/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5 --traceabstraction.additional.smt.options interpolation-heuristic=SMALLESTAMONGWIDE --traceabstraction.additional.smt.options tolerance=0.2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/array_1-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-19 04:30:42,361 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-19 04:30:42,365 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-19 04:30:42,409 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-19 04:30:42,410 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-19 04:30:42,422 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-19 04:30:42,424 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-19 04:30:42,426 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-19 04:30:42,429 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-19 04:30:42,431 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-19 04:30:42,432 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-19 04:30:42,434 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-19 04:30:42,434 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-19 04:30:42,439 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-19 04:30:42,441 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-19 04:30:42,443 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-19 04:30:42,445 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-19 04:30:42,446 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-19 04:30:42,449 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-19 04:30:42,455 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-19 04:30:42,458 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-19 04:30:42,459 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-19 04:30:42,460 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-19 04:30:42,461 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-19 04:30:42,465 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-19 04:30:42,476 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-19 04:30:42,477 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-19 04:30:42,478 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-19 04:30:42,479 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-19 04:30:42,521 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-19 04:30:42,521 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-19 04:30:42,523 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-19 04:30:42,523 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-19 04:30:42,523 INFO L138 SettingsManager]: * Use SBE=true [2020-08-19 04:30:42,523 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-19 04:30:42,524 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-19 04:30:42,524 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-19 04:30:42,524 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-19 04:30:42,524 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-19 04:30:42,525 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-19 04:30:42,526 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-19 04:30:42,526 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-19 04:30:42,526 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-19 04:30:42,526 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-19 04:30:42,527 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-19 04:30:42,527 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-19 04:30:42,527 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-19 04:30:42,527 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-19 04:30:42,527 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-19 04:30:42,528 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-19 04:30:42,528 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-19 04:30:42,528 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-19 04:30:42,528 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-19 04:30:42,528 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-19 04:30:42,529 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-19 04:30:42,529 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-19 04:30:42,529 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-19 04:30:42,529 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-19 04:30:42,529 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.2; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.2; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.2; [2020-08-19 04:30:42,815 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-19 04:30:42,836 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-19 04:30:42,843 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-19 04:30:42,845 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-19 04:30:42,845 INFO L275 PluginConnector]: CDTParser initialized [2020-08-19 04:30:42,846 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/array_1-2.c [2020-08-19 04:30:42,910 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/245ebddbe/918293eba53c4b1f88bac997f236d75a/FLAG3661cbd3b [2020-08-19 04:30:43,378 INFO L306 CDTParser]: Found 1 translation units. [2020-08-19 04:30:43,379 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-acceleration/array_1-2.c [2020-08-19 04:30:43,385 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/245ebddbe/918293eba53c4b1f88bac997f236d75a/FLAG3661cbd3b [2020-08-19 04:30:43,757 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/245ebddbe/918293eba53c4b1f88bac997f236d75a [2020-08-19 04:30:43,768 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-19 04:30:43,770 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-19 04:30:43,774 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-19 04:30:43,774 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-19 04:30:43,778 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-19 04:30:43,779 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 04:30:43" (1/1) ... [2020-08-19 04:30:43,783 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1e28bb4e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 04:30:43, skipping insertion in model container [2020-08-19 04:30:43,784 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 04:30:43" (1/1) ... [2020-08-19 04:30:43,794 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-19 04:30:43,812 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-19 04:30:43,986 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 04:30:43,991 INFO L203 MainTranslator]: Completed pre-run [2020-08-19 04:30:44,012 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 04:30:44,030 INFO L208 MainTranslator]: Completed translation [2020-08-19 04:30:44,031 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 04:30:44 WrapperNode [2020-08-19 04:30:44,031 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-19 04:30:44,032 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-19 04:30:44,032 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-19 04:30:44,032 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-19 04:30:44,120 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 04:30:44" (1/1) ... [2020-08-19 04:30:44,122 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 04:30:44" (1/1) ... [2020-08-19 04:30:44,130 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 04:30:44" (1/1) ... [2020-08-19 04:30:44,131 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 04:30:44" (1/1) ... [2020-08-19 04:30:44,136 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 04:30:44" (1/1) ... [2020-08-19 04:30:44,141 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 04:30:44" (1/1) ... [2020-08-19 04:30:44,142 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 04:30:44" (1/1) ... [2020-08-19 04:30:44,150 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-19 04:30:44,151 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-19 04:30:44,151 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-19 04:30:44,151 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-19 04:30:44,152 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 04:30:44" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-19 04:30:44,213 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-19 04:30:44,213 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-19 04:30:44,213 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-19 04:30:44,213 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-19 04:30:44,213 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-19 04:30:44,214 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-19 04:30:44,214 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-19 04:30:44,214 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-19 04:30:44,214 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-19 04:30:44,214 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-19 04:30:44,215 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-19 04:30:44,215 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-19 04:30:44,215 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-19 04:30:44,421 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-19 04:30:44,425 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-19 04:30:44,435 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 04:30:44 BoogieIcfgContainer [2020-08-19 04:30:44,435 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-19 04:30:44,437 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-19 04:30:44,437 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-19 04:30:44,443 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-19 04:30:44,444 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.08 04:30:43" (1/3) ... [2020-08-19 04:30:44,444 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@e3afba2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 04:30:44, skipping insertion in model container [2020-08-19 04:30:44,445 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 04:30:44" (2/3) ... [2020-08-19 04:30:44,445 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@e3afba2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 04:30:44, skipping insertion in model container [2020-08-19 04:30:44,445 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 04:30:44" (3/3) ... [2020-08-19 04:30:44,447 INFO L109 eAbstractionObserver]: Analyzing ICFG array_1-2.c [2020-08-19 04:30:44,466 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-19 04:30:44,476 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-19 04:30:44,510 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-19 04:30:44,538 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-19 04:30:44,538 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-19 04:30:44,538 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-19 04:30:44,539 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-19 04:30:44,539 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-19 04:30:44,539 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-19 04:30:44,539 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-19 04:30:44,539 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-19 04:30:44,561 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2020-08-19 04:30:44,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-19 04:30:44,566 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:30:44,567 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:30:44,567 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:30:44,572 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:30:44,573 INFO L82 PathProgramCache]: Analyzing trace with hash -267856937, now seen corresponding path program 1 times [2020-08-19 04:30:44,581 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:30:44,582 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1689758341] [2020-08-19 04:30:44,582 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:30:44,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:44,731 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:30:44,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:44,743 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:30:44,744 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1689758341] [2020-08-19 04:30:44,746 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 04:30:44,747 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-19 04:30:44,748 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [818318279] [2020-08-19 04:30:44,753 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-19 04:30:44,754 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:30:44,769 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-19 04:30:44,770 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-19 04:30:44,773 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 3 states. [2020-08-19 04:30:44,844 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:30:44,845 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2020-08-19 04:30:44,845 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-19 04:30:44,847 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 12 [2020-08-19 04:30:44,848 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:30:44,856 INFO L225 Difference]: With dead ends: 34 [2020-08-19 04:30:44,857 INFO L226 Difference]: Without dead ends: 14 [2020-08-19 04:30:44,860 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-19 04:30:44,883 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-08-19 04:30:44,901 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-08-19 04:30:44,903 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-08-19 04:30:44,904 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-08-19 04:30:44,906 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-08-19 04:30:44,906 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:30:44,907 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-08-19 04:30:44,907 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-19 04:30:44,907 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-08-19 04:30:44,908 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-19 04:30:44,908 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:30:44,908 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:30:44,909 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-19 04:30:44,909 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:30:44,910 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:30:44,910 INFO L82 PathProgramCache]: Analyzing trace with hash -439631843, now seen corresponding path program 1 times [2020-08-19 04:30:44,910 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:30:44,911 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1526625034] [2020-08-19 04:30:44,911 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:30:44,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:45,001 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:30:45,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:45,009 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:30:45,010 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1526625034] [2020-08-19 04:30:45,010 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 04:30:45,010 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-19 04:30:45,011 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [687700877] [2020-08-19 04:30:45,013 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-19 04:30:45,013 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:30:45,013 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-19 04:30:45,014 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-19 04:30:45,014 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 4 states. [2020-08-19 04:30:45,067 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:30:45,068 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2020-08-19 04:30:45,068 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-19 04:30:45,069 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 12 [2020-08-19 04:30:45,069 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:30:45,070 INFO L225 Difference]: With dead ends: 22 [2020-08-19 04:30:45,071 INFO L226 Difference]: Without dead ends: 16 [2020-08-19 04:30:45,072 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-19 04:30:45,072 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-19 04:30:45,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2020-08-19 04:30:45,080 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-19 04:30:45,081 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-08-19 04:30:45,081 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 12 [2020-08-19 04:30:45,082 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:30:45,082 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-08-19 04:30:45,082 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-19 04:30:45,083 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-08-19 04:30:45,084 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-19 04:30:45,084 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:30:45,085 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:30:45,085 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-19 04:30:45,085 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:30:45,086 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:30:45,088 INFO L82 PathProgramCache]: Analyzing trace with hash 1874839487, now seen corresponding path program 1 times [2020-08-19 04:30:45,088 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:30:45,089 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1258380771] [2020-08-19 04:30:45,089 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:30:45,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:45,167 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:30:45,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:45,174 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 04:30:45,175 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1258380771] [2020-08-19 04:30:45,175 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:30:45,175 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-19 04:30:45,176 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1069914781] [2020-08-19 04:30:45,176 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-19 04:30:45,177 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:30:45,177 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-19 04:30:45,177 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-19 04:30:45,178 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 5 states. [2020-08-19 04:30:45,227 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:30:45,227 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2020-08-19 04:30:45,228 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-19 04:30:45,228 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-08-19 04:30:45,228 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:30:45,229 INFO L225 Difference]: With dead ends: 24 [2020-08-19 04:30:45,229 INFO L226 Difference]: Without dead ends: 18 [2020-08-19 04:30:45,230 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-19 04:30:45,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-19 04:30:45,234 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17. [2020-08-19 04:30:45,235 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-19 04:30:45,236 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-19 04:30:45,236 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 14 [2020-08-19 04:30:45,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:30:45,237 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-19 04:30:45,237 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-19 04:30:45,237 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-19 04:30:45,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-19 04:30:45,238 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:30:45,238 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:30:45,239 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-19 04:30:45,239 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:30:45,239 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:30:45,240 INFO L82 PathProgramCache]: Analyzing trace with hash 1288728289, now seen corresponding path program 2 times [2020-08-19 04:30:45,240 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:30:45,240 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1600946068] [2020-08-19 04:30:45,240 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:30:45,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:45,308 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:30:45,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:45,314 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:30:45,314 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1600946068] [2020-08-19 04:30:45,315 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:30:45,315 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-19 04:30:45,315 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [833335094] [2020-08-19 04:30:45,316 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-19 04:30:45,316 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:30:45,316 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-19 04:30:45,316 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-19 04:30:45,317 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 6 states. [2020-08-19 04:30:45,365 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:30:45,365 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-08-19 04:30:45,366 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-19 04:30:45,366 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 16 [2020-08-19 04:30:45,366 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:30:45,367 INFO L225 Difference]: With dead ends: 26 [2020-08-19 04:30:45,367 INFO L226 Difference]: Without dead ends: 20 [2020-08-19 04:30:45,368 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-19 04:30:45,368 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-19 04:30:45,373 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 19. [2020-08-19 04:30:45,373 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-19 04:30:45,374 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2020-08-19 04:30:45,374 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 16 [2020-08-19 04:30:45,374 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:30:45,375 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2020-08-19 04:30:45,375 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-19 04:30:45,375 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2020-08-19 04:30:45,376 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-19 04:30:45,376 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:30:45,376 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:30:45,376 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-19 04:30:45,377 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:30:45,377 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:30:45,377 INFO L82 PathProgramCache]: Analyzing trace with hash 676582787, now seen corresponding path program 3 times [2020-08-19 04:30:45,378 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:30:45,378 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1805523554] [2020-08-19 04:30:45,378 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:30:45,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:45,452 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:30:45,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:45,459 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:30:45,459 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1805523554] [2020-08-19 04:30:45,460 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:30:45,460 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-19 04:30:45,460 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [595622562] [2020-08-19 04:30:45,461 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-19 04:30:45,461 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:30:45,461 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-19 04:30:45,462 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-19 04:30:45,462 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 7 states. [2020-08-19 04:30:45,521 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:30:45,521 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2020-08-19 04:30:45,522 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-19 04:30:45,522 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 18 [2020-08-19 04:30:45,523 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:30:45,523 INFO L225 Difference]: With dead ends: 28 [2020-08-19 04:30:45,523 INFO L226 Difference]: Without dead ends: 22 [2020-08-19 04:30:45,524 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-19 04:30:45,525 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-19 04:30:45,529 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2020-08-19 04:30:45,529 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-19 04:30:45,530 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2020-08-19 04:30:45,531 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 18 [2020-08-19 04:30:45,531 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:30:45,531 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2020-08-19 04:30:45,531 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-19 04:30:45,532 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2020-08-19 04:30:45,532 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-19 04:30:45,532 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:30:45,533 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:30:45,533 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-19 04:30:45,533 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:30:45,534 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:30:45,534 INFO L82 PathProgramCache]: Analyzing trace with hash 815274917, now seen corresponding path program 4 times [2020-08-19 04:30:45,534 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:30:45,534 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [98409920] [2020-08-19 04:30:45,535 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:30:45,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:45,667 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:30:45,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:45,674 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:30:45,675 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [98409920] [2020-08-19 04:30:45,675 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:30:45,675 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-19 04:30:45,676 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [98400577] [2020-08-19 04:30:45,677 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-19 04:30:45,678 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:30:45,679 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-19 04:30:45,680 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-08-19 04:30:45,680 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 8 states. [2020-08-19 04:30:45,759 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:30:45,759 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2020-08-19 04:30:45,760 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-19 04:30:45,760 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 20 [2020-08-19 04:30:45,761 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:30:45,762 INFO L225 Difference]: With dead ends: 30 [2020-08-19 04:30:45,763 INFO L226 Difference]: Without dead ends: 24 [2020-08-19 04:30:45,764 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-08-19 04:30:45,765 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-19 04:30:45,771 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2020-08-19 04:30:45,771 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-19 04:30:45,774 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-08-19 04:30:45,774 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 20 [2020-08-19 04:30:45,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:30:45,774 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-08-19 04:30:45,774 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-19 04:30:45,775 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-08-19 04:30:45,777 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-19 04:30:45,777 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:30:45,777 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:30:45,778 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-19 04:30:45,778 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:30:45,778 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:30:45,778 INFO L82 PathProgramCache]: Analyzing trace with hash 954425671, now seen corresponding path program 5 times [2020-08-19 04:30:45,779 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:30:45,779 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [270953861] [2020-08-19 04:30:45,780 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:30:45,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:45,883 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:30:45,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:45,889 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:30:45,889 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [270953861] [2020-08-19 04:30:45,889 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:30:45,890 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-19 04:30:45,890 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1904489673] [2020-08-19 04:30:45,890 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-19 04:30:45,891 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:30:45,891 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-19 04:30:45,891 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-08-19 04:30:45,891 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 9 states. [2020-08-19 04:30:45,948 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:30:45,949 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-08-19 04:30:45,949 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-19 04:30:45,949 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 22 [2020-08-19 04:30:45,950 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:30:45,950 INFO L225 Difference]: With dead ends: 32 [2020-08-19 04:30:45,950 INFO L226 Difference]: Without dead ends: 26 [2020-08-19 04:30:45,951 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-08-19 04:30:45,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-19 04:30:45,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2020-08-19 04:30:45,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-19 04:30:45,956 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2020-08-19 04:30:45,957 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 22 [2020-08-19 04:30:45,957 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:30:45,957 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2020-08-19 04:30:45,957 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-19 04:30:45,957 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2020-08-19 04:30:45,958 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-19 04:30:45,958 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:30:45,958 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:30:45,959 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-19 04:30:45,959 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:30:45,959 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:30:45,959 INFO L82 PathProgramCache]: Analyzing trace with hash 1534314089, now seen corresponding path program 6 times [2020-08-19 04:30:45,959 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:30:45,960 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [88958567] [2020-08-19 04:30:45,960 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:30:45,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:46,049 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:30:46,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:46,054 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 04:30:46,054 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [88958567] [2020-08-19 04:30:46,054 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:30:46,055 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-19 04:30:46,055 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [103025545] [2020-08-19 04:30:46,055 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-19 04:30:46,056 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:30:46,056 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-19 04:30:46,056 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-08-19 04:30:46,056 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 10 states. [2020-08-19 04:30:46,131 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:30:46,131 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2020-08-19 04:30:46,132 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-19 04:30:46,132 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 24 [2020-08-19 04:30:46,132 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:30:46,133 INFO L225 Difference]: With dead ends: 34 [2020-08-19 04:30:46,133 INFO L226 Difference]: Without dead ends: 28 [2020-08-19 04:30:46,134 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-08-19 04:30:46,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-19 04:30:46,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2020-08-19 04:30:46,138 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-19 04:30:46,139 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2020-08-19 04:30:46,139 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 24 [2020-08-19 04:30:46,139 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:30:46,140 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2020-08-19 04:30:46,140 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-19 04:30:46,140 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2020-08-19 04:30:46,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-19 04:30:46,141 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:30:46,141 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:30:46,141 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-19 04:30:46,141 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:30:46,142 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:30:46,142 INFO L82 PathProgramCache]: Analyzing trace with hash 461335307, now seen corresponding path program 7 times [2020-08-19 04:30:46,142 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:30:46,142 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [11238377] [2020-08-19 04:30:46,143 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:30:46,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:46,236 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:30:46,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:46,241 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:30:46,241 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [11238377] [2020-08-19 04:30:46,242 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:30:46,242 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-19 04:30:46,242 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [454072850] [2020-08-19 04:30:46,242 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-19 04:30:46,243 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:30:46,243 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-19 04:30:46,243 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-08-19 04:30:46,243 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 11 states. [2020-08-19 04:30:46,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:30:46,321 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2020-08-19 04:30:46,321 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-19 04:30:46,321 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 26 [2020-08-19 04:30:46,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:30:46,322 INFO L225 Difference]: With dead ends: 36 [2020-08-19 04:30:46,322 INFO L226 Difference]: Without dead ends: 30 [2020-08-19 04:30:46,323 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-08-19 04:30:46,323 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-19 04:30:46,327 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-08-19 04:30:46,327 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-19 04:30:46,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-08-19 04:30:46,328 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 26 [2020-08-19 04:30:46,328 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:30:46,328 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-08-19 04:30:46,329 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-19 04:30:46,329 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-08-19 04:30:46,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-19 04:30:46,330 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:30:46,330 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:30:46,330 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-19 04:30:46,330 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:30:46,331 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:30:46,331 INFO L82 PathProgramCache]: Analyzing trace with hash 120876845, now seen corresponding path program 8 times [2020-08-19 04:30:46,331 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:30:46,331 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [231676960] [2020-08-19 04:30:46,331 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:30:46,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:46,444 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:30:46,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:46,449 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:30:46,449 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [231676960] [2020-08-19 04:30:46,449 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:30:46,450 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-19 04:30:46,450 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1923154570] [2020-08-19 04:30:46,450 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-19 04:30:46,451 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:30:46,451 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-19 04:30:46,451 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-08-19 04:30:46,452 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 12 states. [2020-08-19 04:30:46,537 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:30:46,537 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-08-19 04:30:46,538 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-19 04:30:46,538 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 28 [2020-08-19 04:30:46,539 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:30:46,540 INFO L225 Difference]: With dead ends: 38 [2020-08-19 04:30:46,540 INFO L226 Difference]: Without dead ends: 32 [2020-08-19 04:30:46,540 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-08-19 04:30:46,541 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-19 04:30:46,545 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-08-19 04:30:46,545 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-19 04:30:46,546 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2020-08-19 04:30:46,546 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 28 [2020-08-19 04:30:46,546 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:30:46,547 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2020-08-19 04:30:46,547 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-19 04:30:46,547 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2020-08-19 04:30:46,548 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-19 04:30:46,548 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:30:46,548 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:30:46,548 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-19 04:30:46,549 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:30:46,549 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:30:46,549 INFO L82 PathProgramCache]: Analyzing trace with hash -642190641, now seen corresponding path program 9 times [2020-08-19 04:30:46,549 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:30:46,550 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [102373770] [2020-08-19 04:30:46,550 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:30:46,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:46,694 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:30:46,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:46,699 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:30:46,699 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [102373770] [2020-08-19 04:30:46,699 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:30:46,700 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-19 04:30:46,700 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [607031929] [2020-08-19 04:30:46,700 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-19 04:30:46,701 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:30:46,701 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-19 04:30:46,701 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-08-19 04:30:46,701 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 13 states. [2020-08-19 04:30:46,775 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:30:46,775 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2020-08-19 04:30:46,776 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-19 04:30:46,776 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 30 [2020-08-19 04:30:46,776 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:30:46,777 INFO L225 Difference]: With dead ends: 40 [2020-08-19 04:30:46,777 INFO L226 Difference]: Without dead ends: 34 [2020-08-19 04:30:46,777 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-08-19 04:30:46,778 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-19 04:30:46,781 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-08-19 04:30:46,781 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-19 04:30:46,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2020-08-19 04:30:46,782 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 30 [2020-08-19 04:30:46,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:30:46,783 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2020-08-19 04:30:46,783 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-19 04:30:46,783 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2020-08-19 04:30:46,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-19 04:30:46,784 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:30:46,784 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:30:46,784 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-19 04:30:46,784 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:30:46,785 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:30:46,785 INFO L82 PathProgramCache]: Analyzing trace with hash 489362929, now seen corresponding path program 10 times [2020-08-19 04:30:46,785 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:30:46,785 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [607510294] [2020-08-19 04:30:46,785 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:30:46,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:46,912 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:30:46,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:46,917 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:30:46,917 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [607510294] [2020-08-19 04:30:46,917 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:30:46,917 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-19 04:30:46,917 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1802108556] [2020-08-19 04:30:46,918 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-19 04:30:46,918 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:30:46,918 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-19 04:30:46,919 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2020-08-19 04:30:46,919 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 14 states. [2020-08-19 04:30:46,981 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:30:46,982 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2020-08-19 04:30:46,982 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-19 04:30:46,982 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 32 [2020-08-19 04:30:46,983 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:30:46,983 INFO L225 Difference]: With dead ends: 42 [2020-08-19 04:30:46,983 INFO L226 Difference]: Without dead ends: 36 [2020-08-19 04:30:46,984 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2020-08-19 04:30:46,984 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-19 04:30:46,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-08-19 04:30:46,988 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-19 04:30:46,989 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-08-19 04:30:46,989 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 32 [2020-08-19 04:30:46,989 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:30:46,990 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-08-19 04:30:46,990 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-19 04:30:46,990 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-08-19 04:30:46,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-19 04:30:46,991 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:30:46,991 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:30:46,991 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-19 04:30:46,992 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:30:46,992 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:30:46,992 INFO L82 PathProgramCache]: Analyzing trace with hash 1285617811, now seen corresponding path program 11 times [2020-08-19 04:30:46,992 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:30:46,992 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [381713815] [2020-08-19 04:30:46,993 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:30:47,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:47,165 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:30:47,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:47,169 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:30:47,170 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [381713815] [2020-08-19 04:30:47,170 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:30:47,170 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-19 04:30:47,170 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [475839831] [2020-08-19 04:30:47,171 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-19 04:30:47,171 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:30:47,171 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-19 04:30:47,172 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2020-08-19 04:30:47,172 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 15 states. [2020-08-19 04:30:47,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:30:47,251 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-08-19 04:30:47,251 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-19 04:30:47,252 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 34 [2020-08-19 04:30:47,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:30:47,252 INFO L225 Difference]: With dead ends: 44 [2020-08-19 04:30:47,253 INFO L226 Difference]: Without dead ends: 38 [2020-08-19 04:30:47,253 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2020-08-19 04:30:47,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-19 04:30:47,257 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-08-19 04:30:47,257 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-19 04:30:47,258 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2020-08-19 04:30:47,258 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 34 [2020-08-19 04:30:47,258 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:30:47,259 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2020-08-19 04:30:47,259 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-19 04:30:47,259 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2020-08-19 04:30:47,260 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-19 04:30:47,260 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:30:47,260 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:30:47,260 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-19 04:30:47,260 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:30:47,260 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:30:47,261 INFO L82 PathProgramCache]: Analyzing trace with hash 1982380725, now seen corresponding path program 12 times [2020-08-19 04:30:47,261 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:30:47,261 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [261224213] [2020-08-19 04:30:47,261 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:30:47,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:47,417 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:30:47,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:47,422 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:30:47,422 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [261224213] [2020-08-19 04:30:47,423 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:30:47,423 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-19 04:30:47,423 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1898117992] [2020-08-19 04:30:47,424 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-19 04:30:47,424 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:30:47,424 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-19 04:30:47,424 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2020-08-19 04:30:47,425 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 16 states. [2020-08-19 04:30:47,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:30:47,510 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2020-08-19 04:30:47,510 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-19 04:30:47,510 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 36 [2020-08-19 04:30:47,511 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:30:47,511 INFO L225 Difference]: With dead ends: 46 [2020-08-19 04:30:47,511 INFO L226 Difference]: Without dead ends: 40 [2020-08-19 04:30:47,512 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2020-08-19 04:30:47,512 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-19 04:30:47,515 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2020-08-19 04:30:47,516 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-19 04:30:47,516 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2020-08-19 04:30:47,516 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 36 [2020-08-19 04:30:47,517 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:30:47,517 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2020-08-19 04:30:47,517 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-19 04:30:47,517 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2020-08-19 04:30:47,518 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-19 04:30:47,518 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:30:47,518 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:30:47,518 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-19 04:30:47,519 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:30:47,519 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:30:47,519 INFO L82 PathProgramCache]: Analyzing trace with hash 1556642903, now seen corresponding path program 13 times [2020-08-19 04:30:47,519 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:30:47,520 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1636741727] [2020-08-19 04:30:47,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:30:47,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:47,689 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:30:47,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:47,693 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:30:47,693 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1636741727] [2020-08-19 04:30:47,694 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:30:47,694 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-19 04:30:47,695 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1755097268] [2020-08-19 04:30:47,695 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-19 04:30:47,696 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:30:47,696 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-19 04:30:47,696 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2020-08-19 04:30:47,696 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 17 states. [2020-08-19 04:30:47,794 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:30:47,794 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2020-08-19 04:30:47,795 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-19 04:30:47,795 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 38 [2020-08-19 04:30:47,795 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:30:47,796 INFO L225 Difference]: With dead ends: 48 [2020-08-19 04:30:47,796 INFO L226 Difference]: Without dead ends: 42 [2020-08-19 04:30:47,797 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2020-08-19 04:30:47,799 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-19 04:30:47,804 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2020-08-19 04:30:47,805 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-19 04:30:47,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-08-19 04:30:47,808 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 38 [2020-08-19 04:30:47,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:30:47,808 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-08-19 04:30:47,808 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-19 04:30:47,808 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-08-19 04:30:47,809 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-19 04:30:47,809 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:30:47,809 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:30:47,809 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-19 04:30:47,813 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:30:47,813 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:30:47,813 INFO L82 PathProgramCache]: Analyzing trace with hash 444489081, now seen corresponding path program 14 times [2020-08-19 04:30:47,813 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:30:47,813 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [92254451] [2020-08-19 04:30:47,814 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:30:47,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:48,029 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:30:48,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:48,034 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:30:48,035 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [92254451] [2020-08-19 04:30:48,037 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:30:48,038 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-19 04:30:48,038 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1539779144] [2020-08-19 04:30:48,039 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-19 04:30:48,040 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:30:48,041 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-19 04:30:48,041 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2020-08-19 04:30:48,041 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 18 states. [2020-08-19 04:30:48,169 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:30:48,169 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-08-19 04:30:48,170 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-19 04:30:48,170 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 40 [2020-08-19 04:30:48,170 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:30:48,171 INFO L225 Difference]: With dead ends: 50 [2020-08-19 04:30:48,171 INFO L226 Difference]: Without dead ends: 44 [2020-08-19 04:30:48,172 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2020-08-19 04:30:48,173 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-19 04:30:48,179 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2020-08-19 04:30:48,179 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-19 04:30:48,180 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2020-08-19 04:30:48,180 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 40 [2020-08-19 04:30:48,180 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:30:48,180 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2020-08-19 04:30:48,180 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-19 04:30:48,180 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2020-08-19 04:30:48,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-19 04:30:48,181 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:30:48,181 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:30:48,182 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-19 04:30:48,182 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:30:48,182 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:30:48,182 INFO L82 PathProgramCache]: Analyzing trace with hash 1111522843, now seen corresponding path program 15 times [2020-08-19 04:30:48,182 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:30:48,183 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1488616471] [2020-08-19 04:30:48,183 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:30:48,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:48,373 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:30:48,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:48,379 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:30:48,380 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1488616471] [2020-08-19 04:30:48,380 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:30:48,380 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-19 04:30:48,380 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1424225630] [2020-08-19 04:30:48,381 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-19 04:30:48,382 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:30:48,382 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-19 04:30:48,383 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2020-08-19 04:30:48,383 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 19 states. [2020-08-19 04:30:48,493 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:30:48,493 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2020-08-19 04:30:48,493 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-19 04:30:48,494 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 42 [2020-08-19 04:30:48,494 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:30:48,495 INFO L225 Difference]: With dead ends: 52 [2020-08-19 04:30:48,495 INFO L226 Difference]: Without dead ends: 46 [2020-08-19 04:30:48,496 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2020-08-19 04:30:48,496 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-19 04:30:48,503 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2020-08-19 04:30:48,503 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-19 04:30:48,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2020-08-19 04:30:48,505 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 42 [2020-08-19 04:30:48,505 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:30:48,506 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2020-08-19 04:30:48,506 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-19 04:30:48,506 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2020-08-19 04:30:48,507 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-19 04:30:48,507 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:30:48,508 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:30:48,508 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-19 04:30:48,508 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:30:48,508 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:30:48,508 INFO L82 PathProgramCache]: Analyzing trace with hash -2114126275, now seen corresponding path program 16 times [2020-08-19 04:30:48,509 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:30:48,509 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [293580511] [2020-08-19 04:30:48,509 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:30:48,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:48,756 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:30:48,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:48,762 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:30:48,762 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [293580511] [2020-08-19 04:30:48,762 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:30:48,763 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-19 04:30:48,763 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [933639426] [2020-08-19 04:30:48,765 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-19 04:30:48,765 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:30:48,765 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-19 04:30:48,770 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2020-08-19 04:30:48,771 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 20 states. [2020-08-19 04:30:48,899 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:30:48,899 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2020-08-19 04:30:48,900 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-19 04:30:48,900 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 44 [2020-08-19 04:30:48,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:30:48,901 INFO L225 Difference]: With dead ends: 54 [2020-08-19 04:30:48,901 INFO L226 Difference]: Without dead ends: 48 [2020-08-19 04:30:48,902 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2020-08-19 04:30:48,902 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-19 04:30:48,906 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 47. [2020-08-19 04:30:48,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-19 04:30:48,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2020-08-19 04:30:48,907 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 44 [2020-08-19 04:30:48,907 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:30:48,908 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2020-08-19 04:30:48,908 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-19 04:30:48,908 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2020-08-19 04:30:48,908 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-19 04:30:48,909 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:30:48,909 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:30:48,909 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-19 04:30:48,909 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:30:48,910 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:30:48,910 INFO L82 PathProgramCache]: Analyzing trace with hash -996540961, now seen corresponding path program 17 times [2020-08-19 04:30:48,910 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:30:48,910 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2117794658] [2020-08-19 04:30:48,910 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:30:48,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:49,145 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:30:49,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:49,152 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:30:49,152 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2117794658] [2020-08-19 04:30:49,152 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:30:49,153 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-19 04:30:49,153 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1464628415] [2020-08-19 04:30:49,153 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-19 04:30:49,154 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:30:49,154 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-19 04:30:49,154 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2020-08-19 04:30:49,155 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 21 states. [2020-08-19 04:30:49,271 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:30:49,271 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2020-08-19 04:30:49,275 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-19 04:30:49,275 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 46 [2020-08-19 04:30:49,275 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:30:49,276 INFO L225 Difference]: With dead ends: 56 [2020-08-19 04:30:49,276 INFO L226 Difference]: Without dead ends: 50 [2020-08-19 04:30:49,277 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2020-08-19 04:30:49,277 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-08-19 04:30:49,280 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 49. [2020-08-19 04:30:49,280 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-19 04:30:49,281 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2020-08-19 04:30:49,281 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 46 [2020-08-19 04:30:49,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:30:49,281 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2020-08-19 04:30:49,281 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-19 04:30:49,281 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2020-08-19 04:30:49,282 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-19 04:30:49,282 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:30:49,282 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:30:49,283 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-19 04:30:49,283 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:30:49,283 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:30:49,283 INFO L82 PathProgramCache]: Analyzing trace with hash -738878207, now seen corresponding path program 18 times [2020-08-19 04:30:49,283 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:30:49,284 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1006667873] [2020-08-19 04:30:49,284 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:30:49,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:49,585 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:30:49,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:49,590 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:30:49,591 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1006667873] [2020-08-19 04:30:49,591 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:30:49,591 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-19 04:30:49,591 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1960351729] [2020-08-19 04:30:49,592 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-19 04:30:49,592 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:30:49,593 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-19 04:30:49,593 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2020-08-19 04:30:49,593 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 22 states. [2020-08-19 04:30:49,673 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:30:49,673 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2020-08-19 04:30:49,674 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-19 04:30:49,674 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 48 [2020-08-19 04:30:49,674 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:30:49,675 INFO L225 Difference]: With dead ends: 58 [2020-08-19 04:30:49,675 INFO L226 Difference]: Without dead ends: 52 [2020-08-19 04:30:49,676 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2020-08-19 04:30:49,676 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-19 04:30:49,680 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2020-08-19 04:30:49,680 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-19 04:30:49,680 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2020-08-19 04:30:49,681 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 48 [2020-08-19 04:30:49,681 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:30:49,681 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2020-08-19 04:30:49,681 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-19 04:30:49,681 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2020-08-19 04:30:49,682 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-19 04:30:49,682 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:30:49,682 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:30:49,682 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-19 04:30:49,683 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:30:49,683 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:30:49,683 INFO L82 PathProgramCache]: Analyzing trace with hash 2061892515, now seen corresponding path program 19 times [2020-08-19 04:30:49,683 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:30:49,683 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1312925958] [2020-08-19 04:30:49,684 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:30:49,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:49,972 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:30:49,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:49,977 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:30:49,978 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1312925958] [2020-08-19 04:30:49,978 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:30:49,978 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-19 04:30:49,978 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1694450194] [2020-08-19 04:30:49,979 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-19 04:30:49,979 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:30:49,979 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-19 04:30:49,980 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2020-08-19 04:30:49,980 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 23 states. [2020-08-19 04:30:50,097 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:30:50,098 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2020-08-19 04:30:50,098 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-19 04:30:50,098 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 50 [2020-08-19 04:30:50,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:30:50,099 INFO L225 Difference]: With dead ends: 60 [2020-08-19 04:30:50,100 INFO L226 Difference]: Without dead ends: 54 [2020-08-19 04:30:50,100 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2020-08-19 04:30:50,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-19 04:30:50,104 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2020-08-19 04:30:50,104 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-19 04:30:50,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2020-08-19 04:30:50,105 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 50 [2020-08-19 04:30:50,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:30:50,105 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2020-08-19 04:30:50,105 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-19 04:30:50,105 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2020-08-19 04:30:50,106 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-19 04:30:50,106 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:30:50,106 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:30:50,106 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-19 04:30:50,106 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:30:50,107 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:30:50,107 INFO L82 PathProgramCache]: Analyzing trace with hash 658061765, now seen corresponding path program 20 times [2020-08-19 04:30:50,107 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:30:50,107 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [250212200] [2020-08-19 04:30:50,107 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:30:50,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:50,401 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:30:50,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:50,411 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:30:50,411 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [250212200] [2020-08-19 04:30:50,411 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:30:50,412 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-19 04:30:50,412 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1415474749] [2020-08-19 04:30:50,413 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-19 04:30:50,413 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:30:50,413 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-19 04:30:50,414 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=255, Invalid=297, Unknown=0, NotChecked=0, Total=552 [2020-08-19 04:30:50,415 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 24 states. [2020-08-19 04:30:50,523 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:30:50,523 INFO L93 Difference]: Finished difference Result 62 states and 62 transitions. [2020-08-19 04:30:50,524 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-19 04:30:50,524 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 52 [2020-08-19 04:30:50,524 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:30:50,525 INFO L225 Difference]: With dead ends: 62 [2020-08-19 04:30:50,525 INFO L226 Difference]: Without dead ends: 56 [2020-08-19 04:30:50,526 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=255, Invalid=297, Unknown=0, NotChecked=0, Total=552 [2020-08-19 04:30:50,526 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-19 04:30:50,529 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2020-08-19 04:30:50,529 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-19 04:30:50,530 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2020-08-19 04:30:50,530 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 52 [2020-08-19 04:30:50,530 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:30:50,530 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2020-08-19 04:30:50,531 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-19 04:30:50,531 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2020-08-19 04:30:50,531 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-19 04:30:50,531 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:30:50,532 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:30:50,532 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-19 04:30:50,532 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:30:50,532 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:30:50,532 INFO L82 PathProgramCache]: Analyzing trace with hash 196441959, now seen corresponding path program 21 times [2020-08-19 04:30:50,533 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:30:50,533 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2068705004] [2020-08-19 04:30:50,533 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:30:50,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:50,849 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:30:50,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:50,855 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:30:50,855 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2068705004] [2020-08-19 04:30:50,856 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:30:50,856 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-19 04:30:50,856 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [952311925] [2020-08-19 04:30:50,856 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-19 04:30:50,856 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:30:50,857 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-19 04:30:50,857 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=278, Invalid=322, Unknown=0, NotChecked=0, Total=600 [2020-08-19 04:30:50,857 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 25 states. [2020-08-19 04:30:50,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:30:50,971 INFO L93 Difference]: Finished difference Result 64 states and 64 transitions. [2020-08-19 04:30:50,972 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-19 04:30:50,972 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 54 [2020-08-19 04:30:50,972 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:30:50,972 INFO L225 Difference]: With dead ends: 64 [2020-08-19 04:30:50,973 INFO L226 Difference]: Without dead ends: 58 [2020-08-19 04:30:50,973 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=278, Invalid=322, Unknown=0, NotChecked=0, Total=600 [2020-08-19 04:30:50,974 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-19 04:30:50,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2020-08-19 04:30:50,977 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-19 04:30:50,977 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2020-08-19 04:30:50,978 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 54 [2020-08-19 04:30:50,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:30:50,978 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2020-08-19 04:30:50,978 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-19 04:30:50,978 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2020-08-19 04:30:50,979 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-19 04:30:50,979 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:30:50,979 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:30:50,979 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-19 04:30:50,979 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:30:50,980 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:30:50,980 INFO L82 PathProgramCache]: Analyzing trace with hash -1038560119, now seen corresponding path program 22 times [2020-08-19 04:30:50,980 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:30:50,980 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1553809417] [2020-08-19 04:30:50,980 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:30:50,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:51,332 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:30:51,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:51,339 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:30:51,340 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1553809417] [2020-08-19 04:30:51,340 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:30:51,340 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-19 04:30:51,340 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [843676013] [2020-08-19 04:30:51,341 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-19 04:30:51,341 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:30:51,341 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-19 04:30:51,342 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=302, Invalid=348, Unknown=0, NotChecked=0, Total=650 [2020-08-19 04:30:51,342 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 26 states. [2020-08-19 04:30:51,491 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:30:51,491 INFO L93 Difference]: Finished difference Result 66 states and 66 transitions. [2020-08-19 04:30:51,492 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-19 04:30:51,492 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 56 [2020-08-19 04:30:51,492 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:30:51,492 INFO L225 Difference]: With dead ends: 66 [2020-08-19 04:30:51,492 INFO L226 Difference]: Without dead ends: 60 [2020-08-19 04:30:51,493 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=302, Invalid=348, Unknown=0, NotChecked=0, Total=650 [2020-08-19 04:30:51,493 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-08-19 04:30:51,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2020-08-19 04:30:51,496 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-08-19 04:30:51,497 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2020-08-19 04:30:51,497 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 56 [2020-08-19 04:30:51,497 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:30:51,497 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2020-08-19 04:30:51,497 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-19 04:30:51,497 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2020-08-19 04:30:51,498 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-08-19 04:30:51,498 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:30:51,498 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:30:51,498 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-19 04:30:51,499 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:30:51,499 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:30:51,499 INFO L82 PathProgramCache]: Analyzing trace with hash 1830383915, now seen corresponding path program 23 times [2020-08-19 04:30:51,499 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:30:51,499 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1802231764] [2020-08-19 04:30:51,500 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:30:51,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:51,883 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:30:51,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:51,888 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:30:51,889 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1802231764] [2020-08-19 04:30:51,889 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:30:51,889 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-19 04:30:51,889 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1719579399] [2020-08-19 04:30:51,890 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-19 04:30:51,890 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:30:51,890 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-19 04:30:51,891 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=327, Invalid=375, Unknown=0, NotChecked=0, Total=702 [2020-08-19 04:30:51,891 INFO L87 Difference]: Start difference. First operand 59 states and 59 transitions. Second operand 27 states. [2020-08-19 04:30:52,051 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:30:52,051 INFO L93 Difference]: Finished difference Result 68 states and 68 transitions. [2020-08-19 04:30:52,054 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-19 04:30:52,054 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 58 [2020-08-19 04:30:52,055 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:30:52,055 INFO L225 Difference]: With dead ends: 68 [2020-08-19 04:30:52,055 INFO L226 Difference]: Without dead ends: 62 [2020-08-19 04:30:52,058 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=327, Invalid=375, Unknown=0, NotChecked=0, Total=702 [2020-08-19 04:30:52,058 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-08-19 04:30:52,062 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2020-08-19 04:30:52,062 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-08-19 04:30:52,063 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 61 transitions. [2020-08-19 04:30:52,065 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 61 transitions. Word has length 58 [2020-08-19 04:30:52,066 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:30:52,066 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 61 transitions. [2020-08-19 04:30:52,066 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-19 04:30:52,066 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 61 transitions. [2020-08-19 04:30:52,067 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-08-19 04:30:52,067 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:30:52,067 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:30:52,067 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-19 04:30:52,067 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:30:52,067 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:30:52,068 INFO L82 PathProgramCache]: Analyzing trace with hash 1516596557, now seen corresponding path program 24 times [2020-08-19 04:30:52,070 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:30:52,070 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1958135894] [2020-08-19 04:30:52,070 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:30:52,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:52,487 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:30:52,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:52,492 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:30:52,493 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1958135894] [2020-08-19 04:30:52,493 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:30:52,493 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-19 04:30:52,493 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1669527852] [2020-08-19 04:30:52,494 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-19 04:30:52,494 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:30:52,494 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-19 04:30:52,494 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=353, Invalid=403, Unknown=0, NotChecked=0, Total=756 [2020-08-19 04:30:52,495 INFO L87 Difference]: Start difference. First operand 61 states and 61 transitions. Second operand 28 states. [2020-08-19 04:30:52,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:30:52,665 INFO L93 Difference]: Finished difference Result 70 states and 70 transitions. [2020-08-19 04:30:52,665 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-19 04:30:52,666 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 60 [2020-08-19 04:30:52,666 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:30:52,666 INFO L225 Difference]: With dead ends: 70 [2020-08-19 04:30:52,667 INFO L226 Difference]: Without dead ends: 64 [2020-08-19 04:30:52,667 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=353, Invalid=403, Unknown=0, NotChecked=0, Total=756 [2020-08-19 04:30:52,668 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-08-19 04:30:52,671 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2020-08-19 04:30:52,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-08-19 04:30:52,671 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 63 transitions. [2020-08-19 04:30:52,672 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 63 transitions. Word has length 60 [2020-08-19 04:30:52,672 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:30:52,672 INFO L479 AbstractCegarLoop]: Abstraction has 63 states and 63 transitions. [2020-08-19 04:30:52,672 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-19 04:30:52,672 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 63 transitions. [2020-08-19 04:30:52,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-08-19 04:30:52,673 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:30:52,673 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:30:52,673 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-19 04:30:52,673 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:30:52,674 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:30:52,675 INFO L82 PathProgramCache]: Analyzing trace with hash 614656239, now seen corresponding path program 25 times [2020-08-19 04:30:52,675 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:30:52,675 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [267324491] [2020-08-19 04:30:52,675 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:30:52,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:53,145 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:30:53,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:53,151 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:30:53,152 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [267324491] [2020-08-19 04:30:53,152 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:30:53,152 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-19 04:30:53,152 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1731546986] [2020-08-19 04:30:53,153 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-19 04:30:53,153 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:30:53,153 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-19 04:30:53,154 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=380, Invalid=432, Unknown=0, NotChecked=0, Total=812 [2020-08-19 04:30:53,154 INFO L87 Difference]: Start difference. First operand 63 states and 63 transitions. Second operand 29 states. [2020-08-19 04:30:53,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:30:53,341 INFO L93 Difference]: Finished difference Result 72 states and 72 transitions. [2020-08-19 04:30:53,342 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-19 04:30:53,342 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 62 [2020-08-19 04:30:53,342 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:30:53,343 INFO L225 Difference]: With dead ends: 72 [2020-08-19 04:30:53,343 INFO L226 Difference]: Without dead ends: 66 [2020-08-19 04:30:53,344 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=380, Invalid=432, Unknown=0, NotChecked=0, Total=812 [2020-08-19 04:30:53,345 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-08-19 04:30:53,347 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2020-08-19 04:30:53,348 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-08-19 04:30:53,348 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 65 transitions. [2020-08-19 04:30:53,348 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 65 transitions. Word has length 62 [2020-08-19 04:30:53,349 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:30:53,349 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 65 transitions. [2020-08-19 04:30:53,349 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-19 04:30:53,349 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 65 transitions. [2020-08-19 04:30:53,350 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-08-19 04:30:53,350 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:30:53,350 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:30:53,350 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-19 04:30:53,350 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:30:53,351 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:30:53,351 INFO L82 PathProgramCache]: Analyzing trace with hash 1433404433, now seen corresponding path program 26 times [2020-08-19 04:30:53,351 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:30:53,351 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1864746239] [2020-08-19 04:30:53,352 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:30:53,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:53,842 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:30:53,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:53,849 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:30:53,849 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1864746239] [2020-08-19 04:30:53,849 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:30:53,850 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-19 04:30:53,850 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1538143436] [2020-08-19 04:30:53,850 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-19 04:30:53,850 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:30:53,851 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-19 04:30:53,851 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=408, Invalid=462, Unknown=0, NotChecked=0, Total=870 [2020-08-19 04:30:53,851 INFO L87 Difference]: Start difference. First operand 65 states and 65 transitions. Second operand 30 states. [2020-08-19 04:30:53,997 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:30:53,998 INFO L93 Difference]: Finished difference Result 74 states and 74 transitions. [2020-08-19 04:30:53,998 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-19 04:30:53,998 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 64 [2020-08-19 04:30:53,999 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:30:54,000 INFO L225 Difference]: With dead ends: 74 [2020-08-19 04:30:54,000 INFO L226 Difference]: Without dead ends: 68 [2020-08-19 04:30:54,001 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=408, Invalid=462, Unknown=0, NotChecked=0, Total=870 [2020-08-19 04:30:54,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-08-19 04:30:54,004 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2020-08-19 04:30:54,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-08-19 04:30:54,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 67 transitions. [2020-08-19 04:30:54,005 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 67 transitions. Word has length 64 [2020-08-19 04:30:54,005 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:30:54,005 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 67 transitions. [2020-08-19 04:30:54,005 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-19 04:30:54,005 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 67 transitions. [2020-08-19 04:30:54,006 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-08-19 04:30:54,006 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:30:54,006 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:30:54,006 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-19 04:30:54,007 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:30:54,007 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:30:54,007 INFO L82 PathProgramCache]: Analyzing trace with hash -2023563597, now seen corresponding path program 27 times [2020-08-19 04:30:54,007 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:30:54,007 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1040061208] [2020-08-19 04:30:54,007 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:30:54,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:54,496 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:30:54,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:54,506 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:30:54,506 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1040061208] [2020-08-19 04:30:54,506 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:30:54,507 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-19 04:30:54,507 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1084077879] [2020-08-19 04:30:54,507 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-19 04:30:54,507 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:30:54,508 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-19 04:30:54,508 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=437, Invalid=493, Unknown=0, NotChecked=0, Total=930 [2020-08-19 04:30:54,508 INFO L87 Difference]: Start difference. First operand 67 states and 67 transitions. Second operand 31 states. [2020-08-19 04:30:54,725 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:30:54,726 INFO L93 Difference]: Finished difference Result 76 states and 76 transitions. [2020-08-19 04:30:54,726 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-19 04:30:54,727 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 66 [2020-08-19 04:30:54,727 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:30:54,728 INFO L225 Difference]: With dead ends: 76 [2020-08-19 04:30:54,728 INFO L226 Difference]: Without dead ends: 70 [2020-08-19 04:30:54,729 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=437, Invalid=493, Unknown=0, NotChecked=0, Total=930 [2020-08-19 04:30:54,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-08-19 04:30:54,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2020-08-19 04:30:54,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-08-19 04:30:54,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 69 transitions. [2020-08-19 04:30:54,738 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 69 transitions. Word has length 66 [2020-08-19 04:30:54,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:30:54,738 INFO L479 AbstractCegarLoop]: Abstraction has 69 states and 69 transitions. [2020-08-19 04:30:54,739 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-19 04:30:54,739 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 69 transitions. [2020-08-19 04:30:54,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-08-19 04:30:54,740 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:30:54,740 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:30:54,740 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-19 04:30:54,740 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:30:54,740 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:30:54,741 INFO L82 PathProgramCache]: Analyzing trace with hash 134846677, now seen corresponding path program 28 times [2020-08-19 04:30:54,741 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:30:54,741 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [567681479] [2020-08-19 04:30:54,741 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:30:54,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:55,419 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:30:55,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:55,428 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:30:55,428 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [567681479] [2020-08-19 04:30:55,428 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:30:55,428 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-19 04:30:55,429 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1143801920] [2020-08-19 04:30:55,429 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-19 04:30:55,429 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:30:55,430 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-19 04:30:55,430 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=467, Invalid=525, Unknown=0, NotChecked=0, Total=992 [2020-08-19 04:30:55,430 INFO L87 Difference]: Start difference. First operand 69 states and 69 transitions. Second operand 32 states. [2020-08-19 04:30:55,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:30:55,665 INFO L93 Difference]: Finished difference Result 78 states and 78 transitions. [2020-08-19 04:30:55,665 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-19 04:30:55,666 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 68 [2020-08-19 04:30:55,666 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:30:55,666 INFO L225 Difference]: With dead ends: 78 [2020-08-19 04:30:55,667 INFO L226 Difference]: Without dead ends: 72 [2020-08-19 04:30:55,668 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=467, Invalid=525, Unknown=0, NotChecked=0, Total=992 [2020-08-19 04:30:55,668 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-08-19 04:30:55,670 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2020-08-19 04:30:55,670 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-08-19 04:30:55,671 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 71 transitions. [2020-08-19 04:30:55,671 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 71 transitions. Word has length 68 [2020-08-19 04:30:55,672 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:30:55,672 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 71 transitions. [2020-08-19 04:30:55,672 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-19 04:30:55,672 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 71 transitions. [2020-08-19 04:30:55,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2020-08-19 04:30:55,673 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:30:55,674 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:30:55,674 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-19 04:30:55,674 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:30:55,675 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:30:55,675 INFO L82 PathProgramCache]: Analyzing trace with hash -102083977, now seen corresponding path program 29 times [2020-08-19 04:30:55,675 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:30:55,675 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1742920512] [2020-08-19 04:30:55,676 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:30:55,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:56,316 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:30:56,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:56,323 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:30:56,323 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1742920512] [2020-08-19 04:30:56,324 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:30:56,324 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-19 04:30:56,324 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [860220500] [2020-08-19 04:30:56,324 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-19 04:30:56,324 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:30:56,324 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-19 04:30:56,325 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=498, Invalid=558, Unknown=0, NotChecked=0, Total=1056 [2020-08-19 04:30:56,325 INFO L87 Difference]: Start difference. First operand 71 states and 71 transitions. Second operand 33 states. [2020-08-19 04:30:56,521 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:30:56,522 INFO L93 Difference]: Finished difference Result 80 states and 80 transitions. [2020-08-19 04:30:56,522 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-19 04:30:56,522 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 70 [2020-08-19 04:30:56,523 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:30:56,523 INFO L225 Difference]: With dead ends: 80 [2020-08-19 04:30:56,524 INFO L226 Difference]: Without dead ends: 74 [2020-08-19 04:30:56,525 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=498, Invalid=558, Unknown=0, NotChecked=0, Total=1056 [2020-08-19 04:30:56,526 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2020-08-19 04:30:56,528 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2020-08-19 04:30:56,528 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-08-19 04:30:56,529 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 73 transitions. [2020-08-19 04:30:56,529 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 73 transitions. Word has length 70 [2020-08-19 04:30:56,529 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:30:56,529 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 73 transitions. [2020-08-19 04:30:56,529 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-19 04:30:56,530 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 73 transitions. [2020-08-19 04:30:56,530 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-08-19 04:30:56,530 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:30:56,530 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:30:56,531 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-19 04:30:56,531 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:30:56,531 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:30:56,531 INFO L82 PathProgramCache]: Analyzing trace with hash -159175783, now seen corresponding path program 30 times [2020-08-19 04:30:56,531 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:30:56,532 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [588641794] [2020-08-19 04:30:56,532 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:30:56,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:57,128 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:30:57,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:57,137 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:30:57,137 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [588641794] [2020-08-19 04:30:57,137 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:30:57,137 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-19 04:30:57,138 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [974760517] [2020-08-19 04:30:57,138 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-19 04:30:57,138 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:30:57,139 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-19 04:30:57,139 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=530, Invalid=592, Unknown=0, NotChecked=0, Total=1122 [2020-08-19 04:30:57,140 INFO L87 Difference]: Start difference. First operand 73 states and 73 transitions. Second operand 34 states. [2020-08-19 04:30:57,356 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:30:57,357 INFO L93 Difference]: Finished difference Result 82 states and 82 transitions. [2020-08-19 04:30:57,357 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-19 04:30:57,357 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 72 [2020-08-19 04:30:57,358 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:30:57,358 INFO L225 Difference]: With dead ends: 82 [2020-08-19 04:30:57,359 INFO L226 Difference]: Without dead ends: 76 [2020-08-19 04:30:57,360 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=530, Invalid=592, Unknown=0, NotChecked=0, Total=1122 [2020-08-19 04:30:57,360 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-08-19 04:30:57,364 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2020-08-19 04:30:57,365 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-08-19 04:30:57,366 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 75 transitions. [2020-08-19 04:30:57,366 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 75 transitions. Word has length 72 [2020-08-19 04:30:57,366 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:30:57,367 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 75 transitions. [2020-08-19 04:30:57,367 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-19 04:30:57,367 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 75 transitions. [2020-08-19 04:30:57,367 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2020-08-19 04:30:57,368 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:30:57,368 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:30:57,368 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-19 04:30:57,368 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:30:57,368 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:30:57,368 INFO L82 PathProgramCache]: Analyzing trace with hash 810173499, now seen corresponding path program 31 times [2020-08-19 04:30:57,369 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:30:57,369 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1231615168] [2020-08-19 04:30:57,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:30:57,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:58,040 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:30:58,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:58,051 INFO L134 CoverageAnalysis]: Checked inductivity of 961 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:30:58,051 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1231615168] [2020-08-19 04:30:58,051 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:30:58,052 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-19 04:30:58,052 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1738497544] [2020-08-19 04:30:58,052 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-19 04:30:58,052 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:30:58,053 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-19 04:30:58,054 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=563, Invalid=627, Unknown=0, NotChecked=0, Total=1190 [2020-08-19 04:30:58,054 INFO L87 Difference]: Start difference. First operand 75 states and 75 transitions. Second operand 35 states. [2020-08-19 04:30:58,250 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:30:58,250 INFO L93 Difference]: Finished difference Result 84 states and 84 transitions. [2020-08-19 04:30:58,250 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-19 04:30:58,251 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 74 [2020-08-19 04:30:58,251 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:30:58,251 INFO L225 Difference]: With dead ends: 84 [2020-08-19 04:30:58,252 INFO L226 Difference]: Without dead ends: 78 [2020-08-19 04:30:58,253 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=563, Invalid=627, Unknown=0, NotChecked=0, Total=1190 [2020-08-19 04:30:58,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-08-19 04:30:58,257 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2020-08-19 04:30:58,257 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-08-19 04:30:58,258 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 77 transitions. [2020-08-19 04:30:58,259 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 77 transitions. Word has length 74 [2020-08-19 04:30:58,259 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:30:58,259 INFO L479 AbstractCegarLoop]: Abstraction has 77 states and 77 transitions. [2020-08-19 04:30:58,259 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-19 04:30:58,260 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 77 transitions. [2020-08-19 04:30:58,260 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2020-08-19 04:30:58,260 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:30:58,260 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:30:58,261 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-19 04:30:58,261 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:30:58,261 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:30:58,262 INFO L82 PathProgramCache]: Analyzing trace with hash 346930269, now seen corresponding path program 32 times [2020-08-19 04:30:58,262 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:30:58,262 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1776364272] [2020-08-19 04:30:58,262 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:30:58,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:58,890 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:30:58,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:58,903 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:30:58,903 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1776364272] [2020-08-19 04:30:58,903 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:30:58,903 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-19 04:30:58,904 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2022433249] [2020-08-19 04:30:58,904 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-19 04:30:58,904 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:30:58,905 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-19 04:30:58,905 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=597, Invalid=663, Unknown=0, NotChecked=0, Total=1260 [2020-08-19 04:30:58,906 INFO L87 Difference]: Start difference. First operand 77 states and 77 transitions. Second operand 36 states. [2020-08-19 04:30:59,106 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:30:59,107 INFO L93 Difference]: Finished difference Result 86 states and 86 transitions. [2020-08-19 04:30:59,107 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-19 04:30:59,107 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 76 [2020-08-19 04:30:59,108 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:30:59,109 INFO L225 Difference]: With dead ends: 86 [2020-08-19 04:30:59,109 INFO L226 Difference]: Without dead ends: 80 [2020-08-19 04:30:59,109 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=597, Invalid=663, Unknown=0, NotChecked=0, Total=1260 [2020-08-19 04:30:59,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-08-19 04:30:59,112 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 79. [2020-08-19 04:30:59,113 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-08-19 04:30:59,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 79 transitions. [2020-08-19 04:30:59,113 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 79 transitions. Word has length 76 [2020-08-19 04:30:59,114 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:30:59,114 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 79 transitions. [2020-08-19 04:30:59,114 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-19 04:30:59,114 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 79 transitions. [2020-08-19 04:30:59,114 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-08-19 04:30:59,114 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:30:59,115 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:30:59,115 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-19 04:30:59,115 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:30:59,115 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:30:59,115 INFO L82 PathProgramCache]: Analyzing trace with hash 1846785023, now seen corresponding path program 33 times [2020-08-19 04:30:59,116 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:30:59,116 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1743217413] [2020-08-19 04:30:59,116 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:30:59,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:59,804 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:30:59,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:30:59,815 INFO L134 CoverageAnalysis]: Checked inductivity of 1089 backedges. 0 proven. 1089 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:30:59,816 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1743217413] [2020-08-19 04:30:59,816 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:30:59,816 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-19 04:30:59,816 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [400329825] [2020-08-19 04:30:59,817 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-19 04:30:59,817 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:30:59,817 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-19 04:30:59,818 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=632, Invalid=700, Unknown=0, NotChecked=0, Total=1332 [2020-08-19 04:30:59,818 INFO L87 Difference]: Start difference. First operand 79 states and 79 transitions. Second operand 37 states. [2020-08-19 04:31:00,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:31:00,058 INFO L93 Difference]: Finished difference Result 88 states and 88 transitions. [2020-08-19 04:31:00,058 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-19 04:31:00,058 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 78 [2020-08-19 04:31:00,058 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:31:00,059 INFO L225 Difference]: With dead ends: 88 [2020-08-19 04:31:00,059 INFO L226 Difference]: Without dead ends: 82 [2020-08-19 04:31:00,060 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=632, Invalid=700, Unknown=0, NotChecked=0, Total=1332 [2020-08-19 04:31:00,060 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-08-19 04:31:00,062 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 81. [2020-08-19 04:31:00,062 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-08-19 04:31:00,063 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 81 transitions. [2020-08-19 04:31:00,063 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 81 transitions. Word has length 78 [2020-08-19 04:31:00,063 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:31:00,063 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 81 transitions. [2020-08-19 04:31:00,063 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-19 04:31:00,063 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 81 transitions. [2020-08-19 04:31:00,064 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-08-19 04:31:00,064 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:31:00,064 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:31:00,064 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-19 04:31:00,064 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:31:00,064 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:31:00,064 INFO L82 PathProgramCache]: Analyzing trace with hash 98192161, now seen corresponding path program 34 times [2020-08-19 04:31:00,065 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:31:00,065 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1762719954] [2020-08-19 04:31:00,065 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:31:00,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:00,858 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:31:00,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:00,867 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 0 proven. 1156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:31:00,868 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1762719954] [2020-08-19 04:31:00,868 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:31:00,868 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-19 04:31:00,868 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1849669562] [2020-08-19 04:31:00,868 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-19 04:31:00,868 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:31:00,869 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-19 04:31:00,869 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=668, Invalid=738, Unknown=0, NotChecked=0, Total=1406 [2020-08-19 04:31:00,870 INFO L87 Difference]: Start difference. First operand 81 states and 81 transitions. Second operand 38 states. [2020-08-19 04:31:01,063 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:31:01,063 INFO L93 Difference]: Finished difference Result 90 states and 90 transitions. [2020-08-19 04:31:01,064 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-19 04:31:01,064 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 80 [2020-08-19 04:31:01,064 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:31:01,065 INFO L225 Difference]: With dead ends: 90 [2020-08-19 04:31:01,065 INFO L226 Difference]: Without dead ends: 84 [2020-08-19 04:31:01,066 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=668, Invalid=738, Unknown=0, NotChecked=0, Total=1406 [2020-08-19 04:31:01,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2020-08-19 04:31:01,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 83. [2020-08-19 04:31:01,070 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2020-08-19 04:31:01,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 83 transitions. [2020-08-19 04:31:01,070 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 83 transitions. Word has length 80 [2020-08-19 04:31:01,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:31:01,071 INFO L479 AbstractCegarLoop]: Abstraction has 83 states and 83 transitions. [2020-08-19 04:31:01,071 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-19 04:31:01,071 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 83 transitions. [2020-08-19 04:31:01,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-08-19 04:31:01,072 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:31:01,072 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:31:01,072 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-19 04:31:01,072 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:31:01,072 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:31:01,073 INFO L82 PathProgramCache]: Analyzing trace with hash -967335485, now seen corresponding path program 35 times [2020-08-19 04:31:01,073 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:31:01,073 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1376433636] [2020-08-19 04:31:01,073 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:31:01,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:01,873 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:31:01,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:01,883 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:31:01,883 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1376433636] [2020-08-19 04:31:01,883 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:31:01,884 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-19 04:31:01,884 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [351325403] [2020-08-19 04:31:01,884 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-19 04:31:01,884 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:31:01,885 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-19 04:31:01,885 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=705, Invalid=777, Unknown=0, NotChecked=0, Total=1482 [2020-08-19 04:31:01,886 INFO L87 Difference]: Start difference. First operand 83 states and 83 transitions. Second operand 39 states. [2020-08-19 04:31:02,041 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:31:02,041 INFO L93 Difference]: Finished difference Result 92 states and 92 transitions. [2020-08-19 04:31:02,042 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-19 04:31:02,042 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 82 [2020-08-19 04:31:02,042 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:31:02,043 INFO L225 Difference]: With dead ends: 92 [2020-08-19 04:31:02,043 INFO L226 Difference]: Without dead ends: 86 [2020-08-19 04:31:02,044 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=705, Invalid=777, Unknown=0, NotChecked=0, Total=1482 [2020-08-19 04:31:02,045 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-08-19 04:31:02,047 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2020-08-19 04:31:02,047 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-08-19 04:31:02,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 85 transitions. [2020-08-19 04:31:02,048 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 85 transitions. Word has length 82 [2020-08-19 04:31:02,048 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:31:02,048 INFO L479 AbstractCegarLoop]: Abstraction has 85 states and 85 transitions. [2020-08-19 04:31:02,048 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-19 04:31:02,048 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 85 transitions. [2020-08-19 04:31:02,049 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2020-08-19 04:31:02,049 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:31:02,049 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:31:02,049 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-19 04:31:02,050 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:31:02,050 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:31:02,050 INFO L82 PathProgramCache]: Analyzing trace with hash 1557780453, now seen corresponding path program 36 times [2020-08-19 04:31:02,050 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:31:02,050 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [827854463] [2020-08-19 04:31:02,050 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:31:02,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:02,928 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:31:02,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:02,936 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 0 proven. 1296 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:31:02,936 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [827854463] [2020-08-19 04:31:02,937 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:31:02,937 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-19 04:31:02,937 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1917844853] [2020-08-19 04:31:02,937 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-19 04:31:02,937 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:31:02,938 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-19 04:31:02,938 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=743, Invalid=817, Unknown=0, NotChecked=0, Total=1560 [2020-08-19 04:31:02,938 INFO L87 Difference]: Start difference. First operand 85 states and 85 transitions. Second operand 40 states. [2020-08-19 04:31:03,166 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:31:03,166 INFO L93 Difference]: Finished difference Result 94 states and 94 transitions. [2020-08-19 04:31:03,168 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-19 04:31:03,168 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 84 [2020-08-19 04:31:03,169 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:31:03,169 INFO L225 Difference]: With dead ends: 94 [2020-08-19 04:31:03,169 INFO L226 Difference]: Without dead ends: 88 [2020-08-19 04:31:03,170 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=743, Invalid=817, Unknown=0, NotChecked=0, Total=1560 [2020-08-19 04:31:03,170 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-08-19 04:31:03,173 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 87. [2020-08-19 04:31:03,173 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2020-08-19 04:31:03,173 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 87 transitions. [2020-08-19 04:31:03,173 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 87 transitions. Word has length 84 [2020-08-19 04:31:03,174 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:31:03,174 INFO L479 AbstractCegarLoop]: Abstraction has 87 states and 87 transitions. [2020-08-19 04:31:03,174 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-19 04:31:03,174 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 87 transitions. [2020-08-19 04:31:03,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2020-08-19 04:31:03,175 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:31:03,175 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:31:03,175 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-19 04:31:03,175 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:31:03,175 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:31:03,175 INFO L82 PathProgramCache]: Analyzing trace with hash 1537674631, now seen corresponding path program 37 times [2020-08-19 04:31:03,175 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:31:03,176 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [674511795] [2020-08-19 04:31:03,176 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:31:03,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:04,049 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:31:04,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:04,057 INFO L134 CoverageAnalysis]: Checked inductivity of 1369 backedges. 0 proven. 1369 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:31:04,058 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [674511795] [2020-08-19 04:31:04,058 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:31:04,058 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-19 04:31:04,058 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1725767802] [2020-08-19 04:31:04,058 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-19 04:31:04,059 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:31:04,059 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-19 04:31:04,059 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=782, Invalid=858, Unknown=0, NotChecked=0, Total=1640 [2020-08-19 04:31:04,059 INFO L87 Difference]: Start difference. First operand 87 states and 87 transitions. Second operand 41 states. [2020-08-19 04:31:04,319 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:31:04,320 INFO L93 Difference]: Finished difference Result 96 states and 96 transitions. [2020-08-19 04:31:04,320 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-19 04:31:04,320 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 86 [2020-08-19 04:31:04,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:31:04,322 INFO L225 Difference]: With dead ends: 96 [2020-08-19 04:31:04,322 INFO L226 Difference]: Without dead ends: 90 [2020-08-19 04:31:04,323 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=782, Invalid=858, Unknown=0, NotChecked=0, Total=1640 [2020-08-19 04:31:04,323 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-08-19 04:31:04,326 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2020-08-19 04:31:04,326 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-08-19 04:31:04,327 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 89 transitions. [2020-08-19 04:31:04,327 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 89 transitions. Word has length 86 [2020-08-19 04:31:04,327 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:31:04,328 INFO L479 AbstractCegarLoop]: Abstraction has 89 states and 89 transitions. [2020-08-19 04:31:04,328 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-19 04:31:04,328 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 89 transitions. [2020-08-19 04:31:04,328 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2020-08-19 04:31:04,328 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:31:04,329 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:31:04,329 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-19 04:31:04,329 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:31:04,329 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:31:04,329 INFO L82 PathProgramCache]: Analyzing trace with hash -604151127, now seen corresponding path program 38 times [2020-08-19 04:31:04,329 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:31:04,330 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1812687766] [2020-08-19 04:31:04,330 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:31:04,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:05,260 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:31:05,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:05,268 INFO L134 CoverageAnalysis]: Checked inductivity of 1444 backedges. 0 proven. 1444 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:31:05,268 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1812687766] [2020-08-19 04:31:05,268 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:31:05,268 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-19 04:31:05,268 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [548613568] [2020-08-19 04:31:05,269 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-19 04:31:05,269 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:31:05,269 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-19 04:31:05,269 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=822, Invalid=900, Unknown=0, NotChecked=0, Total=1722 [2020-08-19 04:31:05,270 INFO L87 Difference]: Start difference. First operand 89 states and 89 transitions. Second operand 42 states. [2020-08-19 04:31:05,545 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:31:05,545 INFO L93 Difference]: Finished difference Result 98 states and 98 transitions. [2020-08-19 04:31:05,545 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-19 04:31:05,546 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 88 [2020-08-19 04:31:05,546 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:31:05,547 INFO L225 Difference]: With dead ends: 98 [2020-08-19 04:31:05,547 INFO L226 Difference]: Without dead ends: 92 [2020-08-19 04:31:05,548 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=822, Invalid=900, Unknown=0, NotChecked=0, Total=1722 [2020-08-19 04:31:05,549 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2020-08-19 04:31:05,551 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 91. [2020-08-19 04:31:05,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-08-19 04:31:05,552 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 91 transitions. [2020-08-19 04:31:05,552 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 91 transitions. Word has length 88 [2020-08-19 04:31:05,552 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:31:05,553 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 91 transitions. [2020-08-19 04:31:05,553 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-19 04:31:05,553 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 91 transitions. [2020-08-19 04:31:05,553 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2020-08-19 04:31:05,553 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:31:05,553 INFO L422 BasicCegarLoop]: trace histogram [39, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:31:05,554 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-19 04:31:05,554 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:31:05,554 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:31:05,554 INFO L82 PathProgramCache]: Analyzing trace with hash -1609369781, now seen corresponding path program 39 times [2020-08-19 04:31:05,554 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:31:05,554 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1473288755] [2020-08-19 04:31:05,554 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:31:05,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:06,541 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:31:06,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:06,551 INFO L134 CoverageAnalysis]: Checked inductivity of 1521 backedges. 0 proven. 1521 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:31:06,552 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1473288755] [2020-08-19 04:31:06,552 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:31:06,552 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-19 04:31:06,552 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [11955642] [2020-08-19 04:31:06,553 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-19 04:31:06,553 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:31:06,553 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-19 04:31:06,554 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=863, Invalid=943, Unknown=0, NotChecked=0, Total=1806 [2020-08-19 04:31:06,554 INFO L87 Difference]: Start difference. First operand 91 states and 91 transitions. Second operand 43 states. [2020-08-19 04:31:06,843 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:31:06,843 INFO L93 Difference]: Finished difference Result 100 states and 100 transitions. [2020-08-19 04:31:06,843 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-19 04:31:06,844 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 90 [2020-08-19 04:31:06,844 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:31:06,845 INFO L225 Difference]: With dead ends: 100 [2020-08-19 04:31:06,845 INFO L226 Difference]: Without dead ends: 94 [2020-08-19 04:31:06,847 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=863, Invalid=943, Unknown=0, NotChecked=0, Total=1806 [2020-08-19 04:31:06,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-08-19 04:31:06,860 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 93. [2020-08-19 04:31:06,860 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-08-19 04:31:06,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 93 transitions. [2020-08-19 04:31:06,862 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 93 transitions. Word has length 90 [2020-08-19 04:31:06,864 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:31:06,864 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 93 transitions. [2020-08-19 04:31:06,864 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-19 04:31:06,865 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 93 transitions. [2020-08-19 04:31:06,865 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-08-19 04:31:06,866 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:31:06,866 INFO L422 BasicCegarLoop]: trace histogram [40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:31:06,866 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-19 04:31:06,871 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:31:06,872 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:31:06,872 INFO L82 PathProgramCache]: Analyzing trace with hash -1256854675, now seen corresponding path program 40 times [2020-08-19 04:31:06,872 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:31:06,873 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1595392738] [2020-08-19 04:31:06,873 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:31:06,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:08,216 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:31:08,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:08,235 INFO L134 CoverageAnalysis]: Checked inductivity of 1600 backedges. 0 proven. 1600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:31:08,235 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1595392738] [2020-08-19 04:31:08,235 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:31:08,236 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-08-19 04:31:08,236 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1878264611] [2020-08-19 04:31:08,236 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-08-19 04:31:08,237 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:31:08,237 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-08-19 04:31:08,238 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=905, Invalid=987, Unknown=0, NotChecked=0, Total=1892 [2020-08-19 04:31:08,239 INFO L87 Difference]: Start difference. First operand 93 states and 93 transitions. Second operand 44 states. [2020-08-19 04:31:08,482 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:31:08,482 INFO L93 Difference]: Finished difference Result 102 states and 102 transitions. [2020-08-19 04:31:08,483 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-08-19 04:31:08,483 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 92 [2020-08-19 04:31:08,484 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:31:08,484 INFO L225 Difference]: With dead ends: 102 [2020-08-19 04:31:08,484 INFO L226 Difference]: Without dead ends: 96 [2020-08-19 04:31:08,486 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=905, Invalid=987, Unknown=0, NotChecked=0, Total=1892 [2020-08-19 04:31:08,486 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-08-19 04:31:08,489 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2020-08-19 04:31:08,490 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2020-08-19 04:31:08,491 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 95 transitions. [2020-08-19 04:31:08,491 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 95 transitions. Word has length 92 [2020-08-19 04:31:08,491 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:31:08,491 INFO L479 AbstractCegarLoop]: Abstraction has 95 states and 95 transitions. [2020-08-19 04:31:08,492 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-08-19 04:31:08,492 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 95 transitions. [2020-08-19 04:31:08,493 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2020-08-19 04:31:08,493 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:31:08,493 INFO L422 BasicCegarLoop]: trace histogram [41, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:31:08,493 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-19 04:31:08,493 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:31:08,494 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:31:08,495 INFO L82 PathProgramCache]: Analyzing trace with hash -1792254193, now seen corresponding path program 41 times [2020-08-19 04:31:08,495 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:31:08,495 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [318740588] [2020-08-19 04:31:08,495 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:31:08,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:09,574 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:31:09,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:09,585 INFO L134 CoverageAnalysis]: Checked inductivity of 1681 backedges. 0 proven. 1681 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:31:09,586 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [318740588] [2020-08-19 04:31:09,586 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:31:09,586 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-08-19 04:31:09,586 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1777293216] [2020-08-19 04:31:09,587 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-08-19 04:31:09,587 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:31:09,587 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-08-19 04:31:09,588 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=948, Invalid=1032, Unknown=0, NotChecked=0, Total=1980 [2020-08-19 04:31:09,588 INFO L87 Difference]: Start difference. First operand 95 states and 95 transitions. Second operand 45 states. [2020-08-19 04:31:09,862 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:31:09,862 INFO L93 Difference]: Finished difference Result 104 states and 104 transitions. [2020-08-19 04:31:09,863 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-08-19 04:31:09,863 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 94 [2020-08-19 04:31:09,863 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:31:09,864 INFO L225 Difference]: With dead ends: 104 [2020-08-19 04:31:09,864 INFO L226 Difference]: Without dead ends: 98 [2020-08-19 04:31:09,865 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=948, Invalid=1032, Unknown=0, NotChecked=0, Total=1980 [2020-08-19 04:31:09,865 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-08-19 04:31:09,872 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 97. [2020-08-19 04:31:09,872 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2020-08-19 04:31:09,873 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 97 transitions. [2020-08-19 04:31:09,873 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 97 transitions. Word has length 94 [2020-08-19 04:31:09,874 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:31:09,876 INFO L479 AbstractCegarLoop]: Abstraction has 97 states and 97 transitions. [2020-08-19 04:31:09,876 INFO L480 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-08-19 04:31:09,877 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 97 transitions. [2020-08-19 04:31:09,877 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-08-19 04:31:09,878 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:31:09,878 INFO L422 BasicCegarLoop]: trace histogram [42, 42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:31:09,878 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2020-08-19 04:31:09,878 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:31:09,878 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:31:09,879 INFO L82 PathProgramCache]: Analyzing trace with hash -915115471, now seen corresponding path program 42 times [2020-08-19 04:31:09,879 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:31:09,879 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1896870722] [2020-08-19 04:31:09,879 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:31:09,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:10,964 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:31:10,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:10,974 INFO L134 CoverageAnalysis]: Checked inductivity of 1764 backedges. 0 proven. 1764 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:31:10,974 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1896870722] [2020-08-19 04:31:10,974 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:31:10,974 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46] total 46 [2020-08-19 04:31:10,974 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [15971430] [2020-08-19 04:31:10,975 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-08-19 04:31:10,975 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:31:10,975 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-08-19 04:31:10,976 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=992, Invalid=1078, Unknown=0, NotChecked=0, Total=2070 [2020-08-19 04:31:10,976 INFO L87 Difference]: Start difference. First operand 97 states and 97 transitions. Second operand 46 states. [2020-08-19 04:31:11,173 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:31:11,174 INFO L93 Difference]: Finished difference Result 106 states and 106 transitions. [2020-08-19 04:31:11,174 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-08-19 04:31:11,174 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 96 [2020-08-19 04:31:11,175 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:31:11,176 INFO L225 Difference]: With dead ends: 106 [2020-08-19 04:31:11,176 INFO L226 Difference]: Without dead ends: 100 [2020-08-19 04:31:11,177 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=992, Invalid=1078, Unknown=0, NotChecked=0, Total=2070 [2020-08-19 04:31:11,178 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-08-19 04:31:11,180 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 99. [2020-08-19 04:31:11,180 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2020-08-19 04:31:11,181 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 99 transitions. [2020-08-19 04:31:11,181 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 99 transitions. Word has length 96 [2020-08-19 04:31:11,181 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:31:11,181 INFO L479 AbstractCegarLoop]: Abstraction has 99 states and 99 transitions. [2020-08-19 04:31:11,181 INFO L480 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-08-19 04:31:11,182 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 99 transitions. [2020-08-19 04:31:11,182 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2020-08-19 04:31:11,182 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:31:11,182 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:31:11,182 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2020-08-19 04:31:11,183 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:31:11,183 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:31:11,183 INFO L82 PathProgramCache]: Analyzing trace with hash 201606355, now seen corresponding path program 43 times [2020-08-19 04:31:11,183 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:31:11,183 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1042120150] [2020-08-19 04:31:11,183 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:31:11,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:12,315 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:31:12,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:12,325 INFO L134 CoverageAnalysis]: Checked inductivity of 1849 backedges. 0 proven. 1849 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:31:12,325 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1042120150] [2020-08-19 04:31:12,325 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:31:12,326 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47] total 47 [2020-08-19 04:31:12,326 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1464018347] [2020-08-19 04:31:12,326 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-08-19 04:31:12,326 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:31:12,326 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-08-19 04:31:12,327 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1037, Invalid=1125, Unknown=0, NotChecked=0, Total=2162 [2020-08-19 04:31:12,327 INFO L87 Difference]: Start difference. First operand 99 states and 99 transitions. Second operand 47 states. [2020-08-19 04:31:12,623 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:31:12,624 INFO L93 Difference]: Finished difference Result 108 states and 108 transitions. [2020-08-19 04:31:12,624 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2020-08-19 04:31:12,624 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 98 [2020-08-19 04:31:12,625 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:31:12,625 INFO L225 Difference]: With dead ends: 108 [2020-08-19 04:31:12,625 INFO L226 Difference]: Without dead ends: 102 [2020-08-19 04:31:12,627 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1037, Invalid=1125, Unknown=0, NotChecked=0, Total=2162 [2020-08-19 04:31:12,628 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2020-08-19 04:31:12,631 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 101. [2020-08-19 04:31:12,631 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2020-08-19 04:31:12,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 101 transitions. [2020-08-19 04:31:12,632 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 101 transitions. Word has length 98 [2020-08-19 04:31:12,633 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:31:12,633 INFO L479 AbstractCegarLoop]: Abstraction has 101 states and 101 transitions. [2020-08-19 04:31:12,633 INFO L480 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-08-19 04:31:12,633 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 101 transitions. [2020-08-19 04:31:12,634 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2020-08-19 04:31:12,634 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:31:12,634 INFO L422 BasicCegarLoop]: trace histogram [44, 44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:31:12,634 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2020-08-19 04:31:12,635 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:31:12,635 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:31:12,635 INFO L82 PathProgramCache]: Analyzing trace with hash -370542859, now seen corresponding path program 44 times [2020-08-19 04:31:12,635 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:31:12,635 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [554604484] [2020-08-19 04:31:12,636 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:31:12,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:13,852 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:31:13,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:13,862 INFO L134 CoverageAnalysis]: Checked inductivity of 1936 backedges. 0 proven. 1936 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:31:13,863 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [554604484] [2020-08-19 04:31:13,863 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:31:13,863 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48] total 48 [2020-08-19 04:31:13,863 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [268532472] [2020-08-19 04:31:13,863 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-08-19 04:31:13,863 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:31:13,864 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-08-19 04:31:13,864 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1083, Invalid=1173, Unknown=0, NotChecked=0, Total=2256 [2020-08-19 04:31:13,864 INFO L87 Difference]: Start difference. First operand 101 states and 101 transitions. Second operand 48 states. [2020-08-19 04:31:14,096 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:31:14,096 INFO L93 Difference]: Finished difference Result 110 states and 110 transitions. [2020-08-19 04:31:14,096 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-08-19 04:31:14,097 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 100 [2020-08-19 04:31:14,097 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:31:14,098 INFO L225 Difference]: With dead ends: 110 [2020-08-19 04:31:14,098 INFO L226 Difference]: Without dead ends: 104 [2020-08-19 04:31:14,099 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1083, Invalid=1173, Unknown=0, NotChecked=0, Total=2256 [2020-08-19 04:31:14,099 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2020-08-19 04:31:14,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 103. [2020-08-19 04:31:14,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-08-19 04:31:14,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 103 transitions. [2020-08-19 04:31:14,104 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 103 transitions. Word has length 100 [2020-08-19 04:31:14,106 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:31:14,107 INFO L479 AbstractCegarLoop]: Abstraction has 103 states and 103 transitions. [2020-08-19 04:31:14,107 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-08-19 04:31:14,107 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 103 transitions. [2020-08-19 04:31:14,107 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2020-08-19 04:31:14,108 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:31:14,108 INFO L422 BasicCegarLoop]: trace histogram [45, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:31:14,108 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2020-08-19 04:31:14,108 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:31:14,108 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:31:14,109 INFO L82 PathProgramCache]: Analyzing trace with hash -450123625, now seen corresponding path program 45 times [2020-08-19 04:31:14,109 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:31:14,109 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [509643087] [2020-08-19 04:31:14,109 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:31:14,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:15,346 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:31:15,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:15,356 INFO L134 CoverageAnalysis]: Checked inductivity of 2025 backedges. 0 proven. 2025 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:31:15,356 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [509643087] [2020-08-19 04:31:15,356 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:31:15,356 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49] total 49 [2020-08-19 04:31:15,357 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2142610057] [2020-08-19 04:31:15,357 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2020-08-19 04:31:15,357 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:31:15,357 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2020-08-19 04:31:15,357 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1130, Invalid=1222, Unknown=0, NotChecked=0, Total=2352 [2020-08-19 04:31:15,357 INFO L87 Difference]: Start difference. First operand 103 states and 103 transitions. Second operand 49 states. [2020-08-19 04:31:15,555 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:31:15,555 INFO L93 Difference]: Finished difference Result 112 states and 112 transitions. [2020-08-19 04:31:15,555 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2020-08-19 04:31:15,556 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 102 [2020-08-19 04:31:15,556 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:31:15,557 INFO L225 Difference]: With dead ends: 112 [2020-08-19 04:31:15,557 INFO L226 Difference]: Without dead ends: 106 [2020-08-19 04:31:15,558 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1130, Invalid=1222, Unknown=0, NotChecked=0, Total=2352 [2020-08-19 04:31:15,559 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-08-19 04:31:15,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 105. [2020-08-19 04:31:15,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2020-08-19 04:31:15,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 105 transitions. [2020-08-19 04:31:15,562 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 105 transitions. Word has length 102 [2020-08-19 04:31:15,562 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:31:15,562 INFO L479 AbstractCegarLoop]: Abstraction has 105 states and 105 transitions. [2020-08-19 04:31:15,562 INFO L480 AbstractCegarLoop]: Interpolant automaton has 49 states. [2020-08-19 04:31:15,562 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 105 transitions. [2020-08-19 04:31:15,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2020-08-19 04:31:15,563 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:31:15,563 INFO L422 BasicCegarLoop]: trace histogram [46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:31:15,563 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2020-08-19 04:31:15,563 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:31:15,563 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:31:15,563 INFO L82 PathProgramCache]: Analyzing trace with hash 382171577, now seen corresponding path program 46 times [2020-08-19 04:31:15,564 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:31:15,564 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1103153623] [2020-08-19 04:31:15,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:31:15,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:16,884 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:31:16,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:16,896 INFO L134 CoverageAnalysis]: Checked inductivity of 2116 backedges. 0 proven. 2116 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:31:16,896 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1103153623] [2020-08-19 04:31:16,897 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:31:16,897 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50] total 50 [2020-08-19 04:31:16,897 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1122831458] [2020-08-19 04:31:16,897 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-08-19 04:31:16,897 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:31:16,898 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-08-19 04:31:16,898 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1178, Invalid=1272, Unknown=0, NotChecked=0, Total=2450 [2020-08-19 04:31:16,898 INFO L87 Difference]: Start difference. First operand 105 states and 105 transitions. Second operand 50 states. [2020-08-19 04:31:17,094 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:31:17,094 INFO L93 Difference]: Finished difference Result 114 states and 114 transitions. [2020-08-19 04:31:17,095 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2020-08-19 04:31:17,095 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 104 [2020-08-19 04:31:17,095 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:31:17,096 INFO L225 Difference]: With dead ends: 114 [2020-08-19 04:31:17,096 INFO L226 Difference]: Without dead ends: 108 [2020-08-19 04:31:17,097 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1178, Invalid=1272, Unknown=0, NotChecked=0, Total=2450 [2020-08-19 04:31:17,098 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-08-19 04:31:17,104 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 107. [2020-08-19 04:31:17,104 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-08-19 04:31:17,105 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 107 transitions. [2020-08-19 04:31:17,105 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 107 transitions. Word has length 104 [2020-08-19 04:31:17,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:31:17,105 INFO L479 AbstractCegarLoop]: Abstraction has 107 states and 107 transitions. [2020-08-19 04:31:17,105 INFO L480 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-08-19 04:31:17,105 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 107 transitions. [2020-08-19 04:31:17,106 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2020-08-19 04:31:17,106 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:31:17,106 INFO L422 BasicCegarLoop]: trace histogram [47, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:31:17,106 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2020-08-19 04:31:17,106 INFO L427 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:31:17,107 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:31:17,107 INFO L82 PathProgramCache]: Analyzing trace with hash 1353943643, now seen corresponding path program 47 times [2020-08-19 04:31:17,107 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:31:17,107 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1883998961] [2020-08-19 04:31:17,107 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:31:17,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:18,461 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:31:18,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:18,472 INFO L134 CoverageAnalysis]: Checked inductivity of 2209 backedges. 0 proven. 2209 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:31:18,473 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1883998961] [2020-08-19 04:31:18,473 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:31:18,473 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51] total 51 [2020-08-19 04:31:18,473 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1268770785] [2020-08-19 04:31:18,473 INFO L459 AbstractCegarLoop]: Interpolant automaton has 51 states [2020-08-19 04:31:18,474 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:31:18,474 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2020-08-19 04:31:18,474 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1227, Invalid=1323, Unknown=0, NotChecked=0, Total=2550 [2020-08-19 04:31:18,474 INFO L87 Difference]: Start difference. First operand 107 states and 107 transitions. Second operand 51 states. [2020-08-19 04:31:18,692 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:31:18,693 INFO L93 Difference]: Finished difference Result 116 states and 116 transitions. [2020-08-19 04:31:18,693 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2020-08-19 04:31:18,693 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 106 [2020-08-19 04:31:18,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:31:18,695 INFO L225 Difference]: With dead ends: 116 [2020-08-19 04:31:18,695 INFO L226 Difference]: Without dead ends: 110 [2020-08-19 04:31:18,696 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1227, Invalid=1323, Unknown=0, NotChecked=0, Total=2550 [2020-08-19 04:31:18,696 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2020-08-19 04:31:18,700 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 109. [2020-08-19 04:31:18,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 109 states. [2020-08-19 04:31:18,700 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 109 transitions. [2020-08-19 04:31:18,701 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 109 transitions. Word has length 106 [2020-08-19 04:31:18,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:31:18,701 INFO L479 AbstractCegarLoop]: Abstraction has 109 states and 109 transitions. [2020-08-19 04:31:18,701 INFO L480 AbstractCegarLoop]: Interpolant automaton has 51 states. [2020-08-19 04:31:18,701 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 109 transitions. [2020-08-19 04:31:18,702 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2020-08-19 04:31:18,702 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:31:18,702 INFO L422 BasicCegarLoop]: trace histogram [48, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:31:18,702 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48 [2020-08-19 04:31:18,702 INFO L427 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:31:18,703 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:31:18,703 INFO L82 PathProgramCache]: Analyzing trace with hash -1075971459, now seen corresponding path program 48 times [2020-08-19 04:31:18,703 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:31:18,703 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2089586695] [2020-08-19 04:31:18,703 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:31:18,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:20,133 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:31:20,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:20,145 INFO L134 CoverageAnalysis]: Checked inductivity of 2304 backedges. 0 proven. 2304 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:31:20,145 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2089586695] [2020-08-19 04:31:20,145 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:31:20,145 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52] total 52 [2020-08-19 04:31:20,145 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [433844700] [2020-08-19 04:31:20,146 INFO L459 AbstractCegarLoop]: Interpolant automaton has 52 states [2020-08-19 04:31:20,146 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:31:20,146 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2020-08-19 04:31:20,147 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1277, Invalid=1375, Unknown=0, NotChecked=0, Total=2652 [2020-08-19 04:31:20,147 INFO L87 Difference]: Start difference. First operand 109 states and 109 transitions. Second operand 52 states. [2020-08-19 04:31:20,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:31:20,368 INFO L93 Difference]: Finished difference Result 118 states and 118 transitions. [2020-08-19 04:31:20,368 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2020-08-19 04:31:20,368 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 108 [2020-08-19 04:31:20,369 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:31:20,370 INFO L225 Difference]: With dead ends: 118 [2020-08-19 04:31:20,370 INFO L226 Difference]: Without dead ends: 112 [2020-08-19 04:31:20,371 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1277, Invalid=1375, Unknown=0, NotChecked=0, Total=2652 [2020-08-19 04:31:20,372 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2020-08-19 04:31:20,374 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 111. [2020-08-19 04:31:20,374 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 111 states. [2020-08-19 04:31:20,375 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 111 transitions. [2020-08-19 04:31:20,375 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 111 transitions. Word has length 108 [2020-08-19 04:31:20,375 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:31:20,376 INFO L479 AbstractCegarLoop]: Abstraction has 111 states and 111 transitions. [2020-08-19 04:31:20,376 INFO L480 AbstractCegarLoop]: Interpolant automaton has 52 states. [2020-08-19 04:31:20,376 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 111 transitions. [2020-08-19 04:31:20,376 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2020-08-19 04:31:20,376 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:31:20,377 INFO L422 BasicCegarLoop]: trace histogram [49, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:31:20,377 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable49 [2020-08-19 04:31:20,377 INFO L427 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:31:20,377 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:31:20,377 INFO L82 PathProgramCache]: Analyzing trace with hash 237824543, now seen corresponding path program 49 times [2020-08-19 04:31:20,377 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:31:20,378 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [701099417] [2020-08-19 04:31:20,378 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:31:20,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:21,814 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:31:21,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:21,828 INFO L134 CoverageAnalysis]: Checked inductivity of 2401 backedges. 0 proven. 2401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:31:21,829 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [701099417] [2020-08-19 04:31:21,829 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:31:21,829 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53] total 53 [2020-08-19 04:31:21,829 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1571240656] [2020-08-19 04:31:21,830 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2020-08-19 04:31:21,830 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:31:21,830 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2020-08-19 04:31:21,831 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1328, Invalid=1428, Unknown=0, NotChecked=0, Total=2756 [2020-08-19 04:31:21,831 INFO L87 Difference]: Start difference. First operand 111 states and 111 transitions. Second operand 53 states. [2020-08-19 04:31:22,104 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:31:22,104 INFO L93 Difference]: Finished difference Result 120 states and 120 transitions. [2020-08-19 04:31:22,104 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2020-08-19 04:31:22,105 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 110 [2020-08-19 04:31:22,105 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:31:22,107 INFO L225 Difference]: With dead ends: 120 [2020-08-19 04:31:22,108 INFO L226 Difference]: Without dead ends: 114 [2020-08-19 04:31:22,108 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1328, Invalid=1428, Unknown=0, NotChecked=0, Total=2756 [2020-08-19 04:31:22,109 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2020-08-19 04:31:22,111 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 113. [2020-08-19 04:31:22,112 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 113 states. [2020-08-19 04:31:22,112 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 113 transitions. [2020-08-19 04:31:22,112 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 113 transitions. Word has length 110 [2020-08-19 04:31:22,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:31:22,113 INFO L479 AbstractCegarLoop]: Abstraction has 113 states and 113 transitions. [2020-08-19 04:31:22,113 INFO L480 AbstractCegarLoop]: Interpolant automaton has 53 states. [2020-08-19 04:31:22,113 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 113 transitions. [2020-08-19 04:31:22,114 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2020-08-19 04:31:22,114 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:31:22,114 INFO L422 BasicCegarLoop]: trace histogram [50, 50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:31:22,114 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50 [2020-08-19 04:31:22,114 INFO L427 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:31:22,115 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:31:22,115 INFO L82 PathProgramCache]: Analyzing trace with hash 75397441, now seen corresponding path program 50 times [2020-08-19 04:31:22,115 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:31:22,115 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [671061262] [2020-08-19 04:31:22,115 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:31:22,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:23,716 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:31:23,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:23,729 INFO L134 CoverageAnalysis]: Checked inductivity of 2500 backedges. 0 proven. 2500 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:31:23,729 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [671061262] [2020-08-19 04:31:23,729 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:31:23,729 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54] total 54 [2020-08-19 04:31:23,729 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [507566959] [2020-08-19 04:31:23,733 INFO L459 AbstractCegarLoop]: Interpolant automaton has 54 states [2020-08-19 04:31:23,733 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:31:23,733 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2020-08-19 04:31:23,734 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1380, Invalid=1482, Unknown=0, NotChecked=0, Total=2862 [2020-08-19 04:31:23,734 INFO L87 Difference]: Start difference. First operand 113 states and 113 transitions. Second operand 54 states. [2020-08-19 04:31:24,070 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:31:24,070 INFO L93 Difference]: Finished difference Result 122 states and 122 transitions. [2020-08-19 04:31:24,071 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2020-08-19 04:31:24,071 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 112 [2020-08-19 04:31:24,071 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:31:24,072 INFO L225 Difference]: With dead ends: 122 [2020-08-19 04:31:24,072 INFO L226 Difference]: Without dead ends: 116 [2020-08-19 04:31:24,073 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1380, Invalid=1482, Unknown=0, NotChecked=0, Total=2862 [2020-08-19 04:31:24,073 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2020-08-19 04:31:24,076 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 115. [2020-08-19 04:31:24,076 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2020-08-19 04:31:24,077 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 115 transitions. [2020-08-19 04:31:24,077 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 115 transitions. Word has length 112 [2020-08-19 04:31:24,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:31:24,077 INFO L479 AbstractCegarLoop]: Abstraction has 115 states and 115 transitions. [2020-08-19 04:31:24,077 INFO L480 AbstractCegarLoop]: Interpolant automaton has 54 states. [2020-08-19 04:31:24,077 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 115 transitions. [2020-08-19 04:31:24,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2020-08-19 04:31:24,078 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:31:24,078 INFO L422 BasicCegarLoop]: trace histogram [51, 51, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:31:24,079 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51 [2020-08-19 04:31:24,079 INFO L427 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:31:24,079 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:31:24,079 INFO L82 PathProgramCache]: Analyzing trace with hash -1398224925, now seen corresponding path program 51 times [2020-08-19 04:31:24,079 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:31:24,079 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1500515387] [2020-08-19 04:31:24,080 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:31:24,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:25,690 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:31:25,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:25,702 INFO L134 CoverageAnalysis]: Checked inductivity of 2601 backedges. 0 proven. 2601 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:31:25,702 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1500515387] [2020-08-19 04:31:25,702 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:31:25,702 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55] total 55 [2020-08-19 04:31:25,702 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [996288241] [2020-08-19 04:31:25,703 INFO L459 AbstractCegarLoop]: Interpolant automaton has 55 states [2020-08-19 04:31:25,703 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:31:25,703 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2020-08-19 04:31:25,703 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1433, Invalid=1537, Unknown=0, NotChecked=0, Total=2970 [2020-08-19 04:31:25,704 INFO L87 Difference]: Start difference. First operand 115 states and 115 transitions. Second operand 55 states. [2020-08-19 04:31:26,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:31:26,057 INFO L93 Difference]: Finished difference Result 124 states and 124 transitions. [2020-08-19 04:31:26,057 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2020-08-19 04:31:26,058 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 114 [2020-08-19 04:31:26,058 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:31:26,059 INFO L225 Difference]: With dead ends: 124 [2020-08-19 04:31:26,059 INFO L226 Difference]: Without dead ends: 118 [2020-08-19 04:31:26,060 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1433, Invalid=1537, Unknown=0, NotChecked=0, Total=2970 [2020-08-19 04:31:26,060 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-08-19 04:31:26,063 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 117. [2020-08-19 04:31:26,063 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 117 states. [2020-08-19 04:31:26,063 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 117 transitions. [2020-08-19 04:31:26,064 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 117 transitions. Word has length 114 [2020-08-19 04:31:26,064 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:31:26,064 INFO L479 AbstractCegarLoop]: Abstraction has 117 states and 117 transitions. [2020-08-19 04:31:26,064 INFO L480 AbstractCegarLoop]: Interpolant automaton has 55 states. [2020-08-19 04:31:26,064 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 117 transitions. [2020-08-19 04:31:26,065 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2020-08-19 04:31:26,065 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:31:26,065 INFO L422 BasicCegarLoop]: trace histogram [52, 52, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:31:26,065 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52 [2020-08-19 04:31:26,066 INFO L427 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:31:26,066 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:31:26,066 INFO L82 PathProgramCache]: Analyzing trace with hash -210110971, now seen corresponding path program 52 times [2020-08-19 04:31:26,066 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:31:26,066 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1850826697] [2020-08-19 04:31:26,066 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:31:26,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:27,731 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:31:27,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:27,743 INFO L134 CoverageAnalysis]: Checked inductivity of 2704 backedges. 0 proven. 2704 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:31:27,743 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1850826697] [2020-08-19 04:31:27,743 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:31:27,743 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56] total 56 [2020-08-19 04:31:27,744 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1385728378] [2020-08-19 04:31:27,744 INFO L459 AbstractCegarLoop]: Interpolant automaton has 56 states [2020-08-19 04:31:27,744 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:31:27,744 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2020-08-19 04:31:27,745 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1487, Invalid=1593, Unknown=0, NotChecked=0, Total=3080 [2020-08-19 04:31:27,745 INFO L87 Difference]: Start difference. First operand 117 states and 117 transitions. Second operand 56 states. [2020-08-19 04:31:28,160 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:31:28,160 INFO L93 Difference]: Finished difference Result 126 states and 126 transitions. [2020-08-19 04:31:28,161 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2020-08-19 04:31:28,161 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 116 [2020-08-19 04:31:28,161 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:31:28,162 INFO L225 Difference]: With dead ends: 126 [2020-08-19 04:31:28,162 INFO L226 Difference]: Without dead ends: 120 [2020-08-19 04:31:28,163 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1487, Invalid=1593, Unknown=0, NotChecked=0, Total=3080 [2020-08-19 04:31:28,163 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2020-08-19 04:31:28,168 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 119. [2020-08-19 04:31:28,168 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 119 states. [2020-08-19 04:31:28,169 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 119 transitions. [2020-08-19 04:31:28,170 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 119 transitions. Word has length 116 [2020-08-19 04:31:28,170 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:31:28,170 INFO L479 AbstractCegarLoop]: Abstraction has 119 states and 119 transitions. [2020-08-19 04:31:28,170 INFO L480 AbstractCegarLoop]: Interpolant automaton has 56 states. [2020-08-19 04:31:28,171 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 119 transitions. [2020-08-19 04:31:28,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2020-08-19 04:31:28,172 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:31:28,172 INFO L422 BasicCegarLoop]: trace histogram [53, 53, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:31:28,173 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53 [2020-08-19 04:31:28,173 INFO L427 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:31:28,173 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:31:28,173 INFO L82 PathProgramCache]: Analyzing trace with hash -893901913, now seen corresponding path program 53 times [2020-08-19 04:31:28,173 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:31:28,173 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1718226378] [2020-08-19 04:31:28,173 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:31:28,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:29,902 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:31:29,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:29,915 INFO L134 CoverageAnalysis]: Checked inductivity of 2809 backedges. 0 proven. 2809 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:31:29,915 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1718226378] [2020-08-19 04:31:29,916 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:31:29,916 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57] total 57 [2020-08-19 04:31:29,916 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1449390746] [2020-08-19 04:31:29,917 INFO L459 AbstractCegarLoop]: Interpolant automaton has 57 states [2020-08-19 04:31:29,917 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:31:29,917 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2020-08-19 04:31:29,917 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1542, Invalid=1650, Unknown=0, NotChecked=0, Total=3192 [2020-08-19 04:31:29,918 INFO L87 Difference]: Start difference. First operand 119 states and 119 transitions. Second operand 57 states. [2020-08-19 04:31:30,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:31:30,210 INFO L93 Difference]: Finished difference Result 128 states and 128 transitions. [2020-08-19 04:31:30,210 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2020-08-19 04:31:30,211 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 118 [2020-08-19 04:31:30,211 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:31:30,212 INFO L225 Difference]: With dead ends: 128 [2020-08-19 04:31:30,212 INFO L226 Difference]: Without dead ends: 122 [2020-08-19 04:31:30,213 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1542, Invalid=1650, Unknown=0, NotChecked=0, Total=3192 [2020-08-19 04:31:30,213 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2020-08-19 04:31:30,216 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 121. [2020-08-19 04:31:30,217 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 121 states. [2020-08-19 04:31:30,217 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 121 transitions. [2020-08-19 04:31:30,217 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 121 transitions. Word has length 118 [2020-08-19 04:31:30,217 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:31:30,218 INFO L479 AbstractCegarLoop]: Abstraction has 121 states and 121 transitions. [2020-08-19 04:31:30,218 INFO L480 AbstractCegarLoop]: Interpolant automaton has 57 states. [2020-08-19 04:31:30,218 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 121 transitions. [2020-08-19 04:31:30,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2020-08-19 04:31:30,218 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:31:30,219 INFO L422 BasicCegarLoop]: trace histogram [54, 54, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:31:30,219 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54 [2020-08-19 04:31:30,219 INFO L427 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:31:30,219 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:31:30,219 INFO L82 PathProgramCache]: Analyzing trace with hash -887000887, now seen corresponding path program 54 times [2020-08-19 04:31:30,220 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:31:30,220 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [988628686] [2020-08-19 04:31:30,220 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:31:30,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:32,033 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:31:32,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:32,046 INFO L134 CoverageAnalysis]: Checked inductivity of 2916 backedges. 0 proven. 2916 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:31:32,047 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [988628686] [2020-08-19 04:31:32,047 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:31:32,047 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58] total 58 [2020-08-19 04:31:32,047 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [400910456] [2020-08-19 04:31:32,047 INFO L459 AbstractCegarLoop]: Interpolant automaton has 58 states [2020-08-19 04:31:32,048 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:31:32,048 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2020-08-19 04:31:32,048 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1598, Invalid=1708, Unknown=0, NotChecked=0, Total=3306 [2020-08-19 04:31:32,048 INFO L87 Difference]: Start difference. First operand 121 states and 121 transitions. Second operand 58 states. [2020-08-19 04:31:32,426 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:31:32,426 INFO L93 Difference]: Finished difference Result 130 states and 130 transitions. [2020-08-19 04:31:32,427 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2020-08-19 04:31:32,427 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 120 [2020-08-19 04:31:32,427 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:31:32,428 INFO L225 Difference]: With dead ends: 130 [2020-08-19 04:31:32,428 INFO L226 Difference]: Without dead ends: 124 [2020-08-19 04:31:32,429 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1598, Invalid=1708, Unknown=0, NotChecked=0, Total=3306 [2020-08-19 04:31:32,429 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2020-08-19 04:31:32,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 123. [2020-08-19 04:31:32,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 123 states. [2020-08-19 04:31:32,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 123 transitions. [2020-08-19 04:31:32,433 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 123 transitions. Word has length 120 [2020-08-19 04:31:32,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:31:32,433 INFO L479 AbstractCegarLoop]: Abstraction has 123 states and 123 transitions. [2020-08-19 04:31:32,433 INFO L480 AbstractCegarLoop]: Interpolant automaton has 58 states. [2020-08-19 04:31:32,433 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 123 transitions. [2020-08-19 04:31:32,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2020-08-19 04:31:32,434 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:31:32,434 INFO L422 BasicCegarLoop]: trace histogram [55, 55, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:31:32,434 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable55 [2020-08-19 04:31:32,435 INFO L427 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:31:32,435 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:31:32,435 INFO L82 PathProgramCache]: Analyzing trace with hash 1449917803, now seen corresponding path program 55 times [2020-08-19 04:31:32,435 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:31:32,435 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1074420910] [2020-08-19 04:31:32,435 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:31:32,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:34,339 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:31:34,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:34,352 INFO L134 CoverageAnalysis]: Checked inductivity of 3025 backedges. 0 proven. 3025 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:31:34,352 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1074420910] [2020-08-19 04:31:34,352 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:31:34,353 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59] total 59 [2020-08-19 04:31:34,353 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [421073330] [2020-08-19 04:31:34,353 INFO L459 AbstractCegarLoop]: Interpolant automaton has 59 states [2020-08-19 04:31:34,353 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:31:34,354 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2020-08-19 04:31:34,354 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1655, Invalid=1767, Unknown=0, NotChecked=0, Total=3422 [2020-08-19 04:31:34,354 INFO L87 Difference]: Start difference. First operand 123 states and 123 transitions. Second operand 59 states. [2020-08-19 04:31:34,593 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:31:34,594 INFO L93 Difference]: Finished difference Result 132 states and 132 transitions. [2020-08-19 04:31:34,594 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2020-08-19 04:31:34,594 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 122 [2020-08-19 04:31:34,595 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:31:34,595 INFO L225 Difference]: With dead ends: 132 [2020-08-19 04:31:34,596 INFO L226 Difference]: Without dead ends: 126 [2020-08-19 04:31:34,596 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1655, Invalid=1767, Unknown=0, NotChecked=0, Total=3422 [2020-08-19 04:31:34,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2020-08-19 04:31:34,600 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 125. [2020-08-19 04:31:34,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 125 states. [2020-08-19 04:31:34,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 125 transitions. [2020-08-19 04:31:34,601 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 125 transitions. Word has length 122 [2020-08-19 04:31:34,601 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:31:34,601 INFO L479 AbstractCegarLoop]: Abstraction has 125 states and 125 transitions. [2020-08-19 04:31:34,601 INFO L480 AbstractCegarLoop]: Interpolant automaton has 59 states. [2020-08-19 04:31:34,601 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 125 transitions. [2020-08-19 04:31:34,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2020-08-19 04:31:34,602 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:31:34,602 INFO L422 BasicCegarLoop]: trace histogram [56, 56, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:31:34,602 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56 [2020-08-19 04:31:34,602 INFO L427 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:31:34,603 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:31:34,603 INFO L82 PathProgramCache]: Analyzing trace with hash 960883085, now seen corresponding path program 56 times [2020-08-19 04:31:34,603 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:31:34,603 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1534969849] [2020-08-19 04:31:34,603 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:31:34,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:36,474 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:31:36,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:36,488 INFO L134 CoverageAnalysis]: Checked inductivity of 3136 backedges. 0 proven. 3136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:31:36,488 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1534969849] [2020-08-19 04:31:36,489 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:31:36,489 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60] total 60 [2020-08-19 04:31:36,489 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [499197379] [2020-08-19 04:31:36,489 INFO L459 AbstractCegarLoop]: Interpolant automaton has 60 states [2020-08-19 04:31:36,489 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:31:36,490 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2020-08-19 04:31:36,490 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1713, Invalid=1827, Unknown=0, NotChecked=0, Total=3540 [2020-08-19 04:31:36,490 INFO L87 Difference]: Start difference. First operand 125 states and 125 transitions. Second operand 60 states. [2020-08-19 04:31:36,876 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:31:36,877 INFO L93 Difference]: Finished difference Result 134 states and 134 transitions. [2020-08-19 04:31:36,877 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2020-08-19 04:31:36,877 INFO L78 Accepts]: Start accepts. Automaton has 60 states. Word has length 124 [2020-08-19 04:31:36,878 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:31:36,879 INFO L225 Difference]: With dead ends: 134 [2020-08-19 04:31:36,879 INFO L226 Difference]: Without dead ends: 128 [2020-08-19 04:31:36,879 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1713, Invalid=1827, Unknown=0, NotChecked=0, Total=3540 [2020-08-19 04:31:36,880 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2020-08-19 04:31:36,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 127. [2020-08-19 04:31:36,883 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 127 states. [2020-08-19 04:31:36,884 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 127 transitions. [2020-08-19 04:31:36,884 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 127 transitions. Word has length 124 [2020-08-19 04:31:36,884 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:31:36,884 INFO L479 AbstractCegarLoop]: Abstraction has 127 states and 127 transitions. [2020-08-19 04:31:36,885 INFO L480 AbstractCegarLoop]: Interpolant automaton has 60 states. [2020-08-19 04:31:36,885 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 127 transitions. [2020-08-19 04:31:36,885 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2020-08-19 04:31:36,885 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:31:36,885 INFO L422 BasicCegarLoop]: trace histogram [57, 57, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:31:36,886 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable57 [2020-08-19 04:31:36,886 INFO L427 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:31:36,886 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:31:36,886 INFO L82 PathProgramCache]: Analyzing trace with hash -850045649, now seen corresponding path program 57 times [2020-08-19 04:31:36,886 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:31:36,886 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1450233972] [2020-08-19 04:31:36,887 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:31:36,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:38,901 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 04:31:38,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 04:31:38,915 INFO L134 CoverageAnalysis]: Checked inductivity of 3249 backedges. 0 proven. 3249 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 04:31:38,916 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1450233972] [2020-08-19 04:31:38,916 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 04:31:38,916 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [61] total 61 [2020-08-19 04:31:38,916 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1177865485] [2020-08-19 04:31:38,916 INFO L459 AbstractCegarLoop]: Interpolant automaton has 61 states [2020-08-19 04:31:38,917 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 04:31:38,917 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2020-08-19 04:31:38,917 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1772, Invalid=1888, Unknown=0, NotChecked=0, Total=3660 [2020-08-19 04:31:38,917 INFO L87 Difference]: Start difference. First operand 127 states and 127 transitions. Second operand 61 states. [2020-08-19 04:31:39,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 04:31:39,171 INFO L93 Difference]: Finished difference Result 136 states and 136 transitions. [2020-08-19 04:31:39,171 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2020-08-19 04:31:39,172 INFO L78 Accepts]: Start accepts. Automaton has 61 states. Word has length 126 [2020-08-19 04:31:39,172 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 04:31:39,172 INFO L225 Difference]: With dead ends: 136 [2020-08-19 04:31:39,172 INFO L226 Difference]: Without dead ends: 130 [2020-08-19 04:31:39,173 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1772, Invalid=1888, Unknown=0, NotChecked=0, Total=3660 [2020-08-19 04:31:39,173 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2020-08-19 04:31:39,175 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 129. [2020-08-19 04:31:39,175 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 129 states. [2020-08-19 04:31:39,176 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 129 transitions. [2020-08-19 04:31:39,176 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 129 transitions. Word has length 126 [2020-08-19 04:31:39,176 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 04:31:39,176 INFO L479 AbstractCegarLoop]: Abstraction has 129 states and 129 transitions. [2020-08-19 04:31:39,176 INFO L480 AbstractCegarLoop]: Interpolant automaton has 61 states. [2020-08-19 04:31:39,176 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 129 transitions. [2020-08-19 04:31:39,177 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2020-08-19 04:31:39,177 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 04:31:39,177 INFO L422 BasicCegarLoop]: trace histogram [58, 58, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 04:31:39,177 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable58 [2020-08-19 04:31:39,178 INFO L427 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 04:31:39,178 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 04:31:39,178 INFO L82 PathProgramCache]: Analyzing trace with hash -1690804143, now seen corresponding path program 58 times [2020-08-19 04:31:39,178 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 04:31:39,178 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [967013514] [2020-08-19 04:31:39,178 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 04:31:39,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat