/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=HIGHLEXORDER --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-lit/ddlm2013.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 19:05:04,755 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 19:05:04,759 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 19:05:04,796 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 19:05:04,797 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 19:05:04,805 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 19:05:04,808 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 19:05:04,812 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 19:05:04,815 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 19:05:04,818 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 19:05:04,819 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 19:05:04,820 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 19:05:04,820 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 19:05:04,823 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 19:05:04,826 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 19:05:04,827 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 19:05:04,828 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 19:05:04,829 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 19:05:04,831 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 19:05:04,839 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 19:05:04,841 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 19:05:04,842 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 19:05:04,843 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 19:05:04,844 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 19:05:04,856 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-21 19:05:04,856 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-21 19:05:04,856 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-21 19:05:04,862 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-21 19:05:04,863 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-21 19:05:04,864 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... 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[2020-08-21 19:05:04,874 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 19:05:04,875 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 19:05:04,876 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 19:05:04,877 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-21 19:05:04,920 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 19:05:04,920 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 19:05:04,921 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 19:05:04,922 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 19:05:04,922 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 19:05:04,922 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 19:05:04,922 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 19:05:04,922 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 19:05:04,923 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 19:05:04,923 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 19:05:04,924 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 19:05:04,925 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 19:05:04,925 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 19:05:04,925 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 19:05:04,925 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 19:05:04,926 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 19:05:04,926 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 19:05:04,926 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 19:05:04,926 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 19:05:04,926 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 19:05:04,927 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 19:05:04,927 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 19:05:04,927 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 19:05:04,927 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 19:05:04,927 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 19:05:04,928 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 19:05:04,928 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 19:05:04,928 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 19:05:04,928 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 19:05:04,928 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=HIGHLEXORDER;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=HIGHLEXORDER;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=HIGHLEXORDER;log-additional-information=true; [2020-08-21 19:05:05,212 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 19:05:05,224 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 19:05:05,229 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 19:05:05,230 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 19:05:05,230 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 19:05:05,231 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/ddlm2013.i [2020-08-21 19:05:05,297 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/b33d8eae4/6b826a937321409db1a2b3b3fbcaf5b3/FLAGef617a4bc [2020-08-21 19:05:05,732 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 19:05:05,733 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-lit/ddlm2013.i [2020-08-21 19:05:05,741 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/b33d8eae4/6b826a937321409db1a2b3b3fbcaf5b3/FLAGef617a4bc [2020-08-21 19:05:06,110 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/b33d8eae4/6b826a937321409db1a2b3b3fbcaf5b3 [2020-08-21 19:05:06,120 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 19:05:06,123 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 19:05:06,124 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 19:05:06,124 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 19:05:06,128 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 19:05:06,129 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 07:05:06" (1/1) ... [2020-08-21 19:05:06,132 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@19701add and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:05:06, skipping insertion in model container [2020-08-21 19:05:06,132 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 07:05:06" (1/1) ... [2020-08-21 19:05:06,140 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 19:05:06,161 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 19:05:06,375 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 19:05:06,379 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 19:05:06,394 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 19:05:06,406 INFO L208 MainTranslator]: Completed translation [2020-08-21 19:05:06,407 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:05:06 WrapperNode [2020-08-21 19:05:06,407 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 19:05:06,408 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 19:05:06,408 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 19:05:06,408 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 19:05:06,418 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:05:06" (1/1) ... [2020-08-21 19:05:06,418 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:05:06" (1/1) ... [2020-08-21 19:05:06,503 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:05:06" (1/1) ... [2020-08-21 19:05:06,508 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:05:06" (1/1) ... [2020-08-21 19:05:06,513 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:05:06" (1/1) ... [2020-08-21 19:05:06,518 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:05:06" (1/1) ... [2020-08-21 19:05:06,519 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:05:06" (1/1) ... [2020-08-21 19:05:06,521 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 19:05:06,521 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 19:05:06,521 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 19:05:06,521 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 19:05:06,522 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:05:06" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 19:05:06,581 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 19:05:06,581 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 19:05:06,582 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-21 19:05:06,583 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-21 19:05:06,583 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 19:05:06,583 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 19:05:06,584 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-21 19:05:06,584 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-21 19:05:06,584 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-21 19:05:06,585 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-21 19:05:06,585 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 19:05:06,585 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 19:05:06,585 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 19:05:06,793 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 19:05:06,793 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-21 19:05:06,798 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 07:05:06 BoogieIcfgContainer [2020-08-21 19:05:06,798 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 19:05:06,800 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 19:05:06,800 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 19:05:06,803 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 19:05:06,804 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 07:05:06" (1/3) ... [2020-08-21 19:05:06,805 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@45179df4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 07:05:06, skipping insertion in model container [2020-08-21 19:05:06,805 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:05:06" (2/3) ... [2020-08-21 19:05:06,805 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@45179df4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 07:05:06, skipping insertion in model container [2020-08-21 19:05:06,805 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 07:05:06" (3/3) ... [2020-08-21 19:05:06,807 INFO L109 eAbstractionObserver]: Analyzing ICFG ddlm2013.i [2020-08-21 19:05:06,819 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 19:05:06,827 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 19:05:06,848 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 19:05:06,878 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 19:05:06,878 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 19:05:06,878 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 19:05:06,878 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 19:05:06,879 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 19:05:06,879 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 19:05:06,879 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 19:05:06,879 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 19:05:06,903 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2020-08-21 19:05:06,911 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-21 19:05:06,911 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:05:06,913 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:05:06,913 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:05:06,921 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:05:06,921 INFO L82 PathProgramCache]: Analyzing trace with hash -917653371, now seen corresponding path program 1 times [2020-08-21 19:05:06,931 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:05:06,932 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [548665080] [2020-08-21 19:05:06,932 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:05:07,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:07,050 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:05:07,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:07,057 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:05:07,058 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [548665080] [2020-08-21 19:05:07,060 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 19:05:07,060 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-08-21 19:05:07,061 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1940430099] [2020-08-21 19:05:07,068 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-08-21 19:05:07,068 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:05:07,083 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-08-21 19:05:07,084 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-21 19:05:07,086 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 2 states. [2020-08-21 19:05:07,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:05:07,112 INFO L93 Difference]: Finished difference Result 35 states and 42 transitions. [2020-08-21 19:05:07,112 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-08-21 19:05:07,114 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 12 [2020-08-21 19:05:07,114 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:05:07,124 INFO L225 Difference]: With dead ends: 35 [2020-08-21 19:05:07,124 INFO L226 Difference]: Without dead ends: 15 [2020-08-21 19:05:07,128 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-21 19:05:07,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-21 19:05:07,166 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-21 19:05:07,168 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-21 19:05:07,169 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-08-21 19:05:07,171 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 12 [2020-08-21 19:05:07,171 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:05:07,171 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-08-21 19:05:07,172 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-08-21 19:05:07,172 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-08-21 19:05:07,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-21 19:05:07,173 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:05:07,173 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:05:07,173 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 19:05:07,174 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:05:07,174 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:05:07,174 INFO L82 PathProgramCache]: Analyzing trace with hash -1750778295, now seen corresponding path program 1 times [2020-08-21 19:05:07,175 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:05:07,175 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1084182771] [2020-08-21 19:05:07,175 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:05:07,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:07,224 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:05:07,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:07,229 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:05:07,229 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1084182771] [2020-08-21 19:05:07,230 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 19:05:07,230 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 19:05:07,230 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [769430658] [2020-08-21 19:05:07,232 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 19:05:07,233 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:05:07,233 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 19:05:07,234 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 19:05:07,234 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 3 states. [2020-08-21 19:05:07,276 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:05:07,277 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2020-08-21 19:05:07,279 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 19:05:07,280 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 13 [2020-08-21 19:05:07,280 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:05:07,282 INFO L225 Difference]: With dead ends: 24 [2020-08-21 19:05:07,282 INFO L226 Difference]: Without dead ends: 15 [2020-08-21 19:05:07,283 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 19:05:07,284 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-21 19:05:07,292 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-21 19:05:07,293 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-21 19:05:07,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2020-08-21 19:05:07,295 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 13 [2020-08-21 19:05:07,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:05:07,296 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2020-08-21 19:05:07,296 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 19:05:07,296 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2020-08-21 19:05:07,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-21 19:05:07,298 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:05:07,299 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:05:07,300 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 19:05:07,301 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:05:07,301 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:05:07,302 INFO L82 PathProgramCache]: Analyzing trace with hash -941431669, now seen corresponding path program 1 times [2020-08-21 19:05:07,303 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:05:07,303 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2100344439] [2020-08-21 19:05:07,304 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:05:07,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:07,680 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:05:07,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:07,686 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:05:07,687 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2100344439] [2020-08-21 19:05:07,687 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 19:05:07,687 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 19:05:07,687 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1192476539] [2020-08-21 19:05:07,688 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 19:05:07,688 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:05:07,689 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 19:05:07,689 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 19:05:07,689 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 5 states. [2020-08-21 19:05:07,726 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:05:07,726 INFO L93 Difference]: Finished difference Result 23 states and 24 transitions. [2020-08-21 19:05:07,727 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 19:05:07,727 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-08-21 19:05:07,728 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:05:07,728 INFO L225 Difference]: With dead ends: 23 [2020-08-21 19:05:07,728 INFO L226 Difference]: Without dead ends: 17 [2020-08-21 19:05:07,729 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-21 19:05:07,730 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-21 19:05:07,733 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-21 19:05:07,734 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-21 19:05:07,734 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2020-08-21 19:05:07,735 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 13 [2020-08-21 19:05:07,735 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:05:07,735 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2020-08-21 19:05:07,735 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 19:05:07,736 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2020-08-21 19:05:07,736 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-21 19:05:07,736 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:05:07,737 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:05:07,737 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 19:05:07,737 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:05:07,738 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:05:07,738 INFO L82 PathProgramCache]: Analyzing trace with hash 447870728, now seen corresponding path program 1 times [2020-08-21 19:05:07,738 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:05:07,739 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [304324471] [2020-08-21 19:05:07,739 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:05:07,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:07,909 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:05:07,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:07,914 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:05:07,914 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [304324471] [2020-08-21 19:05:07,916 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 19:05:07,916 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 19:05:07,917 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [437826276] [2020-08-21 19:05:07,917 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 19:05:07,917 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:05:07,919 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 19:05:07,920 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 19:05:07,920 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand 4 states. [2020-08-21 19:05:07,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:05:07,950 INFO L93 Difference]: Finished difference Result 26 states and 28 transitions. [2020-08-21 19:05:07,951 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 19:05:07,951 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 16 [2020-08-21 19:05:07,952 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:05:07,952 INFO L225 Difference]: With dead ends: 26 [2020-08-21 19:05:07,952 INFO L226 Difference]: Without dead ends: 17 [2020-08-21 19:05:07,954 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 19:05:07,954 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-21 19:05:07,960 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-21 19:05:07,960 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-21 19:05:07,961 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-21 19:05:07,961 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 16 [2020-08-21 19:05:07,961 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:05:07,961 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-21 19:05:07,962 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 19:05:07,964 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-21 19:05:07,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-21 19:05:07,966 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:05:07,966 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:05:07,966 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 19:05:07,966 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:05:07,967 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:05:07,967 INFO L82 PathProgramCache]: Analyzing trace with hash 1257217354, now seen corresponding path program 1 times [2020-08-21 19:05:07,968 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:05:07,968 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2033902630] [2020-08-21 19:05:07,968 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:05:08,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:08,176 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:05:08,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:08,180 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:05:08,180 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2033902630] [2020-08-21 19:05:08,181 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:05:08,181 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 19:05:08,181 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1732397265] [2020-08-21 19:05:08,195 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 19:05:08,196 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:05:08,196 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 19:05:08,196 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-08-21 19:05:08,199 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 7 states. [2020-08-21 19:05:08,319 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:05:08,319 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-08-21 19:05:08,320 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 19:05:08,320 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 16 [2020-08-21 19:05:08,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:05:08,321 INFO L225 Difference]: With dead ends: 26 [2020-08-21 19:05:08,321 INFO L226 Difference]: Without dead ends: 20 [2020-08-21 19:05:08,322 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2020-08-21 19:05:08,323 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-21 19:05:08,327 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-21 19:05:08,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-21 19:05:08,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2020-08-21 19:05:08,329 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 16 [2020-08-21 19:05:08,330 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:05:08,330 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2020-08-21 19:05:08,330 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 19:05:08,330 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2020-08-21 19:05:08,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-21 19:05:08,331 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:05:08,331 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:05:08,332 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 19:05:08,332 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:05:08,332 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:05:08,332 INFO L82 PathProgramCache]: Analyzing trace with hash -1335969749, now seen corresponding path program 2 times [2020-08-21 19:05:08,333 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:05:08,333 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1340347561] [2020-08-21 19:05:08,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:05:08,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:08,578 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:05:08,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:08,582 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:05:08,582 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1340347561] [2020-08-21 19:05:08,583 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:05:08,583 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 19:05:08,583 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [641511804] [2020-08-21 19:05:08,584 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 19:05:08,584 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:05:08,584 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 19:05:08,585 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-08-21 19:05:08,585 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 9 states. [2020-08-21 19:05:08,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:05:08,711 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2020-08-21 19:05:08,711 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 19:05:08,711 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2020-08-21 19:05:08,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:05:08,712 INFO L225 Difference]: With dead ends: 29 [2020-08-21 19:05:08,712 INFO L226 Difference]: Without dead ends: 23 [2020-08-21 19:05:08,713 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2020-08-21 19:05:08,714 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-21 19:05:08,717 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-08-21 19:05:08,717 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-21 19:05:08,718 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-08-21 19:05:08,718 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 19 [2020-08-21 19:05:08,718 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:05:08,719 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-08-21 19:05:08,719 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 19:05:08,719 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-08-21 19:05:08,719 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-21 19:05:08,720 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:05:08,720 INFO L422 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:05:08,720 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 19:05:08,720 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:05:08,720 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:05:08,721 INFO L82 PathProgramCache]: Analyzing trace with hash -1396202070, now seen corresponding path program 3 times [2020-08-21 19:05:08,721 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:05:08,721 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [781764546] [2020-08-21 19:05:08,721 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:05:08,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:08,984 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:05:08,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:08,991 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 19:05:08,991 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [781764546] [2020-08-21 19:05:08,992 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:05:08,992 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 19:05:08,992 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1561659421] [2020-08-21 19:05:08,993 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 19:05:08,993 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:05:08,994 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 19:05:08,994 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2020-08-21 19:05:08,994 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 11 states. [2020-08-21 19:05:13,329 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:05:13,330 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-08-21 19:05:13,330 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 19:05:13,331 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 22 [2020-08-21 19:05:13,331 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:05:13,332 INFO L225 Difference]: With dead ends: 32 [2020-08-21 19:05:13,332 INFO L226 Difference]: Without dead ends: 26 [2020-08-21 19:05:13,332 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=33, Invalid=148, Unknown=1, NotChecked=0, Total=182 [2020-08-21 19:05:13,333 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-21 19:05:13,338 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-08-21 19:05:13,339 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-21 19:05:13,341 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2020-08-21 19:05:13,342 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 22 [2020-08-21 19:05:13,342 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:05:13,342 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2020-08-21 19:05:13,343 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 19:05:13,343 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2020-08-21 19:05:13,344 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-21 19:05:13,344 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:05:13,345 INFO L422 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:05:13,345 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 19:05:13,346 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:05:13,346 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:05:13,346 INFO L82 PathProgramCache]: Analyzing trace with hash -480947253, now seen corresponding path program 4 times [2020-08-21 19:05:13,346 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:05:13,347 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [643650125] [2020-08-21 19:05:13,347 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:05:13,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:13,723 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:05:13,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:13,730 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:05:13,731 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [643650125] [2020-08-21 19:05:13,731 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:05:13,732 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 19:05:13,732 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1691914429] [2020-08-21 19:05:13,733 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 19:05:13,734 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:05:13,735 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 19:05:13,735 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2020-08-21 19:05:13,735 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 13 states. [2020-08-21 19:05:13,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:05:13,951 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2020-08-21 19:05:13,951 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 19:05:13,952 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 25 [2020-08-21 19:05:13,952 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:05:13,953 INFO L225 Difference]: With dead ends: 35 [2020-08-21 19:05:13,953 INFO L226 Difference]: Without dead ends: 29 [2020-08-21 19:05:13,953 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=37, Invalid=203, Unknown=0, NotChecked=0, Total=240 [2020-08-21 19:05:13,954 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-21 19:05:13,957 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-08-21 19:05:13,957 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-21 19:05:13,958 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-08-21 19:05:13,958 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 25 [2020-08-21 19:05:13,958 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:05:13,958 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-08-21 19:05:13,958 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 19:05:13,959 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-08-21 19:05:13,959 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-21 19:05:13,959 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:05:13,960 INFO L422 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:05:13,960 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 19:05:13,960 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:05:13,960 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:05:13,960 INFO L82 PathProgramCache]: Analyzing trace with hash 1422910986, now seen corresponding path program 5 times [2020-08-21 19:05:13,961 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:05:13,961 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2133845493] [2020-08-21 19:05:13,961 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:05:13,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:14,326 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:05:14,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:14,332 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:05:14,333 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2133845493] [2020-08-21 19:05:14,333 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:05:14,333 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-21 19:05:14,337 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1434444748] [2020-08-21 19:05:14,338 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-21 19:05:14,338 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:05:14,338 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-21 19:05:14,338 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2020-08-21 19:05:14,339 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 15 states. [2020-08-21 19:05:20,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:05:20,921 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-08-21 19:05:20,922 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-21 19:05:20,922 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 28 [2020-08-21 19:05:20,922 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:05:20,923 INFO L225 Difference]: With dead ends: 38 [2020-08-21 19:05:20,923 INFO L226 Difference]: Without dead ends: 32 [2020-08-21 19:05:20,924 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=41, Invalid=264, Unknown=1, NotChecked=0, Total=306 [2020-08-21 19:05:20,924 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-21 19:05:20,932 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-08-21 19:05:20,933 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-21 19:05:20,933 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2020-08-21 19:05:20,933 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 28 [2020-08-21 19:05:20,934 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:05:20,934 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2020-08-21 19:05:20,934 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-21 19:05:20,934 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2020-08-21 19:05:20,935 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-21 19:05:20,935 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:05:20,935 INFO L422 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:05:20,936 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 19:05:20,936 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:05:20,936 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:05:20,936 INFO L82 PathProgramCache]: Analyzing trace with hash -74401941, now seen corresponding path program 6 times [2020-08-21 19:05:20,939 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:05:20,939 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [852763917] [2020-08-21 19:05:20,940 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:05:20,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:21,430 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:05:21,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:21,436 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:05:21,436 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [852763917] [2020-08-21 19:05:21,437 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:05:21,437 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-21 19:05:21,437 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1234002896] [2020-08-21 19:05:21,438 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-21 19:05:21,438 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:05:21,438 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-21 19:05:21,438 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2020-08-21 19:05:21,439 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 17 states. [2020-08-21 19:05:36,396 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:05:36,396 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2020-08-21 19:05:36,396 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-21 19:05:36,397 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 31 [2020-08-21 19:05:36,397 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:05:36,398 INFO L225 Difference]: With dead ends: 41 [2020-08-21 19:05:36,398 INFO L226 Difference]: Without dead ends: 35 [2020-08-21 19:05:36,399 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=45, Invalid=333, Unknown=2, NotChecked=0, Total=380 [2020-08-21 19:05:36,399 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-21 19:05:36,402 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-08-21 19:05:36,402 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-21 19:05:36,403 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-08-21 19:05:36,403 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 31 [2020-08-21 19:05:36,403 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:05:36,404 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-08-21 19:05:36,404 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-21 19:05:36,404 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-08-21 19:05:36,405 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-21 19:05:36,405 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:05:36,405 INFO L422 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:05:36,405 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 19:05:36,406 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:05:36,406 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:05:36,406 INFO L82 PathProgramCache]: Analyzing trace with hash 1006526058, now seen corresponding path program 7 times [2020-08-21 19:05:36,406 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:05:36,406 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1284366060] [2020-08-21 19:05:36,406 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:05:36,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:36,919 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:05:36,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:36,925 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:05:36,925 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1284366060] [2020-08-21 19:05:36,925 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:05:36,925 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-21 19:05:36,925 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [250469066] [2020-08-21 19:05:36,926 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-21 19:05:36,926 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:05:36,926 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-21 19:05:36,927 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2020-08-21 19:05:36,927 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 19 states. [2020-08-21 19:05:58,274 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:05:58,275 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-08-21 19:05:58,275 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-21 19:05:58,275 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 34 [2020-08-21 19:05:58,276 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:05:58,276 INFO L225 Difference]: With dead ends: 44 [2020-08-21 19:05:58,276 INFO L226 Difference]: Without dead ends: 38 [2020-08-21 19:05:58,277 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 10.9s TimeCoverageRelationStatistics Valid=49, Invalid=408, Unknown=5, NotChecked=0, Total=462 [2020-08-21 19:05:58,278 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-21 19:05:58,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-08-21 19:05:58,281 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-21 19:05:58,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2020-08-21 19:05:58,282 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 34 [2020-08-21 19:05:58,282 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:05:58,282 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2020-08-21 19:05:58,283 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-21 19:05:58,283 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2020-08-21 19:05:58,284 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-21 19:05:58,284 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:05:58,284 INFO L422 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:05:58,284 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 19:05:58,284 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:05:58,285 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:05:58,285 INFO L82 PathProgramCache]: Analyzing trace with hash -732241141, now seen corresponding path program 8 times [2020-08-21 19:05:58,285 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:05:58,285 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1537200092] [2020-08-21 19:05:58,285 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:05:58,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:58,899 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:05:58,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:05:58,906 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:05:58,907 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1537200092] [2020-08-21 19:05:58,907 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:05:58,907 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-21 19:05:58,907 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1842263410] [2020-08-21 19:05:58,908 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-21 19:05:58,908 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:05:58,908 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-21 19:05:58,909 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=381, Unknown=0, NotChecked=0, Total=420 [2020-08-21 19:05:58,909 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 21 states. [2020-08-21 19:05:59,382 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:05:59,383 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2020-08-21 19:05:59,383 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-21 19:05:59,384 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 37 [2020-08-21 19:05:59,384 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:05:59,385 INFO L225 Difference]: With dead ends: 47 [2020-08-21 19:05:59,385 INFO L226 Difference]: Without dead ends: 41 [2020-08-21 19:05:59,386 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=53, Invalid=499, Unknown=0, NotChecked=0, Total=552 [2020-08-21 19:05:59,386 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-21 19:05:59,389 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-21 19:05:59,389 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-21 19:05:59,390 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-08-21 19:05:59,390 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 37 [2020-08-21 19:05:59,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:05:59,390 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-08-21 19:05:59,390 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-21 19:05:59,391 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-08-21 19:05:59,392 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-21 19:05:59,392 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:05:59,392 INFO L422 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:05:59,392 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 19:05:59,392 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:05:59,393 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:05:59,393 INFO L82 PathProgramCache]: Analyzing trace with hash 1254690506, now seen corresponding path program 9 times [2020-08-21 19:05:59,393 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:05:59,393 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1685959771] [2020-08-21 19:05:59,393 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:05:59,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:06:00,165 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:06:00,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:06:00,171 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:06:00,172 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1685959771] [2020-08-21 19:06:00,172 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:06:00,172 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-21 19:06:00,172 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [74169912] [2020-08-21 19:06:00,173 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-21 19:06:00,173 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:06:00,173 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-21 19:06:00,174 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=463, Unknown=0, NotChecked=0, Total=506 [2020-08-21 19:06:00,174 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 23 states. [2020-08-21 19:06:13,169 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:06:13,170 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-08-21 19:06:13,170 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-21 19:06:13,170 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 40 [2020-08-21 19:06:13,170 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:06:13,171 INFO L225 Difference]: With dead ends: 50 [2020-08-21 19:06:13,171 INFO L226 Difference]: Without dead ends: 44 [2020-08-21 19:06:13,173 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 11.2s TimeCoverageRelationStatistics Valid=57, Invalid=588, Unknown=5, NotChecked=0, Total=650 [2020-08-21 19:06:13,173 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-21 19:06:13,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-08-21 19:06:13,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-21 19:06:13,177 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2020-08-21 19:06:13,177 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 40 [2020-08-21 19:06:13,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:06:13,177 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2020-08-21 19:06:13,178 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-21 19:06:13,178 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2020-08-21 19:06:13,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-21 19:06:13,179 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:06:13,179 INFO L422 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 19:06:13,180 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 19:06:13,180 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:06:13,180 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:06:13,180 INFO L82 PathProgramCache]: Analyzing trace with hash 696112811, now seen corresponding path program 10 times [2020-08-21 19:06:13,180 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:06:13,181 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1885347220] [2020-08-21 19:06:13,181 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:06:13,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:06:13,984 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:06:13,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:06:13,992 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 19:06:13,992 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1885347220] [2020-08-21 19:06:13,993 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:06:13,993 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-21 19:06:13,994 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [545269421] [2020-08-21 19:06:13,994 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-21 19:06:13,994 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:06:13,994 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-21 19:06:13,995 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=553, Unknown=0, NotChecked=0, Total=600 [2020-08-21 19:06:13,995 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 25 states.