21 19:05:14,044 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-08-21 19:05:14,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-21 19:05:14,045 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 53 transitions. [2020-08-21 19:05:14,045 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 53 transitions. Word has length 43 [2020-08-21 19:05:14,046 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:05:14,046 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 53 transitions. [2020-08-21 19:05:14,046 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-21 19:05:14,046 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 53 transitions. [2020-08-21 19:05:14,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-21 19:05:14,046 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:05:14,046 INFO L422 BasicCegarLoop]: trace histogram [18, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:05:14,047 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-21 19:05:14,047 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:05:14,047 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:05:14,047 INFO L82 PathProgramCache]: Analyzing trace with hash 1881099364, now seen corresponding path program 21 times [2020-08-21 19:05:14,047 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:05:14,048 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [132108513] [2020-08-21 19:05:14,048 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:05:14,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:14,323 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:05:14,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:14,327 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 61 proven. 171 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-21 19:05:14,327 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [132108513] [2020-08-21 19:05:14,328 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:05:14,328 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-21 19:05:14,329 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1366290353] [2020-08-21 19:05:14,330 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-21 19:05:14,330 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:05:14,331 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-21 19:05:14,331 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=420, Unknown=0, NotChecked=0, Total=462 [2020-08-21 19:05:14,331 INFO L87 Difference]: Start difference. First operand 45 states and 53 transitions. Second operand 22 states. [2020-08-21 19:05:15,204 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:05:15,205 INFO L93 Difference]: Finished difference Result 66 states and 82 transitions. [2020-08-21 19:05:15,205 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-21 19:05:15,205 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 44 [2020-08-21 19:05:15,206 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:05:15,206 INFO L225 Difference]: With dead ends: 66 [2020-08-21 19:05:15,207 INFO L226 Difference]: Without dead ends: 46 [2020-08-21 19:05:15,208 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 189 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=460, Invalid=1180, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 19:05:15,208 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-21 19:05:15,215 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-08-21 19:05:15,215 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-21 19:05:15,215 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 54 transitions. [2020-08-21 19:05:15,216 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 54 transitions. Word has length 44 [2020-08-21 19:05:15,216 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:05:15,216 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 54 transitions. [2020-08-21 19:05:15,216 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-21 19:05:15,216 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 54 transitions. [2020-08-21 19:05:15,217 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-21 19:05:15,217 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:05:15,217 INFO L422 BasicCegarLoop]: trace histogram [19, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:05:15,217 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-21 19:05:15,217 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:05:15,218 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:05:15,218 INFO L82 PathProgramCache]: Analyzing trace with hash 811322124, now seen corresponding path program 22 times [2020-08-21 19:05:15,218 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:05:15,218 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [581685827] [2020-08-21 19:05:15,218 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:05:15,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:15,532 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:05:15,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:15,536 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 64 proven. 190 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-21 19:05:15,536 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [581685827] [2020-08-21 19:05:15,537 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:05:15,537 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-21 19:05:15,537 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1296409970] [2020-08-21 19:05:15,537 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-21 19:05:15,537 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:05:15,537 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-21 19:05:15,538 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=462, Unknown=0, NotChecked=0, Total=506 [2020-08-21 19:05:15,538 INFO L87 Difference]: Start difference. First operand 46 states and 54 transitions. Second operand 23 states. [2020-08-21 19:05:16,558 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:05:16,558 INFO L93 Difference]: Finished difference Result 67 states and 83 transitions. [2020-08-21 19:05:16,559 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-21 19:05:16,559 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 45 [2020-08-21 19:05:16,559 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:05:16,560 INFO L225 Difference]: With dead ends: 67 [2020-08-21 19:05:16,560 INFO L226 Difference]: Without dead ends: 47 [2020-08-21 19:05:16,561 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 209 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=504, Invalid=1302, Unknown=0, NotChecked=0, Total=1806 [2020-08-21 19:05:16,561 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-21 19:05:16,569 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-08-21 19:05:16,569 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-21 19:05:16,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 55 transitions. [2020-08-21 19:05:16,569 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 55 transitions. Word has length 45 [2020-08-21 19:05:16,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:05:16,570 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 55 transitions. [2020-08-21 19:05:16,570 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-21 19:05:16,570 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 55 transitions. [2020-08-21 19:05:16,571 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-21 19:05:16,571 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:05:16,572 INFO L422 BasicCegarLoop]: trace histogram [20, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:05:16,572 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-21 19:05:16,572 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:05:16,572 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:05:16,572 INFO L82 PathProgramCache]: Analyzing trace with hash 2007966052, now seen corresponding path program 23 times [2020-08-21 19:05:16,572 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:05:16,573 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1804168703] [2020-08-21 19:05:16,573 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:05:16,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:16,952 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:05:16,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:16,956 INFO L134 CoverageAnalysis]: Checked inductivity of 298 backedges. 67 proven. 210 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-21 19:05:16,957 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1804168703] [2020-08-21 19:05:16,957 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:05:16,957 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-21 19:05:16,957 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1532091768] [2020-08-21 19:05:16,957 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-21 19:05:16,957 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:05:16,958 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-21 19:05:16,958 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=506, Unknown=0, NotChecked=0, Total=552 [2020-08-21 19:05:16,958 INFO L87 Difference]: Start difference. First operand 47 states and 55 transitions. Second operand 24 states. [2020-08-21 19:05:18,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:05:18,020 INFO L93 Difference]: Finished difference Result 68 states and 84 transitions. [2020-08-21 19:05:18,022 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-21 19:05:18,022 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 46 [2020-08-21 19:05:18,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:05:18,023 INFO L225 Difference]: With dead ends: 68 [2020-08-21 19:05:18,023 INFO L226 Difference]: Without dead ends: 48 [2020-08-21 19:05:18,024 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 230 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=550, Invalid=1430, Unknown=0, NotChecked=0, Total=1980 [2020-08-21 19:05:18,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-21 19:05:18,031 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-08-21 19:05:18,031 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-21 19:05:18,031 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 56 transitions. [2020-08-21 19:05:18,031 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 56 transitions. Word has length 46 [2020-08-21 19:05:18,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:05:18,032 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 56 transitions. [2020-08-21 19:05:18,032 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-21 19:05:18,032 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 56 transitions. [2020-08-21 19:05:18,032 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-21 19:05:18,033 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:05:18,033 INFO L422 BasicCegarLoop]: trace histogram [21, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:05:18,033 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-21 19:05:18,033 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:05:18,033 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:05:18,033 INFO L82 PathProgramCache]: Analyzing trace with hash 449222156, now seen corresponding path program 24 times [2020-08-21 19:05:18,034 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:05:18,034 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [839147470] [2020-08-21 19:05:18,034 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:05:18,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:18,422 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:05:18,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:18,428 INFO L134 CoverageAnalysis]: Checked inductivity of 322 backedges. 70 proven. 231 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-21 19:05:18,428 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [839147470] [2020-08-21 19:05:18,428 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:05:18,428 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-21 19:05:18,429 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [917890164] [2020-08-21 19:05:18,431 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-21 19:05:18,431 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:05:18,432 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-21 19:05:18,432 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=552, Unknown=0, NotChecked=0, Total=600 [2020-08-21 19:05:18,432 INFO L87 Difference]: Start difference. First operand 48 states and 56 transitions. Second operand 25 states. [2020-08-21 19:05:19,609 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:05:19,611 INFO L93 Difference]: Finished difference Result 69 states and 85 transitions. [2020-08-21 19:05:19,612 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-21 19:05:19,612 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 47 [2020-08-21 19:05:19,612 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:05:19,613 INFO L225 Difference]: With dead ends: 69 [2020-08-21 19:05:19,613 INFO L226 Difference]: Without dead ends: 49 [2020-08-21 19:05:19,614 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 252 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=598, Invalid=1564, Unknown=0, NotChecked=0, Total=2162 [2020-08-21 19:05:19,614 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-21 19:05:19,621 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-21 19:05:19,621 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-21 19:05:19,621 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 57 transitions. [2020-08-21 19:05:19,622 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 57 transitions. Word has length 47 [2020-08-21 19:05:19,622 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:05:19,622 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 57 transitions. [2020-08-21 19:05:19,622 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-21 19:05:19,622 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 57 transitions. [2020-08-21 19:05:19,622 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-21 19:05:19,623 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:05:19,623 INFO L422 BasicCegarLoop]: trace histogram [22, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:05:19,623 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-21 19:05:19,623 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:05:19,623 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:05:19,623 INFO L82 PathProgramCache]: Analyzing trace with hash -627198364, now seen corresponding path program 25 times [2020-08-21 19:05:19,624 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:05:19,624 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2124538312] [2020-08-21 19:05:19,624 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:05:19,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:19,672 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:05:19,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:19,674 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 340 trivial. 0 not checked. [2020-08-21 19:05:19,675 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2124538312] [2020-08-21 19:05:19,675 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 19:05:19,675 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 19:05:19,675 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [717327860] [2020-08-21 19:05:19,675 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 19:05:19,676 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:05:19,676 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 19:05:19,676 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 19:05:19,676 INFO L87 Difference]: Start difference. First operand 49 states and 57 transitions. Second operand 5 states. [2020-08-21 19:05:19,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:05:19,710 INFO L93 Difference]: Finished difference Result 66 states and 82 transitions. [2020-08-21 19:05:19,710 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 19:05:19,711 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 48 [2020-08-21 19:05:19,711 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:05:19,711 INFO L225 Difference]: With dead ends: 66 [2020-08-21 19:05:19,711 INFO L226 Difference]: Without dead ends: 0 [2020-08-21 19:05:19,712 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-21 19:05:19,712 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-08-21 19:05:19,712 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-08-21 19:05:19,712 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-08-21 19:05:19,712 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-08-21 19:05:19,713 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 48 [2020-08-21 19:05:19,713 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:05:19,713 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-08-21 19:05:19,713 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 19:05:19,713 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-08-21 19:05:19,713 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-08-21 19:05:19,713 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-21 19:05:19,716 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-08-21 19:05:19,901 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 156 DAG size of output: 12 [2020-08-21 19:05:19,905 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-08-21 19:05:19,905 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-08-21 19:05:19,906 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-08-21 19:05:19,906 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-08-21 19:05:19,906 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-08-21 19:05:19,906 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-08-21 19:05:19,906 INFO L268 CegarLoopResult]: For program point assume_abort_if_notENTRY(lines 3 5) no Hoare annotation was computed. [2020-08-21 19:05:19,906 INFO L268 CegarLoopResult]: For program point L4(line 4) no Hoare annotation was computed. [2020-08-21 19:05:19,906 INFO L268 CegarLoopResult]: For program point L4-2(lines 3 5) no Hoare annotation was computed. [2020-08-21 19:05:19,906 INFO L268 CegarLoopResult]: For program point assume_abort_if_notEXIT(lines 3 5) no Hoare annotation was computed. [2020-08-21 19:05:19,906 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 13 30) no Hoare annotation was computed. [2020-08-21 19:05:19,906 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 13 30) no Hoare annotation was computed. [2020-08-21 19:05:19,907 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 13 30) the Hoare annotation is: true [2020-08-21 19:05:19,907 INFO L268 CegarLoopResult]: For program point L28(line 28) no Hoare annotation was computed. [2020-08-21 19:05:19,907 INFO L264 CegarLoopResult]: At program point L24-2(lines 24 26) the Hoare annotation is: (= main_~k~0 4) [2020-08-21 19:05:19,907 INFO L264 CegarLoopResult]: At program point L24-3(lines 18 27) the Hoare annotation is: (or (= main_~k~0 4) (and (<= main_~i~0 0) (<= (+ main_~j~0 100) 0))) [2020-08-21 19:05:19,907 INFO L264 CegarLoopResult]: At program point L20-2(lines 20 22) the Hoare annotation is: (or (= main_~k~0 4) (<= main_~i~0 1)) [2020-08-21 19:05:19,907 INFO L268 CegarLoopResult]: For program point L20-3(lines 20 22) no Hoare annotation was computed. [2020-08-21 19:05:19,908 INFO L264 CegarLoopResult]: At program point L18-2(lines 18 27) the Hoare annotation is: (= main_~k~0 4) [2020-08-21 19:05:19,908 INFO L271 CegarLoopResult]: At program point __VERIFIER_assertENTRY(lines 6 11) the Hoare annotation is: true [2020-08-21 19:05:19,908 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertEXIT(lines 6 11) no Hoare annotation was computed. [2020-08-21 19:05:19,908 INFO L268 CegarLoopResult]: For program point L8(line 8) no Hoare annotation was computed. [2020-08-21 19:05:19,908 INFO L268 CegarLoopResult]: For program point L7(lines 7 9) no Hoare annotation was computed. [2020-08-21 19:05:19,908 INFO L268 CegarLoopResult]: For program point L7-2(lines 6 11) no Hoare annotation was computed. [2020-08-21 19:05:19,909 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 8) no Hoare annotation was computed. [2020-08-21 19:05:19,926 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.08 07:05:19 BoogieIcfgContainer [2020-08-21 19:05:19,926 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-21 19:05:19,928 INFO L168 Benchmark]: Toolchain (without parser) took 16192.83 ms. Allocated memory was 140.5 MB in the beginning and 346.0 MB in the end (delta: 205.5 MB). Free memory was 104.2 MB in the beginning and 118.0 MB in the end (delta: -13.8 MB). Peak memory consumption was 191.7 MB. Max. memory is 7.1 GB. [2020-08-21 19:05:19,929 INFO L168 Benchmark]: CDTParser took 0.25 ms. Allocated memory is still 140.5 MB. Free memory was 122.0 MB in the beginning and 121.6 MB in the end (delta: 419.8 kB). Peak memory consumption was 419.8 kB. Max. memory is 7.1 GB. [2020-08-21 19:05:19,929 INFO L168 Benchmark]: CACSL2BoogieTranslator took 220.31 ms. Allocated memory is still 140.5 MB. Free memory was 103.8 MB in the beginning and 93.9 MB in the end (delta: 9.9 MB). Peak memory consumption was 9.9 MB. Max. memory is 7.1 GB. [2020-08-21 19:05:19,930 INFO L168 Benchmark]: Boogie Preprocessor took 111.45 ms. Allocated memory was 140.5 MB in the beginning and 202.9 MB in the end (delta: 62.4 MB). Free memory was 93.9 MB in the beginning and 181.7 MB in the end (delta: -87.8 MB). Peak memory consumption was 13.4 MB. Max. memory is 7.1 GB. [2020-08-21 19:05:19,930 INFO L168 Benchmark]: RCFGBuilder took 251.98 ms. Allocated memory is still 202.9 MB. Free memory was 181.7 MB in the beginning and 169.5 MB in the end (delta: 12.2 MB). Peak memory consumption was 12.2 MB. Max. memory is 7.1 GB. [2020-08-21 19:05:19,931 INFO L168 Benchmark]: TraceAbstraction took 15604.63 ms. Allocated memory was 202.9 MB in the beginning and 346.0 MB in the end (delta: 143.1 MB). Free memory was 168.6 MB in the beginning and 118.0 MB in the end (delta: 50.6 MB). Peak memory consumption was 193.7 MB. Max. memory is 7.1 GB. [2020-08-21 19:05:19,933 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.25 ms. Allocated memory is still 140.5 MB. Free memory was 122.0 MB in the beginning and 121.6 MB in the end (delta: 419.8 kB). Peak memory consumption was 419.8 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 220.31 ms. Allocated memory is still 140.5 MB. Free memory was 103.8 MB in the beginning and 93.9 MB in the end (delta: 9.9 MB). Peak memory consumption was 9.9 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 111.45 ms. Allocated memory was 140.5 MB in the beginning and 202.9 MB in the end (delta: 62.4 MB). Free memory was 93.9 MB in the beginning and 181.7 MB in the end (delta: -87.8 MB). Peak memory consumption was 13.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 251.98 ms. Allocated memory is still 202.9 MB. Free memory was 181.7 MB in the beginning and 169.5 MB in the end (delta: 12.2 MB). Peak memory consumption was 12.2 MB. Max. memory is 7.1 GB. * TraceAbstraction took 15604.63 ms. Allocated memory was 202.9 MB in the beginning and 346.0 MB in the end (delta: 143.1 MB). Free memory was 168.6 MB in the beginning and 118.0 MB in the end (delta: 50.6 MB). Peak memory consumption was 193.7 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 8]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 24]: Loop Invariant Derived loop invariant: k == 4 - InvariantResult [Line: 20]: Loop Invariant Derived loop invariant: k == 4 || i <= 1 - InvariantResult [Line: 18]: Loop Invariant Derived loop invariant: k == 4 || (i <= 0 && j + 100 <= 0) - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 25 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 15.3s, OverallIterations: 28, TraceHistogramMax: 22, AutomataDifference: 10.4s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.1s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 404 SDtfs, 15 SDslu, 3185 SDs, 0 SdLazy, 1131 SolverSat, 487 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 652 GetRequests, 112 SyntacticMatches, 0 SemanticMatches, 540 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2002 ImplicationChecksByTransitivity, 11.7s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=49occurred in iteration=27, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.2s AutomataMinimizationTime, 28 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 9 LocationsWithAnnotation, 37 PreInvPairs, 73 NumberOfFragments, 31 HoareAnnotationTreeSize, 37 FomulaSimplifications, 3216 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 9 FomulaSimplificationsInter, 271 FormulaSimplificationTreeSizeReductionInter, 0.1s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 3.9s InterpolantComputationTime, 871 NumberOfCodeBlocks, 871 NumberOfCodeBlocksAsserted, 28 NumberOfCheckSat, 843 ConstructedInterpolants, 0 QuantifiedInterpolants, 100903 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 28 InterpolantComputations, 4 PerfectInterpolantSequences, 1512/3323 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...