/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=DEEPEST --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/simple_4-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 20:41:27,461 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 20:41:27,464 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 20:41:27,505 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 20:41:27,505 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 20:41:27,515 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 20:41:27,517 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 20:41:27,520 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 20:41:27,523 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 20:41:27,529 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 20:41:27,530 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 20:41:27,530 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 20:41:27,531 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 20:41:27,532 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 20:41:27,532 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 20:41:27,533 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 20:41:27,534 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 20:41:27,535 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 20:41:27,536 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 20:41:27,538 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 20:41:27,540 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 20:41:27,541 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 20:41:27,542 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 20:41:27,542 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 20:41:27,545 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-21 20:41:27,545 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-21 20:41:27,545 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-21 20:41:27,546 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-21 20:41:27,546 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-21 20:41:27,547 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... 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[2020-08-21 20:41:27,552 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 20:41:27,553 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 20:41:27,553 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 20:41:27,554 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-21 20:41:27,586 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 20:41:27,587 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 20:41:27,588 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 20:41:27,588 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 20:41:27,588 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 20:41:27,589 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 20:41:27,589 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 20:41:27,589 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 20:41:27,590 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 20:41:27,590 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 20:41:27,590 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 20:41:27,590 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 20:41:27,590 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 20:41:27,590 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 20:41:27,591 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 20:41:27,591 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 20:41:27,591 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 20:41:27,591 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 20:41:27,591 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 20:41:27,593 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 20:41:27,594 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 20:41:27,594 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 20:41:27,594 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 20:41:27,594 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 20:41:27,595 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 20:41:27,595 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 20:41:27,595 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 20:41:27,595 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 20:41:27,595 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 20:41:27,596 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=DEEPEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=DEEPEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=DEEPEST;log-additional-information=true; [2020-08-21 20:41:27,899 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 20:41:27,911 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 20:41:27,914 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 20:41:27,915 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 20:41:27,916 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 20:41:27,917 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/simple_4-2.c [2020-08-21 20:41:27,977 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/4d74a50f6/f4c181433a2d4c48a83ca5d0f456dcb1/FLAGefb474f3c [2020-08-21 20:41:28,405 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 20:41:28,405 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-acceleration/simple_4-2.c [2020-08-21 20:41:28,411 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/4d74a50f6/f4c181433a2d4c48a83ca5d0f456dcb1/FLAGefb474f3c [2020-08-21 20:41:28,793 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/4d74a50f6/f4c181433a2d4c48a83ca5d0f456dcb1 [2020-08-21 20:41:28,806 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 20:41:28,808 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 20:41:28,809 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 20:41:28,809 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 20:41:28,814 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 20:41:28,815 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 08:41:28" (1/1) ... [2020-08-21 20:41:28,818 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4137acd4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:41:28, skipping insertion in model container [2020-08-21 20:41:28,818 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 08:41:28" (1/1) ... [2020-08-21 20:41:28,826 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 20:41:28,843 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 20:41:29,016 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 20:41:29,021 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 20:41:29,035 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 20:41:29,049 INFO L208 MainTranslator]: Completed translation [2020-08-21 20:41:29,050 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:41:29 WrapperNode [2020-08-21 20:41:29,050 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 20:41:29,051 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 20:41:29,051 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 20:41:29,051 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 20:41:29,062 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:41:29" (1/1) ... [2020-08-21 20:41:29,063 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:41:29" (1/1) ... [2020-08-21 20:41:29,067 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:41:29" (1/1) ... [2020-08-21 20:41:29,067 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:41:29" (1/1) ... [2020-08-21 20:41:29,150 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:41:29" (1/1) ... [2020-08-21 20:41:29,156 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:41:29" (1/1) ... [2020-08-21 20:41:29,156 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:41:29" (1/1) ... [2020-08-21 20:41:29,158 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 20:41:29,159 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 20:41:29,159 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 20:41:29,159 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 20:41:29,160 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:41:29" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 20:41:29,215 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 20:41:29,215 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 20:41:29,215 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-21 20:41:29,216 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 20:41:29,216 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 20:41:29,216 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-21 20:41:29,216 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 20:41:29,217 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 20:41:29,217 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 20:41:29,365 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 20:41:29,365 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-21 20:41:29,369 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 08:41:29 BoogieIcfgContainer [2020-08-21 20:41:29,369 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 20:41:29,370 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 20:41:29,370 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 20:41:29,373 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 20:41:29,374 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 08:41:28" (1/3) ... [2020-08-21 20:41:29,374 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2a059b42 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 08:41:29, skipping insertion in model container [2020-08-21 20:41:29,375 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:41:29" (2/3) ... [2020-08-21 20:41:29,375 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2a059b42 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 08:41:29, skipping insertion in model container [2020-08-21 20:41:29,375 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 08:41:29" (3/3) ... [2020-08-21 20:41:29,377 INFO L109 eAbstractionObserver]: Analyzing ICFG simple_4-2.c [2020-08-21 20:41:29,387 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 20:41:29,394 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 20:41:29,407 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 20:41:29,427 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 20:41:29,428 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 20:41:29,428 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 20:41:29,428 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 20:41:29,428 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 20:41:29,428 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 20:41:29,428 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 20:41:29,429 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 20:41:29,446 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2020-08-21 20:41:29,450 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-21 20:41:29,451 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:29,452 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:29,452 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:29,457 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:29,457 INFO L82 PathProgramCache]: Analyzing trace with hash 1846144830, now seen corresponding path program 1 times [2020-08-21 20:41:29,464 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:29,464 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1812506] [2020-08-21 20:41:29,464 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:29,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:29,806 WARN L193 SmtUtils]: Spent 196.00 ms on a formula simplification. DAG size of input: 12 DAG size of output: 8 [2020-08-21 20:41:29,808 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:29,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:29,819 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:29,821 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1812506] [2020-08-21 20:41:29,824 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 20:41:29,824 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 20:41:29,826 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [10606782] [2020-08-21 20:41:29,831 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 20:41:29,832 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:29,848 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 20:41:29,849 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 20:41:29,852 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 3 states. [2020-08-21 20:41:29,883 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:29,883 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-08-21 20:41:29,884 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 20:41:29,885 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-08-21 20:41:29,886 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:29,894 INFO L225 Difference]: With dead ends: 29 [2020-08-21 20:41:29,895 INFO L226 Difference]: Without dead ends: 12 [2020-08-21 20:41:29,898 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 20:41:29,915 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-08-21 20:41:29,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-08-21 20:41:29,930 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-08-21 20:41:29,931 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2020-08-21 20:41:29,932 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2020-08-21 20:41:29,932 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:29,933 INFO L479 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2020-08-21 20:41:29,933 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 20:41:29,933 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2020-08-21 20:41:29,934 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-08-21 20:41:29,934 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:29,934 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:29,934 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 20:41:29,935 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:29,935 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:29,935 INFO L82 PathProgramCache]: Analyzing trace with hash 1432376145, now seen corresponding path program 1 times [2020-08-21 20:41:29,935 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:29,936 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1788068264] [2020-08-21 20:41:29,936 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:29,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:30,033 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:30,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:30,037 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:30,038 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1788068264] [2020-08-21 20:41:30,038 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:30,038 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-08-21 20:41:30,038 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1181555016] [2020-08-21 20:41:30,040 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 20:41:30,041 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:30,041 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 20:41:30,041 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-21 20:41:30,042 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 4 states. [2020-08-21 20:41:30,067 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:30,068 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2020-08-21 20:41:30,068 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 20:41:30,068 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 11 [2020-08-21 20:41:30,069 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:30,069 INFO L225 Difference]: With dead ends: 18 [2020-08-21 20:41:30,070 INFO L226 Difference]: Without dead ends: 13 [2020-08-21 20:41:30,071 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-21 20:41:30,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-08-21 20:41:30,074 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-08-21 20:41:30,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-08-21 20:41:30,075 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2020-08-21 20:41:30,075 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2020-08-21 20:41:30,076 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:30,076 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2020-08-21 20:41:30,076 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 20:41:30,076 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2020-08-21 20:41:30,077 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-21 20:41:30,077 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:30,077 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:30,077 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 20:41:30,078 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:30,078 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:30,078 INFO L82 PathProgramCache]: Analyzing trace with hash 1490448798, now seen corresponding path program 2 times [2020-08-21 20:41:30,079 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:30,079 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [85558656] [2020-08-21 20:41:30,079 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:30,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:30,178 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:30,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:30,182 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:30,183 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [85558656] [2020-08-21 20:41:30,183 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:30,183 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-21 20:41:30,183 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1856649050] [2020-08-21 20:41:30,184 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 20:41:30,184 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:30,185 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 20:41:30,185 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-21 20:41:30,185 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 5 states. [2020-08-21 20:41:30,209 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:30,209 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2020-08-21 20:41:30,210 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 20:41:30,210 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2020-08-21 20:41:30,210 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:30,211 INFO L225 Difference]: With dead ends: 19 [2020-08-21 20:41:30,212 INFO L226 Difference]: Without dead ends: 14 [2020-08-21 20:41:30,212 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-21 20:41:30,213 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-08-21 20:41:30,216 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-08-21 20:41:30,217 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-08-21 20:41:30,218 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-08-21 20:41:30,218 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-08-21 20:41:30,218 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:30,218 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-08-21 20:41:30,218 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 20:41:30,219 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-08-21 20:41:30,219 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-21 20:41:30,219 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:30,220 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:30,220 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 20:41:30,220 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:30,220 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:30,221 INFO L82 PathProgramCache]: Analyzing trace with hash -1004266255, now seen corresponding path program 3 times [2020-08-21 20:41:30,221 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:30,221 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [966071167] [2020-08-21 20:41:30,222 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:30,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:30,332 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:30,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:30,338 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:30,339 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [966071167] [2020-08-21 20:41:30,339 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:30,340 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 20:41:30,340 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1228004394] [2020-08-21 20:41:30,340 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 20:41:30,341 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:30,341 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 20:41:30,341 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-21 20:41:30,341 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 6 states. [2020-08-21 20:41:30,373 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:30,373 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2020-08-21 20:41:30,373 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 20:41:30,374 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 13 [2020-08-21 20:41:30,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:30,374 INFO L225 Difference]: With dead ends: 20 [2020-08-21 20:41:30,375 INFO L226 Difference]: Without dead ends: 15 [2020-08-21 20:41:30,375 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-21 20:41:30,376 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-21 20:41:30,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-21 20:41:30,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-21 20:41:30,380 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-08-21 20:41:30,380 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2020-08-21 20:41:30,381 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:30,381 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-08-21 20:41:30,381 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 20:41:30,381 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-08-21 20:41:30,382 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-21 20:41:30,382 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:30,382 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:30,382 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 20:41:30,382 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:30,383 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:30,383 INFO L82 PathProgramCache]: Analyzing trace with hash -1031021570, now seen corresponding path program 4 times [2020-08-21 20:41:30,383 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:30,383 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1945890346] [2020-08-21 20:41:30,384 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:30,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:30,496 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:30,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:30,499 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:30,500 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1945890346] [2020-08-21 20:41:30,500 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:30,500 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 20:41:30,501 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [635509856] [2020-08-21 20:41:30,501 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 20:41:30,502 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:30,502 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 20:41:30,502 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-21 20:41:30,502 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 7 states. [2020-08-21 20:41:30,542 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:30,542 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2020-08-21 20:41:30,543 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 20:41:30,543 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 14 [2020-08-21 20:41:30,544 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:30,544 INFO L225 Difference]: With dead ends: 21 [2020-08-21 20:41:30,545 INFO L226 Difference]: Without dead ends: 16 [2020-08-21 20:41:30,545 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-21 20:41:30,546 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-21 20:41:30,550 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-21 20:41:30,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-21 20:41:30,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2020-08-21 20:41:30,551 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2020-08-21 20:41:30,552 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:30,552 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2020-08-21 20:41:30,552 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 20:41:30,552 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2020-08-21 20:41:30,553 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-21 20:41:30,553 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:30,553 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:30,554 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 20:41:30,554 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:30,554 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:30,554 INFO L82 PathProgramCache]: Analyzing trace with hash -1860436335, now seen corresponding path program 5 times [2020-08-21 20:41:30,555 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:30,555 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [620003827] [2020-08-21 20:41:30,555 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:30,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:30,732 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:30,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:30,738 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:30,738 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [620003827] [2020-08-21 20:41:30,741 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:30,741 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 20:41:30,742 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2141857245] [2020-08-21 20:41:30,742 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 20:41:30,742 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:30,743 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 20:41:30,743 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-08-21 20:41:30,743 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 8 states. [2020-08-21 20:41:30,806 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:30,806 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2020-08-21 20:41:30,809 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 20:41:30,809 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 15 [2020-08-21 20:41:30,810 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:30,810 INFO L225 Difference]: With dead ends: 22 [2020-08-21 20:41:30,810 INFO L226 Difference]: Without dead ends: 17 [2020-08-21 20:41:30,812 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-08-21 20:41:30,812 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-21 20:41:30,816 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-21 20:41:30,817 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-21 20:41:30,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-21 20:41:30,819 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2020-08-21 20:41:30,819 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:30,826 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-21 20:41:30,826 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 20:41:30,827 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-21 20:41:30,827 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-21 20:41:30,827 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:30,827 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:30,828 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 20:41:30,828 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:30,828 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:30,828 INFO L82 PathProgramCache]: Analyzing trace with hash -1802490274, now seen corresponding path program 6 times [2020-08-21 20:41:30,830 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:30,830 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [184286891] [2020-08-21 20:41:30,830 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:30,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:31,026 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:31,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:31,029 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:31,032 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [184286891] [2020-08-21 20:41:31,032 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:31,033 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 20:41:31,033 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [164980333] [2020-08-21 20:41:31,033 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 20:41:31,034 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:31,034 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 20:41:31,034 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-21 20:41:31,034 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 9 states. [2020-08-21 20:41:31,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:31,099 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2020-08-21 20:41:31,101 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 20:41:31,101 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 16 [2020-08-21 20:41:31,102 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:31,102 INFO L225 Difference]: With dead ends: 23 [2020-08-21 20:41:31,102 INFO L226 Difference]: Without dead ends: 18 [2020-08-21 20:41:31,105 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-21 20:41:31,105 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-21 20:41:31,111 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-08-21 20:41:31,112 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-21 20:41:31,112 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2020-08-21 20:41:31,113 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 16 [2020-08-21 20:41:31,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:31,113 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2020-08-21 20:41:31,114 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 20:41:31,114 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2020-08-21 20:41:31,114 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-21 20:41:31,115 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:31,115 INFO L422 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:31,115 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 20:41:31,115 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:31,116 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:31,116 INFO L82 PathProgramCache]: Analyzing trace with hash -6162383, now seen corresponding path program 7 times [2020-08-21 20:41:31,116 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:31,117 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [772302649] [2020-08-21 20:41:31,117 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:31,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:31,314 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:31,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:31,321 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:31,321 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [772302649] [2020-08-21 20:41:31,321 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:31,322 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 20:41:31,322 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [438949333] [2020-08-21 20:41:31,323 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 20:41:31,323 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:31,323 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 20:41:31,324 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-08-21 20:41:31,325 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 10 states. [2020-08-21 20:41:31,401 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:31,401 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2020-08-21 20:41:31,403 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 20:41:31,404 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 17 [2020-08-21 20:41:31,404 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:31,404 INFO L225 Difference]: With dead ends: 24 [2020-08-21 20:41:31,405 INFO L226 Difference]: Without dead ends: 19 [2020-08-21 20:41:31,405 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-08-21 20:41:31,407 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-08-21 20:41:31,411 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-08-21 20:41:31,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-21 20:41:31,414 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2020-08-21 20:41:31,414 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 17 [2020-08-21 20:41:31,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:31,414 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2020-08-21 20:41:31,415 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 20:41:31,417 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2020-08-21 20:41:31,418 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-21 20:41:31,418 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:31,418 INFO L422 BasicCegarLoop]: trace histogram [8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:31,419 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 20:41:31,419 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:31,419 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:31,419 INFO L82 PathProgramCache]: Analyzing trace with hash -154572610, now seen corresponding path program 8 times [2020-08-21 20:41:31,420 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:31,421 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1322841919] [2020-08-21 20:41:31,422 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:31,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:31,593 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:31,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:31,597 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:31,598 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1322841919] [2020-08-21 20:41:31,600 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:31,600 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 20:41:31,600 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [83274961] [2020-08-21 20:41:31,601 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 20:41:31,601 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:31,602 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 20:41:31,602 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-08-21 20:41:31,602 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 11 states. [2020-08-21 20:41:31,689 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:31,689 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2020-08-21 20:41:31,690 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 20:41:31,690 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 18 [2020-08-21 20:41:31,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:31,691 INFO L225 Difference]: With dead ends: 25 [2020-08-21 20:41:31,691 INFO L226 Difference]: Without dead ends: 20 [2020-08-21 20:41:31,692 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-08-21 20:41:31,692 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-21 20:41:31,699 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-21 20:41:31,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-21 20:41:31,705 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2020-08-21 20:41:31,706 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 18 [2020-08-21 20:41:31,706 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:31,706 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2020-08-21 20:41:31,707 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 20:41:31,708 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2020-08-21 20:41:31,708 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-21 20:41:31,708 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:31,709 INFO L422 BasicCegarLoop]: trace histogram [9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:31,709 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 20:41:31,709 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:31,710 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:31,710 INFO L82 PathProgramCache]: Analyzing trace with hash -460322351, now seen corresponding path program 9 times [2020-08-21 20:41:31,710 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:31,710 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1242142867] [2020-08-21 20:41:31,710 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:31,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:31,916 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:31,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:31,921 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:31,922 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1242142867] [2020-08-21 20:41:31,922 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:31,922 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 20:41:31,923 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1176142538] [2020-08-21 20:41:31,923 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 20:41:31,924 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:31,924 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 20:41:31,924 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-08-21 20:41:31,924 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 12 states. [2020-08-21 20:41:32,023 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:32,023 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-08-21 20:41:32,024 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 20:41:32,024 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 19 [2020-08-21 20:41:32,025 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:32,025 INFO L225 Difference]: With dead ends: 26 [2020-08-21 20:41:32,025 INFO L226 Difference]: Without dead ends: 21 [2020-08-21 20:41:32,026 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-08-21 20:41:32,027 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-21 20:41:32,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-21 20:41:32,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-21 20:41:32,032 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2020-08-21 20:41:32,033 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 19 [2020-08-21 20:41:32,033 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:32,033 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2020-08-21 20:41:32,033 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 20:41:32,033 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2020-08-21 20:41:32,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-21 20:41:32,034 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:32,034 INFO L422 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:32,034 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 20:41:32,035 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:32,035 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:32,035 INFO L82 PathProgramCache]: Analyzing trace with hash -1348629730, now seen corresponding path program 10 times [2020-08-21 20:41:32,035 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:32,035 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1016894737] [2020-08-21 20:41:32,036 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:32,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:32,249 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:32,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:32,251 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:32,252 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1016894737] [2020-08-21 20:41:32,252 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:32,252 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 20:41:32,252 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [548528078] [2020-08-21 20:41:32,254 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 20:41:32,254 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:32,254 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 20:41:32,255 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-08-21 20:41:32,255 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 13 states. [2020-08-21 20:41:32,381 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:32,382 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2020-08-21 20:41:32,383 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 20:41:32,383 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 20 [2020-08-21 20:41:32,384 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:32,384 INFO L225 Difference]: With dead ends: 27 [2020-08-21 20:41:32,384 INFO L226 Difference]: Without dead ends: 22 [2020-08-21 20:41:32,387 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-08-21 20:41:32,388 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-21 20:41:32,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-08-21 20:41:32,393 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-21 20:41:32,394 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2020-08-21 20:41:32,394 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 20 [2020-08-21 20:41:32,394 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:32,394 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2020-08-21 20:41:32,395 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 20:41:32,395 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2020-08-21 20:41:32,395 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-21 20:41:32,395 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:32,395 INFO L422 BasicCegarLoop]: trace histogram [11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:32,397 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 20:41:32,398 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:32,398 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:32,398 INFO L82 PathProgramCache]: Analyzing trace with hash 1178612593, now seen corresponding path program 11 times [2020-08-21 20:41:32,398 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:32,399 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [343716119] [2020-08-21 20:41:32,399 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:32,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:32,599 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:32,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:32,604 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:32,605 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [343716119] [2020-08-21 20:41:32,605 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:32,605 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-21 20:41:32,605 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [326368577] [2020-08-21 20:41:32,606 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-21 20:41:32,606 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:32,606 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-21 20:41:32,607 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-08-21 20:41:32,607 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 14 states. [2020-08-21 20:41:32,708 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:32,708 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2020-08-21 20:41:32,709 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-21 20:41:32,709 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 21 [2020-08-21 20:41:32,709 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:32,710 INFO L225 Difference]: With dead ends: 28 [2020-08-21 20:41:32,710 INFO L226 Difference]: Without dead ends: 23 [2020-08-21 20:41:32,711 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-08-21 20:41:32,711 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-21 20:41:32,715 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-08-21 20:41:32,715 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-21 20:41:32,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-08-21 20:41:32,716 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 21 [2020-08-21 20:41:32,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:32,716 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-08-21 20:41:32,716 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-21 20:41:32,716 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-08-21 20:41:32,717 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-21 20:41:32,717 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:32,717 INFO L422 BasicCegarLoop]: trace histogram [12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:32,718 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 20:41:32,718 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:32,718 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:32,718 INFO L82 PathProgramCache]: Analyzing trace with hash -2081254018, now seen corresponding path program 12 times [2020-08-21 20:41:32,719 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:32,719 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [512768966] [2020-08-21 20:41:32,719 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:32,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:32,936 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:32,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:32,939 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:32,940 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [512768966] [2020-08-21 20:41:32,940 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:32,940 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-21 20:41:32,941 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [282522455] [2020-08-21 20:41:32,941 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-21 20:41:32,941 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:32,941 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-21 20:41:32,942 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-08-21 20:41:32,942 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 15 states. [2020-08-21 20:41:33,081 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:33,081 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2020-08-21 20:41:33,082 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-21 20:41:33,082 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 22 [2020-08-21 20:41:33,082 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:33,083 INFO L225 Difference]: With dead ends: 29 [2020-08-21 20:41:33,083 INFO L226 Difference]: Without dead ends: 24 [2020-08-21 20:41:33,083 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-08-21 20:41:33,086 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-21 20:41:33,092 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-08-21 20:41:33,094 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-21 20:41:33,095 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2020-08-21 20:41:33,095 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 22 [2020-08-21 20:41:33,095 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:33,095 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2020-08-21 20:41:33,095 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-21 20:41:33,096 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2020-08-21 20:41:33,098 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-08-21 20:41:33,098 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:33,098 INFO L422 BasicCegarLoop]: trace histogram [13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:33,098 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 20:41:33,098 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:33,098 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:33,099 INFO L82 PathProgramCache]: Analyzing trace with hash -57903855, now seen corresponding path program 13 times [2020-08-21 20:41:33,099 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:33,099 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1683726219] [2020-08-21 20:41:33,100 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:33,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:33,357 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:33,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:33,361 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:33,361 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1683726219] [2020-08-21 20:41:33,362 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:33,362 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-21 20:41:33,363 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1127433223] [2020-08-21 20:41:33,363 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-21 20:41:33,364 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:33,364 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-21 20:41:33,365 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2020-08-21 20:41:33,365 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 16 states. [2020-08-21 20:41:33,501 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:33,501 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2020-08-21 20:41:33,503 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-21 20:41:33,503 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 23 [2020-08-21 20:41:33,503 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:33,503 INFO L225 Difference]: With dead ends: 30 [2020-08-21 20:41:33,504 INFO L226 Difference]: Without dead ends: 25 [2020-08-21 20:41:33,504 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2020-08-21 20:41:33,505 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-21 20:41:33,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-08-21 20:41:33,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-21 20:41:33,515 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2020-08-21 20:41:33,515 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 23 [2020-08-21 20:41:33,516 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:33,516 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2020-08-21 20:41:33,516 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-21 20:41:33,516 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2020-08-21 20:41:33,517 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-21 20:41:33,517 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:33,517 INFO L422 BasicCegarLoop]: trace histogram [14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:33,518 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-21 20:41:33,518 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:33,518 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:33,518 INFO L82 PathProgramCache]: Analyzing trace with hash -1758558242, now seen corresponding path program 14 times [2020-08-21 20:41:33,518 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:33,518 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [968423553] [2020-08-21 20:41:33,519 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:33,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:33,863 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:33,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:33,865 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:33,866 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [968423553] [2020-08-21 20:41:33,866 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:33,866 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-21 20:41:33,866 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [572478660] [2020-08-21 20:41:33,867 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-21 20:41:33,867 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:33,867 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-21 20:41:33,868 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-08-21 20:41:33,868 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 17 states. [2020-08-21 20:41:34,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:34,069 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2020-08-21 20:41:34,070 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-21 20:41:34,070 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 24 [2020-08-21 20:41:34,071 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:34,071 INFO L225 Difference]: With dead ends: 31 [2020-08-21 20:41:34,071 INFO L226 Difference]: Without dead ends: 26 [2020-08-21 20:41:34,072 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-08-21 20:41:34,072 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-21 20:41:34,078 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-08-21 20:41:34,078 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-21 20:41:34,079 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2020-08-21 20:41:34,079 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 24 [2020-08-21 20:41:34,081 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:34,081 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2020-08-21 20:41:34,082 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-21 20:41:34,082 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2020-08-21 20:41:34,084 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-21 20:41:34,085 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:34,085 INFO L422 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:34,085 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-21 20:41:34,085 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:34,085 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:34,086 INFO L82 PathProgramCache]: Analyzing trace with hash 1355730609, now seen corresponding path program 15 times [2020-08-21 20:41:34,086 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:34,086 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [805195442] [2020-08-21 20:41:34,086 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:34,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:34,357 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:34,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:34,362 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:34,362 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [805195442] [2020-08-21 20:41:34,362 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:34,362 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-21 20:41:34,363 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [406648705] [2020-08-21 20:41:34,363 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-21 20:41:34,363 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:34,364 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-21 20:41:34,364 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2020-08-21 20:41:34,364 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 18 states. [2020-08-21 20:41:34,551 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:34,551 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-08-21 20:41:34,551 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-21 20:41:34,551 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 25 [2020-08-21 20:41:34,552 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:34,552 INFO L225 Difference]: With dead ends: 32 [2020-08-21 20:41:34,552 INFO L226 Difference]: Without dead ends: 27 [2020-08-21 20:41:34,553 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2020-08-21 20:41:34,554 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-08-21 20:41:34,558 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-08-21 20:41:34,558 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-21 20:41:34,559 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2020-08-21 20:41:34,559 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 25 [2020-08-21 20:41:34,560 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:34,560 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2020-08-21 20:41:34,560 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-21 20:41:34,560 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2020-08-21 20:41:34,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-21 20:41:34,563 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:34,563 INFO L422 BasicCegarLoop]: trace histogram [16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:34,563 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-21 20:41:34,563 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:34,563 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:34,564 INFO L82 PathProgramCache]: Analyzing trace with hash -885562818, now seen corresponding path program 16 times [2020-08-21 20:41:34,564 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:34,564 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [170139774] [2020-08-21 20:41:34,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:34,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:34,899 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:34,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:34,903 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:34,903 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [170139774] [2020-08-21 20:41:34,903 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:34,904 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-21 20:41:34,904 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1295655211] [2020-08-21 20:41:34,905 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-21 20:41:34,905 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:34,905 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-21 20:41:34,905 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-08-21 20:41:34,906 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 19 states. [2020-08-21 20:41:35,111 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:35,111 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2020-08-21 20:41:35,113 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-21 20:41:35,114 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 26 [2020-08-21 20:41:35,114 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:35,115 INFO L225 Difference]: With dead ends: 33 [2020-08-21 20:41:35,115 INFO L226 Difference]: Without dead ends: 28 [2020-08-21 20:41:35,115 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-08-21 20:41:35,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-21 20:41:35,123 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-08-21 20:41:35,123 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-21 20:41:35,124 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2020-08-21 20:41:35,124 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 26 [2020-08-21 20:41:35,124 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:35,124 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2020-08-21 20:41:35,124 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-21 20:41:35,125 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2020-08-21 20:41:35,125 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-21 20:41:35,125 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:35,125 INFO L422 BasicCegarLoop]: trace histogram [17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:35,127 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-21 20:41:35,127 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:35,128 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:35,128 INFO L82 PathProgramCache]: Analyzing trace with hash -1646182319, now seen corresponding path program 17 times [2020-08-21 20:41:35,128 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:35,128 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1539058710] [2020-08-21 20:41:35,128 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:35,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:35,495 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:35,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:35,498 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:35,499 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1539058710] [2020-08-21 20:41:35,499 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:35,499 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-21 20:41:35,499 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1347813200] [2020-08-21 20:41:35,500 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-21 20:41:35,500 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:35,500 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-21 20:41:35,501 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2020-08-21 20:41:35,501 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 20 states. [2020-08-21 20:41:35,733 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:35,733 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2020-08-21 20:41:35,733 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-21 20:41:35,734 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 27 [2020-08-21 20:41:35,734 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:35,735 INFO L225 Difference]: With dead ends: 34 [2020-08-21 20:41:35,735 INFO L226 Difference]: Without dead ends: 29 [2020-08-21 20:41:35,735 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2020-08-21 20:41:35,736 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-21 20:41:35,739 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-08-21 20:41:35,740 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-21 20:41:35,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-08-21 20:41:35,740 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 27 [2020-08-21 20:41:35,741 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:35,741 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-08-21 20:41:35,741 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-21 20:41:35,741 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-08-21 20:41:35,742 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-21 20:41:35,742 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:35,742 INFO L422 BasicCegarLoop]: trace histogram [18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:35,742 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-21 20:41:35,742 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:35,742 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:35,743 INFO L82 PathProgramCache]: Analyzing trace with hash 544416926, now seen corresponding path program 18 times [2020-08-21 20:41:35,743 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:35,743 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1662099818] [2020-08-21 20:41:35,743 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:35,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:36,111 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:36,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:36,114 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:36,115 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1662099818] [2020-08-21 20:41:36,115 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:36,115 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-21 20:41:36,115 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [818343027] [2020-08-21 20:41:36,116 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-21 20:41:36,116 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:36,116 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-21 20:41:36,117 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2020-08-21 20:41:36,117 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 21 states. [2020-08-21 20:41:36,367 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:36,368 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2020-08-21 20:41:36,368 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-21 20:41:36,368 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 28 [2020-08-21 20:41:36,369 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:36,369 INFO L225 Difference]: With dead ends: 35 [2020-08-21 20:41:36,369 INFO L226 Difference]: Without dead ends: 30 [2020-08-21 20:41:36,370 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2020-08-21 20:41:36,370 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-21 20:41:36,374 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-08-21 20:41:36,374 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-21 20:41:36,374 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2020-08-21 20:41:36,375 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 28 [2020-08-21 20:41:36,375 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:36,375 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2020-08-21 20:41:36,375 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-21 20:41:36,375 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2020-08-21 20:41:36,376 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-21 20:41:36,376 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:36,376 INFO L422 BasicCegarLoop]: trace histogram [19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:36,376 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-21 20:41:36,377 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:36,377 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:36,377 INFO L82 PathProgramCache]: Analyzing trace with hash -266483215, now seen corresponding path program 19 times [2020-08-21 20:41:36,377 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:36,377 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2076572463] [2020-08-21 20:41:36,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:36,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:36,719 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:36,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:36,722 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:36,722 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2076572463] [2020-08-21 20:41:36,722 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:36,723 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-21 20:41:36,723 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2044773433] [2020-08-21 20:41:36,723 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-21 20:41:36,723 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:36,723 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-21 20:41:36,724 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2020-08-21 20:41:36,724 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 22 states. [2020-08-21 20:41:36,990 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:36,990 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2020-08-21 20:41:36,995 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-21 20:41:36,995 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 29 [2020-08-21 20:41:36,995 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:36,996 INFO L225 Difference]: With dead ends: 36 [2020-08-21 20:41:36,996 INFO L226 Difference]: Without dead ends: 31 [2020-08-21 20:41:36,997 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2020-08-21 20:41:36,997 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-21 20:41:37,004 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-08-21 20:41:37,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-21 20:41:37,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2020-08-21 20:41:37,005 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 29 [2020-08-21 20:41:37,005 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:37,005 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2020-08-21 20:41:37,005 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-21 20:41:37,005 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2020-08-21 20:41:37,007 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-21 20:41:37,007 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:37,007 INFO L422 BasicCegarLoop]: trace histogram [20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:37,007 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-21 20:41:37,007 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:37,008 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:37,008 INFO L82 PathProgramCache]: Analyzing trace with hash 365416190, now seen corresponding path program 20 times [2020-08-21 20:41:37,008 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:37,008 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [159280460] [2020-08-21 20:41:37,009 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:37,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:37,450 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:37,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:37,453 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:37,453 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [159280460] [2020-08-21 20:41:37,453 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:37,454 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-21 20:41:37,454 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [389529821] [2020-08-21 20:41:37,454 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-21 20:41:37,454 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:37,455 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-21 20:41:37,455 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2020-08-21 20:41:37,455 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 23 states. [2020-08-21 20:41:37,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:37,756 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2020-08-21 20:41:37,756 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-21 20:41:37,757 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 30 [2020-08-21 20:41:37,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:37,757 INFO L225 Difference]: With dead ends: 37 [2020-08-21 20:41:37,757 INFO L226 Difference]: Without dead ends: 32 [2020-08-21 20:41:37,758 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2020-08-21 20:41:37,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-21 20:41:37,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-08-21 20:41:37,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-21 20:41:37,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2020-08-21 20:41:37,763 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 30 [2020-08-21 20:41:37,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:37,763 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2020-08-21 20:41:37,763 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-21 20:41:37,763 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2020-08-21 20:41:37,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-21 20:41:37,764 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:37,764 INFO L422 BasicCegarLoop]: trace histogram [21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:37,764 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-21 20:41:37,765 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:37,765 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:37,765 INFO L82 PathProgramCache]: Analyzing trace with hash -1520538735, now seen corresponding path program 21 times [2020-08-21 20:41:37,765 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:37,765 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1824912224] [2020-08-21 20:41:37,766 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:37,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:38,224 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:38,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:38,228 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:38,229 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1824912224] [2020-08-21 20:41:38,229 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:38,229 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-21 20:41:38,230 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [12606016] [2020-08-21 20:41:38,230 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-21 20:41:38,230 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:38,231 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-21 20:41:38,231 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2020-08-21 20:41:38,231 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 24 states. [2020-08-21 20:41:38,497 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:38,497 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-08-21 20:41:38,499 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-21 20:41:38,499 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 31 [2020-08-21 20:41:38,500 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:38,500 INFO L225 Difference]: With dead ends: 38 [2020-08-21 20:41:38,500 INFO L226 Difference]: Without dead ends: 33 [2020-08-21 20:41:38,501 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2020-08-21 20:41:38,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-21 20:41:38,509 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-08-21 20:41:38,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-21 20:41:38,512 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2020-08-21 20:41:38,512 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 31 [2020-08-21 20:41:38,512 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:38,513 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2020-08-21 20:41:38,514 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-21 20:41:38,514 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2020-08-21 20:41:38,515 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-21 20:41:38,515 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:38,515 INFO L422 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:38,515 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-21 20:41:38,516 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:38,516 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:38,516 INFO L82 PathProgramCache]: Analyzing trace with hash 144400734, now seen corresponding path program 22 times [2020-08-21 20:41:38,516 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:38,516 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2104067429] [2020-08-21 20:41:38,517 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:38,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:39,015 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:39,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:39,020 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:39,020 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2104067429] [2020-08-21 20:41:39,020 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:39,021 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-21 20:41:39,021 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1253187126] [2020-08-21 20:41:39,021 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-21 20:41:39,022 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:39,022 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-21 20:41:39,022 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2020-08-21 20:41:39,022 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 25 states. [2020-08-21 20:41:39,355 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:39,355 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2020-08-21 20:41:39,356 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-21 20:41:39,356 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 32 [2020-08-21 20:41:39,356 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:39,357 INFO L225 Difference]: With dead ends: 39 [2020-08-21 20:41:39,357 INFO L226 Difference]: Without dead ends: 34 [2020-08-21 20:41:39,358 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2020-08-21 20:41:39,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-21 20:41:39,368 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-08-21 20:41:39,368 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-21 20:41:39,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2020-08-21 20:41:39,371 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 32 [2020-08-21 20:41:39,371 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:39,371 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2020-08-21 20:41:39,371 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-21 20:41:39,371 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2020-08-21 20:41:39,374 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-21 20:41:39,374 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:39,375 INFO L422 BasicCegarLoop]: trace histogram [23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:39,375 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-21 20:41:39,375 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:39,375 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:39,377 INFO L82 PathProgramCache]: Analyzing trace with hash 217916721, now seen corresponding path program 23 times [2020-08-21 20:41:39,377 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:39,377 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [895368692] [2020-08-21 20:41:39,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:39,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:39,902 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:39,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:39,906 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:39,907 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [895368692] [2020-08-21 20:41:39,907 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:39,907 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-21 20:41:39,907 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [673735695] [2020-08-21 20:41:39,908 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-21 20:41:39,908 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:39,908 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-21 20:41:39,908 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2020-08-21 20:41:39,908 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 26 states. [2020-08-21 20:41:40,305 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:40,306 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2020-08-21 20:41:40,306 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-21 20:41:40,306 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 33 [2020-08-21 20:41:40,307 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:40,307 INFO L225 Difference]: With dead ends: 40 [2020-08-21 20:41:40,307 INFO L226 Difference]: Without dead ends: 35 [2020-08-21 20:41:40,308 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2020-08-21 20:41:40,308 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-21 20:41:40,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-08-21 20:41:40,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-21 20:41:40,312 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-08-21 20:41:40,312 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 33 [2020-08-21 20:41:40,313 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:40,313 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-08-21 20:41:40,313 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-21 20:41:40,313 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-08-21 20:41:40,314 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-21 20:41:40,314 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:40,314 INFO L422 BasicCegarLoop]: trace histogram [24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:40,314 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-21 20:41:40,314 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:40,314 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:40,315 INFO L82 PathProgramCache]: Analyzing trace with hash -1798054978, now seen corresponding path program 24 times [2020-08-21 20:41:40,315 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:40,315 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [589001747] [2020-08-21 20:41:40,315 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:40,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:40,841 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:40,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:40,844 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:40,845 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [589001747] [2020-08-21 20:41:40,845 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:40,845 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-21 20:41:40,845 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [239329797] [2020-08-21 20:41:40,845 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-21 20:41:40,845 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:40,846 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-21 20:41:40,846 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2020-08-21 20:41:40,846 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 27 states. [2020-08-21 20:41:41,232 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:41,232 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2020-08-21 20:41:41,232 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-21 20:41:41,233 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 34 [2020-08-21 20:41:41,233 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:41,234 INFO L225 Difference]: With dead ends: 41 [2020-08-21 20:41:41,234 INFO L226 Difference]: Without dead ends: 36 [2020-08-21 20:41:41,235 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2020-08-21 20:41:41,235 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-21 20:41:41,239 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-08-21 20:41:41,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-21 20:41:41,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2020-08-21 20:41:41,240 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 34 [2020-08-21 20:41:41,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:41,241 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2020-08-21 20:41:41,241 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-21 20:41:41,241 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2020-08-21 20:41:41,242 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-21 20:41:41,242 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:41,242 INFO L422 BasicCegarLoop]: trace histogram [25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:41,243 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-21 20:41:41,243 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:41,244 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:41,245 INFO L82 PathProgramCache]: Analyzing trace with hash 131331793, now seen corresponding path program 25 times [2020-08-21 20:41:41,245 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:41,245 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1763505669] [2020-08-21 20:41:41,246 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:41,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:41,839 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:41,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:41,846 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:41,846 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1763505669] [2020-08-21 20:41:41,846 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:41,846 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-21 20:41:41,847 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [936586592] [2020-08-21 20:41:41,847 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-21 20:41:41,847 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:41,848 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-21 20:41:41,848 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2020-08-21 20:41:41,848 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 28 states. [2020-08-21 20:41:42,295 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:42,296 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2020-08-21 20:41:42,296 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-21 20:41:42,296 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 35 [2020-08-21 20:41:42,296 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:42,297 INFO L225 Difference]: With dead ends: 42 [2020-08-21 20:41:42,297 INFO L226 Difference]: Without dead ends: 37 [2020-08-21 20:41:42,297 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2020-08-21 20:41:42,298 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-21 20:41:42,301 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-08-21 20:41:42,301 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-21 20:41:42,301 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2020-08-21 20:41:42,302 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 35 [2020-08-21 20:41:42,302 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:42,302 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2020-08-21 20:41:42,302 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-21 20:41:42,302 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2020-08-21 20:41:42,303 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-21 20:41:42,303 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:42,303 INFO L422 BasicCegarLoop]: trace histogram [26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:42,303 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-21 20:41:42,303 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:42,303 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:42,304 INFO L82 PathProgramCache]: Analyzing trace with hash -187220450, now seen corresponding path program 26 times [2020-08-21 20:41:42,304 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:42,304 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [142032105] [2020-08-21 20:41:42,304 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:42,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:42,889 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:42,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:42,894 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:42,894 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [142032105] [2020-08-21 20:41:42,894 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:42,894 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-21 20:41:42,895 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [58429942] [2020-08-21 20:41:42,895 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-21 20:41:42,895 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:42,895 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-21 20:41:42,896 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=731, Unknown=0, NotChecked=0, Total=812 [2020-08-21 20:41:42,896 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 29 states. [2020-08-21 20:41:43,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:43,309 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2020-08-21 20:41:43,309 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-21 20:41:43,310 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 36 [2020-08-21 20:41:43,310 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:43,310 INFO L225 Difference]: With dead ends: 43 [2020-08-21 20:41:43,310 INFO L226 Difference]: Without dead ends: 38 [2020-08-21 20:41:43,311 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=81, Invalid=731, Unknown=0, NotChecked=0, Total=812 [2020-08-21 20:41:43,311 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-21 20:41:43,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-08-21 20:41:43,315 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-21 20:41:43,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2020-08-21 20:41:43,315 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 36 [2020-08-21 20:41:43,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:43,315 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2020-08-21 20:41:43,315 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-21 20:41:43,316 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2020-08-21 20:41:43,316 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-21 20:41:43,316 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:43,316 INFO L422 BasicCegarLoop]: trace histogram [27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:43,317 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-21 20:41:43,317 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:43,317 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:43,317 INFO L82 PathProgramCache]: Analyzing trace with hash -1472405391, now seen corresponding path program 27 times [2020-08-21 20:41:43,317 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:43,317 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2145878589] [2020-08-21 20:41:43,318 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:43,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:43,966 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:43,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:43,970 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:43,970 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2145878589] [2020-08-21 20:41:43,971 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:43,971 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-21 20:41:43,971 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [56458434] [2020-08-21 20:41:43,971 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-21 20:41:43,971 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:43,972 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-21 20:41:43,972 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2020-08-21 20:41:43,972 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 30 states. [2020-08-21 20:41:44,498 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:44,498 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-08-21 20:41:44,499 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-21 20:41:44,499 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 37 [2020-08-21 20:41:44,500 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:44,500 INFO L225 Difference]: With dead ends: 44 [2020-08-21 20:41:44,500 INFO L226 Difference]: Without dead ends: 39 [2020-08-21 20:41:44,501 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2020-08-21 20:41:44,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-21 20:41:44,505 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-21 20:41:44,505 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-21 20:41:44,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2020-08-21 20:41:44,506 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 37 [2020-08-21 20:41:44,506 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:44,506 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2020-08-21 20:41:44,506 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-21 20:41:44,506 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2020-08-21 20:41:44,507 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-21 20:41:44,507 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:44,507 INFO L422 BasicCegarLoop]: trace histogram [28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:44,507 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-21 20:41:44,507 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:44,507 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:44,508 INFO L82 PathProgramCache]: Analyzing trace with hash 1636534398, now seen corresponding path program 28 times [2020-08-21 20:41:44,508 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:44,508 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [523135659] [2020-08-21 20:41:44,508 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:44,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:45,201 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:45,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:45,206 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:45,206 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [523135659] [2020-08-21 20:41:45,206 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:45,206 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-21 20:41:45,207 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [565133291] [2020-08-21 20:41:45,207 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-21 20:41:45,207 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:45,207 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-21 20:41:45,208 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2020-08-21 20:41:45,208 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 31 states. [2020-08-21 20:41:45,761 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:45,761 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2020-08-21 20:41:45,761 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-21 20:41:45,762 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 38 [2020-08-21 20:41:45,762 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:45,762 INFO L225 Difference]: With dead ends: 45 [2020-08-21 20:41:45,763 INFO L226 Difference]: Without dead ends: 40 [2020-08-21 20:41:45,764 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2020-08-21 20:41:45,764 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-21 20:41:45,768 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-08-21 20:41:45,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-21 20:41:45,769 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2020-08-21 20:41:45,769 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 38 [2020-08-21 20:41:45,769 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:45,769 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2020-08-21 20:41:45,769 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-21 20:41:45,770 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2020-08-21 20:41:45,770 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-21 20:41:45,770 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:45,770 INFO L422 BasicCegarLoop]: trace histogram [29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:45,770 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-21 20:41:45,771 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:45,771 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:45,771 INFO L82 PathProgramCache]: Analyzing trace with hash -770579951, now seen corresponding path program 29 times [2020-08-21 20:41:45,771 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:45,771 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [528784021] [2020-08-21 20:41:45,772 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:45,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:46,504 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:46,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:46,509 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:46,509 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [528784021] [2020-08-21 20:41:46,509 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:46,510 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-21 20:41:46,510 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2139161709] [2020-08-21 20:41:46,510 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-21 20:41:46,510 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:46,511 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-21 20:41:46,511 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=902, Unknown=0, NotChecked=0, Total=992 [2020-08-21 20:41:46,511 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 32 states. [2020-08-21 20:41:47,117 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:47,117 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2020-08-21 20:41:47,118 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-21 20:41:47,118 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 39 [2020-08-21 20:41:47,118 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:47,119 INFO L225 Difference]: With dead ends: 46 [2020-08-21 20:41:47,119 INFO L226 Difference]: Without dead ends: 41 [2020-08-21 20:41:47,120 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=90, Invalid=902, Unknown=0, NotChecked=0, Total=992 [2020-08-21 20:41:47,120 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-21 20:41:47,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-21 20:41:47,124 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-21 20:41:47,125 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-08-21 20:41:47,125 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 39 [2020-08-21 20:41:47,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:47,125 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-08-21 20:41:47,125 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-21 20:41:47,126 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-08-21 20:41:47,126 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-21 20:41:47,126 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:47,126 INFO L422 BasicCegarLoop]: trace histogram [30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:47,126 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-21 20:41:47,127 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:47,127 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:47,127 INFO L82 PathProgramCache]: Analyzing trace with hash 1918286558, now seen corresponding path program 30 times [2020-08-21 20:41:47,127 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:47,127 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [769041471] [2020-08-21 20:41:47,128 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:47,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:47,915 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:47,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:47,920 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:47,920 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [769041471] [2020-08-21 20:41:47,920 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:47,920 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-21 20:41:47,921 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2080915425] [2020-08-21 20:41:47,921 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-21 20:41:47,921 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:47,921 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-21 20:41:47,922 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2020-08-21 20:41:47,922 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 33 states. [2020-08-21 20:41:48,551 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:48,551 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2020-08-21 20:41:48,553 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-21 20:41:48,553 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 40 [2020-08-21 20:41:48,553 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:48,554 INFO L225 Difference]: With dead ends: 47 [2020-08-21 20:41:48,554 INFO L226 Difference]: Without dead ends: 42 [2020-08-21 20:41:48,554 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2020-08-21 20:41:48,555 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-21 20:41:48,557 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-08-21 20:41:48,558 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-21 20:41:48,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2020-08-21 20:41:48,558 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 40 [2020-08-21 20:41:48,558 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:48,559 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2020-08-21 20:41:48,559 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-21 20:41:48,559 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2020-08-21 20:41:48,559 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-21 20:41:48,559 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:48,559 INFO L422 BasicCegarLoop]: trace histogram [31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:48,560 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-21 20:41:48,560 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:48,560 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:48,560 INFO L82 PathProgramCache]: Analyzing trace with hash -626197583, now seen corresponding path program 31 times [2020-08-21 20:41:48,560 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:48,560 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [514232702] [2020-08-21 20:41:48,561 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:48,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:49,401 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:49,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:49,406 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:49,406 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [514232702] [2020-08-21 20:41:49,406 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:49,406 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-21 20:41:49,407 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1059001744] [2020-08-21 20:41:49,407 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-21 20:41:49,407 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:49,407 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-21 20:41:49,408 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2020-08-21 20:41:49,408 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 34 states. [2020-08-21 20:41:50,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:50,051 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2020-08-21 20:41:50,051 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-21 20:41:50,051 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 41 [2020-08-21 20:41:50,052 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:50,052 INFO L225 Difference]: With dead ends: 48 [2020-08-21 20:41:50,052 INFO L226 Difference]: Without dead ends: 43 [2020-08-21 20:41:50,053 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2020-08-21 20:41:50,054 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-21 20:41:50,057 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-21 20:41:50,057 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-21 20:41:50,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2020-08-21 20:41:50,058 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 41 [2020-08-21 20:41:50,058 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:50,058 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2020-08-21 20:41:50,058 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-21 20:41:50,058 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2020-08-21 20:41:50,058 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-21 20:41:50,059 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:50,059 INFO L422 BasicCegarLoop]: trace histogram [32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:50,059 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-21 20:41:50,059 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:50,059 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:50,059 INFO L82 PathProgramCache]: Analyzing trace with hash 2099172670, now seen corresponding path program 32 times [2020-08-21 20:41:50,060 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:50,060 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1633925484] [2020-08-21 20:41:50,060 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:50,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:50,945 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:50,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:50,952 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:50,953 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1633925484] [2020-08-21 20:41:50,953 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:50,953 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-21 20:41:50,953 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1124065060] [2020-08-21 20:41:50,953 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-21 20:41:50,954 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:50,954 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-21 20:41:50,954 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=1091, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 20:41:50,954 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 35 states. [2020-08-21 20:41:51,675 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:51,675 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2020-08-21 20:41:51,676 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-21 20:41:51,676 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 42 [2020-08-21 20:41:51,676 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:51,677 INFO L225 Difference]: With dead ends: 49 [2020-08-21 20:41:51,677 INFO L226 Difference]: Without dead ends: 44 [2020-08-21 20:41:51,677 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=99, Invalid=1091, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 20:41:51,678 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-21 20:41:51,680 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-08-21 20:41:51,680 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-21 20:41:51,681 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2020-08-21 20:41:51,681 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 42 [2020-08-21 20:41:51,681 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:51,681 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2020-08-21 20:41:51,681 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-21 20:41:51,681 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2020-08-21 20:41:51,682 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-21 20:41:51,682 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:51,682 INFO L422 BasicCegarLoop]: trace histogram [33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:51,682 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-21 20:41:51,682 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:51,682 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:51,683 INFO L82 PathProgramCache]: Analyzing trace with hash 686304593, now seen corresponding path program 33 times [2020-08-21 20:41:51,683 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:51,683 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [368975524] [2020-08-21 20:41:51,683 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:51,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:52,601 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:52,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:52,606 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:52,606 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [368975524] [2020-08-21 20:41:52,606 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:52,606 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-21 20:41:52,606 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1492734986] [2020-08-21 20:41:52,607 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-21 20:41:52,607 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:52,607 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-21 20:41:52,607 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2020-08-21 20:41:52,608 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 36 states. [2020-08-21 20:41:53,363 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:53,364 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-08-21 20:41:53,364 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-21 20:41:53,364 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 43 [2020-08-21 20:41:53,365 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:53,365 INFO L225 Difference]: With dead ends: 50 [2020-08-21 20:41:53,365 INFO L226 Difference]: Without dead ends: 45 [2020-08-21 20:41:53,366 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2020-08-21 20:41:53,367 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-21 20:41:53,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-08-21 20:41:53,369 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-21 20:41:53,370 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2020-08-21 20:41:53,370 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 43 [2020-08-21 20:41:53,370 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:53,370 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2020-08-21 20:41:53,370 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-21 20:41:53,370 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2020-08-21 20:41:53,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-21 20:41:53,371 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:53,371 INFO L422 BasicCegarLoop]: trace histogram [34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:53,371 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-21 20:41:53,371 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:53,371 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:53,371 INFO L82 PathProgramCache]: Analyzing trace with hash -162932834, now seen corresponding path program 34 times [2020-08-21 20:41:53,372 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:53,372 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2105789480] [2020-08-21 20:41:53,372 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:53,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:54,350 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:54,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:54,355 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:54,356 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2105789480] [2020-08-21 20:41:54,356 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:54,356 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-21 20:41:54,356 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1236642061] [2020-08-21 20:41:54,357 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-21 20:41:54,357 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:54,357 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-21 20:41:54,357 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=1227, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 20:41:54,358 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 37 states. [2020-08-21 20:41:55,154 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:55,154 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2020-08-21 20:41:55,155 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-21 20:41:55,155 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 44 [2020-08-21 20:41:55,155 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:55,156 INFO L225 Difference]: With dead ends: 51 [2020-08-21 20:41:55,156 INFO L226 Difference]: Without dead ends: 46 [2020-08-21 20:41:55,157 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=105, Invalid=1227, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 20:41:55,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-21 20:41:55,160 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-08-21 20:41:55,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-21 20:41:55,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2020-08-21 20:41:55,161 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 44 [2020-08-21 20:41:55,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:55,161 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2020-08-21 20:41:55,161 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-21 20:41:55,161 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2020-08-21 20:41:55,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-21 20:41:55,162 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:55,162 INFO L422 BasicCegarLoop]: trace histogram [35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:55,162 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-21 20:41:55,162 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:55,162 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:55,163 INFO L82 PathProgramCache]: Analyzing trace with hash -719489295, now seen corresponding path program 35 times [2020-08-21 20:41:55,163 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:55,163 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1704779821] [2020-08-21 20:41:55,163 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:55,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:56,206 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:56,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:56,212 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:56,212 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1704779821] [2020-08-21 20:41:56,212 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:56,212 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-21 20:41:56,212 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1969397472] [2020-08-21 20:41:56,213 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-21 20:41:56,213 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:56,213 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-21 20:41:56,213 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=1298, Unknown=0, NotChecked=0, Total=1406 [2020-08-21 20:41:56,214 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand 38 states. [2020-08-21 20:41:57,045 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:57,045 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2020-08-21 20:41:57,051 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-21 20:41:57,051 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 45 [2020-08-21 20:41:57,051 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:57,052 INFO L225 Difference]: With dead ends: 52 [2020-08-21 20:41:57,052 INFO L226 Difference]: Without dead ends: 47 [2020-08-21 20:41:57,053 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=108, Invalid=1298, Unknown=0, NotChecked=0, Total=1406 [2020-08-21 20:41:57,053 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-21 20:41:57,057 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-08-21 20:41:57,057 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-21 20:41:57,058 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2020-08-21 20:41:57,058 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 45 [2020-08-21 20:41:57,058 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:57,058 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2020-08-21 20:41:57,058 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-21 20:41:57,058 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2020-08-21 20:41:57,059 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-21 20:41:57,059 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:57,059 INFO L422 BasicCegarLoop]: trace histogram [36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:57,059 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-21 20:41:57,059 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:57,060 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:57,060 INFO L82 PathProgramCache]: Analyzing trace with hash -792870402, now seen corresponding path program 36 times [2020-08-21 20:41:57,060 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:57,060 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [690383792] [2020-08-21 20:41:57,060 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:57,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:58,123 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:58,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:58,129 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:58,129 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [690383792] [2020-08-21 20:41:58,129 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:58,129 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-21 20:41:58,129 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2046799245] [2020-08-21 20:41:58,130 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-21 20:41:58,130 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:58,130 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-21 20:41:58,131 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 20:41:58,131 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 39 states. [2020-08-21 20:41:59,034 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:59,034 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2020-08-21 20:41:59,035 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-21 20:41:59,036 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 46 [2020-08-21 20:41:59,036 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:59,036 INFO L225 Difference]: With dead ends: 53 [2020-08-21 20:41:59,037 INFO L226 Difference]: Without dead ends: 48 [2020-08-21 20:41:59,038 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 20:41:59,038 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-21 20:41:59,041 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-08-21 20:41:59,041 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-21 20:41:59,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2020-08-21 20:41:59,042 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 46 [2020-08-21 20:41:59,042 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:59,042 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2020-08-21 20:41:59,043 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-21 20:41:59,043 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2020-08-21 20:41:59,043 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-21 20:41:59,043 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:59,043 INFO L422 BasicCegarLoop]: trace histogram [37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:59,044 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-21 20:41:59,044 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:59,044 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:59,044 INFO L82 PathProgramCache]: Analyzing trace with hash 1227282577, now seen corresponding path program 37 times [2020-08-21 20:41:59,044 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:59,045 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [748703902] [2020-08-21 20:41:59,045 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:59,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:42:00,159 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:42:00,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:42:00,164 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:42:00,165 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [748703902] [2020-08-21 20:42:00,165 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:42:00,165 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-21 20:42:00,165 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1901378845] [2020-08-21 20:42:00,166 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-21 20:42:00,166 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:42:00,166 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-21 20:42:00,167 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=1446, Unknown=0, NotChecked=0, Total=1560 [2020-08-21 20:42:00,167 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 40 states. [2020-08-21 20:42:01,102 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:42:01,102 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2020-08-21 20:42:01,103 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-21 20:42:01,103 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 47 [2020-08-21 20:42:01,103 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:42:01,104 INFO L225 Difference]: With dead ends: 54 [2020-08-21 20:42:01,104 INFO L226 Difference]: Without dead ends: 49 [2020-08-21 20:42:01,105 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=114, Invalid=1446, Unknown=0, NotChecked=0, Total=1560 [2020-08-21 20:42:01,105 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-21 20:42:01,110 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-21 20:42:01,110 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-21 20:42:01,111 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2020-08-21 20:42:01,111 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 47 [2020-08-21 20:42:01,111 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:42:01,111 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2020-08-21 20:42:01,111 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-21 20:42:01,112 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2020-08-21 20:42:01,112 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-21 20:42:01,112 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:42:01,112 INFO L422 BasicCegarLoop]: trace histogram [38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:42:01,112 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-21 20:42:01,113 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:42:01,113 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:42:01,113 INFO L82 PathProgramCache]: Analyzing trace with hash -572484514, now seen corresponding path program 38 times [2020-08-21 20:42:01,113 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:42:01,113 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [901801227] [2020-08-21 20:42:01,113 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:42:01,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:42:02,251 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:42:02,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:42:02,256 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:42:02,256 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [901801227] [2020-08-21 20:42:02,256 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:42:02,256 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-21 20:42:02,256 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [488539461] [2020-08-21 20:42:02,257 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-21 20:42:02,257 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:42:02,257 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-21 20:42:02,257 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=1523, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 20:42:02,258 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 41 states. [2020-08-21 20:42:03,271 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:42:03,271 INFO L93 Difference]: Finished difference Result 55 states and 55 transitions. [2020-08-21 20:42:03,272 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-21 20:42:03,272 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 48 [2020-08-21 20:42:03,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:42:03,273 INFO L225 Difference]: With dead ends: 55 [2020-08-21 20:42:03,273 INFO L226 Difference]: Without dead ends: 50 [2020-08-21 20:42:03,274 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=117, Invalid=1523, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 20:42:03,274 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-08-21 20:42:03,277 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2020-08-21 20:42:03,277 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-08-21 20:42:03,277 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2020-08-21 20:42:03,277 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 48 [2020-08-21 20:42:03,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:42:03,278 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2020-08-21 20:42:03,278 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-21 20:42:03,278 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2020-08-21 20:42:03,278 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-08-21 20:42:03,278 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:42:03,278 INFO L422 BasicCegarLoop]: trace histogram [39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:42:03,279 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-21 20:42:03,279 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:42:03,279 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:42:03,279 INFO L82 PathProgramCache]: Analyzing trace with hash -530689487, now seen corresponding path program 39 times [2020-08-21 20:42:03,279 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:42:03,279 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1898487782] [2020-08-21 20:42:03,279 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:42:03,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:42:04,468 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:42:04,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:42:04,474 INFO L134 CoverageAnalysis]: Checked inductivity of 780 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:42:04,474 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1898487782] [2020-08-21 20:42:04,474 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:42:04,474 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-21 20:42:04,474 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [646520370] [2020-08-21 20:42:04,474 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-21 20:42:04,475 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:42:04,475 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-21 20:42:04,475 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=1602, Unknown=0, NotChecked=0, Total=1722 [2020-08-21 20:42:04,475 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand 42 states. [2020-08-21 20:42:05,525 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:42:05,525 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2020-08-21 20:42:05,526 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-21 20:42:05,526 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 49 [2020-08-21 20:42:05,526 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:42:05,527 INFO L225 Difference]: With dead ends: 56 [2020-08-21 20:42:05,527 INFO L226 Difference]: Without dead ends: 51 [2020-08-21 20:42:05,528 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=120, Invalid=1602, Unknown=0, NotChecked=0, Total=1722 [2020-08-21 20:42:05,528 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-08-21 20:42:05,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2020-08-21 20:42:05,531 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-21 20:42:05,531 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2020-08-21 20:42:05,532 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 49 [2020-08-21 20:42:05,532 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:42:05,532 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2020-08-21 20:42:05,532 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-21 20:42:05,532 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2020-08-21 20:42:05,532 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-21 20:42:05,533 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:42:05,533 INFO L422 BasicCegarLoop]: trace histogram [40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:42:05,533 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-21 20:42:05,533 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:42:05,533 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:42:05,533 INFO L82 PathProgramCache]: Analyzing trace with hash 764956350, now seen corresponding path program 40 times [2020-08-21 20:42:05,533 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:42:05,534 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1195151425] [2020-08-21 20:42:05,534 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:42:05,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:42:06,786 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:42:06,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:42:06,791 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 0 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:42:06,791 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1195151425] [2020-08-21 20:42:06,791 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:42:06,791 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-21 20:42:06,792 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1475078771] [2020-08-21 20:42:06,792 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-21 20:42:06,792 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:42:06,792 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-21 20:42:06,793 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=1683, Unknown=0, NotChecked=0, Total=1806 [2020-08-21 20:42:06,793 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 43 states. [2020-08-21 20:42:07,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:42:07,928 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2020-08-21 20:42:07,929 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-21 20:42:07,929 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 50 [2020-08-21 20:42:07,929 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:42:07,930 INFO L225 Difference]: With dead ends: 57 [2020-08-21 20:42:07,930 INFO L226 Difference]: Without dead ends: 52 [2020-08-21 20:42:07,931 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=123, Invalid=1683, Unknown=0, NotChecked=0, Total=1806 [2020-08-21 20:42:07,932 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-21 20:42:07,935 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2020-08-21 20:42:07,935 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-21 20:42:07,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2020-08-21 20:42:07,935 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 50 [2020-08-21 20:42:07,936 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:42:07,936 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2020-08-21 20:42:07,936 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-21 20:42:07,936 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2020-08-21 20:42:07,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-08-21 20:42:07,936 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:42:07,937 INFO L422 BasicCegarLoop]: trace histogram [41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:42:07,937 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-21 20:42:07,937 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:42:07,937 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:42:07,937 INFO L82 PathProgramCache]: Analyzing trace with hash -2019695663, now seen corresponding path program 41 times [2020-08-21 20:42:07,937 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:42:07,938 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1057020705] [2020-08-21 20:42:07,938 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:42:07,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:42:09,581 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:42:09,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:42:09,590 INFO L134 CoverageAnalysis]: Checked inductivity of 861 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:42:09,590 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1057020705] [2020-08-21 20:42:09,590 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:42:09,590 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-08-21 20:42:09,591 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1614011911] [2020-08-21 20:42:09,591 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-08-21 20:42:09,591 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:42:09,591 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-08-21 20:42:09,592 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=1766, Unknown=0, NotChecked=0, Total=1892 [2020-08-21 20:42:09,592 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 44 states. [2020-08-21 20:42:10,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:42:10,729 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2020-08-21 20:42:10,729 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-08-21 20:42:10,729 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 51 [2020-08-21 20:42:10,730 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:42:10,731 INFO L225 Difference]: With dead ends: 58 [2020-08-21 20:42:10,731 INFO L226 Difference]: Without dead ends: 53 [2020-08-21 20:42:10,732 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=126, Invalid=1766, Unknown=0, NotChecked=0, Total=1892 [2020-08-21 20:42:10,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-21 20:42:10,736 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2020-08-21 20:42:10,736 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-21 20:42:10,736 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2020-08-21 20:42:10,738 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 51 [2020-08-21 20:42:10,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:42:10,738 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2020-08-21 20:42:10,738 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-08-21 20:42:10,738 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2020-08-21 20:42:10,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-21 20:42:10,739 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:42:10,739 INFO L422 BasicCegarLoop]: trace histogram [42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:42:10,739 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-21 20:42:10,739 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:42:10,740 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:42:10,740 INFO L82 PathProgramCache]: Analyzing trace with hash 1850405150, now seen corresponding path program 42 times [2020-08-21 20:42:10,740 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:42:10,740 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1436292282] [2020-08-21 20:42:10,740 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:42:10,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:42:12,431 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:42:12,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:42:12,439 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 0 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:42:12,439 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1436292282] [2020-08-21 20:42:12,439 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:42:12,440 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-08-21 20:42:12,440 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [139188574] [2020-08-21 20:42:12,440 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-08-21 20:42:12,440 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:42:12,441 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-08-21 20:42:12,441 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=1851, Unknown=0, NotChecked=0, Total=1980 [2020-08-21 20:42:12,442 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 45 states. [2020-08-21 20:42:13,684 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:42:13,684 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2020-08-21 20:42:13,687 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-08-21 20:42:13,687 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 52 [2020-08-21 20:42:13,687 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:42:13,688 INFO L225 Difference]: With dead ends: 59 [2020-08-21 20:42:13,688 INFO L226 Difference]: Without dead ends: 54 [2020-08-21 20:42:13,689 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=129, Invalid=1851, Unknown=0, NotChecked=0, Total=1980 [2020-08-21 20:42:13,689 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-21 20:42:13,692 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2020-08-21 20:42:13,692 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-21 20:42:13,693 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2020-08-21 20:42:13,693 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 52 [2020-08-21 20:42:13,693 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:42:13,693 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2020-08-21 20:42:13,693 INFO L480 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-08-21 20:42:13,693 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2020-08-21 20:42:13,694 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-08-21 20:42:13,694 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:42:13,694 INFO L422 BasicCegarLoop]: trace histogram [43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:42:13,694 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2020-08-21 20:42:13,694 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:42:13,694 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:42:13,695 INFO L82 PathProgramCache]: Analyzing trace with hash 1564446065, now seen corresponding path program 43 times [2020-08-21 20:42:13,695 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:42:13,695 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1502648068] [2020-08-21 20:42:13,695 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:42:13,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:42:15,171 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:42:15,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:42:15,177 INFO L134 CoverageAnalysis]: Checked inductivity of 946 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:42:15,180 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1502648068] [2020-08-21 20:42:15,180 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:42:15,180 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46] total 46 [2020-08-21 20:42:15,181 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1711001525] [2020-08-21 20:42:15,182 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-08-21 20:42:15,182 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:42:15,182 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-08-21 20:42:15,185 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=1938, Unknown=0, NotChecked=0, Total=2070 [2020-08-21 20:42:15,185 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand 46 states. [2020-08-21 20:42:16,467 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:42:16,468 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2020-08-21 20:42:16,468 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-08-21 20:42:16,468 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 53 [2020-08-21 20:42:16,469 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:42:16,469 INFO L225 Difference]: With dead ends: 60 [2020-08-21 20:42:16,469 INFO L226 Difference]: Without dead ends: 55 [2020-08-21 20:42:16,470 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=132, Invalid=1938, Unknown=0, NotChecked=0, Total=2070 [2020-08-21 20:42:16,470 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-21 20:42:16,473 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2020-08-21 20:42:16,473 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-21 20:42:16,473 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2020-08-21 20:42:16,473 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 53 [2020-08-21 20:42:16,474 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:42:16,474 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2020-08-21 20:42:16,474 INFO L480 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-08-21 20:42:16,474 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2020-08-21 20:42:16,474 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-21 20:42:16,474 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:42:16,474 INFO L422 BasicCegarLoop]: trace histogram [44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:42:16,474 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2020-08-21 20:42:16,475 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:42:16,475 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:42:16,475 INFO L82 PathProgramCache]: Analyzing trace with hash 1289649022, now seen corresponding path program 44 times [2020-08-21 20:42:16,475 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:42:16,475 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1885238638] [2020-08-21 20:42:16,475 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:42:16,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:42:17,995 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:42:17,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:42:18,002 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:42:18,002 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1885238638] [2020-08-21 20:42:18,002 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:42:18,002 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47] total 47 [2020-08-21 20:42:18,002 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1433089419] [2020-08-21 20:42:18,003 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-08-21 20:42:18,003 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:42:18,003 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-08-21 20:42:18,003 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=2027, Unknown=0, NotChecked=0, Total=2162 [2020-08-21 20:42:18,003 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 47 states. [2020-08-21 20:42:19,363 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:42:19,363 INFO L93 Difference]: Finished difference Result 61 states and 61 transitions. [2020-08-21 20:42:19,364 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2020-08-21 20:42:19,364 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 54 [2020-08-21 20:42:19,364 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:42:19,365 INFO L225 Difference]: With dead ends: 61 [2020-08-21 20:42:19,365 INFO L226 Difference]: Without dead ends: 56 [2020-08-21 20:42:19,365 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=135, Invalid=2027, Unknown=0, NotChecked=0, Total=2162 [2020-08-21 20:42:19,366 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-21 20:42:19,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2020-08-21 20:42:19,369 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-08-21 20:42:19,370 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 56 transitions. [2020-08-21 20:42:19,370 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 56 transitions. Word has length 54 [2020-08-21 20:42:19,370 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:42:19,370 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 56 transitions. [2020-08-21 20:42:19,370 INFO L480 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-08-21 20:42:19,370 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 56 transitions. [2020-08-21 20:42:19,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-08-21 20:42:19,371 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:42:19,371 INFO L422 BasicCegarLoop]: trace histogram [45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:42:19,371 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2020-08-21 20:42:19,371 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:42:19,372 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:42:19,372 INFO L82 PathProgramCache]: Analyzing trace with hash 1360875281, now seen corresponding path program 45 times [2020-08-21 20:42:19,372 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:42:19,372 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [119694649] [2020-08-21 20:42:19,372 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:42:19,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:42:20,935 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:42:20,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:42:20,942 INFO L134 CoverageAnalysis]: Checked inductivity of 1035 backedges. 0 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:42:20,942 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [119694649] [2020-08-21 20:42:20,942 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:42:20,943 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48] total 48 [2020-08-21 20:42:20,943 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [206086822] [2020-08-21 20:42:20,943 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-08-21 20:42:20,943 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:42:20,943 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-08-21 20:42:20,944 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=2118, Unknown=0, NotChecked=0, Total=2256 [2020-08-21 20:42:20,944 INFO L87 Difference]: Start difference. First operand 56 states and 56 transitions. Second operand 48 states. [2020-08-21 20:42:22,313 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:42:22,314 INFO L93 Difference]: Finished difference Result 62 states and 62 transitions. [2020-08-21 20:42:22,318 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-08-21 20:42:22,318 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 55 [2020-08-21 20:42:22,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:42:22,319 INFO L225 Difference]: With dead ends: 62 [2020-08-21 20:42:22,319 INFO L226 Difference]: Without dead ends: 57 [2020-08-21 20:42:22,319 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=138, Invalid=2118, Unknown=0, NotChecked=0, Total=2256 [2020-08-21 20:42:22,320 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-08-21 20:42:22,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2020-08-21 20:42:22,323 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-21 20:42:22,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2020-08-21 20:42:22,324 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 55 [2020-08-21 20:42:22,324 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:42:22,324 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2020-08-21 20:42:22,324 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-08-21 20:42:22,324 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2020-08-21 20:42:22,325 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-21 20:42:22,325 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:42:22,325 INFO L422 BasicCegarLoop]: trace histogram [46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:42:22,325 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2020-08-21 20:42:22,325 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:42:22,326 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:42:22,326 INFO L82 PathProgramCache]: Analyzing trace with hash -726077986, now seen corresponding path program 46 times [2020-08-21 20:42:22,326 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:42:22,326 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [486612025] [2020-08-21 20:42:22,326 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:42:22,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:42:23,976 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:42:23,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:42:23,987 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:42:23,988 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [486612025] [2020-08-21 20:42:23,988 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:42:23,988 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49] total 49 [2020-08-21 20:42:23,988 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1753511606] [2020-08-21 20:42:23,989 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2020-08-21 20:42:23,989 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:42:23,989 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2020-08-21 20:42:23,990 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=2211, Unknown=0, NotChecked=0, Total=2352 [2020-08-21 20:42:23,990 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 49 states. [2020-08-21 20:42:25,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:42:25,395 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2020-08-21 20:42:25,395 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2020-08-21 20:42:25,395 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 56 [2020-08-21 20:42:25,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:42:25,396 INFO L225 Difference]: With dead ends: 63 [2020-08-21 20:42:25,396 INFO L226 Difference]: Without dead ends: 58 [2020-08-21 20:42:25,397 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=141, Invalid=2211, Unknown=0, NotChecked=0, Total=2352 [2020-08-21 20:42:25,397 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-21 20:42:25,399 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2020-08-21 20:42:25,399 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-08-21 20:42:25,399 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 58 transitions. [2020-08-21 20:42:25,400 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 58 transitions. Word has length 56 [2020-08-21 20:42:25,400 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:42:25,400 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 58 transitions. [2020-08-21 20:42:25,400 INFO L480 AbstractCegarLoop]: Interpolant automaton has 49 states. [2020-08-21 20:42:25,400 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 58 transitions. [2020-08-21 20:42:25,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-08-21 20:42:25,400 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:42:25,400 INFO L422 BasicCegarLoop]: trace histogram [47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:42:25,401 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2020-08-21 20:42:25,401 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:42:25,401 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:42:25,401 INFO L82 PathProgramCache]: Analyzing trace with hash -997119823, now seen corresponding path program 47 times [2020-08-21 20:42:25,401 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:42:25,401 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1371124596] [2020-08-21 20:42:25,401 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:42:25,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat