/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 interpolation-heuristic=FIRST --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-lit/ddlm2013.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 15:03:33,674 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 15:03:33,677 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 15:03:33,701 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 15:03:33,701 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 15:03:33,702 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 15:03:33,703 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 15:03:33,705 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 15:03:33,707 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 15:03:33,708 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 15:03:33,709 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 15:03:33,710 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 15:03:33,710 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 15:03:33,711 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 15:03:33,712 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 15:03:33,713 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 15:03:33,714 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 15:03:33,715 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 15:03:33,717 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 15:03:33,719 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 15:03:33,720 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 15:03:33,722 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 15:03:33,723 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 15:03:33,724 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 15:03:33,726 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-21 15:03:33,734 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 15:03:33,735 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 15:03:33,736 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 15:03:33,737 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-21 15:03:33,765 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 15:03:33,765 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 15:03:33,766 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 15:03:33,767 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 15:03:33,767 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 15:03:33,767 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 15:03:33,767 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 15:03:33,768 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 15:03:33,768 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 15:03:33,768 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 15:03:33,768 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 15:03:33,768 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 15:03:33,769 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 15:03:33,769 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 15:03:33,769 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 15:03:33,769 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 15:03:33,769 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 15:03:33,770 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 15:03:33,770 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 15:03:33,770 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 15:03:33,770 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 15:03:33,771 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 15:03:33,771 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 15:03:33,771 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 15:03:33,771 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 15:03:33,772 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 15:03:33,772 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 15:03:33,772 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 15:03:33,772 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 15:03:33,772 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 -> interpolation-heuristic=FIRST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> interpolation-heuristic=FIRST;log-additional-information=true; [2020-08-21 15:03:34,114 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 15:03:34,136 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 15:03:34,142 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 15:03:34,143 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 15:03:34,144 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 15:03:34,145 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/ddlm2013.i [2020-08-21 15:03:34,220 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/efc1d2e56/b824ba88110f44cea4b81d79a741604b/FLAGec46363ed [2020-08-21 15:03:34,645 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 15:03:34,645 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-lit/ddlm2013.i [2020-08-21 15:03:34,652 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/efc1d2e56/b824ba88110f44cea4b81d79a741604b/FLAGec46363ed [2020-08-21 15:03:34,673 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/efc1d2e56/b824ba88110f44cea4b81d79a741604b [2020-08-21 15:03:34,683 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 15:03:34,685 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 15:03:34,688 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 15:03:34,688 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 15:03:34,692 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 15:03:34,693 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 03:03:34" (1/1) ... [2020-08-21 15:03:34,696 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2d4f5ef3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:03:34, skipping insertion in model container [2020-08-21 15:03:34,696 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 03:03:34" (1/1) ... [2020-08-21 15:03:34,704 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 15:03:34,723 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 15:03:34,885 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 15:03:34,888 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 15:03:34,903 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 15:03:34,916 INFO L208 MainTranslator]: Completed translation [2020-08-21 15:03:34,916 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:03:34 WrapperNode [2020-08-21 15:03:34,917 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 15:03:34,917 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 15:03:34,917 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 15:03:34,918 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 15:03:34,929 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:03:34" (1/1) ... [2020-08-21 15:03:34,929 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:03:34" (1/1) ... [2020-08-21 15:03:35,008 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:03:34" (1/1) ... [2020-08-21 15:03:35,008 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:03:34" (1/1) ... [2020-08-21 15:03:35,021 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:03:34" (1/1) ... [2020-08-21 15:03:35,028 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:03:34" (1/1) ... [2020-08-21 15:03:35,029 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:03:34" (1/1) ... [2020-08-21 15:03:35,036 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 15:03:35,039 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 15:03:35,039 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 15:03:35,039 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 15:03:35,040 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:03:34" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 15:03:35,104 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 15:03:35,104 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 15:03:35,104 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-21 15:03:35,104 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-21 15:03:35,104 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 15:03:35,105 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 15:03:35,105 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-21 15:03:35,105 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-21 15:03:35,105 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-21 15:03:35,105 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-21 15:03:35,105 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 15:03:35,105 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 15:03:35,106 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 15:03:35,315 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 15:03:35,315 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-21 15:03:35,319 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 03:03:35 BoogieIcfgContainer [2020-08-21 15:03:35,319 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 15:03:35,320 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 15:03:35,321 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 15:03:35,324 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 15:03:35,324 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 03:03:34" (1/3) ... [2020-08-21 15:03:35,325 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4737674 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 03:03:35, skipping insertion in model container [2020-08-21 15:03:35,325 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:03:34" (2/3) ... [2020-08-21 15:03:35,326 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4737674 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 03:03:35, skipping insertion in model container [2020-08-21 15:03:35,326 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 03:03:35" (3/3) ... [2020-08-21 15:03:35,328 INFO L109 eAbstractionObserver]: Analyzing ICFG ddlm2013.i [2020-08-21 15:03:35,339 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 15:03:35,346 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 15:03:35,365 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 15:03:35,392 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 15:03:35,393 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 15:03:35,393 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 15:03:35,393 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 15:03:35,393 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 15:03:35,393 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 15:03:35,394 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 15:03:35,394 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 15:03:35,418 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2020-08-21 15:03:35,432 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-21 15:03:35,432 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:03:35,434 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:03:35,434 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:03:35,443 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:03:35,443 INFO L82 PathProgramCache]: Analyzing trace with hash -917653371, now seen corresponding path program 1 times [2020-08-21 15:03:35,462 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:03:35,462 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2018161703] [2020-08-21 15:03:35,477 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:03:35,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:03:35,604 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:03:35,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:03:35,611 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:03:35,612 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2018161703] [2020-08-21 15:03:35,614 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 15:03:35,614 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-08-21 15:03:35,615 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [782325228] [2020-08-21 15:03:35,620 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-08-21 15:03:35,621 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:03:35,635 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-08-21 15:03:35,636 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-21 15:03:35,638 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 2 states. [2020-08-21 15:03:35,662 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:03:35,662 INFO L93 Difference]: Finished difference Result 35 states and 42 transitions. [2020-08-21 15:03:35,662 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-08-21 15:03:35,664 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 12 [2020-08-21 15:03:35,664 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:03:35,673 INFO L225 Difference]: With dead ends: 35 [2020-08-21 15:03:35,674 INFO L226 Difference]: Without dead ends: 15 [2020-08-21 15:03:35,678 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-21 15:03:35,696 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-21 15:03:35,713 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-21 15:03:35,715 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-21 15:03:35,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-08-21 15:03:35,717 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 12 [2020-08-21 15:03:35,718 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:03:35,718 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-08-21 15:03:35,718 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-08-21 15:03:35,718 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-08-21 15:03:35,719 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-21 15:03:35,719 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:03:35,719 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:03:35,720 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 15:03:35,720 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:03:35,720 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:03:35,721 INFO L82 PathProgramCache]: Analyzing trace with hash -1750778295, now seen corresponding path program 1 times [2020-08-21 15:03:35,721 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:03:35,721 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1054176054] [2020-08-21 15:03:35,722 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:03:35,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:03:35,769 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:03:35,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:03:35,773 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:03:35,773 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1054176054] [2020-08-21 15:03:35,774 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 15:03:35,774 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 15:03:35,774 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1865749624] [2020-08-21 15:03:35,776 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 15:03:35,777 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:03:35,777 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 15:03:35,777 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 15:03:35,778 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 3 states. [2020-08-21 15:03:35,792 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:03:35,792 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2020-08-21 15:03:35,793 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 15:03:35,793 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 13 [2020-08-21 15:03:35,793 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:03:35,794 INFO L225 Difference]: With dead ends: 24 [2020-08-21 15:03:35,794 INFO L226 Difference]: Without dead ends: 15 [2020-08-21 15:03:35,795 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 15:03:35,796 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-21 15:03:35,799 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-21 15:03:35,799 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-21 15:03:35,800 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2020-08-21 15:03:35,800 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 13 [2020-08-21 15:03:35,800 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:03:35,800 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2020-08-21 15:03:35,801 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 15:03:35,801 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2020-08-21 15:03:35,801 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-21 15:03:35,801 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:03:35,802 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:03:35,802 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 15:03:35,802 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:03:35,803 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:03:35,803 INFO L82 PathProgramCache]: Analyzing trace with hash -941431669, now seen corresponding path program 1 times [2020-08-21 15:03:35,803 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:03:35,803 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1642616397] [2020-08-21 15:03:35,804 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:03:35,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:03:36,072 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:03:36,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:03:36,079 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:03:36,079 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1642616397] [2020-08-21 15:03:36,080 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 15:03:36,080 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 15:03:36,081 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1956252035] [2020-08-21 15:03:36,081 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 15:03:36,081 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:03:36,082 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 15:03:36,082 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 15:03:36,083 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 5 states. [2020-08-21 15:03:36,121 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:03:36,121 INFO L93 Difference]: Finished difference Result 23 states and 24 transitions. [2020-08-21 15:03:36,122 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 15:03:36,122 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-08-21 15:03:36,123 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:03:36,123 INFO L225 Difference]: With dead ends: 23 [2020-08-21 15:03:36,123 INFO L226 Difference]: Without dead ends: 17 [2020-08-21 15:03:36,124 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-21 15:03:36,125 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-21 15:03:36,129 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-21 15:03:36,129 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-21 15:03:36,130 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2020-08-21 15:03:36,130 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 13 [2020-08-21 15:03:36,131 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:03:36,131 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2020-08-21 15:03:36,131 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 15:03:36,131 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2020-08-21 15:03:36,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-21 15:03:36,132 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:03:36,132 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:03:36,133 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 15:03:36,133 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:03:36,133 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:03:36,133 INFO L82 PathProgramCache]: Analyzing trace with hash 447870728, now seen corresponding path program 1 times [2020-08-21 15:03:36,134 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:03:36,134 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1022385063] [2020-08-21 15:03:36,135 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:03:36,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:03:36,314 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:03:36,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:03:36,320 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:03:36,321 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1022385063] [2020-08-21 15:03:36,321 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 15:03:36,321 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 15:03:36,321 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1201477586] [2020-08-21 15:03:36,322 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 15:03:36,322 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:03:36,323 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 15:03:36,325 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 15:03:36,325 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand 4 states. [2020-08-21 15:03:36,355 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:03:36,355 INFO L93 Difference]: Finished difference Result 26 states and 28 transitions. [2020-08-21 15:03:36,357 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 15:03:36,357 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 16 [2020-08-21 15:03:36,357 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:03:36,358 INFO L225 Difference]: With dead ends: 26 [2020-08-21 15:03:36,358 INFO L226 Difference]: Without dead ends: 17 [2020-08-21 15:03:36,359 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 15:03:36,360 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-21 15:03:36,367 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-21 15:03:36,367 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-21 15:03:36,368 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-21 15:03:36,368 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 16 [2020-08-21 15:03:36,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:03:36,369 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-21 15:03:36,370 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 15:03:36,370 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-21 15:03:36,372 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-21 15:03:36,372 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:03:36,372 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:03:36,373 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 15:03:36,373 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:03:36,373 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:03:36,373 INFO L82 PathProgramCache]: Analyzing trace with hash 1257217354, now seen corresponding path program 1 times [2020-08-21 15:03:36,374 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:03:36,374 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1971144109] [2020-08-21 15:03:36,374 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:03:36,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:03:36,587 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:03:36,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:03:36,591 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:03:36,592 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1971144109] [2020-08-21 15:03:36,592 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:03:36,592 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 15:03:36,592 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [67940167] [2020-08-21 15:03:36,593 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 15:03:36,593 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:03:36,594 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 15:03:36,594 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-08-21 15:03:36,594 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 7 states. [2020-08-21 15:03:36,702 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:03:36,702 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-08-21 15:03:36,703 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 15:03:36,703 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 16 [2020-08-21 15:03:36,703 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:03:36,704 INFO L225 Difference]: With dead ends: 26 [2020-08-21 15:03:36,704 INFO L226 Difference]: Without dead ends: 20 [2020-08-21 15:03:36,705 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2020-08-21 15:03:36,705 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-21 15:03:36,708 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-21 15:03:36,709 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-21 15:03:36,709 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2020-08-21 15:03:36,710 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 16 [2020-08-21 15:03:36,710 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:03:36,710 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2020-08-21 15:03:36,710 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 15:03:36,710 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2020-08-21 15:03:36,711 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-21 15:03:36,711 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:03:36,711 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:03:36,712 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 15:03:36,712 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:03:36,712 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:03:36,712 INFO L82 PathProgramCache]: Analyzing trace with hash -1335969749, now seen corresponding path program 2 times [2020-08-21 15:03:36,713 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:03:36,713 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [480623070] [2020-08-21 15:03:36,713 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:03:36,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:03:36,954 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:03:36,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:03:36,958 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:03:36,959 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [480623070] [2020-08-21 15:03:36,959 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:03:36,959 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 15:03:36,960 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1999949098] [2020-08-21 15:03:36,960 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 15:03:36,960 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:03:36,961 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 15:03:36,961 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-08-21 15:03:36,961 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 9 states. [2020-08-21 15:03:37,101 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:03:37,101 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2020-08-21 15:03:37,102 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 15:03:37,102 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2020-08-21 15:03:37,102 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:03:37,103 INFO L225 Difference]: With dead ends: 29 [2020-08-21 15:03:37,103 INFO L226 Difference]: Without dead ends: 23 [2020-08-21 15:03:37,104 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2020-08-21 15:03:37,104 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-21 15:03:37,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-08-21 15:03:37,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-21 15:03:37,108 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-08-21 15:03:37,108 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 19 [2020-08-21 15:03:37,109 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:03:37,109 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-08-21 15:03:37,109 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 15:03:37,109 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-08-21 15:03:37,110 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-21 15:03:37,110 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:03:37,110 INFO L422 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:03:37,110 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 15:03:37,110 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:03:37,111 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:03:37,111 INFO L82 PathProgramCache]: Analyzing trace with hash -1396202070, now seen corresponding path program 3 times [2020-08-21 15:03:37,111 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:03:37,111 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1841677756] [2020-08-21 15:03:37,111 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:03:37,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:03:37,379 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:03:37,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:03:37,384 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:03:37,384 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1841677756] [2020-08-21 15:03:37,385 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:03:37,385 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 15:03:37,385 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1351334125] [2020-08-21 15:03:37,386 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 15:03:37,386 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:03:37,386 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 15:03:37,387 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2020-08-21 15:03:37,387 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 11 states. [2020-08-21 15:03:45,878 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:03:45,879 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-08-21 15:03:45,880 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 15:03:45,880 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 22 [2020-08-21 15:03:45,880 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:03:45,881 INFO L225 Difference]: With dead ends: 32 [2020-08-21 15:03:45,881 INFO L226 Difference]: Without dead ends: 26 [2020-08-21 15:03:45,882 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=33, Invalid=147, Unknown=2, NotChecked=0, Total=182 [2020-08-21 15:03:45,882 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-21 15:03:45,886 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-08-21 15:03:45,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-21 15:03:45,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2020-08-21 15:03:45,888 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 22 [2020-08-21 15:03:45,888 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:03:45,889 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2020-08-21 15:03:45,889 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 15:03:45,889 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2020-08-21 15:03:45,889 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-21 15:03:45,890 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:03:45,890 INFO L422 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:03:45,890 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 15:03:45,890 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:03:45,891 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:03:45,891 INFO L82 PathProgramCache]: Analyzing trace with hash -480947253, now seen corresponding path program 4 times [2020-08-21 15:03:45,891 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:03:45,891 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [780901703] [2020-08-21 15:03:45,891 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:03:45,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:03:46,246 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:03:46,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:03:46,251 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:03:46,252 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [780901703] [2020-08-21 15:03:46,252 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:03:46,252 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 15:03:46,253 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [923602491] [2020-08-21 15:03:46,253 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 15:03:46,253 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:03:46,254 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 15:03:46,254 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2020-08-21 15:03:46,254 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 13 states. [2020-08-21 15:03:46,472 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:03:46,472 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2020-08-21 15:03:46,472 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 15:03:46,472 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 25 [2020-08-21 15:03:46,473 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:03:46,473 INFO L225 Difference]: With dead ends: 35 [2020-08-21 15:03:46,474 INFO L226 Difference]: Without dead ends: 29 [2020-08-21 15:03:46,474 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=37, Invalid=203, Unknown=0, NotChecked=0, Total=240 [2020-08-21 15:03:46,475 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-21 15:03:46,477 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-08-21 15:03:46,478 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-21 15:03:46,479 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-08-21 15:03:46,479 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 25 [2020-08-21 15:03:46,479 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:03:46,479 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-08-21 15:03:46,479 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 15:03:46,480 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-08-21 15:03:46,480 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-21 15:03:46,480 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:03:46,481 INFO L422 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:03:46,481 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 15:03:46,481 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:03:46,481 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:03:46,482 INFO L82 PathProgramCache]: Analyzing trace with hash 1422910986, now seen corresponding path program 5 times [2020-08-21 15:03:46,482 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:03:46,482 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [275740830] [2020-08-21 15:03:46,482 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:03:46,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:03:46,879 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:03:46,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:03:46,885 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:03:46,886 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [275740830] [2020-08-21 15:03:46,886 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:03:46,886 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-21 15:03:46,886 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [737256055] [2020-08-21 15:03:46,887 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-21 15:03:46,887 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:03:46,887 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-21 15:03:46,888 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2020-08-21 15:03:46,888 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 15 states. [2020-08-21 15:03:51,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:03:51,403 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-08-21 15:03:51,403 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-21 15:03:51,404 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 28 [2020-08-21 15:03:51,404 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:03:51,404 INFO L225 Difference]: With dead ends: 38 [2020-08-21 15:03:51,405 INFO L226 Difference]: Without dead ends: 32 [2020-08-21 15:03:51,405 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=41, Invalid=265, Unknown=0, NotChecked=0, Total=306 [2020-08-21 15:03:51,410 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-21 15:03:51,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-08-21 15:03:51,415 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-21 15:03:51,416 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2020-08-21 15:03:51,416 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 28 [2020-08-21 15:03:51,417 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:03:51,417 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2020-08-21 15:03:51,417 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-21 15:03:51,417 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2020-08-21 15:03:51,418 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-21 15:03:51,418 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:03:51,418 INFO L422 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:03:51,418 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 15:03:51,419 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:03:51,423 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:03:51,423 INFO L82 PathProgramCache]: Analyzing trace with hash -74401941, now seen corresponding path program 6 times [2020-08-21 15:03:51,424 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:03:51,424 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1976705505] [2020-08-21 15:03:51,424 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:03:51,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:03:51,894 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:03:51,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:03:51,903 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:03:51,904 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1976705505] [2020-08-21 15:03:51,904 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:03:51,904 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-21 15:03:51,904 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2016504186] [2020-08-21 15:03:51,905 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-21 15:03:51,905 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:03:51,906 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-21 15:03:51,906 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2020-08-21 15:03:51,906 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 17 states. [2020-08-21 15:04:02,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:04:02,617 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2020-08-21 15:04:02,618 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-21 15:04:02,618 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 31 [2020-08-21 15:04:02,618 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:04:02,619 INFO L225 Difference]: With dead ends: 41 [2020-08-21 15:04:02,619 INFO L226 Difference]: Without dead ends: 35 [2020-08-21 15:04:02,620 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=45, Invalid=334, Unknown=1, NotChecked=0, Total=380 [2020-08-21 15:04:02,620 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-21 15:04:02,623 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-08-21 15:04:02,623 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-21 15:04:02,624 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-08-21 15:04:02,624 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 31 [2020-08-21 15:04:02,625 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:04:02,625 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-08-21 15:04:02,625 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-21 15:04:02,625 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-08-21 15:04:02,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-21 15:04:02,626 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:04:02,626 INFO L422 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:04:02,626 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 15:04:02,627 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:04:02,627 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:04:02,627 INFO L82 PathProgramCache]: Analyzing trace with hash 1006526058, now seen corresponding path program 7 times [2020-08-21 15:04:02,627 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:04:02,627 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1710309830] [2020-08-21 15:04:02,628 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:04:02,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:04:03,193 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:04:03,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:04:03,201 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:04:03,201 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1710309830] [2020-08-21 15:04:03,201 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:04:03,202 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-21 15:04:03,202 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [573444297] [2020-08-21 15:04:03,202 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-21 15:04:03,203 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:04:03,203 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-21 15:04:03,203 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2020-08-21 15:04:03,203 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 19 states. [2020-08-21 15:04:11,944 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:04:11,945 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-08-21 15:04:11,945 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-21 15:04:11,945 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 34 [2020-08-21 15:04:11,946 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:04:11,947 INFO L225 Difference]: With dead ends: 44 [2020-08-21 15:04:11,947 INFO L226 Difference]: Without dead ends: 38 [2020-08-21 15:04:11,947 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=49, Invalid=412, Unknown=1, NotChecked=0, Total=462 [2020-08-21 15:04:11,948 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-21 15:04:11,954 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-08-21 15:04:11,954 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-21 15:04:11,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2020-08-21 15:04:11,955 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 34 [2020-08-21 15:04:11,955 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:04:11,955 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2020-08-21 15:04:11,955 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-21 15:04:11,955 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2020-08-21 15:04:11,958 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-21 15:04:11,958 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:04:11,958 INFO L422 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:04:11,959 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 15:04:11,961 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:04:11,961 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:04:11,962 INFO L82 PathProgramCache]: Analyzing trace with hash -732241141, now seen corresponding path program 8 times [2020-08-21 15:04:11,962 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:04:11,962 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1082497552] [2020-08-21 15:04:11,963 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:04:12,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:04:12,607 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:04:12,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:04:12,615 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:04:12,615 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1082497552] [2020-08-21 15:04:12,615 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:04:12,615 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-21 15:04:12,616 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [481631593] [2020-08-21 15:04:12,616 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-21 15:04:12,616 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:04:12,617 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-21 15:04:12,617 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=381, Unknown=0, NotChecked=0, Total=420 [2020-08-21 15:04:12,617 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 21 states. [2020-08-21 15:04:13,074 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:04:13,074 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2020-08-21 15:04:13,076 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-21 15:04:13,077 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 37 [2020-08-21 15:04:13,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:04:13,077 INFO L225 Difference]: With dead ends: 47 [2020-08-21 15:04:13,078 INFO L226 Difference]: Without dead ends: 41 [2020-08-21 15:04:13,078 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=53, Invalid=499, Unknown=0, NotChecked=0, Total=552 [2020-08-21 15:04:13,079 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-21 15:04:13,081 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-21 15:04:13,082 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-21 15:04:13,082 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-08-21 15:04:13,083 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 37 [2020-08-21 15:04:13,083 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:04:13,083 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-08-21 15:04:13,083 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-21 15:04:13,083 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-08-21 15:04:13,084 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-21 15:04:13,084 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:04:13,084 INFO L422 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:04:13,085 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 15:04:13,085 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:04:13,085 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:04:13,085 INFO L82 PathProgramCache]: Analyzing trace with hash 1254690506, now seen corresponding path program 9 times [2020-08-21 15:04:13,086 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:04:13,086 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1335948810] [2020-08-21 15:04:13,086 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:04:13,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:04:13,849 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:04:13,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:04:13,861 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:04:13,862 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1335948810] [2020-08-21 15:04:13,862 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:04:13,862 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-21 15:04:13,863 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1140040579] [2020-08-21 15:04:13,864 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-21 15:04:13,864 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:04:13,865 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-21 15:04:13,865 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=463, Unknown=0, NotChecked=0, Total=506 [2020-08-21 15:04:13,865 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 23 states. [2020-08-21 15:04:35,127 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:04:35,127 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-08-21 15:04:35,128 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-21 15:04:35,128 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 40 [2020-08-21 15:04:35,128 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:04:35,129 INFO L225 Difference]: With dead ends: 50 [2020-08-21 15:04:35,129 INFO L226 Difference]: Without dead ends: 44 [2020-08-21 15:04:35,129 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 15.3s TimeCoverageRelationStatistics Valid=57, Invalid=586, Unknown=7, NotChecked=0, Total=650 [2020-08-21 15:04:35,130 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-21 15:04:35,133 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-08-21 15:04:35,133 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-21 15:04:35,133 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2020-08-21 15:04:35,134 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 40 [2020-08-21 15:04:35,134 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:04:35,134 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2020-08-21 15:04:35,134 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-21 15:04:35,134 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2020-08-21 15:04:35,135 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-21 15:04:35,135 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:04:35,135 INFO L422 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:04:35,136 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 15:04:35,136 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:04:35,136 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:04:35,136 INFO L82 PathProgramCache]: Analyzing trace with hash 696112811, now seen corresponding path program 10 times [2020-08-21 15:04:35,136 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:04:35,137 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2070530417] [2020-08-21 15:04:35,137 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:04:35,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:04:35,916 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:04:35,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:04:35,924 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:04:35,925 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2070530417] [2020-08-21 15:04:35,925 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:04:35,925 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-21 15:04:35,926 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [157025573] [2020-08-21 15:04:35,926 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-21 15:04:35,926 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:04:35,926 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-21 15:04:35,927 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=553, Unknown=0, NotChecked=0, Total=600 [2020-08-21 15:04:35,927 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 25 states. [2020-08-21 15:04:51,089 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:04:51,090 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2020-08-21 15:04:51,090 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-21 15:04:51,090 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 43 [2020-08-21 15:04:51,091 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:04:51,091 INFO L225 Difference]: With dead ends: 53 [2020-08-21 15:04:51,091 INFO L226 Difference]: Without dead ends: 47 [2020-08-21 15:04:51,092 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 9.1s TimeCoverageRelationStatistics Valid=61, Invalid=691, Unknown=4, NotChecked=0, Total=756 [2020-08-21 15:04:51,093 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-21 15:04:51,096 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-08-21 15:04:51,096 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-21 15:04:51,097 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2020-08-21 15:04:51,097 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 43 [2020-08-21 15:04:51,097 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:04:51,098 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2020-08-21 15:04:51,098 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-21 15:04:51,098 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2020-08-21 15:04:51,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-21 15:04:51,102 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:04:51,103 INFO L422 BasicCegarLoop]: trace histogram [12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:04:51,103 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-21 15:04:51,103 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:04:51,103 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:04:51,103 INFO L82 PathProgramCache]: Analyzing trace with hash -1188694230, now seen corresponding path program 11 times [2020-08-21 15:04:51,104 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:04:51,104 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1851361855] [2020-08-21 15:04:51,104 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:04:51,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat