/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=SMALLESTAMONGWIDE --traceabstraction.additional.smt.options tolerance=0.2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-lit/cggmp2005b.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-19 04:31:14,762 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-19 04:31:14,765 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-19 04:31:14,789 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-19 04:31:14,789 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-19 04:31:14,790 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-19 04:31:14,792 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-19 04:31:14,794 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-19 04:31:14,795 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-19 04:31:14,796 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-19 04:31:14,797 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-19 04:31:14,798 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-19 04:31:14,799 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-19 04:31:14,799 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-19 04:31:14,800 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-19 04:31:14,802 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-19 04:31:14,802 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-19 04:31:14,803 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-19 04:31:14,805 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-19 04:31:14,807 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-19 04:31:14,809 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-19 04:31:14,810 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-19 04:31:14,811 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-19 04:31:14,812 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-19 04:31:14,814 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-19 04:31:14,822 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-19 04:31:14,823 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-19 04:31:14,823 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-19 04:31:14,824 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 04:31:14,848 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-19 04:31:14,848 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-19 04:31:14,849 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-19 04:31:14,850 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-19 04:31:14,850 INFO L138 SettingsManager]: * Use SBE=true [2020-08-19 04:31:14,850 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-19 04:31:14,850 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-19 04:31:14,850 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-19 04:31:14,851 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-19 04:31:14,851 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-19 04:31:14,851 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-19 04:31:14,851 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-19 04:31:14,851 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-19 04:31:14,852 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-19 04:31:14,852 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-19 04:31:14,852 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-19 04:31:14,852 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-19 04:31:14,852 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-19 04:31:14,853 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-19 04:31:14,853 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-19 04:31:14,853 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-19 04:31:14,853 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-19 04:31:14,853 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-19 04:31:14,854 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-19 04:31:14,854 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-19 04:31:14,854 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-19 04:31:14,854 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-19 04:31:14,854 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-19 04:31:14,855 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-19 04:31:14,855 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=SMALLESTAMONGWIDE;tolerance=0.2; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.2; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.2; [2020-08-19 04:31:15,166 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-19 04:31:15,179 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-19 04:31:15,183 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-19 04:31:15,184 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-19 04:31:15,184 INFO L275 PluginConnector]: CDTParser initialized [2020-08-19 04:31:15,185 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/cggmp2005b.i [2020-08-19 04:31:15,247 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/f459d0835/3bfe254c23a849f18235b43576d897b2/FLAG81c2630aa [2020-08-19 04:31:15,687 INFO L306 CDTParser]: Found 1 translation units. [2020-08-19 04:31:15,688 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-lit/cggmp2005b.i [2020-08-19 04:31:15,694 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/f459d0835/3bfe254c23a849f18235b43576d897b2/FLAG81c2630aa [2020-08-19 04:31:16,098 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/f459d0835/3bfe254c23a849f18235b43576d897b2 [2020-08-19 04:31:16,110 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-19 04:31:16,112 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-19 04:31:16,117 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-19 04:31:16,117 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-19 04:31:16,121 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-19 04:31:16,122 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 04:31:16" (1/1) ... [2020-08-19 04:31:16,125 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@30741c12 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 04:31:16, skipping insertion in model container [2020-08-19 04:31:16,125 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 04:31:16" (1/1) ... [2020-08-19 04:31:16,134 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-19 04:31:16,153 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-19 04:31:16,360 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 04:31:16,365 INFO L203 MainTranslator]: Completed pre-run [2020-08-19 04:31:16,379 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 04:31:16,393 INFO L208 MainTranslator]: Completed translation [2020-08-19 04:31:16,393 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 04:31:16 WrapperNode [2020-08-19 04:31:16,394 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-19 04:31:16,394 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-19 04:31:16,394 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-19 04:31:16,395 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-19 04:31:16,404 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 04:31:16" (1/1) ... [2020-08-19 04:31:16,405 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 04:31:16" (1/1) ... [2020-08-19 04:31:16,483 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 04:31:16" (1/1) ... [2020-08-19 04:31:16,483 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 04:31:16" (1/1) ... [2020-08-19 04:31:16,488 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 04:31:16" (1/1) ... [2020-08-19 04:31:16,494 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 04:31:16" (1/1) ... [2020-08-19 04:31:16,495 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 04:31:16" (1/1) ... [2020-08-19 04:31:16,496 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-19 04:31:16,497 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-19 04:31:16,497 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-19 04:31:16,497 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-19 04:31:16,498 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 04:31:16" (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 04:31:16,552 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-19 04:31:16,553 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-19 04:31:16,553 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-19 04:31:16,554 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-19 04:31:16,554 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-19 04:31:16,554 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-19 04:31:16,554 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-19 04:31:16,555 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-19 04:31:16,555 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-19 04:31:16,556 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-19 04:31:16,556 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-19 04:31:16,556 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-19 04:31:16,556 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-19 04:31:16,746 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-19 04:31:16,747 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-19 04:31:16,751 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 04:31:16 BoogieIcfgContainer [2020-08-19 04:31:16,751 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-19 04:31:16,753 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-19 04:31:16,753 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-19 04:31:16,756 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-19 04:31:16,756 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.08 04:31:16" (1/3) ... [2020-08-19 04:31:16,757 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7b691c6e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 04:31:16, skipping insertion in model container [2020-08-19 04:31:16,757 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 04:31:16" (2/3) ... [2020-08-19 04:31:16,758 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7b691c6e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 04:31:16, skipping insertion in model container [2020-08-19 04:31:16,758 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 04:31:16" (3/3) ... [2020-08-19 04:31:16,760 INFO L109 eAbstractionObserver]: Analyzing ICFG cggmp2005b.i [2020-08-19 04:31:16,771 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-19 04:31:16,779 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-19 04:31:16,794 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-19 04:31:16,817 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-19 04:31:16,817 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-19 04:31:16,817 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-19 04:31:16,817 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-19 04:31:16,817 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-19 04:31:16,818 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-19 04:31:16,818 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-19 04:31:16,818 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-19 04:31:16,833 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2020-08-19 04:31:16,838 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-19 04:31:16,838 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:31:16,839 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:31:16,839 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:31:16,844 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:31:16,844 INFO L82 PathProgramCache]: Analyzing trace with hash -1039733575, now seen corresponding path program 1 times [2020-08-19 04:31:16,851 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:31:16,852 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1649805737] [2020-08-19 04:31:16,852 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:31:16,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:16,957 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:31:16,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:16,963 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 04:31:16,964 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1649805737] [2020-08-19 04:31:16,965 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 04:31:16,966 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-08-19 04:31:16,967 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [990160190] [2020-08-19 04:31:16,972 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-08-19 04:31:16,973 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:31:16,987 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-08-19 04:31:16,988 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-19 04:31:16,990 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 2 states. [2020-08-19 04:31:17,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:31:17,017 INFO L93 Difference]: Finished difference Result 37 states and 50 transitions. [2020-08-19 04:31:17,017 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-08-19 04:31:17,018 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2020-08-19 04:31:17,019 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:31:17,027 INFO L225 Difference]: With dead ends: 37 [2020-08-19 04:31:17,028 INFO L226 Difference]: Without dead ends: 14 [2020-08-19 04:31:17,031 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-19 04:31:17,051 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-08-19 04:31:17,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-08-19 04:31:17,070 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-08-19 04:31:17,071 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2020-08-19 04:31:17,073 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 10 [2020-08-19 04:31:17,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:31:17,073 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2020-08-19 04:31:17,074 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-08-19 04:31:17,074 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2020-08-19 04:31:17,074 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-19 04:31:17,075 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:31:17,075 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:31:17,075 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-19 04:31:17,076 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:31:17,076 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:31:17,076 INFO L82 PathProgramCache]: Analyzing trace with hash -1066515684, now seen corresponding path program 1 times [2020-08-19 04:31:17,076 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:31:17,077 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1798769497] [2020-08-19 04:31:17,077 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:31:17,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:17,126 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:31:17,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:17,130 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 04:31:17,131 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1798769497] [2020-08-19 04:31:17,131 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 04:31:17,131 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-19 04:31:17,132 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [876860698] [2020-08-19 04:31:17,133 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-19 04:31:17,134 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:31:17,134 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-19 04:31:17,135 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-19 04:31:17,135 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand 3 states. [2020-08-19 04:31:17,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:31:17,155 INFO L93 Difference]: Finished difference Result 20 states and 22 transitions. [2020-08-19 04:31:17,156 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-19 04:31:17,156 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-08-19 04:31:17,157 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:31:17,158 INFO L225 Difference]: With dead ends: 20 [2020-08-19 04:31:17,158 INFO L226 Difference]: Without dead ends: 15 [2020-08-19 04:31:17,159 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-19 04:31:17,160 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-19 04:31:17,164 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-19 04:31:17,164 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-19 04:31:17,165 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-08-19 04:31:17,165 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 10 [2020-08-19 04:31:17,166 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:31:17,166 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-08-19 04:31:17,166 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-19 04:31:17,166 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-08-19 04:31:17,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-19 04:31:17,167 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:31:17,167 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:31:17,168 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-19 04:31:17,168 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:31:17,168 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:31:17,169 INFO L82 PathProgramCache]: Analyzing trace with hash 1875131310, now seen corresponding path program 1 times [2020-08-19 04:31:17,169 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:31:17,169 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1692261366] [2020-08-19 04:31:17,170 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:31:17,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:17,200 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:31:17,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:17,207 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 04:31:17,207 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1692261366] [2020-08-19 04:31:17,208 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 04:31:17,208 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-19 04:31:17,208 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1699974833] [2020-08-19 04:31:17,209 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-19 04:31:17,210 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:31:17,211 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-19 04:31:17,211 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-19 04:31:17,211 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 3 states. [2020-08-19 04:31:17,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:31:17,226 INFO L93 Difference]: Finished difference Result 25 states and 30 transitions. [2020-08-19 04:31:17,226 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-19 04:31:17,227 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 14 [2020-08-19 04:31:17,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:31:17,227 INFO L225 Difference]: With dead ends: 25 [2020-08-19 04:31:17,228 INFO L226 Difference]: Without dead ends: 16 [2020-08-19 04:31:17,229 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-19 04:31:17,230 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-19 04:31:17,235 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-19 04:31:17,235 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-19 04:31:17,236 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-08-19 04:31:17,237 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 14 [2020-08-19 04:31:17,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:31:17,237 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-08-19 04:31:17,237 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-19 04:31:17,237 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-08-19 04:31:17,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-19 04:31:17,239 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:31:17,240 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:31:17,240 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-19 04:31:17,240 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:31:17,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:31:17,241 INFO L82 PathProgramCache]: Analyzing trace with hash -224898986, now seen corresponding path program 1 times [2020-08-19 04:31:17,242 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:31:17,242 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1504701463] [2020-08-19 04:31:17,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:31:17,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:17,309 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:31:17,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:17,314 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:31:17,315 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1504701463] [2020-08-19 04:31:17,315 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:31:17,316 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-19 04:31:17,316 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [808357057] [2020-08-19 04:31:17,317 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-19 04:31:17,317 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:31:17,317 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-19 04:31:17,318 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-19 04:31:17,318 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 5 states. [2020-08-19 04:31:17,381 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:31:17,381 INFO L93 Difference]: Finished difference Result 26 states and 31 transitions. [2020-08-19 04:31:17,382 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-19 04:31:17,382 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 15 [2020-08-19 04:31:17,383 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:31:17,383 INFO L225 Difference]: With dead ends: 26 [2020-08-19 04:31:17,383 INFO L226 Difference]: Without dead ends: 17 [2020-08-19 04:31:17,384 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2020-08-19 04:31:17,385 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-19 04:31:17,390 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-19 04:31:17,390 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-19 04:31:17,391 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2020-08-19 04:31:17,391 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 15 [2020-08-19 04:31:17,391 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:31:17,392 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2020-08-19 04:31:17,392 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-19 04:31:17,392 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2020-08-19 04:31:17,393 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-19 04:31:17,393 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:31:17,393 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:31:17,393 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-19 04:31:17,394 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:31:17,394 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:31:17,394 INFO L82 PathProgramCache]: Analyzing trace with hash -901328722, now seen corresponding path program 2 times [2020-08-19 04:31:17,395 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:31:17,395 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [905051003] [2020-08-19 04:31:17,395 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:31:17,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:17,506 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:31:17,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:17,512 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:31:17,513 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [905051003] [2020-08-19 04:31:17,513 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:31:17,513 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-19 04:31:17,514 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1082831080] [2020-08-19 04:31:17,514 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-19 04:31:17,514 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:31:17,515 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-19 04:31:17,515 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-19 04:31:17,515 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand 6 states. [2020-08-19 04:31:17,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:31:17,607 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-08-19 04:31:17,607 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-19 04:31:17,608 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 16 [2020-08-19 04:31:17,608 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:31:17,609 INFO L225 Difference]: With dead ends: 27 [2020-08-19 04:31:17,609 INFO L226 Difference]: Without dead ends: 18 [2020-08-19 04:31:17,609 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2020-08-19 04:31:17,610 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-19 04:31:17,614 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-08-19 04:31:17,615 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-19 04:31:17,615 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2020-08-19 04:31:17,616 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 16 [2020-08-19 04:31:17,616 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:31:17,616 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2020-08-19 04:31:17,616 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-19 04:31:17,616 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2020-08-19 04:31:17,617 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-19 04:31:17,617 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:31:17,617 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:31:17,618 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-19 04:31:17,618 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:31:17,618 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:31:17,618 INFO L82 PathProgramCache]: Analyzing trace with hash -395814058, now seen corresponding path program 3 times [2020-08-19 04:31:17,619 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:31:17,619 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [120963433] [2020-08-19 04:31:17,619 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:31:17,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:17,707 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:31:17,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:17,711 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:31:17,712 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [120963433] [2020-08-19 04:31:17,712 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:31:17,712 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-19 04:31:17,713 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [918345567] [2020-08-19 04:31:17,713 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-19 04:31:17,714 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:31:17,714 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-19 04:31:17,714 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-08-19 04:31:17,715 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 7 states. [2020-08-19 04:31:17,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:31:17,886 INFO L93 Difference]: Finished difference Result 28 states and 33 transitions. [2020-08-19 04:31:17,886 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-19 04:31:17,886 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 17 [2020-08-19 04:31:17,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:31:17,888 INFO L225 Difference]: With dead ends: 28 [2020-08-19 04:31:17,888 INFO L226 Difference]: Without dead ends: 19 [2020-08-19 04:31:17,889 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2020-08-19 04:31:17,889 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-08-19 04:31:17,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-08-19 04:31:17,901 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-19 04:31:17,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2020-08-19 04:31:17,907 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 17 [2020-08-19 04:31:17,907 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:31:17,907 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2020-08-19 04:31:17,908 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-19 04:31:17,908 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2020-08-19 04:31:17,908 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-19 04:31:17,908 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:31:17,909 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:31:17,909 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-19 04:31:17,909 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:31:17,910 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:31:17,914 INFO L82 PathProgramCache]: Analyzing trace with hash -1904728658, now seen corresponding path program 4 times [2020-08-19 04:31:17,914 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:31:17,917 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1634000826] [2020-08-19 04:31:17,917 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:31:17,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:18,021 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:31:18,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:18,026 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:31:18,026 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1634000826] [2020-08-19 04:31:18,027 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:31:18,027 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-19 04:31:18,027 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [878507233] [2020-08-19 04:31:18,028 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-19 04:31:18,028 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:31:18,028 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-19 04:31:18,029 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-08-19 04:31:18,029 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand 8 states. [2020-08-19 04:31:18,158 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:31:18,159 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-08-19 04:31:18,159 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-19 04:31:18,159 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 18 [2020-08-19 04:31:18,160 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:31:18,160 INFO L225 Difference]: With dead ends: 29 [2020-08-19 04:31:18,160 INFO L226 Difference]: Without dead ends: 20 [2020-08-19 04:31:18,161 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=54, Invalid=102, Unknown=0, NotChecked=0, Total=156 [2020-08-19 04:31:18,162 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-19 04:31:18,166 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-19 04:31:18,167 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-19 04:31:18,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2020-08-19 04:31:18,168 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 18 [2020-08-19 04:31:18,168 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:31:18,168 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2020-08-19 04:31:18,168 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-19 04:31:18,169 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2020-08-19 04:31:18,169 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-19 04:31:18,169 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:31:18,169 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:31:18,170 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-19 04:31:18,170 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:31:18,170 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:31:18,170 INFO L82 PathProgramCache]: Analyzing trace with hash -1436441002, now seen corresponding path program 5 times [2020-08-19 04:31:18,171 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:31:18,171 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [462298898] [2020-08-19 04:31:18,171 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:31:18,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:18,260 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:31:18,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:18,263 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 1 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:31:18,267 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [462298898] [2020-08-19 04:31:18,268 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:31:18,268 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-19 04:31:18,268 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1510301946] [2020-08-19 04:31:18,268 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-19 04:31:18,269 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:31:18,269 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-19 04:31:18,269 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2020-08-19 04:31:18,270 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 9 states. [2020-08-19 04:31:18,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:31:18,452 INFO L93 Difference]: Finished difference Result 30 states and 35 transitions. [2020-08-19 04:31:18,453 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-19 04:31:18,453 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2020-08-19 04:31:18,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:31:18,454 INFO L225 Difference]: With dead ends: 30 [2020-08-19 04:31:18,454 INFO L226 Difference]: Without dead ends: 21 [2020-08-19 04:31:18,455 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=70, Invalid=140, Unknown=0, NotChecked=0, Total=210 [2020-08-19 04:31:18,455 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-19 04:31:18,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-19 04:31:18,460 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-19 04:31:18,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2020-08-19 04:31:18,461 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 19 [2020-08-19 04:31:18,461 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:31:18,461 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2020-08-19 04:31:18,461 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-19 04:31:18,462 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2020-08-19 04:31:18,462 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-19 04:31:18,462 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:31:18,462 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:31:18,463 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-19 04:31:18,463 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:31:18,463 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:31:18,463 INFO L82 PathProgramCache]: Analyzing trace with hash 195574446, now seen corresponding path program 6 times [2020-08-19 04:31:18,464 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:31:18,464 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [200590445] [2020-08-19 04:31:18,464 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:31:18,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:18,495 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:31:18,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:18,498 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 04:31:18,498 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [200590445] [2020-08-19 04:31:18,499 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:31:18,499 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-08-19 04:31:18,499 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1917913696] [2020-08-19 04:31:18,500 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-19 04:31:18,500 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:31:18,500 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-19 04:31:18,500 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-19 04:31:18,501 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand 4 states. [2020-08-19 04:31:18,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:31:18,517 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2020-08-19 04:31:18,517 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-19 04:31:18,517 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2020-08-19 04:31:18,518 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:31:18,518 INFO L225 Difference]: With dead ends: 30 [2020-08-19 04:31:18,518 INFO L226 Difference]: Without dead ends: 25 [2020-08-19 04:31:18,519 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-19 04:31:18,519 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-19 04:31:18,524 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-08-19 04:31:18,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-19 04:31:18,525 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 29 transitions. [2020-08-19 04:31:18,525 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 29 transitions. Word has length 20 [2020-08-19 04:31:18,526 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:31:18,526 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 29 transitions. [2020-08-19 04:31:18,526 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-19 04:31:18,526 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 29 transitions. [2020-08-19 04:31:18,527 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-19 04:31:18,527 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:31:18,527 INFO L422 BasicCegarLoop]: trace histogram [6, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:31:18,527 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-19 04:31:18,528 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:31:18,528 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:31:18,528 INFO L82 PathProgramCache]: Analyzing trace with hash 389290560, now seen corresponding path program 7 times [2020-08-19 04:31:18,528 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:31:18,529 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1476562840] [2020-08-19 04:31:18,529 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:31:18,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:18,571 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:31:18,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:18,574 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 04:31:18,575 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1476562840] [2020-08-19 04:31:18,575 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:31:18,575 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-19 04:31:18,576 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1057629447] [2020-08-19 04:31:18,576 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-19 04:31:18,577 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:31:18,577 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-19 04:31:18,577 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-08-19 04:31:18,577 INFO L87 Difference]: Start difference. First operand 25 states and 29 transitions. Second operand 5 states. [2020-08-19 04:31:18,608 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:31:18,609 INFO L93 Difference]: Finished difference Result 34 states and 40 transitions. [2020-08-19 04:31:18,610 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-19 04:31:18,610 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 24 [2020-08-19 04:31:18,611 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:31:18,611 INFO L225 Difference]: With dead ends: 34 [2020-08-19 04:31:18,611 INFO L226 Difference]: Without dead ends: 29 [2020-08-19 04:31:18,612 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-08-19 04:31:18,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-19 04:31:18,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-08-19 04:31:18,618 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-19 04:31:18,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 35 transitions. [2020-08-19 04:31:18,619 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 35 transitions. Word has length 24 [2020-08-19 04:31:18,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:31:18,619 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 35 transitions. [2020-08-19 04:31:18,619 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-19 04:31:18,619 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 35 transitions. [2020-08-19 04:31:18,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-19 04:31:18,620 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:31:18,620 INFO L422 BasicCegarLoop]: trace histogram [6, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:31:18,621 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-19 04:31:18,621 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:31:18,621 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:31:18,621 INFO L82 PathProgramCache]: Analyzing trace with hash -1279139630, now seen corresponding path program 8 times [2020-08-19 04:31:18,621 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:31:18,622 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1469359743] [2020-08-19 04:31:18,622 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:31:18,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:18,672 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:31:18,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:18,676 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 04:31:18,676 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1469359743] [2020-08-19 04:31:18,676 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:31:18,677 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-19 04:31:18,677 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1399572947] [2020-08-19 04:31:18,677 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-19 04:31:18,678 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:31:18,678 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-19 04:31:18,678 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-08-19 04:31:18,678 INFO L87 Difference]: Start difference. First operand 29 states and 35 transitions. Second operand 6 states. [2020-08-19 04:31:18,703 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:31:18,704 INFO L93 Difference]: Finished difference Result 38 states and 46 transitions. [2020-08-19 04:31:18,704 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-19 04:31:18,704 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 28 [2020-08-19 04:31:18,705 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:31:18,705 INFO L225 Difference]: With dead ends: 38 [2020-08-19 04:31:18,705 INFO L226 Difference]: Without dead ends: 33 [2020-08-19 04:31:18,706 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-08-19 04:31:18,706 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-19 04:31:18,711 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-08-19 04:31:18,712 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-19 04:31:18,713 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 41 transitions. [2020-08-19 04:31:18,713 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 41 transitions. Word has length 28 [2020-08-19 04:31:18,713 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:31:18,713 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 41 transitions. [2020-08-19 04:31:18,713 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-19 04:31:18,714 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 41 transitions. [2020-08-19 04:31:18,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-19 04:31:18,715 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:31:18,715 INFO L422 BasicCegarLoop]: trace histogram [6, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:31:18,715 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-19 04:31:18,715 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:31:18,716 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:31:18,716 INFO L82 PathProgramCache]: Analyzing trace with hash 805703268, now seen corresponding path program 9 times [2020-08-19 04:31:18,716 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:31:18,716 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1496922090] [2020-08-19 04:31:18,717 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:31:18,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:18,805 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:31:18,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:18,810 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 25 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 04:31:18,811 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1496922090] [2020-08-19 04:31:18,811 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:31:18,811 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-19 04:31:18,811 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1963553532] [2020-08-19 04:31:18,812 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-19 04:31:18,812 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:31:18,813 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-19 04:31:18,813 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2020-08-19 04:31:18,813 INFO L87 Difference]: Start difference. First operand 33 states and 41 transitions. Second operand 10 states. [2020-08-19 04:31:19,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:31:19,009 INFO L93 Difference]: Finished difference Result 54 states and 70 transitions. [2020-08-19 04:31:19,010 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-19 04:31:19,010 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 32 [2020-08-19 04:31:19,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:31:19,011 INFO L225 Difference]: With dead ends: 54 [2020-08-19 04:31:19,011 INFO L226 Difference]: Without dead ends: 34 [2020-08-19 04:31:19,012 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-08-19 04:31:19,013 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-19 04:31:19,023 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-08-19 04:31:19,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-19 04:31:19,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 42 transitions. [2020-08-19 04:31:19,026 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 42 transitions. Word has length 32 [2020-08-19 04:31:19,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:31:19,027 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 42 transitions. [2020-08-19 04:31:19,029 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-19 04:31:19,029 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 42 transitions. [2020-08-19 04:31:19,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-19 04:31:19,034 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:31:19,034 INFO L422 BasicCegarLoop]: trace histogram [7, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:31:19,035 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-19 04:31:19,035 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:31:19,035 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:31:19,035 INFO L82 PathProgramCache]: Analyzing trace with hash 1833781516, now seen corresponding path program 10 times [2020-08-19 04:31:19,038 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:31:19,038 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1440963800] [2020-08-19 04:31:19,039 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:31:19,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:19,195 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:31:19,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:19,199 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 28 proven. 28 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 04:31:19,200 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1440963800] [2020-08-19 04:31:19,200 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:31:19,200 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-19 04:31:19,201 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [938790571] [2020-08-19 04:31:19,201 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-19 04:31:19,201 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:31:19,201 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-19 04:31:19,202 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=90, Unknown=0, NotChecked=0, Total=110 [2020-08-19 04:31:19,202 INFO L87 Difference]: Start difference. First operand 34 states and 42 transitions. Second operand 11 states. [2020-08-19 04:31:19,421 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:31:19,422 INFO L93 Difference]: Finished difference Result 55 states and 71 transitions. [2020-08-19 04:31:19,422 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-19 04:31:19,422 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 33 [2020-08-19 04:31:19,422 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:31:19,423 INFO L225 Difference]: With dead ends: 55 [2020-08-19 04:31:19,423 INFO L226 Difference]: Without dead ends: 35 [2020-08-19 04:31:19,424 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=108, Invalid=234, Unknown=0, NotChecked=0, Total=342 [2020-08-19 04:31:19,424 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-19 04:31:19,428 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-08-19 04:31:19,428 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-19 04:31:19,429 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 43 transitions. [2020-08-19 04:31:19,429 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 43 transitions. Word has length 33 [2020-08-19 04:31:19,429 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:31:19,429 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 43 transitions. [2020-08-19 04:31:19,429 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-19 04:31:19,429 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 43 transitions. [2020-08-19 04:31:19,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-19 04:31:19,430 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:31:19,430 INFO L422 BasicCegarLoop]: trace histogram [8, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:31:19,431 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-19 04:31:19,431 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:31:19,431 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:31:19,431 INFO L82 PathProgramCache]: Analyzing trace with hash -655531164, now seen corresponding path program 11 times [2020-08-19 04:31:19,431 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:31:19,432 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1708651881] [2020-08-19 04:31:19,432 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:31:19,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:19,543 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:31:19,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:19,546 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 31 proven. 36 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 04:31:19,547 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1708651881] [2020-08-19 04:31:19,547 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:31:19,547 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-19 04:31:19,548 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2068704634] [2020-08-19 04:31:19,548 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-19 04:31:19,548 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:31:19,548 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-19 04:31:19,549 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=110, Unknown=0, NotChecked=0, Total=132 [2020-08-19 04:31:19,549 INFO L87 Difference]: Start difference. First operand 35 states and 43 transitions. Second operand 12 states. [2020-08-19 04:31:19,786 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:31:19,787 INFO L93 Difference]: Finished difference Result 56 states and 72 transitions. [2020-08-19 04:31:19,787 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-19 04:31:19,787 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 34 [2020-08-19 04:31:19,787 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:31:19,788 INFO L225 Difference]: With dead ends: 56 [2020-08-19 04:31:19,788 INFO L226 Difference]: Without dead ends: 36 [2020-08-19 04:31:19,789 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=130, Invalid=290, Unknown=0, NotChecked=0, Total=420 [2020-08-19 04:31:19,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-19 04:31:19,796 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-08-19 04:31:19,796 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-19 04:31:19,799 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 44 transitions. [2020-08-19 04:31:19,799 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 44 transitions. Word has length 34 [2020-08-19 04:31:19,799 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:31:19,799 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 44 transitions. [2020-08-19 04:31:19,800 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-19 04:31:19,800 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 44 transitions. [2020-08-19 04:31:19,801 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-19 04:31:19,801 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:31:19,801 INFO L422 BasicCegarLoop]: trace histogram [9, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:31:19,802 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-19 04:31:19,802 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:31:19,802 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:31:19,802 INFO L82 PathProgramCache]: Analyzing trace with hash -514812916, now seen corresponding path program 12 times [2020-08-19 04:31:19,803 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:31:19,803 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2022435172] [2020-08-19 04:31:19,803 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:31:19,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:19,982 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:31:19,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:19,987 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 34 proven. 45 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 04:31:19,987 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2022435172] [2020-08-19 04:31:19,987 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:31:19,988 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-19 04:31:19,988 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [345427] [2020-08-19 04:31:19,988 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-19 04:31:19,988 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:31:19,989 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-19 04:31:19,989 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=132, Unknown=0, NotChecked=0, Total=156 [2020-08-19 04:31:19,989 INFO L87 Difference]: Start difference. First operand 36 states and 44 transitions. Second operand 13 states. [2020-08-19 04:31:20,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:31:20,320 INFO L93 Difference]: Finished difference Result 57 states and 73 transitions. [2020-08-19 04:31:20,320 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-19 04:31:20,321 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 35 [2020-08-19 04:31:20,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:31:20,321 INFO L225 Difference]: With dead ends: 57 [2020-08-19 04:31:20,322 INFO L226 Difference]: Without dead ends: 37 [2020-08-19 04:31:20,323 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=154, Invalid=352, Unknown=0, NotChecked=0, Total=506 [2020-08-19 04:31:20,324 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-19 04:31:20,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-08-19 04:31:20,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-19 04:31:20,329 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 45 transitions. [2020-08-19 04:31:20,329 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 45 transitions. Word has length 35 [2020-08-19 04:31:20,329 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:31:20,330 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 45 transitions. [2020-08-19 04:31:20,330 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-19 04:31:20,330 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 45 transitions. [2020-08-19 04:31:20,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-19 04:31:20,330 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:31:20,331 INFO L422 BasicCegarLoop]: trace histogram [10, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:31:20,331 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-19 04:31:20,331 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:31:20,331 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:31:20,331 INFO L82 PathProgramCache]: Analyzing trace with hash -447514524, now seen corresponding path program 13 times [2020-08-19 04:31:20,332 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:31:20,332 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [48593348] [2020-08-19 04:31:20,332 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:31:20,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:20,466 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:31:20,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:20,470 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 37 proven. 55 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 04:31:20,470 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [48593348] [2020-08-19 04:31:20,470 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:31:20,470 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-19 04:31:20,471 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1748017784] [2020-08-19 04:31:20,471 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-19 04:31:20,471 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:31:20,472 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-19 04:31:20,472 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=156, Unknown=0, NotChecked=0, Total=182 [2020-08-19 04:31:20,472 INFO L87 Difference]: Start difference. First operand 37 states and 45 transitions. Second operand 14 states. [2020-08-19 04:31:20,845 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:31:20,845 INFO L93 Difference]: Finished difference Result 58 states and 74 transitions. [2020-08-19 04:31:20,846 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-19 04:31:20,846 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 36 [2020-08-19 04:31:20,847 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:31:20,847 INFO L225 Difference]: With dead ends: 58 [2020-08-19 04:31:20,847 INFO L226 Difference]: Without dead ends: 38 [2020-08-19 04:31:20,849 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=180, Invalid=420, Unknown=0, NotChecked=0, Total=600 [2020-08-19 04:31:20,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-19 04:31:20,854 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-08-19 04:31:20,854 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-19 04:31:20,855 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 46 transitions. [2020-08-19 04:31:20,855 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 46 transitions. Word has length 36 [2020-08-19 04:31:20,856 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:31:20,856 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 46 transitions. [2020-08-19 04:31:20,856 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-19 04:31:20,856 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 46 transitions. [2020-08-19 04:31:20,857 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-19 04:31:20,857 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:31:20,857 INFO L422 BasicCegarLoop]: trace histogram [11, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:31:20,857 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-19 04:31:20,858 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:31:20,858 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:31:20,858 INFO L82 PathProgramCache]: Analyzing trace with hash 1638735628, now seen corresponding path program 14 times [2020-08-19 04:31:20,858 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:31:20,858 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1224899991] [2020-08-19 04:31:20,859 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:31:20,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:21,010 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:31:21,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:21,014 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 40 proven. 66 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 04:31:21,014 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1224899991] [2020-08-19 04:31:21,015 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:31:21,015 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-19 04:31:21,015 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2128562128] [2020-08-19 04:31:21,015 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-19 04:31:21,016 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:31:21,016 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-19 04:31:21,016 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=182, Unknown=0, NotChecked=0, Total=210 [2020-08-19 04:31:21,016 INFO L87 Difference]: Start difference. First operand 38 states and 46 transitions. Second operand 15 states. [2020-08-19 04:31:21,414 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:31:21,414 INFO L93 Difference]: Finished difference Result 59 states and 75 transitions. [2020-08-19 04:31:21,414 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-19 04:31:21,415 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 37 [2020-08-19 04:31:21,415 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:31:21,416 INFO L225 Difference]: With dead ends: 59 [2020-08-19 04:31:21,416 INFO L226 Difference]: Without dead ends: 39 [2020-08-19 04:31:21,417 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=208, Invalid=494, Unknown=0, NotChecked=0, Total=702 [2020-08-19 04:31:21,417 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-19 04:31:21,422 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-19 04:31:21,422 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-19 04:31:21,423 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 47 transitions. [2020-08-19 04:31:21,423 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 47 transitions. Word has length 37 [2020-08-19 04:31:21,423 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:31:21,423 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 47 transitions. [2020-08-19 04:31:21,423 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-19 04:31:21,424 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 47 transitions. [2020-08-19 04:31:21,424 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-19 04:31:21,424 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:31:21,424 INFO L422 BasicCegarLoop]: trace histogram [12, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:31:21,425 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-19 04:31:21,425 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:31:21,425 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:31:21,425 INFO L82 PathProgramCache]: Analyzing trace with hash 1887980900, now seen corresponding path program 15 times [2020-08-19 04:31:21,426 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:31:21,426 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [331285463] [2020-08-19 04:31:21,426 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:31:21,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:21,623 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:31:21,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:21,627 INFO L134 CoverageAnalysis]: Checked inductivity of 142 backedges. 43 proven. 78 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 04:31:21,627 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [331285463] [2020-08-19 04:31:21,628 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:31:21,628 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-19 04:31:21,628 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [913661534] [2020-08-19 04:31:21,631 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-19 04:31:21,631 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:31:21,632 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-19 04:31:21,632 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=210, Unknown=0, NotChecked=0, Total=240 [2020-08-19 04:31:21,633 INFO L87 Difference]: Start difference. First operand 39 states and 47 transitions. Second operand 16 states. [2020-08-19 04:31:22,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:31:22,086 INFO L93 Difference]: Finished difference Result 60 states and 76 transitions. [2020-08-19 04:31:22,087 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-19 04:31:22,087 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 38 [2020-08-19 04:31:22,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:31:22,088 INFO L225 Difference]: With dead ends: 60 [2020-08-19 04:31:22,088 INFO L226 Difference]: Without dead ends: 40 [2020-08-19 04:31:22,089 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=238, Invalid=574, Unknown=0, NotChecked=0, Total=812 [2020-08-19 04:31:22,090 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-19 04:31:22,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-08-19 04:31:22,096 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-19 04:31:22,096 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 48 transitions. [2020-08-19 04:31:22,096 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 48 transitions. Word has length 38 [2020-08-19 04:31:22,097 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:31:22,097 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 48 transitions. [2020-08-19 04:31:22,097 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-19 04:31:22,097 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 48 transitions. [2020-08-19 04:31:22,097 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-19 04:31:22,098 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:31:22,098 INFO L422 BasicCegarLoop]: trace histogram [13, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:31:22,098 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-19 04:31:22,098 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:31:22,099 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:31:22,099 INFO L82 PathProgramCache]: Analyzing trace with hash 1024649740, now seen corresponding path program 16 times [2020-08-19 04:31:22,099 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:31:22,099 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [720394124] [2020-08-19 04:31:22,099 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:31:22,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:22,307 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:31:22,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:22,312 INFO L134 CoverageAnalysis]: Checked inductivity of 158 backedges. 46 proven. 91 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 04:31:22,312 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [720394124] [2020-08-19 04:31:22,313 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:31:22,313 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-19 04:31:22,313 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1955748122] [2020-08-19 04:31:22,313 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-19 04:31:22,314 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:31:22,314 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-19 04:31:22,314 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=240, Unknown=0, NotChecked=0, Total=272 [2020-08-19 04:31:22,314 INFO L87 Difference]: Start difference. First operand 40 states and 48 transitions. Second operand 17 states. [2020-08-19 04:31:22,819 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:31:22,819 INFO L93 Difference]: Finished difference Result 61 states and 77 transitions. [2020-08-19 04:31:22,820 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-19 04:31:22,820 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 39 [2020-08-19 04:31:22,820 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:31:22,821 INFO L225 Difference]: With dead ends: 61 [2020-08-19 04:31:22,821 INFO L226 Difference]: Without dead ends: 41 [2020-08-19 04:31:22,822 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 104 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=270, Invalid=660, Unknown=0, NotChecked=0, Total=930 [2020-08-19 04:31:22,822 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-19 04:31:22,830 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-19 04:31:22,830 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-19 04:31:22,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 49 transitions. [2020-08-19 04:31:22,831 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 49 transitions. Word has length 39 [2020-08-19 04:31:22,831 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:31:22,831 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 49 transitions. [2020-08-19 04:31:22,832 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-19 04:31:22,832 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 49 transitions. [2020-08-19 04:31:22,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-19 04:31:22,832 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:31:22,833 INFO L422 BasicCegarLoop]: trace histogram [14, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:31:22,833 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-19 04:31:22,833 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:31:22,833 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:31:22,833 INFO L82 PathProgramCache]: Analyzing trace with hash 31187556, now seen corresponding path program 17 times [2020-08-19 04:31:22,834 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:31:22,834 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [228599323] [2020-08-19 04:31:22,834 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:31:22,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:23,080 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:31:23,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:23,085 INFO L134 CoverageAnalysis]: Checked inductivity of 175 backedges. 49 proven. 105 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 04:31:23,085 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [228599323] [2020-08-19 04:31:23,086 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:31:23,086 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-19 04:31:23,086 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [233012729] [2020-08-19 04:31:23,086 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-19 04:31:23,087 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:31:23,087 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-19 04:31:23,087 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=272, Unknown=0, NotChecked=0, Total=306 [2020-08-19 04:31:23,087 INFO L87 Difference]: Start difference. First operand 41 states and 49 transitions. Second operand 18 states. [2020-08-19 04:31:23,683 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:31:23,684 INFO L93 Difference]: Finished difference Result 62 states and 78 transitions. [2020-08-19 04:31:23,684 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-19 04:31:23,684 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 40 [2020-08-19 04:31:23,685 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:31:23,685 INFO L225 Difference]: With dead ends: 62 [2020-08-19 04:31:23,685 INFO L226 Difference]: Without dead ends: 42 [2020-08-19 04:31:23,686 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 119 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=304, Invalid=752, Unknown=0, NotChecked=0, Total=1056 [2020-08-19 04:31:23,687 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-19 04:31:23,692 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-08-19 04:31:23,692 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-19 04:31:23,693 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 50 transitions. [2020-08-19 04:31:23,693 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 50 transitions. Word has length 40 [2020-08-19 04:31:23,693 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:31:23,693 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 50 transitions. [2020-08-19 04:31:23,693 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-19 04:31:23,694 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 50 transitions. [2020-08-19 04:31:23,694 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-19 04:31:23,694 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:31:23,694 INFO L422 BasicCegarLoop]: trace histogram [15, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:31:23,694 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-19 04:31:23,695 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:31:23,695 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:31:23,695 INFO L82 PathProgramCache]: Analyzing trace with hash -701369076, now seen corresponding path program 18 times [2020-08-19 04:31:23,695 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:31:23,695 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [789941901] [2020-08-19 04:31:23,696 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:31:23,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:23,903 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:31:23,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:23,906 INFO L134 CoverageAnalysis]: Checked inductivity of 193 backedges. 52 proven. 120 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 04:31:23,907 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [789941901] [2020-08-19 04:31:23,907 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:31:23,907 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-19 04:31:23,907 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [813142645] [2020-08-19 04:31:23,908 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-19 04:31:23,908 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:31:23,908 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-19 04:31:23,908 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=306, Unknown=0, NotChecked=0, Total=342 [2020-08-19 04:31:23,908 INFO L87 Difference]: Start difference. First operand 42 states and 50 transitions. Second operand 19 states. [2020-08-19 04:31:24,577 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:31:24,578 INFO L93 Difference]: Finished difference Result 63 states and 79 transitions. [2020-08-19 04:31:24,578 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-19 04:31:24,578 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 41 [2020-08-19 04:31:24,579 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:31:24,579 INFO L225 Difference]: With dead ends: 63 [2020-08-19 04:31:24,579 INFO L226 Difference]: Without dead ends: 43 [2020-08-19 04:31:24,580 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 135 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=340, Invalid=850, Unknown=0, NotChecked=0, Total=1190 [2020-08-19 04:31:24,580 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-19 04:31:24,585 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-19 04:31:24,585 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-19 04:31:24,586 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 51 transitions. [2020-08-19 04:31:24,586 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 51 transitions. Word has length 41 [2020-08-19 04:31:24,586 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:31:24,586 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 51 transitions. [2020-08-19 04:31:24,586 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-19 04:31:24,586 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 51 transitions. [2020-08-19 04:31:24,587 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-19 04:31:24,587 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:31:24,587 INFO L422 BasicCegarLoop]: trace histogram [16, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:31:24,587 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-19 04:31:24,588 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:31:24,588 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:31:24,588 INFO L82 PathProgramCache]: Analyzing trace with hash -1935788188, now seen corresponding path program 19 times [2020-08-19 04:31:24,589 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:31:24,589 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1213441048] [2020-08-19 04:31:24,589 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:31:24,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:24,853 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:31:24,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:24,858 INFO L134 CoverageAnalysis]: Checked inductivity of 212 backedges. 55 proven. 136 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 04:31:24,859 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1213441048] [2020-08-19 04:31:24,859 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:31:24,859 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-19 04:31:24,859 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1493458482] [2020-08-19 04:31:24,859 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-19 04:31:24,860 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:31:24,860 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-19 04:31:24,860 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=342, Unknown=0, NotChecked=0, Total=380 [2020-08-19 04:31:24,860 INFO L87 Difference]: Start difference. First operand 43 states and 51 transitions. Second operand 20 states. [2020-08-19 04:31:25,592 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:31:25,592 INFO L93 Difference]: Finished difference Result 64 states and 80 transitions. [2020-08-19 04:31:25,595 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-19 04:31:25,595 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 42 [2020-08-19 04:31:25,596 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:31:25,596 INFO L225 Difference]: With dead ends: 64 [2020-08-19 04:31:25,596 INFO L226 Difference]: Without dead ends: 44 [2020-08-19 04:31:25,598 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 152 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=378, Invalid=954, Unknown=0, NotChecked=0, Total=1332 [2020-08-19 04:31:25,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-19 04:31:25,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-08-19 04:31:25,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-19 04:31:25,605 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 52 transitions. [2020-08-19 04:31:25,605 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 52 transitions. Word has length 42 [2020-08-19 04:31:25,606 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:31:25,606 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 52 transitions. [2020-08-19 04:31:25,606 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-19 04:31:25,606 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 52 transitions. [2020-08-19 04:31:25,606 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-19 04:31:25,606 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:31:25,607 INFO L422 BasicCegarLoop]: trace histogram [17, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:31:25,607 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-19 04:31:25,607 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:31:25,607 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:31:25,608 INFO L82 PathProgramCache]: Analyzing trace with hash -1548074996, now seen corresponding path program 20 times [2020-08-19 04:31:25,608 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:31:25,608 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1810713091] [2020-08-19 04:31:25,608 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:31:25,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:25,927 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:31:25,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:25,931 INFO L134 CoverageAnalysis]: Checked inductivity of 232 backedges. 58 proven. 153 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 04:31:25,932 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1810713091] [2020-08-19 04:31:25,932 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:31:25,932 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-19 04:31:25,932 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [214250187] [2020-08-19 04:31:25,933 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-19 04:31:25,933 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:31:25,933 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-19 04:31:25,933 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=380, Unknown=0, NotChecked=0, Total=420 [2020-08-19 04:31:25,934 INFO L87 Difference]: Start difference. First operand 44 states and 52 transitions. Second operand 21 states. [2020-08-19 04:31:26,770 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:31:26,770 INFO L93 Difference]: Finished difference Result 65 states and 81 transitions. [2020-08-19 04:31:26,771 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-19 04:31:26,771 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 43 [2020-08-19 04:31:26,771 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:31:26,772 INFO L225 Difference]: With dead ends: 65 [2020-08-19 04:31:26,772 INFO L226 Difference]: Without dead ends: 45 [2020-08-19 04:31:26,774 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 170 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=418, Invalid=1064, Unknown=0, NotChecked=0, Total=1482 [2020-08-19 04:31:26,775 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-19 04:31:26,781 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-08-19 04:31:26,781 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-19 04:31:26,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 53 transitions. [2020-08-19 04:31:26,781 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 53 transitions. Word has length 43 [2020-08-19 04:31:26,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:31:26,782 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 53 transitions. [2020-08-19 04:31:26,782 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-19 04:31:26,782 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 53 transitions. [2020-08-19 04:31:26,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-19 04:31:26,783 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:31:26,783 INFO L422 BasicCegarLoop]: trace histogram [18, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:31:26,783 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-19 04:31:26,783 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:31:26,783 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:31:26,784 INFO L82 PathProgramCache]: Analyzing trace with hash 1881099364, now seen corresponding path program 21 times [2020-08-19 04:31:26,784 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:31:26,784 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [348877608] [2020-08-19 04:31:26,784 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:31:26,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:27,115 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:31:27,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:27,121 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 61 proven. 171 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 04:31:27,121 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [348877608] [2020-08-19 04:31:27,121 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:31:27,121 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-19 04:31:27,121 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [121299543] [2020-08-19 04:31:27,122 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-19 04:31:27,122 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:31:27,122 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-19 04:31:27,123 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=420, Unknown=0, NotChecked=0, Total=462 [2020-08-19 04:31:27,123 INFO L87 Difference]: Start difference. First operand 45 states and 53 transitions. Second operand 22 states. [2020-08-19 04:31:28,027 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:31:28,028 INFO L93 Difference]: Finished difference Result 66 states and 82 transitions. [2020-08-19 04:31:28,028 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-19 04:31:28,028 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 44 [2020-08-19 04:31:28,029 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:31:28,029 INFO L225 Difference]: With dead ends: 66 [2020-08-19 04:31:28,029 INFO L226 Difference]: Without dead ends: 46 [2020-08-19 04:31:28,030 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 189 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=460, Invalid=1180, Unknown=0, NotChecked=0, Total=1640 [2020-08-19 04:31:28,031 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-19 04:31:28,037 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-08-19 04:31:28,038 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-19 04:31:28,038 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 54 transitions. [2020-08-19 04:31:28,038 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 54 transitions. Word has length 44 [2020-08-19 04:31:28,039 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:31:28,039 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 54 transitions. [2020-08-19 04:31:28,039 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-19 04:31:28,039 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 54 transitions. [2020-08-19 04:31:28,039 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-19 04:31:28,040 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:31:28,040 INFO L422 BasicCegarLoop]: trace histogram [19, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:31:28,040 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-19 04:31:28,040 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:31:28,040 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:31:28,040 INFO L82 PathProgramCache]: Analyzing trace with hash 811322124, now seen corresponding path program 22 times [2020-08-19 04:31:28,041 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:31:28,041 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1007600675] [2020-08-19 04:31:28,041 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:31:28,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:28,378 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:31:28,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:28,383 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 64 proven. 190 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 04:31:28,383 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1007600675] [2020-08-19 04:31:28,383 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:31:28,383 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-19 04:31:28,383 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [78246861] [2020-08-19 04:31:28,384 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-19 04:31:28,384 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:31:28,384 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-19 04:31:28,385 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=462, Unknown=0, NotChecked=0, Total=506 [2020-08-19 04:31:28,385 INFO L87 Difference]: Start difference. First operand 46 states and 54 transitions. Second operand 23 states. [2020-08-19 04:31:29,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:31:29,396 INFO L93 Difference]: Finished difference Result 67 states and 83 transitions. [2020-08-19 04:31:29,396 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-19 04:31:29,396 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 45 [2020-08-19 04:31:29,397 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:31:29,397 INFO L225 Difference]: With dead ends: 67 [2020-08-19 04:31:29,398 INFO L226 Difference]: Without dead ends: 47 [2020-08-19 04:31:29,399 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 209 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=504, Invalid=1302, Unknown=0, NotChecked=0, Total=1806 [2020-08-19 04:31:29,399 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-19 04:31:29,407 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-08-19 04:31:29,407 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-19 04:31:29,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 55 transitions. [2020-08-19 04:31:29,408 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 55 transitions. Word has length 45 [2020-08-19 04:31:29,408 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:31:29,408 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 55 transitions. [2020-08-19 04:31:29,408 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-19 04:31:29,409 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 55 transitions. [2020-08-19 04:31:29,409 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-19 04:31:29,409 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:31:29,410 INFO L422 BasicCegarLoop]: trace histogram [20, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:31:29,410 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-19 04:31:29,410 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:31:29,410 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:31:29,411 INFO L82 PathProgramCache]: Analyzing trace with hash 2007966052, now seen corresponding path program 23 times [2020-08-19 04:31:29,421 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:31:29,421 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1405209814] [2020-08-19 04:31:29,421 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:31:29,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:29,775 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:31:29,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:29,780 INFO L134 CoverageAnalysis]: Checked inductivity of 298 backedges. 67 proven. 210 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 04:31:29,780 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1405209814] [2020-08-19 04:31:29,780 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:31:29,780 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-19 04:31:29,780 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2091195725] [2020-08-19 04:31:29,781 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-19 04:31:29,781 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:31:29,781 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-19 04:31:29,782 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=506, Unknown=0, NotChecked=0, Total=552 [2020-08-19 04:31:29,782 INFO L87 Difference]: Start difference. First operand 47 states and 55 transitions. Second operand 24 states. [2020-08-19 04:31:30,896 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:31:30,897 INFO L93 Difference]: Finished difference Result 68 states and 84 transitions. [2020-08-19 04:31:30,898 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-19 04:31:30,898 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 46 [2020-08-19 04:31:30,898 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:31:30,899 INFO L225 Difference]: With dead ends: 68 [2020-08-19 04:31:30,899 INFO L226 Difference]: Without dead ends: 48 [2020-08-19 04:31:30,901 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 230 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=550, Invalid=1430, Unknown=0, NotChecked=0, Total=1980 [2020-08-19 04:31:30,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-19 04:31:30,906 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-08-19 04:31:30,907 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-19 04:31:30,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 56 transitions. [2020-08-19 04:31:30,907 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 56 transitions. Word has length 46 [2020-08-19 04:31:30,907 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:31:30,908 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 56 transitions. [2020-08-19 04:31:30,908 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-19 04:31:30,908 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 56 transitions. [2020-08-19 04:31:30,908 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-19 04:31:30,908 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:31:30,908 INFO L422 BasicCegarLoop]: trace histogram [21, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:31:30,909 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-19 04:31:30,909 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:31:30,909 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:31:30,909 INFO L82 PathProgramCache]: Analyzing trace with hash 449222156, now seen corresponding path program 24 times [2020-08-19 04:31:30,909 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:31:30,910 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [167889249] [2020-08-19 04:31:30,910 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:31:30,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:31,313 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:31:31,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:31,320 INFO L134 CoverageAnalysis]: Checked inductivity of 322 backedges. 70 proven. 231 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 04:31:31,320 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [167889249] [2020-08-19 04:31:31,321 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:31:31,321 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-19 04:31:31,321 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1815398486] [2020-08-19 04:31:31,322 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-19 04:31:31,322 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:31:31,322 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-19 04:31:31,322 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=552, Unknown=0, NotChecked=0, Total=600 [2020-08-19 04:31:31,323 INFO L87 Difference]: Start difference. First operand 48 states and 56 transitions. Second operand 25 states. [2020-08-19 04:31:32,543 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:31:32,544 INFO L93 Difference]: Finished difference Result 69 states and 85 transitions. [2020-08-19 04:31:32,544 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-19 04:31:32,545 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 47 [2020-08-19 04:31:32,545 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:31:32,545 INFO L225 Difference]: With dead ends: 69 [2020-08-19 04:31:32,546 INFO L226 Difference]: Without dead ends: 49 [2020-08-19 04:31:32,547 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 252 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=598, Invalid=1564, Unknown=0, NotChecked=0, Total=2162 [2020-08-19 04:31:32,548 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-19 04:31:32,554 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-19 04:31:32,554 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-19 04:31:32,555 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 57 transitions. [2020-08-19 04:31:32,555 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 57 transitions. Word has length 47 [2020-08-19 04:31:32,555 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:31:32,555 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 57 transitions. [2020-08-19 04:31:32,555 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-19 04:31:32,555 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 57 transitions. [2020-08-19 04:31:32,556 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-19 04:31:32,556 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:31:32,556 INFO L422 BasicCegarLoop]: trace histogram [22, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:31:32,556 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-19 04:31:32,556 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:31:32,557 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:31:32,557 INFO L82 PathProgramCache]: Analyzing trace with hash -627198364, now seen corresponding path program 25 times [2020-08-19 04:31:32,557 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:31:32,557 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1372757674] [2020-08-19 04:31:32,557 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:31:32,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:32,605 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:31:32,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:32,608 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 340 trivial. 0 not checked. [2020-08-19 04:31:32,608 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1372757674] [2020-08-19 04:31:32,608 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 04:31:32,609 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-19 04:31:32,609 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1223973137] [2020-08-19 04:31:32,609 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-19 04:31:32,609 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:31:32,610 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-19 04:31:32,610 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-19 04:31:32,610 INFO L87 Difference]: Start difference. First operand 49 states and 57 transitions. Second operand 5 states. [2020-08-19 04:31:32,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:31:32,631 INFO L93 Difference]: Finished difference Result 66 states and 82 transitions. [2020-08-19 04:31:32,631 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-19 04:31:32,631 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 48 [2020-08-19 04:31:32,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:31:32,631 INFO L225 Difference]: With dead ends: 66 [2020-08-19 04:31:32,631 INFO L226 Difference]: Without dead ends: 0 [2020-08-19 04:31:32,632 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-19 04:31:32,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-08-19 04:31:32,632 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-08-19 04:31:32,632 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-08-19 04:31:32,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-08-19 04:31:32,632 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 48 [2020-08-19 04:31:32,633 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:31:32,633 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-08-19 04:31:32,633 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-19 04:31:32,633 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-08-19 04:31:32,633 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-08-19 04:31:32,633 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-19 04:31:32,635 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-08-19 04:31:32,838 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-08-19 04:31:32,838 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-08-19 04:31:32,839 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-08-19 04:31:32,839 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-08-19 04:31:32,839 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-08-19 04:31:32,839 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-08-19 04:31:32,839 INFO L268 CegarLoopResult]: For program point assume_abort_if_notENTRY(lines 3 5) no Hoare annotation was computed. [2020-08-19 04:31:32,839 INFO L268 CegarLoopResult]: For program point L4(line 4) no Hoare annotation was computed. [2020-08-19 04:31:32,840 INFO L268 CegarLoopResult]: For program point L4-2(lines 3 5) no Hoare annotation was computed. [2020-08-19 04:31:32,840 INFO L268 CegarLoopResult]: For program point assume_abort_if_notEXIT(lines 3 5) no Hoare annotation was computed. [2020-08-19 04:31:32,840 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 13 30) no Hoare annotation was computed. [2020-08-19 04:31:32,840 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 13 30) no Hoare annotation was computed. [2020-08-19 04:31:32,840 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 13 30) the Hoare annotation is: true [2020-08-19 04:31:32,841 INFO L268 CegarLoopResult]: For program point L28(line 28) no Hoare annotation was computed. [2020-08-19 04:31:32,841 INFO L264 CegarLoopResult]: At program point L24-2(lines 24 26) the Hoare annotation is: (= main_~k~0 4) [2020-08-19 04:31:32,841 INFO L264 CegarLoopResult]: At program point L24-3(lines 18 27) the Hoare annotation is: (or (= main_~k~0 4) (and (<= main_~i~0 0) (<= (+ main_~j~0 100) 0))) [2020-08-19 04:31:32,841 INFO L264 CegarLoopResult]: At program point L20-2(lines 20 22) the Hoare annotation is: (or (= main_~k~0 4) (<= main_~i~0 1)) [2020-08-19 04:31:32,841 INFO L268 CegarLoopResult]: For program point L20-3(lines 20 22) no Hoare annotation was computed. [2020-08-19 04:31:32,841 INFO L264 CegarLoopResult]: At program point L18-2(lines 18 27) the Hoare annotation is: (= main_~k~0 4) [2020-08-19 04:31:32,841 INFO L271 CegarLoopResult]: At program point __VERIFIER_assertENTRY(lines 6 11) the Hoare annotation is: true [2020-08-19 04:31:32,841 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertEXIT(lines 6 11) no Hoare annotation was computed. [2020-08-19 04:31:32,841 INFO L268 CegarLoopResult]: For program point L8(line 8) no Hoare annotation was computed. [2020-08-19 04:31:32,842 INFO L268 CegarLoopResult]: For program point L7(lines 7 9) no Hoare annotation was computed. [2020-08-19 04:31:32,842 INFO L268 CegarLoopResult]: For program point L7-2(lines 6 11) no Hoare annotation was computed. [2020-08-19 04:31:32,842 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 8) no Hoare annotation was computed. [2020-08-19 04:31:32,857 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 19.08 04:31:32 BoogieIcfgContainer [2020-08-19 04:31:32,857 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-19 04:31:32,860 INFO L168 Benchmark]: Toolchain (without parser) took 16747.84 ms. Allocated memory was 140.0 MB in the beginning and 356.5 MB in the end (delta: 216.5 MB). Free memory was 103.1 MB in the beginning and 239.7 MB in the end (delta: -136.6 MB). Peak memory consumption was 79.9 MB. Max. memory is 7.1 GB. [2020-08-19 04:31:32,861 INFO L168 Benchmark]: CDTParser took 0.25 ms. Allocated memory is still 140.0 MB. Free memory was 121.5 MB in the beginning and 121.1 MB in the end (delta: 419.8 kB). Peak memory consumption was 419.8 kB. Max. memory is 7.1 GB. [2020-08-19 04:31:32,861 INFO L168 Benchmark]: CACSL2BoogieTranslator took 277.19 ms. Allocated memory is still 140.0 MB. Free memory was 102.7 MB in the beginning and 93.2 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. [2020-08-19 04:31:32,862 INFO L168 Benchmark]: Boogie Preprocessor took 102.17 ms. Allocated memory was 140.0 MB in the beginning and 201.9 MB in the end (delta: 61.9 MB). Free memory was 93.2 MB in the beginning and 180.3 MB in the end (delta: -87.1 MB). Peak memory consumption was 12.9 MB. Max. memory is 7.1 GB. [2020-08-19 04:31:32,863 INFO L168 Benchmark]: RCFGBuilder took 254.31 ms. Allocated memory is still 201.9 MB. Free memory was 180.3 MB in the beginning and 167.6 MB in the end (delta: 12.7 MB). Peak memory consumption was 12.7 MB. Max. memory is 7.1 GB. [2020-08-19 04:31:32,863 INFO L168 Benchmark]: TraceAbstraction took 16104.96 ms. Allocated memory was 201.9 MB in the beginning and 356.5 MB in the end (delta: 154.7 MB). Free memory was 166.7 MB in the beginning and 239.7 MB in the end (delta: -73.1 MB). Peak memory consumption was 81.6 MB. Max. memory is 7.1 GB. [2020-08-19 04:31:32,867 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.25 ms. Allocated memory is still 140.0 MB. Free memory was 121.5 MB in the beginning and 121.1 MB in the end (delta: 419.8 kB). Peak memory consumption was 419.8 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 277.19 ms. Allocated memory is still 140.0 MB. Free memory was 102.7 MB in the beginning and 93.2 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 102.17 ms. Allocated memory was 140.0 MB in the beginning and 201.9 MB in the end (delta: 61.9 MB). Free memory was 93.2 MB in the beginning and 180.3 MB in the end (delta: -87.1 MB). Peak memory consumption was 12.9 MB. Max. memory is 7.1 GB. * RCFGBuilder took 254.31 ms. Allocated memory is still 201.9 MB. Free memory was 180.3 MB in the beginning and 167.6 MB in the end (delta: 12.7 MB). Peak memory consumption was 12.7 MB. Max. memory is 7.1 GB. * TraceAbstraction took 16104.96 ms. Allocated memory was 201.9 MB in the beginning and 356.5 MB in the end (delta: 154.7 MB). Free memory was 166.7 MB in the beginning and 239.7 MB in the end (delta: -73.1 MB). Peak memory consumption was 81.6 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 8]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 24]: Loop Invariant Derived loop invariant: k == 4 - InvariantResult [Line: 20]: Loop Invariant Derived loop invariant: k == 4 || i <= 1 - InvariantResult [Line: 18]: Loop Invariant Derived loop invariant: k == 4 || (i <= 0 && j + 100 <= 0) - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 25 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 15.8s, OverallIterations: 28, TraceHistogramMax: 22, AutomataDifference: 10.7s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.2s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 404 SDtfs, 15 SDslu, 3185 SDs, 0 SdLazy, 1131 SolverSat, 487 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 652 GetRequests, 112 SyntacticMatches, 0 SemanticMatches, 540 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2002 ImplicationChecksByTransitivity, 12.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=49occurred in iteration=27, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.2s AutomataMinimizationTime, 28 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 9 LocationsWithAnnotation, 37 PreInvPairs, 73 NumberOfFragments, 31 HoareAnnotationTreeSize, 37 FomulaSimplifications, 3216 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 9 FomulaSimplificationsInter, 271 FormulaSimplificationTreeSizeReductionInter, 0.1s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 4.1s InterpolantComputationTime, 871 NumberOfCodeBlocks, 871 NumberOfCodeBlocksAsserted, 28 NumberOfCheckSat, 843 ConstructedInterpolants, 0 QuantifiedInterpolants, 100903 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 28 InterpolantComputations, 4 PerfectInterpolantSequences, 1512/3323 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...