/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5 --traceabstraction.additional.smt.options interpolation-heuristic=SMALLESTAMONGWIDE --traceabstraction.additional.smt.options tolerance=0.3 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/simple_4-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-19 05:19:19,207 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-19 05:19:19,210 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-19 05:19:19,249 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-19 05:19:19,249 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-19 05:19:19,258 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-19 05:19:19,260 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-19 05:19:19,264 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-19 05:19:19,268 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-19 05:19:19,269 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-19 05:19:19,269 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-19 05:19:19,270 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-19 05:19:19,271 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-19 05:19:19,272 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-19 05:19:19,272 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-19 05:19:19,273 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-19 05:19:19,274 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-19 05:19:19,275 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-19 05:19:19,276 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-19 05:19:19,278 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-19 05:19:19,279 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-19 05:19:19,280 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-19 05:19:19,282 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-19 05:19:19,282 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-19 05:19:19,285 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-19 05:19:19,292 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-19 05:19:19,293 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-19 05:19:19,293 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-19 05:19:19,294 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-19 05:19:19,318 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-19 05:19:19,318 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-19 05:19:19,319 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-19 05:19:19,319 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-19 05:19:19,320 INFO L138 SettingsManager]: * Use SBE=true [2020-08-19 05:19:19,320 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-19 05:19:19,320 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-19 05:19:19,320 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-19 05:19:19,320 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-19 05:19:19,321 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-19 05:19:19,321 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-19 05:19:19,321 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-19 05:19:19,321 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-19 05:19:19,321 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-19 05:19:19,322 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-19 05:19:19,322 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-19 05:19:19,322 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-19 05:19:19,322 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-19 05:19:19,322 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-19 05:19:19,323 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-19 05:19:19,323 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-19 05:19:19,323 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-19 05:19:19,323 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-19 05:19:19,323 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-19 05:19:19,324 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-19 05:19:19,324 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-19 05:19:19,324 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-19 05:19:19,324 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-19 05:19:19,324 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-19 05:19:19,325 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.3; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.3; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.3; [2020-08-19 05:19:19,642 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-19 05:19:19,654 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-19 05:19:19,658 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-19 05:19:19,660 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-19 05:19:19,660 INFO L275 PluginConnector]: CDTParser initialized [2020-08-19 05:19:19,661 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/simple_4-2.c [2020-08-19 05:19:19,743 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/84f73fd49/e2fb3d4079c14368a51e50bccdb5115a/FLAG2eff94ba9 [2020-08-19 05:19:20,176 INFO L306 CDTParser]: Found 1 translation units. [2020-08-19 05:19:20,177 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-acceleration/simple_4-2.c [2020-08-19 05:19:20,183 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/84f73fd49/e2fb3d4079c14368a51e50bccdb5115a/FLAG2eff94ba9 [2020-08-19 05:19:20,564 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/84f73fd49/e2fb3d4079c14368a51e50bccdb5115a [2020-08-19 05:19:20,573 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-19 05:19:20,574 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-19 05:19:20,576 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-19 05:19:20,576 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-19 05:19:20,580 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-19 05:19:20,581 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 05:19:20" (1/1) ... [2020-08-19 05:19:20,584 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@425c36b8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 05:19:20, skipping insertion in model container [2020-08-19 05:19:20,584 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 05:19:20" (1/1) ... [2020-08-19 05:19:20,592 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-19 05:19:20,608 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-19 05:19:20,764 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 05:19:20,769 INFO L203 MainTranslator]: Completed pre-run [2020-08-19 05:19:20,784 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 05:19:20,799 INFO L208 MainTranslator]: Completed translation [2020-08-19 05:19:20,800 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 05:19:20 WrapperNode [2020-08-19 05:19:20,800 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-19 05:19:20,801 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-19 05:19:20,801 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-19 05:19:20,801 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-19 05:19:20,815 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 05:19:20" (1/1) ... [2020-08-19 05:19:20,816 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 05:19:20" (1/1) ... [2020-08-19 05:19:20,821 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 05:19:20" (1/1) ... [2020-08-19 05:19:20,821 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 05:19:20" (1/1) ... [2020-08-19 05:19:20,825 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 05:19:20" (1/1) ... [2020-08-19 05:19:20,830 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 05:19:20" (1/1) ... [2020-08-19 05:19:20,831 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 05:19:20" (1/1) ... [2020-08-19 05:19:20,924 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-19 05:19:20,925 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-19 05:19:20,925 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-19 05:19:20,925 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-19 05:19:20,926 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 05:19:20" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-19 05:19:20,987 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-19 05:19:20,987 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-19 05:19:20,987 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-19 05:19:20,987 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-19 05:19:20,988 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-19 05:19:20,988 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-19 05:19:20,988 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-19 05:19:20,988 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-19 05:19:20,988 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-19 05:19:21,143 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-19 05:19:21,144 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-19 05:19:21,147 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 05:19:21 BoogieIcfgContainer [2020-08-19 05:19:21,147 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-19 05:19:21,148 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-19 05:19:21,148 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-19 05:19:21,151 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-19 05:19:21,151 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.08 05:19:20" (1/3) ... [2020-08-19 05:19:21,152 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5d98cb1f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 05:19:21, skipping insertion in model container [2020-08-19 05:19:21,152 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 05:19:20" (2/3) ... [2020-08-19 05:19:21,153 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5d98cb1f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 05:19:21, skipping insertion in model container [2020-08-19 05:19:21,153 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 05:19:21" (3/3) ... [2020-08-19 05:19:21,154 INFO L109 eAbstractionObserver]: Analyzing ICFG simple_4-2.c [2020-08-19 05:19:21,164 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-19 05:19:21,171 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-19 05:19:21,184 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-19 05:19:21,207 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-19 05:19:21,207 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-19 05:19:21,207 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-19 05:19:21,208 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-19 05:19:21,208 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-19 05:19:21,208 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-19 05:19:21,208 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-19 05:19:21,208 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-19 05:19:21,222 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2020-08-19 05:19:21,227 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-19 05:19:21,227 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:21,228 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:21,228 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:21,233 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:21,233 INFO L82 PathProgramCache]: Analyzing trace with hash 1846144830, now seen corresponding path program 1 times [2020-08-19 05:19:21,239 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:21,240 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1100876864] [2020-08-19 05:19:21,240 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:21,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:21,505 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 12 DAG size of output: 8 [2020-08-19 05:19:21,507 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:21,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:21,512 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:21,513 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1100876864] [2020-08-19 05:19:21,515 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 05:19:21,515 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-19 05:19:21,516 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [328142126] [2020-08-19 05:19:21,522 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-19 05:19:21,523 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:21,537 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-19 05:19:21,538 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-19 05:19:21,540 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 3 states. [2020-08-19 05:19:21,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:21,574 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-08-19 05:19:21,575 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-19 05:19:21,576 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-08-19 05:19:21,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:21,584 INFO L225 Difference]: With dead ends: 29 [2020-08-19 05:19:21,585 INFO L226 Difference]: Without dead ends: 12 [2020-08-19 05:19:21,588 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-19 05:19:21,608 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-08-19 05:19:21,624 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-08-19 05:19:21,625 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-08-19 05:19:21,626 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2020-08-19 05:19:21,627 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2020-08-19 05:19:21,628 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:21,628 INFO L479 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2020-08-19 05:19:21,628 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-19 05:19:21,629 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2020-08-19 05:19:21,629 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-08-19 05:19:21,629 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:21,630 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:21,630 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-19 05:19:21,630 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:21,631 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:21,631 INFO L82 PathProgramCache]: Analyzing trace with hash 1432376145, now seen corresponding path program 1 times [2020-08-19 05:19:21,631 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:21,632 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1198798235] [2020-08-19 05:19:21,632 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:21,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:21,739 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:21,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:21,744 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:21,744 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1198798235] [2020-08-19 05:19:21,745 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:21,745 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-08-19 05:19:21,745 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1529003401] [2020-08-19 05:19:21,747 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-19 05:19:21,748 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:21,748 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-19 05:19:21,748 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-19 05:19:21,748 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 4 states. [2020-08-19 05:19:21,770 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:21,770 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2020-08-19 05:19:21,771 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-19 05:19:21,771 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 11 [2020-08-19 05:19:21,771 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:21,772 INFO L225 Difference]: With dead ends: 18 [2020-08-19 05:19:21,772 INFO L226 Difference]: Without dead ends: 13 [2020-08-19 05:19:21,773 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-19 05:19:21,774 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-08-19 05:19:21,777 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-08-19 05:19:21,777 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-08-19 05:19:21,778 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2020-08-19 05:19:21,778 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2020-08-19 05:19:21,778 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:21,779 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2020-08-19 05:19:21,779 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-19 05:19:21,779 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2020-08-19 05:19:21,780 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-19 05:19:21,780 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:21,780 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:21,780 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-19 05:19:21,781 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:21,781 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:21,781 INFO L82 PathProgramCache]: Analyzing trace with hash 1490448798, now seen corresponding path program 2 times [2020-08-19 05:19:21,781 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:21,782 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [319660358] [2020-08-19 05:19:21,782 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:21,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:21,877 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:21,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:21,881 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:21,882 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [319660358] [2020-08-19 05:19:21,882 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:21,882 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-19 05:19:21,883 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [336076466] [2020-08-19 05:19:21,883 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-19 05:19:21,883 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:21,884 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-19 05:19:21,884 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-19 05:19:21,884 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 5 states. [2020-08-19 05:19:21,909 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:21,909 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2020-08-19 05:19:21,910 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-19 05:19:21,910 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2020-08-19 05:19:21,911 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:21,911 INFO L225 Difference]: With dead ends: 19 [2020-08-19 05:19:21,911 INFO L226 Difference]: Without dead ends: 14 [2020-08-19 05:19:21,912 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-19 05:19:21,913 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-08-19 05:19:21,916 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-08-19 05:19:21,917 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-08-19 05:19:21,917 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-08-19 05:19:21,918 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-08-19 05:19:21,918 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:21,918 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-08-19 05:19:21,918 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-19 05:19:21,918 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-08-19 05:19:21,919 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-19 05:19:21,919 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:21,919 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:21,920 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-19 05:19:21,920 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:21,920 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:21,920 INFO L82 PathProgramCache]: Analyzing trace with hash -1004266255, now seen corresponding path program 3 times [2020-08-19 05:19:21,921 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:21,921 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1114330289] [2020-08-19 05:19:21,921 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:21,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:22,042 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:22,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:22,046 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:22,046 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1114330289] [2020-08-19 05:19:22,047 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:22,047 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-19 05:19:22,047 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1818750804] [2020-08-19 05:19:22,048 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-19 05:19:22,048 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:22,048 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-19 05:19:22,048 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-19 05:19:22,049 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 6 states. [2020-08-19 05:19:22,098 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:22,100 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2020-08-19 05:19:22,101 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-19 05:19:22,101 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 13 [2020-08-19 05:19:22,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:22,102 INFO L225 Difference]: With dead ends: 20 [2020-08-19 05:19:22,102 INFO L226 Difference]: Without dead ends: 15 [2020-08-19 05:19:22,103 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-19 05:19:22,103 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-19 05:19:22,110 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-19 05:19:22,111 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-19 05:19:22,111 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-08-19 05:19:22,112 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2020-08-19 05:19:22,112 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:22,112 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-08-19 05:19:22,112 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-19 05:19:22,112 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-08-19 05:19:22,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-19 05:19:22,116 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:22,116 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:22,117 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-19 05:19:22,117 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:22,117 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:22,117 INFO L82 PathProgramCache]: Analyzing trace with hash -1031021570, now seen corresponding path program 4 times [2020-08-19 05:19:22,118 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:22,118 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1866990302] [2020-08-19 05:19:22,118 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:22,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:22,289 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:22,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:22,292 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:22,293 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1866990302] [2020-08-19 05:19:22,293 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:22,293 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-19 05:19:22,294 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [601847189] [2020-08-19 05:19:22,294 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-19 05:19:22,295 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:22,295 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-19 05:19:22,295 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-19 05:19:22,295 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 7 states. [2020-08-19 05:19:22,333 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:22,333 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2020-08-19 05:19:22,333 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-19 05:19:22,334 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 14 [2020-08-19 05:19:22,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:22,335 INFO L225 Difference]: With dead ends: 21 [2020-08-19 05:19:22,335 INFO L226 Difference]: Without dead ends: 16 [2020-08-19 05:19:22,336 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-19 05:19:22,336 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-19 05:19:22,340 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-19 05:19:22,340 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-19 05:19:22,341 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2020-08-19 05:19:22,341 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2020-08-19 05:19:22,342 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:22,342 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2020-08-19 05:19:22,342 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-19 05:19:22,342 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2020-08-19 05:19:22,343 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-19 05:19:22,343 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:22,343 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:22,344 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-19 05:19:22,344 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:22,344 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:22,344 INFO L82 PathProgramCache]: Analyzing trace with hash -1860436335, now seen corresponding path program 5 times [2020-08-19 05:19:22,345 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:22,345 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1175614960] [2020-08-19 05:19:22,345 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:22,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:22,491 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:22,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:22,494 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:22,495 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1175614960] [2020-08-19 05:19:22,495 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:22,495 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-19 05:19:22,495 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1237015207] [2020-08-19 05:19:22,496 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-19 05:19:22,496 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:22,496 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-19 05:19:22,497 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-08-19 05:19:22,497 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 8 states. [2020-08-19 05:19:22,539 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:22,540 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2020-08-19 05:19:22,540 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-19 05:19:22,540 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 15 [2020-08-19 05:19:22,541 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:22,541 INFO L225 Difference]: With dead ends: 22 [2020-08-19 05:19:22,541 INFO L226 Difference]: Without dead ends: 17 [2020-08-19 05:19:22,542 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-08-19 05:19:22,542 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-19 05:19:22,546 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-19 05:19:22,546 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-19 05:19:22,547 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-19 05:19:22,547 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2020-08-19 05:19:22,547 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:22,548 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-19 05:19:22,548 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-19 05:19:22,548 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-19 05:19:22,548 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-19 05:19:22,548 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:22,549 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:22,549 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-19 05:19:22,549 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:22,549 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:22,550 INFO L82 PathProgramCache]: Analyzing trace with hash -1802490274, now seen corresponding path program 6 times [2020-08-19 05:19:22,550 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:22,550 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [806377777] [2020-08-19 05:19:22,550 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:22,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:22,684 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:22,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:22,687 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:22,687 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [806377777] [2020-08-19 05:19:22,688 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:22,688 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-19 05:19:22,688 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1060293462] [2020-08-19 05:19:22,688 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-19 05:19:22,689 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:22,689 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-19 05:19:22,690 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-19 05:19:22,690 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 9 states. [2020-08-19 05:19:22,742 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:22,742 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2020-08-19 05:19:22,743 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-19 05:19:22,743 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 16 [2020-08-19 05:19:22,743 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:22,744 INFO L225 Difference]: With dead ends: 23 [2020-08-19 05:19:22,744 INFO L226 Difference]: Without dead ends: 18 [2020-08-19 05:19:22,745 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-19 05:19:22,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-19 05:19:22,749 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-08-19 05:19:22,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-19 05:19:22,750 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2020-08-19 05:19:22,750 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 16 [2020-08-19 05:19:22,750 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:22,750 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2020-08-19 05:19:22,750 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-19 05:19:22,751 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2020-08-19 05:19:22,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-19 05:19:22,751 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:22,751 INFO L422 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:22,752 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-19 05:19:22,752 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:22,752 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:22,752 INFO L82 PathProgramCache]: Analyzing trace with hash -6162383, now seen corresponding path program 7 times [2020-08-19 05:19:22,753 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:22,753 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [286394180] [2020-08-19 05:19:22,753 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:22,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:22,930 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:22,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:22,935 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:22,935 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [286394180] [2020-08-19 05:19:22,935 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:22,935 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-19 05:19:22,935 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1214081371] [2020-08-19 05:19:22,936 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-19 05:19:22,936 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:22,936 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-19 05:19:22,936 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-08-19 05:19:22,937 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 10 states. [2020-08-19 05:19:22,998 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:22,998 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2020-08-19 05:19:22,999 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-19 05:19:22,999 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 17 [2020-08-19 05:19:22,999 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:23,000 INFO L225 Difference]: With dead ends: 24 [2020-08-19 05:19:23,000 INFO L226 Difference]: Without dead ends: 19 [2020-08-19 05:19:23,001 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-08-19 05:19:23,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-08-19 05:19:23,005 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-08-19 05:19:23,005 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-19 05:19:23,006 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2020-08-19 05:19:23,006 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 17 [2020-08-19 05:19:23,006 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:23,006 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2020-08-19 05:19:23,007 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-19 05:19:23,007 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2020-08-19 05:19:23,007 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-19 05:19:23,007 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:23,008 INFO L422 BasicCegarLoop]: trace histogram [8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:23,008 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-19 05:19:23,008 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:23,008 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:23,008 INFO L82 PathProgramCache]: Analyzing trace with hash -154572610, now seen corresponding path program 8 times [2020-08-19 05:19:23,009 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:23,009 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [80307500] [2020-08-19 05:19:23,009 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:23,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:23,202 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:23,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:23,207 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:23,208 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [80307500] [2020-08-19 05:19:23,208 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:23,208 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-19 05:19:23,208 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1721383055] [2020-08-19 05:19:23,209 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-19 05:19:23,209 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:23,209 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-19 05:19:23,212 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-08-19 05:19:23,212 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 11 states. [2020-08-19 05:19:23,294 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:23,294 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2020-08-19 05:19:23,296 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-19 05:19:23,296 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 18 [2020-08-19 05:19:23,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:23,297 INFO L225 Difference]: With dead ends: 25 [2020-08-19 05:19:23,297 INFO L226 Difference]: Without dead ends: 20 [2020-08-19 05:19:23,299 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-08-19 05:19:23,299 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-19 05:19:23,305 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-19 05:19:23,305 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-19 05:19:23,309 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2020-08-19 05:19:23,309 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 18 [2020-08-19 05:19:23,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:23,310 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2020-08-19 05:19:23,310 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-19 05:19:23,310 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2020-08-19 05:19:23,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-19 05:19:23,311 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:23,311 INFO L422 BasicCegarLoop]: trace histogram [9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:23,311 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-19 05:19:23,311 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:23,313 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:23,313 INFO L82 PathProgramCache]: Analyzing trace with hash -460322351, now seen corresponding path program 9 times [2020-08-19 05:19:23,313 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:23,314 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2058524351] [2020-08-19 05:19:23,315 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:23,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:23,549 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:23,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:23,553 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:23,555 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2058524351] [2020-08-19 05:19:23,555 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:23,556 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-19 05:19:23,556 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1050456776] [2020-08-19 05:19:23,556 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-19 05:19:23,557 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:23,557 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-19 05:19:23,557 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-08-19 05:19:23,558 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 12 states. [2020-08-19 05:19:23,657 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:23,657 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-08-19 05:19:23,658 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-19 05:19:23,658 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 19 [2020-08-19 05:19:23,658 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:23,659 INFO L225 Difference]: With dead ends: 26 [2020-08-19 05:19:23,659 INFO L226 Difference]: Without dead ends: 21 [2020-08-19 05:19:23,660 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-08-19 05:19:23,660 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-19 05:19:23,663 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-19 05:19:23,664 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-19 05:19:23,664 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2020-08-19 05:19:23,664 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 19 [2020-08-19 05:19:23,665 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:23,665 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2020-08-19 05:19:23,665 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-19 05:19:23,665 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2020-08-19 05:19:23,666 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-19 05:19:23,666 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:23,666 INFO L422 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:23,666 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-19 05:19:23,666 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:23,666 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:23,667 INFO L82 PathProgramCache]: Analyzing trace with hash -1348629730, now seen corresponding path program 10 times [2020-08-19 05:19:23,667 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:23,667 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1764915437] [2020-08-19 05:19:23,667 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:23,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:23,843 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:23,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:23,845 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:23,846 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1764915437] [2020-08-19 05:19:23,846 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:23,846 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-19 05:19:23,846 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [937113185] [2020-08-19 05:19:23,847 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-19 05:19:23,847 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:23,847 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-19 05:19:23,847 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-08-19 05:19:23,847 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 13 states. [2020-08-19 05:19:23,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:23,936 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2020-08-19 05:19:23,937 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-19 05:19:23,937 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 20 [2020-08-19 05:19:23,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:23,938 INFO L225 Difference]: With dead ends: 27 [2020-08-19 05:19:23,938 INFO L226 Difference]: Without dead ends: 22 [2020-08-19 05:19:23,938 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-08-19 05:19:23,939 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-19 05:19:23,942 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-08-19 05:19:23,942 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-19 05:19:23,943 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2020-08-19 05:19:23,943 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 20 [2020-08-19 05:19:23,944 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:23,944 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2020-08-19 05:19:23,944 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-19 05:19:23,944 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2020-08-19 05:19:23,945 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-19 05:19:23,945 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:23,945 INFO L422 BasicCegarLoop]: trace histogram [11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:23,945 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-19 05:19:23,945 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:23,945 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:23,946 INFO L82 PathProgramCache]: Analyzing trace with hash 1178612593, now seen corresponding path program 11 times [2020-08-19 05:19:23,946 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:23,946 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [210988181] [2020-08-19 05:19:23,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:23,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:24,124 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:24,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:24,127 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:24,127 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [210988181] [2020-08-19 05:19:24,127 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:24,127 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-19 05:19:24,128 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [777767911] [2020-08-19 05:19:24,128 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-19 05:19:24,128 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:24,129 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-19 05:19:24,129 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-08-19 05:19:24,129 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 14 states. [2020-08-19 05:19:24,236 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:24,237 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2020-08-19 05:19:24,237 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-19 05:19:24,237 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 21 [2020-08-19 05:19:24,237 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:24,238 INFO L225 Difference]: With dead ends: 28 [2020-08-19 05:19:24,238 INFO L226 Difference]: Without dead ends: 23 [2020-08-19 05:19:24,239 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-08-19 05:19:24,239 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-19 05:19:24,242 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-08-19 05:19:24,242 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-19 05:19:24,243 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-08-19 05:19:24,243 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 21 [2020-08-19 05:19:24,243 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:24,244 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-08-19 05:19:24,244 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-19 05:19:24,244 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-08-19 05:19:24,244 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-19 05:19:24,245 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:24,245 INFO L422 BasicCegarLoop]: trace histogram [12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:24,245 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-19 05:19:24,245 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:24,245 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:24,246 INFO L82 PathProgramCache]: Analyzing trace with hash -2081254018, now seen corresponding path program 12 times [2020-08-19 05:19:24,246 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:24,246 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [48918382] [2020-08-19 05:19:24,246 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:24,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:24,478 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:24,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:24,480 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:24,481 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [48918382] [2020-08-19 05:19:24,481 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:24,481 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-19 05:19:24,481 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [165323854] [2020-08-19 05:19:24,482 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-19 05:19:24,482 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:24,482 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-19 05:19:24,483 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-08-19 05:19:24,483 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 15 states. [2020-08-19 05:19:24,612 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:24,612 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2020-08-19 05:19:24,613 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-19 05:19:24,613 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 22 [2020-08-19 05:19:24,613 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:24,614 INFO L225 Difference]: With dead ends: 29 [2020-08-19 05:19:24,614 INFO L226 Difference]: Without dead ends: 24 [2020-08-19 05:19:24,615 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-08-19 05:19:24,615 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-19 05:19:24,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-08-19 05:19:24,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-19 05:19:24,619 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2020-08-19 05:19:24,619 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 22 [2020-08-19 05:19:24,620 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:24,620 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2020-08-19 05:19:24,620 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-19 05:19:24,620 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2020-08-19 05:19:24,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-08-19 05:19:24,621 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:24,621 INFO L422 BasicCegarLoop]: trace histogram [13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:24,622 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-19 05:19:24,622 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:24,622 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:24,622 INFO L82 PathProgramCache]: Analyzing trace with hash -57903855, now seen corresponding path program 13 times [2020-08-19 05:19:24,623 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:24,623 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1534948240] [2020-08-19 05:19:24,623 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:24,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:24,849 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:24,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:24,852 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:24,853 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1534948240] [2020-08-19 05:19:24,853 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:24,853 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-19 05:19:24,853 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [543517934] [2020-08-19 05:19:24,854 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-19 05:19:24,854 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:24,854 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-19 05:19:24,854 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2020-08-19 05:19:24,855 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 16 states. [2020-08-19 05:19:24,985 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:24,985 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2020-08-19 05:19:24,987 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-19 05:19:24,987 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 23 [2020-08-19 05:19:24,987 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:24,988 INFO L225 Difference]: With dead ends: 30 [2020-08-19 05:19:24,988 INFO L226 Difference]: Without dead ends: 25 [2020-08-19 05:19:24,989 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2020-08-19 05:19:24,989 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-19 05:19:24,994 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-08-19 05:19:24,994 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-19 05:19:24,994 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2020-08-19 05:19:24,995 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 23 [2020-08-19 05:19:24,995 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:24,995 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2020-08-19 05:19:24,995 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-19 05:19:24,995 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2020-08-19 05:19:24,996 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-19 05:19:24,996 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:24,996 INFO L422 BasicCegarLoop]: trace histogram [14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:24,996 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-19 05:19:24,997 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:24,997 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:24,997 INFO L82 PathProgramCache]: Analyzing trace with hash -1758558242, now seen corresponding path program 14 times [2020-08-19 05:19:24,997 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:24,997 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1287286305] [2020-08-19 05:19:24,998 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:25,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:25,256 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:25,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:25,259 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:25,259 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1287286305] [2020-08-19 05:19:25,260 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:25,261 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-19 05:19:25,261 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1860008392] [2020-08-19 05:19:25,262 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-19 05:19:25,262 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:25,262 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-19 05:19:25,263 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-08-19 05:19:25,263 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 17 states. [2020-08-19 05:19:25,409 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:25,409 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2020-08-19 05:19:25,410 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-19 05:19:25,410 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 24 [2020-08-19 05:19:25,410 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:25,411 INFO L225 Difference]: With dead ends: 31 [2020-08-19 05:19:25,411 INFO L226 Difference]: Without dead ends: 26 [2020-08-19 05:19:25,411 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-08-19 05:19:25,412 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-19 05:19:25,417 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-08-19 05:19:25,417 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-19 05:19:25,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2020-08-19 05:19:25,419 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 24 [2020-08-19 05:19:25,422 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:25,422 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2020-08-19 05:19:25,422 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-19 05:19:25,422 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2020-08-19 05:19:25,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-19 05:19:25,426 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:25,426 INFO L422 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:25,427 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-19 05:19:25,427 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:25,427 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:25,427 INFO L82 PathProgramCache]: Analyzing trace with hash 1355730609, now seen corresponding path program 15 times [2020-08-19 05:19:25,427 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:25,428 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [548890355] [2020-08-19 05:19:25,428 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:25,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:25,731 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:25,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:25,737 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:25,737 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [548890355] [2020-08-19 05:19:25,737 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:25,738 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-19 05:19:25,740 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1527990345] [2020-08-19 05:19:25,740 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-19 05:19:25,740 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:25,742 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-19 05:19:25,742 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2020-08-19 05:19:25,742 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 18 states. [2020-08-19 05:19:25,903 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:25,903 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-08-19 05:19:25,904 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-19 05:19:25,904 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 25 [2020-08-19 05:19:25,905 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:25,905 INFO L225 Difference]: With dead ends: 32 [2020-08-19 05:19:25,905 INFO L226 Difference]: Without dead ends: 27 [2020-08-19 05:19:25,906 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2020-08-19 05:19:25,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-08-19 05:19:25,910 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-08-19 05:19:25,910 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-19 05:19:25,911 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2020-08-19 05:19:25,911 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 25 [2020-08-19 05:19:25,911 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:25,912 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2020-08-19 05:19:25,912 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-19 05:19:25,912 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2020-08-19 05:19:25,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-19 05:19:25,914 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:25,914 INFO L422 BasicCegarLoop]: trace histogram [16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:25,914 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-19 05:19:25,915 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:25,915 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:25,915 INFO L82 PathProgramCache]: Analyzing trace with hash -885562818, now seen corresponding path program 16 times [2020-08-19 05:19:25,915 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:25,915 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [694576271] [2020-08-19 05:19:25,915 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:25,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:26,248 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:26,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:26,254 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:26,254 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [694576271] [2020-08-19 05:19:26,255 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:26,255 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-19 05:19:26,255 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2067696113] [2020-08-19 05:19:26,256 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-19 05:19:26,256 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:26,257 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-19 05:19:26,258 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-08-19 05:19:26,258 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 19 states. [2020-08-19 05:19:26,453 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:26,453 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2020-08-19 05:19:26,456 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-19 05:19:26,456 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 26 [2020-08-19 05:19:26,456 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:26,457 INFO L225 Difference]: With dead ends: 33 [2020-08-19 05:19:26,457 INFO L226 Difference]: Without dead ends: 28 [2020-08-19 05:19:26,457 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-08-19 05:19:26,460 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-19 05:19:26,466 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-08-19 05:19:26,467 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-19 05:19:26,467 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2020-08-19 05:19:26,467 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 26 [2020-08-19 05:19:26,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:26,468 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2020-08-19 05:19:26,468 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-19 05:19:26,469 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2020-08-19 05:19:26,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-19 05:19:26,469 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:26,469 INFO L422 BasicCegarLoop]: trace histogram [17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:26,469 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-19 05:19:26,470 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:26,470 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:26,470 INFO L82 PathProgramCache]: Analyzing trace with hash -1646182319, now seen corresponding path program 17 times [2020-08-19 05:19:26,471 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:26,471 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1911655073] [2020-08-19 05:19:26,471 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:26,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:26,841 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:26,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:26,844 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:26,844 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1911655073] [2020-08-19 05:19:26,844 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:26,845 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-19 05:19:26,845 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1757227185] [2020-08-19 05:19:26,847 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-19 05:19:26,847 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:26,847 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-19 05:19:26,847 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2020-08-19 05:19:26,853 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 20 states. [2020-08-19 05:19:27,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:27,087 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2020-08-19 05:19:27,087 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-19 05:19:27,087 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 27 [2020-08-19 05:19:27,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:27,088 INFO L225 Difference]: With dead ends: 34 [2020-08-19 05:19:27,088 INFO L226 Difference]: Without dead ends: 29 [2020-08-19 05:19:27,089 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2020-08-19 05:19:27,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-19 05:19:27,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-08-19 05:19:27,095 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-19 05:19:27,097 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-08-19 05:19:27,097 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 27 [2020-08-19 05:19:27,097 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:27,097 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-08-19 05:19:27,097 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-19 05:19:27,098 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-08-19 05:19:27,099 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-19 05:19:27,099 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:27,099 INFO L422 BasicCegarLoop]: trace histogram [18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:27,099 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-19 05:19:27,100 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:27,100 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:27,100 INFO L82 PathProgramCache]: Analyzing trace with hash 544416926, now seen corresponding path program 18 times [2020-08-19 05:19:27,100 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:27,101 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1597027622] [2020-08-19 05:19:27,101 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:27,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:27,479 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:27,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:27,483 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:27,483 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1597027622] [2020-08-19 05:19:27,483 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:27,483 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-19 05:19:27,484 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1009844900] [2020-08-19 05:19:27,484 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-19 05:19:27,484 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:27,484 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-19 05:19:27,485 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2020-08-19 05:19:27,485 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 21 states. [2020-08-19 05:19:27,731 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:27,731 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2020-08-19 05:19:27,731 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-19 05:19:27,732 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 28 [2020-08-19 05:19:27,732 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:27,732 INFO L225 Difference]: With dead ends: 35 [2020-08-19 05:19:27,732 INFO L226 Difference]: Without dead ends: 30 [2020-08-19 05:19:27,733 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2020-08-19 05:19:27,733 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-19 05:19:27,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-08-19 05:19:27,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-19 05:19:27,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2020-08-19 05:19:27,738 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 28 [2020-08-19 05:19:27,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:27,738 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2020-08-19 05:19:27,738 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-19 05:19:27,739 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2020-08-19 05:19:27,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-19 05:19:27,739 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:27,739 INFO L422 BasicCegarLoop]: trace histogram [19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:27,740 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-19 05:19:27,740 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:27,740 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:27,740 INFO L82 PathProgramCache]: Analyzing trace with hash -266483215, now seen corresponding path program 19 times [2020-08-19 05:19:27,740 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:27,741 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1226325591] [2020-08-19 05:19:27,741 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:27,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:28,133 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:28,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:28,136 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:28,136 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1226325591] [2020-08-19 05:19:28,137 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:28,137 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-19 05:19:28,137 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [371823030] [2020-08-19 05:19:28,137 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-19 05:19:28,137 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:28,138 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-19 05:19:28,138 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2020-08-19 05:19:28,138 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 22 states. [2020-08-19 05:19:28,406 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:28,407 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2020-08-19 05:19:28,407 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-19 05:19:28,407 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 29 [2020-08-19 05:19:28,408 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:28,408 INFO L225 Difference]: With dead ends: 36 [2020-08-19 05:19:28,408 INFO L226 Difference]: Without dead ends: 31 [2020-08-19 05:19:28,409 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2020-08-19 05:19:28,409 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-19 05:19:28,413 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-08-19 05:19:28,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-19 05:19:28,413 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2020-08-19 05:19:28,413 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 29 [2020-08-19 05:19:28,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:28,414 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2020-08-19 05:19:28,414 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-19 05:19:28,414 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2020-08-19 05:19:28,414 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-19 05:19:28,415 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:28,415 INFO L422 BasicCegarLoop]: trace histogram [20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:28,415 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-19 05:19:28,415 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:28,415 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:28,415 INFO L82 PathProgramCache]: Analyzing trace with hash 365416190, now seen corresponding path program 20 times [2020-08-19 05:19:28,416 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:28,416 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1903110881] [2020-08-19 05:19:28,416 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:28,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:28,903 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:28,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:28,907 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:28,908 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1903110881] [2020-08-19 05:19:28,908 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:28,908 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-19 05:19:28,908 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1662404947] [2020-08-19 05:19:28,910 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-19 05:19:28,910 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:28,910 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-19 05:19:28,910 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2020-08-19 05:19:28,911 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 23 states. [2020-08-19 05:19:29,190 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:29,191 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2020-08-19 05:19:29,191 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-19 05:19:29,191 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 30 [2020-08-19 05:19:29,191 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:29,192 INFO L225 Difference]: With dead ends: 37 [2020-08-19 05:19:29,192 INFO L226 Difference]: Without dead ends: 32 [2020-08-19 05:19:29,192 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2020-08-19 05:19:29,194 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-19 05:19:29,198 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-08-19 05:19:29,198 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-19 05:19:29,199 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2020-08-19 05:19:29,199 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 30 [2020-08-19 05:19:29,199 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:29,199 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2020-08-19 05:19:29,199 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-19 05:19:29,199 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2020-08-19 05:19:29,200 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-19 05:19:29,200 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:29,200 INFO L422 BasicCegarLoop]: trace histogram [21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:29,200 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-19 05:19:29,201 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:29,201 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:29,201 INFO L82 PathProgramCache]: Analyzing trace with hash -1520538735, now seen corresponding path program 21 times [2020-08-19 05:19:29,201 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:29,201 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [368318874] [2020-08-19 05:19:29,202 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:29,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:29,619 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:29,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:29,623 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:29,623 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [368318874] [2020-08-19 05:19:29,623 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:29,624 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-19 05:19:29,624 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1436330725] [2020-08-19 05:19:29,625 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-19 05:19:29,625 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:29,625 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-19 05:19:29,626 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2020-08-19 05:19:29,626 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 24 states. [2020-08-19 05:19:29,947 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:29,947 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-08-19 05:19:29,950 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-19 05:19:29,950 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 31 [2020-08-19 05:19:29,950 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:29,951 INFO L225 Difference]: With dead ends: 38 [2020-08-19 05:19:29,951 INFO L226 Difference]: Without dead ends: 33 [2020-08-19 05:19:29,954 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2020-08-19 05:19:29,954 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-19 05:19:29,961 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-08-19 05:19:29,961 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-19 05:19:29,962 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2020-08-19 05:19:29,962 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 31 [2020-08-19 05:19:29,962 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:29,962 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2020-08-19 05:19:29,962 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-19 05:19:29,963 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2020-08-19 05:19:29,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-19 05:19:29,963 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:29,963 INFO L422 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:29,963 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-19 05:19:29,964 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:29,964 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:29,964 INFO L82 PathProgramCache]: Analyzing trace with hash 144400734, now seen corresponding path program 22 times [2020-08-19 05:19:29,964 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:29,964 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1576785772] [2020-08-19 05:19:29,965 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:29,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:30,418 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:30,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:30,422 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:30,422 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1576785772] [2020-08-19 05:19:30,422 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:30,422 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-19 05:19:30,423 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [616949789] [2020-08-19 05:19:30,423 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-19 05:19:30,423 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:30,423 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-19 05:19:30,424 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2020-08-19 05:19:30,424 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 25 states. [2020-08-19 05:19:30,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:30,752 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2020-08-19 05:19:30,752 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-19 05:19:30,752 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 32 [2020-08-19 05:19:30,753 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:30,753 INFO L225 Difference]: With dead ends: 39 [2020-08-19 05:19:30,753 INFO L226 Difference]: Without dead ends: 34 [2020-08-19 05:19:30,754 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2020-08-19 05:19:30,754 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-19 05:19:30,758 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-08-19 05:19:30,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-19 05:19:30,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2020-08-19 05:19:30,759 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 32 [2020-08-19 05:19:30,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:30,760 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2020-08-19 05:19:30,760 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-19 05:19:30,760 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2020-08-19 05:19:30,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-19 05:19:30,761 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:30,761 INFO L422 BasicCegarLoop]: trace histogram [23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:30,761 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-19 05:19:30,761 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:30,761 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:30,762 INFO L82 PathProgramCache]: Analyzing trace with hash 217916721, now seen corresponding path program 23 times [2020-08-19 05:19:30,762 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:30,762 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [676500515] [2020-08-19 05:19:30,762 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:30,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:31,285 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:31,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:31,290 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:31,290 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [676500515] [2020-08-19 05:19:31,290 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:31,290 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-19 05:19:31,290 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [627096518] [2020-08-19 05:19:31,291 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-19 05:19:31,291 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:31,291 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-19 05:19:31,291 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2020-08-19 05:19:31,291 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 26 states. [2020-08-19 05:19:31,671 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:31,671 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2020-08-19 05:19:31,671 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-19 05:19:31,672 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 33 [2020-08-19 05:19:31,672 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:31,672 INFO L225 Difference]: With dead ends: 40 [2020-08-19 05:19:31,673 INFO L226 Difference]: Without dead ends: 35 [2020-08-19 05:19:31,673 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2020-08-19 05:19:31,673 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-19 05:19:31,677 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-08-19 05:19:31,678 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-19 05:19:31,678 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-08-19 05:19:31,678 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 33 [2020-08-19 05:19:31,679 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:31,679 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-08-19 05:19:31,679 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-19 05:19:31,679 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-08-19 05:19:31,679 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-19 05:19:31,679 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:31,680 INFO L422 BasicCegarLoop]: trace histogram [24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:31,680 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-19 05:19:31,680 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:31,680 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:31,680 INFO L82 PathProgramCache]: Analyzing trace with hash -1798054978, now seen corresponding path program 24 times [2020-08-19 05:19:31,681 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:31,681 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [138670352] [2020-08-19 05:19:31,681 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:31,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:32,309 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:32,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:32,319 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:32,319 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [138670352] [2020-08-19 05:19:32,319 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:32,320 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-19 05:19:32,320 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [717699941] [2020-08-19 05:19:32,320 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-19 05:19:32,320 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:32,322 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-19 05:19:32,323 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2020-08-19 05:19:32,323 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 27 states. [2020-08-19 05:19:32,661 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:32,662 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2020-08-19 05:19:32,662 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-19 05:19:32,662 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 34 [2020-08-19 05:19:32,662 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:32,663 INFO L225 Difference]: With dead ends: 41 [2020-08-19 05:19:32,663 INFO L226 Difference]: Without dead ends: 36 [2020-08-19 05:19:32,664 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2020-08-19 05:19:32,664 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-19 05:19:32,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-08-19 05:19:32,668 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-19 05:19:32,669 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2020-08-19 05:19:32,669 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 34 [2020-08-19 05:19:32,669 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:32,669 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2020-08-19 05:19:32,670 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-19 05:19:32,670 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2020-08-19 05:19:32,670 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-19 05:19:32,671 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:32,671 INFO L422 BasicCegarLoop]: trace histogram [25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:32,671 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-19 05:19:32,671 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:32,672 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:32,672 INFO L82 PathProgramCache]: Analyzing trace with hash 131331793, now seen corresponding path program 25 times [2020-08-19 05:19:32,672 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:32,673 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1099079102] [2020-08-19 05:19:32,674 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:32,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:33,224 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:33,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:33,229 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:33,229 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1099079102] [2020-08-19 05:19:33,229 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:33,229 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-19 05:19:33,230 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1594405835] [2020-08-19 05:19:33,232 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-19 05:19:33,232 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:33,233 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-19 05:19:33,233 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2020-08-19 05:19:33,233 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 28 states. [2020-08-19 05:19:33,697 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:33,698 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2020-08-19 05:19:33,698 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-19 05:19:33,698 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 35 [2020-08-19 05:19:33,698 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:33,699 INFO L225 Difference]: With dead ends: 42 [2020-08-19 05:19:33,699 INFO L226 Difference]: Without dead ends: 37 [2020-08-19 05:19:33,700 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2020-08-19 05:19:33,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-19 05:19:33,708 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-08-19 05:19:33,708 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-19 05:19:33,708 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2020-08-19 05:19:33,709 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 35 [2020-08-19 05:19:33,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:33,709 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2020-08-19 05:19:33,710 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-19 05:19:33,710 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2020-08-19 05:19:33,710 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-19 05:19:33,710 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:33,711 INFO L422 BasicCegarLoop]: trace histogram [26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:33,713 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-19 05:19:33,714 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:33,714 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:33,714 INFO L82 PathProgramCache]: Analyzing trace with hash -187220450, now seen corresponding path program 26 times [2020-08-19 05:19:33,714 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:33,714 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1817319628] [2020-08-19 05:19:33,715 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:33,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:34,319 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:34,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:34,323 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:34,324 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1817319628] [2020-08-19 05:19:34,324 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:34,324 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-19 05:19:34,324 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [168163077] [2020-08-19 05:19:34,325 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-19 05:19:34,325 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:34,325 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-19 05:19:34,325 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=731, Unknown=0, NotChecked=0, Total=812 [2020-08-19 05:19:34,326 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 29 states. [2020-08-19 05:19:34,763 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:34,764 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2020-08-19 05:19:34,764 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-19 05:19:34,764 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 36 [2020-08-19 05:19:34,764 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:34,765 INFO L225 Difference]: With dead ends: 43 [2020-08-19 05:19:34,765 INFO L226 Difference]: Without dead ends: 38 [2020-08-19 05:19:34,766 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=81, Invalid=731, Unknown=0, NotChecked=0, Total=812 [2020-08-19 05:19:34,766 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-19 05:19:34,778 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-08-19 05:19:34,779 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-19 05:19:34,779 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2020-08-19 05:19:34,779 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 36 [2020-08-19 05:19:34,779 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:34,780 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2020-08-19 05:19:34,780 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-19 05:19:34,780 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2020-08-19 05:19:34,780 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-19 05:19:34,780 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:34,780 INFO L422 BasicCegarLoop]: trace histogram [27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:34,781 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-19 05:19:34,781 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:34,781 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:34,781 INFO L82 PathProgramCache]: Analyzing trace with hash -1472405391, now seen corresponding path program 27 times [2020-08-19 05:19:34,781 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:34,782 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [450020472] [2020-08-19 05:19:34,782 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:34,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:35,461 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:35,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:35,466 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:35,466 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [450020472] [2020-08-19 05:19:35,466 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:35,466 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-19 05:19:35,467 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [129769430] [2020-08-19 05:19:35,467 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-19 05:19:35,467 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:35,467 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-19 05:19:35,468 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2020-08-19 05:19:35,468 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 30 states. [2020-08-19 05:19:35,988 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:35,988 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-08-19 05:19:35,993 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-19 05:19:35,994 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 37 [2020-08-19 05:19:35,994 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:35,994 INFO L225 Difference]: With dead ends: 44 [2020-08-19 05:19:35,994 INFO L226 Difference]: Without dead ends: 39 [2020-08-19 05:19:35,995 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2020-08-19 05:19:35,995 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-19 05:19:35,998 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-19 05:19:35,998 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-19 05:19:35,998 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2020-08-19 05:19:35,999 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 37 [2020-08-19 05:19:35,999 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:35,999 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2020-08-19 05:19:35,999 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-19 05:19:35,999 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2020-08-19 05:19:36,000 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-19 05:19:36,000 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:36,000 INFO L422 BasicCegarLoop]: trace histogram [28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:36,000 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-19 05:19:36,000 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:36,000 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:36,000 INFO L82 PathProgramCache]: Analyzing trace with hash 1636534398, now seen corresponding path program 28 times [2020-08-19 05:19:36,001 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:36,001 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [721539723] [2020-08-19 05:19:36,001 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:36,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:36,737 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:36,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:36,742 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:36,742 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [721539723] [2020-08-19 05:19:36,743 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:36,743 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-19 05:19:36,743 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [797864705] [2020-08-19 05:19:36,743 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-19 05:19:36,744 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:36,744 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-19 05:19:36,744 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2020-08-19 05:19:36,745 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 31 states. [2020-08-19 05:19:37,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:37,219 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2020-08-19 05:19:37,219 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-19 05:19:37,219 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 38 [2020-08-19 05:19:37,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:37,220 INFO L225 Difference]: With dead ends: 45 [2020-08-19 05:19:37,220 INFO L226 Difference]: Without dead ends: 40 [2020-08-19 05:19:37,221 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2020-08-19 05:19:37,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-19 05:19:37,225 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-08-19 05:19:37,225 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-19 05:19:37,226 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2020-08-19 05:19:37,226 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 38 [2020-08-19 05:19:37,226 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:37,226 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2020-08-19 05:19:37,226 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-19 05:19:37,226 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2020-08-19 05:19:37,227 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-19 05:19:37,227 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:37,227 INFO L422 BasicCegarLoop]: trace histogram [29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:37,227 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-19 05:19:37,227 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:37,228 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:37,228 INFO L82 PathProgramCache]: Analyzing trace with hash -770579951, now seen corresponding path program 29 times [2020-08-19 05:19:37,228 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:37,228 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [296981373] [2020-08-19 05:19:37,228 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:37,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:37,985 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:37,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:37,990 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:37,990 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [296981373] [2020-08-19 05:19:37,990 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:37,990 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-19 05:19:37,990 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [469734974] [2020-08-19 05:19:37,991 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-19 05:19:37,991 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:37,991 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-19 05:19:37,991 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=902, Unknown=0, NotChecked=0, Total=992 [2020-08-19 05:19:37,992 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 32 states. [2020-08-19 05:19:38,553 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:38,553 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2020-08-19 05:19:38,554 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-19 05:19:38,554 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 39 [2020-08-19 05:19:38,554 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:38,555 INFO L225 Difference]: With dead ends: 46 [2020-08-19 05:19:38,555 INFO L226 Difference]: Without dead ends: 41 [2020-08-19 05:19:38,556 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=90, Invalid=902, Unknown=0, NotChecked=0, Total=992 [2020-08-19 05:19:38,557 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-19 05:19:38,560 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-19 05:19:38,560 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-19 05:19:38,560 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-08-19 05:19:38,560 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 39 [2020-08-19 05:19:38,561 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:38,561 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-08-19 05:19:38,561 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-19 05:19:38,561 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-08-19 05:19:38,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-19 05:19:38,562 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:38,562 INFO L422 BasicCegarLoop]: trace histogram [30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:38,562 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-19 05:19:38,562 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:38,562 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:38,562 INFO L82 PathProgramCache]: Analyzing trace with hash 1918286558, now seen corresponding path program 30 times [2020-08-19 05:19:38,563 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:38,563 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [933972032] [2020-08-19 05:19:38,563 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:38,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:39,379 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:39,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:39,384 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:39,384 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [933972032] [2020-08-19 05:19:39,384 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:39,384 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-19 05:19:39,384 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [262170876] [2020-08-19 05:19:39,385 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-19 05:19:39,385 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:39,385 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-19 05:19:39,386 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2020-08-19 05:19:39,386 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 33 states. [2020-08-19 05:19:40,021 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:40,022 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2020-08-19 05:19:40,023 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-19 05:19:40,023 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 40 [2020-08-19 05:19:40,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:40,024 INFO L225 Difference]: With dead ends: 47 [2020-08-19 05:19:40,024 INFO L226 Difference]: Without dead ends: 42 [2020-08-19 05:19:40,024 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2020-08-19 05:19:40,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-19 05:19:40,027 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-08-19 05:19:40,028 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-19 05:19:40,028 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2020-08-19 05:19:40,028 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 40 [2020-08-19 05:19:40,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:40,029 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2020-08-19 05:19:40,029 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-19 05:19:40,029 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2020-08-19 05:19:40,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-19 05:19:40,029 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:40,029 INFO L422 BasicCegarLoop]: trace histogram [31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:40,030 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-19 05:19:40,030 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:40,030 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:40,030 INFO L82 PathProgramCache]: Analyzing trace with hash -626197583, now seen corresponding path program 31 times [2020-08-19 05:19:40,030 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:40,030 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [499873346] [2020-08-19 05:19:40,031 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:40,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:40,848 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:40,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:40,853 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:40,853 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [499873346] [2020-08-19 05:19:40,854 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:40,854 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-19 05:19:40,854 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1874951748] [2020-08-19 05:19:40,854 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-19 05:19:40,854 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:40,855 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-19 05:19:40,855 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2020-08-19 05:19:40,855 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 34 states. [2020-08-19 05:19:41,536 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:41,537 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2020-08-19 05:19:41,537 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-19 05:19:41,537 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 41 [2020-08-19 05:19:41,538 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:41,538 INFO L225 Difference]: With dead ends: 48 [2020-08-19 05:19:41,538 INFO L226 Difference]: Without dead ends: 43 [2020-08-19 05:19:41,539 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2020-08-19 05:19:41,539 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-19 05:19:41,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-19 05:19:41,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-19 05:19:41,542 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2020-08-19 05:19:41,543 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 41 [2020-08-19 05:19:41,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:41,543 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2020-08-19 05:19:41,543 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-19 05:19:41,543 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2020-08-19 05:19:41,544 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-19 05:19:41,544 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:41,544 INFO L422 BasicCegarLoop]: trace histogram [32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:41,544 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-19 05:19:41,544 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:41,544 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:41,545 INFO L82 PathProgramCache]: Analyzing trace with hash 2099172670, now seen corresponding path program 32 times [2020-08-19 05:19:41,545 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:41,545 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1821768707] [2020-08-19 05:19:41,545 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:41,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:42,395 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:42,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:42,400 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:42,400 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1821768707] [2020-08-19 05:19:42,400 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:42,400 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-19 05:19:42,400 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1426867537] [2020-08-19 05:19:42,401 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-19 05:19:42,401 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:42,401 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-19 05:19:42,402 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=1091, Unknown=0, NotChecked=0, Total=1190 [2020-08-19 05:19:42,402 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 35 states. [2020-08-19 05:19:43,160 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:43,160 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2020-08-19 05:19:43,160 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-19 05:19:43,161 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 42 [2020-08-19 05:19:43,161 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:43,161 INFO L225 Difference]: With dead ends: 49 [2020-08-19 05:19:43,162 INFO L226 Difference]: Without dead ends: 44 [2020-08-19 05:19:43,163 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=99, Invalid=1091, Unknown=0, NotChecked=0, Total=1190 [2020-08-19 05:19:43,163 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-19 05:19:43,166 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-08-19 05:19:43,166 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-19 05:19:43,166 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2020-08-19 05:19:43,166 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 42 [2020-08-19 05:19:43,167 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:43,167 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2020-08-19 05:19:43,167 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-19 05:19:43,167 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2020-08-19 05:19:43,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-19 05:19:43,167 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:43,168 INFO L422 BasicCegarLoop]: trace histogram [33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:43,168 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-19 05:19:43,168 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:43,168 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:43,168 INFO L82 PathProgramCache]: Analyzing trace with hash 686304593, now seen corresponding path program 33 times [2020-08-19 05:19:43,168 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:43,169 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [150413577] [2020-08-19 05:19:43,169 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:43,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:44,020 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:44,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:44,025 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:44,026 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [150413577] [2020-08-19 05:19:44,026 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:44,026 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-19 05:19:44,026 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1251328984] [2020-08-19 05:19:44,026 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-19 05:19:44,027 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:44,027 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-19 05:19:44,027 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2020-08-19 05:19:44,028 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 36 states. [2020-08-19 05:19:44,802 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:44,802 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-08-19 05:19:44,803 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-19 05:19:44,803 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 43 [2020-08-19 05:19:44,803 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:44,804 INFO L225 Difference]: With dead ends: 50 [2020-08-19 05:19:44,804 INFO L226 Difference]: Without dead ends: 45 [2020-08-19 05:19:44,804 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2020-08-19 05:19:44,805 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-19 05:19:44,807 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-08-19 05:19:44,807 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-19 05:19:44,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2020-08-19 05:19:44,808 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 43 [2020-08-19 05:19:44,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:44,808 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2020-08-19 05:19:44,808 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-19 05:19:44,808 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2020-08-19 05:19:44,809 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-19 05:19:44,809 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:44,809 INFO L422 BasicCegarLoop]: trace histogram [34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:44,809 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-19 05:19:44,810 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:44,810 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:44,810 INFO L82 PathProgramCache]: Analyzing trace with hash -162932834, now seen corresponding path program 34 times [2020-08-19 05:19:44,810 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:44,810 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [494271603] [2020-08-19 05:19:44,810 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:44,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:45,771 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:45,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:45,777 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:45,777 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [494271603] [2020-08-19 05:19:45,778 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:45,778 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-19 05:19:45,778 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [18549662] [2020-08-19 05:19:45,778 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-19 05:19:45,778 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:45,779 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-19 05:19:45,779 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=1227, Unknown=0, NotChecked=0, Total=1332 [2020-08-19 05:19:45,779 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 37 states. [2020-08-19 05:19:46,599 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:46,600 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2020-08-19 05:19:46,600 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-19 05:19:46,600 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 44 [2020-08-19 05:19:46,601 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:46,601 INFO L225 Difference]: With dead ends: 51 [2020-08-19 05:19:46,601 INFO L226 Difference]: Without dead ends: 46 [2020-08-19 05:19:46,602 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=105, Invalid=1227, Unknown=0, NotChecked=0, Total=1332 [2020-08-19 05:19:46,603 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-19 05:19:46,606 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-08-19 05:19:46,606 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-19 05:19:46,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2020-08-19 05:19:46,606 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 44 [2020-08-19 05:19:46,607 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:46,607 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2020-08-19 05:19:46,607 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-19 05:19:46,607 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2020-08-19 05:19:46,607 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-19 05:19:46,607 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:46,608 INFO L422 BasicCegarLoop]: trace histogram [35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:46,608 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-19 05:19:46,608 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:46,608 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:46,608 INFO L82 PathProgramCache]: Analyzing trace with hash -719489295, now seen corresponding path program 35 times [2020-08-19 05:19:46,608 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:46,609 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [557891205] [2020-08-19 05:19:46,609 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:46,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:47,672 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:47,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:47,677 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:47,677 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [557891205] [2020-08-19 05:19:47,677 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:47,678 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-19 05:19:47,678 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1681750203] [2020-08-19 05:19:47,678 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-19 05:19:47,678 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:47,678 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-19 05:19:47,679 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=1298, Unknown=0, NotChecked=0, Total=1406 [2020-08-19 05:19:47,679 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand 38 states. [2020-08-19 05:19:48,522 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:48,523 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2020-08-19 05:19:48,524 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-19 05:19:48,524 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 45 [2020-08-19 05:19:48,524 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:48,525 INFO L225 Difference]: With dead ends: 52 [2020-08-19 05:19:48,525 INFO L226 Difference]: Without dead ends: 47 [2020-08-19 05:19:48,526 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=108, Invalid=1298, Unknown=0, NotChecked=0, Total=1406 [2020-08-19 05:19:48,526 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-19 05:19:48,528 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-08-19 05:19:48,529 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-19 05:19:48,529 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2020-08-19 05:19:48,529 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 45 [2020-08-19 05:19:48,529 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:48,529 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2020-08-19 05:19:48,529 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-19 05:19:48,529 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2020-08-19 05:19:48,530 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-19 05:19:48,530 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:48,530 INFO L422 BasicCegarLoop]: trace histogram [36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:48,530 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-19 05:19:48,530 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:48,530 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:48,530 INFO L82 PathProgramCache]: Analyzing trace with hash -792870402, now seen corresponding path program 36 times [2020-08-19 05:19:48,531 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:48,531 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2029198396] [2020-08-19 05:19:48,531 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:48,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:49,645 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:49,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:49,650 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:49,650 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2029198396] [2020-08-19 05:19:49,651 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:49,651 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-19 05:19:49,651 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [31929473] [2020-08-19 05:19:49,651 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-19 05:19:49,651 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:49,651 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-19 05:19:49,652 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2020-08-19 05:19:49,652 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 39 states. [2020-08-19 05:19:50,581 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:50,582 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2020-08-19 05:19:50,583 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-19 05:19:50,583 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 46 [2020-08-19 05:19:50,583 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:50,583 INFO L225 Difference]: With dead ends: 53 [2020-08-19 05:19:50,583 INFO L226 Difference]: Without dead ends: 48 [2020-08-19 05:19:50,584 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2020-08-19 05:19:50,584 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-19 05:19:50,587 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-08-19 05:19:50,587 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-19 05:19:50,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2020-08-19 05:19:50,588 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 46 [2020-08-19 05:19:50,588 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:50,588 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2020-08-19 05:19:50,588 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-19 05:19:50,588 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2020-08-19 05:19:50,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-19 05:19:50,589 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:50,589 INFO L422 BasicCegarLoop]: trace histogram [37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:50,589 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-19 05:19:50,589 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:50,590 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:50,590 INFO L82 PathProgramCache]: Analyzing trace with hash 1227282577, now seen corresponding path program 37 times [2020-08-19 05:19:50,590 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:50,590 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [364579900] [2020-08-19 05:19:50,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:50,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:51,723 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:51,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:51,728 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:51,728 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [364579900] [2020-08-19 05:19:51,729 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:51,729 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-19 05:19:51,729 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [162019998] [2020-08-19 05:19:51,729 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-19 05:19:51,729 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:51,730 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-19 05:19:51,730 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=1446, Unknown=0, NotChecked=0, Total=1560 [2020-08-19 05:19:51,730 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 40 states. [2020-08-19 05:19:52,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:52,679 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2020-08-19 05:19:52,680 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-19 05:19:52,680 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 47 [2020-08-19 05:19:52,680 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:52,681 INFO L225 Difference]: With dead ends: 54 [2020-08-19 05:19:52,681 INFO L226 Difference]: Without dead ends: 49 [2020-08-19 05:19:52,682 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=114, Invalid=1446, Unknown=0, NotChecked=0, Total=1560 [2020-08-19 05:19:52,682 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-19 05:19:52,684 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-19 05:19:52,684 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-19 05:19:52,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2020-08-19 05:19:52,685 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 47 [2020-08-19 05:19:52,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:52,685 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2020-08-19 05:19:52,685 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-19 05:19:52,686 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2020-08-19 05:19:52,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-19 05:19:52,686 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:52,686 INFO L422 BasicCegarLoop]: trace histogram [38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:52,686 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-19 05:19:52,686 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:52,687 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:52,687 INFO L82 PathProgramCache]: Analyzing trace with hash -572484514, now seen corresponding path program 38 times [2020-08-19 05:19:52,687 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:52,687 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1110200350] [2020-08-19 05:19:52,687 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:52,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:53,849 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:53,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:53,855 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:53,855 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1110200350] [2020-08-19 05:19:53,855 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:53,856 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-19 05:19:53,856 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [742104182] [2020-08-19 05:19:53,856 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-19 05:19:53,856 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:53,856 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-19 05:19:53,857 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=1523, Unknown=0, NotChecked=0, Total=1640 [2020-08-19 05:19:53,857 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 41 states. [2020-08-19 05:19:54,860 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:54,860 INFO L93 Difference]: Finished difference Result 55 states and 55 transitions. [2020-08-19 05:19:54,861 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-19 05:19:54,861 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 48 [2020-08-19 05:19:54,861 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:54,862 INFO L225 Difference]: With dead ends: 55 [2020-08-19 05:19:54,862 INFO L226 Difference]: Without dead ends: 50 [2020-08-19 05:19:54,864 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=117, Invalid=1523, Unknown=0, NotChecked=0, Total=1640 [2020-08-19 05:19:54,864 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-08-19 05:19:54,867 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2020-08-19 05:19:54,868 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-08-19 05:19:54,868 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2020-08-19 05:19:54,868 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 48 [2020-08-19 05:19:54,869 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:54,869 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2020-08-19 05:19:54,869 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-19 05:19:54,869 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2020-08-19 05:19:54,869 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-08-19 05:19:54,869 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:54,870 INFO L422 BasicCegarLoop]: trace histogram [39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:54,870 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-19 05:19:54,870 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:54,870 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:54,870 INFO L82 PathProgramCache]: Analyzing trace with hash -530689487, now seen corresponding path program 39 times [2020-08-19 05:19:54,870 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:54,871 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1081193383] [2020-08-19 05:19:54,871 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:54,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:56,287 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:56,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:56,293 INFO L134 CoverageAnalysis]: Checked inductivity of 780 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:56,293 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1081193383] [2020-08-19 05:19:56,293 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:56,293 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-19 05:19:56,293 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1369463091] [2020-08-19 05:19:56,294 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-19 05:19:56,294 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:56,294 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-19 05:19:56,295 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=1602, Unknown=0, NotChecked=0, Total=1722 [2020-08-19 05:19:56,295 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand 42 states. [2020-08-19 05:19:57,292 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:57,292 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2020-08-19 05:19:57,293 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-19 05:19:57,293 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 49 [2020-08-19 05:19:57,293 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:57,294 INFO L225 Difference]: With dead ends: 56 [2020-08-19 05:19:57,294 INFO L226 Difference]: Without dead ends: 51 [2020-08-19 05:19:57,295 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=120, Invalid=1602, Unknown=0, NotChecked=0, Total=1722 [2020-08-19 05:19:57,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-08-19 05:19:57,297 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2020-08-19 05:19:57,297 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-19 05:19:57,297 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2020-08-19 05:19:57,297 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 49 [2020-08-19 05:19:57,297 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:57,297 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2020-08-19 05:19:57,297 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-19 05:19:57,298 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2020-08-19 05:19:57,298 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-19 05:19:57,298 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:57,298 INFO L422 BasicCegarLoop]: trace histogram [40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:57,298 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-19 05:19:57,298 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:57,298 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:57,298 INFO L82 PathProgramCache]: Analyzing trace with hash 764956350, now seen corresponding path program 40 times [2020-08-19 05:19:57,299 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:57,299 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1000459027] [2020-08-19 05:19:57,299 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:57,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:58,564 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:58,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:58,569 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 0 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:58,569 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1000459027] [2020-08-19 05:19:58,570 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:58,570 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-19 05:19:58,570 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1709212770] [2020-08-19 05:19:58,570 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-19 05:19:58,570 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:58,570 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-19 05:19:58,571 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=1683, Unknown=0, NotChecked=0, Total=1806 [2020-08-19 05:19:58,571 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 43 states. [2020-08-19 05:19:59,707 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:59,707 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2020-08-19 05:19:59,708 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-19 05:19:59,708 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 50 [2020-08-19 05:19:59,708 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:59,709 INFO L225 Difference]: With dead ends: 57 [2020-08-19 05:19:59,709 INFO L226 Difference]: Without dead ends: 52 [2020-08-19 05:19:59,710 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=123, Invalid=1683, Unknown=0, NotChecked=0, Total=1806 [2020-08-19 05:19:59,710 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-19 05:19:59,714 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2020-08-19 05:19:59,714 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-19 05:19:59,714 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2020-08-19 05:19:59,714 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 50 [2020-08-19 05:19:59,715 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:59,715 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2020-08-19 05:19:59,715 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-19 05:19:59,715 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2020-08-19 05:19:59,715 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-08-19 05:19:59,715 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:59,716 INFO L422 BasicCegarLoop]: trace histogram [41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:59,716 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-19 05:19:59,716 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:59,716 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:59,716 INFO L82 PathProgramCache]: Analyzing trace with hash -2019695663, now seen corresponding path program 41 times [2020-08-19 05:19:59,716 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:59,717 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1041328053] [2020-08-19 05:19:59,717 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:59,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:20:01,032 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:20:01,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:20:01,044 INFO L134 CoverageAnalysis]: Checked inductivity of 861 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:20:01,044 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1041328053] [2020-08-19 05:20:01,044 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:20:01,044 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-08-19 05:20:01,044 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [520976165] [2020-08-19 05:20:01,045 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-08-19 05:20:01,045 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:20:01,045 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-08-19 05:20:01,045 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=1766, Unknown=0, NotChecked=0, Total=1892 [2020-08-19 05:20:01,046 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 44 states. [2020-08-19 05:20:02,230 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:20:02,230 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2020-08-19 05:20:02,230 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-08-19 05:20:02,230 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 51 [2020-08-19 05:20:02,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:20:02,231 INFO L225 Difference]: With dead ends: 58 [2020-08-19 05:20:02,232 INFO L226 Difference]: Without dead ends: 53 [2020-08-19 05:20:02,232 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=126, Invalid=1766, Unknown=0, NotChecked=0, Total=1892 [2020-08-19 05:20:02,233 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-19 05:20:02,235 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2020-08-19 05:20:02,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-19 05:20:02,236 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2020-08-19 05:20:02,236 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 51 [2020-08-19 05:20:02,236 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:20:02,236 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2020-08-19 05:20:02,236 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-08-19 05:20:02,237 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2020-08-19 05:20:02,237 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-19 05:20:02,237 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:20:02,237 INFO L422 BasicCegarLoop]: trace histogram [42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:20:02,237 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-19 05:20:02,237 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:20:02,238 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:20:02,238 INFO L82 PathProgramCache]: Analyzing trace with hash 1850405150, now seen corresponding path program 42 times [2020-08-19 05:20:02,238 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:20:02,238 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [75849384] [2020-08-19 05:20:02,238 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:20:02,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:20:03,737 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:20:03,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:20:03,743 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 0 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:20:03,744 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [75849384] [2020-08-19 05:20:03,744 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:20:03,744 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-08-19 05:20:03,744 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1076938954] [2020-08-19 05:20:03,744 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-08-19 05:20:03,745 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:20:03,745 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-08-19 05:20:03,746 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=1851, Unknown=0, NotChecked=0, Total=1980 [2020-08-19 05:20:03,746 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 45 states. [2020-08-19 05:20:04,993 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:20:04,994 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2020-08-19 05:20:04,994 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-08-19 05:20:04,994 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 52 [2020-08-19 05:20:04,995 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:20:04,995 INFO L225 Difference]: With dead ends: 59 [2020-08-19 05:20:04,995 INFO L226 Difference]: Without dead ends: 54 [2020-08-19 05:20:04,996 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=129, Invalid=1851, Unknown=0, NotChecked=0, Total=1980 [2020-08-19 05:20:04,996 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-19 05:20:05,000 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2020-08-19 05:20:05,000 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-19 05:20:05,000 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2020-08-19 05:20:05,000 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 52 [2020-08-19 05:20:05,000 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:20:05,001 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2020-08-19 05:20:05,001 INFO L480 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-08-19 05:20:05,001 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2020-08-19 05:20:05,001 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-08-19 05:20:05,001 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:20:05,001 INFO L422 BasicCegarLoop]: trace histogram [43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:20:05,002 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2020-08-19 05:20:05,002 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:20:05,002 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:20:05,002 INFO L82 PathProgramCache]: Analyzing trace with hash 1564446065, now seen corresponding path program 43 times [2020-08-19 05:20:05,002 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:20:05,002 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1776292131] [2020-08-19 05:20:05,002 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:20:05,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:20:06,566 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:20:06,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:20:06,572 INFO L134 CoverageAnalysis]: Checked inductivity of 946 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:20:06,572 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1776292131] [2020-08-19 05:20:06,572 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:20:06,572 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46] total 46 [2020-08-19 05:20:06,573 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [74341373] [2020-08-19 05:20:06,573 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-08-19 05:20:06,573 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:20:06,573 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-08-19 05:20:06,574 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=1938, Unknown=0, NotChecked=0, Total=2070 [2020-08-19 05:20:06,574 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand 46 states. [2020-08-19 05:20:07,862 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:20:07,862 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2020-08-19 05:20:07,862 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-08-19 05:20:07,863 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 53 [2020-08-19 05:20:07,863 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:20:07,863 INFO L225 Difference]: With dead ends: 60 [2020-08-19 05:20:07,864 INFO L226 Difference]: Without dead ends: 55 [2020-08-19 05:20:07,865 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=132, Invalid=1938, Unknown=0, NotChecked=0, Total=2070 [2020-08-19 05:20:07,865 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-19 05:20:07,868 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2020-08-19 05:20:07,868 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-19 05:20:07,868 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2020-08-19 05:20:07,868 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 53 [2020-08-19 05:20:07,869 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:20:07,869 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2020-08-19 05:20:07,869 INFO L480 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-08-19 05:20:07,869 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2020-08-19 05:20:07,869 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-19 05:20:07,869 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:20:07,869 INFO L422 BasicCegarLoop]: trace histogram [44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:20:07,869 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2020-08-19 05:20:07,869 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:20:07,870 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:20:07,870 INFO L82 PathProgramCache]: Analyzing trace with hash 1289649022, now seen corresponding path program 44 times [2020-08-19 05:20:07,870 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:20:07,870 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [211359792] [2020-08-19 05:20:07,870 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:20:07,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:20:09,579 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:20:09,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:20:09,586 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:20:09,586 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [211359792] [2020-08-19 05:20:09,586 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:20:09,587 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47] total 47 [2020-08-19 05:20:09,587 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [158507781] [2020-08-19 05:20:09,587 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-08-19 05:20:09,587 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:20:09,587 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-08-19 05:20:09,588 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=2027, Unknown=0, NotChecked=0, Total=2162 [2020-08-19 05:20:09,588 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 47 states. [2020-08-19 05:20:10,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:20:10,910 INFO L93 Difference]: Finished difference Result 61 states and 61 transitions. [2020-08-19 05:20:10,910 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2020-08-19 05:20:10,911 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 54 [2020-08-19 05:20:10,911 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:20:10,911 INFO L225 Difference]: With dead ends: 61 [2020-08-19 05:20:10,912 INFO L226 Difference]: Without dead ends: 56 [2020-08-19 05:20:10,912 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=135, Invalid=2027, Unknown=0, NotChecked=0, Total=2162 [2020-08-19 05:20:10,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-19 05:20:10,916 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2020-08-19 05:20:10,916 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-08-19 05:20:10,916 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 56 transitions. [2020-08-19 05:20:10,917 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 56 transitions. Word has length 54 [2020-08-19 05:20:10,917 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:20:10,917 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 56 transitions. [2020-08-19 05:20:10,917 INFO L480 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-08-19 05:20:10,917 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 56 transitions. [2020-08-19 05:20:10,917 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-08-19 05:20:10,918 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:20:10,918 INFO L422 BasicCegarLoop]: trace histogram [45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:20:10,918 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2020-08-19 05:20:10,918 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:20:10,918 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:20:10,918 INFO L82 PathProgramCache]: Analyzing trace with hash 1360875281, now seen corresponding path program 45 times [2020-08-19 05:20:10,919 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:20:10,919 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1105361663] [2020-08-19 05:20:10,919 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:20:10,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:20:12,551 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:20:12,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:20:12,556 INFO L134 CoverageAnalysis]: Checked inductivity of 1035 backedges. 0 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:20:12,556 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1105361663] [2020-08-19 05:20:12,557 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:20:12,557 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48] total 48 [2020-08-19 05:20:12,557 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [748780734] [2020-08-19 05:20:12,557 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-08-19 05:20:12,557 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:20:12,558 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-08-19 05:20:12,558 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=2118, Unknown=0, NotChecked=0, Total=2256 [2020-08-19 05:20:12,558 INFO L87 Difference]: Start difference. First operand 56 states and 56 transitions. Second operand 48 states. [2020-08-19 05:20:13,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:20:13,928 INFO L93 Difference]: Finished difference Result 62 states and 62 transitions. [2020-08-19 05:20:13,928 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-08-19 05:20:13,928 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 55 [2020-08-19 05:20:13,929 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:20:13,929 INFO L225 Difference]: With dead ends: 62 [2020-08-19 05:20:13,929 INFO L226 Difference]: Without dead ends: 57 [2020-08-19 05:20:13,930 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=138, Invalid=2118, Unknown=0, NotChecked=0, Total=2256 [2020-08-19 05:20:13,930 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-08-19 05:20:13,933 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2020-08-19 05:20:13,933 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-19 05:20:13,934 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2020-08-19 05:20:13,934 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 55 [2020-08-19 05:20:13,934 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:20:13,934 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2020-08-19 05:20:13,934 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-08-19 05:20:13,935 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2020-08-19 05:20:13,935 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-19 05:20:13,935 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:20:13,935 INFO L422 BasicCegarLoop]: trace histogram [46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:20:13,935 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2020-08-19 05:20:13,935 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:20:13,936 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:20:13,936 INFO L82 PathProgramCache]: Analyzing trace with hash -726077986, now seen corresponding path program 46 times [2020-08-19 05:20:13,936 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:20:13,936 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1638450755] [2020-08-19 05:20:13,936 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:20:13,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:20:15,578 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:20:15,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:20:15,585 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:20:15,586 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1638450755] [2020-08-19 05:20:15,586 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:20:15,586 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49] total 49 [2020-08-19 05:20:15,586 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1976059492] [2020-08-19 05:20:15,587 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2020-08-19 05:20:15,587 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:20:15,587 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2020-08-19 05:20:15,587 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=2211, Unknown=0, NotChecked=0, Total=2352 [2020-08-19 05:20:15,587 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 49 states. [2020-08-19 05:20:17,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:20:17,062 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2020-08-19 05:20:17,063 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2020-08-19 05:20:17,063 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 56 [2020-08-19 05:20:17,064 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:20:17,064 INFO L225 Difference]: With dead ends: 63 [2020-08-19 05:20:17,064 INFO L226 Difference]: Without dead ends: 58 [2020-08-19 05:20:17,065 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=141, Invalid=2211, Unknown=0, NotChecked=0, Total=2352 [2020-08-19 05:20:17,065 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-19 05:20:17,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2020-08-19 05:20:17,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-08-19 05:20:17,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 58 transitions. [2020-08-19 05:20:17,070 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 58 transitions. Word has length 56 [2020-08-19 05:20:17,070 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:20:17,070 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 58 transitions. [2020-08-19 05:20:17,070 INFO L480 AbstractCegarLoop]: Interpolant automaton has 49 states. [2020-08-19 05:20:17,070 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 58 transitions. [2020-08-19 05:20:17,070 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-08-19 05:20:17,071 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:20:17,071 INFO L422 BasicCegarLoop]: trace histogram [47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:20:17,071 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2020-08-19 05:20:17,071 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:20:17,071 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:20:17,071 INFO L82 PathProgramCache]: Analyzing trace with hash -997119823, now seen corresponding path program 47 times [2020-08-19 05:20:17,071 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:20:17,072 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1668859324] [2020-08-19 05:20:17,072 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:20:17,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat