/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 false -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-lit/afnp2014.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-89f541c [2020-08-27 21:59:22,279 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-27 21:59:22,284 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-27 21:59:22,327 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-27 21:59:22,327 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-27 21:59:22,336 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-27 21:59:22,340 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-27 21:59:22,344 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-27 21:59:22,348 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-27 21:59:22,351 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-27 21:59:22,352 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-27 21:59:22,353 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-27 21:59:22,354 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-27 21:59:22,357 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-27 21:59:22,360 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-27 21:59:22,362 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-27 21:59:22,363 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-27 21:59:22,366 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-27 21:59:22,367 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-27 21:59:22,378 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-27 21:59:22,380 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-27 21:59:22,381 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-27 21:59:22,382 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-27 21:59:22,383 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-27 21:59:22,398 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-27 21:59:22,398 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-27 21:59:22,398 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-27 21:59:22,399 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-27 21:59:22,400 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-27 21:59:22,405 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-27 21:59:22,405 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-27 21:59:22,409 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-27 21:59:22,410 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-27 21:59:22,411 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-27 21:59:22,412 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-27 21:59:22,412 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-27 21:59:22,413 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-27 21:59:22,413 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-27 21:59:22,413 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-27 21:59:22,414 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-27 21:59:22,418 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-27 21:59:22,419 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 [2020-08-27 21:59:22,467 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-27 21:59:22,468 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-27 21:59:22,470 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-27 21:59:22,470 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-27 21:59:22,470 INFO L138 SettingsManager]: * Use SBE=true [2020-08-27 21:59:22,470 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-27 21:59:22,471 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-27 21:59:22,472 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-27 21:59:22,472 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-27 21:59:22,472 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-27 21:59:22,473 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-27 21:59:22,473 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-27 21:59:22,474 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-27 21:59:22,474 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-27 21:59:22,474 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-27 21:59:22,475 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-27 21:59:22,475 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-27 21:59:22,475 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-27 21:59:22,475 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-27 21:59:22,476 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-27 21:59:22,476 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-27 21:59:22,476 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-27 21:59:22,476 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-27 21:59:22,477 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-27 21:59:22,477 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-27 21:59:22,477 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-27 21:59:22,477 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-27 21:59:22,477 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-27 21:59:22,478 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-27 21:59:22,478 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 -> false [2020-08-27 21:59:22,920 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-27 21:59:22,940 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-27 21:59:22,943 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-27 21:59:22,946 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-27 21:59:22,947 INFO L275 PluginConnector]: CDTParser initialized [2020-08-27 21:59:22,948 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/afnp2014.i [2020-08-27 21:59:23,032 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/1d021f620/a304391a9258472d94e17be4b2d93a2d/FLAGed7bba855 [2020-08-27 21:59:23,562 INFO L306 CDTParser]: Found 1 translation units. [2020-08-27 21:59:23,563 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-lit/afnp2014.i [2020-08-27 21:59:23,570 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/1d021f620/a304391a9258472d94e17be4b2d93a2d/FLAGed7bba855 [2020-08-27 21:59:23,935 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/1d021f620/a304391a9258472d94e17be4b2d93a2d [2020-08-27 21:59:23,948 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-27 21:59:23,950 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-27 21:59:23,951 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-27 21:59:23,952 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-27 21:59:23,956 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-27 21:59:23,957 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.08 09:59:23" (1/1) ... [2020-08-27 21:59:23,962 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2de25899 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 09:59:23, skipping insertion in model container [2020-08-27 21:59:23,962 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.08 09:59:23" (1/1) ... [2020-08-27 21:59:23,971 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-27 21:59:23,996 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-27 21:59:24,216 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-27 21:59:24,221 INFO L203 MainTranslator]: Completed pre-run [2020-08-27 21:59:24,238 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-27 21:59:24,252 INFO L208 MainTranslator]: Completed translation [2020-08-27 21:59:24,253 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 09:59:24 WrapperNode [2020-08-27 21:59:24,253 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-27 21:59:24,254 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-27 21:59:24,254 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-27 21:59:24,255 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-27 21:59:24,269 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 09:59:24" (1/1) ... [2020-08-27 21:59:24,269 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 09:59:24" (1/1) ... [2020-08-27 21:59:24,275 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 09:59:24" (1/1) ... [2020-08-27 21:59:24,275 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 09:59:24" (1/1) ... [2020-08-27 21:59:24,280 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 09:59:24" (1/1) ... [2020-08-27 21:59:24,287 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 09:59:24" (1/1) ... [2020-08-27 21:59:24,288 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 09:59:24" (1/1) ... [2020-08-27 21:59:24,377 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-27 21:59:24,378 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-27 21:59:24,378 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-27 21:59:24,378 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-27 21:59:24,379 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 09:59:24" (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 [2020-08-27 21:59:24,458 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-27 21:59:24,458 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-27 21:59:24,458 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-27 21:59:24,458 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-27 21:59:24,459 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-27 21:59:24,459 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-27 21:59:24,459 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-27 21:59:24,460 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-27 21:59:24,460 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-27 21:59:24,461 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-27 21:59:24,461 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-27 21:59:24,461 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-27 21:59:24,461 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-27 21:59:24,680 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-27 21:59:24,680 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-27 21:59:24,684 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.08 09:59:24 BoogieIcfgContainer [2020-08-27 21:59:24,685 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-27 21:59:24,686 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-27 21:59:24,686 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-27 21:59:24,690 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-27 21:59:24,691 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 27.08 09:59:23" (1/3) ... [2020-08-27 21:59:24,692 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@50a1b8a2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.08 09:59:24, skipping insertion in model container [2020-08-27 21:59:24,692 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 09:59:24" (2/3) ... [2020-08-27 21:59:24,693 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@50a1b8a2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.08 09:59:24, skipping insertion in model container [2020-08-27 21:59:24,693 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.08 09:59:24" (3/3) ... [2020-08-27 21:59:24,695 INFO L109 eAbstractionObserver]: Analyzing ICFG afnp2014.i [2020-08-27 21:59:24,707 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-27 21:59:24,717 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-27 21:59:24,739 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-27 21:59:24,767 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-27 21:59:24,767 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-27 21:59:24,768 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-27 21:59:24,768 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-27 21:59:24,768 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-27 21:59:24,768 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-27 21:59:24,768 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-27 21:59:24,768 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-27 21:59:24,789 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-08-27 21:59:24,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-27 21:59:24,796 INFO L414 BasicCegarLoop]: Found error trace [2020-08-27 21:59:24,797 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-27 21:59:24,797 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-27 21:59:24,804 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-27 21:59:24,805 INFO L82 PathProgramCache]: Analyzing trace with hash -1915647303, now seen corresponding path program 1 times [2020-08-27 21:59:24,814 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-27 21:59:24,815 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [843495784] [2020-08-27 21:59:24,815 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-27 21:59:24,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:24,934 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-27 21:59:24,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:24,941 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-27 21:59:24,942 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [843495784] [2020-08-27 21:59:24,945 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-27 21:59:24,945 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-08-27 21:59:24,946 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1012602363] [2020-08-27 21:59:24,951 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-08-27 21:59:24,951 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-27 21:59:24,966 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-08-27 21:59:24,967 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-27 21:59:24,969 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 2 states. [2020-08-27 21:59:24,993 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-27 21:59:24,994 INFO L93 Difference]: Finished difference Result 32 states and 36 transitions. [2020-08-27 21:59:24,994 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-08-27 21:59:24,995 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2020-08-27 21:59:24,996 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-27 21:59:25,004 INFO L225 Difference]: With dead ends: 32 [2020-08-27 21:59:25,005 INFO L226 Difference]: Without dead ends: 13 [2020-08-27 21:59:25,009 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 [2020-08-27 21:59:25,028 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-08-27 21:59:25,047 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-08-27 21:59:25,049 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-08-27 21:59:25,050 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2020-08-27 21:59:25,052 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 10 [2020-08-27 21:59:25,053 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-27 21:59:25,053 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2020-08-27 21:59:25,053 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-08-27 21:59:25,053 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2020-08-27 21:59:25,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-27 21:59:25,054 INFO L414 BasicCegarLoop]: Found error trace [2020-08-27 21:59:25,054 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-27 21:59:25,055 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-27 21:59:25,055 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-27 21:59:25,055 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-27 21:59:25,056 INFO L82 PathProgramCache]: Analyzing trace with hash 2084433522, now seen corresponding path program 1 times [2020-08-27 21:59:25,056 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-27 21:59:25,056 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [174821941] [2020-08-27 21:59:25,057 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-27 21:59:25,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:25,244 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-27 21:59:25,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:25,250 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-27 21:59:25,251 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [174821941] [2020-08-27 21:59:25,252 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-27 21:59:25,252 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-27 21:59:25,253 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [911791737] [2020-08-27 21:59:25,255 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-27 21:59:25,256 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-27 21:59:25,256 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-27 21:59:25,257 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-27 21:59:25,257 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 5 states. [2020-08-27 21:59:25,353 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-27 21:59:25,354 INFO L93 Difference]: Finished difference Result 21 states and 23 transitions. [2020-08-27 21:59:25,354 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-27 21:59:25,355 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2020-08-27 21:59:25,355 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-27 21:59:25,356 INFO L225 Difference]: With dead ends: 21 [2020-08-27 21:59:25,356 INFO L226 Difference]: Without dead ends: 16 [2020-08-27 21:59:25,358 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-27 21:59:25,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-27 21:59:25,362 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-27 21:59:25,363 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-27 21:59:25,364 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-08-27 21:59:25,364 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 12 [2020-08-27 21:59:25,364 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-27 21:59:25,365 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-08-27 21:59:25,365 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-27 21:59:25,365 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-08-27 21:59:25,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-27 21:59:25,366 INFO L414 BasicCegarLoop]: Found error trace [2020-08-27 21:59:25,366 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-27 21:59:25,366 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-27 21:59:25,367 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-27 21:59:25,367 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-27 21:59:25,367 INFO L82 PathProgramCache]: Analyzing trace with hash 249504553, now seen corresponding path program 1 times [2020-08-27 21:59:25,368 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-27 21:59:25,368 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1382636265] [2020-08-27 21:59:25,368 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-27 21:59:25,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:25,457 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-27 21:59:25,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:25,463 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-27 21:59:25,464 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1382636265] [2020-08-27 21:59:25,464 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-27 21:59:25,465 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-27 21:59:25,465 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1939081646] [2020-08-27 21:59:25,466 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-27 21:59:25,466 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-27 21:59:25,466 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-27 21:59:25,467 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-08-27 21:59:25,467 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 6 states. [2020-08-27 21:59:25,534 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-27 21:59:25,534 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2020-08-27 21:59:25,534 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-27 21:59:25,535 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 15 [2020-08-27 21:59:25,535 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-27 21:59:25,536 INFO L225 Difference]: With dead ends: 24 [2020-08-27 21:59:25,536 INFO L226 Difference]: Without dead ends: 19 [2020-08-27 21:59:25,537 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-08-27 21:59:25,538 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-08-27 21:59:25,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-08-27 21:59:25,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-27 21:59:25,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 22 transitions. [2020-08-27 21:59:25,543 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 22 transitions. Word has length 15 [2020-08-27 21:59:25,544 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-27 21:59:25,544 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 22 transitions. [2020-08-27 21:59:25,544 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-27 21:59:25,544 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 22 transitions. [2020-08-27 21:59:25,545 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-27 21:59:25,545 INFO L414 BasicCegarLoop]: Found error trace [2020-08-27 21:59:25,545 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-27 21:59:25,546 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-27 21:59:25,546 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-27 21:59:25,546 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-27 21:59:25,547 INFO L82 PathProgramCache]: Analyzing trace with hash -2070634734, now seen corresponding path program 2 times [2020-08-27 21:59:25,547 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-27 21:59:25,547 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [676483849] [2020-08-27 21:59:25,548 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-27 21:59:25,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:25,708 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-27 21:59:25,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:25,712 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-27 21:59:25,713 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [676483849] [2020-08-27 21:59:25,713 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-27 21:59:25,713 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-27 21:59:25,714 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [744068001] [2020-08-27 21:59:25,715 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-27 21:59:25,715 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-27 21:59:25,715 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-27 21:59:25,716 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-08-27 21:59:25,716 INFO L87 Difference]: Start difference. First operand 19 states and 22 transitions. Second operand 7 states. [2020-08-27 21:59:25,801 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-27 21:59:25,801 INFO L93 Difference]: Finished difference Result 27 states and 31 transitions. [2020-08-27 21:59:25,802 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-27 21:59:25,802 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 18 [2020-08-27 21:59:25,803 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-27 21:59:25,803 INFO L225 Difference]: With dead ends: 27 [2020-08-27 21:59:25,803 INFO L226 Difference]: Without dead ends: 22 [2020-08-27 21:59:25,804 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2020-08-27 21:59:25,805 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-27 21:59:25,809 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-08-27 21:59:25,809 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-27 21:59:25,810 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 26 transitions. [2020-08-27 21:59:25,811 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 26 transitions. Word has length 18 [2020-08-27 21:59:25,811 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-27 21:59:25,811 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 26 transitions. [2020-08-27 21:59:25,811 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-27 21:59:25,811 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 26 transitions. [2020-08-27 21:59:25,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-27 21:59:25,812 INFO L414 BasicCegarLoop]: Found error trace [2020-08-27 21:59:25,812 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-27 21:59:25,813 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-27 21:59:25,813 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-27 21:59:25,813 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-27 21:59:25,814 INFO L82 PathProgramCache]: Analyzing trace with hash 1863528073, now seen corresponding path program 3 times [2020-08-27 21:59:25,814 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-27 21:59:25,814 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1256254777] [2020-08-27 21:59:25,815 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-27 21:59:25,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:25,943 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-27 21:59:25,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:25,956 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-27 21:59:25,957 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1256254777] [2020-08-27 21:59:25,957 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-27 21:59:25,957 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-27 21:59:25,958 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [854975238] [2020-08-27 21:59:25,960 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-27 21:59:25,961 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-27 21:59:25,961 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-27 21:59:25,961 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2020-08-27 21:59:25,962 INFO L87 Difference]: Start difference. First operand 22 states and 26 transitions. Second operand 8 states. [2020-08-27 21:59:26,090 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-27 21:59:26,091 INFO L93 Difference]: Finished difference Result 30 states and 35 transitions. [2020-08-27 21:59:26,091 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-27 21:59:26,091 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 21 [2020-08-27 21:59:26,092 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-27 21:59:26,093 INFO L225 Difference]: With dead ends: 30 [2020-08-27 21:59:26,093 INFO L226 Difference]: Without dead ends: 25 [2020-08-27 21:59:26,094 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2020-08-27 21:59:26,094 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-27 21:59:26,098 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-08-27 21:59:26,099 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-27 21:59:26,100 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 30 transitions. [2020-08-27 21:59:26,100 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 30 transitions. Word has length 21 [2020-08-27 21:59:26,100 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-27 21:59:26,101 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 30 transitions. [2020-08-27 21:59:26,101 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-27 21:59:26,101 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 30 transitions. [2020-08-27 21:59:26,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-27 21:59:26,102 INFO L414 BasicCegarLoop]: Found error trace [2020-08-27 21:59:26,102 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-27 21:59:26,102 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-27 21:59:26,103 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-27 21:59:26,103 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-27 21:59:26,103 INFO L82 PathProgramCache]: Analyzing trace with hash -854829134, now seen corresponding path program 4 times [2020-08-27 21:59:26,103 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-27 21:59:26,104 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [640156850] [2020-08-27 21:59:26,104 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-27 21:59:26,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:26,236 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-27 21:59:26,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:26,240 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-27 21:59:26,241 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [640156850] [2020-08-27 21:59:26,241 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-27 21:59:26,241 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-27 21:59:26,242 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [902851445] [2020-08-27 21:59:26,242 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-27 21:59:26,243 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-27 21:59:26,243 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-27 21:59:26,243 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-08-27 21:59:26,243 INFO L87 Difference]: Start difference. First operand 25 states and 30 transitions. Second operand 9 states. [2020-08-27 21:59:26,332 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-27 21:59:26,333 INFO L93 Difference]: Finished difference Result 33 states and 39 transitions. [2020-08-27 21:59:26,333 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-27 21:59:26,334 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 24 [2020-08-27 21:59:26,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-27 21:59:26,335 INFO L225 Difference]: With dead ends: 33 [2020-08-27 21:59:26,335 INFO L226 Difference]: Without dead ends: 28 [2020-08-27 21:59:26,335 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2020-08-27 21:59:26,336 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-27 21:59:26,340 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-08-27 21:59:26,341 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-27 21:59:26,342 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 34 transitions. [2020-08-27 21:59:26,342 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 34 transitions. Word has length 24 [2020-08-27 21:59:26,342 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-27 21:59:26,343 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 34 transitions. [2020-08-27 21:59:26,343 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-27 21:59:26,343 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 34 transitions. [2020-08-27 21:59:26,344 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-27 21:59:26,344 INFO L414 BasicCegarLoop]: Found error trace [2020-08-27 21:59:26,344 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-27 21:59:26,344 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-27 21:59:26,345 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-27 21:59:26,345 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-27 21:59:26,345 INFO L82 PathProgramCache]: Analyzing trace with hash -1826016791, now seen corresponding path program 5 times [2020-08-27 21:59:26,345 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-27 21:59:26,346 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [968207424] [2020-08-27 21:59:26,346 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-27 21:59:26,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:26,533 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-27 21:59:26,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:26,538 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-27 21:59:26,540 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [968207424] [2020-08-27 21:59:26,540 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-27 21:59:26,540 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-27 21:59:26,541 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [168858427] [2020-08-27 21:59:26,541 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-27 21:59:26,541 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-27 21:59:26,542 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-27 21:59:26,544 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2020-08-27 21:59:26,544 INFO L87 Difference]: Start difference. First operand 28 states and 34 transitions. Second operand 10 states. [2020-08-27 21:59:26,653 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-27 21:59:26,653 INFO L93 Difference]: Finished difference Result 36 states and 43 transitions. [2020-08-27 21:59:26,654 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-27 21:59:26,654 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-08-27 21:59:26,655 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-27 21:59:26,655 INFO L225 Difference]: With dead ends: 36 [2020-08-27 21:59:26,655 INFO L226 Difference]: Without dead ends: 31 [2020-08-27 21:59:26,656 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=89, Unknown=0, NotChecked=0, Total=110 [2020-08-27 21:59:26,657 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-27 21:59:26,661 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-08-27 21:59:26,662 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-27 21:59:26,663 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 38 transitions. [2020-08-27 21:59:26,663 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 38 transitions. Word has length 27 [2020-08-27 21:59:26,663 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-27 21:59:26,663 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 38 transitions. [2020-08-27 21:59:26,663 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-27 21:59:26,664 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 38 transitions. [2020-08-27 21:59:26,664 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-27 21:59:26,665 INFO L414 BasicCegarLoop]: Found error trace [2020-08-27 21:59:26,665 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-27 21:59:26,665 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-27 21:59:26,665 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-27 21:59:26,666 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-27 21:59:26,666 INFO L82 PathProgramCache]: Analyzing trace with hash 717166674, now seen corresponding path program 6 times [2020-08-27 21:59:26,666 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-27 21:59:26,666 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [736870482] [2020-08-27 21:59:26,667 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-27 21:59:26,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:26,799 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-27 21:59:26,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:26,804 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 63 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-27 21:59:26,804 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [736870482] [2020-08-27 21:59:26,804 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-27 21:59:26,804 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-27 21:59:26,805 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [416158001] [2020-08-27 21:59:26,805 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-27 21:59:26,805 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-27 21:59:26,806 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-27 21:59:26,806 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2020-08-27 21:59:26,806 INFO L87 Difference]: Start difference. First operand 31 states and 38 transitions. Second operand 11 states. [2020-08-27 21:59:26,933 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-27 21:59:26,933 INFO L93 Difference]: Finished difference Result 39 states and 47 transitions. [2020-08-27 21:59:26,934 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-27 21:59:26,934 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 30 [2020-08-27 21:59:26,935 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-27 21:59:26,935 INFO L225 Difference]: With dead ends: 39 [2020-08-27 21:59:26,935 INFO L226 Difference]: Without dead ends: 34 [2020-08-27 21:59:26,936 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=109, Unknown=0, NotChecked=0, Total=132 [2020-08-27 21:59:26,937 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-27 21:59:26,942 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-08-27 21:59:26,942 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-27 21:59:26,943 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 42 transitions. [2020-08-27 21:59:26,943 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 42 transitions. Word has length 30 [2020-08-27 21:59:26,944 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-27 21:59:26,944 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 42 transitions. [2020-08-27 21:59:26,944 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-27 21:59:26,944 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 42 transitions. [2020-08-27 21:59:26,945 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-27 21:59:26,945 INFO L414 BasicCegarLoop]: Found error trace [2020-08-27 21:59:26,945 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-27 21:59:26,946 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-27 21:59:26,946 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-27 21:59:26,946 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-27 21:59:26,946 INFO L82 PathProgramCache]: Analyzing trace with hash 1472671049, now seen corresponding path program 7 times [2020-08-27 21:59:26,947 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-27 21:59:26,947 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [376583194] [2020-08-27 21:59:26,947 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-27 21:59:26,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:27,109 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-27 21:59:27,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:27,115 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-27 21:59:27,115 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [376583194] [2020-08-27 21:59:27,116 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-27 21:59:27,116 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-27 21:59:27,116 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [964482927] [2020-08-27 21:59:27,117 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-27 21:59:27,117 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-27 21:59:27,117 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-27 21:59:27,118 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2020-08-27 21:59:27,118 INFO L87 Difference]: Start difference. First operand 34 states and 42 transitions. Second operand 12 states. [2020-08-27 21:59:27,282 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-27 21:59:27,283 INFO L93 Difference]: Finished difference Result 42 states and 51 transitions. [2020-08-27 21:59:27,283 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-27 21:59:27,283 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 33 [2020-08-27 21:59:27,284 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-27 21:59:27,284 INFO L225 Difference]: With dead ends: 42 [2020-08-27 21:59:27,285 INFO L226 Difference]: Without dead ends: 37 [2020-08-27 21:59:27,285 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=131, Unknown=0, NotChecked=0, Total=156 [2020-08-27 21:59:27,286 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-27 21:59:27,290 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-08-27 21:59:27,290 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-27 21:59:27,291 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 46 transitions. [2020-08-27 21:59:27,291 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 46 transitions. Word has length 33 [2020-08-27 21:59:27,292 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-27 21:59:27,292 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 46 transitions. [2020-08-27 21:59:27,292 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-27 21:59:27,292 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 46 transitions. [2020-08-27 21:59:27,293 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-27 21:59:27,293 INFO L414 BasicCegarLoop]: Found error trace [2020-08-27 21:59:27,294 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-27 21:59:27,294 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-27 21:59:27,294 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-27 21:59:27,294 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-27 21:59:27,294 INFO L82 PathProgramCache]: Analyzing trace with hash -1220091662, now seen corresponding path program 8 times [2020-08-27 21:59:27,295 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-27 21:59:27,295 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1312305451] [2020-08-27 21:59:27,295 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-27 21:59:27,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:27,456 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-27 21:59:27,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:27,462 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 0 proven. 108 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-27 21:59:27,462 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1312305451] [2020-08-27 21:59:27,463 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-27 21:59:27,463 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-27 21:59:27,463 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1821783136] [2020-08-27 21:59:27,464 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-27 21:59:27,464 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-27 21:59:27,464 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-27 21:59:27,464 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2020-08-27 21:59:27,465 INFO L87 Difference]: Start difference. First operand 37 states and 46 transitions. Second operand 13 states. [2020-08-27 21:59:27,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-27 21:59:27,675 INFO L93 Difference]: Finished difference Result 45 states and 55 transitions. [2020-08-27 21:59:27,675 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-27 21:59:27,676 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 36 [2020-08-27 21:59:27,676 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-27 21:59:27,677 INFO L225 Difference]: With dead ends: 45 [2020-08-27 21:59:27,678 INFO L226 Difference]: Without dead ends: 40 [2020-08-27 21:59:27,678 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=155, Unknown=0, NotChecked=0, Total=182 [2020-08-27 21:59:27,681 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-27 21:59:27,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-08-27 21:59:27,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-27 21:59:27,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 50 transitions. [2020-08-27 21:59:27,692 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 50 transitions. Word has length 36 [2020-08-27 21:59:27,693 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-27 21:59:27,693 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 50 transitions. [2020-08-27 21:59:27,693 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-27 21:59:27,693 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 50 transitions. [2020-08-27 21:59:27,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-27 21:59:27,698 INFO L414 BasicCegarLoop]: Found error trace [2020-08-27 21:59:27,701 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-27 21:59:27,702 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-27 21:59:27,702 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-27 21:59:27,702 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-27 21:59:27,702 INFO L82 PathProgramCache]: Analyzing trace with hash 85139625, now seen corresponding path program 9 times [2020-08-27 21:59:27,703 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-27 21:59:27,703 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1757976994] [2020-08-27 21:59:27,703 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-27 21:59:27,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:27,880 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-27 21:59:27,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:27,885 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 0 proven. 135 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-27 21:59:27,885 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1757976994] [2020-08-27 21:59:27,886 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-27 21:59:27,886 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-27 21:59:27,886 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [545129197] [2020-08-27 21:59:27,887 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-27 21:59:27,887 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-27 21:59:27,887 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-27 21:59:27,887 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=157, Unknown=0, NotChecked=0, Total=182 [2020-08-27 21:59:27,888 INFO L87 Difference]: Start difference. First operand 40 states and 50 transitions. Second operand 14 states. [2020-08-27 21:59:28,115 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-27 21:59:28,115 INFO L93 Difference]: Finished difference Result 48 states and 59 transitions. [2020-08-27 21:59:28,116 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-27 21:59:28,116 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 39 [2020-08-27 21:59:28,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-27 21:59:28,117 INFO L225 Difference]: With dead ends: 48 [2020-08-27 21:59:28,117 INFO L226 Difference]: Without dead ends: 43 [2020-08-27 21:59:28,120 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=181, Unknown=0, NotChecked=0, Total=210 [2020-08-27 21:59:28,120 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-27 21:59:28,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-27 21:59:28,132 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-27 21:59:28,135 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 54 transitions. [2020-08-27 21:59:28,135 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 54 transitions. Word has length 39 [2020-08-27 21:59:28,136 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-27 21:59:28,136 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 54 transitions. [2020-08-27 21:59:28,136 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-27 21:59:28,136 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 54 transitions. [2020-08-27 21:59:28,137 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-27 21:59:28,137 INFO L414 BasicCegarLoop]: Found error trace [2020-08-27 21:59:28,137 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-27 21:59:28,138 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-27 21:59:28,139 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-27 21:59:28,139 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-27 21:59:28,139 INFO L82 PathProgramCache]: Analyzing trace with hash 1891479954, now seen corresponding path program 10 times [2020-08-27 21:59:28,140 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-27 21:59:28,140 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1117184096] [2020-08-27 21:59:28,140 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-27 21:59:28,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:28,383 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-27 21:59:28,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:28,389 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 0 proven. 165 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-27 21:59:28,389 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1117184096] [2020-08-27 21:59:28,390 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-27 21:59:28,390 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-27 21:59:28,390 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1527738819] [2020-08-27 21:59:28,391 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-27 21:59:28,391 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-27 21:59:28,392 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-27 21:59:28,392 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2020-08-27 21:59:28,392 INFO L87 Difference]: Start difference. First operand 43 states and 54 transitions. Second operand 15 states. [2020-08-27 21:59:28,667 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-27 21:59:28,668 INFO L93 Difference]: Finished difference Result 51 states and 63 transitions. [2020-08-27 21:59:28,668 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-27 21:59:28,668 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 42 [2020-08-27 21:59:28,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-27 21:59:28,669 INFO L225 Difference]: With dead ends: 51 [2020-08-27 21:59:28,669 INFO L226 Difference]: Without dead ends: 46 [2020-08-27 21:59:28,670 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=209, Unknown=0, NotChecked=0, Total=240 [2020-08-27 21:59:28,670 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-27 21:59:28,680 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-08-27 21:59:28,680 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-27 21:59:28,681 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 58 transitions. [2020-08-27 21:59:28,682 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 58 transitions. Word has length 42 [2020-08-27 21:59:28,682 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-27 21:59:28,682 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 58 transitions. [2020-08-27 21:59:28,682 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-27 21:59:28,682 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 58 transitions. [2020-08-27 21:59:28,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-27 21:59:28,683 INFO L414 BasicCegarLoop]: Found error trace [2020-08-27 21:59:28,683 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-27 21:59:28,683 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-27 21:59:28,687 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-27 21:59:28,687 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-27 21:59:28,688 INFO L82 PathProgramCache]: Analyzing trace with hash -1363997687, now seen corresponding path program 11 times [2020-08-27 21:59:28,688 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-27 21:59:28,688 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1491618627] [2020-08-27 21:59:28,688 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-27 21:59:28,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:28,954 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-27 21:59:28,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:28,961 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 0 proven. 198 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-27 21:59:28,961 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1491618627] [2020-08-27 21:59:28,962 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-27 21:59:28,962 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-27 21:59:28,962 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2071623710] [2020-08-27 21:59:28,962 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-27 21:59:28,963 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-27 21:59:28,963 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-27 21:59:28,963 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=211, Unknown=0, NotChecked=0, Total=240 [2020-08-27 21:59:28,963 INFO L87 Difference]: Start difference. First operand 46 states and 58 transitions. Second operand 16 states. [2020-08-27 21:59:29,328 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-27 21:59:29,328 INFO L93 Difference]: Finished difference Result 54 states and 67 transitions. [2020-08-27 21:59:29,329 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-27 21:59:29,329 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 45 [2020-08-27 21:59:29,329 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-27 21:59:29,330 INFO L225 Difference]: With dead ends: 54 [2020-08-27 21:59:29,330 INFO L226 Difference]: Without dead ends: 49 [2020-08-27 21:59:29,331 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=239, Unknown=0, NotChecked=0, Total=272 [2020-08-27 21:59:29,331 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-27 21:59:29,336 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-27 21:59:29,336 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-27 21:59:29,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 62 transitions. [2020-08-27 21:59:29,337 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 62 transitions. Word has length 45 [2020-08-27 21:59:29,337 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-27 21:59:29,337 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 62 transitions. [2020-08-27 21:59:29,338 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-27 21:59:29,338 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 62 transitions. [2020-08-27 21:59:29,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-27 21:59:29,339 INFO L414 BasicCegarLoop]: Found error trace [2020-08-27 21:59:29,339 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-27 21:59:29,339 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-27 21:59:29,339 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-27 21:59:29,339 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-27 21:59:29,340 INFO L82 PathProgramCache]: Analyzing trace with hash -641889742, now seen corresponding path program 12 times [2020-08-27 21:59:29,340 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-27 21:59:29,340 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1568607297] [2020-08-27 21:59:29,340 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-27 21:59:29,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:29,589 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-27 21:59:29,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:29,596 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 0 proven. 234 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-27 21:59:29,596 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1568607297] [2020-08-27 21:59:29,597 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-27 21:59:29,597 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-27 21:59:29,597 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2030474497] [2020-08-27 21:59:29,598 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-27 21:59:29,598 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-27 21:59:29,598 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-27 21:59:29,599 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2020-08-27 21:59:29,599 INFO L87 Difference]: Start difference. First operand 49 states and 62 transitions. Second operand 17 states. [2020-08-27 21:59:29,947 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-27 21:59:29,947 INFO L93 Difference]: Finished difference Result 57 states and 71 transitions. [2020-08-27 21:59:29,948 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-27 21:59:29,948 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 48 [2020-08-27 21:59:29,948 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-27 21:59:29,949 INFO L225 Difference]: With dead ends: 57 [2020-08-27 21:59:29,949 INFO L226 Difference]: Without dead ends: 52 [2020-08-27 21:59:29,950 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=35, Invalid=271, Unknown=0, NotChecked=0, Total=306 [2020-08-27 21:59:29,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-27 21:59:29,956 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2020-08-27 21:59:29,956 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-27 21:59:29,957 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 66 transitions. [2020-08-27 21:59:29,957 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 66 transitions. Word has length 48 [2020-08-27 21:59:29,958 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-27 21:59:29,958 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 66 transitions. [2020-08-27 21:59:29,958 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-27 21:59:29,958 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 66 transitions. [2020-08-27 21:59:29,959 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-08-27 21:59:29,959 INFO L414 BasicCegarLoop]: Found error trace [2020-08-27 21:59:29,959 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-27 21:59:29,959 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-27 21:59:29,960 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-27 21:59:29,960 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-27 21:59:29,960 INFO L82 PathProgramCache]: Analyzing trace with hash -1815285911, now seen corresponding path program 13 times [2020-08-27 21:59:29,960 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-27 21:59:29,960 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1376572538] [2020-08-27 21:59:29,961 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-27 21:59:29,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:30,245 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-27 21:59:30,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:30,261 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 0 proven. 273 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-27 21:59:30,262 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1376572538] [2020-08-27 21:59:30,262 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-27 21:59:30,262 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-27 21:59:30,262 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [302354716] [2020-08-27 21:59:30,263 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-27 21:59:30,263 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-27 21:59:30,263 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-27 21:59:30,264 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=273, Unknown=0, NotChecked=0, Total=306 [2020-08-27 21:59:30,264 INFO L87 Difference]: Start difference. First operand 52 states and 66 transitions. Second operand 18 states. [2020-08-27 21:59:30,629 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-27 21:59:30,629 INFO L93 Difference]: Finished difference Result 60 states and 75 transitions. [2020-08-27 21:59:30,630 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-27 21:59:30,630 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 51 [2020-08-27 21:59:30,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-27 21:59:30,631 INFO L225 Difference]: With dead ends: 60 [2020-08-27 21:59:30,631 INFO L226 Difference]: Without dead ends: 55 [2020-08-27 21:59:30,632 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=37, Invalid=305, Unknown=0, NotChecked=0, Total=342 [2020-08-27 21:59:30,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-27 21:59:30,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2020-08-27 21:59:30,637 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-27 21:59:30,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 70 transitions. [2020-08-27 21:59:30,638 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 70 transitions. Word has length 51 [2020-08-27 21:59:30,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-27 21:59:30,638 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 70 transitions. [2020-08-27 21:59:30,638 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-27 21:59:30,638 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 70 transitions. [2020-08-27 21:59:30,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-27 21:59:30,640 INFO L414 BasicCegarLoop]: Found error trace [2020-08-27 21:59:30,640 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-27 21:59:30,640 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-27 21:59:30,640 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-27 21:59:30,640 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-27 21:59:30,641 INFO L82 PathProgramCache]: Analyzing trace with hash -1721734446, now seen corresponding path program 14 times [2020-08-27 21:59:30,641 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-27 21:59:30,641 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [702994926] [2020-08-27 21:59:30,641 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-27 21:59:30,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:30,916 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-27 21:59:30,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:30,925 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 0 proven. 315 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-27 21:59:30,925 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [702994926] [2020-08-27 21:59:30,927 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-27 21:59:30,928 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-27 21:59:30,928 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1338728449] [2020-08-27 21:59:30,928 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-27 21:59:30,929 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-27 21:59:30,929 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-27 21:59:30,929 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2020-08-27 21:59:30,929 INFO L87 Difference]: Start difference. First operand 55 states and 70 transitions. Second operand 19 states. [2020-08-27 21:59:31,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-27 21:59:31,368 INFO L93 Difference]: Finished difference Result 63 states and 79 transitions. [2020-08-27 21:59:31,369 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-27 21:59:31,369 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 54 [2020-08-27 21:59:31,369 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-27 21:59:31,370 INFO L225 Difference]: With dead ends: 63 [2020-08-27 21:59:31,370 INFO L226 Difference]: Without dead ends: 58 [2020-08-27 21:59:31,371 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=39, Invalid=341, Unknown=0, NotChecked=0, Total=380 [2020-08-27 21:59:31,372 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-27 21:59:31,378 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2020-08-27 21:59:31,378 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-08-27 21:59:31,378 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 74 transitions. [2020-08-27 21:59:31,379 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 74 transitions. Word has length 54 [2020-08-27 21:59:31,379 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-27 21:59:31,379 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 74 transitions. [2020-08-27 21:59:31,379 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-27 21:59:31,379 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 74 transitions. [2020-08-27 21:59:31,380 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-08-27 21:59:31,380 INFO L414 BasicCegarLoop]: Found error trace [2020-08-27 21:59:31,381 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-27 21:59:31,381 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-27 21:59:31,381 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-27 21:59:31,381 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-27 21:59:31,381 INFO L82 PathProgramCache]: Analyzing trace with hash 2131151561, now seen corresponding path program 15 times [2020-08-27 21:59:31,382 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-27 21:59:31,382 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [34966916] [2020-08-27 21:59:31,382 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-27 21:59:31,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:31,732 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-27 21:59:31,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:31,740 INFO L134 CoverageAnalysis]: Checked inductivity of 360 backedges. 0 proven. 360 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-27 21:59:31,740 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [34966916] [2020-08-27 21:59:31,741 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-27 21:59:31,741 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-27 21:59:31,741 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1458651344] [2020-08-27 21:59:31,741 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-27 21:59:31,742 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-27 21:59:31,742 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-27 21:59:31,742 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=343, Unknown=0, NotChecked=0, Total=380 [2020-08-27 21:59:31,742 INFO L87 Difference]: Start difference. First operand 58 states and 74 transitions. Second operand 20 states. [2020-08-27 21:59:32,257 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-27 21:59:32,258 INFO L93 Difference]: Finished difference Result 66 states and 83 transitions. [2020-08-27 21:59:32,258 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-27 21:59:32,258 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 57 [2020-08-27 21:59:32,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-27 21:59:32,260 INFO L225 Difference]: With dead ends: 66 [2020-08-27 21:59:32,260 INFO L226 Difference]: Without dead ends: 61 [2020-08-27 21:59:32,261 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=41, Invalid=379, Unknown=0, NotChecked=0, Total=420 [2020-08-27 21:59:32,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-08-27 21:59:32,267 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2020-08-27 21:59:32,267 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-08-27 21:59:32,268 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 78 transitions. [2020-08-27 21:59:32,268 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 78 transitions. Word has length 57 [2020-08-27 21:59:32,269 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-27 21:59:32,269 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 78 transitions. [2020-08-27 21:59:32,269 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-27 21:59:32,269 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 78 transitions. [2020-08-27 21:59:32,270 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-08-27 21:59:32,270 INFO L414 BasicCegarLoop]: Found error trace [2020-08-27 21:59:32,270 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-27 21:59:32,270 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-27 21:59:32,271 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-27 21:59:32,271 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-27 21:59:32,271 INFO L82 PathProgramCache]: Analyzing trace with hash 457200498, now seen corresponding path program 16 times [2020-08-27 21:59:32,271 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-27 21:59:32,272 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [226429535] [2020-08-27 21:59:32,272 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-27 21:59:32,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:32,656 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-27 21:59:32,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:32,665 INFO L134 CoverageAnalysis]: Checked inductivity of 408 backedges. 0 proven. 408 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-27 21:59:32,665 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [226429535] [2020-08-27 21:59:32,666 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-27 21:59:32,666 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-27 21:59:32,666 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2132776237] [2020-08-27 21:59:32,667 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-27 21:59:32,667 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-27 21:59:32,667 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-27 21:59:32,668 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=381, Unknown=0, NotChecked=0, Total=420 [2020-08-27 21:59:32,668 INFO L87 Difference]: Start difference. First operand 61 states and 78 transitions. Second operand 21 states. [2020-08-27 21:59:33,196 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-27 21:59:33,196 INFO L93 Difference]: Finished difference Result 69 states and 87 transitions. [2020-08-27 21:59:33,200 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-27 21:59:33,200 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 60 [2020-08-27 21:59:33,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-27 21:59:33,201 INFO L225 Difference]: With dead ends: 69 [2020-08-27 21:59:33,201 INFO L226 Difference]: Without dead ends: 64 [2020-08-27 21:59:33,202 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=43, Invalid=419, Unknown=0, NotChecked=0, Total=462 [2020-08-27 21:59:33,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-08-27 21:59:33,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2020-08-27 21:59:33,208 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-08-27 21:59:33,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 82 transitions. [2020-08-27 21:59:33,209 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 82 transitions. Word has length 60 [2020-08-27 21:59:33,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-27 21:59:33,210 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 82 transitions. [2020-08-27 21:59:33,210 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-27 21:59:33,210 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 82 transitions. [2020-08-27 21:59:33,211 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2020-08-27 21:59:33,211 INFO L414 BasicCegarLoop]: Found error trace [2020-08-27 21:59:33,211 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-27 21:59:33,211 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-27 21:59:33,211 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-27 21:59:33,212 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-27 21:59:33,212 INFO L82 PathProgramCache]: Analyzing trace with hash 646356521, now seen corresponding path program 17 times [2020-08-27 21:59:33,212 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-27 21:59:33,212 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1553461712] [2020-08-27 21:59:33,212 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-27 21:59:33,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:33,600 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-27 21:59:33,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:33,615 INFO L134 CoverageAnalysis]: Checked inductivity of 459 backedges. 0 proven. 459 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-27 21:59:33,616 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1553461712] [2020-08-27 21:59:33,616 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-27 21:59:33,616 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-27 21:59:33,617 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [984879377] [2020-08-27 21:59:33,617 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-27 21:59:33,618 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-27 21:59:33,618 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-27 21:59:33,618 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=421, Unknown=0, NotChecked=0, Total=462 [2020-08-27 21:59:33,618 INFO L87 Difference]: Start difference. First operand 64 states and 82 transitions. Second operand 22 states. [2020-08-27 21:59:34,169 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-27 21:59:34,169 INFO L93 Difference]: Finished difference Result 72 states and 91 transitions. [2020-08-27 21:59:34,170 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-27 21:59:34,170 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 63 [2020-08-27 21:59:34,170 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-27 21:59:34,171 INFO L225 Difference]: With dead ends: 72 [2020-08-27 21:59:34,171 INFO L226 Difference]: Without dead ends: 67 [2020-08-27 21:59:34,172 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=45, Invalid=461, Unknown=0, NotChecked=0, Total=506 [2020-08-27 21:59:34,173 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-08-27 21:59:34,179 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2020-08-27 21:59:34,179 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-08-27 21:59:34,180 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 86 transitions. [2020-08-27 21:59:34,180 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 86 transitions. Word has length 63 [2020-08-27 21:59:34,180 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-27 21:59:34,180 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 86 transitions. [2020-08-27 21:59:34,181 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-27 21:59:34,181 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 86 transitions. [2020-08-27 21:59:34,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-08-27 21:59:34,181 INFO L414 BasicCegarLoop]: Found error trace [2020-08-27 21:59:34,182 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-27 21:59:34,182 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-27 21:59:34,182 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-27 21:59:34,182 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-27 21:59:34,183 INFO L82 PathProgramCache]: Analyzing trace with hash 796345362, now seen corresponding path program 18 times [2020-08-27 21:59:34,183 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-27 21:59:34,183 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [227294750] [2020-08-27 21:59:34,183 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-27 21:59:34,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:34,622 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-27 21:59:34,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:34,631 INFO L134 CoverageAnalysis]: Checked inductivity of 513 backedges. 0 proven. 513 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-27 21:59:34,631 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [227294750] [2020-08-27 21:59:34,632 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-27 21:59:34,632 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-27 21:59:34,632 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1577200622] [2020-08-27 21:59:34,632 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-27 21:59:34,633 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-27 21:59:34,633 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-27 21:59:34,633 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=463, Unknown=0, NotChecked=0, Total=506 [2020-08-27 21:59:34,633 INFO L87 Difference]: Start difference. First operand 67 states and 86 transitions. Second operand 23 states. [2020-08-27 21:59:35,325 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-27 21:59:35,325 INFO L93 Difference]: Finished difference Result 75 states and 95 transitions. [2020-08-27 21:59:35,326 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-27 21:59:35,326 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 66 [2020-08-27 21:59:35,326 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-27 21:59:35,327 INFO L225 Difference]: With dead ends: 75 [2020-08-27 21:59:35,327 INFO L226 Difference]: Without dead ends: 70 [2020-08-27 21:59:35,328 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=47, Invalid=505, Unknown=0, NotChecked=0, Total=552 [2020-08-27 21:59:35,329 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-08-27 21:59:35,335 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2020-08-27 21:59:35,335 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-08-27 21:59:35,336 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 90 transitions. [2020-08-27 21:59:35,336 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 90 transitions. Word has length 66 [2020-08-27 21:59:35,336 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-27 21:59:35,337 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 90 transitions. [2020-08-27 21:59:35,337 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-27 21:59:35,337 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 90 transitions. [2020-08-27 21:59:35,338 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-08-27 21:59:35,338 INFO L414 BasicCegarLoop]: Found error trace [2020-08-27 21:59:35,338 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-27 21:59:35,338 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-27 21:59:35,338 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-27 21:59:35,339 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-27 21:59:35,339 INFO L82 PathProgramCache]: Analyzing trace with hash -1947047543, now seen corresponding path program 19 times [2020-08-27 21:59:35,339 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-27 21:59:35,339 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2061340192] [2020-08-27 21:59:35,339 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-27 21:59:35,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:35,826 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-27 21:59:35,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:35,836 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 0 proven. 570 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-27 21:59:35,837 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2061340192] [2020-08-27 21:59:35,837 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-27 21:59:35,837 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-27 21:59:35,838 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1287921271] [2020-08-27 21:59:35,838 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-27 21:59:35,838 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-27 21:59:35,839 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-27 21:59:35,839 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=507, Unknown=0, NotChecked=0, Total=552 [2020-08-27 21:59:35,839 INFO L87 Difference]: Start difference. First operand 70 states and 90 transitions. Second operand 24 states. [2020-08-27 21:59:36,591 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-27 21:59:36,591 INFO L93 Difference]: Finished difference Result 78 states and 99 transitions. [2020-08-27 21:59:36,592 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-27 21:59:36,592 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 69 [2020-08-27 21:59:36,592 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-27 21:59:36,593 INFO L225 Difference]: With dead ends: 78 [2020-08-27 21:59:36,594 INFO L226 Difference]: Without dead ends: 73 [2020-08-27 21:59:36,595 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=49, Invalid=551, Unknown=0, NotChecked=0, Total=600 [2020-08-27 21:59:36,595 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-08-27 21:59:36,601 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 73. [2020-08-27 21:59:36,601 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-08-27 21:59:36,602 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 94 transitions. [2020-08-27 21:59:36,602 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 94 transitions. Word has length 69 [2020-08-27 21:59:36,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-27 21:59:36,603 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 94 transitions. [2020-08-27 21:59:36,603 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-27 21:59:36,603 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 94 transitions. [2020-08-27 21:59:36,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-08-27 21:59:36,604 INFO L414 BasicCegarLoop]: Found error trace [2020-08-27 21:59:36,604 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-27 21:59:36,604 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-27 21:59:36,604 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-27 21:59:36,604 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-27 21:59:36,605 INFO L82 PathProgramCache]: Analyzing trace with hash -1432404814, now seen corresponding path program 20 times [2020-08-27 21:59:36,605 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-27 21:59:36,605 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [51125647] [2020-08-27 21:59:36,605 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-27 21:59:36,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:37,130 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-27 21:59:37,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:37,140 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-27 21:59:37,141 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [51125647] [2020-08-27 21:59:37,141 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-27 21:59:37,141 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-27 21:59:37,142 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [570742516] [2020-08-27 21:59:37,142 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-27 21:59:37,142 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-27 21:59:37,142 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-27 21:59:37,142 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=553, Unknown=0, NotChecked=0, Total=600 [2020-08-27 21:59:37,143 INFO L87 Difference]: Start difference. First operand 73 states and 94 transitions. Second operand 25 states. [2020-08-27 21:59:37,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-27 21:59:37,873 INFO L93 Difference]: Finished difference Result 81 states and 103 transitions. [2020-08-27 21:59:37,875 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-27 21:59:37,876 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 72 [2020-08-27 21:59:37,876 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-27 21:59:37,876 INFO L225 Difference]: With dead ends: 81 [2020-08-27 21:59:37,877 INFO L226 Difference]: Without dead ends: 76 [2020-08-27 21:59:37,877 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=51, Invalid=599, Unknown=0, NotChecked=0, Total=650 [2020-08-27 21:59:37,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-08-27 21:59:37,882 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 76. [2020-08-27 21:59:37,882 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-08-27 21:59:37,883 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 98 transitions. [2020-08-27 21:59:37,883 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 98 transitions. Word has length 72 [2020-08-27 21:59:37,883 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-27 21:59:37,883 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 98 transitions. [2020-08-27 21:59:37,883 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-27 21:59:37,884 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 98 transitions. [2020-08-27 21:59:37,884 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2020-08-27 21:59:37,884 INFO L414 BasicCegarLoop]: Found error trace [2020-08-27 21:59:37,885 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-27 21:59:37,885 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-27 21:59:37,885 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-27 21:59:37,885 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-27 21:59:37,885 INFO L82 PathProgramCache]: Analyzing trace with hash 1550855401, now seen corresponding path program 21 times [2020-08-27 21:59:37,886 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-27 21:59:37,886 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1528092248] [2020-08-27 21:59:37,886 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-27 21:59:37,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:38,432 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-27 21:59:38,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:38,448 INFO L134 CoverageAnalysis]: Checked inductivity of 693 backedges. 0 proven. 693 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-27 21:59:38,448 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1528092248] [2020-08-27 21:59:38,449 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-27 21:59:38,449 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-27 21:59:38,449 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1936308974] [2020-08-27 21:59:38,449 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-27 21:59:38,450 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-27 21:59:38,450 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-27 21:59:38,450 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=601, Unknown=0, NotChecked=0, Total=650 [2020-08-27 21:59:38,450 INFO L87 Difference]: Start difference. First operand 76 states and 98 transitions. Second operand 26 states. [2020-08-27 21:59:39,254 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-27 21:59:39,254 INFO L93 Difference]: Finished difference Result 84 states and 107 transitions. [2020-08-27 21:59:39,255 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-27 21:59:39,255 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 75 [2020-08-27 21:59:39,255 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-27 21:59:39,256 INFO L225 Difference]: With dead ends: 84 [2020-08-27 21:59:39,256 INFO L226 Difference]: Without dead ends: 79 [2020-08-27 21:59:39,257 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=53, Invalid=649, Unknown=0, NotChecked=0, Total=702 [2020-08-27 21:59:39,257 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2020-08-27 21:59:39,262 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2020-08-27 21:59:39,263 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-08-27 21:59:39,263 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 102 transitions. [2020-08-27 21:59:39,264 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 102 transitions. Word has length 75 [2020-08-27 21:59:39,264 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-27 21:59:39,264 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 102 transitions. [2020-08-27 21:59:39,264 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-27 21:59:39,264 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 102 transitions. [2020-08-27 21:59:39,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-08-27 21:59:39,265 INFO L414 BasicCegarLoop]: Found error trace [2020-08-27 21:59:39,265 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-27 21:59:39,266 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-27 21:59:39,266 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-27 21:59:39,266 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-27 21:59:39,266 INFO L82 PathProgramCache]: Analyzing trace with hash 97664338, now seen corresponding path program 22 times [2020-08-27 21:59:39,266 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-27 21:59:39,267 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [386353347] [2020-08-27 21:59:39,267 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-27 21:59:39,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:39,805 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-27 21:59:39,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:39,828 INFO L134 CoverageAnalysis]: Checked inductivity of 759 backedges. 0 proven. 759 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-27 21:59:39,828 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [386353347] [2020-08-27 21:59:39,828 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-27 21:59:39,829 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-27 21:59:39,829 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1274605656] [2020-08-27 21:59:39,830 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-27 21:59:39,830 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-27 21:59:39,830 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-27 21:59:39,831 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=651, Unknown=0, NotChecked=0, Total=702 [2020-08-27 21:59:39,831 INFO L87 Difference]: Start difference. First operand 79 states and 102 transitions. Second operand 27 states. [2020-08-27 21:59:40,764 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-27 21:59:40,765 INFO L93 Difference]: Finished difference Result 87 states and 111 transitions. [2020-08-27 21:59:40,769 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-27 21:59:40,769 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 78 [2020-08-27 21:59:40,769 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-27 21:59:40,770 INFO L225 Difference]: With dead ends: 87 [2020-08-27 21:59:40,770 INFO L226 Difference]: Without dead ends: 82 [2020-08-27 21:59:40,771 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=55, Invalid=701, Unknown=0, NotChecked=0, Total=756 [2020-08-27 21:59:40,771 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-08-27 21:59:40,776 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 82. [2020-08-27 21:59:40,777 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2020-08-27 21:59:40,777 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 106 transitions. [2020-08-27 21:59:40,777 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 106 transitions. Word has length 78 [2020-08-27 21:59:40,778 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-27 21:59:40,778 INFO L479 AbstractCegarLoop]: Abstraction has 82 states and 106 transitions. [2020-08-27 21:59:40,778 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-27 21:59:40,778 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 106 transitions. [2020-08-27 21:59:40,779 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2020-08-27 21:59:40,779 INFO L414 BasicCegarLoop]: Found error trace [2020-08-27 21:59:40,779 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-27 21:59:40,779 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-27 21:59:40,779 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-27 21:59:40,780 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-27 21:59:40,780 INFO L82 PathProgramCache]: Analyzing trace with hash 1353050185, now seen corresponding path program 23 times [2020-08-27 21:59:40,780 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-27 21:59:40,780 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [631191642] [2020-08-27 21:59:40,780 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-27 21:59:40,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:41,460 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-27 21:59:41,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:41,475 INFO L134 CoverageAnalysis]: Checked inductivity of 828 backedges. 0 proven. 828 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-27 21:59:41,475 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [631191642] [2020-08-27 21:59:41,476 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-27 21:59:41,476 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-27 21:59:41,476 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1743069707] [2020-08-27 21:59:41,476 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-27 21:59:41,477 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-27 21:59:41,477 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-27 21:59:41,477 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=703, Unknown=0, NotChecked=0, Total=756 [2020-08-27 21:59:41,477 INFO L87 Difference]: Start difference. First operand 82 states and 106 transitions. Second operand 28 states. [2020-08-27 21:59:42,508 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-27 21:59:42,508 INFO L93 Difference]: Finished difference Result 90 states and 115 transitions. [2020-08-27 21:59:42,510 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-27 21:59:42,510 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 81 [2020-08-27 21:59:42,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-27 21:59:42,511 INFO L225 Difference]: With dead ends: 90 [2020-08-27 21:59:42,511 INFO L226 Difference]: Without dead ends: 85 [2020-08-27 21:59:42,511 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=57, Invalid=755, Unknown=0, NotChecked=0, Total=812 [2020-08-27 21:59:42,512 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2020-08-27 21:59:42,517 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 85. [2020-08-27 21:59:42,517 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-08-27 21:59:42,518 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 110 transitions. [2020-08-27 21:59:42,518 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 110 transitions. Word has length 81 [2020-08-27 21:59:42,518 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-27 21:59:42,518 INFO L479 AbstractCegarLoop]: Abstraction has 85 states and 110 transitions. [2020-08-27 21:59:42,519 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-27 21:59:42,519 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 110 transitions. [2020-08-27 21:59:42,519 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2020-08-27 21:59:42,520 INFO L414 BasicCegarLoop]: Found error trace [2020-08-27 21:59:42,520 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-27 21:59:42,520 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-27 21:59:42,520 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-27 21:59:42,520 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-27 21:59:42,520 INFO L82 PathProgramCache]: Analyzing trace with hash -22395406, now seen corresponding path program 24 times [2020-08-27 21:59:42,521 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-27 21:59:42,521 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1730333483] [2020-08-27 21:59:42,521 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-27 21:59:42,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:43,186 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-27 21:59:43,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:43,204 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-27 21:59:43,205 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1730333483] [2020-08-27 21:59:43,205 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-27 21:59:43,205 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-27 21:59:43,205 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [977109333] [2020-08-27 21:59:43,207 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-27 21:59:43,207 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-27 21:59:43,208 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-27 21:59:43,208 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=757, Unknown=0, NotChecked=0, Total=812 [2020-08-27 21:59:43,208 INFO L87 Difference]: Start difference. First operand 85 states and 110 transitions. Second operand 29 states. [2020-08-27 21:59:44,267 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-27 21:59:44,267 INFO L93 Difference]: Finished difference Result 93 states and 119 transitions. [2020-08-27 21:59:44,268 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-27 21:59:44,268 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 84 [2020-08-27 21:59:44,269 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-27 21:59:44,270 INFO L225 Difference]: With dead ends: 93 [2020-08-27 21:59:44,270 INFO L226 Difference]: Without dead ends: 88 [2020-08-27 21:59:44,271 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=59, Invalid=811, Unknown=0, NotChecked=0, Total=870 [2020-08-27 21:59:44,271 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-08-27 21:59:44,278 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2020-08-27 21:59:44,278 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2020-08-27 21:59:44,279 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 114 transitions. [2020-08-27 21:59:44,279 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 114 transitions. Word has length 84 [2020-08-27 21:59:44,279 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-27 21:59:44,279 INFO L479 AbstractCegarLoop]: Abstraction has 88 states and 114 transitions. [2020-08-27 21:59:44,280 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-27 21:59:44,280 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 114 transitions. [2020-08-27 21:59:44,280 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2020-08-27 21:59:44,281 INFO L414 BasicCegarLoop]: Found error trace [2020-08-27 21:59:44,281 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-27 21:59:44,281 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-27 21:59:44,281 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-27 21:59:44,281 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-27 21:59:44,282 INFO L82 PathProgramCache]: Analyzing trace with hash -1933993047, now seen corresponding path program 25 times [2020-08-27 21:59:44,282 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-27 21:59:44,282 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1180916266] [2020-08-27 21:59:44,282 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-27 21:59:44,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:45,148 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-27 21:59:45,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:45,173 INFO L134 CoverageAnalysis]: Checked inductivity of 975 backedges. 0 proven. 975 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-27 21:59:45,173 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1180916266] [2020-08-27 21:59:45,174 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-27 21:59:45,175 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-27 21:59:45,175 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1669780592] [2020-08-27 21:59:45,176 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-27 21:59:45,176 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-27 21:59:45,176 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-27 21:59:45,177 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=813, Unknown=0, NotChecked=0, Total=870 [2020-08-27 21:59:45,177 INFO L87 Difference]: Start difference. First operand 88 states and 114 transitions. Second operand 30 states. [2020-08-27 21:59:46,357 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-27 21:59:46,358 INFO L93 Difference]: Finished difference Result 96 states and 123 transitions. [2020-08-27 21:59:46,358 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-27 21:59:46,358 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 87 [2020-08-27 21:59:46,359 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-27 21:59:46,360 INFO L225 Difference]: With dead ends: 96 [2020-08-27 21:59:46,360 INFO L226 Difference]: Without dead ends: 91 [2020-08-27 21:59:46,360 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=61, Invalid=869, Unknown=0, NotChecked=0, Total=930 [2020-08-27 21:59:46,361 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2020-08-27 21:59:46,367 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2020-08-27 21:59:46,367 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-08-27 21:59:46,368 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 118 transitions. [2020-08-27 21:59:46,368 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 118 transitions. Word has length 87 [2020-08-27 21:59:46,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-27 21:59:46,369 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 118 transitions. [2020-08-27 21:59:46,369 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-27 21:59:46,369 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 118 transitions. [2020-08-27 21:59:46,369 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2020-08-27 21:59:46,370 INFO L414 BasicCegarLoop]: Found error trace [2020-08-27 21:59:46,370 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-27 21:59:46,370 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-27 21:59:46,370 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-27 21:59:46,370 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-27 21:59:46,371 INFO L82 PathProgramCache]: Analyzing trace with hash 927028882, now seen corresponding path program 26 times [2020-08-27 21:59:46,371 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-27 21:59:46,371 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [42284050] [2020-08-27 21:59:46,371 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-27 21:59:46,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:47,125 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-27 21:59:47,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:47,146 INFO L134 CoverageAnalysis]: Checked inductivity of 1053 backedges. 0 proven. 1053 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-27 21:59:47,146 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [42284050] [2020-08-27 21:59:47,147 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-27 21:59:47,147 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-27 21:59:47,147 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1622611700] [2020-08-27 21:59:47,147 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-27 21:59:47,148 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-27 21:59:47,148 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-27 21:59:47,148 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=871, Unknown=0, NotChecked=0, Total=930 [2020-08-27 21:59:47,148 INFO L87 Difference]: Start difference. First operand 91 states and 118 transitions. Second operand 31 states. [2020-08-27 21:59:48,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-27 21:59:48,403 INFO L93 Difference]: Finished difference Result 99 states and 127 transitions. [2020-08-27 21:59:48,404 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-27 21:59:48,404 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 90 [2020-08-27 21:59:48,404 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-27 21:59:48,405 INFO L225 Difference]: With dead ends: 99 [2020-08-27 21:59:48,405 INFO L226 Difference]: Without dead ends: 94 [2020-08-27 21:59:48,406 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=63, Invalid=929, Unknown=0, NotChecked=0, Total=992 [2020-08-27 21:59:48,407 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-08-27 21:59:48,412 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 94. [2020-08-27 21:59:48,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2020-08-27 21:59:48,413 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 122 transitions. [2020-08-27 21:59:48,414 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 122 transitions. Word has length 90 [2020-08-27 21:59:48,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-27 21:59:48,414 INFO L479 AbstractCegarLoop]: Abstraction has 94 states and 122 transitions. [2020-08-27 21:59:48,414 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-27 21:59:48,414 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 122 transitions. [2020-08-27 21:59:48,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2020-08-27 21:59:48,415 INFO L414 BasicCegarLoop]: Found error trace [2020-08-27 21:59:48,415 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-27 21:59:48,416 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-27 21:59:48,416 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-27 21:59:48,416 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-27 21:59:48,416 INFO L82 PathProgramCache]: Analyzing trace with hash 5326601, now seen corresponding path program 27 times [2020-08-27 21:59:48,416 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-27 21:59:48,417 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1410557057] [2020-08-27 21:59:48,417 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-27 21:59:48,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:49,251 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-27 21:59:49,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:49,267 INFO L134 CoverageAnalysis]: Checked inductivity of 1134 backedges. 0 proven. 1134 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-27 21:59:49,267 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1410557057] [2020-08-27 21:59:49,267 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-27 21:59:49,268 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-27 21:59:49,268 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1692960246] [2020-08-27 21:59:49,268 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-27 21:59:49,268 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-27 21:59:49,268 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-27 21:59:49,269 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=931, Unknown=0, NotChecked=0, Total=992 [2020-08-27 21:59:49,269 INFO L87 Difference]: Start difference. First operand 94 states and 122 transitions. Second operand 32 states. [2020-08-27 21:59:50,698 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-27 21:59:50,699 INFO L93 Difference]: Finished difference Result 102 states and 131 transitions. [2020-08-27 21:59:50,699 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-27 21:59:50,700 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 93 [2020-08-27 21:59:50,700 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-27 21:59:50,700 INFO L225 Difference]: With dead ends: 102 [2020-08-27 21:59:50,700 INFO L226 Difference]: Without dead ends: 97 [2020-08-27 21:59:50,701 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=65, Invalid=991, Unknown=0, NotChecked=0, Total=1056 [2020-08-27 21:59:50,702 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2020-08-27 21:59:50,709 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 97. [2020-08-27 21:59:50,709 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2020-08-27 21:59:50,710 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 126 transitions. [2020-08-27 21:59:50,710 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 126 transitions. Word has length 93 [2020-08-27 21:59:50,710 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-27 21:59:50,710 INFO L479 AbstractCegarLoop]: Abstraction has 97 states and 126 transitions. [2020-08-27 21:59:50,710 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-27 21:59:50,711 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 126 transitions. [2020-08-27 21:59:50,713 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-08-27 21:59:50,713 INFO L414 BasicCegarLoop]: Found error trace [2020-08-27 21:59:50,713 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-27 21:59:50,713 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-27 21:59:50,713 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-27 21:59:50,714 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-27 21:59:50,714 INFO L82 PathProgramCache]: Analyzing trace with hash -701403342, now seen corresponding path program 28 times [2020-08-27 21:59:50,714 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-27 21:59:50,714 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1240042047] [2020-08-27 21:59:50,714 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-27 21:59:50,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:51,633 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-27 21:59:51,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:51,648 INFO L134 CoverageAnalysis]: Checked inductivity of 1218 backedges. 0 proven. 1218 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-27 21:59:51,649 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1240042047] [2020-08-27 21:59:51,649 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-27 21:59:51,649 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-27 21:59:51,649 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [168219446] [2020-08-27 21:59:51,649 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-27 21:59:51,650 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-27 21:59:51,650 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-27 21:59:51,650 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=993, Unknown=0, NotChecked=0, Total=1056 [2020-08-27 21:59:51,650 INFO L87 Difference]: Start difference. First operand 97 states and 126 transitions. Second operand 33 states. [2020-08-27 21:59:53,174 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-27 21:59:53,174 INFO L93 Difference]: Finished difference Result 105 states and 135 transitions. [2020-08-27 21:59:53,181 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-27 21:59:53,181 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 96 [2020-08-27 21:59:53,181 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-27 21:59:53,182 INFO L225 Difference]: With dead ends: 105 [2020-08-27 21:59:53,182 INFO L226 Difference]: Without dead ends: 100 [2020-08-27 21:59:53,183 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=67, Invalid=1055, Unknown=0, NotChecked=0, Total=1122 [2020-08-27 21:59:53,183 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-08-27 21:59:53,190 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 100. [2020-08-27 21:59:53,191 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2020-08-27 21:59:53,191 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 130 transitions. [2020-08-27 21:59:53,192 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 130 transitions. Word has length 96 [2020-08-27 21:59:53,192 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-27 21:59:53,192 INFO L479 AbstractCegarLoop]: Abstraction has 100 states and 130 transitions. [2020-08-27 21:59:53,192 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-27 21:59:53,192 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 130 transitions. [2020-08-27 21:59:53,193 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2020-08-27 21:59:53,193 INFO L414 BasicCegarLoop]: Found error trace [2020-08-27 21:59:53,193 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-27 21:59:53,194 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-27 21:59:53,194 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-27 21:59:53,194 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-27 21:59:53,194 INFO L82 PathProgramCache]: Analyzing trace with hash -963450263, now seen corresponding path program 29 times [2020-08-27 21:59:53,194 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-27 21:59:53,195 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [554054624] [2020-08-27 21:59:53,195 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-27 21:59:53,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:54,146 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-27 21:59:54,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:54,163 INFO L134 CoverageAnalysis]: Checked inductivity of 1305 backedges. 0 proven. 1305 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-27 21:59:54,163 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [554054624] [2020-08-27 21:59:54,164 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-27 21:59:54,164 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-27 21:59:54,164 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [458565350] [2020-08-27 21:59:54,164 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-27 21:59:54,164 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-27 21:59:54,164 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-27 21:59:54,165 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=1057, Unknown=0, NotChecked=0, Total=1122 [2020-08-27 21:59:54,165 INFO L87 Difference]: Start difference. First operand 100 states and 130 transitions. Second operand 34 states. [2020-08-27 21:59:55,750 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-27 21:59:55,751 INFO L93 Difference]: Finished difference Result 108 states and 139 transitions. [2020-08-27 21:59:55,752 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-27 21:59:55,753 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 99 [2020-08-27 21:59:55,753 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-27 21:59:55,754 INFO L225 Difference]: With dead ends: 108 [2020-08-27 21:59:55,754 INFO L226 Difference]: Without dead ends: 103 [2020-08-27 21:59:55,754 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=69, Invalid=1121, Unknown=0, NotChecked=0, Total=1190 [2020-08-27 21:59:55,755 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2020-08-27 21:59:55,761 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2020-08-27 21:59:55,761 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-08-27 21:59:55,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 134 transitions. [2020-08-27 21:59:55,762 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 134 transitions. Word has length 99 [2020-08-27 21:59:55,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-27 21:59:55,762 INFO L479 AbstractCegarLoop]: Abstraction has 103 states and 134 transitions. [2020-08-27 21:59:55,763 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-27 21:59:55,763 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 134 transitions. [2020-08-27 21:59:55,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2020-08-27 21:59:55,763 INFO L414 BasicCegarLoop]: Found error trace [2020-08-27 21:59:55,764 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-27 21:59:55,764 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-27 21:59:55,764 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-27 21:59:55,764 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-27 21:59:55,764 INFO L82 PathProgramCache]: Analyzing trace with hash 647270354, now seen corresponding path program 30 times [2020-08-27 21:59:55,764 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-27 21:59:55,765 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [808542658] [2020-08-27 21:59:55,765 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-27 21:59:55,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:56,771 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-27 21:59:56,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:56,789 INFO L134 CoverageAnalysis]: Checked inductivity of 1395 backedges. 0 proven. 1395 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-27 21:59:56,789 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [808542658] [2020-08-27 21:59:56,789 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-27 21:59:56,789 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-27 21:59:56,790 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1832697022] [2020-08-27 21:59:56,790 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-27 21:59:56,790 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-27 21:59:56,790 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-27 21:59:56,791 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=1123, Unknown=0, NotChecked=0, Total=1190 [2020-08-27 21:59:56,791 INFO L87 Difference]: Start difference. First operand 103 states and 134 transitions. Second operand 35 states. [2020-08-27 21:59:58,536 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-27 21:59:58,536 INFO L93 Difference]: Finished difference Result 111 states and 143 transitions. [2020-08-27 21:59:58,542 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-27 21:59:58,542 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 102 [2020-08-27 21:59:58,542 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-27 21:59:58,543 INFO L225 Difference]: With dead ends: 111 [2020-08-27 21:59:58,543 INFO L226 Difference]: Without dead ends: 106 [2020-08-27 21:59:58,544 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=71, Invalid=1189, Unknown=0, NotChecked=0, Total=1260 [2020-08-27 21:59:58,545 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-08-27 21:59:58,551 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 106. [2020-08-27 21:59:58,552 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2020-08-27 21:59:58,552 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 138 transitions. [2020-08-27 21:59:58,553 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 138 transitions. Word has length 102 [2020-08-27 21:59:58,553 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-27 21:59:58,553 INFO L479 AbstractCegarLoop]: Abstraction has 106 states and 138 transitions. [2020-08-27 21:59:58,553 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-27 21:59:58,553 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 138 transitions. [2020-08-27 21:59:58,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2020-08-27 21:59:58,554 INFO L414 BasicCegarLoop]: Found error trace [2020-08-27 21:59:58,554 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-27 21:59:58,554 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-27 21:59:58,554 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-27 21:59:58,555 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-27 21:59:58,555 INFO L82 PathProgramCache]: Analyzing trace with hash -2044426807, now seen corresponding path program 31 times [2020-08-27 21:59:58,555 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-27 21:59:58,555 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [999837653] [2020-08-27 21:59:58,555 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-27 21:59:58,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:59,537 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-27 21:59:59,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 21:59:59,560 INFO L134 CoverageAnalysis]: Checked inductivity of 1488 backedges. 0 proven. 1488 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-27 21:59:59,561 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [999837653] [2020-08-27 21:59:59,561 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-27 21:59:59,561 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-27 21:59:59,561 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [701754240] [2020-08-27 21:59:59,561 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-27 21:59:59,562 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-27 21:59:59,562 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-27 21:59:59,562 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=1191, Unknown=0, NotChecked=0, Total=1260 [2020-08-27 21:59:59,563 INFO L87 Difference]: Start difference. First operand 106 states and 138 transitions. Second operand 36 states. [2020-08-27 22:00:01,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-27 22:00:01,394 INFO L93 Difference]: Finished difference Result 114 states and 147 transitions. [2020-08-27 22:00:01,400 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-27 22:00:01,400 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 105 [2020-08-27 22:00:01,400 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-27 22:00:01,401 INFO L225 Difference]: With dead ends: 114 [2020-08-27 22:00:01,401 INFO L226 Difference]: Without dead ends: 109 [2020-08-27 22:00:01,402 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=73, Invalid=1259, Unknown=0, NotChecked=0, Total=1332 [2020-08-27 22:00:01,403 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2020-08-27 22:00:01,409 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 109. [2020-08-27 22:00:01,409 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 109 states. [2020-08-27 22:00:01,410 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 142 transitions. [2020-08-27 22:00:01,410 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 142 transitions. Word has length 105 [2020-08-27 22:00:01,410 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-27 22:00:01,410 INFO L479 AbstractCegarLoop]: Abstraction has 109 states and 142 transitions. [2020-08-27 22:00:01,410 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-27 22:00:01,411 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 142 transitions. [2020-08-27 22:00:01,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2020-08-27 22:00:01,411 INFO L414 BasicCegarLoop]: Found error trace [2020-08-27 22:00:01,411 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-27 22:00:01,412 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-27 22:00:01,412 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-27 22:00:01,412 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-27 22:00:01,412 INFO L82 PathProgramCache]: Analyzing trace with hash 939833458, now seen corresponding path program 32 times [2020-08-27 22:00:01,412 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-27 22:00:01,413 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [10518088] [2020-08-27 22:00:01,413 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-27 22:00:01,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 22:00:02,526 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-27 22:00:02,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 22:00:02,553 INFO L134 CoverageAnalysis]: Checked inductivity of 1584 backedges. 0 proven. 1584 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-27 22:00:02,554 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [10518088] [2020-08-27 22:00:02,554 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-27 22:00:02,554 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-27 22:00:02,554 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1270306151] [2020-08-27 22:00:02,555 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-27 22:00:02,555 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-27 22:00:02,555 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-27 22:00:02,556 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=1261, Unknown=0, NotChecked=0, Total=1332 [2020-08-27 22:00:02,556 INFO L87 Difference]: Start difference. First operand 109 states and 142 transitions. Second operand 37 states. [2020-08-27 22:00:04,548 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-27 22:00:04,548 INFO L93 Difference]: Finished difference Result 117 states and 151 transitions. [2020-08-27 22:00:04,548 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-27 22:00:04,549 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 108 [2020-08-27 22:00:04,549 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-27 22:00:04,549 INFO L225 Difference]: With dead ends: 117 [2020-08-27 22:00:04,550 INFO L226 Difference]: Without dead ends: 112 [2020-08-27 22:00:04,551 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=75, Invalid=1331, Unknown=0, NotChecked=0, Total=1406 [2020-08-27 22:00:04,551 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2020-08-27 22:00:04,559 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 112. [2020-08-27 22:00:04,560 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2020-08-27 22:00:04,560 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 146 transitions. [2020-08-27 22:00:04,560 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 146 transitions. Word has length 108 [2020-08-27 22:00:04,561 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-27 22:00:04,561 INFO L479 AbstractCegarLoop]: Abstraction has 112 states and 146 transitions. [2020-08-27 22:00:04,561 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-27 22:00:04,561 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 146 transitions. [2020-08-27 22:00:04,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2020-08-27 22:00:04,562 INFO L414 BasicCegarLoop]: Found error trace [2020-08-27 22:00:04,562 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-27 22:00:04,562 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-27 22:00:04,562 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-27 22:00:04,563 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-27 22:00:04,563 INFO L82 PathProgramCache]: Analyzing trace with hash -785639127, now seen corresponding path program 33 times [2020-08-27 22:00:04,563 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-27 22:00:04,563 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1752116706] [2020-08-27 22:00:04,563 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-27 22:00:04,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 22:00:05,712 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-27 22:00:05,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 22:00:05,739 INFO L134 CoverageAnalysis]: Checked inductivity of 1683 backedges. 0 proven. 1683 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-27 22:00:05,746 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1752116706] [2020-08-27 22:00:05,746 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-27 22:00:05,747 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-27 22:00:05,747 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1247886611] [2020-08-27 22:00:05,748 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-27 22:00:05,748 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-27 22:00:05,748 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-27 22:00:05,749 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=1333, Unknown=0, NotChecked=0, Total=1406 [2020-08-27 22:00:05,749 INFO L87 Difference]: Start difference. First operand 112 states and 146 transitions. Second operand 38 states. [2020-08-27 22:00:07,874 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-27 22:00:07,874 INFO L93 Difference]: Finished difference Result 120 states and 155 transitions. [2020-08-27 22:00:07,874 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-27 22:00:07,875 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 111 [2020-08-27 22:00:07,875 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-27 22:00:07,876 INFO L225 Difference]: With dead ends: 120 [2020-08-27 22:00:07,876 INFO L226 Difference]: Without dead ends: 115 [2020-08-27 22:00:07,877 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=77, Invalid=1405, Unknown=0, NotChecked=0, Total=1482 [2020-08-27 22:00:07,878 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2020-08-27 22:00:07,888 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 115. [2020-08-27 22:00:07,888 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2020-08-27 22:00:07,889 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 150 transitions. [2020-08-27 22:00:07,889 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 150 transitions. Word has length 111 [2020-08-27 22:00:07,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-27 22:00:07,890 INFO L479 AbstractCegarLoop]: Abstraction has 115 states and 150 transitions. [2020-08-27 22:00:07,890 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-27 22:00:07,890 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 150 transitions. [2020-08-27 22:00:07,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2020-08-27 22:00:07,891 INFO L414 BasicCegarLoop]: Found error trace [2020-08-27 22:00:07,891 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-27 22:00:07,891 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-27 22:00:07,891 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-27 22:00:07,891 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-27 22:00:07,892 INFO L82 PathProgramCache]: Analyzing trace with hash 2124146962, now seen corresponding path program 34 times [2020-08-27 22:00:07,892 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-27 22:00:07,892 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2095161109] [2020-08-27 22:00:07,892 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-27 22:00:07,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 22:00:09,162 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-27 22:00:09,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 22:00:09,182 INFO L134 CoverageAnalysis]: Checked inductivity of 1785 backedges. 0 proven. 1785 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-27 22:00:09,182 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2095161109] [2020-08-27 22:00:09,182 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-27 22:00:09,182 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-27 22:00:09,182 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [553120260] [2020-08-27 22:00:09,183 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-27 22:00:09,183 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-27 22:00:09,183 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-27 22:00:09,183 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=1407, Unknown=0, NotChecked=0, Total=1482 [2020-08-27 22:00:09,183 INFO L87 Difference]: Start difference. First operand 115 states and 150 transitions. Second operand 39 states. [2020-08-27 22:00:11,417 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-27 22:00:11,418 INFO L93 Difference]: Finished difference Result 123 states and 159 transitions. [2020-08-27 22:00:11,418 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-27 22:00:11,418 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 114 [2020-08-27 22:00:11,419 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-27 22:00:11,419 INFO L225 Difference]: With dead ends: 123 [2020-08-27 22:00:11,420 INFO L226 Difference]: Without dead ends: 118 [2020-08-27 22:00:11,420 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=79, Invalid=1481, Unknown=0, NotChecked=0, Total=1560 [2020-08-27 22:00:11,421 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-08-27 22:00:11,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 118. [2020-08-27 22:00:11,429 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 118 states. [2020-08-27 22:00:11,429 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 154 transitions. [2020-08-27 22:00:11,429 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 154 transitions. Word has length 114 [2020-08-27 22:00:11,430 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-27 22:00:11,430 INFO L479 AbstractCegarLoop]: Abstraction has 118 states and 154 transitions. [2020-08-27 22:00:11,430 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-27 22:00:11,430 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 154 transitions. [2020-08-27 22:00:11,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-08-27 22:00:11,431 INFO L414 BasicCegarLoop]: Found error trace [2020-08-27 22:00:11,431 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-27 22:00:11,431 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-27 22:00:11,431 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-27 22:00:11,431 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-27 22:00:11,432 INFO L82 PathProgramCache]: Analyzing trace with hash -2058378103, now seen corresponding path program 35 times [2020-08-27 22:00:11,432 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-27 22:00:11,432 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2042106513] [2020-08-27 22:00:11,432 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-27 22:00:11,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 22:00:12,696 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-27 22:00:12,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 22:00:12,722 INFO L134 CoverageAnalysis]: Checked inductivity of 1890 backedges. 0 proven. 1890 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-27 22:00:12,722 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2042106513] [2020-08-27 22:00:12,723 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-27 22:00:12,723 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-27 22:00:12,723 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1439986355] [2020-08-27 22:00:12,724 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-27 22:00:12,724 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-27 22:00:12,724 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-27 22:00:12,725 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=1483, Unknown=0, NotChecked=0, Total=1560 [2020-08-27 22:00:12,725 INFO L87 Difference]: Start difference. First operand 118 states and 154 transitions. Second operand 40 states. [2020-08-27 22:00:15,032 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-27 22:00:15,033 INFO L93 Difference]: Finished difference Result 126 states and 163 transitions. [2020-08-27 22:00:15,033 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-27 22:00:15,034 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 117 [2020-08-27 22:00:15,034 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-27 22:00:15,035 INFO L225 Difference]: With dead ends: 126 [2020-08-27 22:00:15,036 INFO L226 Difference]: Without dead ends: 121 [2020-08-27 22:00:15,037 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=81, Invalid=1559, Unknown=0, NotChecked=0, Total=1640 [2020-08-27 22:00:15,037 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2020-08-27 22:00:15,046 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 121. [2020-08-27 22:00:15,047 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 121 states. [2020-08-27 22:00:15,047 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 158 transitions. [2020-08-27 22:00:15,048 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 158 transitions. Word has length 117 [2020-08-27 22:00:15,048 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-27 22:00:15,048 INFO L479 AbstractCegarLoop]: Abstraction has 121 states and 158 transitions. [2020-08-27 22:00:15,048 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-27 22:00:15,048 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 158 transitions. [2020-08-27 22:00:15,049 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2020-08-27 22:00:15,049 INFO L414 BasicCegarLoop]: Found error trace [2020-08-27 22:00:15,049 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-27 22:00:15,049 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-27 22:00:15,049 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-27 22:00:15,050 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-27 22:00:15,050 INFO L82 PathProgramCache]: Analyzing trace with hash 1928602034, now seen corresponding path program 36 times [2020-08-27 22:00:15,050 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-27 22:00:15,050 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [493185789] [2020-08-27 22:00:15,050 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-27 22:00:15,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 22:00:16,447 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-27 22:00:16,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 22:00:16,470 INFO L134 CoverageAnalysis]: Checked inductivity of 1998 backedges. 0 proven. 1998 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-27 22:00:16,470 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [493185789] [2020-08-27 22:00:16,470 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-27 22:00:16,470 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-27 22:00:16,471 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1162668456] [2020-08-27 22:00:16,471 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-27 22:00:16,471 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-27 22:00:16,471 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-27 22:00:16,472 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=1561, Unknown=0, NotChecked=0, Total=1640 [2020-08-27 22:00:16,472 INFO L87 Difference]: Start difference. First operand 121 states and 158 transitions. Second operand 41 states. [2020-08-27 22:00:19,004 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-27 22:00:19,005 INFO L93 Difference]: Finished difference Result 129 states and 167 transitions. [2020-08-27 22:00:19,005 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-27 22:00:19,006 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 120 [2020-08-27 22:00:19,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-27 22:00:19,008 INFO L225 Difference]: With dead ends: 129 [2020-08-27 22:00:19,008 INFO L226 Difference]: Without dead ends: 124 [2020-08-27 22:00:19,009 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=83, Invalid=1639, Unknown=0, NotChecked=0, Total=1722 [2020-08-27 22:00:19,009 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2020-08-27 22:00:19,020 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 124. [2020-08-27 22:00:19,020 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 124 states. [2020-08-27 22:00:19,021 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 162 transitions. [2020-08-27 22:00:19,021 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 162 transitions. Word has length 120 [2020-08-27 22:00:19,022 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-27 22:00:19,022 INFO L479 AbstractCegarLoop]: Abstraction has 124 states and 162 transitions. [2020-08-27 22:00:19,022 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-27 22:00:19,022 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 162 transitions. [2020-08-27 22:00:19,023 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2020-08-27 22:00:19,023 INFO L414 BasicCegarLoop]: Found error trace [2020-08-27 22:00:19,023 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-27 22:00:19,023 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-27 22:00:19,023 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-27 22:00:19,024 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-27 22:00:19,024 INFO L82 PathProgramCache]: Analyzing trace with hash 733292521, now seen corresponding path program 37 times [2020-08-27 22:00:19,024 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-27 22:00:19,024 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1384552788] [2020-08-27 22:00:19,024 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-27 22:00:19,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 22:00:20,527 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-27 22:00:20,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-27 22:00:20,550 INFO L134 CoverageAnalysis]: Checked inductivity of 2109 backedges. 0 proven. 2109 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-27 22:00:20,551 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1384552788] [2020-08-27 22:00:20,551 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-27 22:00:20,551 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-27 22:00:20,551 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1192815059] [2020-08-27 22:00:20,552 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-27 22:00:20,552 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-27 22:00:20,552 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-27 22:00:20,553 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=1641, Unknown=0, NotChecked=0, Total=1722 [2020-08-27 22:00:20,553 INFO L87 Difference]: Start difference. First operand 124 states and 162 transitions. Second operand 42 states.