/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5 --traceabstraction.additional.smt.options interpolation-heuristic=WIDESTAMONGSMALL --traceabstraction.additional.smt.options tolerance=0.4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/heavy-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-19 00:27:28,708 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-19 00:27:28,711 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-19 00:27:28,755 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-19 00:27:28,755 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-19 00:27:28,765 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-19 00:27:28,767 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-19 00:27:28,770 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-19 00:27:28,773 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-19 00:27:28,776 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-19 00:27:28,777 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-19 00:27:28,778 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-19 00:27:28,779 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-19 00:27:28,781 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-19 00:27:28,784 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-19 00:27:28,786 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-19 00:27:28,787 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-19 00:27:28,788 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-19 00:27:28,790 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-19 00:27:28,799 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-19 00:27:28,801 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-19 00:27:28,803 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-19 00:27:28,804 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-19 00:27:28,804 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-19 00:27:28,816 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-19 00:27:28,834 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-19 00:27:28,834 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-19 00:27:28,837 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-19 00:27:28,838 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 [2020-08-19 00:27:28,868 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-19 00:27:28,868 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-19 00:27:28,869 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-19 00:27:28,870 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-19 00:27:28,870 INFO L138 SettingsManager]: * Use SBE=true [2020-08-19 00:27:28,870 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-19 00:27:28,870 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-19 00:27:28,870 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-19 00:27:28,871 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-19 00:27:28,871 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-19 00:27:28,871 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-19 00:27:28,871 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-19 00:27:28,871 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-19 00:27:28,872 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-19 00:27:28,872 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-19 00:27:28,872 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-19 00:27:28,872 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-19 00:27:28,873 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-19 00:27:28,873 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-19 00:27:28,873 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-19 00:27:28,873 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-19 00:27:28,873 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-19 00:27:28,873 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-19 00:27:28,874 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-19 00:27:28,874 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-19 00:27:28,874 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-19 00:27:28,874 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-19 00:27:28,874 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-19 00:27:28,875 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-19 00:27:28,875 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.4; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.4; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.4; [2020-08-19 00:27:29,152 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-19 00:27:29,164 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-19 00:27:29,168 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-19 00:27:29,170 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-19 00:27:29,170 INFO L275 PluginConnector]: CDTParser initialized [2020-08-19 00:27:29,171 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/heavy-2.c [2020-08-19 00:27:29,242 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/99011eb2a/9d72b0802a2c4ad696687f31f0657d6f/FLAG7451530eb [2020-08-19 00:27:29,695 INFO L306 CDTParser]: Found 1 translation units. [2020-08-19 00:27:29,696 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loops/heavy-2.c [2020-08-19 00:27:29,702 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/99011eb2a/9d72b0802a2c4ad696687f31f0657d6f/FLAG7451530eb [2020-08-19 00:27:30,078 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/99011eb2a/9d72b0802a2c4ad696687f31f0657d6f [2020-08-19 00:27:30,088 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-19 00:27:30,090 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-19 00:27:30,093 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-19 00:27:30,094 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-19 00:27:30,097 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-19 00:27:30,098 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 12:27:30" (1/1) ... [2020-08-19 00:27:30,102 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6fcb8091 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 12:27:30, skipping insertion in model container [2020-08-19 00:27:30,102 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 12:27:30" (1/1) ... [2020-08-19 00:27:30,111 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-19 00:27:30,132 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-19 00:27:30,338 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 00:27:30,436 INFO L203 MainTranslator]: Completed pre-run [2020-08-19 00:27:30,466 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 00:27:30,561 INFO L208 MainTranslator]: Completed translation [2020-08-19 00:27:30,562 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 12:27:30 WrapperNode [2020-08-19 00:27:30,563 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-19 00:27:30,564 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-19 00:27:30,564 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-19 00:27:30,564 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-19 00:27:30,647 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 12:27:30" (1/1) ... [2020-08-19 00:27:30,649 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 12:27:30" (1/1) ... [2020-08-19 00:27:30,657 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 12:27:30" (1/1) ... [2020-08-19 00:27:30,658 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 12:27:30" (1/1) ... [2020-08-19 00:27:30,671 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 12:27:30" (1/1) ... [2020-08-19 00:27:30,683 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 12:27:30" (1/1) ... [2020-08-19 00:27:30,685 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 12:27:30" (1/1) ... [2020-08-19 00:27:30,687 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-19 00:27:30,687 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-19 00:27:30,687 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-19 00:27:30,688 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-19 00:27:30,688 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 12:27:30" (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 [2020-08-19 00:27:30,746 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-19 00:27:30,747 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-19 00:27:30,747 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-19 00:27:30,747 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-19 00:27:30,747 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-19 00:27:30,747 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-19 00:27:30,748 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-19 00:27:30,748 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-19 00:27:30,748 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-19 00:27:30,748 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~int [2020-08-19 00:27:30,748 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-19 00:27:30,748 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-19 00:27:31,052 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-19 00:27:31,052 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-19 00:27:31,056 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 12:27:31 BoogieIcfgContainer [2020-08-19 00:27:31,056 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-19 00:27:31,057 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-19 00:27:31,057 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-19 00:27:31,060 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-19 00:27:31,061 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.08 12:27:30" (1/3) ... [2020-08-19 00:27:31,061 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@447919f7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 12:27:31, skipping insertion in model container [2020-08-19 00:27:31,062 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 12:27:30" (2/3) ... [2020-08-19 00:27:31,062 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@447919f7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 12:27:31, skipping insertion in model container [2020-08-19 00:27:31,062 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 12:27:31" (3/3) ... [2020-08-19 00:27:31,064 INFO L109 eAbstractionObserver]: Analyzing ICFG heavy-2.c [2020-08-19 00:27:31,075 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-19 00:27:31,083 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-19 00:27:31,098 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-19 00:27:31,119 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-19 00:27:31,120 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-19 00:27:31,120 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-19 00:27:31,120 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-19 00:27:31,120 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-19 00:27:31,121 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-19 00:27:31,121 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-19 00:27:31,121 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-19 00:27:31,139 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2020-08-19 00:27:31,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-08-19 00:27:31,145 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:27:31,147 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 00:27:31,147 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:27:31,153 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:27:31,154 INFO L82 PathProgramCache]: Analyzing trace with hash 242978043, now seen corresponding path program 1 times [2020-08-19 00:27:31,163 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:27:31,164 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1876333742] [2020-08-19 00:27:31,164 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:27:31,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:31,355 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:27:31,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:31,372 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 00:27:31,373 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1876333742] [2020-08-19 00:27:31,375 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 00:27:31,375 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-19 00:27:31,376 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1308637542] [2020-08-19 00:27:31,380 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-19 00:27:31,381 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:27:31,391 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-19 00:27:31,392 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-19 00:27:31,394 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 3 states. [2020-08-19 00:27:31,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:27:31,504 INFO L93 Difference]: Finished difference Result 42 states and 61 transitions. [2020-08-19 00:27:31,504 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-19 00:27:31,506 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 9 [2020-08-19 00:27:31,506 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:27:31,515 INFO L225 Difference]: With dead ends: 42 [2020-08-19 00:27:31,516 INFO L226 Difference]: Without dead ends: 23 [2020-08-19 00:27:31,519 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-19 00:27:31,534 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-19 00:27:31,549 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 15. [2020-08-19 00:27:31,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-19 00:27:31,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-08-19 00:27:31,553 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 9 [2020-08-19 00:27:31,553 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:27:31,553 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-08-19 00:27:31,553 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-19 00:27:31,553 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-08-19 00:27:31,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-08-19 00:27:31,554 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:27:31,554 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 00:27:31,555 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-19 00:27:31,555 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:27:31,555 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:27:31,555 INFO L82 PathProgramCache]: Analyzing trace with hash 242949213, now seen corresponding path program 1 times [2020-08-19 00:27:31,556 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:27:31,556 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1012622135] [2020-08-19 00:27:31,556 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:27:31,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:31,637 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:27:31,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:31,649 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 00:27:31,650 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1012622135] [2020-08-19 00:27:31,650 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 00:27:31,650 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-19 00:27:31,651 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1185069157] [2020-08-19 00:27:31,652 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-19 00:27:31,653 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:27:31,653 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-19 00:27:31,653 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-19 00:27:31,653 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 4 states. [2020-08-19 00:27:31,754 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:27:31,754 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-08-19 00:27:31,755 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-19 00:27:31,755 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 9 [2020-08-19 00:27:31,755 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:27:31,756 INFO L225 Difference]: With dead ends: 36 [2020-08-19 00:27:31,756 INFO L226 Difference]: Without dead ends: 33 [2020-08-19 00:27:31,758 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-19 00:27:31,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-19 00:27:31,763 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 16. [2020-08-19 00:27:31,764 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-19 00:27:31,764 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-08-19 00:27:31,765 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 9 [2020-08-19 00:27:31,765 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:27:31,765 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-08-19 00:27:31,765 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-19 00:27:31,766 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-08-19 00:27:31,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-19 00:27:31,766 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:27:31,766 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 00:27:31,767 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-19 00:27:31,767 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:27:31,767 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:27:31,767 INFO L82 PathProgramCache]: Analyzing trace with hash 713101374, now seen corresponding path program 1 times [2020-08-19 00:27:31,768 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:27:31,768 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1927491635] [2020-08-19 00:27:31,768 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:27:31,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:31,832 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:27:31,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:31,843 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 00:27:31,844 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1927491635] [2020-08-19 00:27:31,844 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 00:27:31,844 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-19 00:27:31,844 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1580263911] [2020-08-19 00:27:31,845 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-19 00:27:31,845 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:27:31,845 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-19 00:27:31,846 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-19 00:27:31,846 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 4 states. [2020-08-19 00:27:31,952 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:27:31,952 INFO L93 Difference]: Finished difference Result 40 states and 50 transitions. [2020-08-19 00:27:31,953 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-19 00:27:31,953 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 12 [2020-08-19 00:27:31,954 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:27:31,954 INFO L225 Difference]: With dead ends: 40 [2020-08-19 00:27:31,955 INFO L226 Difference]: Without dead ends: 31 [2020-08-19 00:27:31,955 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-19 00:27:31,956 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-19 00:27:31,961 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 17. [2020-08-19 00:27:31,961 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-19 00:27:31,962 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2020-08-19 00:27:31,962 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 12 [2020-08-19 00:27:31,963 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:27:31,963 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2020-08-19 00:27:31,963 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-19 00:27:31,963 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2020-08-19 00:27:31,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-19 00:27:31,964 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:27:31,964 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 00:27:31,965 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-19 00:27:31,965 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:27:31,965 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:27:31,966 INFO L82 PathProgramCache]: Analyzing trace with hash -1111837415, now seen corresponding path program 1 times [2020-08-19 00:27:31,966 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:27:31,966 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1840037690] [2020-08-19 00:27:31,967 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:27:31,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:32,030 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:27:32,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:32,040 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 00:27:32,040 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1840037690] [2020-08-19 00:27:32,041 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 00:27:32,041 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-19 00:27:32,041 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [160738801] [2020-08-19 00:27:32,042 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-19 00:27:32,042 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:27:32,042 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-19 00:27:32,043 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-19 00:27:32,043 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand 4 states. [2020-08-19 00:27:32,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:27:32,112 INFO L93 Difference]: Finished difference Result 31 states and 37 transitions. [2020-08-19 00:27:32,113 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-19 00:27:32,113 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 15 [2020-08-19 00:27:32,114 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:27:32,114 INFO L225 Difference]: With dead ends: 31 [2020-08-19 00:27:32,114 INFO L226 Difference]: Without dead ends: 21 [2020-08-19 00:27:32,115 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-19 00:27:32,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-19 00:27:32,120 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 18. [2020-08-19 00:27:32,120 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-19 00:27:32,121 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2020-08-19 00:27:32,122 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 15 [2020-08-19 00:27:32,122 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:27:32,122 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2020-08-19 00:27:32,122 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-19 00:27:32,122 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2020-08-19 00:27:32,123 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-19 00:27:32,123 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:27:32,124 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 00:27:32,124 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-19 00:27:32,124 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:27:32,124 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:27:32,125 INFO L82 PathProgramCache]: Analyzing trace with hash 1672606071, now seen corresponding path program 1 times [2020-08-19 00:27:32,125 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:27:32,125 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [781963361] [2020-08-19 00:27:32,126 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:27:32,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:32,295 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:27:32,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:32,311 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 00:27:32,318 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [781963361] [2020-08-19 00:27:32,318 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 00:27:32,319 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-19 00:27:32,319 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1067164479] [2020-08-19 00:27:32,319 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-19 00:27:32,320 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:27:32,320 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-19 00:27:32,321 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-19 00:27:32,322 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 5 states. [2020-08-19 00:27:32,416 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:27:32,416 INFO L93 Difference]: Finished difference Result 34 states and 39 transitions. [2020-08-19 00:27:32,417 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-19 00:27:32,418 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2020-08-19 00:27:32,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:27:32,419 INFO L225 Difference]: With dead ends: 34 [2020-08-19 00:27:32,419 INFO L226 Difference]: Without dead ends: 23 [2020-08-19 00:27:32,420 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2020-08-19 00:27:32,421 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-19 00:27:32,425 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 20. [2020-08-19 00:27:32,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-19 00:27:32,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2020-08-19 00:27:32,427 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 17 [2020-08-19 00:27:32,427 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:27:32,427 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2020-08-19 00:27:32,427 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-19 00:27:32,428 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2020-08-19 00:27:32,428 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-19 00:27:32,428 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:27:32,429 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 00:27:32,429 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-19 00:27:32,429 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:27:32,430 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:27:32,430 INFO L82 PathProgramCache]: Analyzing trace with hash 1758170709, now seen corresponding path program 2 times [2020-08-19 00:27:32,430 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:27:32,431 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1156750239] [2020-08-19 00:27:32,431 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:27:32,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:32,603 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:27:32,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:32,615 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 00:27:32,617 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1156750239] [2020-08-19 00:27:32,618 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 00:27:32,618 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-19 00:27:32,619 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1021366586] [2020-08-19 00:27:32,620 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-19 00:27:32,620 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:27:32,620 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-19 00:27:32,620 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-19 00:27:32,621 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 6 states. [2020-08-19 00:27:32,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:27:32,740 INFO L93 Difference]: Finished difference Result 38 states and 43 transitions. [2020-08-19 00:27:32,740 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-19 00:27:32,740 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2020-08-19 00:27:32,741 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:27:32,741 INFO L225 Difference]: With dead ends: 38 [2020-08-19 00:27:32,741 INFO L226 Difference]: Without dead ends: 25 [2020-08-19 00:27:32,743 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2020-08-19 00:27:32,743 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-19 00:27:32,750 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 22. [2020-08-19 00:27:32,751 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-19 00:27:32,752 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2020-08-19 00:27:32,752 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 19 [2020-08-19 00:27:32,752 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:27:32,752 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2020-08-19 00:27:32,753 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-19 00:27:32,753 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2020-08-19 00:27:32,753 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-19 00:27:32,753 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:27:32,754 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 00:27:32,754 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-19 00:27:32,754 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:27:32,754 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:27:32,755 INFO L82 PathProgramCache]: Analyzing trace with hash -1913558093, now seen corresponding path program 3 times [2020-08-19 00:27:32,755 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:27:32,755 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [378724137] [2020-08-19 00:27:32,755 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:27:32,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:32,883 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:27:32,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:32,896 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 00:27:32,897 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [378724137] [2020-08-19 00:27:32,897 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 00:27:32,897 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-19 00:27:32,898 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [48498047] [2020-08-19 00:27:32,899 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-19 00:27:32,899 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:27:32,899 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-19 00:27:32,900 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-08-19 00:27:32,901 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand 7 states. [2020-08-19 00:27:33,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:27:33,009 INFO L93 Difference]: Finished difference Result 42 states and 47 transitions. [2020-08-19 00:27:33,010 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-19 00:27:33,010 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 21 [2020-08-19 00:27:33,010 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:27:33,011 INFO L225 Difference]: With dead ends: 42 [2020-08-19 00:27:33,011 INFO L226 Difference]: Without dead ends: 27 [2020-08-19 00:27:33,011 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-08-19 00:27:33,012 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-08-19 00:27:33,016 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 24. [2020-08-19 00:27:33,017 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-19 00:27:33,017 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2020-08-19 00:27:33,018 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 21 [2020-08-19 00:27:33,018 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:27:33,018 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2020-08-19 00:27:33,018 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-19 00:27:33,018 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2020-08-19 00:27:33,019 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-08-19 00:27:33,019 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:27:33,019 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 00:27:33,020 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-19 00:27:33,020 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:27:33,020 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:27:33,020 INFO L82 PathProgramCache]: Analyzing trace with hash 18180497, now seen corresponding path program 4 times [2020-08-19 00:27:33,020 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:27:33,021 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [579684151] [2020-08-19 00:27:33,021 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:27:33,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:33,168 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:27:33,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:33,173 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 00:27:33,174 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [579684151] [2020-08-19 00:27:33,174 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 00:27:33,174 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-19 00:27:33,175 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1155744796] [2020-08-19 00:27:33,175 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-19 00:27:33,175 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:27:33,176 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-19 00:27:33,176 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-08-19 00:27:33,176 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 8 states. [2020-08-19 00:27:33,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:27:33,302 INFO L93 Difference]: Finished difference Result 46 states and 51 transitions. [2020-08-19 00:27:33,302 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-19 00:27:33,303 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 23 [2020-08-19 00:27:33,303 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:27:33,304 INFO L225 Difference]: With dead ends: 46 [2020-08-19 00:27:33,304 INFO L226 Difference]: Without dead ends: 29 [2020-08-19 00:27:33,304 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-08-19 00:27:33,305 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-19 00:27:33,309 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 26. [2020-08-19 00:27:33,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-19 00:27:33,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2020-08-19 00:27:33,310 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 23 [2020-08-19 00:27:33,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:27:33,311 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2020-08-19 00:27:33,311 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-19 00:27:33,311 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2020-08-19 00:27:33,312 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-19 00:27:33,312 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:27:33,312 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 00:27:33,312 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-19 00:27:33,312 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:27:33,313 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:27:33,313 INFO L82 PathProgramCache]: Analyzing trace with hash 993093615, now seen corresponding path program 5 times [2020-08-19 00:27:33,313 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:27:33,313 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [780806597] [2020-08-19 00:27:33,313 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:27:33,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:33,446 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:27:33,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:33,452 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 00:27:33,453 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [780806597] [2020-08-19 00:27:33,453 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 00:27:33,454 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-19 00:27:33,454 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1661191508] [2020-08-19 00:27:33,455 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-19 00:27:33,455 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:27:33,455 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-19 00:27:33,455 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2020-08-19 00:27:33,456 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 9 states. [2020-08-19 00:27:33,611 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:27:33,611 INFO L93 Difference]: Finished difference Result 50 states and 55 transitions. [2020-08-19 00:27:33,611 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-19 00:27:33,612 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 25 [2020-08-19 00:27:33,612 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:27:33,612 INFO L225 Difference]: With dead ends: 50 [2020-08-19 00:27:33,613 INFO L226 Difference]: Without dead ends: 31 [2020-08-19 00:27:33,613 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2020-08-19 00:27:33,614 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-19 00:27:33,618 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2020-08-19 00:27:33,618 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-19 00:27:33,619 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2020-08-19 00:27:33,619 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 25 [2020-08-19 00:27:33,620 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:27:33,620 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2020-08-19 00:27:33,620 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-19 00:27:33,620 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2020-08-19 00:27:33,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-19 00:27:33,621 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:27:33,621 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 00:27:33,621 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-19 00:27:33,622 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:27:33,622 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:27:33,622 INFO L82 PathProgramCache]: Analyzing trace with hash 1581729485, now seen corresponding path program 6 times [2020-08-19 00:27:33,622 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:27:33,623 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [321355408] [2020-08-19 00:27:33,623 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:27:33,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:33,787 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:27:33,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:33,792 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 2 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 00:27:33,793 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [321355408] [2020-08-19 00:27:33,793 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 00:27:33,793 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-19 00:27:33,794 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [499541805] [2020-08-19 00:27:33,794 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-19 00:27:33,794 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:27:33,794 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-19 00:27:33,795 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2020-08-19 00:27:33,795 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 10 states. [2020-08-19 00:27:33,961 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:27:33,961 INFO L93 Difference]: Finished difference Result 54 states and 59 transitions. [2020-08-19 00:27:33,962 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-19 00:27:33,962 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-08-19 00:27:33,962 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:27:33,963 INFO L225 Difference]: With dead ends: 54 [2020-08-19 00:27:33,963 INFO L226 Difference]: Without dead ends: 33 [2020-08-19 00:27:33,964 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2020-08-19 00:27:33,964 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-19 00:27:33,968 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 30. [2020-08-19 00:27:33,969 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-19 00:27:33,969 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2020-08-19 00:27:33,970 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 27 [2020-08-19 00:27:33,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:27:33,970 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2020-08-19 00:27:33,970 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-19 00:27:33,970 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2020-08-19 00:27:33,971 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-19 00:27:33,971 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:27:33,971 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 00:27:33,972 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-19 00:27:33,972 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:27:33,972 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:27:33,972 INFO L82 PathProgramCache]: Analyzing trace with hash 325117483, now seen corresponding path program 7 times [2020-08-19 00:27:33,972 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:27:33,973 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1341417677] [2020-08-19 00:27:33,973 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:27:33,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:34,133 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:27:34,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:34,138 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 2 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 00:27:34,139 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1341417677] [2020-08-19 00:27:34,139 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 00:27:34,139 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-19 00:27:34,139 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [434360048] [2020-08-19 00:27:34,140 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-19 00:27:34,140 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:27:34,140 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-19 00:27:34,140 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2020-08-19 00:27:34,141 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand 11 states. [2020-08-19 00:27:34,352 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:27:34,352 INFO L93 Difference]: Finished difference Result 58 states and 63 transitions. [2020-08-19 00:27:34,353 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-19 00:27:34,353 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 29 [2020-08-19 00:27:34,353 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:27:34,354 INFO L225 Difference]: With dead ends: 58 [2020-08-19 00:27:34,354 INFO L226 Difference]: Without dead ends: 35 [2020-08-19 00:27:34,355 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2020-08-19 00:27:34,355 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-19 00:27:34,359 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 32. [2020-08-19 00:27:34,360 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-19 00:27:34,360 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2020-08-19 00:27:34,360 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 29 [2020-08-19 00:27:34,361 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:27:34,361 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2020-08-19 00:27:34,361 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-19 00:27:34,361 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2020-08-19 00:27:34,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-19 00:27:34,362 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:27:34,362 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 00:27:34,362 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-19 00:27:34,362 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:27:34,363 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:27:34,363 INFO L82 PathProgramCache]: Analyzing trace with hash -393206263, now seen corresponding path program 8 times [2020-08-19 00:27:34,363 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:27:34,363 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1132013403] [2020-08-19 00:27:34,363 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:27:34,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:34,532 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:27:34,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:34,537 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 2 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 00:27:34,538 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1132013403] [2020-08-19 00:27:34,538 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 00:27:34,538 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-19 00:27:34,538 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1029989647] [2020-08-19 00:27:34,539 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-19 00:27:34,539 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:27:34,539 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-19 00:27:34,539 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2020-08-19 00:27:34,539 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand 12 states. [2020-08-19 00:27:34,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:27:34,783 INFO L93 Difference]: Finished difference Result 62 states and 67 transitions. [2020-08-19 00:27:34,783 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-19 00:27:34,783 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 31 [2020-08-19 00:27:34,784 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:27:34,784 INFO L225 Difference]: With dead ends: 62 [2020-08-19 00:27:34,784 INFO L226 Difference]: Without dead ends: 37 [2020-08-19 00:27:34,785 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2020-08-19 00:27:34,786 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-19 00:27:34,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 34. [2020-08-19 00:27:34,792 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-19 00:27:34,792 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 36 transitions. [2020-08-19 00:27:34,805 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 36 transitions. Word has length 31 [2020-08-19 00:27:34,806 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:27:34,806 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 36 transitions. [2020-08-19 00:27:34,806 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-19 00:27:34,806 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 36 transitions. [2020-08-19 00:27:34,806 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-19 00:27:34,807 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:27:34,807 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 00:27:34,807 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-19 00:27:34,807 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:27:34,807 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:27:34,808 INFO L82 PathProgramCache]: Analyzing trace with hash 787408487, now seen corresponding path program 9 times [2020-08-19 00:27:34,808 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:27:34,808 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [430390768] [2020-08-19 00:27:34,808 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:27:34,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:35,020 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:27:35,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:35,026 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 2 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 00:27:35,026 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [430390768] [2020-08-19 00:27:35,026 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 00:27:35,027 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-19 00:27:35,027 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [202040281] [2020-08-19 00:27:35,027 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-19 00:27:35,027 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:27:35,028 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-19 00:27:35,028 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2020-08-19 00:27:35,028 INFO L87 Difference]: Start difference. First operand 34 states and 36 transitions. Second operand 13 states. [2020-08-19 00:27:35,301 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:27:35,301 INFO L93 Difference]: Finished difference Result 66 states and 71 transitions. [2020-08-19 00:27:35,302 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-19 00:27:35,302 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 33 [2020-08-19 00:27:35,302 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:27:35,303 INFO L225 Difference]: With dead ends: 66 [2020-08-19 00:27:35,303 INFO L226 Difference]: Without dead ends: 39 [2020-08-19 00:27:35,304 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2020-08-19 00:27:35,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-19 00:27:35,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 36. [2020-08-19 00:27:35,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-19 00:27:35,309 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2020-08-19 00:27:35,309 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 33 [2020-08-19 00:27:35,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:27:35,310 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2020-08-19 00:27:35,310 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-19 00:27:35,310 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2020-08-19 00:27:35,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-19 00:27:35,311 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:27:35,311 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 00:27:35,311 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-19 00:27:35,311 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:27:35,312 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:27:35,312 INFO L82 PathProgramCache]: Analyzing trace with hash 1486817093, now seen corresponding path program 10 times [2020-08-19 00:27:35,312 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:27:35,312 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [149087404] [2020-08-19 00:27:35,312 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:27:35,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:35,548 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:27:35,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:35,557 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 2 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 00:27:35,557 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [149087404] [2020-08-19 00:27:35,557 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 00:27:35,558 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-19 00:27:35,558 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [309601540] [2020-08-19 00:27:35,558 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-19 00:27:35,559 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:27:35,559 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-19 00:27:35,559 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2020-08-19 00:27:35,559 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand 14 states. [2020-08-19 00:27:35,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:27:35,884 INFO L93 Difference]: Finished difference Result 70 states and 75 transitions. [2020-08-19 00:27:35,885 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-19 00:27:35,885 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 35 [2020-08-19 00:27:35,885 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:27:35,886 INFO L225 Difference]: With dead ends: 70 [2020-08-19 00:27:35,886 INFO L226 Difference]: Without dead ends: 41 [2020-08-19 00:27:35,887 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2020-08-19 00:27:35,887 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-19 00:27:35,892 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 38. [2020-08-19 00:27:35,892 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-19 00:27:35,893 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2020-08-19 00:27:35,893 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 35 [2020-08-19 00:27:35,893 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:27:35,893 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2020-08-19 00:27:35,893 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-19 00:27:35,894 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2020-08-19 00:27:35,894 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-19 00:27:35,894 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:27:35,894 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 00:27:35,895 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-19 00:27:35,895 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:27:35,895 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:27:35,895 INFO L82 PathProgramCache]: Analyzing trace with hash -691378013, now seen corresponding path program 11 times [2020-08-19 00:27:35,895 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:27:35,896 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [758997568] [2020-08-19 00:27:35,896 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:27:35,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:36,194 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:27:36,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:36,199 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 2 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 00:27:36,200 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [758997568] [2020-08-19 00:27:36,200 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 00:27:36,200 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-19 00:27:36,200 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2130521702] [2020-08-19 00:27:36,201 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-19 00:27:36,201 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:27:36,201 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-19 00:27:36,202 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2020-08-19 00:27:36,202 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand 15 states. [2020-08-19 00:27:36,588 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:27:36,588 INFO L93 Difference]: Finished difference Result 74 states and 79 transitions. [2020-08-19 00:27:36,589 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-19 00:27:36,589 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 37 [2020-08-19 00:27:36,589 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:27:36,591 INFO L225 Difference]: With dead ends: 74 [2020-08-19 00:27:36,591 INFO L226 Difference]: Without dead ends: 43 [2020-08-19 00:27:36,592 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=43, Invalid=197, Unknown=0, NotChecked=0, Total=240 [2020-08-19 00:27:36,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-19 00:27:36,600 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 40. [2020-08-19 00:27:36,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-19 00:27:36,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2020-08-19 00:27:36,602 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 37 [2020-08-19 00:27:36,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:27:36,603 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2020-08-19 00:27:36,603 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-19 00:27:36,603 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2020-08-19 00:27:36,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-19 00:27:36,604 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:27:36,604 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 00:27:36,605 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-19 00:27:36,605 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:27:36,605 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:27:36,605 INFO L82 PathProgramCache]: Analyzing trace with hash 2007165569, now seen corresponding path program 12 times [2020-08-19 00:27:36,605 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:27:36,607 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1006685527] [2020-08-19 00:27:36,607 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:27:36,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:36,887 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:27:36,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:36,894 INFO L134 CoverageAnalysis]: Checked inductivity of 146 backedges. 2 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 00:27:36,894 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1006685527] [2020-08-19 00:27:36,894 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 00:27:36,895 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-19 00:27:36,895 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1913013263] [2020-08-19 00:27:36,896 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-19 00:27:36,896 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:27:36,896 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-19 00:27:36,897 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2020-08-19 00:27:36,897 INFO L87 Difference]: Start difference. First operand 40 states and 42 transitions. Second operand 16 states. [2020-08-19 00:27:37,262 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:27:37,262 INFO L93 Difference]: Finished difference Result 78 states and 83 transitions. [2020-08-19 00:27:37,262 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-19 00:27:37,263 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 39 [2020-08-19 00:27:37,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:27:37,264 INFO L225 Difference]: With dead ends: 78 [2020-08-19 00:27:37,264 INFO L226 Difference]: Without dead ends: 45 [2020-08-19 00:27:37,264 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=46, Invalid=226, Unknown=0, NotChecked=0, Total=272 [2020-08-19 00:27:37,265 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-19 00:27:37,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 42. [2020-08-19 00:27:37,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-19 00:27:37,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 44 transitions. [2020-08-19 00:27:37,270 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 44 transitions. Word has length 39 [2020-08-19 00:27:37,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:27:37,270 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 44 transitions. [2020-08-19 00:27:37,270 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-19 00:27:37,271 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 44 transitions. [2020-08-19 00:27:37,271 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-19 00:27:37,271 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:27:37,271 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 00:27:37,272 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-19 00:27:37,272 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:27:37,272 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:27:37,272 INFO L82 PathProgramCache]: Analyzing trace with hash 1147301087, now seen corresponding path program 13 times [2020-08-19 00:27:37,272 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:27:37,273 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1887113913] [2020-08-19 00:27:37,273 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:27:37,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:37,558 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:27:37,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:37,565 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 2 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 00:27:37,566 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1887113913] [2020-08-19 00:27:37,566 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 00:27:37,566 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-19 00:27:37,566 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [407918019] [2020-08-19 00:27:37,567 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-19 00:27:37,568 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:27:37,568 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-19 00:27:37,569 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2020-08-19 00:27:37,569 INFO L87 Difference]: Start difference. First operand 42 states and 44 transitions. Second operand 17 states. [2020-08-19 00:27:37,948 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:27:37,948 INFO L93 Difference]: Finished difference Result 82 states and 87 transitions. [2020-08-19 00:27:37,949 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-19 00:27:37,949 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 41 [2020-08-19 00:27:37,949 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:27:37,950 INFO L225 Difference]: With dead ends: 82 [2020-08-19 00:27:37,950 INFO L226 Difference]: Without dead ends: 47 [2020-08-19 00:27:37,950 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2020-08-19 00:27:37,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-19 00:27:37,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 44. [2020-08-19 00:27:37,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-19 00:27:37,956 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2020-08-19 00:27:37,956 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 41 [2020-08-19 00:27:37,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:27:37,956 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2020-08-19 00:27:37,956 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-19 00:27:37,956 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2020-08-19 00:27:37,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-19 00:27:37,957 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:27:37,957 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 00:27:37,957 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-19 00:27:37,958 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:27:37,958 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:27:37,958 INFO L82 PathProgramCache]: Analyzing trace with hash -548745283, now seen corresponding path program 14 times [2020-08-19 00:27:37,958 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:27:37,958 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [511945286] [2020-08-19 00:27:37,959 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:27:37,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:38,273 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:27:38,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:38,280 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 2 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 00:27:38,280 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [511945286] [2020-08-19 00:27:38,280 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 00:27:38,281 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-19 00:27:38,281 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1856762807] [2020-08-19 00:27:38,281 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-19 00:27:38,281 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:27:38,282 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-19 00:27:38,282 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2020-08-19 00:27:38,282 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand 18 states. [2020-08-19 00:27:38,784 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:27:38,784 INFO L93 Difference]: Finished difference Result 86 states and 91 transitions. [2020-08-19 00:27:38,785 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-19 00:27:38,785 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 43 [2020-08-19 00:27:38,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:27:38,786 INFO L225 Difference]: With dead ends: 86 [2020-08-19 00:27:38,786 INFO L226 Difference]: Without dead ends: 49 [2020-08-19 00:27:38,787 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=52, Invalid=290, Unknown=0, NotChecked=0, Total=342 [2020-08-19 00:27:38,788 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-19 00:27:38,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 46. [2020-08-19 00:27:38,792 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-19 00:27:38,793 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 48 transitions. [2020-08-19 00:27:38,793 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 48 transitions. Word has length 43 [2020-08-19 00:27:38,793 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:27:38,793 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 48 transitions. [2020-08-19 00:27:38,794 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-19 00:27:38,794 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 48 transitions. [2020-08-19 00:27:38,794 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-19 00:27:38,794 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:27:38,794 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 00:27:38,795 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-19 00:27:38,795 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:27:38,795 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:27:38,795 INFO L82 PathProgramCache]: Analyzing trace with hash 1638265627, now seen corresponding path program 15 times [2020-08-19 00:27:38,796 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:27:38,796 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [313706423] [2020-08-19 00:27:38,796 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:27:38,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:39,179 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:27:39,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:39,189 INFO L134 CoverageAnalysis]: Checked inductivity of 227 backedges. 2 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 00:27:39,189 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [313706423] [2020-08-19 00:27:39,190 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 00:27:39,190 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-19 00:27:39,190 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [20247485] [2020-08-19 00:27:39,191 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-19 00:27:39,191 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:27:39,192 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-19 00:27:39,192 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2020-08-19 00:27:39,192 INFO L87 Difference]: Start difference. First operand 46 states and 48 transitions. Second operand 19 states. [2020-08-19 00:27:39,790 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:27:39,791 INFO L93 Difference]: Finished difference Result 90 states and 95 transitions. [2020-08-19 00:27:39,791 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-19 00:27:39,792 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 45 [2020-08-19 00:27:39,792 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:27:39,792 INFO L225 Difference]: With dead ends: 90 [2020-08-19 00:27:39,792 INFO L226 Difference]: Without dead ends: 51 [2020-08-19 00:27:39,793 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=55, Invalid=325, Unknown=0, NotChecked=0, Total=380 [2020-08-19 00:27:39,793 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-08-19 00:27:39,798 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 48. [2020-08-19 00:27:39,798 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-19 00:27:39,799 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 50 transitions. [2020-08-19 00:27:39,799 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 50 transitions. Word has length 45 [2020-08-19 00:27:39,799 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:27:39,799 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 50 transitions. [2020-08-19 00:27:39,799 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-19 00:27:39,799 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 50 transitions. [2020-08-19 00:27:39,800 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-19 00:27:39,800 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:27:39,800 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 00:27:39,800 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-19 00:27:39,801 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:27:39,801 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:27:39,801 INFO L82 PathProgramCache]: Analyzing trace with hash -1178224903, now seen corresponding path program 16 times [2020-08-19 00:27:39,801 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:27:39,801 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [130596141] [2020-08-19 00:27:39,802 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:27:39,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:40,156 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:27:40,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:40,163 INFO L134 CoverageAnalysis]: Checked inductivity of 258 backedges. 2 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 00:27:40,163 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [130596141] [2020-08-19 00:27:40,164 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 00:27:40,164 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-19 00:27:40,164 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [143872988] [2020-08-19 00:27:40,164 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-19 00:27:40,164 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:27:40,165 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-19 00:27:40,165 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=327, Unknown=0, NotChecked=0, Total=380 [2020-08-19 00:27:40,165 INFO L87 Difference]: Start difference. First operand 48 states and 50 transitions. Second operand 20 states. [2020-08-19 00:27:40,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:27:40,748 INFO L93 Difference]: Finished difference Result 94 states and 99 transitions. [2020-08-19 00:27:40,749 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-19 00:27:40,749 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 47 [2020-08-19 00:27:40,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:27:40,750 INFO L225 Difference]: With dead ends: 94 [2020-08-19 00:27:40,750 INFO L226 Difference]: Without dead ends: 53 [2020-08-19 00:27:40,751 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=58, Invalid=362, Unknown=0, NotChecked=0, Total=420 [2020-08-19 00:27:40,751 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-19 00:27:40,758 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 50. [2020-08-19 00:27:40,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-08-19 00:27:40,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 52 transitions. [2020-08-19 00:27:40,759 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 52 transitions. Word has length 47 [2020-08-19 00:27:40,761 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:27:40,761 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 52 transitions. [2020-08-19 00:27:40,761 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-19 00:27:40,761 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 52 transitions. [2020-08-19 00:27:40,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-08-19 00:27:40,762 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:27:40,762 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 00:27:40,762 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-19 00:27:40,762 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:27:40,762 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:27:40,763 INFO L82 PathProgramCache]: Analyzing trace with hash -1996227753, now seen corresponding path program 17 times [2020-08-19 00:27:40,763 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:27:40,763 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [354961574] [2020-08-19 00:27:40,763 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:27:40,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:41,178 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:27:41,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:41,186 INFO L134 CoverageAnalysis]: Checked inductivity of 291 backedges. 2 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 00:27:41,187 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [354961574] [2020-08-19 00:27:41,187 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 00:27:41,198 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-19 00:27:41,198 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2117360274] [2020-08-19 00:27:41,199 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-19 00:27:41,199 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:27:41,199 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-19 00:27:41,200 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=364, Unknown=0, NotChecked=0, Total=420 [2020-08-19 00:27:41,200 INFO L87 Difference]: Start difference. First operand 50 states and 52 transitions. Second operand 21 states. [2020-08-19 00:27:41,846 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:27:41,846 INFO L93 Difference]: Finished difference Result 98 states and 103 transitions. [2020-08-19 00:27:41,847 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-19 00:27:41,847 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 49 [2020-08-19 00:27:41,847 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:27:41,848 INFO L225 Difference]: With dead ends: 98 [2020-08-19 00:27:41,848 INFO L226 Difference]: Without dead ends: 55 [2020-08-19 00:27:41,848 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=61, Invalid=401, Unknown=0, NotChecked=0, Total=462 [2020-08-19 00:27:41,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-19 00:27:41,853 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 52. [2020-08-19 00:27:41,854 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-19 00:27:41,854 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 54 transitions. [2020-08-19 00:27:41,854 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 54 transitions. Word has length 49 [2020-08-19 00:27:41,856 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:27:41,856 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 54 transitions. [2020-08-19 00:27:41,856 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-19 00:27:41,856 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 54 transitions. [2020-08-19 00:27:41,856 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-08-19 00:27:41,857 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:27:41,857 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 00:27:41,857 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-19 00:27:41,857 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:27:41,857 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:27:41,858 INFO L82 PathProgramCache]: Analyzing trace with hash -2117951435, now seen corresponding path program 18 times [2020-08-19 00:27:41,858 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:27:41,858 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1872450861] [2020-08-19 00:27:41,858 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:27:41,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:42,286 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:27:42,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:42,293 INFO L134 CoverageAnalysis]: Checked inductivity of 326 backedges. 2 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 00:27:42,294 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1872450861] [2020-08-19 00:27:42,294 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 00:27:42,294 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-19 00:27:42,294 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2061782101] [2020-08-19 00:27:42,294 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-19 00:27:42,295 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:27:42,295 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-19 00:27:42,295 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=403, Unknown=0, NotChecked=0, Total=462 [2020-08-19 00:27:42,295 INFO L87 Difference]: Start difference. First operand 52 states and 54 transitions. Second operand 22 states. [2020-08-19 00:27:42,967 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:27:42,967 INFO L93 Difference]: Finished difference Result 102 states and 107 transitions. [2020-08-19 00:27:42,974 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-19 00:27:42,974 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 51 [2020-08-19 00:27:42,974 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:27:42,975 INFO L225 Difference]: With dead ends: 102 [2020-08-19 00:27:42,975 INFO L226 Difference]: Without dead ends: 57 [2020-08-19 00:27:42,976 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=64, Invalid=442, Unknown=0, NotChecked=0, Total=506 [2020-08-19 00:27:42,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-08-19 00:27:42,980 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 54. [2020-08-19 00:27:42,981 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-19 00:27:42,981 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 56 transitions. [2020-08-19 00:27:42,981 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 56 transitions. Word has length 51 [2020-08-19 00:27:42,982 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:27:42,982 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 56 transitions. [2020-08-19 00:27:42,982 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-19 00:27:42,982 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 56 transitions. [2020-08-19 00:27:42,982 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-08-19 00:27:42,982 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:27:42,983 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 00:27:42,983 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-19 00:27:42,983 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:27:42,983 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:27:42,983 INFO L82 PathProgramCache]: Analyzing trace with hash 1164674451, now seen corresponding path program 19 times [2020-08-19 00:27:42,984 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:27:42,984 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2079183410] [2020-08-19 00:27:42,984 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:27:43,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:43,498 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:27:43,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:43,505 INFO L134 CoverageAnalysis]: Checked inductivity of 363 backedges. 2 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 00:27:43,505 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2079183410] [2020-08-19 00:27:43,506 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 00:27:43,506 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-19 00:27:43,506 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [353799852] [2020-08-19 00:27:43,506 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-19 00:27:43,507 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:27:43,507 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-19 00:27:43,507 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=444, Unknown=0, NotChecked=0, Total=506 [2020-08-19 00:27:43,507 INFO L87 Difference]: Start difference. First operand 54 states and 56 transitions. Second operand 23 states. [2020-08-19 00:27:44,219 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:27:44,220 INFO L93 Difference]: Finished difference Result 106 states and 111 transitions. [2020-08-19 00:27:44,225 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-19 00:27:44,225 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 53 [2020-08-19 00:27:44,225 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:27:44,226 INFO L225 Difference]: With dead ends: 106 [2020-08-19 00:27:44,226 INFO L226 Difference]: Without dead ends: 59 [2020-08-19 00:27:44,227 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=67, Invalid=485, Unknown=0, NotChecked=0, Total=552 [2020-08-19 00:27:44,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-08-19 00:27:44,231 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 56. [2020-08-19 00:27:44,231 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-08-19 00:27:44,232 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 58 transitions. [2020-08-19 00:27:44,232 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 58 transitions. Word has length 53 [2020-08-19 00:27:44,232 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:27:44,232 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 58 transitions. [2020-08-19 00:27:44,232 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-19 00:27:44,233 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 58 transitions. [2020-08-19 00:27:44,233 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-08-19 00:27:44,233 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:27:44,233 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 00:27:44,233 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-19 00:27:44,234 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:27:44,234 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:27:44,234 INFO L82 PathProgramCache]: Analyzing trace with hash -1032811663, now seen corresponding path program 20 times [2020-08-19 00:27:44,234 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:27:44,234 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [112807489] [2020-08-19 00:27:44,234 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:27:44,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:44,743 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:27:44,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:44,753 INFO L134 CoverageAnalysis]: Checked inductivity of 402 backedges. 2 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 00:27:44,753 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [112807489] [2020-08-19 00:27:44,753 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 00:27:44,753 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-19 00:27:44,754 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [509308394] [2020-08-19 00:27:44,754 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-19 00:27:44,754 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:27:44,754 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-19 00:27:44,755 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=487, Unknown=0, NotChecked=0, Total=552 [2020-08-19 00:27:44,755 INFO L87 Difference]: Start difference. First operand 56 states and 58 transitions. Second operand 24 states. [2020-08-19 00:27:45,610 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:27:45,611 INFO L93 Difference]: Finished difference Result 110 states and 115 transitions. [2020-08-19 00:27:45,611 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-19 00:27:45,611 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 55 [2020-08-19 00:27:45,612 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:27:45,612 INFO L225 Difference]: With dead ends: 110 [2020-08-19 00:27:45,612 INFO L226 Difference]: Without dead ends: 61 [2020-08-19 00:27:45,613 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=70, Invalid=530, Unknown=0, NotChecked=0, Total=600 [2020-08-19 00:27:45,613 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-08-19 00:27:45,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 58. [2020-08-19 00:27:45,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-08-19 00:27:45,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 60 transitions. [2020-08-19 00:27:45,618 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 60 transitions. Word has length 55 [2020-08-19 00:27:45,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:27:45,618 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 60 transitions. [2020-08-19 00:27:45,618 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-19 00:27:45,618 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 60 transitions. [2020-08-19 00:27:45,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-08-19 00:27:45,619 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:27:45,619 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 00:27:45,619 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-19 00:27:45,619 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:27:45,619 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:27:45,620 INFO L82 PathProgramCache]: Analyzing trace with hash 306942415, now seen corresponding path program 21 times [2020-08-19 00:27:45,620 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:27:45,620 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1008934962] [2020-08-19 00:27:45,620 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:27:45,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:46,139 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:27:46,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:46,148 INFO L134 CoverageAnalysis]: Checked inductivity of 443 backedges. 2 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 00:27:46,149 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1008934962] [2020-08-19 00:27:46,149 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 00:27:46,149 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-19 00:27:46,149 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1467125874] [2020-08-19 00:27:46,150 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-19 00:27:46,150 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:27:46,150 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-19 00:27:46,150 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=532, Unknown=0, NotChecked=0, Total=600 [2020-08-19 00:27:46,151 INFO L87 Difference]: Start difference. First operand 58 states and 60 transitions. Second operand 25 states. [2020-08-19 00:27:46,982 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:27:46,982 INFO L93 Difference]: Finished difference Result 114 states and 119 transitions. [2020-08-19 00:27:46,983 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-19 00:27:46,983 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 57 [2020-08-19 00:27:46,983 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:27:46,983 INFO L225 Difference]: With dead ends: 114 [2020-08-19 00:27:46,984 INFO L226 Difference]: Without dead ends: 63 [2020-08-19 00:27:46,984 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=73, Invalid=577, Unknown=0, NotChecked=0, Total=650 [2020-08-19 00:27:46,985 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-08-19 00:27:46,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 60. [2020-08-19 00:27:46,989 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-08-19 00:27:46,989 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 62 transitions. [2020-08-19 00:27:46,989 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 62 transitions. Word has length 57 [2020-08-19 00:27:46,989 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:27:46,989 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 62 transitions. [2020-08-19 00:27:46,989 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-19 00:27:46,990 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 62 transitions. [2020-08-19 00:27:46,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2020-08-19 00:27:46,990 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:27:46,990 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 00:27:46,990 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-19 00:27:46,990 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:27:46,990 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:27:46,991 INFO L82 PathProgramCache]: Analyzing trace with hash -679577427, now seen corresponding path program 22 times [2020-08-19 00:27:46,991 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:27:46,991 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [189392539] [2020-08-19 00:27:46,991 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:27:47,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:47,621 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:27:47,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:47,634 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 2 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 00:27:47,634 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [189392539] [2020-08-19 00:27:47,634 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 00:27:47,634 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-19 00:27:47,635 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [503226840] [2020-08-19 00:27:47,635 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-19 00:27:47,635 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:27:47,636 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-19 00:27:47,636 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=579, Unknown=0, NotChecked=0, Total=650 [2020-08-19 00:27:47,636 INFO L87 Difference]: Start difference. First operand 60 states and 62 transitions. Second operand 26 states. [2020-08-19 00:27:48,545 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:27:48,545 INFO L93 Difference]: Finished difference Result 118 states and 123 transitions. [2020-08-19 00:27:48,546 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-19 00:27:48,547 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 59 [2020-08-19 00:27:48,547 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:27:48,547 INFO L225 Difference]: With dead ends: 118 [2020-08-19 00:27:48,547 INFO L226 Difference]: Without dead ends: 65 [2020-08-19 00:27:48,548 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=76, Invalid=626, Unknown=0, NotChecked=0, Total=702 [2020-08-19 00:27:48,548 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2020-08-19 00:27:48,552 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 62. [2020-08-19 00:27:48,553 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2020-08-19 00:27:48,553 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 64 transitions. [2020-08-19 00:27:48,553 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 64 transitions. Word has length 59 [2020-08-19 00:27:48,554 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:27:48,554 INFO L479 AbstractCegarLoop]: Abstraction has 62 states and 64 transitions. [2020-08-19 00:27:48,554 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-19 00:27:48,554 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 64 transitions. [2020-08-19 00:27:48,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-08-19 00:27:48,554 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:27:48,555 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 00:27:48,555 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-19 00:27:48,555 INFO L427 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:27:48,555 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:27:48,555 INFO L82 PathProgramCache]: Analyzing trace with hash 462626827, now seen corresponding path program 23 times [2020-08-19 00:27:48,556 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:27:48,556 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1673548554] [2020-08-19 00:27:48,556 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:27:48,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:49,122 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:27:49,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:49,137 INFO L134 CoverageAnalysis]: Checked inductivity of 531 backedges. 2 proven. 529 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 00:27:49,137 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1673548554] [2020-08-19 00:27:49,137 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 00:27:49,138 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-19 00:27:49,138 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1643263892] [2020-08-19 00:27:49,138 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-19 00:27:49,138 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:27:49,139 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-19 00:27:49,139 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=628, Unknown=0, NotChecked=0, Total=702 [2020-08-19 00:27:49,139 INFO L87 Difference]: Start difference. First operand 62 states and 64 transitions. Second operand 27 states. [2020-08-19 00:27:50,330 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:27:50,330 INFO L93 Difference]: Finished difference Result 122 states and 127 transitions. [2020-08-19 00:27:50,334 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-19 00:27:50,334 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 61 [2020-08-19 00:27:50,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:27:50,335 INFO L225 Difference]: With dead ends: 122 [2020-08-19 00:27:50,335 INFO L226 Difference]: Without dead ends: 67 [2020-08-19 00:27:50,336 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=79, Invalid=677, Unknown=0, NotChecked=0, Total=756 [2020-08-19 00:27:50,336 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-08-19 00:27:50,340 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 64. [2020-08-19 00:27:50,340 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-08-19 00:27:50,340 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 66 transitions. [2020-08-19 00:27:50,341 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 66 transitions. Word has length 61 [2020-08-19 00:27:50,341 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:27:50,341 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 66 transitions. [2020-08-19 00:27:50,341 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-19 00:27:50,341 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 66 transitions. [2020-08-19 00:27:50,342 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2020-08-19 00:27:50,342 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:27:50,342 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 00:27:50,342 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-19 00:27:50,342 INFO L427 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:27:50,342 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:27:50,343 INFO L82 PathProgramCache]: Analyzing trace with hash -1390712855, now seen corresponding path program 24 times [2020-08-19 00:27:50,343 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:27:50,343 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [116189122] [2020-08-19 00:27:50,343 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:27:50,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:50,986 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:27:50,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:50,994 INFO L134 CoverageAnalysis]: Checked inductivity of 578 backedges. 2 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 00:27:50,994 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [116189122] [2020-08-19 00:27:50,994 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 00:27:50,994 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-19 00:27:50,995 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1539021210] [2020-08-19 00:27:50,995 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-19 00:27:50,995 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:27:50,995 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-19 00:27:50,996 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=679, Unknown=0, NotChecked=0, Total=756 [2020-08-19 00:27:50,996 INFO L87 Difference]: Start difference. First operand 64 states and 66 transitions. Second operand 28 states. [2020-08-19 00:27:52,160 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:27:52,161 INFO L93 Difference]: Finished difference Result 126 states and 131 transitions. [2020-08-19 00:27:52,164 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-19 00:27:52,164 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 63 [2020-08-19 00:27:52,164 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:27:52,165 INFO L225 Difference]: With dead ends: 126 [2020-08-19 00:27:52,165 INFO L226 Difference]: Without dead ends: 69 [2020-08-19 00:27:52,165 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=82, Invalid=730, Unknown=0, NotChecked=0, Total=812 [2020-08-19 00:27:52,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2020-08-19 00:27:52,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 66. [2020-08-19 00:27:52,169 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-08-19 00:27:52,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 68 transitions. [2020-08-19 00:27:52,170 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 68 transitions. Word has length 63 [2020-08-19 00:27:52,170 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:27:52,170 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 68 transitions. [2020-08-19 00:27:52,170 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-19 00:27:52,170 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 68 transitions. [2020-08-19 00:27:52,171 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-08-19 00:27:52,171 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:27:52,171 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 00:27:52,171 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-19 00:27:52,171 INFO L427 AbstractCegarLoop]: === Iteration 29 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:27:52,171 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:27:52,171 INFO L82 PathProgramCache]: Analyzing trace with hash -38719417, now seen corresponding path program 25 times [2020-08-19 00:27:52,171 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:27:52,172 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2019154291] [2020-08-19 00:27:52,172 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:27:52,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:52,928 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:27:52,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:52,938 INFO L134 CoverageAnalysis]: Checked inductivity of 627 backedges. 2 proven. 625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 00:27:52,938 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2019154291] [2020-08-19 00:27:52,938 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 00:27:52,938 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-19 00:27:52,939 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1748229067] [2020-08-19 00:27:52,939 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-19 00:27:52,939 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:27:52,940 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-19 00:27:52,940 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=732, Unknown=0, NotChecked=0, Total=812 [2020-08-19 00:27:52,940 INFO L87 Difference]: Start difference. First operand 66 states and 68 transitions. Second operand 29 states. [2020-08-19 00:27:54,152 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:27:54,153 INFO L93 Difference]: Finished difference Result 130 states and 135 transitions. [2020-08-19 00:27:54,155 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-19 00:27:54,156 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 65 [2020-08-19 00:27:54,156 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:27:54,156 INFO L225 Difference]: With dead ends: 130 [2020-08-19 00:27:54,156 INFO L226 Difference]: Without dead ends: 71 [2020-08-19 00:27:54,157 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=85, Invalid=785, Unknown=0, NotChecked=0, Total=870 [2020-08-19 00:27:54,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2020-08-19 00:27:54,162 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 68. [2020-08-19 00:27:54,163 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2020-08-19 00:27:54,163 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 70 transitions. [2020-08-19 00:27:54,164 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 70 transitions. Word has length 65 [2020-08-19 00:27:54,164 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:27:54,164 INFO L479 AbstractCegarLoop]: Abstraction has 68 states and 70 transitions. [2020-08-19 00:27:54,164 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-19 00:27:54,164 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 70 transitions. [2020-08-19 00:27:54,164 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-08-19 00:27:54,164 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:27:54,164 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 00:27:54,165 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-19 00:27:54,165 INFO L427 AbstractCegarLoop]: === Iteration 30 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:27:54,165 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:27:54,165 INFO L82 PathProgramCache]: Analyzing trace with hash 2146851109, now seen corresponding path program 26 times [2020-08-19 00:27:54,165 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:27:54,165 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [368129645] [2020-08-19 00:27:54,165 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:27:54,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:55,190 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:27:55,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:55,210 INFO L134 CoverageAnalysis]: Checked inductivity of 678 backedges. 2 proven. 676 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 00:27:55,210 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [368129645] [2020-08-19 00:27:55,210 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 00:27:55,210 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-19 00:27:55,211 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [603609306] [2020-08-19 00:27:55,211 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-19 00:27:55,212 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:27:55,212 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-19 00:27:55,213 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=787, Unknown=0, NotChecked=0, Total=870 [2020-08-19 00:27:55,213 INFO L87 Difference]: Start difference. First operand 68 states and 70 transitions. Second operand 30 states. [2020-08-19 00:27:56,769 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:27:56,769 INFO L93 Difference]: Finished difference Result 134 states and 139 transitions. [2020-08-19 00:27:56,769 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-19 00:27:56,769 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 67 [2020-08-19 00:27:56,770 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:27:56,770 INFO L225 Difference]: With dead ends: 134 [2020-08-19 00:27:56,770 INFO L226 Difference]: Without dead ends: 73 [2020-08-19 00:27:56,771 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=88, Invalid=842, Unknown=0, NotChecked=0, Total=930 [2020-08-19 00:27:56,771 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-08-19 00:27:56,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 70. [2020-08-19 00:27:56,775 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-08-19 00:27:56,775 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 72 transitions. [2020-08-19 00:27:56,775 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 72 transitions. Word has length 67 [2020-08-19 00:27:56,775 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:27:56,775 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 72 transitions. [2020-08-19 00:27:56,775 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-19 00:27:56,776 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 72 transitions. [2020-08-19 00:27:56,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-08-19 00:27:56,776 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:27:56,776 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 00:27:56,776 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-19 00:27:56,777 INFO L427 AbstractCegarLoop]: === Iteration 31 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:27:56,777 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:27:56,777 INFO L82 PathProgramCache]: Analyzing trace with hash -2053848445, now seen corresponding path program 27 times [2020-08-19 00:27:56,777 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:27:56,777 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [102033977] [2020-08-19 00:27:56,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:27:56,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:57,544 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:27:57,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:57,554 INFO L134 CoverageAnalysis]: Checked inductivity of 731 backedges. 2 proven. 729 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 00:27:57,555 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [102033977] [2020-08-19 00:27:57,555 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 00:27:57,555 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-19 00:27:57,555 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [819410042] [2020-08-19 00:27:57,555 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-19 00:27:57,555 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:27:57,556 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-19 00:27:57,556 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=844, Unknown=0, NotChecked=0, Total=930 [2020-08-19 00:27:57,556 INFO L87 Difference]: Start difference. First operand 70 states and 72 transitions. Second operand 31 states. [2020-08-19 00:27:58,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:27:58,938 INFO L93 Difference]: Finished difference Result 138 states and 143 transitions. [2020-08-19 00:27:58,944 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-19 00:27:58,944 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 69 [2020-08-19 00:27:58,945 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:27:58,945 INFO L225 Difference]: With dead ends: 138 [2020-08-19 00:27:58,945 INFO L226 Difference]: Without dead ends: 75 [2020-08-19 00:27:58,946 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=91, Invalid=901, Unknown=0, NotChecked=0, Total=992 [2020-08-19 00:27:58,946 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2020-08-19 00:27:58,950 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 72. [2020-08-19 00:27:58,951 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-08-19 00:27:58,951 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 74 transitions. [2020-08-19 00:27:58,951 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 74 transitions. Word has length 69 [2020-08-19 00:27:58,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:27:58,952 INFO L479 AbstractCegarLoop]: Abstraction has 72 states and 74 transitions. [2020-08-19 00:27:58,952 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-19 00:27:58,952 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 74 transitions. [2020-08-19 00:27:58,952 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2020-08-19 00:27:58,952 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:27:58,953 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 00:27:58,953 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-19 00:27:58,953 INFO L427 AbstractCegarLoop]: === Iteration 32 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:27:58,953 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:27:58,953 INFO L82 PathProgramCache]: Analyzing trace with hash -1656861599, now seen corresponding path program 28 times [2020-08-19 00:27:58,953 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:27:58,954 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1082975656] [2020-08-19 00:27:58,954 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:27:58,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:59,811 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:27:59,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:59,821 INFO L134 CoverageAnalysis]: Checked inductivity of 786 backedges. 2 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 00:27:59,821 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1082975656] [2020-08-19 00:27:59,821 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 00:27:59,821 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-19 00:27:59,822 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [243226417] [2020-08-19 00:27:59,822 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-19 00:27:59,822 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:27:59,822 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-19 00:27:59,823 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=903, Unknown=0, NotChecked=0, Total=992 [2020-08-19 00:27:59,823 INFO L87 Difference]: Start difference. First operand 72 states and 74 transitions. Second operand 32 states. [2020-08-19 00:28:01,391 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:28:01,391 INFO L93 Difference]: Finished difference Result 142 states and 147 transitions. [2020-08-19 00:28:01,392 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-19 00:28:01,392 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 71 [2020-08-19 00:28:01,393 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:28:01,393 INFO L225 Difference]: With dead ends: 142 [2020-08-19 00:28:01,393 INFO L226 Difference]: Without dead ends: 77 [2020-08-19 00:28:01,394 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=94, Invalid=962, Unknown=0, NotChecked=0, Total=1056 [2020-08-19 00:28:01,396 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2020-08-19 00:28:01,400 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 74. [2020-08-19 00:28:01,401 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2020-08-19 00:28:01,402 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 76 transitions. [2020-08-19 00:28:01,402 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 76 transitions. Word has length 71 [2020-08-19 00:28:01,403 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:28:01,403 INFO L479 AbstractCegarLoop]: Abstraction has 74 states and 76 transitions. [2020-08-19 00:28:01,404 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-19 00:28:01,404 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 76 transitions. [2020-08-19 00:28:01,407 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2020-08-19 00:28:01,407 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:28:01,407 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 00:28:01,407 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-19 00:28:01,408 INFO L427 AbstractCegarLoop]: === Iteration 33 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:28:01,408 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:28:01,408 INFO L82 PathProgramCache]: Analyzing trace with hash 1890375359, now seen corresponding path program 29 times [2020-08-19 00:28:01,408 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:28:01,408 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1498065941] [2020-08-19 00:28:01,408 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:28:01,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:28:02,328 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:28:02,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:28:02,339 INFO L134 CoverageAnalysis]: Checked inductivity of 843 backedges. 2 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 00:28:02,339 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1498065941] [2020-08-19 00:28:02,339 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 00:28:02,340 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-19 00:28:02,340 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1797327934] [2020-08-19 00:28:02,340 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-19 00:28:02,340 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:28:02,341 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-19 00:28:02,341 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=964, Unknown=0, NotChecked=0, Total=1056 [2020-08-19 00:28:02,341 INFO L87 Difference]: Start difference. First operand 74 states and 76 transitions. Second operand 33 states. [2020-08-19 00:28:03,989 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:28:03,990 INFO L93 Difference]: Finished difference Result 146 states and 151 transitions. [2020-08-19 00:28:03,990 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-19 00:28:03,990 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 73 [2020-08-19 00:28:03,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:28:03,991 INFO L225 Difference]: With dead ends: 146 [2020-08-19 00:28:03,991 INFO L226 Difference]: Without dead ends: 79 [2020-08-19 00:28:03,993 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=97, Invalid=1025, Unknown=0, NotChecked=0, Total=1122 [2020-08-19 00:28:03,993 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2020-08-19 00:28:03,998 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 76. [2020-08-19 00:28:03,999 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-08-19 00:28:03,999 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 78 transitions. [2020-08-19 00:28:03,999 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 78 transitions. Word has length 73 [2020-08-19 00:28:03,999 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:28:04,000 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 78 transitions. [2020-08-19 00:28:04,000 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-19 00:28:04,000 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 78 transitions. [2020-08-19 00:28:04,000 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2020-08-19 00:28:04,000 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:28:04,001 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 00:28:04,001 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-19 00:28:04,001 INFO L427 AbstractCegarLoop]: === Iteration 34 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:28:04,001 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:28:04,001 INFO L82 PathProgramCache]: Analyzing trace with hash 581058973, now seen corresponding path program 30 times [2020-08-19 00:28:04,001 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:28:04,001 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1226082743] [2020-08-19 00:28:04,001 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:28:04,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:28:04,896 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:28:04,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:28:04,910 INFO L134 CoverageAnalysis]: Checked inductivity of 902 backedges. 2 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 00:28:04,910 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1226082743] [2020-08-19 00:28:04,911 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 00:28:04,911 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-19 00:28:04,911 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [685691934] [2020-08-19 00:28:04,911 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-19 00:28:04,912 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:28:04,912 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-19 00:28:04,912 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=1027, Unknown=0, NotChecked=0, Total=1122 [2020-08-19 00:28:04,913 INFO L87 Difference]: Start difference. First operand 76 states and 78 transitions. Second operand 34 states. [2020-08-19 00:28:06,702 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:28:06,703 INFO L93 Difference]: Finished difference Result 150 states and 155 transitions. [2020-08-19 00:28:06,703 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-19 00:28:06,703 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 75 [2020-08-19 00:28:06,704 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:28:06,704 INFO L225 Difference]: With dead ends: 150 [2020-08-19 00:28:06,704 INFO L226 Difference]: Without dead ends: 81 [2020-08-19 00:28:06,705 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=100, Invalid=1090, Unknown=0, NotChecked=0, Total=1190 [2020-08-19 00:28:06,705 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2020-08-19 00:28:06,709 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 78. [2020-08-19 00:28:06,710 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2020-08-19 00:28:06,710 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 80 transitions. [2020-08-19 00:28:06,710 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 80 transitions. Word has length 75 [2020-08-19 00:28:06,710 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:28:06,710 INFO L479 AbstractCegarLoop]: Abstraction has 78 states and 80 transitions. [2020-08-19 00:28:06,711 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-19 00:28:06,711 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 80 transitions. [2020-08-19 00:28:06,711 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2020-08-19 00:28:06,711 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:28:06,712 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 00:28:06,712 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-19 00:28:06,712 INFO L427 AbstractCegarLoop]: === Iteration 35 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:28:06,712 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:28:06,712 INFO L82 PathProgramCache]: Analyzing trace with hash 753429755, now seen corresponding path program 31 times [2020-08-19 00:28:06,712 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:28:06,713 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1462804971] [2020-08-19 00:28:06,713 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:28:06,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:28:07,734 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:28:07,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:28:07,746 INFO L134 CoverageAnalysis]: Checked inductivity of 963 backedges. 2 proven. 961 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 00:28:07,746 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1462804971] [2020-08-19 00:28:07,746 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 00:28:07,747 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-19 00:28:07,747 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [785473649] [2020-08-19 00:28:07,747 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-19 00:28:07,747 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:28:07,747 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-19 00:28:07,748 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=1092, Unknown=0, NotChecked=0, Total=1190 [2020-08-19 00:28:07,748 INFO L87 Difference]: Start difference. First operand 78 states and 80 transitions. Second operand 35 states. [2020-08-19 00:28:09,578 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:28:09,578 INFO L93 Difference]: Finished difference Result 154 states and 159 transitions. [2020-08-19 00:28:09,580 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-19 00:28:09,580 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 77 [2020-08-19 00:28:09,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:28:09,581 INFO L225 Difference]: With dead ends: 154 [2020-08-19 00:28:09,581 INFO L226 Difference]: Without dead ends: 83 [2020-08-19 00:28:09,582 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=103, Invalid=1157, Unknown=0, NotChecked=0, Total=1260 [2020-08-19 00:28:09,582 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-08-19 00:28:09,586 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 80. [2020-08-19 00:28:09,586 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2020-08-19 00:28:09,587 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 82 transitions. [2020-08-19 00:28:09,587 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 82 transitions. Word has length 77 [2020-08-19 00:28:09,588 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:28:09,588 INFO L479 AbstractCegarLoop]: Abstraction has 80 states and 82 transitions. [2020-08-19 00:28:09,588 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-19 00:28:09,588 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 82 transitions. [2020-08-19 00:28:09,588 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2020-08-19 00:28:09,588 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:28:09,588 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 00:28:09,589 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-19 00:28:09,589 INFO L427 AbstractCegarLoop]: === Iteration 36 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:28:09,589 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:28:09,589 INFO L82 PathProgramCache]: Analyzing trace with hash -1101973287, now seen corresponding path program 32 times [2020-08-19 00:28:09,589 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:28:09,589 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1987670304] [2020-08-19 00:28:09,589 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:28:09,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:28:11,048 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:28:11,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:28:11,074 INFO L134 CoverageAnalysis]: Checked inductivity of 1026 backedges. 2 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 00:28:11,074 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1987670304] [2020-08-19 00:28:11,075 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 00:28:11,075 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-19 00:28:11,075 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1044108122] [2020-08-19 00:28:11,076 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-19 00:28:11,076 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:28:11,076 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-19 00:28:11,077 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=1159, Unknown=0, NotChecked=0, Total=1260 [2020-08-19 00:28:11,077 INFO L87 Difference]: Start difference. First operand 80 states and 82 transitions. Second operand 36 states. [2020-08-19 00:28:13,162 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:28:13,162 INFO L93 Difference]: Finished difference Result 158 states and 163 transitions. [2020-08-19 00:28:13,163 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-19 00:28:13,163 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 79 [2020-08-19 00:28:13,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:28:13,164 INFO L225 Difference]: With dead ends: 158 [2020-08-19 00:28:13,165 INFO L226 Difference]: Without dead ends: 85 [2020-08-19 00:28:13,166 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=106, Invalid=1226, Unknown=0, NotChecked=0, Total=1332 [2020-08-19 00:28:13,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2020-08-19 00:28:13,170 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 82. [2020-08-19 00:28:13,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2020-08-19 00:28:13,171 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 84 transitions. [2020-08-19 00:28:13,171 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 84 transitions. Word has length 79 [2020-08-19 00:28:13,172 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:28:13,172 INFO L479 AbstractCegarLoop]: Abstraction has 82 states and 84 transitions. [2020-08-19 00:28:13,172 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-19 00:28:13,172 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 84 transitions. [2020-08-19 00:28:13,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2020-08-19 00:28:13,173 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:28:13,173 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 00:28:13,173 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-19 00:28:13,173 INFO L427 AbstractCegarLoop]: === Iteration 37 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:28:13,173 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:28:13,173 INFO L82 PathProgramCache]: Analyzing trace with hash -1732868809, now seen corresponding path program 33 times [2020-08-19 00:28:13,174 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:28:13,174 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [293720128] [2020-08-19 00:28:13,174 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:28:13,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:28:14,372 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:28:14,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:28:14,387 INFO L134 CoverageAnalysis]: Checked inductivity of 1091 backedges. 2 proven. 1089 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 00:28:14,387 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [293720128] [2020-08-19 00:28:14,388 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 00:28:14,388 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-19 00:28:14,388 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1808381256] [2020-08-19 00:28:14,388 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-19 00:28:14,388 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:28:14,389 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-19 00:28:14,389 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=1228, Unknown=0, NotChecked=0, Total=1332 [2020-08-19 00:28:14,389 INFO L87 Difference]: Start difference. First operand 82 states and 84 transitions. Second operand 37 states. [2020-08-19 00:28:16,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:28:16,336 INFO L93 Difference]: Finished difference Result 162 states and 167 transitions. [2020-08-19 00:28:16,337 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-19 00:28:16,337 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 81 [2020-08-19 00:28:16,337 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:28:16,338 INFO L225 Difference]: With dead ends: 162 [2020-08-19 00:28:16,338 INFO L226 Difference]: Without dead ends: 87 [2020-08-19 00:28:16,339 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=109, Invalid=1297, Unknown=0, NotChecked=0, Total=1406 [2020-08-19 00:28:16,340 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2020-08-19 00:28:16,344 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 84. [2020-08-19 00:28:16,345 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2020-08-19 00:28:16,345 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 86 transitions. [2020-08-19 00:28:16,345 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 86 transitions. Word has length 81 [2020-08-19 00:28:16,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:28:16,346 INFO L479 AbstractCegarLoop]: Abstraction has 84 states and 86 transitions. [2020-08-19 00:28:16,346 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-19 00:28:16,346 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 86 transitions. [2020-08-19 00:28:16,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2020-08-19 00:28:16,347 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:28:16,347 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 00:28:16,347 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-19 00:28:16,347 INFO L427 AbstractCegarLoop]: === Iteration 38 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:28:16,347 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:28:16,347 INFO L82 PathProgramCache]: Analyzing trace with hash 1861890581, now seen corresponding path program 34 times [2020-08-19 00:28:16,348 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:28:16,348 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1271170574] [2020-08-19 00:28:16,348 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:28:16,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:28:17,590 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:28:17,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:28:17,602 INFO L134 CoverageAnalysis]: Checked inductivity of 1158 backedges. 2 proven. 1156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 00:28:17,602 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1271170574] [2020-08-19 00:28:17,603 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 00:28:17,603 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-19 00:28:17,603 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2054524914] [2020-08-19 00:28:17,603 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-19 00:28:17,603 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:28:17,604 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-19 00:28:17,604 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=1299, Unknown=0, NotChecked=0, Total=1406 [2020-08-19 00:28:17,604 INFO L87 Difference]: Start difference. First operand 84 states and 86 transitions. Second operand 38 states. [2020-08-19 00:28:19,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:28:19,787 INFO L93 Difference]: Finished difference Result 166 states and 171 transitions. [2020-08-19 00:28:19,789 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-19 00:28:19,789 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 83 [2020-08-19 00:28:19,789 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:28:19,790 INFO L225 Difference]: With dead ends: 166 [2020-08-19 00:28:19,790 INFO L226 Difference]: Without dead ends: 89 [2020-08-19 00:28:19,791 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=112, Invalid=1370, Unknown=0, NotChecked=0, Total=1482 [2020-08-19 00:28:19,791 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2020-08-19 00:28:19,795 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 86. [2020-08-19 00:28:19,796 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2020-08-19 00:28:19,796 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 88 transitions. [2020-08-19 00:28:19,797 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 88 transitions. Word has length 83 [2020-08-19 00:28:19,797 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:28:19,797 INFO L479 AbstractCegarLoop]: Abstraction has 86 states and 88 transitions. [2020-08-19 00:28:19,797 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-19 00:28:19,797 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 88 transitions. [2020-08-19 00:28:19,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2020-08-19 00:28:19,798 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:28:19,798 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 00:28:19,798 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-19 00:28:19,798 INFO L427 AbstractCegarLoop]: === Iteration 39 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:28:19,799 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:28:19,799 INFO L82 PathProgramCache]: Analyzing trace with hash -1023008909, now seen corresponding path program 35 times [2020-08-19 00:28:19,799 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:28:19,799 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [219535233] [2020-08-19 00:28:19,799 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:28:19,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:28:21,111 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:28:21,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:28:21,124 INFO L134 CoverageAnalysis]: Checked inductivity of 1227 backedges. 2 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 00:28:21,124 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [219535233] [2020-08-19 00:28:21,124 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 00:28:21,124 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-19 00:28:21,124 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1170091447] [2020-08-19 00:28:21,125 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-19 00:28:21,125 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:28:21,125 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-19 00:28:21,125 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=1372, Unknown=0, NotChecked=0, Total=1482 [2020-08-19 00:28:21,126 INFO L87 Difference]: Start difference. First operand 86 states and 88 transitions. Second operand 39 states. [2020-08-19 00:28:23,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:28:23,374 INFO L93 Difference]: Finished difference Result 170 states and 175 transitions. [2020-08-19 00:28:23,375 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-19 00:28:23,375 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 85 [2020-08-19 00:28:23,376 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:28:23,376 INFO L225 Difference]: With dead ends: 170 [2020-08-19 00:28:23,376 INFO L226 Difference]: Without dead ends: 91 [2020-08-19 00:28:23,377 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=115, Invalid=1445, Unknown=0, NotChecked=0, Total=1560 [2020-08-19 00:28:23,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2020-08-19 00:28:23,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 88. [2020-08-19 00:28:23,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2020-08-19 00:28:23,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 90 transitions. [2020-08-19 00:28:23,389 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 90 transitions. Word has length 85 [2020-08-19 00:28:23,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:28:23,390 INFO L479 AbstractCegarLoop]: Abstraction has 88 states and 90 transitions. [2020-08-19 00:28:23,390 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-19 00:28:23,390 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 90 transitions. [2020-08-19 00:28:23,391 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2020-08-19 00:28:23,391 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:28:23,391 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 00:28:23,391 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-19 00:28:23,392 INFO L427 AbstractCegarLoop]: === Iteration 40 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:28:23,392 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:28:23,392 INFO L82 PathProgramCache]: Analyzing trace with hash 1137454417, now seen corresponding path program 36 times [2020-08-19 00:28:23,392 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:28:23,392 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [123462972] [2020-08-19 00:28:23,392 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:28:23,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:28:24,859 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:28:24,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:28:24,875 INFO L134 CoverageAnalysis]: Checked inductivity of 1298 backedges. 2 proven. 1296 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 00:28:24,875 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [123462972] [2020-08-19 00:28:24,875 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 00:28:24,875 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-19 00:28:24,875 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1477446701] [2020-08-19 00:28:24,876 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-19 00:28:24,876 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:28:24,876 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-19 00:28:24,876 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=1447, Unknown=0, NotChecked=0, Total=1560 [2020-08-19 00:28:24,877 INFO L87 Difference]: Start difference. First operand 88 states and 90 transitions. Second operand 40 states. [2020-08-19 00:28:27,272 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:28:27,272 INFO L93 Difference]: Finished difference Result 174 states and 179 transitions. [2020-08-19 00:28:27,273 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-19 00:28:27,273 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 87 [2020-08-19 00:28:27,274 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:28:27,274 INFO L225 Difference]: With dead ends: 174 [2020-08-19 00:28:27,274 INFO L226 Difference]: Without dead ends: 93 [2020-08-19 00:28:27,275 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=118, Invalid=1522, Unknown=0, NotChecked=0, Total=1640 [2020-08-19 00:28:27,276 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-08-19 00:28:27,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 90. [2020-08-19 00:28:27,281 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2020-08-19 00:28:27,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 92 transitions. [2020-08-19 00:28:27,282 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 92 transitions. Word has length 87 [2020-08-19 00:28:27,282 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:28:27,283 INFO L479 AbstractCegarLoop]: Abstraction has 90 states and 92 transitions. [2020-08-19 00:28:27,283 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-19 00:28:27,283 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 92 transitions. [2020-08-19 00:28:27,284 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2020-08-19 00:28:27,284 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:28:27,284 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 00:28:27,284 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-19 00:28:27,284 INFO L427 AbstractCegarLoop]: === Iteration 41 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:28:27,284 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:28:27,285 INFO L82 PathProgramCache]: Analyzing trace with hash -1421460561, now seen corresponding path program 37 times [2020-08-19 00:28:27,285 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:28:27,285 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [994709933] [2020-08-19 00:28:27,285 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:28:27,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:28:28,743 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:28:28,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:28:28,760 INFO L134 CoverageAnalysis]: Checked inductivity of 1371 backedges. 2 proven. 1369 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 00:28:28,760 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [994709933] [2020-08-19 00:28:28,760 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 00:28:28,760 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-19 00:28:28,760 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1786772684] [2020-08-19 00:28:28,761 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-19 00:28:28,761 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:28:28,761 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-19 00:28:28,762 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=1524, Unknown=0, NotChecked=0, Total=1640 [2020-08-19 00:28:28,762 INFO L87 Difference]: Start difference. First operand 90 states and 92 transitions. Second operand 41 states.