/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=SMALLESTAMONGWIDE --traceabstraction.additional.smt.options tolerance=0.5 --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/cggmp2005b.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-22 06:24:51,340 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-22 06:24:51,344 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-22 06:24:51,385 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-22 06:24:51,386 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-22 06:24:51,395 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-22 06:24:51,397 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-22 06:24:51,400 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-22 06:24:51,404 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-22 06:24:51,407 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-22 06:24:51,407 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-22 06:24:51,409 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-22 06:24:51,409 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-22 06:24:51,412 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-22 06:24:51,414 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-22 06:24:51,416 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-22 06:24:51,417 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-22 06:24:51,418 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-22 06:24:51,419 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-22 06:24:51,428 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-22 06:24:51,430 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-22 06:24:51,432 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-22 06:24:51,433 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-22 06:24:51,434 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-22 06:24:51,450 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-22 06:24:51,465 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-22 06:24:51,466 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-22 06:24:51,467 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-22 06:24:51,468 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 [2020-08-22 06:24:51,507 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-22 06:24:51,507 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-22 06:24:51,509 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-22 06:24:51,510 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-22 06:24:51,510 INFO L138 SettingsManager]: * Use SBE=true [2020-08-22 06:24:51,510 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-22 06:24:51,510 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-22 06:24:51,511 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-22 06:24:51,511 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-22 06:24:51,511 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-22 06:24:51,512 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-22 06:24:51,512 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-22 06:24:51,513 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-22 06:24:51,513 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-22 06:24:51,513 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-22 06:24:51,513 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-22 06:24:51,514 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-22 06:24:51,514 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-22 06:24:51,514 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-22 06:24:51,514 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-22 06:24:51,515 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-22 06:24:51,515 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-22 06:24:51,515 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-22 06:24:51,515 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-22 06:24:51,515 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-22 06:24:51,516 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-22 06:24:51,516 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-22 06:24:51,516 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-22 06:24:51,516 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-22 06:24:51,516 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=SMALLESTAMONGWIDE;tolerance=0.5;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.5;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.5;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.5;log-additional-information=true; [2020-08-22 06:24:51,840 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-22 06:24:51,853 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-22 06:24:51,856 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-22 06:24:51,858 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-22 06:24:51,858 INFO L275 PluginConnector]: CDTParser initialized [2020-08-22 06:24:51,859 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/cggmp2005b.i [2020-08-22 06:24:51,927 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/7e03bd578/16addcceb04f496499f4772370155bbf/FLAGd57bca94a [2020-08-22 06:24:52,360 INFO L306 CDTParser]: Found 1 translation units. [2020-08-22 06:24:52,360 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-lit/cggmp2005b.i [2020-08-22 06:24:52,367 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/7e03bd578/16addcceb04f496499f4772370155bbf/FLAGd57bca94a [2020-08-22 06:24:52,711 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/7e03bd578/16addcceb04f496499f4772370155bbf [2020-08-22 06:24:52,722 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-22 06:24:52,724 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-22 06:24:52,728 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-22 06:24:52,728 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-22 06:24:52,731 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-22 06:24:52,732 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 06:24:52" (1/1) ... [2020-08-22 06:24:52,736 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@73ff463a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:24:52, skipping insertion in model container [2020-08-22 06:24:52,737 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 06:24:52" (1/1) ... [2020-08-22 06:24:52,745 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-22 06:24:52,765 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-22 06:24:52,961 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 06:24:52,967 INFO L203 MainTranslator]: Completed pre-run [2020-08-22 06:24:52,981 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 06:24:52,994 INFO L208 MainTranslator]: Completed translation [2020-08-22 06:24:52,994 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:24:52 WrapperNode [2020-08-22 06:24:52,994 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-22 06:24:52,995 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-22 06:24:52,995 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-22 06:24:52,995 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-22 06:24:53,007 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:24:52" (1/1) ... [2020-08-22 06:24:53,007 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:24:52" (1/1) ... [2020-08-22 06:24:53,090 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:24:52" (1/1) ... [2020-08-22 06:24:53,090 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:24:52" (1/1) ... [2020-08-22 06:24:53,095 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:24:52" (1/1) ... [2020-08-22 06:24:53,100 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:24:52" (1/1) ... [2020-08-22 06:24:53,101 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:24:52" (1/1) ... [2020-08-22 06:24:53,103 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-22 06:24:53,104 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-22 06:24:53,104 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-22 06:24:53,104 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-22 06:24:53,105 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:24:52" (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 [2020-08-22 06:24:53,164 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-22 06:24:53,165 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-22 06:24:53,165 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-22 06:24:53,165 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-22 06:24:53,165 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-22 06:24:53,165 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-22 06:24:53,165 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-22 06:24:53,166 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-22 06:24:53,167 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-22 06:24:53,168 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-22 06:24:53,168 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-22 06:24:53,168 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-22 06:24:53,169 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-22 06:24:53,360 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-22 06:24:53,360 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-22 06:24:53,364 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 06:24:53 BoogieIcfgContainer [2020-08-22 06:24:53,365 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-22 06:24:53,366 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-22 06:24:53,366 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-22 06:24:53,369 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-22 06:24:53,370 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.08 06:24:52" (1/3) ... [2020-08-22 06:24:53,370 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1118290e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 06:24:53, skipping insertion in model container [2020-08-22 06:24:53,371 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:24:52" (2/3) ... [2020-08-22 06:24:53,371 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1118290e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 06:24:53, skipping insertion in model container [2020-08-22 06:24:53,371 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 06:24:53" (3/3) ... [2020-08-22 06:24:53,373 INFO L109 eAbstractionObserver]: Analyzing ICFG cggmp2005b.i [2020-08-22 06:24:53,388 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-22 06:24:53,396 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-22 06:24:53,417 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-22 06:24:53,449 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-22 06:24:53,449 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-22 06:24:53,449 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-22 06:24:53,449 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-22 06:24:53,450 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-22 06:24:53,450 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-22 06:24:53,450 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-22 06:24:53,450 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-22 06:24:53,473 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2020-08-22 06:24:53,482 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-22 06:24:53,483 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:24:53,483 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:24:53,486 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:24:53,495 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:24:53,496 INFO L82 PathProgramCache]: Analyzing trace with hash -1039733575, now seen corresponding path program 1 times [2020-08-22 06:24:53,507 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:24:53,508 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [879504453] [2020-08-22 06:24:53,508 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:24:53,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:53,626 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:24:53,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:53,633 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 06:24:53,634 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [879504453] [2020-08-22 06:24:53,636 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 06:24:53,636 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-08-22 06:24:53,637 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [750579675] [2020-08-22 06:24:53,642 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-08-22 06:24:53,643 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:24:53,654 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-08-22 06:24:53,654 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-22 06:24:53,656 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 2 states. [2020-08-22 06:24:53,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:24:53,677 INFO L93 Difference]: Finished difference Result 37 states and 50 transitions. [2020-08-22 06:24:53,678 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-08-22 06:24:53,679 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2020-08-22 06:24:53,679 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:24:53,686 INFO L225 Difference]: With dead ends: 37 [2020-08-22 06:24:53,686 INFO L226 Difference]: Without dead ends: 14 [2020-08-22 06:24:53,689 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 [2020-08-22 06:24:53,706 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-08-22 06:24:53,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-08-22 06:24:53,724 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-08-22 06:24:53,725 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2020-08-22 06:24:53,726 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 10 [2020-08-22 06:24:53,726 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:24:53,727 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2020-08-22 06:24:53,727 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-08-22 06:24:53,727 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2020-08-22 06:24:53,728 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-22 06:24:53,728 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:24:53,728 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:24:53,728 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-22 06:24:53,729 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:24:53,729 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:24:53,729 INFO L82 PathProgramCache]: Analyzing trace with hash -1066515684, now seen corresponding path program 1 times [2020-08-22 06:24:53,729 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:24:53,730 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [61043895] [2020-08-22 06:24:53,730 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:24:53,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:53,772 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:24:53,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:53,776 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 06:24:53,777 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [61043895] [2020-08-22 06:24:53,777 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 06:24:53,777 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-22 06:24:53,778 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1114330289] [2020-08-22 06:24:53,780 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-22 06:24:53,780 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:24:53,781 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-22 06:24:53,781 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-22 06:24:53,782 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand 3 states. [2020-08-22 06:24:53,810 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:24:53,810 INFO L93 Difference]: Finished difference Result 20 states and 22 transitions. [2020-08-22 06:24:53,811 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-22 06:24:53,812 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-08-22 06:24:53,812 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:24:53,813 INFO L225 Difference]: With dead ends: 20 [2020-08-22 06:24:53,813 INFO L226 Difference]: Without dead ends: 15 [2020-08-22 06:24:53,814 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 [2020-08-22 06:24:53,815 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-22 06:24:53,822 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-22 06:24:53,822 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-22 06:24:53,823 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-08-22 06:24:53,823 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 10 [2020-08-22 06:24:53,823 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:24:53,824 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-08-22 06:24:53,824 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-22 06:24:53,824 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-08-22 06:24:53,825 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-22 06:24:53,825 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:24:53,825 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:24:53,825 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-22 06:24:53,826 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:24:53,826 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:24:53,826 INFO L82 PathProgramCache]: Analyzing trace with hash 1875131310, now seen corresponding path program 1 times [2020-08-22 06:24:53,826 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:24:53,827 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [743940489] [2020-08-22 06:24:53,827 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:24:53,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:53,862 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:24:53,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:53,867 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 06:24:53,868 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [743940489] [2020-08-22 06:24:53,868 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 06:24:53,868 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-22 06:24:53,869 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1749449591] [2020-08-22 06:24:53,869 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-22 06:24:53,869 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:24:53,870 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-22 06:24:53,870 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-22 06:24:53,870 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 3 states. [2020-08-22 06:24:53,881 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:24:53,882 INFO L93 Difference]: Finished difference Result 25 states and 30 transitions. [2020-08-22 06:24:53,882 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-22 06:24:53,883 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 14 [2020-08-22 06:24:53,883 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:24:53,884 INFO L225 Difference]: With dead ends: 25 [2020-08-22 06:24:53,884 INFO L226 Difference]: Without dead ends: 16 [2020-08-22 06:24:53,885 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 [2020-08-22 06:24:53,885 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-22 06:24:53,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-22 06:24:53,889 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-22 06:24:53,890 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-08-22 06:24:53,890 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 14 [2020-08-22 06:24:53,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:24:53,891 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-08-22 06:24:53,891 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-22 06:24:53,891 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-08-22 06:24:53,892 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-22 06:24:53,892 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:24:53,892 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:24:53,892 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-22 06:24:53,893 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:24:53,893 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:24:53,893 INFO L82 PathProgramCache]: Analyzing trace with hash -224898986, now seen corresponding path program 1 times [2020-08-22 06:24:53,893 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:24:53,894 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1862016038] [2020-08-22 06:24:53,894 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:24:53,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:53,953 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:24:53,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:53,958 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 06:24:53,958 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1862016038] [2020-08-22 06:24:53,958 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:24:53,959 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-22 06:24:53,959 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1076000692] [2020-08-22 06:24:53,959 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-22 06:24:53,960 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:24:53,960 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-22 06:24:53,961 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-22 06:24:53,961 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 5 states. [2020-08-22 06:24:54,034 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:24:54,035 INFO L93 Difference]: Finished difference Result 26 states and 31 transitions. [2020-08-22 06:24:54,035 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-22 06:24:54,036 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 15 [2020-08-22 06:24:54,036 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:24:54,037 INFO L225 Difference]: With dead ends: 26 [2020-08-22 06:24:54,037 INFO L226 Difference]: Without dead ends: 17 [2020-08-22 06:24:54,038 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2020-08-22 06:24:54,038 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-22 06:24:54,043 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-22 06:24:54,043 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-22 06:24:54,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2020-08-22 06:24:54,044 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 15 [2020-08-22 06:24:54,045 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:24:54,045 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2020-08-22 06:24:54,045 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-22 06:24:54,045 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2020-08-22 06:24:54,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-22 06:24:54,046 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:24:54,046 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:24:54,046 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-22 06:24:54,047 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:24:54,047 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:24:54,047 INFO L82 PathProgramCache]: Analyzing trace with hash -901328722, now seen corresponding path program 2 times [2020-08-22 06:24:54,048 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:24:54,048 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [311675116] [2020-08-22 06:24:54,048 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:24:54,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:54,110 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:24:54,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:54,114 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 06:24:54,115 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [311675116] [2020-08-22 06:24:54,115 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:24:54,115 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-22 06:24:54,116 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2066866524] [2020-08-22 06:24:54,116 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-22 06:24:54,116 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:24:54,117 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-22 06:24:54,117 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-22 06:24:54,117 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand 6 states. [2020-08-22 06:24:54,196 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:24:54,196 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-08-22 06:24:54,197 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-22 06:24:54,197 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 16 [2020-08-22 06:24:54,198 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:24:54,198 INFO L225 Difference]: With dead ends: 27 [2020-08-22 06:24:54,198 INFO L226 Difference]: Without dead ends: 18 [2020-08-22 06:24:54,199 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2020-08-22 06:24:54,200 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-22 06:24:54,204 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-08-22 06:24:54,204 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-22 06:24:54,205 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2020-08-22 06:24:54,206 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 16 [2020-08-22 06:24:54,206 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:24:54,206 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2020-08-22 06:24:54,206 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-22 06:24:54,206 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2020-08-22 06:24:54,207 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-22 06:24:54,207 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:24:54,207 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:24:54,208 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-22 06:24:54,208 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:24:54,208 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:24:54,208 INFO L82 PathProgramCache]: Analyzing trace with hash -395814058, now seen corresponding path program 3 times [2020-08-22 06:24:54,208 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:24:54,209 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1027401981] [2020-08-22 06:24:54,209 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:24:54,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:54,301 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:24:54,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:54,305 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 06:24:54,306 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1027401981] [2020-08-22 06:24:54,306 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:24:54,306 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-22 06:24:54,307 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [270908173] [2020-08-22 06:24:54,307 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-22 06:24:54,308 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:24:54,308 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-22 06:24:54,308 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-08-22 06:24:54,309 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 7 states. [2020-08-22 06:24:54,420 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:24:54,420 INFO L93 Difference]: Finished difference Result 28 states and 33 transitions. [2020-08-22 06:24:54,421 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-22 06:24:54,421 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 17 [2020-08-22 06:24:54,422 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:24:54,422 INFO L225 Difference]: With dead ends: 28 [2020-08-22 06:24:54,422 INFO L226 Difference]: Without dead ends: 19 [2020-08-22 06:24:54,423 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2020-08-22 06:24:54,424 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-08-22 06:24:54,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-08-22 06:24:54,429 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-22 06:24:54,430 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2020-08-22 06:24:54,430 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 17 [2020-08-22 06:24:54,431 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:24:54,431 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2020-08-22 06:24:54,431 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-22 06:24:54,431 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2020-08-22 06:24:54,432 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-22 06:24:54,432 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:24:54,432 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:24:54,433 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-22 06:24:54,433 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:24:54,433 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:24:54,434 INFO L82 PathProgramCache]: Analyzing trace with hash -1904728658, now seen corresponding path program 4 times [2020-08-22 06:24:54,434 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:24:54,434 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2031365605] [2020-08-22 06:24:54,434 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:24:54,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:54,529 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:24:54,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:54,532 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 06:24:54,532 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2031365605] [2020-08-22 06:24:54,533 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:24:54,534 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-22 06:24:54,534 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [307634531] [2020-08-22 06:24:54,535 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-22 06:24:54,535 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:24:54,535 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-22 06:24:54,537 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-08-22 06:24:54,538 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand 8 states. [2020-08-22 06:24:54,697 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:24:54,698 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-08-22 06:24:54,699 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-22 06:24:54,699 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 18 [2020-08-22 06:24:54,699 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:24:54,700 INFO L225 Difference]: With dead ends: 29 [2020-08-22 06:24:54,700 INFO L226 Difference]: Without dead ends: 20 [2020-08-22 06:24:54,701 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=54, Invalid=102, Unknown=0, NotChecked=0, Total=156 [2020-08-22 06:24:54,701 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-22 06:24:54,707 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-22 06:24:54,708 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-22 06:24:54,708 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2020-08-22 06:24:54,709 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 18 [2020-08-22 06:24:54,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:24:54,709 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2020-08-22 06:24:54,709 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-22 06:24:54,709 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2020-08-22 06:24:54,710 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-22 06:24:54,710 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:24:54,710 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:24:54,710 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-22 06:24:54,711 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:24:54,711 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:24:54,711 INFO L82 PathProgramCache]: Analyzing trace with hash -1436441002, now seen corresponding path program 5 times [2020-08-22 06:24:54,711 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:24:54,712 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1220098757] [2020-08-22 06:24:54,712 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:24:54,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:54,779 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:24:54,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:54,782 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 1 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 06:24:54,782 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1220098757] [2020-08-22 06:24:54,783 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:24:54,783 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-22 06:24:54,783 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [137885522] [2020-08-22 06:24:54,784 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-22 06:24:54,784 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:24:54,784 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-22 06:24:54,784 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2020-08-22 06:24:54,785 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 9 states. [2020-08-22 06:24:54,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:24:54,922 INFO L93 Difference]: Finished difference Result 30 states and 35 transitions. [2020-08-22 06:24:54,923 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-22 06:24:54,923 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2020-08-22 06:24:54,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:24:54,924 INFO L225 Difference]: With dead ends: 30 [2020-08-22 06:24:54,924 INFO L226 Difference]: Without dead ends: 21 [2020-08-22 06:24:54,924 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=70, Invalid=140, Unknown=0, NotChecked=0, Total=210 [2020-08-22 06:24:54,925 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-22 06:24:54,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-22 06:24:54,929 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-22 06:24:54,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2020-08-22 06:24:54,930 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 19 [2020-08-22 06:24:54,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:24:54,930 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2020-08-22 06:24:54,930 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-22 06:24:54,931 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2020-08-22 06:24:54,931 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-22 06:24:54,931 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:24:54,931 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:24:54,932 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-22 06:24:54,932 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:24:54,932 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:24:54,932 INFO L82 PathProgramCache]: Analyzing trace with hash 195574446, now seen corresponding path program 6 times [2020-08-22 06:24:54,933 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:24:54,933 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [178717976] [2020-08-22 06:24:54,933 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:24:54,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:54,967 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:24:54,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:54,970 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-22 06:24:54,971 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [178717976] [2020-08-22 06:24:54,971 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:24:54,971 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-08-22 06:24:54,972 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [526275285] [2020-08-22 06:24:54,972 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-22 06:24:54,972 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:24:54,972 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-22 06:24:54,973 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-22 06:24:54,973 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand 4 states. [2020-08-22 06:24:54,987 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:24:54,988 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2020-08-22 06:24:54,988 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-22 06:24:54,988 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2020-08-22 06:24:54,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:24:54,989 INFO L225 Difference]: With dead ends: 30 [2020-08-22 06:24:54,989 INFO L226 Difference]: Without dead ends: 25 [2020-08-22 06:24:54,990 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-22 06:24:54,990 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-22 06:24:54,994 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-08-22 06:24:54,995 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-22 06:24:54,995 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 29 transitions. [2020-08-22 06:24:54,996 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 29 transitions. Word has length 20 [2020-08-22 06:24:54,996 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:24:54,996 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 29 transitions. [2020-08-22 06:24:54,996 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-22 06:24:54,996 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 29 transitions. [2020-08-22 06:24:54,997 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-22 06:24:54,997 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:24:54,997 INFO L422 BasicCegarLoop]: trace histogram [6, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:24:54,998 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-22 06:24:54,998 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:24:54,998 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:24:54,998 INFO L82 PathProgramCache]: Analyzing trace with hash 389290560, now seen corresponding path program 7 times [2020-08-22 06:24:54,998 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:24:54,999 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1709673711] [2020-08-22 06:24:54,999 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:24:55,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:55,034 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:24:55,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:55,037 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-22 06:24:55,037 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1709673711] [2020-08-22 06:24:55,037 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:24:55,038 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-22 06:24:55,038 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1492251090] [2020-08-22 06:24:55,038 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-22 06:24:55,039 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:24:55,039 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-22 06:24:55,039 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-08-22 06:24:55,039 INFO L87 Difference]: Start difference. First operand 25 states and 29 transitions. Second operand 5 states. [2020-08-22 06:24:55,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:24:55,058 INFO L93 Difference]: Finished difference Result 34 states and 40 transitions. [2020-08-22 06:24:55,059 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-22 06:24:55,059 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 24 [2020-08-22 06:24:55,059 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:24:55,060 INFO L225 Difference]: With dead ends: 34 [2020-08-22 06:24:55,060 INFO L226 Difference]: Without dead ends: 29 [2020-08-22 06:24:55,060 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-08-22 06:24:55,061 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-22 06:24:55,065 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-08-22 06:24:55,065 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-22 06:24:55,066 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 35 transitions. [2020-08-22 06:24:55,066 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 35 transitions. Word has length 24 [2020-08-22 06:24:55,067 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:24:55,067 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 35 transitions. [2020-08-22 06:24:55,067 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-22 06:24:55,067 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 35 transitions. [2020-08-22 06:24:55,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-22 06:24:55,068 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:24:55,068 INFO L422 BasicCegarLoop]: trace histogram [6, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:24:55,068 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-22 06:24:55,069 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:24:55,069 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:24:55,069 INFO L82 PathProgramCache]: Analyzing trace with hash -1279139630, now seen corresponding path program 8 times [2020-08-22 06:24:55,069 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:24:55,069 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2021081892] [2020-08-22 06:24:55,070 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:24:55,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:55,112 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:24:55,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:55,116 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-22 06:24:55,116 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2021081892] [2020-08-22 06:24:55,116 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:24:55,116 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-22 06:24:55,117 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1174760373] [2020-08-22 06:24:55,117 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-22 06:24:55,117 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:24:55,118 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-22 06:24:55,118 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-08-22 06:24:55,118 INFO L87 Difference]: Start difference. First operand 29 states and 35 transitions. Second operand 6 states. [2020-08-22 06:24:55,144 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:24:55,145 INFO L93 Difference]: Finished difference Result 38 states and 46 transitions. [2020-08-22 06:24:55,145 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-22 06:24:55,145 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 28 [2020-08-22 06:24:55,146 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:24:55,146 INFO L225 Difference]: With dead ends: 38 [2020-08-22 06:24:55,146 INFO L226 Difference]: Without dead ends: 33 [2020-08-22 06:24:55,147 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-08-22 06:24:55,147 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-22 06:24:55,152 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-08-22 06:24:55,153 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-22 06:24:55,153 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 41 transitions. [2020-08-22 06:24:55,153 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 41 transitions. Word has length 28 [2020-08-22 06:24:55,154 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:24:55,154 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 41 transitions. [2020-08-22 06:24:55,154 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-22 06:24:55,154 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 41 transitions. [2020-08-22 06:24:55,155 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-22 06:24:55,155 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:24:55,155 INFO L422 BasicCegarLoop]: trace histogram [6, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:24:55,156 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-22 06:24:55,156 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:24:55,156 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:24:55,156 INFO L82 PathProgramCache]: Analyzing trace with hash 805703268, now seen corresponding path program 9 times [2020-08-22 06:24:55,156 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:24:55,157 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2007200094] [2020-08-22 06:24:55,157 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:24:55,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:55,239 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:24:55,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:55,243 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 25 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-22 06:24:55,244 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2007200094] [2020-08-22 06:24:55,244 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:24:55,244 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-22 06:24:55,244 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1144961922] [2020-08-22 06:24:55,245 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-22 06:24:55,245 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:24:55,245 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-22 06:24:55,246 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2020-08-22 06:24:55,246 INFO L87 Difference]: Start difference. First operand 33 states and 41 transitions. Second operand 10 states. [2020-08-22 06:24:55,435 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:24:55,435 INFO L93 Difference]: Finished difference Result 54 states and 70 transitions. [2020-08-22 06:24:55,436 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-22 06:24:55,436 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 32 [2020-08-22 06:24:55,436 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:24:55,437 INFO L225 Difference]: With dead ends: 54 [2020-08-22 06:24:55,437 INFO L226 Difference]: Without dead ends: 34 [2020-08-22 06:24:55,438 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-08-22 06:24:55,438 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-22 06:24:55,444 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-08-22 06:24:55,444 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-22 06:24:55,445 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 42 transitions. [2020-08-22 06:24:55,445 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 42 transitions. Word has length 32 [2020-08-22 06:24:55,446 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:24:55,446 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 42 transitions. [2020-08-22 06:24:55,446 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-22 06:24:55,446 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 42 transitions. [2020-08-22 06:24:55,447 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-22 06:24:55,447 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:24:55,455 INFO L422 BasicCegarLoop]: trace histogram [7, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:24:55,455 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-22 06:24:55,456 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:24:55,456 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:24:55,456 INFO L82 PathProgramCache]: Analyzing trace with hash 1833781516, now seen corresponding path program 10 times [2020-08-22 06:24:55,456 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:24:55,457 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [686173153] [2020-08-22 06:24:55,457 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:24:55,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:55,554 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:24:55,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:55,558 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 28 proven. 28 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-22 06:24:55,558 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [686173153] [2020-08-22 06:24:55,558 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:24:55,559 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-22 06:24:55,559 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1804817830] [2020-08-22 06:24:55,559 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-22 06:24:55,559 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:24:55,560 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-22 06:24:55,560 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=90, Unknown=0, NotChecked=0, Total=110 [2020-08-22 06:24:55,560 INFO L87 Difference]: Start difference. First operand 34 states and 42 transitions. Second operand 11 states. [2020-08-22 06:24:55,771 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:24:55,771 INFO L93 Difference]: Finished difference Result 55 states and 71 transitions. [2020-08-22 06:24:55,772 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-22 06:24:55,772 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 33 [2020-08-22 06:24:55,772 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:24:55,773 INFO L225 Difference]: With dead ends: 55 [2020-08-22 06:24:55,773 INFO L226 Difference]: Without dead ends: 35 [2020-08-22 06:24:55,773 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=108, Invalid=234, Unknown=0, NotChecked=0, Total=342 [2020-08-22 06:24:55,774 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-22 06:24:55,779 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-08-22 06:24:55,779 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-22 06:24:55,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 43 transitions. [2020-08-22 06:24:55,780 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 43 transitions. Word has length 33 [2020-08-22 06:24:55,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:24:55,780 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 43 transitions. [2020-08-22 06:24:55,780 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-22 06:24:55,780 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 43 transitions. [2020-08-22 06:24:55,781 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-22 06:24:55,781 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:24:55,781 INFO L422 BasicCegarLoop]: trace histogram [8, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:24:55,782 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-22 06:24:55,782 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:24:55,782 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:24:55,782 INFO L82 PathProgramCache]: Analyzing trace with hash -655531164, now seen corresponding path program 11 times [2020-08-22 06:24:55,782 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:24:55,783 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [438544374] [2020-08-22 06:24:55,783 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:24:55,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:55,897 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:24:55,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:55,900 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 31 proven. 36 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-22 06:24:55,901 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [438544374] [2020-08-22 06:24:55,901 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:24:55,901 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-22 06:24:55,901 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1068867522] [2020-08-22 06:24:55,902 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-22 06:24:55,902 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:24:55,902 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-22 06:24:55,902 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=110, Unknown=0, NotChecked=0, Total=132 [2020-08-22 06:24:55,903 INFO L87 Difference]: Start difference. First operand 35 states and 43 transitions. Second operand 12 states. [2020-08-22 06:24:56,135 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:24:56,135 INFO L93 Difference]: Finished difference Result 56 states and 72 transitions. [2020-08-22 06:24:56,136 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-22 06:24:56,136 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 34 [2020-08-22 06:24:56,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:24:56,137 INFO L225 Difference]: With dead ends: 56 [2020-08-22 06:24:56,137 INFO L226 Difference]: Without dead ends: 36 [2020-08-22 06:24:56,138 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=130, Invalid=290, Unknown=0, NotChecked=0, Total=420 [2020-08-22 06:24:56,138 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-22 06:24:56,142 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-08-22 06:24:56,143 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-22 06:24:56,143 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 44 transitions. [2020-08-22 06:24:56,144 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 44 transitions. Word has length 34 [2020-08-22 06:24:56,144 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:24:56,144 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 44 transitions. [2020-08-22 06:24:56,144 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-22 06:24:56,144 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 44 transitions. [2020-08-22 06:24:56,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-22 06:24:56,145 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:24:56,145 INFO L422 BasicCegarLoop]: trace histogram [9, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:24:56,145 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-22 06:24:56,146 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:24:56,146 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:24:56,146 INFO L82 PathProgramCache]: Analyzing trace with hash -514812916, now seen corresponding path program 12 times [2020-08-22 06:24:56,146 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:24:56,146 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1484229659] [2020-08-22 06:24:56,147 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:24:56,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:56,274 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:24:56,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:56,286 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 34 proven. 45 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-22 06:24:56,288 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1484229659] [2020-08-22 06:24:56,288 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:24:56,288 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-22 06:24:56,288 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [610999754] [2020-08-22 06:24:56,290 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-22 06:24:56,290 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:24:56,290 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-22 06:24:56,290 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=132, Unknown=0, NotChecked=0, Total=156 [2020-08-22 06:24:56,290 INFO L87 Difference]: Start difference. First operand 36 states and 44 transitions. Second operand 13 states. [2020-08-22 06:24:56,587 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:24:56,587 INFO L93 Difference]: Finished difference Result 57 states and 73 transitions. [2020-08-22 06:24:56,587 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-22 06:24:56,588 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 35 [2020-08-22 06:24:56,588 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:24:56,588 INFO L225 Difference]: With dead ends: 57 [2020-08-22 06:24:56,588 INFO L226 Difference]: Without dead ends: 37 [2020-08-22 06:24:56,589 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=154, Invalid=352, Unknown=0, NotChecked=0, Total=506 [2020-08-22 06:24:56,590 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-22 06:24:56,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-08-22 06:24:56,595 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-22 06:24:56,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 45 transitions. [2020-08-22 06:24:56,595 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 45 transitions. Word has length 35 [2020-08-22 06:24:56,596 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:24:56,596 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 45 transitions. [2020-08-22 06:24:56,596 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-22 06:24:56,596 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 45 transitions. [2020-08-22 06:24:56,596 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-22 06:24:56,597 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:24:56,597 INFO L422 BasicCegarLoop]: trace histogram [10, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:24:56,597 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-22 06:24:56,597 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:24:56,597 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:24:56,598 INFO L82 PathProgramCache]: Analyzing trace with hash -447514524, now seen corresponding path program 13 times [2020-08-22 06:24:56,598 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:24:56,598 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [653831591] [2020-08-22 06:24:56,598 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:24:56,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:56,732 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:24:56,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:56,736 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 37 proven. 55 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-22 06:24:56,736 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [653831591] [2020-08-22 06:24:56,736 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:24:56,737 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-22 06:24:56,737 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1831101276] [2020-08-22 06:24:56,737 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-22 06:24:56,737 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:24:56,738 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-22 06:24:56,738 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=156, Unknown=0, NotChecked=0, Total=182 [2020-08-22 06:24:56,738 INFO L87 Difference]: Start difference. First operand 37 states and 45 transitions. Second operand 14 states. [2020-08-22 06:24:57,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:24:57,093 INFO L93 Difference]: Finished difference Result 58 states and 74 transitions. [2020-08-22 06:24:57,095 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-22 06:24:57,095 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 36 [2020-08-22 06:24:57,095 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:24:57,096 INFO L225 Difference]: With dead ends: 58 [2020-08-22 06:24:57,096 INFO L226 Difference]: Without dead ends: 38 [2020-08-22 06:24:57,097 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=180, Invalid=420, Unknown=0, NotChecked=0, Total=600 [2020-08-22 06:24:57,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-22 06:24:57,102 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-08-22 06:24:57,102 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-22 06:24:57,103 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 46 transitions. [2020-08-22 06:24:57,103 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 46 transitions. Word has length 36 [2020-08-22 06:24:57,103 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:24:57,103 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 46 transitions. [2020-08-22 06:24:57,104 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-22 06:24:57,104 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 46 transitions. [2020-08-22 06:24:57,104 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-22 06:24:57,104 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:24:57,104 INFO L422 BasicCegarLoop]: trace histogram [11, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:24:57,105 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-22 06:24:57,105 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:24:57,105 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:24:57,105 INFO L82 PathProgramCache]: Analyzing trace with hash 1638735628, now seen corresponding path program 14 times [2020-08-22 06:24:57,105 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:24:57,106 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1402130794] [2020-08-22 06:24:57,106 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:24:57,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:57,271 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:24:57,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:57,275 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 40 proven. 66 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-22 06:24:57,276 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1402130794] [2020-08-22 06:24:57,276 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:24:57,276 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-22 06:24:57,276 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1101349446] [2020-08-22 06:24:57,277 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-22 06:24:57,277 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:24:57,277 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-22 06:24:57,278 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=182, Unknown=0, NotChecked=0, Total=210 [2020-08-22 06:24:57,278 INFO L87 Difference]: Start difference. First operand 38 states and 46 transitions. Second operand 15 states. [2020-08-22 06:24:57,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:24:57,674 INFO L93 Difference]: Finished difference Result 59 states and 75 transitions. [2020-08-22 06:24:57,674 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-22 06:24:57,675 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 37 [2020-08-22 06:24:57,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:24:57,675 INFO L225 Difference]: With dead ends: 59 [2020-08-22 06:24:57,675 INFO L226 Difference]: Without dead ends: 39 [2020-08-22 06:24:57,676 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=208, Invalid=494, Unknown=0, NotChecked=0, Total=702 [2020-08-22 06:24:57,677 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-22 06:24:57,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-22 06:24:57,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-22 06:24:57,683 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 47 transitions. [2020-08-22 06:24:57,683 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 47 transitions. Word has length 37 [2020-08-22 06:24:57,683 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:24:57,683 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 47 transitions. [2020-08-22 06:24:57,683 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-22 06:24:57,683 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 47 transitions. [2020-08-22 06:24:57,684 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-22 06:24:57,684 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:24:57,684 INFO L422 BasicCegarLoop]: trace histogram [12, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:24:57,685 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-22 06:24:57,685 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:24:57,685 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:24:57,685 INFO L82 PathProgramCache]: Analyzing trace with hash 1887980900, now seen corresponding path program 15 times [2020-08-22 06:24:57,686 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:24:57,686 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [41142924] [2020-08-22 06:24:57,686 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:24:57,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:57,854 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:24:57,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:57,857 INFO L134 CoverageAnalysis]: Checked inductivity of 142 backedges. 43 proven. 78 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-22 06:24:57,857 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [41142924] [2020-08-22 06:24:57,857 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:24:57,858 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-22 06:24:57,858 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2053386173] [2020-08-22 06:24:57,858 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-22 06:24:57,858 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:24:57,859 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-22 06:24:57,859 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=210, Unknown=0, NotChecked=0, Total=240 [2020-08-22 06:24:57,859 INFO L87 Difference]: Start difference. First operand 39 states and 47 transitions. Second operand 16 states. [2020-08-22 06:24:58,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:24:58,309 INFO L93 Difference]: Finished difference Result 60 states and 76 transitions. [2020-08-22 06:24:58,309 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-22 06:24:58,309 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 38 [2020-08-22 06:24:58,310 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:24:58,310 INFO L225 Difference]: With dead ends: 60 [2020-08-22 06:24:58,310 INFO L226 Difference]: Without dead ends: 40 [2020-08-22 06:24:58,311 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=238, Invalid=574, Unknown=0, NotChecked=0, Total=812 [2020-08-22 06:24:58,312 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-22 06:24:58,317 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-08-22 06:24:58,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-22 06:24:58,317 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 48 transitions. [2020-08-22 06:24:58,318 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 48 transitions. Word has length 38 [2020-08-22 06:24:58,318 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:24:58,318 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 48 transitions. [2020-08-22 06:24:58,318 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-22 06:24:58,318 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 48 transitions. [2020-08-22 06:24:58,319 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-22 06:24:58,319 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:24:58,319 INFO L422 BasicCegarLoop]: trace histogram [13, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:24:58,319 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-22 06:24:58,319 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:24:58,319 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:24:58,320 INFO L82 PathProgramCache]: Analyzing trace with hash 1024649740, now seen corresponding path program 16 times [2020-08-22 06:24:58,320 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:24:58,320 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1108012663] [2020-08-22 06:24:58,320 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:24:58,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:58,516 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:24:58,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:58,520 INFO L134 CoverageAnalysis]: Checked inductivity of 158 backedges. 46 proven. 91 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-22 06:24:58,520 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1108012663] [2020-08-22 06:24:58,520 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:24:58,520 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-22 06:24:58,521 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1256101282] [2020-08-22 06:24:58,521 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-22 06:24:58,521 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:24:58,522 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-22 06:24:58,522 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=240, Unknown=0, NotChecked=0, Total=272 [2020-08-22 06:24:58,522 INFO L87 Difference]: Start difference. First operand 40 states and 48 transitions. Second operand 17 states. [2020-08-22 06:24:59,034 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:24:59,034 INFO L93 Difference]: Finished difference Result 61 states and 77 transitions. [2020-08-22 06:24:59,040 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-22 06:24:59,040 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 39 [2020-08-22 06:24:59,040 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:24:59,041 INFO L225 Difference]: With dead ends: 61 [2020-08-22 06:24:59,041 INFO L226 Difference]: Without dead ends: 41 [2020-08-22 06:24:59,042 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 104 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=270, Invalid=660, Unknown=0, NotChecked=0, Total=930 [2020-08-22 06:24:59,042 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-22 06:24:59,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-22 06:24:59,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-22 06:24:59,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 49 transitions. [2020-08-22 06:24:59,049 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 49 transitions. Word has length 39 [2020-08-22 06:24:59,049 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:24:59,049 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 49 transitions. [2020-08-22 06:24:59,049 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-22 06:24:59,049 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 49 transitions. [2020-08-22 06:24:59,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-22 06:24:59,050 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:24:59,050 INFO L422 BasicCegarLoop]: trace histogram [14, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:24:59,051 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-22 06:24:59,051 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:24:59,051 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:24:59,051 INFO L82 PathProgramCache]: Analyzing trace with hash 31187556, now seen corresponding path program 17 times [2020-08-22 06:24:59,051 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:24:59,051 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1919112644] [2020-08-22 06:24:59,052 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:24:59,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:59,274 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:24:59,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:59,278 INFO L134 CoverageAnalysis]: Checked inductivity of 175 backedges. 49 proven. 105 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-22 06:24:59,278 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1919112644] [2020-08-22 06:24:59,278 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:24:59,278 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-22 06:24:59,279 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [273227634] [2020-08-22 06:24:59,279 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-22 06:24:59,279 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:24:59,279 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-22 06:24:59,280 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=272, Unknown=0, NotChecked=0, Total=306 [2020-08-22 06:24:59,280 INFO L87 Difference]: Start difference. First operand 41 states and 49 transitions. Second operand 18 states. [2020-08-22 06:24:59,841 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:24:59,842 INFO L93 Difference]: Finished difference Result 62 states and 78 transitions. [2020-08-22 06:24:59,845 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-22 06:24:59,845 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 40 [2020-08-22 06:24:59,845 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:24:59,846 INFO L225 Difference]: With dead ends: 62 [2020-08-22 06:24:59,846 INFO L226 Difference]: Without dead ends: 42 [2020-08-22 06:24:59,847 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 119 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=304, Invalid=752, Unknown=0, NotChecked=0, Total=1056 [2020-08-22 06:24:59,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-22 06:24:59,855 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-08-22 06:24:59,855 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-22 06:24:59,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 50 transitions. [2020-08-22 06:24:59,856 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 50 transitions. Word has length 40 [2020-08-22 06:24:59,856 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:24:59,856 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 50 transitions. [2020-08-22 06:24:59,856 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-22 06:24:59,856 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 50 transitions. [2020-08-22 06:24:59,857 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-22 06:24:59,857 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:24:59,858 INFO L422 BasicCegarLoop]: trace histogram [15, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:24:59,859 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-22 06:24:59,859 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:24:59,859 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:24:59,859 INFO L82 PathProgramCache]: Analyzing trace with hash -701369076, now seen corresponding path program 18 times [2020-08-22 06:24:59,860 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:24:59,860 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2067808317] [2020-08-22 06:24:59,860 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:24:59,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:25:00,114 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:25:00,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:25:00,119 INFO L134 CoverageAnalysis]: Checked inductivity of 193 backedges. 52 proven. 120 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-22 06:25:00,119 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2067808317] [2020-08-22 06:25:00,119 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:25:00,119 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-22 06:25:00,120 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [164452372] [2020-08-22 06:25:00,120 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-22 06:25:00,120 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:25:00,121 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-22 06:25:00,121 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=306, Unknown=0, NotChecked=0, Total=342 [2020-08-22 06:25:00,121 INFO L87 Difference]: Start difference. First operand 42 states and 50 transitions. Second operand 19 states. [2020-08-22 06:25:00,803 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:25:00,803 INFO L93 Difference]: Finished difference Result 63 states and 79 transitions. [2020-08-22 06:25:00,805 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-22 06:25:00,805 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 41 [2020-08-22 06:25:00,805 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:25:00,806 INFO L225 Difference]: With dead ends: 63 [2020-08-22 06:25:00,806 INFO L226 Difference]: Without dead ends: 43 [2020-08-22 06:25:00,806 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 135 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=340, Invalid=850, Unknown=0, NotChecked=0, Total=1190 [2020-08-22 06:25:00,807 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-22 06:25:00,815 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-22 06:25:00,815 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-22 06:25:00,816 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 51 transitions. [2020-08-22 06:25:00,816 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 51 transitions. Word has length 41 [2020-08-22 06:25:00,816 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:25:00,816 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 51 transitions. [2020-08-22 06:25:00,816 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-22 06:25:00,816 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 51 transitions. [2020-08-22 06:25:00,817 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-22 06:25:00,817 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:25:00,817 INFO L422 BasicCegarLoop]: trace histogram [16, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:25:00,817 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-22 06:25:00,818 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:25:00,818 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:25:00,818 INFO L82 PathProgramCache]: Analyzing trace with hash -1935788188, now seen corresponding path program 19 times [2020-08-22 06:25:00,818 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:25:00,818 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1348454642] [2020-08-22 06:25:00,818 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:25:00,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:25:01,076 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:25:01,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:25:01,080 INFO L134 CoverageAnalysis]: Checked inductivity of 212 backedges. 55 proven. 136 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-22 06:25:01,081 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1348454642] [2020-08-22 06:25:01,081 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:25:01,081 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-22 06:25:01,081 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [919520213] [2020-08-22 06:25:01,082 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-22 06:25:01,082 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:25:01,082 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-22 06:25:01,083 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=342, Unknown=0, NotChecked=0, Total=380 [2020-08-22 06:25:01,083 INFO L87 Difference]: Start difference. First operand 43 states and 51 transitions. Second operand 20 states. [2020-08-22 06:25:01,802 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:25:01,803 INFO L93 Difference]: Finished difference Result 64 states and 80 transitions. [2020-08-22 06:25:01,805 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-22 06:25:01,805 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 42 [2020-08-22 06:25:01,805 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:25:01,806 INFO L225 Difference]: With dead ends: 64 [2020-08-22 06:25:01,806 INFO L226 Difference]: Without dead ends: 44 [2020-08-22 06:25:01,806 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 152 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=378, Invalid=954, Unknown=0, NotChecked=0, Total=1332 [2020-08-22 06:25:01,807 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-22 06:25:01,813 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-08-22 06:25:01,813 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-22 06:25:01,813 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 52 transitions. [2020-08-22 06:25:01,814 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 52 transitions. Word has length 42 [2020-08-22 06:25:01,814 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:25:01,814 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 52 transitions. [2020-08-22 06:25:01,814 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-22 06:25:01,814 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 52 transitions. [2020-08-22 06:25:01,815 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-22 06:25:01,815 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:25:01,815 INFO L422 BasicCegarLoop]: trace histogram [17, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:25:01,815 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-22 06:25:01,815 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:25:01,816 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:25:01,816 INFO L82 PathProgramCache]: Analyzing trace with hash -1548074996, now seen corresponding path program 20 times [2020-08-22 06:25:01,816 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:25:01,816 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [181755248] [2020-08-22 06:25:01,816 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:25:01,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:25:02,111 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:25:02,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:25:02,115 INFO L134 CoverageAnalysis]: Checked inductivity of 232 backedges. 58 proven. 153 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-22 06:25:02,115 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [181755248] [2020-08-22 06:25:02,115 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:25:02,115 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-22 06:25:02,116 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1586915271] [2020-08-22 06:25:02,116 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-22 06:25:02,116 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:25:02,116 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-22 06:25:02,117 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=380, Unknown=0, NotChecked=0, Total=420 [2020-08-22 06:25:02,117 INFO L87 Difference]: Start difference. First operand 44 states and 52 transitions. Second operand 21 states. [2020-08-22 06:25:03,020 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:25:03,020 INFO L93 Difference]: Finished difference Result 65 states and 81 transitions. [2020-08-22 06:25:03,020 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-22 06:25:03,021 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 43 [2020-08-22 06:25:03,021 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:25:03,022 INFO L225 Difference]: With dead ends: 65 [2020-08-22 06:25:03,022 INFO L226 Difference]: Without dead ends: 45 [2020-08-22 06:25:03,023 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 170 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=418, Invalid=1064, Unknown=0, NotChecked=0, Total=1482 [2020-08-22 06:25:03,023 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-22 06:25:03,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-08-22 06:25:03,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-22 06:25:03,030 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 53 transitions. [2020-08-22 06:25:03,031 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 53 transitions. Word has length 43 [2020-08-22 06:25:03,031 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:25:03,031 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 53 transitions. [2020-08-22 06:25:03,031 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-22 06:25:03,031 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 53 transitions. [2020-08-22 06:25:03,032 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-22 06:25:03,032 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:25:03,032 INFO L422 BasicCegarLoop]: trace histogram [18, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:25:03,032 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-22 06:25:03,032 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:25:03,033 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:25:03,033 INFO L82 PathProgramCache]: Analyzing trace with hash 1881099364, now seen corresponding path program 21 times [2020-08-22 06:25:03,033 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:25:03,033 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [971477460] [2020-08-22 06:25:03,033 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:25:03,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:25:03,319 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:25:03,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:25:03,323 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 61 proven. 171 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-22 06:25:03,324 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [971477460] [2020-08-22 06:25:03,324 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:25:03,324 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-22 06:25:03,324 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [270657315] [2020-08-22 06:25:03,325 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-22 06:25:03,325 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:25:03,325 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-22 06:25:03,325 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=420, Unknown=0, NotChecked=0, Total=462 [2020-08-22 06:25:03,325 INFO L87 Difference]: Start difference. First operand 45 states and 53 transitions. Second operand 22 states. [2020-08-22 06:25:04,235 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:25:04,236 INFO L93 Difference]: Finished difference Result 66 states and 82 transitions. [2020-08-22 06:25:04,236 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-22 06:25:04,237 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 44 [2020-08-22 06:25:04,237 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:25:04,237 INFO L225 Difference]: With dead ends: 66 [2020-08-22 06:25:04,237 INFO L226 Difference]: Without dead ends: 46 [2020-08-22 06:25:04,238 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 189 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=460, Invalid=1180, Unknown=0, NotChecked=0, Total=1640 [2020-08-22 06:25:04,238 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-22 06:25:04,243 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-08-22 06:25:04,243 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-22 06:25:04,244 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 54 transitions. [2020-08-22 06:25:04,244 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 54 transitions. Word has length 44 [2020-08-22 06:25:04,244 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:25:04,244 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 54 transitions. [2020-08-22 06:25:04,244 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-22 06:25:04,244 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 54 transitions. [2020-08-22 06:25:04,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-22 06:25:04,245 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:25:04,245 INFO L422 BasicCegarLoop]: trace histogram [19, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:25:04,245 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-22 06:25:04,245 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:25:04,245 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:25:04,246 INFO L82 PathProgramCache]: Analyzing trace with hash 811322124, now seen corresponding path program 22 times [2020-08-22 06:25:04,246 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:25:04,246 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1454835817] [2020-08-22 06:25:04,246 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:25:04,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:25:04,572 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:25:04,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:25:04,578 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 64 proven. 190 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-22 06:25:04,578 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1454835817] [2020-08-22 06:25:04,578 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:25:04,578 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-22 06:25:04,579 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [118686787] [2020-08-22 06:25:04,580 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-22 06:25:04,580 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:25:04,581 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-22 06:25:04,581 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=462, Unknown=0, NotChecked=0, Total=506 [2020-08-22 06:25:04,581 INFO L87 Difference]: Start difference. First operand 46 states and 54 transitions. Second operand 23 states. [2020-08-22 06:25:05,626 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:25:05,626 INFO L93 Difference]: Finished difference Result 67 states and 83 transitions. [2020-08-22 06:25:05,627 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-22 06:25:05,628 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 45 [2020-08-22 06:25:05,628 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:25:05,628 INFO L225 Difference]: With dead ends: 67 [2020-08-22 06:25:05,629 INFO L226 Difference]: Without dead ends: 47 [2020-08-22 06:25:05,629 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 209 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=504, Invalid=1302, Unknown=0, NotChecked=0, Total=1806 [2020-08-22 06:25:05,630 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-22 06:25:05,642 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-08-22 06:25:05,642 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-22 06:25:05,643 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 55 transitions. [2020-08-22 06:25:05,643 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 55 transitions. Word has length 45 [2020-08-22 06:25:05,643 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:25:05,643 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 55 transitions. [2020-08-22 06:25:05,644 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-22 06:25:05,644 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 55 transitions. [2020-08-22 06:25:05,644 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-22 06:25:05,644 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:25:05,644 INFO L422 BasicCegarLoop]: trace histogram [20, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:25:05,645 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-22 06:25:05,645 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:25:05,645 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:25:05,645 INFO L82 PathProgramCache]: Analyzing trace with hash 2007966052, now seen corresponding path program 23 times [2020-08-22 06:25:05,645 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:25:05,645 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [426607781] [2020-08-22 06:25:05,646 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:25:05,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:25:06,105 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:25:06,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:25:06,111 INFO L134 CoverageAnalysis]: Checked inductivity of 298 backedges. 67 proven. 210 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-22 06:25:06,111 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [426607781] [2020-08-22 06:25:06,111 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:25:06,112 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-22 06:25:06,112 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [520684245] [2020-08-22 06:25:06,112 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-22 06:25:06,112 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:25:06,113 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-22 06:25:06,113 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=506, Unknown=0, NotChecked=0, Total=552 [2020-08-22 06:25:06,113 INFO L87 Difference]: Start difference. First operand 47 states and 55 transitions. Second operand 24 states. [2020-08-22 06:25:07,252 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:25:07,252 INFO L93 Difference]: Finished difference Result 68 states and 84 transitions. [2020-08-22 06:25:07,254 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-22 06:25:07,255 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 46 [2020-08-22 06:25:07,255 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:25:07,256 INFO L225 Difference]: With dead ends: 68 [2020-08-22 06:25:07,256 INFO L226 Difference]: Without dead ends: 48 [2020-08-22 06:25:07,257 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 230 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=550, Invalid=1430, Unknown=0, NotChecked=0, Total=1980 [2020-08-22 06:25:07,258 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-22 06:25:07,264 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-08-22 06:25:07,264 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-22 06:25:07,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 56 transitions. [2020-08-22 06:25:07,265 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 56 transitions. Word has length 46 [2020-08-22 06:25:07,265 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:25:07,265 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 56 transitions. [2020-08-22 06:25:07,265 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-22 06:25:07,265 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 56 transitions. [2020-08-22 06:25:07,266 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-22 06:25:07,266 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:25:07,266 INFO L422 BasicCegarLoop]: trace histogram [21, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:25:07,266 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-22 06:25:07,266 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:25:07,267 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:25:07,267 INFO L82 PathProgramCache]: Analyzing trace with hash 449222156, now seen corresponding path program 24 times [2020-08-22 06:25:07,267 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:25:07,267 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1099079102] [2020-08-22 06:25:07,267 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:25:07,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:25:07,688 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:25:07,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:25:07,693 INFO L134 CoverageAnalysis]: Checked inductivity of 322 backedges. 70 proven. 231 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-22 06:25:07,694 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1099079102] [2020-08-22 06:25:07,694 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:25:07,694 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-22 06:25:07,694 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1610854144] [2020-08-22 06:25:07,694 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-22 06:25:07,694 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:25:07,695 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-22 06:25:07,695 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=552, Unknown=0, NotChecked=0, Total=600 [2020-08-22 06:25:07,695 INFO L87 Difference]: Start difference. First operand 48 states and 56 transitions. Second operand 25 states. [2020-08-22 06:25:08,911 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:25:08,912 INFO L93 Difference]: Finished difference Result 69 states and 85 transitions. [2020-08-22 06:25:08,912 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-22 06:25:08,912 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 47 [2020-08-22 06:25:08,913 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:25:08,913 INFO L225 Difference]: With dead ends: 69 [2020-08-22 06:25:08,913 INFO L226 Difference]: Without dead ends: 49 [2020-08-22 06:25:08,915 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 252 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=598, Invalid=1564, Unknown=0, NotChecked=0, Total=2162 [2020-08-22 06:25:08,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-22 06:25:08,922 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-22 06:25:08,922 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-22 06:25:08,922 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 57 transitions. [2020-08-22 06:25:08,923 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 57 transitions. Word has length 47 [2020-08-22 06:25:08,923 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:25:08,923 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 57 transitions. [2020-08-22 06:25:08,923 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-22 06:25:08,923 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 57 transitions. [2020-08-22 06:25:08,923 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-22 06:25:08,924 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:25:08,924 INFO L422 BasicCegarLoop]: trace histogram [22, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:25:08,924 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-22 06:25:08,924 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:25:08,924 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:25:08,924 INFO L82 PathProgramCache]: Analyzing trace with hash -627198364, now seen corresponding path program 25 times [2020-08-22 06:25:08,925 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:25:08,925 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [749594282] [2020-08-22 06:25:08,925 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:25:08,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:25:08,978 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:25:08,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:25:08,981 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 340 trivial. 0 not checked. [2020-08-22 06:25:08,981 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [749594282] [2020-08-22 06:25:08,981 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 06:25:08,981 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-22 06:25:08,982 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [138174273] [2020-08-22 06:25:08,982 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-22 06:25:08,982 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:25:08,982 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-22 06:25:08,983 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-22 06:25:08,983 INFO L87 Difference]: Start difference. First operand 49 states and 57 transitions. Second operand 5 states. [2020-08-22 06:25:09,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:25:09,009 INFO L93 Difference]: Finished difference Result 66 states and 82 transitions. [2020-08-22 06:25:09,009 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-22 06:25:09,009 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 48 [2020-08-22 06:25:09,010 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:25:09,010 INFO L225 Difference]: With dead ends: 66 [2020-08-22 06:25:09,010 INFO L226 Difference]: Without dead ends: 0 [2020-08-22 06:25:09,010 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-22 06:25:09,011 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-08-22 06:25:09,011 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-08-22 06:25:09,011 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-08-22 06:25:09,011 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-08-22 06:25:09,011 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 48 [2020-08-22 06:25:09,011 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:25:09,011 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-08-22 06:25:09,012 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-22 06:25:09,012 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-08-22 06:25:09,012 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-08-22 06:25:09,012 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-22 06:25:09,014 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-08-22 06:25:09,244 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 156 DAG size of output: 12 [2020-08-22 06:25:09,251 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-08-22 06:25:09,251 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-08-22 06:25:09,251 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-08-22 06:25:09,251 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-08-22 06:25:09,251 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-08-22 06:25:09,251 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-08-22 06:25:09,252 INFO L268 CegarLoopResult]: For program point assume_abort_if_notENTRY(lines 3 5) no Hoare annotation was computed. [2020-08-22 06:25:09,252 INFO L268 CegarLoopResult]: For program point L4(line 4) no Hoare annotation was computed. [2020-08-22 06:25:09,252 INFO L268 CegarLoopResult]: For program point L4-2(lines 3 5) no Hoare annotation was computed. [2020-08-22 06:25:09,252 INFO L268 CegarLoopResult]: For program point assume_abort_if_notEXIT(lines 3 5) no Hoare annotation was computed. [2020-08-22 06:25:09,252 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 13 30) no Hoare annotation was computed. [2020-08-22 06:25:09,252 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 13 30) no Hoare annotation was computed. [2020-08-22 06:25:09,252 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 13 30) the Hoare annotation is: true [2020-08-22 06:25:09,253 INFO L268 CegarLoopResult]: For program point L28(line 28) no Hoare annotation was computed. [2020-08-22 06:25:09,253 INFO L264 CegarLoopResult]: At program point L24-2(lines 24 26) the Hoare annotation is: (= main_~k~0 4) [2020-08-22 06:25:09,253 INFO L264 CegarLoopResult]: At program point L24-3(lines 18 27) the Hoare annotation is: (or (= main_~k~0 4) (and (<= main_~i~0 0) (<= (+ main_~j~0 100) 0))) [2020-08-22 06:25:09,253 INFO L264 CegarLoopResult]: At program point L20-2(lines 20 22) the Hoare annotation is: (or (= main_~k~0 4) (<= main_~i~0 1)) [2020-08-22 06:25:09,253 INFO L268 CegarLoopResult]: For program point L20-3(lines 20 22) no Hoare annotation was computed. [2020-08-22 06:25:09,254 INFO L264 CegarLoopResult]: At program point L18-2(lines 18 27) the Hoare annotation is: (= main_~k~0 4) [2020-08-22 06:25:09,254 INFO L271 CegarLoopResult]: At program point __VERIFIER_assertENTRY(lines 6 11) the Hoare annotation is: true [2020-08-22 06:25:09,254 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertEXIT(lines 6 11) no Hoare annotation was computed. [2020-08-22 06:25:09,254 INFO L268 CegarLoopResult]: For program point L8(line 8) no Hoare annotation was computed. [2020-08-22 06:25:09,254 INFO L268 CegarLoopResult]: For program point L7(lines 7 9) no Hoare annotation was computed. [2020-08-22 06:25:09,254 INFO L268 CegarLoopResult]: For program point L7-2(lines 6 11) no Hoare annotation was computed. [2020-08-22 06:25:09,254 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 8) no Hoare annotation was computed. [2020-08-22 06:25:09,277 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.08 06:25:09 BoogieIcfgContainer [2020-08-22 06:25:09,277 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-22 06:25:09,279 INFO L168 Benchmark]: Toolchain (without parser) took 16555.85 ms. Allocated memory was 140.0 MB in the beginning and 353.9 MB in the end (delta: 213.9 MB). Free memory was 103.4 MB in the beginning and 203.6 MB in the end (delta: -100.2 MB). Peak memory consumption was 113.7 MB. Max. memory is 7.1 GB. [2020-08-22 06:25:09,280 INFO L168 Benchmark]: CDTParser took 0.84 ms. Allocated memory is still 140.0 MB. Free memory was 121.5 MB in the beginning and 121.3 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. [2020-08-22 06:25:09,280 INFO L168 Benchmark]: CACSL2BoogieTranslator took 267.34 ms. Allocated memory is still 140.0 MB. Free memory was 103.2 MB in the beginning and 93.8 MB in the end (delta: 9.4 MB). Peak memory consumption was 9.4 MB. Max. memory is 7.1 GB. [2020-08-22 06:25:09,281 INFO L168 Benchmark]: Boogie Preprocessor took 108.06 ms. Allocated memory was 140.0 MB in the beginning and 202.9 MB in the end (delta: 62.9 MB). Free memory was 93.8 MB in the beginning and 181.7 MB in the end (delta: -87.8 MB). Peak memory consumption was 12.9 MB. Max. memory is 7.1 GB. [2020-08-22 06:25:09,282 INFO L168 Benchmark]: RCFGBuilder took 261.21 ms. Allocated memory is still 202.9 MB. Free memory was 181.0 MB in the beginning and 169.0 MB in the end (delta: 12.0 MB). Peak memory consumption was 12.0 MB. Max. memory is 7.1 GB. [2020-08-22 06:25:09,282 INFO L168 Benchmark]: TraceAbstraction took 15911.43 ms. Allocated memory was 202.9 MB in the beginning and 353.9 MB in the end (delta: 151.0 MB). Free memory was 168.3 MB in the beginning and 203.6 MB in the end (delta: -35.3 MB). Peak memory consumption was 115.7 MB. Max. memory is 7.1 GB. [2020-08-22 06:25:09,285 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.84 ms. Allocated memory is still 140.0 MB. Free memory was 121.5 MB in the beginning and 121.3 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 267.34 ms. Allocated memory is still 140.0 MB. Free memory was 103.2 MB in the beginning and 93.8 MB in the end (delta: 9.4 MB). Peak memory consumption was 9.4 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 108.06 ms. Allocated memory was 140.0 MB in the beginning and 202.9 MB in the end (delta: 62.9 MB). Free memory was 93.8 MB in the beginning and 181.7 MB in the end (delta: -87.8 MB). Peak memory consumption was 12.9 MB. Max. memory is 7.1 GB. * RCFGBuilder took 261.21 ms. Allocated memory is still 202.9 MB. Free memory was 181.0 MB in the beginning and 169.0 MB in the end (delta: 12.0 MB). Peak memory consumption was 12.0 MB. Max. memory is 7.1 GB. * TraceAbstraction took 15911.43 ms. Allocated memory was 202.9 MB in the beginning and 353.9 MB in the end (delta: 151.0 MB). Free memory was 168.3 MB in the beginning and 203.6 MB in the end (delta: -35.3 MB). Peak memory consumption was 115.7 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 8]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 24]: Loop Invariant Derived loop invariant: k == 4 - InvariantResult [Line: 20]: Loop Invariant Derived loop invariant: k == 4 || i <= 1 - InvariantResult [Line: 18]: Loop Invariant Derived loop invariant: k == 4 || (i <= 0 && j + 100 <= 0) - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 25 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 15.5s, OverallIterations: 28, TraceHistogramMax: 22, AutomataDifference: 10.6s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.2s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 404 SDtfs, 15 SDslu, 3185 SDs, 0 SdLazy, 1131 SolverSat, 487 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 652 GetRequests, 112 SyntacticMatches, 0 SemanticMatches, 540 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2002 ImplicationChecksByTransitivity, 12.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=49occurred in iteration=27, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.2s AutomataMinimizationTime, 28 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 9 LocationsWithAnnotation, 37 PreInvPairs, 73 NumberOfFragments, 31 HoareAnnotationTreeSize, 37 FomulaSimplifications, 3216 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 9 FomulaSimplificationsInter, 271 FormulaSimplificationTreeSizeReductionInter, 0.1s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 4.0s InterpolantComputationTime, 871 NumberOfCodeBlocks, 871 NumberOfCodeBlocksAsserted, 28 NumberOfCheckSat, 843 ConstructedInterpolants, 0 QuantifiedInterpolants, 100903 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 28 InterpolantComputations, 4 PerfectInterpolantSequences, 1512/3323 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...