/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=WIDEST --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/ldv-regression/test25-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 22:11:47,345 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-08-21 22:11:47,388 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 22:11:47,397 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 22:11:47,400 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 22:11:47,403 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 22:11:47,406 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 22:11:47,409 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 22:11:47,410 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 22:11:47,411 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 22:11:47,411 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 22:11:47,414 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 22:11:47,416 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 22:11:47,417 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 22:11:47,419 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 22:11:47,421 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 22:11:47,422 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 22:11:47,430 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 22:11:47,432 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 22:11:47,433 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 22:11:47,434 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 22:11:47,435 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 22:11:47,450 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-21 22:11:47,465 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 22:11:47,465 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 22:11:47,466 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 22:11:47,467 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 22:11:47,495 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 22:11:47,495 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 22:11:47,497 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 22:11:47,497 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 22:11:47,497 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 22:11:47,497 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 22:11:47,498 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 22:11:47,498 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 22:11:47,498 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 22:11:47,498 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 22:11:47,498 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 22:11:47,499 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 22:11:47,499 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 22:11:47,499 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 22:11:47,499 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 22:11:47,499 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 22:11:47,499 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 22:11:47,500 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 22:11:47,500 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 22:11:47,500 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 22:11:47,500 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 22:11:47,501 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 22:11:47,501 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 22:11:47,501 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 22:11:47,501 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 22:11:47,501 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 22:11:47,502 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 22:11:47,502 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 22:11:47,502 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 22:11:47,502 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=WIDEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=WIDEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=WIDEST;log-additional-information=true; [2020-08-21 22:11:47,821 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 22:11:47,840 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 22:11:47,846 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 22:11:47,848 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 22:11:47,848 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 22:11:47,849 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-regression/test25-2.c [2020-08-21 22:11:47,919 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/c2ace781a/14755fa21bb1496895549f2c30f590c0/FLAG02ad4ecb6 [2020-08-21 22:11:48,318 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 22:11:48,319 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/ldv-regression/test25-2.c [2020-08-21 22:11:48,325 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/c2ace781a/14755fa21bb1496895549f2c30f590c0/FLAG02ad4ecb6 [2020-08-21 22:11:48,698 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/c2ace781a/14755fa21bb1496895549f2c30f590c0 [2020-08-21 22:11:48,708 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 22:11:48,710 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 22:11:48,710 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 22:11:48,711 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 22:11:48,714 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 22:11:48,715 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 10:11:48" (1/1) ... [2020-08-21 22:11:48,718 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@118e5697 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 10:11:48, skipping insertion in model container [2020-08-21 22:11:48,718 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 10:11:48" (1/1) ... [2020-08-21 22:11:48,725 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 22:11:48,746 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 22:11:48,976 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 22:11:48,987 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 22:11:49,009 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 22:11:49,150 INFO L208 MainTranslator]: Completed translation [2020-08-21 22:11:49,152 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 10:11:49 WrapperNode [2020-08-21 22:11:49,152 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 22:11:49,153 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 22:11:49,153 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 22:11:49,153 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 22:11:49,168 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 10:11:49" (1/1) ... [2020-08-21 22:11:49,170 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 10:11:49" (1/1) ... [2020-08-21 22:11:49,184 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 10:11:49" (1/1) ... [2020-08-21 22:11:49,184 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 10:11:49" (1/1) ... [2020-08-21 22:11:49,203 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 10:11:49" (1/1) ... [2020-08-21 22:11:49,214 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 10:11:49" (1/1) ... [2020-08-21 22:11:49,216 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 10:11:49" (1/1) ... [2020-08-21 22:11:49,219 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 22:11:49,219 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 22:11:49,220 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 22:11:49,220 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 22:11:49,221 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 10:11:49" (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 22:11:49,284 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 22:11:49,285 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 22:11:49,286 INFO L138 BoogieDeclarations]: Found implementation of procedure check [2020-08-21 22:11:49,286 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 22:11:49,287 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 22:11:49,288 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-21 22:11:49,288 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-08-21 22:11:49,288 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-08-21 22:11:49,288 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-21 22:11:49,289 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 22:11:49,289 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-21 22:11:49,289 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-21 22:11:49,290 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-08-21 22:11:49,290 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-21 22:11:49,290 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 22:11:49,291 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 22:11:49,577 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 22:11:49,577 INFO L295 CfgBuilder]: Removed 2 assume(true) statements. [2020-08-21 22:11:49,581 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 10:11:49 BoogieIcfgContainer [2020-08-21 22:11:49,581 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 22:11:49,582 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 22:11:49,582 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 22:11:49,587 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 22:11:49,587 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 10:11:48" (1/3) ... [2020-08-21 22:11:49,588 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@18a56e3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 10:11:49, skipping insertion in model container [2020-08-21 22:11:49,589 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 10:11:49" (2/3) ... [2020-08-21 22:11:49,589 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@18a56e3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 10:11:49, skipping insertion in model container [2020-08-21 22:11:49,589 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 10:11:49" (3/3) ... [2020-08-21 22:11:49,591 INFO L109 eAbstractionObserver]: Analyzing ICFG test25-2.c [2020-08-21 22:11:49,605 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 22:11:49,614 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 22:11:49,633 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 22:11:49,660 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 22:11:49,661 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 22:11:49,661 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 22:11:49,661 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 22:11:49,661 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 22:11:49,661 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 22:11:49,661 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 22:11:49,662 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 22:11:49,684 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states. [2020-08-21 22:11:49,693 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-21 22:11:49,693 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:11:49,694 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:11:49,694 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:11:49,715 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:11:49,715 INFO L82 PathProgramCache]: Analyzing trace with hash -899836778, now seen corresponding path program 1 times [2020-08-21 22:11:49,736 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:11:49,737 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [453958104] [2020-08-21 22:11:49,741 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:11:49,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:11:49,929 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:11:49,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:11:49,939 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-21 22:11:49,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:11:49,955 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 22:11:49,956 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [453958104] [2020-08-21 22:11:49,958 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 22:11:49,958 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 22:11:49,959 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1520271387] [2020-08-21 22:11:49,964 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 22:11:49,965 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:11:49,975 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 22:11:49,976 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 22:11:49,978 INFO L87 Difference]: Start difference. First operand 25 states. Second operand 3 states. [2020-08-21 22:11:50,082 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:11:50,082 INFO L93 Difference]: Finished difference Result 42 states and 52 transitions. [2020-08-21 22:11:50,083 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 22:11:50,085 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-08-21 22:11:50,085 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:11:50,096 INFO L225 Difference]: With dead ends: 42 [2020-08-21 22:11:50,096 INFO L226 Difference]: Without dead ends: 20 [2020-08-21 22:11:50,100 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 5 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 22:11:50,121 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-21 22:11:50,139 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-21 22:11:50,141 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-21 22:11:50,142 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2020-08-21 22:11:50,144 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 17 [2020-08-21 22:11:50,144 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:11:50,145 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2020-08-21 22:11:50,145 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 22:11:50,145 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2020-08-21 22:11:50,146 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-21 22:11:50,146 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:11:50,147 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:11:50,147 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 22:11:50,147 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:11:50,148 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:11:50,148 INFO L82 PathProgramCache]: Analyzing trace with hash -1137678901, now seen corresponding path program 1 times [2020-08-21 22:11:50,149 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:11:50,149 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [777394830] [2020-08-21 22:11:50,149 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:11:50,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:11:50,237 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:11:50,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:11:50,245 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-08-21 22:11:50,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:11:50,257 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 22:11:50,257 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [777394830] [2020-08-21 22:11:50,258 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 22:11:50,258 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 22:11:50,258 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [615064271] [2020-08-21 22:11:50,260 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 22:11:50,260 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:11:50,261 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 22:11:50,261 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 22:11:50,261 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 4 states. [2020-08-21 22:11:50,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:11:50,337 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2020-08-21 22:11:50,340 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 22:11:50,341 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 18 [2020-08-21 22:11:50,341 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:11:50,342 INFO L225 Difference]: With dead ends: 34 [2020-08-21 22:11:50,342 INFO L226 Difference]: Without dead ends: 22 [2020-08-21 22:11:50,344 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 22:11:50,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-21 22:11:50,356 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2020-08-21 22:11:50,357 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-21 22:11:50,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-08-21 22:11:50,359 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 18 [2020-08-21 22:11:50,360 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:11:50,360 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-08-21 22:11:50,360 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 22:11:50,361 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-08-21 22:11:50,363 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-21 22:11:50,363 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:11:50,363 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:11:50,364 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 22:11:50,364 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:11:50,365 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:11:50,366 INFO L82 PathProgramCache]: Analyzing trace with hash 278779309, now seen corresponding path program 1 times [2020-08-21 22:11:50,368 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:11:50,369 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [347384717] [2020-08-21 22:11:50,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:11:50,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:11:50,479 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:11:50,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:11:50,484 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2020-08-21 22:11:50,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:11:50,493 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:11:50,494 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [347384717] [2020-08-21 22:11:50,494 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:11:50,494 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-21 22:11:50,495 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [126219180] [2020-08-21 22:11:50,495 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 22:11:50,495 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:11:50,496 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 22:11:50,496 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-21 22:11:50,496 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 5 states. [2020-08-21 22:11:50,570 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:11:50,570 INFO L93 Difference]: Finished difference Result 36 states and 38 transitions. [2020-08-21 22:11:50,571 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 22:11:50,571 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 20 [2020-08-21 22:11:50,571 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:11:50,572 INFO L225 Difference]: With dead ends: 36 [2020-08-21 22:11:50,572 INFO L226 Difference]: Without dead ends: 24 [2020-08-21 22:11:50,573 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-21 22:11:50,574 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-21 22:11:50,578 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2020-08-21 22:11:50,578 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-21 22:11:50,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2020-08-21 22:11:50,580 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 20 [2020-08-21 22:11:50,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:11:50,580 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2020-08-21 22:11:50,580 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 22:11:50,581 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2020-08-21 22:11:50,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-21 22:11:50,582 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:11:50,582 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:11:50,582 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 22:11:50,583 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:11:50,583 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:11:50,583 INFO L82 PathProgramCache]: Analyzing trace with hash -9513713, now seen corresponding path program 2 times [2020-08-21 22:11:50,583 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:11:50,584 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1101738369] [2020-08-21 22:11:50,584 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:11:50,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:11:50,720 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:11:50,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:11:50,725 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2020-08-21 22:11:50,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:11:50,732 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:11:50,732 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1101738369] [2020-08-21 22:11:50,733 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:11:50,733 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 22:11:50,733 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1049777042] [2020-08-21 22:11:50,736 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 22:11:50,736 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:11:50,737 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 22:11:50,737 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-21 22:11:50,737 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand 6 states. [2020-08-21 22:11:50,861 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:11:50,862 INFO L93 Difference]: Finished difference Result 38 states and 40 transitions. [2020-08-21 22:11:50,863 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 22:11:50,863 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 22 [2020-08-21 22:11:50,864 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:11:50,864 INFO L225 Difference]: With dead ends: 38 [2020-08-21 22:11:50,880 INFO L226 Difference]: Without dead ends: 26 [2020-08-21 22:11:50,880 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-21 22:11:50,881 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-21 22:11:50,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2020-08-21 22:11:50,889 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-21 22:11:50,890 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2020-08-21 22:11:50,891 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 22 [2020-08-21 22:11:50,891 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:11:50,891 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2020-08-21 22:11:50,891 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 22:11:50,891 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2020-08-21 22:11:50,892 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-21 22:11:50,892 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:11:50,892 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:11:50,893 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 22:11:50,894 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:11:50,894 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:11:50,894 INFO L82 PathProgramCache]: Analyzing trace with hash 2113766385, now seen corresponding path program 3 times [2020-08-21 22:11:50,895 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:11:50,895 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [344958700] [2020-08-21 22:11:50,895 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:11:50,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:11:51,004 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:11:51,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:11:51,008 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2020-08-21 22:11:51,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:11:51,014 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:11:51,014 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [344958700] [2020-08-21 22:11:51,014 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:11:51,015 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 22:11:51,015 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1125646770] [2020-08-21 22:11:51,015 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 22:11:51,016 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:11:51,016 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 22:11:51,016 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-21 22:11:51,016 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand 7 states. [2020-08-21 22:11:51,083 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:11:51,084 INFO L93 Difference]: Finished difference Result 40 states and 42 transitions. [2020-08-21 22:11:51,084 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 22:11:51,084 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 24 [2020-08-21 22:11:51,085 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:11:51,085 INFO L225 Difference]: With dead ends: 40 [2020-08-21 22:11:51,085 INFO L226 Difference]: Without dead ends: 28 [2020-08-21 22:11:51,086 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-21 22:11:51,087 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-21 22:11:51,090 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2020-08-21 22:11:51,091 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-21 22:11:51,092 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2020-08-21 22:11:51,092 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 24 [2020-08-21 22:11:51,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:11:51,092 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2020-08-21 22:11:51,092 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 22:11:51,093 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2020-08-21 22:11:51,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-21 22:11:51,094 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:11:51,094 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:11:51,094 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 22:11:51,094 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:11:51,095 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:11:51,095 INFO L82 PathProgramCache]: Analyzing trace with hash -1818492333, now seen corresponding path program 4 times [2020-08-21 22:11:51,095 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:11:51,095 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1061954736] [2020-08-21 22:11:51,095 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:11:51,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:11:51,192 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:11:51,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:11:51,198 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2020-08-21 22:11:51,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:11:51,206 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:11:51,207 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1061954736] [2020-08-21 22:11:51,208 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:11:51,208 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 22:11:51,208 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1688334591] [2020-08-21 22:11:51,210 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 22:11:51,210 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:11:51,211 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 22:11:51,211 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-08-21 22:11:51,211 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 8 states. [2020-08-21 22:11:51,300 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:11:51,301 INFO L93 Difference]: Finished difference Result 42 states and 44 transitions. [2020-08-21 22:11:51,301 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 22:11:51,301 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 26 [2020-08-21 22:11:51,302 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:11:51,302 INFO L225 Difference]: With dead ends: 42 [2020-08-21 22:11:51,303 INFO L226 Difference]: Without dead ends: 30 [2020-08-21 22:11:51,303 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-08-21 22:11:51,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-21 22:11:51,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-08-21 22:11:51,308 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-21 22:11:51,309 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2020-08-21 22:11:51,309 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 26 [2020-08-21 22:11:51,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:11:51,309 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2020-08-21 22:11:51,309 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 22:11:51,310 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2020-08-21 22:11:51,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-21 22:11:51,310 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:11:51,311 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:11:51,311 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 22:11:51,311 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:11:51,311 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:11:51,312 INFO L82 PathProgramCache]: Analyzing trace with hash -1147899851, now seen corresponding path program 5 times [2020-08-21 22:11:51,312 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:11:51,312 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1624511339] [2020-08-21 22:11:51,312 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:11:51,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:11:51,401 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:11:51,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:11:51,405 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2020-08-21 22:11:51,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:11:51,413 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:11:51,414 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1624511339] [2020-08-21 22:11:51,414 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:11:51,414 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 22:11:51,414 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1725807283] [2020-08-21 22:11:51,416 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 22:11:51,416 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:11:51,416 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 22:11:51,418 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-08-21 22:11:51,418 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand 9 states. [2020-08-21 22:11:51,523 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:11:51,524 INFO L93 Difference]: Finished difference Result 44 states and 46 transitions. [2020-08-21 22:11:51,524 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 22:11:51,524 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 28 [2020-08-21 22:11:51,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:11:51,525 INFO L225 Difference]: With dead ends: 44 [2020-08-21 22:11:51,525 INFO L226 Difference]: Without dead ends: 32 [2020-08-21 22:11:51,526 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-08-21 22:11:51,526 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-21 22:11:51,530 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-08-21 22:11:51,530 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-21 22:11:51,531 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2020-08-21 22:11:51,531 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 28 [2020-08-21 22:11:51,532 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:11:51,532 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2020-08-21 22:11:51,532 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 22:11:51,532 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2020-08-21 22:11:51,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-21 22:11:51,533 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:11:51,533 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:11:51,533 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 22:11:51,534 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:11:51,534 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:11:51,534 INFO L82 PathProgramCache]: Analyzing trace with hash -953619049, now seen corresponding path program 6 times [2020-08-21 22:11:51,534 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:11:51,535 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1960259983] [2020-08-21 22:11:51,535 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:11:51,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:11:51,645 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:11:51,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:11:51,648 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-08-21 22:11:51,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:11:51,653 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:11:51,653 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1960259983] [2020-08-21 22:11:51,654 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:11:51,654 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 22:11:51,654 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2128230764] [2020-08-21 22:11:51,655 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 22:11:51,655 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:11:51,655 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 22:11:51,655 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-08-21 22:11:51,656 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand 10 states. [2020-08-21 22:11:51,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:11:51,735 INFO L93 Difference]: Finished difference Result 46 states and 48 transitions. [2020-08-21 22:11:51,735 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 22:11:51,736 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 30 [2020-08-21 22:11:51,736 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:11:51,736 INFO L225 Difference]: With dead ends: 46 [2020-08-21 22:11:51,737 INFO L226 Difference]: Without dead ends: 34 [2020-08-21 22:11:51,737 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-08-21 22:11:51,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-21 22:11:51,742 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-08-21 22:11:51,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-21 22:11:51,743 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2020-08-21 22:11:51,743 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 30 [2020-08-21 22:11:51,744 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:11:51,744 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2020-08-21 22:11:51,744 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 22:11:51,744 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2020-08-21 22:11:51,745 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-21 22:11:51,745 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:11:51,745 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:11:51,745 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 22:11:51,745 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:11:51,746 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:11:51,746 INFO L82 PathProgramCache]: Analyzing trace with hash 1066637945, now seen corresponding path program 7 times [2020-08-21 22:11:51,746 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:11:51,747 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1993661680] [2020-08-21 22:11:51,747 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:11:51,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:11:51,854 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:11:51,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:11:51,858 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2020-08-21 22:11:51,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:11:51,863 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:11:51,864 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1993661680] [2020-08-21 22:11:51,864 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:11:51,864 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 22:11:51,865 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1358729639] [2020-08-21 22:11:51,865 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 22:11:51,865 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:11:51,866 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 22:11:51,866 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-08-21 22:11:51,866 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 11 states. [2020-08-21 22:11:51,978 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:11:51,978 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2020-08-21 22:11:51,978 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 22:11:51,978 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 32 [2020-08-21 22:11:51,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:11:51,979 INFO L225 Difference]: With dead ends: 48 [2020-08-21 22:11:51,979 INFO L226 Difference]: Without dead ends: 36 [2020-08-21 22:11:51,980 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-08-21 22:11:51,980 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-21 22:11:51,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-08-21 22:11:51,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-21 22:11:51,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2020-08-21 22:11:51,985 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 32 [2020-08-21 22:11:51,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:11:51,985 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2020-08-21 22:11:51,986 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 22:11:51,986 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2020-08-21 22:11:51,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-21 22:11:51,986 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:11:51,987 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:11:51,987 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 22:11:51,987 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:11:51,987 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:11:51,987 INFO L82 PathProgramCache]: Analyzing trace with hash 1208391387, now seen corresponding path program 8 times [2020-08-21 22:11:51,987 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:11:51,988 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1269291633] [2020-08-21 22:11:51,988 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:11:52,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:11:52,110 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:11:52,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:11:52,113 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2020-08-21 22:11:52,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:11:52,118 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:11:52,119 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1269291633] [2020-08-21 22:11:52,119 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:11:52,119 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 22:11:52,120 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [434759913] [2020-08-21 22:11:52,120 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 22:11:52,120 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:11:52,121 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 22:11:52,121 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-08-21 22:11:52,121 INFO L87 Difference]: Start difference. First operand 35 states and 36 transitions. Second operand 12 states. [2020-08-21 22:11:52,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:11:52,226 INFO L93 Difference]: Finished difference Result 50 states and 52 transitions. [2020-08-21 22:11:52,227 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 22:11:52,227 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 34 [2020-08-21 22:11:52,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:11:52,228 INFO L225 Difference]: With dead ends: 50 [2020-08-21 22:11:52,228 INFO L226 Difference]: Without dead ends: 38 [2020-08-21 22:11:52,229 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-08-21 22:11:52,229 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-21 22:11:52,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-08-21 22:11:52,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-21 22:11:52,234 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 38 transitions. [2020-08-21 22:11:52,234 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 38 transitions. Word has length 34 [2020-08-21 22:11:52,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:11:52,235 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 38 transitions. [2020-08-21 22:11:52,235 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 22:11:52,235 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 38 transitions. [2020-08-21 22:11:52,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-21 22:11:52,236 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:11:52,236 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:11:52,236 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 22:11:52,236 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:11:52,236 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:11:52,237 INFO L82 PathProgramCache]: Analyzing trace with hash -5504323, now seen corresponding path program 9 times [2020-08-21 22:11:52,237 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:11:52,237 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1319220058] [2020-08-21 22:11:52,237 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:11:52,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:11:52,392 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:11:52,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:11:52,396 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2020-08-21 22:11:52,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:11:52,405 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:11:52,406 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1319220058] [2020-08-21 22:11:52,406 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:11:52,406 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 22:11:52,407 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2112730800] [2020-08-21 22:11:52,408 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 22:11:52,409 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:11:52,409 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 22:11:52,409 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-08-21 22:11:52,410 INFO L87 Difference]: Start difference. First operand 37 states and 38 transitions. Second operand 13 states. [2020-08-21 22:11:52,519 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:11:52,519 INFO L93 Difference]: Finished difference Result 51 states and 53 transitions. [2020-08-21 22:11:52,519 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 22:11:52,519 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 36 [2020-08-21 22:11:52,520 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:11:52,520 INFO L225 Difference]: With dead ends: 51 [2020-08-21 22:11:52,520 INFO L226 Difference]: Without dead ends: 39 [2020-08-21 22:11:52,521 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-08-21 22:11:52,522 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-21 22:11:52,525 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-21 22:11:52,526 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-21 22:11:52,526 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2020-08-21 22:11:52,527 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 36 [2020-08-21 22:11:52,527 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:11:52,527 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2020-08-21 22:11:52,527 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 22:11:52,527 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2020-08-21 22:11:52,528 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-21 22:11:52,528 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:11:52,528 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:11:52,529 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 22:11:52,529 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:11:52,529 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:11:52,529 INFO L82 PathProgramCache]: Analyzing trace with hash 1671822879, now seen corresponding path program 10 times [2020-08-21 22:11:52,530 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:11:52,530 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1266969300] [2020-08-21 22:11:52,530 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:11:52,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:12:03,011 WARN L193 SmtUtils]: Spent 187.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 8 [2020-08-21 22:12:04,097 WARN L193 SmtUtils]: Spent 859.00 ms on a formula simplification. DAG size of input: 567 DAG size of output: 11 [2020-08-21 22:12:08,221 WARN L193 SmtUtils]: Spent 3.76 s on a formula simplification. DAG size of input: 1063 DAG size of output: 8 [2020-08-21 22:12:36,407 WARN L193 SmtUtils]: Spent 27.34 s on a formula simplification. DAG size of input: 2458 DAG size of output: 8 [2020-08-21 22:12:36,731 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 31 [2020-08-21 22:12:36,815 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:12:36,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:12:36,819 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2020-08-21 22:12:36,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:12:36,828 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 99 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-21 22:12:36,828 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1266969300] [2020-08-21 22:12:36,829 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:12:36,829 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-21 22:12:36,829 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [236059646] [2020-08-21 22:12:36,830 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-21 22:12:36,830 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:12:36,830 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-21 22:12:36,831 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=201, Unknown=0, NotChecked=0, Total=240 [2020-08-21 22:12:36,831 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 16 states. [2020-08-21 22:12:37,271 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:12:37,271 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2020-08-21 22:12:37,271 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-21 22:12:37,272 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 38 [2020-08-21 22:12:37,272 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:12:37,272 INFO L225 Difference]: With dead ends: 49 [2020-08-21 22:12:37,272 INFO L226 Difference]: Without dead ends: 41 [2020-08-21 22:12:37,273 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 33.6s TimeCoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2020-08-21 22:12:37,273 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-21 22:12:37,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-21 22:12:37,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-21 22:12:37,283 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 42 transitions. [2020-08-21 22:12:37,283 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 42 transitions. Word has length 38 [2020-08-21 22:12:37,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:12:37,283 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 42 transitions. [2020-08-21 22:12:37,284 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-21 22:12:37,285 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 42 transitions. [2020-08-21 22:12:37,286 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-21 22:12:37,286 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:12:37,286 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:12:37,286 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 22:12:37,286 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:12:37,288 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:12:37,288 INFO L82 PathProgramCache]: Analyzing trace with hash 443458522, now seen corresponding path program 1 times [2020-08-21 22:12:37,288 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:12:37,289 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [171741388] [2020-08-21 22:12:37,289 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:12:37,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:12:41,553 WARN L193 SmtUtils]: Spent 301.00 ms on a formula simplification. DAG size of input: 180 DAG size of output: 8 [2020-08-21 22:12:42,694 WARN L193 SmtUtils]: Spent 841.00 ms on a formula simplification. DAG size of input: 401 DAG size of output: 8 [2020-08-21 22:12:46,777 WARN L193 SmtUtils]: Spent 3.73 s on a formula simplification. DAG size of input: 830 DAG size of output: 8 [2020-08-21 22:12:46,985 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 69 DAG size of output: 45 [2020-08-21 22:12:47,296 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:12:47,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:12:47,308 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2020-08-21 22:12:47,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:12:47,367 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 0 proven. 101 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-21 22:12:47,367 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [171741388] [2020-08-21 22:12:47,368 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:12:47,368 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-21 22:12:47,368 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [506024452] [2020-08-21 22:12:47,368 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-21 22:12:47,369 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:12:47,369 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-21 22:12:47,369 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=370, Unknown=0, NotChecked=0, Total=420 [2020-08-21 22:12:47,370 INFO L87 Difference]: Start difference. First operand 41 states and 42 transitions. Second operand 21 states. [2020-08-21 22:12:48,402 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:12:48,403 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2020-08-21 22:12:48,403 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-21 22:12:48,404 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 40 [2020-08-21 22:12:48,404 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:12:48,406 INFO L225 Difference]: With dead ends: 48 [2020-08-21 22:12:48,406 INFO L226 Difference]: Without dead ends: 43 [2020-08-21 22:12:48,407 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=94, Invalid=718, Unknown=0, NotChecked=0, Total=812 [2020-08-21 22:12:48,407 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-21 22:12:48,420 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-21 22:12:48,420 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-21 22:12:48,421 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2020-08-21 22:12:48,421 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 40 [2020-08-21 22:12:48,422 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:12:48,425 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2020-08-21 22:12:48,425 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-21 22:12:48,426 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2020-08-21 22:12:48,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-21 22:12:48,426 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:12:48,426 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:12:48,430 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 22:12:48,430 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:12:48,430 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:12:48,430 INFO L82 PathProgramCache]: Analyzing trace with hash 1101317845, now seen corresponding path program 2 times [2020-08-21 22:12:48,431 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:12:48,431 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1279916849] [2020-08-21 22:12:48,431 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:12:48,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat